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94 lines
2.8 KiB
94 lines
2.8 KiB
#!/bin/bash -e |
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BTRFS_VOLUMES=${BTRFS_VOLUMES:-$(awk '!/^#/ && $3=="btrfs" {print $2}' /etc/fstab | tr '\n' ' ' | sed 's, $,,')} |
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TMP_MNT=${TMP_MNT:-/var/tmp/btrfs-backup} |
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vols=() |
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del= |
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dryrun=0 |
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while test $# -gt 0; do |
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case "$1" in |
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(-h|--help) cat <<EOF |
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$0 [OPTIONS] |
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OPTIONS |
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-h, --help show this help |
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-n, --dry-run execute dry run, do not backup, just show commands |
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-p, --path <path> add a path that contains a btrfs (sub-) volume |
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(defaults to: ${BTRFS_VOLUMES}) |
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-m, --mnt <path> temporary mount point (default: ${TMP_MNT}) |
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not yet implemented: |
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-d, --del <days> delete snapshots older than given number of days |
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ENVIRONMENT |
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BTRFS_VOLUMES specify all volume pathes (instead of -p) |
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TMP_MNT temporary mount point (instead of -m) |
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DESCRIPTION |
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Creates a snapshot for all btrfs volumes specified. Snapshot is named |
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from the subvol name or if there is no subvol, from the path by |
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appending -snapshot-YYYY-MM-DD-HH-mm. |
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EOF |
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exit;; |
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(-n|--dry-run) dryrun=1;; |
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(-p|--path) shift; vols+=( "$1" );; |
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(-m|--mnt) shift; TMP_MNT="$1";; |
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(-d|--del) shift; del="$1";; |
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(*) echo "ERROR: unknown option $1, try $0 --help" 1>&2 |
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exit 1;; |
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esac |
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if test $# -lt 1; then |
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echo "ERROR: missing argument, try $0 --help" 1>&2 |
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exit 1 |
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fi |
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shift |
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done |
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if test -n "${vols[*]}"; then |
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BTRFS_VOLUMES="${vols[*]}" |
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fi |
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test -d "${TMP_MNT}" || mkdir -p "${TMP_MNT}" |
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for fs in ${BTRFS_VOLUMES}; do |
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device=$(mount | awk '$3=="'$fs'" && $5=="btrfs" {print $1}') |
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subvol=$(mount | awk '$3=="'$fs'" && $5=="btrfs" {split(substr($6, 2, length($6)-2), res, ","); for (r in res) {if (res[r]~/^subvol=/) {sub(/^subvol=/,"" , res[r]); print res[r]}}}') |
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if test -n "$subvol"; then |
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if test "$subvol" = "/@"; then |
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name=${subvol} |
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else |
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name=${subvol}- |
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fi |
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else |
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if test "$fs" = "/"; then |
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name="/" |
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else |
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name=${fs#/} |
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name=${name%/} |
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name=/${name//\//-}- |
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fi |
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fi |
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target="${name}snapshot-$(date +%Y-%m-%d-%H-%M)" |
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if test -n "$device"; then |
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if test $dryrun -eq 1; then |
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echo -e "→ \e[1mbackup ${subvol:+subvol $subvol of }$fs on $device\e[0m" |
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echo " " mount "$device" "$TMP_MNT" |
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echo " " btrfs subvolume snapshot "${TMP_MNT}${subvol}" "${TMP_MNT}${target}" |
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echo " " umount "$TMP_MNT" |
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else |
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if mount | grep -q " on $TMP_MNT type "; then |
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sudo umount "$TMP_MNT" |
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fi |
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sudo mount "$device" "$TMP_MNT" |
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sudo btrfs subvolume snapshot "${TMP_MNT}${subvol}" "${TMP_MNT}${target}" |
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sudo umount "$TMP_MNT" |
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fi |
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else |
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echo "ERROR: no device found for $fs" 1>&2 |
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exit 2 |
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fi |
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done
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