reorg and new lizardfs-snapshots.sh

lizardfs/README.md

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+LizardFS Snapshots And Backups
+==============================
+
+Creates a lizardfs snapshot of all sources to a destination. If
+`--del` is specified, only the given number of snapshots is kept,
+older snapshots are deleted.
+
+To create regular snapshots on a daily base, just run:
+
+    sudo cp btrfs-snapshots.sh /etc/cron.daily/btrfs-snapshots
+
+If `lizardfs-snapshots` is run from a `cron.daily`, `cron.hourly`,
+`cron. monthly` or `cron.weekly` directory, the periodity is
+automatically appended to the snapshot name, and the expiry is set
+meaningfull. Otherwise the name is `manual` and nothing is expired by
+default.
+
+You can create a configuration file, specifiying some defaults,
+e.g. `/etc/lizardfs-snapshots.conf`:
+
+    SOURCES=( /var/volumes/configs /var/volumes/volumes )
+    DESTINATION=/var/volumes/backup/snapshots
+    MONTHLY_DEL=13
+
+Try: `lizardfs-snapshots.sh --help`

lizardfs/lizsrdfs-snapshots.sh

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+#!/bin/bash -e
+
+# defaults
+HOURLY_DEL=25
+DAILY_DEL=8
+WEEKLY_DEL=5
+MONTHLY_DEL=
+SOURCES=()
+DESTINATION=
+
+# overwrite defaults in configs
+if test -e /etc/lizardfs-snapshots.conf; then
+    . /etc/lizardfs-snapshots.conf
+fi
+if test -e ~/.lizardfs-snapshots; then
+    . ~/.lizrdfs-snapshots
+fi
+
+# evaluate commandline
+del=
+periodity=${0%/*}
+periodity=${periodity##*/}
+if [[ $periodity =~ ^cron\... ]]; then
+    periodity=${periodity#cron}
+else
+    periodity=
+fi
+
+case "$periodity" in
+    (.hourly) del=${HOURLY_DEL};;
+    (.daily) del=${DAILY_DEL};;
+    (.weekly) del=${WEEKLY_DEL};;
+    (.monthly) del=${MONTHLY_DEL};;
+    (*) periodity=".manual";;
+esac
+while test $# -gt 0; do
+    case "$1" in
+        (-h|--help) cat <<EOF
+$0 [OPTIONS] [[SOURCES...] DESTINATION]
+
+OPTIONS
+
+  -h, --help           show this help
+  -n, --dry-run        execute dry run, do not backup, just show commands
+  -d, --del <number>   delete old snapshots beginning at <numbers>-th
+
+CONFIGURATION FILE
+
+You can have a configuration file lizardfs-snapshots.conf either in /etc or in your home.
+
+This may define the following bash variables:
+  HOURLY_DEL, DAILY_DEL, WEEKLY_DEL, MONTHLY_DEL 
+                       defining the parameter --del for hourly, daily, weekly, monthly 
+  SOURCES              bash array that defines the sources to backup
+  DESTINATION          snapshot target path
+
+DESCRIPTION
+
+To create regular snapshots on a daily base, just run:
+
+  sudo cp lizardfs-snapshots.sh /etc/cron.daily/lizardfs-snapshots
+
+If lizardfs-snapshots is run from a cron.daily, cron.hourly,
+cron. monthly or cron.weekly directory, the periodity is automatically
+appended to the snapshot name, and the expiry is set meaningfull:
+
+  - hourly  → keep only 24 hours, --del 25
+  - daily   → keep only 7 days, --del 8
+  - weekly  → keep only 4 weeks, --del 5
+  - monthly → old snapshots are not deleted
+
+EOF
+                    exit;;
+        (-n|--dry-run) dryrun=1;;
+        (-d|--del) shift; del="$1";;
+        (*) break;;
+    esac
+    if test $# -lt 1; then
+        echo "ERROR: missing argument, try $0 --help" 1>&2
+        exit 1
+    fi
+    shift
+done
+while test $# -gt 1; do
+    SOURCES+=("$1")
+    shift
+done
+if test $# -eq 1; then
+    DESTINATION="$1"
+fi
+if test -z "${SOURCES[*]}"; then
+    echo "ERROR: no sources specified, try $0 --help" 1>&2
+    exit 1
+fi
+if test -z "${DESTINATION}"; then
+    echo "ERROR: no destination specified, try $0 --help" 1>&2
+    exit 1
+fi
+if $dryrun -eq 0 && ! ( test -d "${DESTINATION}" || mkdir -p "${DESTINATION}" ); then
+    echo "ERROR:  cannot create destination path '$DESTINATION', try $0 --help" 1>&2
+    exit 1
+fi
+date="-$(date +%Y-%m-%d-%H-%M)"
+for src in "${SOURCES[@]}"; do
+    target="${src##*/}${periodity}"
+    if test $dryrun -eq 1; then
+        echo -e "→ \e[1mbackup $src\e[0m"
+        echo " " "lizardfs snapshot '${src}' '${DESTINATION}/${target}${date}'"
+        if test -n "$del"; then
+            for f in $(ls -d1 "${DESTINATION}/${target}"-* | sort -r | tail -n +"$del"); do
+                echo " " "rm -rf '$f'"
+            done
+	fi
+    else
+        echo -e "→ \e[1mbackup $src\e[0m"
+        lizardfs snapshot "${src}" "${DESTINATION}/${target}${date}"
+        if test -n "$del"; then
+            for f in $(ls -d1 "${DESTINATION}/${target}"-* | sort -r | tail -n +"$del"); do
+                rm -rf "$f"
+            done
+        fi
+    fi
+done