replace all "function foo" with "foo()"

Use only labels for partition matching
change shebang line
2022-06-23 19:20:47 +02:00 · 2022-06-23 19:13:07 +02:00 · 2022-06-23 16:23:38 +02:00 · 2022-06-20 13:08:29 +02:00 · 2022-06-06 16:45:07 +02:00 · 2022-06-01 17:55:48 +02:00
15 changed files with 3285 additions and 824 deletions
--- a/.gitignore
+++ b/.gitignore
@@ -0,0 +1,9 @@
+/.ccls-cache/
+/*.c
+/*.sh
+/COPYING.*
+/license-*
+/test/
+/todo/
+/c/lib/
+/c/obj/
--- a/bash/COPYING
+++ b/bash/COPYING
--- a/bash/dup-live-disk.sh
+++ b/bash/dup-live-disk.sh
@@ -1,15 +1,15 @@
-#!/bin/bash
+#!/usr/bin/env bash
 #
 # dup-live-disk.sh - duplicate (possibly live) system partitions
 #
-# (C) Bruno Raoult ("br"), 2007-2021
-# Licensed under the Mozilla Public License (MPL) version 2.0.
+# (C) Bruno Raoult ("br"), 2007-2022
+# Licensed under the GNU General Public License v3.0 or later.
 # Some rights reserved. See COPYING.
 #
-# You should have received a copy of the Mozilla Public License along with this
-# program.  If not, see <https://www.mozilla.org/en-US/MPL>
+# You should have received a copy of the GNU General Public License along with this
+# program. If not, see <https://www.gnu.org/licenses/gpl-3.0-standalone.html>.
 #
-# SPDX-License-Identifier: MPL-2.0 <https://spdx.org/licenses/MPL-2.0.html>
+# SPDX-License-Identifier: GPL-3.0-or-later <https://spdx.org/licenses/GPL-3.0-or-later.html>
 #
 #%MAN_BEGIN%
 # NAME
@@ -37,16 +37,27 @@
 #
 #       -c, --copy=ACTION
 #          ACTION can be 'yes' (all eligible partitions will be copied), 'no'
-#          (no partition will be copied), or 'ask' (will ask for all eligible
-#          partitions). Default is 'no'.
+#          (no partition will be copied), or 'ask'. Default is 'Ask'.
+#          See ACTIONS below.
 #
 #       -d, --dry-run
-#          Dry-run: nothing will be really be done.
+#          Dry-run: nothing will be really be written to disk. This option
+#          0verrides any of '--yes', '--copy', '--fstab', '--grub', and
+#          '--mariadb' options.
 #
-#       -g, --grub
-#          Install grub on destination disk.
-#          Warning: Only works if root partition contains all necessary for
-#          grub: /boot, /usr, etc...
+#       -f, --fstab=ACTION
+#          ACTION ('yes', 'no', or 'ask') defines whether fstab should be
+#          adjusted on destination root partition. Default is 'ask'.
+#          /etc/fstab/LABEL must exist on source root partition. LABEL is the
+#          partition LABEL of destination root disk.
+#          See ACTIONS below.
+#
+#       -g, --grub=ACTION
+#          ACTION ('yes', 'no', 'ask') defines if grub should be installed on
+#          destination disk). Default is 'ask'.
+#          Warning: Only works if root partition contains all necessary files
+#          for grub: /boot, /usr, etc...
+#          See ACTIONS below.
 #
 #       -h, --help
 #          Display short help and exit.
@@ -54,20 +65,75 @@
 #       -m, --man
 #          Display a "man-like" description and exit.
 #
-#       --mariadb
-#          Stop mysql/mariadb before effective copies, restart after.
+#       -M, --mariadb=ACTION
+#          ACTION may be 'yes', 'no', or 'ask', which indicates whether mysql
+#          or mariadb should be stopped before effective partition copies, and
+#          restarted after.
+#          See ACTIONS below.
+#
+#       -n, --no
+#          Will answer 'no' to any question asked to user.
 #
 #       -r, --root=PARTNUM
 #          Mandatory if SRC is provided, forbidden otherwise.
 #          PARTNUM is root partition number on SRC disk.
 #
+#       -y, --yes
+#          Will answer 'yes' to any question asked to user.
+#
+# ACTIONS
+#       Before writing anything, of if something unexpected happens, the
+#       program may ask to proceed. User may answer 'yes', 'no', or 'quit'.
+#       Options --yes, and --no will default respectively to 'yes' and 'no',
+#       default is to ask.
+#       Options '--copy', '--fstab', and '--grub' (which can take the values
+#       'yes', 'no', and 'ask') can override the specific action for copying
+#       partitions, adjusting destination fstab file, and
+#       installing grub on destination disk.
+#
 # EXAMPLES
-#       Copy sda to sdb, root partition is partition (sda1/sdb1)
+#       Copy sda to sdb, root partition is partition 1 (sda1/sdb1) on both
+#       disks. The user will be asked for any action (partition copy, grub,
+#       etc...)
 #       $ sudo dup-live-disk.sh --root 1 sda sdb
 #
-#       Copy live system (where / is mounted) to sdb
+#       Copy live disk (all partitions of current / partition disk) to sdb.
+#       The user will be asked for any action (partition copy, grub, etc...)
 #       $ sudo dup-live-disk.sh sdb
 #
+#       Copy live disk (all partitions of current / partition disk) to sdb.
+#       All valid partitions will be copied, and grub installed on sdb.
+#       $ sudo dup-live-disk.sh --yes sdb
+#
+#       Do not copy partitions, only install grub on sdb.
+#       $ sudo ./dup-live-disk.sh --copy=no --grub=yes sdb
+#       or
+#       $ sudo ./dup-live-disk.sh --no --grub=yes sdb
+#
+# AUTOFS
+#       This script relies on autofs to mount partitions according to partitions
+#       LABELS. See autofs(5) and auto.master(5) for more details.
+#       For example, the following will mount partitions withs LABELS 'root1',
+#       'root2' in /mnt/hd/root1 and /mnt/hd/root2, simply when we try to access
+#       the directories (for example with 'ls /mnt/hd/root1') :
+#
+#       # in file /etc/auto.master
+#       /mnt/hd   /etc/auto.hd              --timeout 60 --ghost
+#
+#       # in file /etc/auto.hd
+#       *         -fstype=auto,defaults     :LABEL=&
+#
+#       This script uses /mnt as default autofs directory. In fact, /mnt contains
+#       symbolic links to different disk labels :
+#
+#       $ ls -l /mnt/root?
+#       lrwxrwxrwx 1 root root 8 Oct 10  2020 /mnt/root1 -> hd/root1/
+#       lrwxrwxrwx 1 root root 8 May 25  2018 /mnt/root2 -> hd/root2/
+#
+#       It means that accessing /mnt/root1 will automagically mount /mnt/hd/root1.
+#       With the maps above, and without the /mnt symlinks, it is possible to
+#       use '--autofs=/mnt/hd' to directly use the automounter map.
+#
 # BUGS
 #       * Cannot generate grub with a separate /boot partition.
 #       * This script will not work for all situations, I strongly suggest you
@@ -75,7 +141,6 @@
 #       * Extended attributes are not preserved (easy fix, but I cannot test)
 #
 # TODO
-#       * Write about autofs configuration.
 #       * Log levels
 #%MAN_END%

@@ -87,51 +152,37 @@ CMD="${0##*/}"
 # shellcheck disable=2034
 VALIDFS=(ext3 ext4 btrfs vfat reiserfs xfs zfs)

-function man {
-    sed -n '/^#%MAN_BEGIN%/,/^#%MAN_END%$/{//!s/^#[ ]\{0,1\}//p}' "$SCRIPT"
+man() {
+    sed -n '/^#%MAN_BEGIN%/,/^#%MAN_END%$/{//!s/^#[ ]\{0,1\}//p}' "$SCRIPT" | more
 }

-function usage {
+usage() {
    cat <<_EOF
 Usage: $CMD [OPTIONS] [SRC] DST
 Duplicate SRC (or live system) disk partitions to DST disk partitions.

 Options:
-      -a, --autofs=DIR     autofs "LABEL-based" directory. Default is '/mnt'.
-      -c, --copy=ACTION    do partitions copies ('yes'), do not copy then ('no')
-                           or ask for each of them ('ask'). Default is 'no'.
+      -a, --autofs=DIR     autofs 'LABEL-based' directory. Default is '/mnt'.
+      -c, --copy=ACTION    do partitions copies (ACTION='yes', 'no', 'ask).
+                           Default is 'ask'
      -d, --dry-run        dry-run: nothing will be written to disk
-      -g, --grub           install grub on destination disk
+      -f, --fstab=ACTION   adjust fstab on destination disk ('yes', 'no',
+                           'ask'). Default is 'ask'
+      -g, --grub=ACTION    install grub on destination disk ('yes', 'no',
+                           'ask'). Default is 'ask'
      -h, --help           this help
      -m, --man            display a "man-like" page and exit
-      --mariadb            stop and restart mysql/mariadb server before and
-                           after copies
+      -M, --mariadb=ACTION stop and restart mysql/mariadb server before and
+                           after copies ('yes', 'no', 'ask'). Default is 'ask'
+      -n, --no             Will answer 'no' to any question
      -r, --root=PARTNUM   root partition number on SRC device
                           mandatory if and only if SRC is provided
+      -y, --yes            Will answer 'yes' to any question

 SRC and DST have strong constraints on partitions schemes and naming.
-Type '$CMD --man" for more details"
+Type '$CMD --man' for more details
 _EOF
-    exit 0
-}
-
-# mariadb start/stop
-function mariadb_maybe_stop {
-    if [[ $MARIADB == yes ]] && systemctl is-active --quiet mysql; then
-        #log -n "stopping mariadb/mysql... "
-        echorun systemctl stop mariadb
-        # bug if script stops here
-        MARIADBSTOPPED=yes
-        #log "done."
-    fi
-}
-function mariadb_maybe_start {
-    if [[ $MARIADB == yes && $MARIADBSTOPPED == yes ]]; then
-        #log -n "restarting mariadb/mysql... "
-        echorun systemctl start mariadb
-        MARIADBSTOPPED=no
-        #log "done."
-    fi
+    return 0
 }

 # log function
@@ -139,7 +190,7 @@ function mariadb_maybe_start {
 # -l, -s: long, or short prefix (default: none). Last one is used.
 # -t: timestamp
 # -n: no newline
-function log {
+log() {
    local timestr="" prefix="" opt=y newline=y
    while [[ $opt = y ]]; do
        case $1 in
@@ -159,24 +210,81 @@ function log {
    return 0
 }

-# prints out and run a command.
-function echorun {
+# prints out and run (maybe) a command.
+echorun_maybe() {
    if [[ "$DRYRUN" == 'yes' ]]; then
-        log "%s " "dry-run: " "$@"
+        log "dry-run: %s" "$*"
    else
-        log "%s " "$@"
+        log "%s" "$*"
        "$@"
    fi
 }

-function error_handler {
+yesno() {
+    local reason answer
+
+    # shellcheck disable=SC2059
+    printf -v reason "*** $1 [y/n/q] ? " "${@:2}"
+
+    while true; do
+        if [[ $YESNO =~ ^(yes|no)$ ]]; then
+            answer="$YESNO"
+            # shellcheck disable=SC2059
+            printf "$reason%s\n" "$answer"
+        else
+            read -p "$reason" -r answer
+        fi
+        case "${answer,,}" in
+            y|yes) return 0
+                   ;;
+            n|no) return 1
+                  ;;
+            q|quit) printf "Aborting...\n"
+                    exit 1
+        esac
+    done
+}
+
+# mariadb start/stop
+mariadb_maybe_stop() {
+    [[ $MARIADBSTOPPED == yes ]] && return 0
+    if systemctl is-active --quiet mysql; then
+        if [[ $MARIADB == ask ]]; then
+            if yesno "Stop MariaDB/MySQL"; then
+               MARIADB=yes
+            else
+               MARIADB=no
+            fi
+        fi
+        if [[ $MARIADB == no ]]; then
+            log "Warning: MariaDB/MySQL is running, database corruption possible on DEST disk."
+            return 0
+        fi
+        echorun_maybe systemctl stop mariadb
+        # bug if script stops here
+        MARIADBSTOPPED=yes
+    else
+        log "MariaDB/MySQL is inactive."
+    fi
+}
+
+mariadb_maybe_start() {
+    if [[ $MARIADB == yes && $MARIADBSTOPPED == yes ]]; then
+        #log -n "restarting mariadb/mysql... "
+        echorun_maybe systemctl start mariadb
+        MARIADBSTOPPED=no
+        #log "done."
+    fi
+}
+
+error_handler() {
    local ERROR=$2
    log "FATAL: Error line $1, exit code $2. Aborting."
    exit "$ERROR"
 }
 trap 'error_handler $LINENO $?' ERR SIGHUP SIGINT SIGTERM

-function exit_handler {
+exit_handler() {
    local mnt

    # log "exit handler (at line $1)"
@@ -184,15 +292,21 @@ function exit_handler {
    if [[ -n "$DSTMNT" ]] && mountpoint -q "$DSTMNT"; then
        for mnt in "$DSTMNT"/{dev,proc,sys}; do
            if mountpoint -q "$mnt"; then
-                echorun umount "$mnt"
+                # https://unix.stackexchange.com/questions/693346
+                if ! echorun_maybe umount "$mnt"; then
+                    echorun_maybe umount --lazy "$mnt"
+                fi
            fi
        done
    fi
 }
-
 trap 'exit_handler $LINENO' EXIT

-function check_block_device {
+# check_block_device - check a file system device
+# $1: device description
+# $2: more ('w' for writable)
+# $3: device
+check_block_device() {
    local devtype="$1"
    local mode="$2"
    local dev="$3"
@@ -212,27 +326,37 @@ function check_block_device {
    return 0
 }

-# check that /etc/fstab.XXX exists in SRCR
-function check_fstab {
-    local fstab
-    for f in "$SRCROOTLABEL" "$DSTROOTLABEL"; do
-        fstab="${AUTOFS_DIR}/$SRCROOTLABEL/etc/fstab.$f"
-        #log -n "======= check %s=%s " "$fstab" "$f"
-        if [[ ! -f "$fstab" ]]; then
-            log "Fatal: source or destination fstab (%s) not found" "$fstab"
-            return 1
-        fi
-    done
+# check that /etc/fstab.DESTLABEL exists in SRC disk.
+check_fstab() {
+    local etc="${AUTOFS_DIR}/$SRCROOTLABEL/etc"
+    local fstab="fstab.$DSTROOTLABEL"
+    #if [[ "$FSTAB" != no ]]; then
+    if [[ ! -f "$etc/$fstab" ]]; then
+        FSTAB=no
+        log "Warning: No target fstab (%s) on SRC disk" "$etc/$fstab"
+    else
+        log "Info: Found target fstab (%s) in SRC root partition (%s)." "$fstab" "$etc"
+    fi
    return 0
 }

-function fix_fstab {
+fix_fstab() {
    local fstab="${AUTOFS_DIR}/$DSTROOTLABEL/etc/fstab"
-    echorun ln -f "$fstab.$DSTROOTLABEL" "$fstab"
+
+    #[[ ! -f "$fstab" ]] && log "Warning: DST fstab will be wrong !" && FSTAB=no
+    if [[ "$FSTAB" == ask ]]; then
+        yesno "Link %s to %s" "$fstab.$DSTROOTLABEL" "$fstab" && FSTAB=yes || FSTAB=no
+    fi
+    if [[ "$FSTAB" == no ]]; then
+        log "Warning: DST fstab will be *wrong*, boot is compromised"
+    else
+        echorun_maybe ln -f "$fstab.$DSTROOTLABEL" "$fstab"
+    fi
+    return 0
 }

 # check if $1 is in array $2 ($2 is by reference)
-function in_array {
+in_array() {
    local elt=$1 i
    local -n arr=$2
    for ((i=0; i<${#arr[@]}; ++i)); do
@@ -241,45 +365,25 @@ function in_array {
    return 1
 }

-# get y/n/q user input
-function yesno {
-    local input
-    while true; do
-        printf "%s " "$1"
-        read -r input
-        case "$input" in
-            y|Y)
-                return 0
-                ;;
-            q|Q)
-                log "aborting..."
-                exit 0
-                ;;
-            n|N)
-                return 1
-                ;;
-            *)
-                printf "invalid answer. "
-        esac
-    done
-}
-
 # source and destination devices, root partition
 SRC=""
 DST=""
 SRCROOT=""
-ROOTPARTNUM=""
+SRCROOTPARTNUM=""
 AUTOFS_DIR=/mnt

 DRYRUN=no                                         # dry-run
-GRUB=no                                           # install grub
-COPY=no                                           # do FS copies
-MARIADB=no                                        # stop/start mysql/mariadb
+FSTAB=ask                                         # adjust fstab
+GRUB=ask                                          # install grub
+COPY=ask                                          # do FS copies
+MARIADB=ask                                       # stop/start mysql/mariadb
 MARIADBSTOPPED=no                                 # mysql stopped ?
+YESNO=                                            # default answer
+ROOTCOPIED=no                                     # was root partition copied ?

 # short and long options
-SOPTS="a:c:dghmr:"
-LOPTS="autofs:,copy:,dry-run,grub,help,man,mariadb,root:"
+SOPTS="a:c:df:g:hmM:nr:y"
+LOPTS="autofs:,copy:,dry-run,fstab:,grub:,help,man,mariadb:,no,root:,yes"

 if ! TMP=$(getopt -o "$SOPTS" -l "$LOPTS" -n "$CMD" -- "$@"); then
    log "Use '$CMD --help' or '$CMD --man' for help."
@@ -296,7 +400,7 @@ while true; do
            shift
            ;;
        '-c'|'--copy')
-            case "$2" in
+            case "${2,,}" in
                "no") COPY=no;;
                "yes") COPY=yes;;
                "ask") COPY=ask;;
@@ -309,8 +413,27 @@ while true; do
        '-d'|'--dry-run')
            DRYRUN=yes
            ;;
+        '-f'|'--fstab')
+            case "${2,,}" in
+                "no") FSTAB=no;;
+                "yes") FSTAB=yes;;
+                "ask") FSTAB=ask;;
+                *) log "invalid '$2' --fstab flag"
+                   usage
+                   exit 1
+            esac
+            shift
+            ;;
        '-g'|'--grub')
-            GRUB=yes
+            case "${2,,}" in
+                "no") GRUB=no;;
+                "yes") GRUB=yes;;
+                "ask") GRUB=ask;;
+                *) log "invalid '$2' --grub flag"
+                   usage
+                   exit 1
+            esac
+            shift
            ;;
        '-h'|'--help')
            usage
@@ -320,13 +443,24 @@ while true; do
            man
            exit 0
            ;;
-        '--mariadb')
-            MARIADB=yes
+        '-n'|'--no')
+            YESNO=no
+            ;;
+        '-M'|'--mariadb')
+            case "${2,,}" in
+                "no") MARIADB=no;;
+                "yes") MARIADB=yes;;
+                "ask") MARIADB=ask;;
+                *) log "invalid '$2' --mariadb flag"
+                   usage
+                   exit 1
+            esac
+            shift
            ;;
        '-r'|'--root')
-            ROOTPARTNUM="$2"
-            if ! [[ "$ROOTPARTNUM" =~ ^[[:digit:]]+$ ]]; then
-                log "$CMD: $ROOTPARTNUM must be a partition number."
+            SRCROOTPARTNUM="$2"
+            if ! [[ "$SRCROOTPARTNUM" =~ ^[[:digit:]]+$ ]]; then
+                log "$CMD: $SRCROOTPARTNUM must be a partition number."
                exit 1
            fi
            shift
@@ -335,6 +469,9 @@ while true; do
            shift
            break
            ;;
+        '-y'|'--yes')
+            YESNO=yes
+            ;;
        *)
            usage
            log 'Internal error!'
@@ -344,29 +481,40 @@ while true; do
    shift
 done

+# check if current user is root
+if (( EUID != 0 )); then
+    log "This script must be run as root... Aborting."
+    exit 1
+fi
+
 case "$#" in
    1)
-        if [[ -n "$ROOTPARTNUM" ]]; then
+        if [[ -n "$SRCROOTPARTNUM" ]]; then
            log "$CMD: cannot have --root option for live system."
            log "Use '$CMD --help' or '$CMD --man' for help."
            exit 1
        fi
        # guess root partition disk name
        SRCROOT=$(findmnt -no SOURCE -M /)
-        ROOTPARTNUM=${SRCROOT: -1}
+        SRCROOTPARTNUM=${SRCROOT: -1}
        SRC="/dev/"$(lsblk -no pkname "$SRCROOT")
        DST="/dev/$1"
        ;;
    2)
-        if [[ -z "$ROOTPARTNUM" ]]; then
+        if [[ -z "$SRCROOTPARTNUM" ]]; then
            log "$CMD: missing --root option for non live system."
            log "Use '$CMD --help' or '$CMD --man' for help."
            exit 1
        fi
        SRC="/dev/$1"
-        SRCROOT="$SRC$ROOTPARTNUM"
+        SRCROOT="$SRC$SRCROOTPARTNUM"
        DST="/dev/$2"
        ;;
+    0)
+        log "Missing destination disk."
+        usage
+        exit 1
+        ;;
    *)
        usage
        exit 1
@@ -374,7 +522,7 @@ esac

 # check SRC and DST are different, find out their characteristics
 if [[ "$SRC" = "$DST" ]]; then
-    log "%s: Fatal: destination disk (%s) cannot be source.\n" "$CMD" "$SRC"
+    log "Fatal: destination and source disk are identical (%s)" "$SRC"
    log "Use '%s --help' or '%s --man' for help." "$CMD" "$CMD"
    exit 1
 fi
@@ -383,8 +531,8 @@ check_block_device "destination disk" w "$DST"
 check_block_device "source root partition" r "$SRCROOT"

 SRCROOTLABEL=$(lsblk -no label "$SRCROOT")
-SRCCHAR=${SRCROOTLABEL: -1}
-ROOTLABEL=${SRCROOTLABEL:0:-1}
+# strip out last character
+ROOTLABEL=${SRCROOTLABEL%%?}

 # find out all partitions labels on SRC disk...
 # shellcheck disable=SC2207
@@ -394,9 +542,9 @@ declare -a LABELS=(${SRCLABELS[@]%?})

 # ... and corresponding partition device and fstype
 declare -a SRCDEVS SRCFS SRC_VALID_FS
-for ((i=0; i<${#LABELS[@]}; ++i)); do
-    TMP="${LABELS[$i]}$SRCCHAR"
+for ((i=0; i<${#SRCLABELS[@]}; ++i)); do
    TMP="${SRCLABELS[$i]}"
+    #log "TMP=%s" "$TMP"
    TMPDEV=$(findfs LABEL="$TMP")
    TMPFS=$(lsblk -no fstype "$TMPDEV")
    log "found LABEL=$TMP DEV=$TMPDEV FSTYPE=$TMPFS"
@@ -407,28 +555,33 @@ for ((i=0; i<${#LABELS[@]}; ++i)); do
    unset TMP TMPDEV TMPFS
 done

-DSTROOT="$DST$ROOTPARTNUM"
-check_block_device "destination root partition" w "$DSTROOT"
-DSTROOTLABEL=$(lsblk -no label "$DSTROOT")
-DSTCHAR=${DSTROOTLABEL: -1}
+# find out DST root partition
+# shellcheck disable=SC2207
+declare -a TMP_DSTLABELS=($(lsblk -lno  LABEL "$DST"))

-# check DSTROOTLABEL is compatible with ROOTLABEL
-if [[ "$DSTROOTLABEL" != "$ROOTLABEL$DSTCHAR" ]]; then
-    log "%s: Fatal: %s != %s%s." "$CMD" "$DSTROOTLABEL" "$ROOTLABEL" "$DSTCHAR"
-    exit 1
-fi
+for maybe_root in "${TMP_DSTLABELS[@]}"; do
+    log "rootlabel=%s maybe=%s" "$ROOTLABEL" "$maybe_root"
+    if [[ $maybe_root =~ ^${ROOTLABEL}.$ ]]; then
+        log "Found destination root label: $maybe_root"
+        DSTROOTLABEL=$maybe_root
+        DSTCHAR=${DSTROOTLABEL: -1}
+        DSTROOT=$(findfs LABEL="$DSTROOTLABEL")
+        check_block_device "destination root partition" w "$DSTROOT"
+        break
+    fi
+done

 declare -a DSTLABELS DSTDEVS DSTFS DST_VALID_FS
 # Do the same for corresponding DST partitions labels, device, and fstype
 for ((i=0; i<${#LABELS[@]}; ++i)); do
    TMP="${LABELS[$i]}$DSTCHAR"
-    log -n "Looking for [%s] label... " "$TMP"
+    log -n "Looking for [%s] label : " "$TMP"
    if ! TMPDEV=$(findfs LABEL="$TMP"); then
        log "not found."
        exit 1
    fi
    TMPDISK=${TMPDEV%?}
-    log -n "DEV=%s... DISK=%s..." "$TMPDEV" "$TMPDISK"
+    log -n "DEV=%s DISK=%s " "$TMPDEV" "$TMPDISK"
    if [[ "$TMPDISK" != "$DST" ]]; then
        log "wrong disk (%s != %s)" "$TMPDISK" "$DST"
        exit 1
@@ -443,56 +596,80 @@ for ((i=0; i<${#LABELS[@]}; ++i)); do
    unset TMP TMPDEV TMPFS
 done

-for ((i=0; i<${#LABELS[@]}; ++i)); do
-    log -n "%s %s " "${SRCDEVS[$i]}" "${DSTDEVS[$i]}"
-    log -n "%s %s " "${SRCLABELS[$i]}" "${DSTLABELS[$i]}"
-    log -n "%s %s "  "${SRCFS[$i]}" "${DSTFS[$i]}"
-    log -n "%s %s "  "${SRC_VALID_FS[$i]}" "${DST_VALID_FS[$i]}"
-    [[ "$DSTROOTLABEL" == "${DSTLABELS[$i]}" ]] && log "*"
-    echo
-done | column -N DEV1,DEV2,LABEL1,LABEL2,FS1,FS2,SVALID\?,DVALID\?,ROOT -t -o " | "
+{
+    printf "DEV1 DEV2 LABEL1 LABEL2 FS1 FS2 SVALID\? DVALID\? ROOT\n"
+    for ((i=0; i<${#LABELS[@]}; ++i)); do
+        log -n "%s %s " "${SRCDEVS[$i]}" "${DSTDEVS[$i]}"
+        log -n "%s %s " "${SRCLABELS[$i]}" "${DSTLABELS[$i]}"
+        log -n "%s %s "  "${SRCFS[$i]}" "${DSTFS[$i]}"
+        log -n "%s %s "  "${SRC_VALID_FS[$i]}" "${DST_VALID_FS[$i]}"
+        [[ "$DSTROOTLABEL" == "${DSTLABELS[$i]}" ]] && log "*"
+        echo
+    done
+} | column -t

 check_fstab || exit 1

-RSYNCOPTS="-axH --delete --delete-excluded"
 FILTER=--filter="dir-merge .rsync-disk-copy"
+declare -a RSYNCOPTS=(-axH "$FILTER" --delete --delete-excluded)
 # copy loop
 for ((i=0; i<${#LABELS[@]}; ++i)); do
    if [[ "${SRC_VALID_FS[$i]}" != y ]] || [[ "${DST_VALID_FS[$i]}" != y ]]; then
        log "skipping label %s" "${LABELS[$i]}"
        continue
    fi
-    SRCPART="${AUTOFS_DIR}/${SRCLABELS[$i]}/"
+    SRCPART="$AUTOFS_DIR/${SRCLABELS[$i]}/"
    DSTPART="$AUTOFS_DIR/${DSTLABELS[$i]}"

    #log -n "%s -> %s : " "$SRCPART" "$DSTPART"
    #log "\t%s %s %s %s %s" rsync "${RSYNCOPTS}" "$FILTER" "$SRCPART" "$DSTPART"
    copy="$COPY"
    if [[ "$COPY" == 'ask' ]]; then
-        yesno "Copy $SRCPART to $DSTPART ? [y/n/q]" && copy=yes || copy=no
+        yesno "Copy $SRCPART to $DSTPART" && copy=yes || copy=no
    fi
    if [[ "$copy" == yes ]]; then
        mariadb_maybe_stop
+        status=0
        # shellcheck disable=SC2086
-        echorun rsync "$FILTER" ${RSYNCOPTS} "$SRCPART" "$DSTPART"
+        echorun_maybe rsync "${RSYNCOPTS[@]}" "$SRCPART" "$DSTPART" || status=$?
+        log -s "rsync status=%s\n" "$status"
+        if (( status != 24 && status != 0 )); then
+            log -s "rsync error %d" "$status"
+            exit 1
+        fi
+
        if [[ "$DSTROOTLABEL" == "${DSTLABELS[$i]}" ]]; then
+            ROOTCOPIED=yes
            fix_fstab
        fi
    fi
    #log ""
 done
+mariadb_maybe_start

 # grub install
-if [[ "$GRUB" == yes ]]; then
+if [[ $GRUB == ask ]]; then
+    if ! yesno "install grub on %s (root label: %s)" "$DST" "$DSTROOTLABEL"; then
+        GRUB=no
+    fi
+fi
+if [[ $GRUB == no ]]; then
+    if [[ $ROOTCOPIED == yes ]]; then
+        log "Warning: root filesystem changed, and skipping grub install on %s, boot will probably fail." "$DST"
+    else
+        log "Warning: Skipping grub install on %s." "$DST"
+    fi
+else
    log "installing grub on $DST..."
+
    DSTMNT="$AUTOFS_DIR/$DSTROOTLABEL"
    # mount virtual devices
-    echorun mount -o bind /sys  "$DSTMNT/sys"
-    echorun mount -o bind /proc "$DSTMNT/proc"
-    echorun mount -o bind /dev  "$DSTMNT/dev"
+    echorun_maybe mount -o bind /sys  "$DSTMNT/sys"
+    echorun_maybe mount -o bind /proc "$DSTMNT/proc"
+    echorun_maybe mount -o bind /dev  "$DSTMNT/dev"

-    echorun chroot "$DSTMNT" update-grub
-    echorun chroot "$DSTMNT" grub-install "$DST"
+    echorun_maybe chroot "$DSTMNT" update-grub
+    echorun_maybe chroot "$DSTMNT" grub-install "$DST"
 fi

 exit 0
--- a/bash/sync-conf-example.sh
+++ b/bash/sync-conf-example.sh
@@ -1,73 +1,89 @@
-#!/bin/bash
+#!/usr/bin/env bash
 #
 # sync-conf-example.sh - a "sync.sh" configuration file example.
 #
-# (C) Bruno Raoult ("br"), 2007-2021
-# Licensed under the Mozilla Public License (MPL) version 2.0.
+# (C) Bruno Raoult ("br"), 2007-2022
+# Licensed under the GNU General Public License v3.0 or later.
 # Some rights reserved. See COPYING.
 #
-# You should have received a copy of the Mozilla Public License along with this
-# program.  If not, see <https://www.mozilla.org/en-US/MPL>
+# You should have received a copy of the GNU General Public License along with this
+# program. If not, see <https://www.gnu.org/licenses/gpl-3.0-standalone.html>.
 #
-# SPDX-License-Identifier: MPL-2.0 <https://spdx.org/licenses/MPL-2.0.html>
+# SPDX-License-Identifier: GPL-3.0-or-later <https://spdx.org/licenses/GPL-3.0-or-later.html>
 #
 # USAGE:
 #    sync.sh -rfu /path/to/sync-conf-example.sh

-# full source path
-SOURCEDIR=/example-srcdir
-# server name. Could also be user@hostname
-SERVER=backuphost
-# full destination path on target machine (or relative to home directory)
-DESTDIR=/mnt/array3+4/example-destdir
+# below, default values are just below the lines starting with '######'.
+# The only mandatory ones are SOURCEDIR, SERVER, and DESTDIR.

-# backups to keep
-NYEARS=2
-NMONTHS=12
-NWEEKS=4
-NDAYS=7
+###### source directory full path, destination server and path.
+###### SERVER could user@host, or "local" if local machine
+# SOURCEDIR=""
+# SERVER=""
+# DESTDIR=""
+export SOURCEDIR=/example-srcdir
+export SERVER=root@backuphost
+export DESTDIR=/mnt/nas1/example-destdir

-# FILTER can be used to filter directories to include/exclude. See rsync(1) for
-# details.
-FILTER=--filter="dir-merge .rsync-filter-br"
+###### backups to keep
+# NYEARS=3
+# NMONTHS=12
+# NWEEKS=6
+# NDAYS=10

-# other rsync options
-RSYNCOPTS=""
+###### other rsync options. It must be an array.
+# RSYNCOPTS=()
+FILTERNAME=".rsync-filter-system"
+FILTER=--filter="dir-merge ${FILTERNAME}"
+RSYNCOPTS+=("$FILTER")

-# functions run just before and after the rsync. Could be useful to create
-# database dumps, etc...
-# Warning: avoid using "cd", or be sure to come back to current dir
-# before returning from functions
+###### functions run immediately before and after the rsync. Can be used
+###### to create database dumps, etc...
+###### Warning: avoid using "cd", or be sure to come back to current dir
+###### before returning from functions
+# beforesync() { log "calling default beforesync..."; }
+# aftersync()  { log "calling default aftersync...";  }

-# example below will create a dump
-function beforesync() {
-    # next line may be removed if you do something. bash does not like empty
-    # functions
-    :
+# example below will create a mysql/mariadb dump. At same time we create
+# a FILTERNAME file in database data directory to exclude databases directories
+# themselves.
+beforesync() {
+    local -a databases
+    local datadir

    # log is a sync.sh function.
    log -s -t "calling user beforesync: mysql databases dumps..."

-    datadir=$(mysql -sN -u root -e 'select @@datadir')
-    # log "mysql datadir=${datadir}"
+    if ! datadir="$(mysql -sN -u root -e 'select @@datadir')"; then
+        log -s "cannot get maria databases directory"
+        exit 1
+    fi
    rm -f "$datadir/$FILTERNAME"
-    databases=($(mysql -sN -u root -e "SHOW DATABASES;"))
+    # shellcheck disable=2207
+    if ! databases=( $(mysql -sN -u root -e "SHOW DATABASES;") ); then
+        log -s "cannot get maria databases list"
+        exit 1
+    fi

-    for db in "${databases[@]}"
-    do
-        # exclude database directory itself
-		echo "- /${db}/*" >> "$datadir/$FILTERNAME"
+    for db in "${databases[@]}"; do
+        # do not backup database contents itself
+        printf -- "- /%s/*\n" "$db" >> "$datadir/$FILTERNAME"

-        log -n "${db}... "
+        log -n "$db... "
        case "$db" in
            information_schema|performance_schema)
                log "skipped."
                ;;
            *)
-                log -n "dumping to ${datadir}${db}.sql... "
-                mysqldump --user=root --routines "$db" > "$datadir/$db.sql"
-                # log -n "compressing... "
-                gzip "$datadir/$db.sql"
+                log -n "dumping to $datadir$db.sql... "
+                if ! mysqldump --user=root --single-transaction --routines \
+                     "$db" > "$datadir/$db.sql"; then
+                    log -s "mysqldump error"
+                    exit 1
+                fi
+                log -n "compressing... "
+                gzip -f "$datadir/$db.sql"
                log "done."
        esac
    done
@@ -75,10 +91,12 @@ function beforesync() {
    # cat ${datadir}/${FILTERNAME}
 }

-function aftersync() {
-    # next line may be removed if you do something. bash does not like empty
-    # functions
-    :
+aftersync() {
    # we may remove the dump here...
    log -s -t "calling user aftersync"
 }
+
+# For Emacs, shell-script-mode:
+# Local Variables:
+# mode: shell-script
+# End:
--- a/bash/sync.sh
+++ b/bash/sync.sh
@@ -1,63 +1,81 @@
-#!/bin/bash
+#!/usr/bin/env bash
 #
 # sync.sh - a backup utility using ssh/rsync facilities.
 #
-# (C) Bruno Raoult ("br"), 2007-2021
-# Licensed under the Mozilla Public License (MPL) version 2.0.
+# (C) Bruno Raoult ("br"), 2007-2022
+# Licensed under the GNU General Public License v3.0 or later.
 # Some rights reserved. See COPYING.
 #
-# You should have received a copy of the Mozilla Public License along with this
-# program.  If not, see <https://www.mozilla.org/en-US/MPL>
+# You should have received a copy of the GNU General Public License along with this
+# program. If not, see <https://www.gnu.org/licenses/gpl-3.0-standalone.html>.
 #
-# SPDX-License-Identifier: MPL-2.0 <https://spdx.org/licenses/MPL-2.0.html>
+# SPDX-License-Identifier: GPL-3.0-or-later <https://spdx.org/licenses/GPL-3.0-or-later.html>
 #
+#%MAN_BEGIN%
 # NAME
 #       sync.sh - a backup utility using ssh/rsync facilities.
 #
 # SYNOPSIS
-#       sync.sh [-ymwdznt] CONFIG
+#       sync.sh [-a PERIOD][-DflmnruvzZ] CONFIG
 #
 # DESCRIPTION
-#       Performs a backup to a local or remote destination, keeping different
+#       Perform a backup to a local or remote destination, keeping different
 #       versions (daily, weekly, monthly, yearly). All options can be set in
 #       CONFIG file, which is mandatory.
+#       The synchronization is make with rsync(1), and only files changed or
+#       modified are actually copied; files which are identical with previous
+#       backup are hard-linked to previous one.
 #
 # OPTIONS
-#       -y, -m, -w, -d
-#          yearly/monthly/weekly/daily backup. If none of these options is set,
-#          and none of the corresponding variables set to "y" in configuration
+#       -a PERIOD
+#          Indicate which backup(s) should be done. PERIOD is a string composed
+#          of one or more of 'y', 'm', 'w', and 'd', indicating respectively
+#          yearly, monthly, weekly and daily backups.
+#          Multiple -a may appear. For example, if we wish to perform a daily,
+#          monthly, and yearly backup, we can use syntax like :
+#              -a m -a y -a d
+#              -adm -ay
+#              -a ymd
+#          If this option is not used, and none of the equivalent variables
+#          (YEARLY, MONTHY, WEEKLY, DAILY) is set to "y" in configuration
 #          file, the script will determine itself what should be done,
 #          depending on the current day or date: daily backup every day,
 #          weekly every sunday, monthly every first day of month, and yearly
 #          every Jan 1st.
-#       -n
-#          do not send mail report (which is the default if MAILTO environment
-#          is set). Practically, this option only unsets MAILTO.
-#       -f
-#          filter some rsync output, such as hard and soft links, dirs, etc.
-#       -r
-#          resume an interrupted transfer (rsync --partial option). It should
-#          be safe to use this option, as it has no effect in usual case.
-#       -z
-#          enable rsync compression. Should be used when the transport is more
-#          expensive than CPU (typically slow connections).
-#       -u
-#          will use numeric IDs (uid and gid) instead of usernames/groupnames.
-#          This could be preferable in case of backup, to avoid any issue when
-#          getting back the file (for instance via a mount).
-#       -v
-#          adds sub-tasks information, with timestamps.
 #       -D
-#          by default, this script will re-route all outputs (stdout and stderr)
+#          By default, this script re-routes all outputs (stdout and stderr)
 #          to a temporary file after basic initialization (mainly options
 #          checks and configuration file evaluation), so that we can format
 #          the output before displaying or mailing it.
 #          This option disables this redirection. It is useful (together with
 #          bash's -x option) when some errors are difficult to track.
+#       -f
+#          Filter some rsync output, such as hard and soft links, dirs, etc.
+#       -l
+#          Keep log file (usually /tmp/sync-log-PID).
+#       -m
+#          Display a "man-like" description and exit.
+#       -n
+#          Do not send mail report (which is the default if MAILTO environment
+#          is set). Practically, this option only unsets MAILTO.
+#       -r
+#          Resume an interrupted transfer (rsync --partial option). It should
+#          be safe to use this option, as it has no effect in usual case.
+#       -u
+#          Use numeric IDs (UID and GID) instead of usernames/groupnames. This
+#          could be preferable in case of backup, to avoid any issue when
+#          getting back the file (for instance via a mount).
+#       -v
+#          Add sub-tasks information, with timestamps. This option is currently
+#          not implemented.
+#       -z
+#          Enable rsync compression. Should be used when the transport is more
+#          expensive than CPU (typically slow connections).
+#       -Z
+#          By default, if gzip utility is available, the email log attachment
+#          is compressed. This option will prevent any compression.
 #
 # GENERAL
-#       Ensure your ssh setup is correct: You must be able to ssh the target
-#       machine without password.
 #       You should avoid modifying variables in this script.
 #       Instead, use the configuration file, whenever possible.
 #
@@ -67,9 +85,31 @@
 #       By default, the output is displayed (or mailed) when the script exits.
 #       The -D option allows to get real-time output.
 #
+# PREREQUISITES
+#       The following must be installed, configured, and within your PATH :
+#       ssh
+#          Ensure your ssh setup is correct: You must be able to ssh the target
+#          machine without password.
+#       sendmail/postfix (or any MTA providing the sendmail command)
+#          Your MTA must be properly configured to send emails. For example
+#          you should receive an email with the following command :
+#             echo "Subject: sendmail test" | sendmail -v youremail@example.com
+#
+#       Additionnaly, you will also need the "base64" and "gzip" utilities.
+#
+#       NOTE: If you run this script via cron(8), please remember that PATH is
+#       different. For example, on some systems, cron's default PATH is
+#       "/usr/bin:/bin". Should sendmail binary be in /usr/sbin on your system,
+#       you will have to change PATH in your crontab.
+#
 # CONFIGURATION FILE
 #       TODO: Write documentation. See example (sync-conf-example.sh).
 #
+# AUTHOR
+#       Bruno Raoult.
+#
+#%MAN_END%
+#
 # BUGS
 #       Many.
 #       This was written for a "terastation" NAS server, which is a kind of
@@ -87,7 +127,6 @@
 #       - replace y/n values with empty/not-empty. A step to avoid config file
 #       - set default compress value on local/non-local. Step to avoid config
 #         file
-#       - replace y/m/w/d with numerical values ? Step to avoid config file
 #       - manage more errors (instead of relying on traps)
 #       - the deletion of oldest backup directories takes ages. This could be
 #         avoided (for example we could move them to a temp dir and remove it
@@ -100,23 +139,21 @@
 #         destination from the previous backup, and perform a usual backup
 #         on this new directory. This should be easy, but my guess is that
 #         it could be slower (1 first pass on server is added before the
-#         normal backup.
-#       - replace getopts(1) to have a better options parsing. GNU's getopt(1)
-#         could be an option, but not available everywhere (for example on
-#         MacOS). Likely impossible to keep this script portable.
-#
-# AUTHOR
-#       Bruno Raoult.
-#
+#         normal backup).
+#       - replace bash's getopts for a better options parsing tool, such as
+#         GNU's getopt(1) could be an option, but not available everywhere
+#         (for example on MacOS). Likely impossible to keep this script portable.
 #

-#########################  options default values.
-# These ones can be set by command-line.
-# They can also be overwritten in configuration file (prefered option).
-YEARLY=n                        # (-y) yearly backup (y/n)
-MONTHLY=n                       # (-m) monthly backup (y/n)
-WEEKLY=n                        # (-w) weekly backup (y/n)
-DAILY=n                         # (-d) daily backup (y/n)
+###############################################################################
+#########################  options default values
+###############################################################################
+# These ones can be set by command-line and in configuration file.
+# priority is given to configuration file.
+YEARLY=n                        # (-ay) yearly backup (y/n)
+MONTHLY=n                       # (-am) monthly backup (y/n)
+WEEKLY=n                        # (-aw) weekly backup (y/n)
+DAILY=n                         # (-ad) daily backup (y/n)
 FILTERLNK=n                     # (-f) rsync logs filter: links, dirs... (y/n)
 RESUME=n                        # (-r) resume backup (y/n)
 COMPRESS=""                     # (-z) rsync compression
@@ -124,129 +161,174 @@ NUMID=""                        # (-u) use numeric IDs
 #VERBOSE=0                       # TODO: (-v) logs level (0/1)
 DEBUG=n                         # (-D) debug: no I/O redirect (y/n)
 MAILTO=${MAILTO:-""}            # (-n) mail recipient. -n sets it to ""
+ZIPMAIL="gzip"                  # (-Z) zip mail attachment
+KEEPLOGFILE=n                   # (-l) keep log file

-# options not available on command line, but settable in config  file.
+# options only settable in config  file.
 NYEARS=3                        # keep # years (int)
 NMONTHS=12                      # keep # months (int)
-NWEEKS=4                        # keep # weeks (int)
-NDAYS=7                         # keep # days (int)
-RSYNCOPTS=""                    # other rsync options
-SOURCEDIR="."                   # source dir
-DESTDIR="."                     # destination dir
+NWEEKS=6                        # keep # weeks (int)
+NDAYS=10                        # keep # days (int)
+declare -a RSYNCOPTS=()         # other rsync options
+SOURCEDIR=""                    # source dir
+SERVER=""                       # backup server
+DESTDIR=""                      # destination dir
 MODIFYWINDOW=1                  # accuracy for mod time comparison

 # these 2 functions can be overwritten in data file, to run specific actions
 # just before and after the actual sync
-function beforesync () {
-    log calling default beforesync...
+beforesync() {
+    log "calling default beforesync..."
 }
-function aftersync () {
-    log calling default aftersync...
+aftersync() {
+    log "calling default aftersync..."
 }

 # internal variables, cannot (and *should not*) be changed unless you
 # understand exactly what you do.
 # Some variables were moved into the code (example: in the log() function),
 # for practical reasons, the absence of associative arrays being one of them.
+SCRIPT="$0"                     # full path to script
+CMDNAME=${0##*/}                # script name
+PID=$$                          # current pricess PID
 LOCKED=n                        # indicates if we created lock file.
-SUBJECT="${0##*/} ${*##*/}"     # mail subject (removes paths)
-ERROR=0                         # set by error_handler when called
 STARTTIME=$(date +%s)           # time since epoch in seconds
+HOSTNAME="$(hostname)"
+declare -A ERROR_STR=(          # error strings
+    [0]="ok"
+    [1]="error"
+    [2]="missing command"
+    [3]="source directory error"
+    [4]="could not create lock file"
+    [5]="could not rotate backup directories"
+    [6]="partial backup detected"
+    [7]="rsync error"
+    [8]="invalid command line"
+    [9]="missing configuration file"
+    [10]="missing destination directory"
+    [11]="cannot acquire lock"
+    [12]="cannot determine PID of locked directory"
+    [13]="error in rotation"
+    [14]="could not set modification time on target"
+    [15]="error on non-daily tree copy"
+)

-usage () {
-    echo "usage: ${0##*/} [-ymwdnfrzuD]" config-file
-    exit 1
+###############################################################################
+#########################  helper functions
+###############################################################################
+man() {
+    sed -n '/^#%MAN_BEGIN%/,/^#%MAN_END%$/{//!s/^#[ ]\{0,1\}//p}' "$SCRIPT" | more
 }

-# command-line options parsing.
-OPTIND=1
-while getopts ymwdfrnzuD todo
-do
-    case "${todo}" in
-        y)  YEARLY=y;;
-        m)  MONTHLY=y;;
-        w)  WEEKLY=y;;
-        d)  DAILY=y;;
-        f)  FILTERLNK=y;;
-        r)  RESUME=y;;
-        n)  MAILTO="";;
-        z)  COMPRESS=-y;;       # rsync compression. Depends on net/CPU perfs
-        u)  NUMID="--numeric-ids";;
-        D)  DEBUG=y;;
-        *)  usage;;
-    esac
-done
-# Now check remaining argument (configuration file), which should be unique,
-# and read the file.
-shift $((OPTIND - 1))
-(( $# != 1 )) && usage
-CONFIG="$1"
-if [[ ! -f "$CONFIG" ]]; then
-    echo "No $CONFIG file."
-    usage
-fi
-source "$CONFIG"
-
-# we set backups to be done if none has been set yet (i.e. none is "y").
-# Note: we use the form +%-d to avoid zero padding.
-#       for bash, starting with 0 => octal => 08 is invalid
-if ! [[ "${DAILY}${WEEKLY}${MONTHLY}${YEARLY}" =~ .*y.* ]]; then
-    (( $(date +%u) == 7 )) && WEEKLY=y
-    (( $(date +%-d) == 1 )) && MONTHLY=y
-    (( $(date +%-d) == 1 && $(date +%-m) == 1 )) && YEARLY=y
-    DAILY=y
-fi
-
-# set final variables values
-LOCKFILE=".sync-${SERVER}-${CONFIG##*/}.lock"
+usage() {
+    printf "usage: %s [-a PERIOD][-DflmnruvzZ] config-file\n" "$CMDNAME"
+    exit 8
+}

 # log function
 # parameters:
 # -l, -s: long, or short prefix (default: none). Last one is used.
 # -t: timestamp
 # -n: no newline
+# This function accepts either a string, either a format string followed
+# by arguments :
+#   log -s "%s" "foo"
+#   log -s "foo"
 log() {
-    timestr=""
-    prefix=""
-    opt=y
-    newline=y
-    while [[ $opt = y ]]; do
-        case $1 in
-            -l) prefix=$(printf "*%.s" {1..30});;
-            -s) prefix=$(printf "*%.s" {1..5});;
-            -n) newline=n;;
-            -t) timestr=$(date "+%F %T%z - ");;
-            *) opt=n;;
+    local timestr="" prefix="" newline=y todo OPTIND
+    while getopts lsnt todo; do
+        case $todo in
+            l) prefix=$(printf "*%.s" {1..30})
+               ;;
+            s) prefix=$(printf "*%.s" {1..5})
+               ;;
+            n) newline=n
+               ;;
+            t) timestr=$(date "+%F %T%z ")
+               ;;
+            *) ;;
        esac
-        [[ $opt = y ]] && shift
    done
+    shift $((OPTIND - 1))
    [[ $prefix != "" ]] && printf "%s " "$prefix"
-    printf "%s%s" "$timestr" "$*"
-    [[ $newline = y ]] && echo
+    [[ $timestr != "" ]] && printf "%s" "$timestr"
+    # shellcheck disable=SC2059
+    printf "$@"
+    [[ $newline = y ]] && printf "\n"
    return 0
 }

-# After these basic initializations, errors will be managed by the
-# following handler. It is better to do this before the redirections below.
-error_handler() {
-    ERROR=$2
-    echo "FATAL: Error line $1, exit code $2. Aborting."
-    exit "$ERROR"
+# prints out and run a command. Used mainly for rsync debug.
+echorun () {
+    log "%s" "$*"
+    "$@"
+    return $?
 }

-trap 'error_handler $LINENO $?' ERR SIGHUP SIGINT SIGTERM
+# lock system
+lock_lock() {
+    local opid pidfile="$LOCKDIR/pid"
+    #log -n "Setting lock: "
+    log "Acquire lock (%s), pid=%d" "$LOCKDIR" "$PID"
+    if [[ -d "$LOCKDIR" ]]; then
+        if [[ -r "$pidfile" ]]; then
+            read -r opid < "$pidfile"
+            if ps -p "$opid" &> /dev/null; then
+                log "PID %d (in %s) still active. Exiting." "$opid" "$pidfile"
+                exit 11
+            fi
+            log "Stale lock file found (pid=%d), forcing unlock... " "$opid"
+            lock_unlock -f
+            log "Re-Acquire lock (%s), pid=%d" "$LOCKDIR" "$PID"
+        else
+            log "lockdir exists with unknown PID"
+            exit 12
+        fi
+    fi
+    if ! mkdir "$LOCKDIR"; then
+        log "Cannot create lock file. Exiting."
+        exit 4
+    fi
+    printf "%d\n" "$PID" >> "$pidfile"
+    LOCKED=y
+    return 0
+}
+
+lock_unlock() {
+    local force=n
+    [[ $# == 1 && $1 == -f ]] && force=y
+    if [[ "$force" = y || "$LOCKED" = y ]]; then
+        if [[ "$force" = y ]]; then
+            log "Forced lock release (%s)" "$LOCKDIR"
+        else
+            log "Release lock (%s)" "$LOCKDIR"
+        fi
+        rm -vrf "$LOCKDIR"
+    else
+        log "Nothing to unlock (%s)" "$LOCKDIR"
+    fi
+    return 0
+}
+
+# Error handler.After these basic initializations, errors will be managed by the
+# following handler. It is better to do this before the redirections below.
+error_handler() {
+    local line="$1" err="$2"
+    printf "FATAL: Error line %s, exit code %s. Aborting.\n" "$line" "$err"
+    exit "$err"
+}

 exit_handler() {
+    local -i status="$?"
+    local error="${ERROR_STR[$status]}"
+    local subject="$CMDNAME: $SOURCEDIR on $HOSTNAME"
    # we dont need lock file anymore (another backup could start from now).
-    log "exit_handler LOCKED=$LOCKED"
-    #if [[ "$LOCKED" = y ]]; then
-    rm --dir --verbose "${LOCKFILE}"
-    #fi
+    lock_unlock

-    if (( ERROR == 0 )); then
-        SUBJECT="Successful $SUBJECT"
+    if (( status == 0 )); then
+        subject="$subject (Success)"
    else
-        SUBJECT="Failure in $SUBJECT"
+        subject="$subject (Failure: $error)"
    fi

    log -l -t "Ending backup."
@@ -255,149 +337,345 @@ exit_handler() {
        # restore stdout (not necessary), set temp file as stdin, close fd 3.
        # remove temp file (as still opened by stdin, will still be readable).
        exec 1<&3 3>&- 0<"$TMPFILE"
-        rm -f "$TMPFILE"
+        [[ $KEEPLOGFILE = n ]] && rm -f "$TMPFILE"
    else
-        echo 222
        exec 0<<<""             # force empty input for the following
    fi

-    # Warning: no logs allowed here (before next braces), as stdout is no
-    # more handled the final way.
+    SECS=$(( $(date +%s) - STARTTIME ))
+
+    # Warning: no logs allowed here (before next braces), as stdout will not
+    # be handled/filtered.
    {
-        SECS=$(($(date +%s)-STARTTIME))
-
        # we write these logs here so that they are on top if no DEBUG.
-        log "Exit code: $ERROR"
-        log "$(printf "Elapsed time: $SECS seconds (%d:%02d:%02d)\n\n" \
-            $((SECS/3600)) $((SECS%3600/60)) $((SECS%60)))"
+        printf "%s: Exit code: %d (%s) " "$CMDNAME" "$status" \
+               "${ERROR_STR[$status]}"

+        printf "in %d seconds (%d:%02d:%02d)\n" \
+               $((SECS)) $((SECS/3600)) $((SECS%3600/60)) $((SECS%60))
+
+        [[ $KEEPLOGFILE = y ]] && printf "log file kept at: %s\n" "$TMPFILE"
+        printf "\n"
        if [[ -n $FILTERLNK ]]; then
-            grep -vE "^(hf|cd|cL)[ \+]" ;
+            grep -vE "^(hf|cd|cL)[ \+]"
        else
-            cat ;
+            cat
        fi
    } |
    {
        if [[ -n $MAILTO ]]; then
-            mail -s "${SUBJECT}" "${MAILTO}";
+            {
+                MIMESTR="FEDCBA_0987654321"
+
+                # email header
+                printf "To: %s\n" "$MAILTO"
+                #printf "From: %s" "$MAILTO"
+                printf "Subject: %s\n" "$subject"
+                printf "MIME-Version: 1.0\n"
+                printf 'Content-Type: multipart/mixed; boundary="%s"\n' "$MIMESTR"
+                printf "\n"
+
+                # We write a short information in email's body
+                printf "\n--%s\n" "$MIMESTR"
+                printf 'Content-Type: text/plain; charset=UTF-8\n'
+                printf '\n'
+
+                # send first lines in message body (until the mark line or EOF)
+                has_mark_line=0
+                while read -r line; do
+                    if [[ $line =~ ^\*+\ Mark$ ]]; then
+                        has_mark_line=1
+                        break
+                    fi
+                    printf "%s\n" "$line"
+                done
+
+                # we prepare attachment only if a mark line was found
+                if ((  has_mark_line == 1 )); then
+                    printf "\n--%s\n" "$MIMESTR"
+                    if [[ "$ZIPMAIL" == cat ]]; then
+                        printf 'Content-Type: text/plain; charset=UTF-8\n'
+                        printf 'Content-Disposition: attachment; filename="sync-log.txt"\n'
+                    else
+                        printf "Content-Type: application/gzip\n"
+                        printf 'Content-Disposition: attachment; filename="sync-log.txt.gz"\n'
+                    fi
+                    printf "Content-Transfer-Encoding: base64\n"
+                    printf '\n'
+                    $ZIPMAIL | base64
+                fi
+                printf "\n--%s--\n" "$MIMESTR"
+            } | sendmail -it
        else
-            cat;
+            grep -vE "^\*+\ Mark$"
        fi
    }
 }
+
+###############################################################################
+#########################  Options/Environment setup
+###############################################################################
+# command-line parsing / configuration file read.
+parse_opts() {
+    OPTIND=0
+    shopt -s extglob                # to parse "-a" option
+    while getopts a:DflmnruvzZ todo; do
+        case "$todo" in
+            a)
+                # we use US (Unit Separator, 0x1F, control-_) as separator
+                # next line will add US before each char (including 1st one)
+                IFS=$'\x1F' read -ra periods <<< "${OPTARG//?()/$'\x1F'}"
+                # we skip 1st (empty) ellement of array
+                for period in "${periods[@]:1}"; do
+                    case "$period" in
+                        d) DAILY=y;;
+                        w) WEEKLY=y;;
+                        m) MONTHLY=y;;
+                        y) YEARLY=y;;
+                        *) printf '%s: unknown period "%s"\n' "$CMDNAME" "$period"
+                           usage
+                    esac
+                done
+                ;;
+            f)
+                FILTERLNK=y
+                ;;
+            r)
+                RESUME=y
+                ;;
+            l)
+                KEEPLOGFILE=y
+                ;;
+            m)
+                man
+                exit 0
+                ;;
+            n)
+                MAILTO=""
+                ;;
+            z)
+                COMPRESS=-y     # rsync compression. Depends on net/CPU perfs
+                ;;
+            u)
+                NUMID="--numeric-ids"
+                ;;
+            D)
+                DEBUG=y
+                ;;
+            Z)
+                ZIPMAIL="cat"
+                ;;
+            *)
+                usage
+                ;;
+        esac
+    done
+    # Now check remaining argument (configuration file), which should be unique,
+    # and read the file.
+    shift $((OPTIND - 1))
+    (( $# != 1 )) && usage
+    CONFIG="$1"
+
+    if [[ ! -r "$CONFIG" ]]; then
+        printf "%s: Cannot open $CONFIG file. Exiting.\n" "$CMDNAME"
+        exit 9
+    fi
+    # shellcheck source=sync-conf-example.sh
+    source "$CONFIG"
+
+    LOCKDIR="/tmp/$CMDNAME-$HOSTNAME-${CONFIG##*/}.lock"
+}
+
+parse_opts "$@"
+
+# we set backups to be done if none has been set yet (i.e. none is "y").
+# Note: we use the form +%-d to avoid zero padding :
+# for bash, starting with 0 => octal => 08 is invalid
+adjust_targets() {
+    if ! [[ "$DAILY$WEEKLY$MONTHLY$YEARLY" =~ .*y.* ]]; then
+        (( $(date +%u) == 7 )) && WEEKLY=y
+        (( $(date +%-d) == 1 )) && MONTHLY=y
+        (( $(date +%-d) == 1 && $(date +%-m) == 1 )) && YEARLY=y
+        DAILY=y
+    fi
+}
+
+adjust_targets
+
+# After these basic initializations, errors will be managed by the
+# following handler. It is better to do this before the redirections below.
+trap 'error_handler $LINENO $?' ERR SIGHUP SIGINT SIGTERM
 trap 'exit_handler' EXIT

+# activate exit on error
+# set -o errexit errtrace nounset pipefail
+
 # standard descriptors redirection.
 # if not DEBUG, save stdout as fd 3, and redirect stdout to temp file.
 # in case of DEBUG, we could close stdin, but there could be side effects,
 # such as ^C handling, etc... So we keep the keyboard available.
 if [[ $DEBUG = n ]]; then
-    TMPFILE=$(mktemp /tmp/sync-log.XXXXXX)
-    exec 3<&1 >"${TMPFILE}"     # no more output on screen from now.
+    TMPFILE=$(mktemp /tmp/sync-XXXXXXXX.log)
+    exec 3<&1 >"$TMPFILE"     # no more output on screen from now.
 fi
 exec 2>&1
-if [[ ! -d $SOURCEDIR ]]; then
-    log -s "Source directory (\"${SOURCEDIR}\") is not a valid directory."
-    error_handler $LINENO 1
-fi
-cd ${SOURCEDIR}

 # prepare list of backups, such as "daily 7 weekly 4", etc...
+# the order is important.
 TODO=()
-[[ $DAILY = y && $NDAYS -gt 0 ]]     && TODO+=(daily "$NDAYS")
-[[ $WEEKLY = y && $NWEEKS -gt 0 ]]   && TODO+=(weekly "$NWEEKS")
-[[ $MONTHLY = y && $NMONTHS -gt 0 ]] && TODO+=(monthly "$NMONTHS")
-[[ $YEARLY = y && $NYEARS -gt 0 ]]   && TODO+=(yearly "$NYEARS")
+[[ $DAILY   = y ]] && (( NDAYS   > 0 )) && TODO+=(daily   "$NDAYS")
+[[ $WEEKLY  = y ]] && (( NWEEKS  > 0 )) && TODO+=(weekly  "$NWEEKS")
+[[ $MONTHLY = y ]] && (( NMONTHS > 0 )) && TODO+=(monthly "$NMONTHS")
+[[ $YEARLY  = y ]] && (( NYEARS  > 0 )) && TODO+=(yearly  "$NYEARS")
+
+log -l -t "Starting %s" "$CMDNAME"
+log "Bash version: %s.%s.%s" \
+    "${BASH_VERSINFO[0]}" "${BASH_VERSINFO[1]}" "${BASH_VERSINFO[2]}"
+log "Hostname: %s" "$HOSTNAME"
+log "Operating System: %s on %s" "$(uname -sr)" "$(uname -m)"
+log "Config : %s\n" "$CONFIG"
+log "Src dir: %s" "$SOURCEDIR"
+log "Dst dir: %s" "$SERVER:$DESTDIR"
+log "Actions: %s" "${TODO[*]}"
+if (( ${#RSYNCOPTS[@]} )); then
+    log -n "Rsync additional options (%d): " "${#RSYNCOPTS[@]}"
+    for opt in "${RSYNCOPTS[@]}"; do
+        log -n '\"%s\" ' "$opt"
+    done
+    log ""
+else
+    log "Rsync additional options : None."
+fi
+
+log -n "Mail recipient: "
+# shellcheck disable=SC2015
+[[ -n "$MAILTO" ]] && log "$MAILTO" || log "<unset>"
+# shellcheck disable=SC2015
+log -n "Compression: " && [[ $ZIPMAIL = gzip ]] && log "gzip" || log "none"
+
+# check availability of necessary commands
+declare -a cmdavail=()
+declare error=0
+log -n "Checking for commands : "
+for cmd in rsync base64 sendmail gzip; do
+    log -n "%s..." "$cmd"
+    if type -P "$cmd" > /dev/null; then
+        log -n "ok "
+    else
+        (( error++ ))
+        log -n "NOK "
+        case "$cmd" in
+            gzip)
+                log -n "(compression disabled) "
+                ZIPMAIL="cat"
+                (( error-- ))   # Not an error
+               ;;
+            sendmail)
+                MAILTO=""       # to get some output in cron
+                ;;
+        esac
+        cmdavail+=("$cmd")
+    fi
+done
+log ""
+(( ${#cmdavail[@]} )) && log -s "Please install the following programs: %s." \
+                             "${cmdavail[*]}"
+(( error > 0 )) && exit 2
+unset cmdavail
+unset error
+
+# all logs from this point will be in email attachment
+log -s "Mark"                   # to separate email body
+
+log -l -t "Starting backup"
+# create lock file
+lock_lock

-log -l -t "Starting backup."
-log "Config : ${CONFIG}"
-log "Src dir: ${SOURCEDIR}"
-log "Dst dir: ${SERVER}:${DESTDIR}"
-log "Actions: ${TODO[@]}"

 # select handling depending on local or networked target (ssh or not).
 if [[ $SERVER = local ]]; then  # local backup
    DOIT=""
-    DEST=${DESTDIR}
+    DEST="$DESTDIR"
 else                            # remote backup
-    DOIT="ssh ${SERVER}"
-    DEST="${SERVER}:${DESTDIR}"
+    DOIT="ssh $SERVER"
+    DEST="$SERVER:$DESTDIR"
 fi

 # commands and specific variables.
-EXIST="${DOIT} test -e"
-MOVE="${DOIT} mv"
-REMOVE="${DOIT} rm -rf"
-COPYHARD="${DOIT} rsync -ar"
-
-# prints out and run a command. Used mainly for rsync debug.
-echorun () {
-    log "$@"
-    "$@"
-    return $?
-}
+EXIST="$DOIT test -e"
+MOVE="$DOIT mv"
+REMOVE="$DOIT rm -rf"
+COPYHARD="$DOIT rsync -ar"
+TOUCH="$DOIT touch"

 # rotate files. arguments are a string and a number. For instance $1=weekly,
 # $2=3.
 # we first build a list from $2 to zero, with 2 padded digits: 03 02 01 00
 # then we remove $1-03, and move $1-02 to $1-03, $1-01 to $1-02, etc...
-rotate-files () {
-    files=( $(seq -f "${DESTDIR}/${1}-%02g" "${2}" -1 0) )
-    log -s -t -n "${files[0]##*/} deletion... "
-    status=0
-    ${REMOVE} "${files[0]}" || status=$?
-    if (( status != 0 )); then
+rotate-files() {
+    # shellcheck disable=SC2207
+    local -a files=( $(seq -f "$DESTDIR/$1-%02g" "$2" -1 0) )
+    log -s -t -n "deleting %s... " "${files[0]##*/}"
+    if ! $REMOVE "${files[0]}"; then
        # this should never happen.
        # But I saw this event in case of a file system corruption. Better
        # is to stop immediately instead of accepting strange side effects.
-        if ${EXIST} "${files[0]}" ; then
-            log -s "Could not remove ${files[0]}. This SHOULD NOT happen."
-            error_handler $LINENO ${status}
+        if $EXIST "${files[0]}" ; then
+            log -s "Could not remove %s. This SHOULD NOT happen." "${files[0]}"
+            exit 5
        fi
    fi
    log "done."

-    log -s -t -n "${1} rotation... "
-    while (( ${#files[@]} > 1 ))
-    do
-        if ${EXIST} "${files[1]}" ; then
-            [[ $DEBUG = y ]] && log -n "${files[1]:(-2)} "
-            ${MOVE} "${files[1]}" "${files[0]}"
+    log -s -t -n "rotating " "$1"
+    while (( ${#files[@]} > 1 )); do
+        if $EXIST "${files[1]}" ; then
+            log -n "%s... " "${files[1]##*/}"
+            if ! $MOVE "${files[1]}" "${files[0]}"; then
+                log "error"
+                exit 13
+            fi
+
        fi
-        unset files[0]          # shift and pack array
+        unset "files[0]"        # shift and pack array
        files=( "${files[@]}" )
    done
    log "done."
    return 0
 }

-# create lock file
-if ! mkdir "${LOCKFILE}"; then
-    log -s  "Cannot create lock file. Exiting."
-    error_handler $LINENO 1
+if [[ ! -d "$SOURCEDIR" ]]; then
+    log -s "Invalid source directory (%s)." "$SOURCEDIR"
+    exit 3
+fi
+if ! cd "$SOURCEDIR"; then
+    log -s "Cannot cd to %s." "$SOURCEDIR"
+    exit 3
+fi
+if ! $EXIST "$DESTDIR"; then
+    log -s 'destination directory (%s) missing.' "$DESTDIR"
+    exit 10
 fi
-LOCKED=y

 # main loop.
-while [[ ${TODO[0]} != "" ]]
-do
+while [[ ${TODO[0]} != "" ]]; do
    # these variables to make the script easier to read.
    todo="${TODO[0]}"           # daily, weekly, etc...
    keep="${TODO[1]}"           # # of versions to keep for $todo set
-    todop="${DESTDIR}/${todo}"  # prefix for backup (e.g. "destdir/daily")
-    tdest="${todop}-00"         # target full path (e.g. "destdir/daily-00")
-    ldest="${DESTDIR}/daily-01" # link-dest dir (always daily-01)
+    todop="$DESTDIR/$todo"      # prefix for backup (e.g. "destdir/daily")
+    tdest="$todop-00"           # target full path (e.g. "destdir/daily-00")
+    ldest="$DESTDIR/daily-01"   # link-dest dir (always daily-01)

-    log -l -t "${todo} backup..."
+    log -l -t "%s backup..." "$todo"

    # check if target (XX-00) directory exists. If yes, we must have the
    # resume option to go on.
-    if ${EXIST} "${tdest}"; then
+    if $EXIST "$tdest"; then
        if [[ $RESUME = n ]]; then
-            log -s "${tdest} already exists, and no \"resume\" option."
-            error_handler $LINENO 1
+            log -s '%s already exists, and no "resume" option.' "$tdest"
+            exit 6
        fi
-        log -s "Warning: Resuming ${todo} partial backup.".
+        log -s "Warning: Resuming %s partial backup." "$todo"
    fi

    # daily backup.
@@ -413,34 +691,41 @@ do
        status=0
        echorun rsync \
            -aHixv \
-            "${FILTER}" \
-            ${RSYNCOPTS} \
-            ${COMPRESS} \
-            ${NUMID} \
+            "${RSYNCOPTS[@]}" \
+            $COMPRESS \
+            $NUMID \
            --delete \
            --delete-during \
            --delete-excluded \
-            --modify-window=${MODIFYWINDOW} \
+            --modify-window=$MODIFYWINDOW \
            --partial \
-            --link-dest="${ldest}" \
+            --link-dest="$ldest" \
            . \
-            "${DEST}/daily-00" || status=$?
+            "$DEST/daily-00" || status=$?
        # error 24 is "vanished source file", and should be ignored.
        if (( status != 24 && status != 0)); then
-            error_handler $LINENO $status
+            log -s "rsync error %d" "$status"
+            exit 7
+        fi
+        if ! $TOUCH "$tdest"; then
+            log -s "cannot change %s modification time (error %d)" \
+                "$DEST/daily-00" "$status"
+            exit 14
        fi
        aftersync               # script to run after the sync
-    else                        # non-daily case.
-        status=0
-        ${EXIST} "${ldest}" || status=$?
-        if ((status == 0 )); then
-            log -s -t "${tdest} update..."
-            ${COPYHARD} --link-dest="${ldest}" "${ldest}/" "${tdest}"
+    else                        # non-daily case
+        if $EXIST "$ldest"; then
+            # if ((status == 0 )); then
+            log -s -t "%s update..." "$tdest"
+            if ! $COPYHARD --link-dest="$ldest" "$ldest/" "$tdest"; then
+                log -s "copyhard error %d" "$status"
+                exit 15
+            fi
        else
-            log "No ${ldest} directory. Skipping ${todo} backup."
+            log "No %s directory. Skipping %s backup." "$ldest" "$todo"
        fi
    fi
-    rotate-files "${todo}" "${keep}"
+    rotate-files "$todo" "$keep"

    # shift and pack TODO array
    unset 'TODO[0]' 'TODO[1]'
--- a/bash/trans.sh
+++ b/bash/trans.sh
@@ -2,14 +2,14 @@
 #
 # trans.sh - Translate words using linguee.com.
 #
-# (C) Bruno Raoult ("br"), 2021
-# Licensed under the Mozilla Public License (MPL) version 2.0.
+# (C) Bruno Raoult ("br"), 2021-2022
+# Licensed under the GNU General Public License v3.0 or later.
 # Some rights reserved. See COPYING.
 #
-# You should have received a copy of the Mozilla Public License along with this
-# program.  If not, see <https://www.mozilla.org/en-US/MPL>
+# You should have received a copy of the GNU General Public License along with this
+# program. If not, see <https://www.gnu.org/licenses/gpl-3.0-standalone.html>.
 #
-# SPDX-License-Identifier: MPL-2.0 <https://spdx.org/licenses/MPL-2.0.html>
+# SPDX-License-Identifier: GPL-3.0-or-later <https://spdx.org/licenses/GPL-3.0-or-later.html>
 #
 # Options: See usage function in code below.

--- a/c/COPYING
+++ b/c/COPYING
@@ -0,0 +1,674 @@
+                    GNU GENERAL PUBLIC LICENSE
+                       Version 3, 29 June 2007
+
+ Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+                            Preamble
+
+  The GNU General Public License is a free, copyleft license for
+software and other kinds of works.
+
+  The licenses for most software and other practical works are designed
+to take away your freedom to share and change the works.  By contrast,
+the GNU General Public License is intended to guarantee your freedom to
+share and change all versions of a program--to make sure it remains free
+software for all its users.  We, the Free Software Foundation, use the
+GNU General Public License for most of our software; it applies also to
+any other work released this way by its authors.  You can apply it to
+your programs, too.
+
+  When we speak of free software, we are referring to freedom, not
+price.  Our General Public Licenses are designed to make sure that you
+have the freedom to distribute copies of free software (and charge for
+them if you wish), that you receive source code or can get it if you
+want it, that you can change the software or use pieces of it in new
+free programs, and that you know you can do these things.
+
+  To protect your rights, we need to prevent others from denying you
+these rights or asking you to surrender the rights.  Therefore, you have
+certain responsibilities if you distribute copies of the software, or if
+you modify it: responsibilities to respect the freedom of others.
+
+  For example, if you distribute copies of such a program, whether
+gratis or for a fee, you must pass on to the recipients the same
+freedoms that you received.  You must make sure that they, too, receive
+or can get the source code.  And you must show them these terms so they
+know their rights.
+
+  Developers that use the GNU GPL protect your rights with two steps:
+(1) assert copyright on the software, and (2) offer you this License
+giving you legal permission to copy, distribute and/or modify it.
+
+  For the developers' and authors' protection, the GPL clearly explains
+that there is no warranty for this free software.  For both users' and
+authors' sake, the GPL requires that modified versions be marked as
+changed, so that their problems will not be attributed erroneously to
+authors of previous versions.
+
+  Some devices are designed to deny users access to install or run
+modified versions of the software inside them, although the manufacturer
+can do so.  This is fundamentally incompatible with the aim of
+protecting users' freedom to change the software.  The systematic
+pattern of such abuse occurs in the area of products for individuals to
+use, which is precisely where it is most unacceptable.  Therefore, we
+have designed this version of the GPL to prohibit the practice for those
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+                     END OF TERMS AND CONDITIONS
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+    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
+    under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License.  Of course, your program's commands
+might be different; for a GUI interface, you would use an "about box".
+
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU GPL, see
+<https://www.gnu.org/licenses/>.
+
+  The GNU General Public License does not permit incorporating your program
+into proprietary programs.  If your program is a subroutine library, you
+may consider it more useful to permit linking proprietary applications with
+the library.  If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.  But first, please read
+<https://www.gnu.org/licenses/why-not-lgpl.html>.
--- a/c/Makefile
+++ b/c/Makefile
@@ -0,0 +1,87 @@
+# Tools Makefile
+#
+# Copyright (C) 2022 Bruno Raoult ("br")
+# Licensed under the GNU General Public License v3.0 or later.
+# Some rights reserved. See COPYING.
+#
+# You should have received a copy of the GNU General Public License along with this
+# program. If not, see <https://www.gnu.org/licenses/gpl-3.0-standalone.html>.
+#
+# SPDX-License-Identifier: GPL-3.0-or-later <https://spdx.org/licenses/GPL-3.0-or-later.html>
+#
+
+SHELL  := /bin/bash
+CC     := gcc
+
+CFLAGS += -std=gnu99
+CFLAGS += -O2
+CFLAGS += -g
+CFLAGS += -Wall
+CFLAGS += -Wextra
+CFLAGS += -march=native
+CFLAGS += -Wmissing-declarations
+CFLAGS += -Wno-unused-result
+
+# for gprof
+#CFLAGS += -pg
+
+# Next one may be useful for valgrind (some invalid instructions)
+# CFLAGS += -mno-tbm
+
+CFLAGS += -DDEBUG_DEBUG		# activate general debug (debug.c)
+CFLAGS += -DDEBUG_POOL		# memory pools management
+
+INCDIR    := ./include
+LIBDIR    := ./lib
+OBJDIR    := ./obj
+
+LIBNAME   := br_$(shell uname -m)
+LIB       := lib$(LIBNAME)
+SLIB      := $(LIBDIR)/$(LIB).a
+DLIB      := $(LIBDIR)/$(LIB).so
+LIBSRC    := $(wildcard *.c)
+LIBOBJ    := $(addprefix $(OBJDIR)/,$(patsubst %.c,%.o,$(LIBSRC)))
+LDFLAGS   := -L$(LIBDIR)
+LDLIB     := -l$(LIB)
+
+export LD_LIBRARY_PATH = $(LIBDIR)
+#export PATH := .:$(PATH)
+
+.PHONY: all libs clean dirs
+
+all: libs
+
+libs: dirs $(DLIB) $(SLIB)
+
+dirs: $(LIBDIR) $(OBJDIR)
+
+$(LIBDIR) $(OBJDIR):
+	@echo creating $@ directory.
+	@mkdir $@
+
+clean:
+	@echo deleting $(OBJDIR) and $(LIBDIR) directories.
+	@$(RM) -rf $(LIBDIR) $(OBJDIR)
+
+$(SLIB): $(LIBOBJ)
+	@echo building $@ static library.
+	@$(AR) $(ARFLAGS) -o $@ $^
+
+$(DLIB): CFLAGS += -fPIC
+$(DLIB): LDFLAGS += -shared
+$(DLIB): $(LIBOBJ)
+	@echo building $@ shared library.
+	@$(CC) $(LDFLAGS) $^ -o $@
+
+.c:
+	@echo compiling $<
+	@$(CC) $(CFLAGS) $(LDFLAGS) -I $(INCDIR) $< $(LDLIB) -o $@
+
+#.c.o:
+$(OBJDIR)/%.o: %.c
+	@echo compiling $<.
+	@$(CC) -c $(CFLAGS) $(LDFLAGS) -I $(INCDIR) -o $@ $<
+
+.c.s:
+	@echo generating $@
+	@$(CC) -S -fverbose-asm $(CFLAGS) -I $(INCDIR) $< -o $@
--- a/c/debug.c
+++ b/c/debug.c
@@ -0,0 +1,111 @@
+/* debug.c - debug/log management
+ *
+ * Copyright (C) 2021 Bruno Raoult ("br")
+ * Licensed under the GNU General Public License v3.0 or later.
+ * Some rights reserved. See COPYING.
+ *
+ * You should have received a copy of the GNU General Public License along with this
+ * program. If not, see <https://www.gnu.org/licenses/gpl-3.0-standalone.html>.
+ *
+ * SPDX-License-Identifier: GPL-3.0-or-later <https://spdx.org/licenses/GPL-3.0-or-later.html>
+ *
+ */
+
+#include <stdio.h>
+#include <stdarg.h>
+#include <time.h>
+
+#ifndef DEBUG_DEBUG
+#define DEBUG_DEBUG
+#endif
+
+#include "debug.h"
+
+#define NANOSEC  1000000000                       /* nano sec in sec */
+#define MILLISEC 1000000                          /* milli sec in sec */
+
+static s64 timer_start;                           /* in nanosecond */
+static u32 debug_level=0;
+
+void debug_level_set(u32 level)
+{
+    debug_level = level;
+
+    log(1, "debug level set to %u\n", level);
+}
+
+void debug_init(u32 level)
+{
+    struct timespec timer;
+
+    debug_level_set(level);
+    if (!clock_gettime(CLOCK_MONOTONIC, &timer)) {
+        timer_start = timer.tv_sec * NANOSEC + timer.tv_nsec;
+    }
+    else {
+        timer_start = 0;
+    }
+    log(0, "timer started.\n");
+}
+
+inline static s64 timer_elapsed()
+{
+    struct timespec timer;
+
+    clock_gettime(CLOCK_MONOTONIC, &timer);
+    return (timer.tv_sec * NANOSEC + timer.tv_nsec) - timer_start;
+}
+
+
+/* void debug - log function
+ * @timestamp : boolean
+ * @indent    : indent level (2 spaces each)
+ * @src       : source file/func name (or NULL)
+ * @line      : line number
+ */
+void debug(u32 level, bool timestamp, u32 indent, const char *src,
+           u32 line, const char *fmt, ...)
+{
+    if (level > debug_level)
+        return;
+
+    va_list ap;
+
+    if (indent)
+        printf("%*s", 2*(indent-1), "");
+
+    if (timestamp) {
+        s64 diff = timer_elapsed();
+        printf("%ld.%03ld ", diff/NANOSEC, (diff/1000000)%1000);
+        printf("%010ld ", diff);
+    }
+
+    if (src) {
+        if (line)
+            printf("[%s:%u] ", src, line);
+        else
+            printf("[%s] ", src);
+    }
+    va_start(ap, fmt);
+    vprintf(fmt, ap);
+    va_end(ap);
+}
+
+#ifdef BIN_debug
+#include <unistd.h>
+
+int main()
+{
+    int foo=1;
+    debug_init(5);
+
+    log(0, "log0=%d\n", foo++);
+    log(1, "log1=%d\n", foo++);
+    log(2, "log2=%d\n", foo++);
+    log_i(2, "log_i 2=%d\n", foo++);
+    log_i(5, "log_i 5=%d\n", foo++);
+    log_i(6, "log_i 6=%d\n", foo++);
+    log_it(4, "log_it 4=%d\n", foo++);
+    log_f(1, "log_f 5=%d\n", foo++);
+}
+#endif
--- a/c/include/bits.h
+++ b/c/include/bits.h
@@ -0,0 +1,277 @@
+/* bits.h - bits functions.
+ *
+ * Copyright (C) 2021-2022 Bruno Raoult ("br")
+ * Licensed under the GNU General Public License v3.0 or later.
+ * Some rights reserved. See COPYING.
+ *
+ * You should have received a copy of the GNU General Public License along with this
+ * program. If not, see <https://www.gnu.org/licenses/gpl-3.0-standalone.html>.
+ *
+ * SPDX-License-Identifier: GPL-3.0-or-later <https://spdx.org/licenses/GPL-3.0-or-later.html>
+ *
+ */
+#ifndef BITS_H
+#define BITS_H
+
+#include <stdint.h>
+
+/* next include will define __WORDSIZE: 32 or 64
+ */
+#include <bits/wordsize.h>
+
+#ifndef __has_builtin
+#define __has_builtin(x) 0
+#endif
+
+/* no plan to support 32bits for now...
+ */
+#if __WORDSIZE != 64
+#error "Only 64 bits word size supported."
+#endif
+
+/* fixed-size types
+ */
+typedef int64_t  s64;
+typedef int32_t  s32;
+typedef int16_t  s16;
+typedef int8_t   s8;
+
+typedef uint64_t u64;
+typedef uint32_t u32;
+typedef uint16_t u16;
+typedef uint8_t  u8;
+
+/* convenience types
+ */
+typedef unsigned long int ulong;
+typedef unsigned int uint;
+typedef unsigned short ushort;
+typedef unsigned char uchar;
+
+/* char is a special case, as it can be signed or unsigned
+ */
+typedef signed char schar;
+
+/* count trailing zeroes : 00101000 -> 3
+ *                              ^^^
+ */
+static inline int ctz64(u64 n)
+{
+#   if __has_builtin(__builtin_ctzl)
+#   ifdef DEBUG_BITS
+    log_f(1, "builtin ctzl.\n");
+#   endif
+    return __builtin_ctzl(n);
+
+#   elif __has_builtin(__builtin_clzl)
+#   ifdef DEBUG_BITS
+    log_f(1, "builtin clzl.\n");
+#   endif
+    return __WORDSIZE - (__builtin_clzl(n & -n) + 1);
+
+#   else
+#   ifdef DEBUG_BITS
+    log_f(1, "emulated.\n");
+#   endif
+    return popcount64((n & −n) − 1);
+#   endif
+}
+
+static inline int ctz32(u32 n)
+{
+#   if __has_builtin(__builtin_ctz)
+#   ifdef DEBUG_BITS
+    log_f(1, "builtin ctz.\n");
+#   endif
+    return __builtin_ctzl(n);
+
+#   elif __has_builtin(__builtin_clz)
+#   ifdef DEBUG_BITS
+    log_f(1, "builtin clz.\n");
+#   endif
+    return __WORDSIZE - (__builtin_clz(n & -n) + 1);
+
+#   else
+#   ifdef DEBUG_BITS
+    log_f(1, "emulated.\n");
+#   endif
+    return popcount32((n & −n) − 1);
+#   endif
+}
+
+/* count leading zeroes : 00101000 -> 2
+ *                        ^^
+ */
+static inline int clz64(u64 n)
+{
+#   if __has_builtin(__builtin_clzl)
+#   ifdef DEBUG_BITS
+    log_f(1, "builtin.\n");
+#   endif
+    return __builtin_clzl(n);
+
+#   else
+#   ifdef DEBUG_BITS
+    log_f(1, "emulated.\n");
+#   endif
+    u64 r, q;
+
+    r = (n > 0xFFFFFFFF) << 5; n >>= r;
+    q = (n > 0xFFFF)     << 4; n >>= q; r |= q;
+    q = (n > 0xFF  )     << 3; n >>= q; r |= q;
+    q = (n > 0xF   )     << 2; n >>= q; r |= q;
+    q = (n > 0x3   )     << 1; n >>= q; r |= q;
+    r |= (n >> 1);
+    return 64 - r - 1;
+#   endif
+}
+
+static inline int clz32(u32 n)
+{
+#   if __has_builtin(__builtin_clz)
+#   ifdef DEBUG_BITS
+    log_f(1, "builtin.\n");
+#   endif
+    return __builtin_clz(n);
+
+#   else
+#   ifdef DEBUG_BITS
+    log_f(1, "emulated.\n");
+#   endif
+    u32 r, q;
+
+    r = (n > 0xFFFF)     << 4; n >>= r;
+    q = (n > 0xFF  )     << 3; n >>= q; r |= q;
+    q = (n > 0xF   )     << 2; n >>= q; r |= q;
+    q = (n > 0x3   )     << 1; n >>= q; r |= q;
+    r |= (n >> 1);
+    return 32 - r - 1;
+#   endif
+}
+
+/* find first set :  00101000 -> 4
+ *                       ^
+ */
+static inline uint ffs64(u64 n)
+{
+#   if __has_builtin(__builtin_ffsl)
+#   ifdef DEBUG_BITS
+    log_f(1, "builtin ffsl.\n");
+#   endif
+    return __builtin_ffsl(n);
+
+#   elif __has_builtin(__builtin_ctzl)
+#   ifdef DEBUG_BITS
+    log_f(1, "builtin ctzl.\n");
+#   endif
+    if (n == 0)
+        return (0);
+    return __builtin_ctzl(n) + 1;
+
+#   else
+#   ifdef DEBUG_BITS
+    log_f(1, "emulated.\n");
+#   endif
+    return popcount64(n ^ ~-n);
+#   endif
+}
+
+static inline uint ffs32(u32 n)
+{
+#   if __has_builtin(__builtin_ffs)
+#   ifdef DEBUG_BITS
+    log_f(1, "builtin ffs.\n");
+#   endif
+    return __builtin_ffs(n);
+
+#   elif __has_builtin(__builtin_ctz)
+#   ifdef DEBUG_BITS
+    log_f(1, "builtin ctz.\n");
+#   endif
+    if (n == 0)
+        return (0);
+    return __builtin_ctz(n) + 1;
+
+#   else
+#   ifdef DEBUG_BITS
+    log_f(1, "emulated.\n");
+#   endif
+    return popcount32(n ^ ~-n);
+#   endif
+}
+
+/* count set bits:  10101000 -> 3
+ *                  ^ ^ ^
+ */
+static inline int popcount64(u64 n)
+{
+#   if __has_builtin(__builtin_popcountl)
+#   ifdef DEBUG_BITS
+    log_f(1, "builtin.\n");
+#   endif
+    return __builtin_popcountl(n);
+
+#   else
+#   ifdef DEBUG_BITS
+    log_f(1, "emulated.\n");
+#   endif
+    int count = 0;
+    while (n) {
+        count++;
+        n &= (n - 1);
+    }
+    return count;
+#   endif
+}
+
+static inline int popcount32(u32 n)
+{
+#   if __has_builtin(__builtin_popcount)
+#   ifdef DEBUG_BITS
+    log_f(1, "builtin.\n");
+#   endif
+    return __builtin_popcount(n);
+
+#   else
+#   ifdef DEBUG_BITS
+    log_f(1, "emulated.\n");
+#   endif
+    int count = 0;
+    while (n) {
+        count++;
+        n &= (n - 1);
+    }
+    return count;
+#   endif
+}
+
+/** bit_for_each - iterate over an u64/u32 bits
+ * @pos:        an int used as current bit
+ * @tmp:        a temp u64/u32 used as temporary storage
+ * @ul:         the u64/u32 to loop over
+ *
+ * Usage:
+ * u64 u=139, _t;     //  u=b10001011
+ * int cur;
+ * bit_for_each64(cur, _t, u) {
+ *     printf("%d\n", cur);
+ * }
+ * This will display the position of each bit set in ul: 1, 2, 4, 8
+ *
+ * I should probably re-think the implementation...
+ */
+#define bit_for_each64(pos, tmp, ul)                                    \
+    for (tmp = ul, pos = ffs64(tmp); tmp; tmp &= (tmp - 1),  pos = ffs64(tmp))
+
+#define bit_for_each32(pos, tmp, ul)                                    \
+    for (tmp = ul, pos = ffs32(tmp); tmp; tmp &= (tmp - 1),  pos = ffs32(tmp))
+
+/** or would it be more useful (counting bits from zero instead of 1) ?
+ */
+#define bit_for_each64_2(pos, tmp, ul)                                  \
+    for (tmp = ul, pos = ctz64(tmp); tmp; tmp ^= 1UL << pos, pos = ctz64(tmp))
+
+#define bit_for_each32_2(pos, tmp, ul)                                  \
+    for (tmp = ul, pos = ctz32(tmp); tmp; tmp ^= 1U << pos, pos = ctz32(tmp))
+
+#endif  /* BITS_H */
--- a/c/include/debug.h
+++ b/c/include/debug.h
@@ -0,0 +1,84 @@
+/* debug.h - debug/log management.
+ *
+ * Copyright (C) 2021-2022 Bruno Raoult ("br")
+ * Licensed under the GNU General Public License v3.0 or later.
+ * Some rights reserved. See COPYING.
+ *
+ * You should have received a copy of the GNU General Public License along with this
+ * program. If not, see <https://www.gnu.org/licenses/gpl-3.0-standalone.html>.
+ *
+ * SPDX-License-Identifier: GPL-3.0-or-later <https://spdx.org/licenses/GPL-3.0-or-later.html>
+ *
+ */
+
+#ifndef DEBUG_H
+#define DEBUG_H
+
+#include <stdbool.h>
+#include <stdint.h>
+
+#include "bits.h"
+
+#define _unused __attribute__((__unused__))
+#define _printf __attribute__ ((format (printf, 6, 7)))
+#ifdef DEBUG_DEBUG
+void debug_init(u32 level);
+void debug_level_set(u32 level);
+void _printf debug(u32 level, bool timestamp,
+                   u32 indent, const char *src,
+                   u32 line, const char *, ...);
+#else  /* DEBUG_DEBUG */
+static inline void debug_init(_unused u32 level) {}
+static inline void debug_level_set(_unused u32 level) {}
+static inline void _printf debug(_unused u32 level, _unused bool timestamp,
+                                 _unused u32 indent, _unused const char *src,
+                                 _unused u32 line, const char *, ...) {}
+#endif  /* DEBUG_DEBUG */
+#undef _unused
+#undef _printf
+
+/* format: only printf
+ */
+#define log(level, fmt, args...) \
+    debug((level), false, 0, NULL, 0, fmt, ##args)
+
+/* format : indent, no func name, no timestamp
+ * >>>>val=2
+ */
+#define log_i(level, fmt, args...) \
+    debug((level), false, (level), NULL, 0, fmt, ##args)
+
+/* format : func name, no indent, no timestamp
+ * [foo] val=2
+ */
+#define log_f(level, fmt, args...) \
+    debug((level), false, 0, __func__, 0, fmt, ##args)
+
+/* format : func name, no indent, no timestamp
+ * >>>> [foo:15] val=2
+ */
+#define log_if(level, fmt, args...) \
+    debug((level), false, (level), __func__, __LINE__, fmt, ##args)
+
+/* format : func name, indent, timestamp
+ * >>>>foo:15 val=2
+ */
+#define log_it(level, fmt, args...) \
+    debug((level), true, (level), __func__, __LINE__, fmt, ##args)
+
+/* format: file name, no indent, no timestamp
+ * foo:15 val=2
+ *
+ * #define log_f(level, fmt, args...)                            \
+ *   debug((level), false, 0, __FILE__, __LINE__, fmt, args)
+ */
+
+#else
+#define log(level, fmt, args...)
+#define log_i(...)
+#define log_f(...)
+#define log_if(...)
+#define log_it(...)
+#define log_f(...)
+
+#endif  /* DEBUG_H */
--- a/c/include/list.h
+++ b/c/include/list.h
@@ -4,11 +4,13 @@
 * Main change is that I don't use READ_ONCE and WRITE_ONCE
 * See https://www.kernel.org/doc/Documentation/memory-barriers.txt
 */
+
 #ifndef __BR_LIST_H
 #define __BR_LIST_H

 #include <stddef.h>
 #include <stdbool.h>
+#include "rwonce.h"

 /************ originally in <include/linux/types.h> */
 struct list_head {
@@ -23,12 +25,18 @@ struct hlist_node {
 };

 /************ originally in <include/linux/poison.h> */
-#define LIST_POISON1  ((void *) 0x100)
-#define LIST_POISON2  ((void *) 0x122)
+# define POISON_POINTER_DELTA 0
+/* These are non-NULL pointers that will result in page faults
+ * under normal circumstances, used to verify that nobody uses
+ * non-initialized list entries.
+ */
+#define LIST_POISON1  ((void *) 0x100 + POISON_POINTER_DELTA)
+#define LIST_POISON2  ((void *) 0x200 + POISON_POINTER_DELTA)

 /************ originally in <include/linux/kernel.h> */
-#define container_of(ptr, type, member) \
-    ((type *)((char *)(ptr) - offsetof(type, member)))
+#define container_of(ptr, type, member) ({				\
+	void *__mptr = (void *)(ptr);					\
+	((type *)(__mptr - offsetof(type, member))); })

 /*
 * Circular doubly linked list implementation.
@@ -54,7 +62,7 @@ struct hlist_node {
 */
 static inline void INIT_LIST_HEAD(struct list_head *list)
 {
-    list->next = list;
+    WRITE_ONCE(list->next, list);
    list->prev = list;
 }

@@ -71,7 +79,7 @@ static inline void __list_add(struct list_head *new,
    next->prev = new;
    new->next  = next;
    new->prev  = prev;
-    prev->next = new;
+    WRITE_ONCE(prev->next, new);
 }

 /**
@@ -111,7 +119,7 @@ static inline void list_add_tail(struct list_head *new, struct list_head *head)
 static inline void __list_del(struct list_head * prev, struct list_head * next)
 {
    next->prev = prev;
-    prev->next = next;
+    WRITE_ONCE(prev->next, next);
 }

 /*
@@ -277,7 +285,7 @@ static inline int list_is_last(const struct list_head *list,
 */
 static inline int list_empty(const struct list_head *head)
 {
-    return head->next == head;
+    return READ_ONCE(head->next) == head;
 }

 /**
@@ -503,7 +511,7 @@ static inline void list_splice_tail_init(struct list_head *list,
 */
 #define list_first_entry_or_null(ptr, type, member) ({                  \
            struct list_head *head__ = (ptr);                           \
-            struct list_head *pos__ = head__->next;                     \
+            struct list_head *pos__ = READ_ONCE(head__->next);          \
            pos__ != head__ ? list_entry(pos__, type, member) : NULL;   \
        })

@@ -779,7 +787,7 @@ static inline int hlist_unhashed(const struct hlist_node *h)
 */
 static inline int hlist_unhashed_lockless(const struct hlist_node *h)
 {
-    return !h->pprev;
+    return !READ_ONCE(h->pprev);
 }

 /**
@@ -788,7 +796,7 @@ static inline int hlist_unhashed_lockless(const struct hlist_node *h)
 */
 static inline int hlist_empty(const struct hlist_head *h)
 {
-    return !h->first;
+    return !READ_ONCE(h->first);
 }

 static inline void __hlist_del(struct hlist_node *n)
@@ -796,9 +804,9 @@ static inline void __hlist_del(struct hlist_node *n)
    struct hlist_node *next = n->next;
    struct hlist_node **pprev = n->pprev;

-    *pprev = next;
+    WRITE_ONCE(*pprev, next);
    if (next)
-        next->pprev = pprev;
+        WRITE_ONCE(next->pprev, pprev);
 }

 /**
@@ -840,11 +848,11 @@ static inline void hlist_del_init(struct hlist_node *n)
 static inline void hlist_add_head(struct hlist_node *n, struct hlist_head *h)
 {
    struct hlist_node *first = h->first;
-    n->next = first;
+    WRITE_ONCE(n->next, first);
    if (first)
-        first->pprev = &n->next;
-    h->first = n;
-    n->pprev = &h->first;
+        WRITE_ONCE(first->pprev, &n->next);
+    WRITE_ONCE(h->first, n);
+    WRITE_ONCE(n->pprev, &h->first);
 }

 /**
@@ -855,10 +863,10 @@ static inline void hlist_add_head(struct hlist_node *n, struct hlist_head *h)
 static inline void hlist_add_before(struct hlist_node *n,
 				    struct hlist_node *next)
 {
-    n->pprev    = next->pprev;
-    n->next     = next;
-    next->pprev = &n->next;
-    *(n->pprev) = n;
+    WRITE_ONCE(n->pprev, next->pprev);
+    WRITE_ONCE(n->next, next);
+    WRITE_ONCE(next->pprev, &n->next);
+    WRITE_ONCE(*(n->pprev), n);
 }

 /**
@@ -869,12 +877,12 @@ static inline void hlist_add_before(struct hlist_node *n,
 static inline void hlist_add_behind(struct hlist_node *n,
 				    struct hlist_node *prev)
 {
-    n->next = prev->next;
-    prev->next = n;
-    n->pprev = &prev->next;
+    WRITE_ONCE(n->next, prev->next);
+    WRITE_ONCE(prev->next, n);
+    WRITE_ONCE(n->pprev, &prev->next);

    if (n->next)
-        n->next->pprev = &n->next;
+        WRITE_ONCE(n->next->pprev, &n->next);
 }

 /**
@@ -953,7 +961,7 @@ static inline void hlist_move_list(struct hlist_head *old,
 #define hlist_for_each_entry(pos, head, member)				\
    for (pos = hlist_entry_safe((head)->first, __typeof__(*(pos)), member); \
         pos;                                                           \
-         pos = hlist_entry_safe((pos)->member.next, typeof(*(pos)), member))
+         pos = hlist_entry_safe((pos)->member.next, __typeof__(*(pos)), member))

 /**
 * hlist_for_each_entry_continue - iterate over a hlist continuing after current point
@@ -961,9 +969,9 @@ static inline void hlist_move_list(struct hlist_head *old,
 * @member:	the name of the hlist_node within the struct.
 */
 #define hlist_for_each_entry_continue(pos, member)			\
-    for (pos = hlist_entry_safe((pos)->member.next, typeof(*(pos)), member); \
+    for (pos = hlist_entry_safe((pos)->member.next, __typeof__(*(pos)), member); \
         pos;                                                           \
-         pos = hlist_entry_safe((pos)->member.next, typeof(*(pos)), member))
+         pos = hlist_entry_safe((pos)->member.next, __typeof__(*(pos)), member))

 /**
 * hlist_for_each_entry_from - iterate over a hlist continuing from current point
@@ -972,7 +980,7 @@ static inline void hlist_move_list(struct hlist_head *old,
 */
 #define hlist_for_each_entry_from(pos, member)				\
    for (; pos;                                                         \
-         pos = hlist_entry_safe((pos)->member.next, typeof(*(pos)), member))
+         pos = hlist_entry_safe((pos)->member.next, __typeof__(*(pos)), member))

 /**
 * hlist_for_each_entry_safe - iterate over list of given type safe against removal of list entry
@@ -982,8 +990,8 @@ static inline void hlist_move_list(struct hlist_head *old,
 * @member:	the name of the hlist_node within the struct.
 */
 #define hlist_for_each_entry_safe(pos, n, head, member) 		\
-    for (pos = hlist_entry_safe((head)->first, typeof(*pos), member);   \
+    for (pos = hlist_entry_safe((head)->first, __typeof__(*pos), member);   \
         pos && ({ n = pos->member.next; 1; });                         \
-         pos = hlist_entry_safe(n, typeof(*pos), member))
+         pos = hlist_entry_safe(n, __typeof__(*pos), member))

-#endif
+#endif  /* __BR_LIST_H */
--- a/c/include/pool.h
+++ b/c/include/pool.h
@@ -0,0 +1,77 @@
+/* pool.h - A simple memory pool manager.
+ *
+ * Copyright (C) 2021 Bruno Raoult ("br")
+ * Licensed under the GNU General Public License v3.0 or later.
+ * Some rights reserved. See COPYING.
+ *
+ * You should have received a copy of the GNU General Public License along with this
+ * program. If not, see <https://www.gnu.org/licenses/gpl-3.0-standalone.html>.
+ *
+ * SPDX-License-Identifier: GPL-3.0-or-later <https://spdx.org/licenses/GPL-3.0-or-later.html>
+ *
+ */
+
+#ifndef POOL_H
+#define POOL_H
+
+#include <stdint.h>
+#include <stddef.h>
+#include "list.h"
+#include "bits.h"
+
+#define POOL_NAME_LENGTH (16)                     /* max name length including trailing \0 */
+
+typedef struct {
+    struct list_head list_blocks;                 /* list of allocated blocks in pool */
+    char data[];                                  /* objects block */
+} block_t;
+
+typedef struct {
+    char name[POOL_NAME_LENGTH];                  /* pool name */
+    u32 available;                                /* current available elements */
+    u32 allocated;                                /* total objects allocated */
+    u32 growsize;                                 /* number of objects per block allocated */
+    size_t eltsize;                               /* object size */
+    u32 nblocks;                                  /* number of blocks allocated */
+    struct list_head list_available;              /* available nodes */
+    struct list_head list_blocks;                 /* allocated blocks */
+} pool_t;
+
+/**
+ * pool_stats - display some pool statistics
+ * @pool:    the pool address.
+ */
+void pool_stats(pool_t *pool);
+
+/**
+ * pool_create - create a new memory pool
+ * @name:    the name to give to the pool.
+ * @grow:    the number of elements to add when no more available.
+ * @size:    the size of an element in pool.
+ */
+pool_t *pool_create(const char *name, u32 grow, size_t size);
+
+/**
+ * pool_get - get an element from a pool
+ * @pool:    the pool address.
+ */
+void *pool_get(pool_t *pool);
+
+/**
+ * pool_add - add (release) an element to a pool
+ * @pool:    the pool address.
+ * @elt:     the address of the object to add to the pool.
+ */
+u32 pool_add(pool_t *pool, void *elt);
+
+/**
+ * pool_destroy - destroy a pool.
+ * @pool:    the pool address.
+ *
+ * Attention: All memory is freed, but no check is done whether all pool
+ * elements has been released. Referencing any pool object after this call
+ * is strongly discouraged.
+ */
+void pool_destroy(pool_t *pool);
+
+#endif
--- a/c/include/rwonce.h
+++ b/c/include/rwonce.h
@@ -0,0 +1,128 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+
+/* adaptation of kernel's <asm-generic/rwonce.h>
+ * See https://www.kernel.org/doc/Documentation/memory-barriers.txt
+ */
+/*
+ * Prevent the compiler from merging or refetching reads or writes. The
+ * compiler is also forbidden from reordering successive instances of
+ * READ_ONCE and WRITE_ONCE, but only when the compiler is aware of some
+ * particular ordering. One way to make the compiler aware of ordering is to
+ * put the two invocations of READ_ONCE or WRITE_ONCE in different C
+ * statements.
+ *
+ * These two macros will also work on aggregate data types like structs or
+ * unions.
+ *
+ * Their two major use cases are: (1) Mediating communication between
+ * process-level code and irq/NMI handlers, all running on the same CPU,
+ * and (2) Ensuring that the compiler does not fold, spindle, or otherwise
+ * mutilate accesses that either do not require ordering or that interact
+ * with an explicit memory barrier or atomic instruction that provides the
+ * required ordering.
+ */
+#ifndef __BR_RWONCE_H
+#define __BR_RWONCE_H
+
+/************ originally in <include/linux/compiler_attributes.h> */
+#if __has_attribute(__error__)
+# define __compiletime_error(msg)       __attribute__((__error__(msg)))
+#else
+# define __compiletime_error(msg)
+#endif
+
+/************ originally in <include/linux/compiler_types.h> */
+/*
+ * __unqual_scalar_typeof(x) - Declare an unqualified scalar type, leaving
+ *                             non-scalar types unchanged.
+ */
+/*
+ * Prefer C11 _Generic for better compile-times and simpler code. Note: 'char'
+ * is not type-compatible with 'signed char', and we define a separate case.
+ */
+#define __scalar_type_to_expr_cases(type)                               \
+    unsigned type:  (unsigned type)0,                                   \
+    signed type:    (signed type)0
+
+#define __unqual_scalar_typeof(x)                                       \
+    typeof(_Generic((x),                                                \
+                    char:  (char)0,                                     \
+                    __scalar_type_to_expr_cases(char),                  \
+                    __scalar_type_to_expr_cases(short),                 \
+                    __scalar_type_to_expr_cases(int),                   \
+                    __scalar_type_to_expr_cases(long),                  \
+                    __scalar_type_to_expr_cases(long long),             \
+                    default: (x)))
+
+/* Is this type a native word size -- useful for atomic operations */
+#define __native_word(t) \
+    (sizeof(t) == sizeof(char) || sizeof(t) == sizeof(short) || \
+     sizeof(t) == sizeof(int) || sizeof(t) == sizeof(long))
+
+#ifdef __OPTIMIZE__
+# define __compiletime_assert(condition, msg, prefix, suffix)           \
+    do {                                                                \
+        extern void prefix ## suffix(void) __compiletime_error(msg);    \
+        if (!(condition))                                               \
+            prefix ## suffix();                                         \
+    } while (0)
+#else
+# define __compiletime_assert(condition, msg, prefix, suffix) do { } while (0)
+#endif
+
+#define _compiletime_assert(condition, msg, prefix, suffix) \
+    __compiletime_assert(condition, msg, prefix, suffix)
+
+/**
+ * compiletime_assert - break build and emit msg if condition is false
+ * @condition: a compile-time constant condition to check
+ * @msg:       a message to emit if condition is false
+ *
+ * In tradition of POSIX assert, this macro will break the build if the
+ * supplied condition is *false*, emitting the supplied error message if the
+ * compiler has support to do so.
+ */
+#define compiletime_assert(condition, msg)                              \
+    _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
+
+#define compiletime_assert_atomic_type(t)                               \
+    compiletime_assert(__native_word(t),                                \
+                       "Need native word sized stores/loads for atomicity.")
+
+/************ originally in <asm-generic/rwonce.h> */
+/*
+ * Yes, this permits 64-bit accesses on 32-bit architectures. These will
+ * actually be atomic in some cases (namely Armv7 + LPAE), but for others we
+ * rely on the access being split into 2x32-bit accesses for a 32-bit quantity
+ * (e.g. a virtual address) and a strong prevailing wind.
+ */
+#define compiletime_assert_rwonce_type(t)                                  \
+    compiletime_assert(__native_word(t) || sizeof(t) == sizeof(long long), \
+                       "Unsupported access size for {READ,WRITE}_ONCE().")
+
+/*
+ * Use __READ_ONCE() instead of READ_ONCE() if you do not require any
+ * atomicity. Note that this may result in tears!
+ */
+#ifndef __READ_ONCE
+#define __READ_ONCE(x)  (*(const volatile __unqual_scalar_typeof(x) *)&(x))
+#endif
+
+#define READ_ONCE(x)                                                    \
+({                                                                      \
+    compiletime_assert_rwonce_type(x);                                  \
+    __READ_ONCE(x);                                                     \
+})
+
+#define __WRITE_ONCE(x, val)                                            \
+do {                                                                    \
+    *(volatile typeof(x) *)&(x) = (val);                                \
+} while (0)
+
+#define WRITE_ONCE(x, val)                                              \
+do {                                                                    \
+    compiletime_assert_rwonce_type(x);                                  \
+    __WRITE_ONCE(x, val);                                               \
+} while (0)
+
+#endif  /* __BR_RWONCE_H */
--- a/c/pool.c
+++ b/c/pool.c
@@ -0,0 +1,225 @@
+/* pool.c - A simple pool manager.
+ *
+ * Copyright (C) 2021 Bruno Raoult ("br")
+ * Licensed under the GNU General Public License v3.0 or later.
+ * Some rights reserved. See COPYING.
+ *
+ * You should have received a copy of the GNU General Public License along with this
+ * program. If not, see <https://www.gnu.org/licenses/gpl-3.0-standalone.html>.
+ *
+ * SPDX-License-Identifier: GPL-3.0-or-later <https://spdx.org/licenses/GPL-3.0-or-later.html>
+ *
+ */
+
+#include <stddef.h>
+#include <malloc.h>
+#include <string.h>
+#include <stdlib.h>
+#include <errno.h>
+
+#include "list.h"
+#include "pool.h"
+#include "debug.h"
+#include "bits.h"
+
+void pool_stats(pool_t *pool)
+{
+    if (pool) {
+#       ifdef DEBUG_POOL
+        block_t *block;
+
+        log_f(1, "[%s] pool [%p]: blocks:%u avail:%u alloc:%u grow:%u eltsize:%lu\n",
+              pool->name, (void *)pool, pool->nblocks, pool->available, pool->allocated,
+              pool->growsize, pool->eltsize);
+        log(5, "\tblocks: ");
+        list_for_each_entry(block, &pool->list_blocks, list_blocks) {
+            log(5, "%p ", block);
+        }
+        log(5, "\n");
+#       endif
+    }
+}
+
+pool_t *pool_create(const char *name, u32 growsize, size_t eltsize)
+{
+    pool_t *pool;
+
+#   ifdef DEBUG_POOL
+    log_f(1, "name=[%s] growsize=%u eltsize=%lu\n",
+          name, growsize, eltsize);
+#   endif
+    /* we need at least  sizeof(struct list_head) space in pool elements
+     */
+    if (eltsize < sizeof (struct list_head)) {
+#       ifdef DEBUG_POOL
+        log_f(1, "[%s]: structure size too small (%lu < %lu), adjusting to %lu.\n",
+              name, eltsize, sizeof(struct list_head), sizeof(struct list_head));
+#       endif
+        eltsize = sizeof(struct list_head);
+    }
+    if ((pool = malloc(sizeof (*pool)))) {
+        strncpy(pool->name, name, POOL_NAME_LENGTH - 1);
+        pool->name[POOL_NAME_LENGTH - 1] = 0;
+        pool->growsize = growsize;
+        pool->eltsize = eltsize;
+        pool->available = 0;
+        pool->allocated = 0;
+        pool->nblocks = 0;
+        INIT_LIST_HEAD(&pool->list_available);
+        INIT_LIST_HEAD(&pool->list_blocks);
+    }
+    return pool;
+}
+
+static u32 _pool_add(pool_t *pool, struct list_head *elt)
+{
+#   ifdef DEBUG_POOL
+    log_f(6, "pool=%p &head=%p elt=%p off1=%lu off2=%lu\n",
+          (void *)pool,
+          (void *)&pool->list_available,
+          (void *)elt,
+          (void *)&pool->list_available-(void *)pool,
+          offsetof(pool_t, list_available));
+#   endif
+
+    list_add(elt, &pool->list_available);
+    return ++pool->available;
+}
+
+u32 pool_add(pool_t *pool, void *elt)
+{
+    return _pool_add(pool, elt);
+}
+
+static struct list_head *_pool_get(pool_t *pool)
+{
+    struct list_head *res = pool->list_available.next;
+    pool->available--;
+    list_del(res);
+    return res;
+}
+
+void *pool_get(pool_t *pool)
+{
+    if (!pool)
+        return NULL;
+    if (!pool->available) {
+        block_t *block = malloc(sizeof(block_t) + pool->eltsize * pool->growsize);
+        void *cur;
+        u32 i;
+
+        if (!block) {
+#           ifdef DEBUG_POOL
+            log_f(1, "[%s]: failed block allocation\n", pool->name);
+#           endif
+            errno = ENOMEM;
+            return NULL;
+        }
+
+        /* maintain list of allocated blocks
+         */
+        list_add(&block->list_blocks, &pool->list_blocks);
+        pool->nblocks++;
+
+#       ifdef DEBUG_POOL
+        log_f(1, "[%s]: growing pool from %u to %u elements. block=%p nblocks=%u\n",
+              pool->name,
+              pool->allocated,
+              pool->allocated + pool->growsize,
+              block,
+              pool->nblocks);
+#       endif
+
+        pool->allocated += pool->growsize;
+        for (i = 0; i < pool->growsize; ++i) {
+            cur = block->data + i * pool->eltsize;
+#           ifdef DEBUG_POOL
+            log_f(7, "alloc=%p cur=%p\n", block, cur);
+#           endif
+            _pool_add(pool, (struct list_head *)cur);
+        }
+        //pool_stats(pool);
+    }
+    /* this is the effective address if the object (and also the
+     * pool list_head address)
+     */
+    return _pool_get(pool);
+}
+
+void pool_destroy(pool_t *pool)
+{
+    block_t *block, *tmp;
+    if (!pool)
+        return;
+    /* release memory blocks */
+#   ifdef DEBUG_POOL
+    log_f(1, "[%s]: releasing %d blocks and main structure\n", pool->name, pool->nblocks);
+    log(5, "blocks:");
+#   endif
+    list_for_each_entry_safe(block, tmp, &pool->list_blocks, list_blocks) {
+        list_del(&block->list_blocks);
+        free(block);
+#       ifdef DEBUG_POOL
+        log(5, " %p", block);
+#       endif
+    }
+#   ifdef DEBUG_POOL
+    log(5, "\n");
+#   endif
+    free(pool);
+}
+
+#ifdef BIN_pool
+struct d {
+    u16 data1;
+    char c;
+    struct list_head list;
+};
+
+static LIST_HEAD (head);
+
+int main(int ac, char**av)
+{
+    pool_t *pool;
+    int total;
+    int action=0;
+    u16 icur=0;
+    char ccur='z';
+    struct d *elt;
+
+    debug_init(3);
+    log_f(1, "%s: sizeof(d)=%lu sizeof(*d)=%lu off=%lu\n", *av, sizeof(elt),
+          sizeof(*elt), offsetof(struct d, list));
+
+    if ((pool = pool_create("dummy", 3, sizeof(*elt)))) {
+        pool_stats(pool);
+        for (int cur=1; cur<ac; ++cur) {
+            total = atoi(av[cur]);
+            if (action == 0) {                    /* add elt to list */
+                log_f(2, "adding %d elements\n", total);
+                for (int i = 0; i < total; ++i) {
+                    elt = pool_get(pool);
+                    elt->data1 = icur++;
+                    elt->c = ccur--;
+                    list_add(&elt->list, &head);
+                }
+                pool_stats(pool);
+                action = 1;
+            } else {                              /* remove one elt from list */
+                log_f(2, "deleting %d elements\n", total);
+                for (int i = 0; i < total; ++i) {
+                    if (!list_empty(&head)) {
+                        elt = list_last_entry(&head, struct d, list);
+                        printf("elt=[%d, %c]\n", elt->data1, elt->c);
+                        list_del(&elt->list);
+                        pool_add(pool, elt);
+                    }
+                }
+                pool_stats(pool);
+                action = 0;
+            }
+        }
+    }
+    pool_stats(pool);
+}
+#endif
Author	SHA1	Message	Date
Bruno Raoult	05e7ecb5e1	replace all "function foo" with "foo()"	2022-06-23 19:20:47 +02:00
Bruno Raoult	54e9308268	Use only labels for partition matching	2022-06-23 19:13:07 +02:00
Bruno Raoult	5ef543f760	change shebang line	2022-06-23 16:23:38 +02:00
Bruno Raoult	7a8b6cdc73	dup-live-disk: RSYNCOPTS is now array, ignore exit 24 for rsync	2022-06-20 13:08:29 +02:00
Bruno Raoult	f4f6bd06d1	C tools: move includes to subdir, Makefile	2022-06-06 16:45:07 +02:00
Bruno Raoult	9d71467182	rwonce.h: __error__ attribute fix	2022-06-01 17:55:48 +02:00
Bruno Raoult	d6eccb2caa	bits.h: add 32 bits macros	2022-06-01 17:54:01 +02:00
Bruno Raoult	97aea8ddf2	sync.sh: some shellcheck fixes	2022-06-01 17:46:57 +02:00
Bruno Raoult	fab41ccc2e	debug.h: typos	2022-06-01 17:46:17 +02:00
Bruno Raoult	124192efbf	bufix in example (wrong quotes)	2022-05-29 19:07:22 +02:00
Bruno Raoult	bda4253cc1	sync.sh: More errors checks	2022-05-29 18:14:47 +02:00
Bruno Raoult	71ea8e5881	sync.sh: remove FILTER variable	2022-05-27 21:54:51 +02:00
Bruno Raoult	f55e565aac	dup-live-disk.sh: cosmetic changes	2022-05-27 21:54:28 +02:00
Bruno Raoult	607c9495d7	sync.sh: Touch destination dir after copy	2022-05-15 09:53:36 +02:00
Bruno Raoult	94b48bbfef	sync.sh: update options in man section	2022-05-14 10:24:41 +02:00
Bruno Raoult	909f4bb2ca	sync.sh: Fix wrong log file name, add its name on top of email	2022-05-14 10:12:30 +02:00
Bruno Raoult	8dad65dd90	sync.sh: different exit status, better locking, etc... * -l option to keep log file * lock files are now in /tmp * no sendmail will give better information about issue * checks for SRC and DST dirs before backup	2022-05-13 20:09:52 +02:00
Bruno Raoult	6df830554d	sync.sh: refactoring, add -m option	2022-05-11 15:29:24 +02:00
Bruno Raoult	28780ef13c	sync.sh: add some code in functions	2022-05-10 20:38:34 +02:00
Bruno Raoult	9ea7e38759	sync.sh: cosmetic changes after first tests...	2022-05-10 14:14:01 +02:00
Bruno Raoult	fec8a1e844	sync.sh: phase 1 of full rewrite (functions, etc...) Important changes: - RSYNCOPTS must be an array, not a string. - log() is now using printf-style: Unchanged: - log "a b c" Incorrect (old syntax): - log a b c Correct (new syntax): - log "%s %s %s" "a" "b "c" - log "%s" "a b c"	2022-05-09 17:23:53 +02:00
Bruno Raoult	f8c150f2a3	dup-live-disk: fix mismatched quotes help text	2022-05-08 13:16:57 +02:00
Bruno Raoult	b040a772e7	dup-live-disk: Typo in 'man' text which gives an error at EOF	2022-05-07 20:23:21 +02:00
Bruno Raoult	3387c26a22	dup-live-disk: typo when asking to install grub	2022-05-07 20:12:59 +02:00
Bruno Raoult	6dbcf82f0b	sync.sh: -a option parameters do not use comma as separator	2022-04-30 14:30:19 +02:00
Bruno Raoult	a08903e55e	sync.sh: RSYNCOPTS is now an array	2022-04-27 21:53:58 +02:00
Bruno Raoult	92d1be28af	sync.sh: replace -dwmy with -ad,w,m,y (INVOCATION CHANGE !)	2022-04-27 20:45:43 +02:00
Bruno Raoult	6cea21099d	BUG fix: type -P instead of type -p to check command is in PATH	2022-04-26 16:10:09 +02:00
Bruno Raoult	f623bfe80c	use gzip by default if available. Fix sendmail To: envelope	2022-04-25 14:52:00 +02:00
Bruno Raoult	159e70d654	sync.sh: use gzip by default if available. Fix sendmail To: envelope	2022-04-25 14:04:41 +02:00
Bruno Raoult	5a93fe6b47	sync.sh: Minor changes	2022-04-24 21:07:18 +02:00
Bruno Raoult	3699e9f9eb	sync.sh: remove uuidgen dependancy (static MIME string)	2022-04-23 13:37:55 +02:00
Bruno Raoult	1b818570c2	sync.sh: Use sendmail to send email.	2022-04-22 14:04:47 +02:00
Bruno Raoult	1f6a506af4	sync.sh: new option to gzip mail attachment	2022-04-22 10:39:17 +02:00
Bruno Raoult	38dd2d87ed	switch from uuencode to base64	2022-04-22 10:05:43 +02:00
Bruno Raoult	bda790702f	sync.sh: minor logging changes	2022-04-21 20:34:37 +02:00
Bruno Raoult	93f7075275	Shellcheck compliance	2022-04-21 16:39:13 +02:00
Bruno Raoult	546d4afeaf	typo	2022-04-21 16:23:09 +02:00
Bruno Raoult	f8dc759b6a	sync.sh: mail output is sent as attachment	2022-04-21 16:20:25 +02:00
Bruno Raoult	045787a135	remove redundant _printf declaration	2022-04-21 16:18:17 +02:00
Bruno Raoult	7071dc5725	rwonce.h: indent; bits.h: remove useless convenience signed types	2022-03-18 18:46:10 +01:00
Bruno Raoult	52cf521da4	add READ_ONCE() and WRITE_ONCE()	2022-03-18 16:53:43 +01:00
Bruno Raoult	1b648d6db2	bits.h: added convenience types	2022-03-18 14:23:49 +01:00
Bruno Raoult	b5aa787fb4	add rwonce.h	2022-03-18 13:43:34 +01:00
Bruno Raoult	a248db691c	dup-live-disk.sh: hack for failed umount	2022-03-10 08:04:34 +01:00
Bruno Raoult	eae78e0422	add some autofs configuration hints	2022-03-08 13:35:02 +01:00
Bruno Raoult	22185486b6	Change license to GPL 3.0 or later	2022-03-08 12:29:55 +01:00
Bruno Raoult	98a6d550a8	typo	2022-03-08 12:02:27 +01:00
Bruno Raoult	504f8546d0	dup-live.sh: added --man examples	2022-03-08 12:00:57 +01:00
Bruno Raoult	2aadd7bc51	dup-live-disk.sh: change some messages, echorun() -> echorun_maybe()	2022-03-08 11:46:40 +01:00
Bruno Raoult	78dc9f765f	fix for yesno() function	2022-03-08 09:39:36 +01:00
Bruno Raoult	55f93efa75	typos	2022-03-07 20:45:23 +01:00
Bruno Raoult	9b9e22c426	dup-disk.sh: add actions (--yes, --no, --grub, --copy, --fstab, ...)	2022-03-07 20:14:08 +01:00
Bruno Raoult	ab789d8ba7	add #error for wordsize != 64	2022-02-07 18:20:32 +01:00
Bruno Raoult	294e6dbbcb	bugfix bit_for_each64_2	2022-01-29 15:48:42 +01:00
Bruno Raoult	f8a13b807e	debug.h: add __attribute__ to debug(), for printf() args style	2022-01-16 21:22:10 +01:00
Bruno Raoult	76a6a81d69	pool_create: do not fail if structure is too small to handle list pointers	2022-01-16 21:10:41 +01:00
Bruno Raoult	78d76a1add	list.h: updated from advent of code repo	2022-01-16 21:02:16 +01:00
Bruno Raoult	14f4304b94	add debug, bits, and pool	2021-12-20 15:16:16 +01:00
Bruno Raoult	2ec32cbecf	revert from C99 to kernel-style	2021-09-05 21:43:14 +02:00
Bruno Raoult	443e3e3702	Merge branch 'dev'	2021-09-04 17:52:26 +02:00
Bruno Raoult	7c23bd43b7	Merge branch 'dev'	2021-04-30 15:55:03 +02:00
Bruno Raoult	a773e61b56	Merge branch 'dev'	2021-04-30 14:29:01 +02:00