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83 lines
2.5 KiB
83 lines
2.5 KiB
7 years ago
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#!/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 $0 --help" 1>&2
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exit 1
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fi
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shift
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done
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BTRFS_VOLUMES=${BTRFS_VOLUMES:-$(awk '!/^#/ && $3=="btrfs" {print $2}' /etc/fstab)}
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TMP_MNT=${TMP_MNT:-/var/tmp/btrfs-backup}
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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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name=${subvol}
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else
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if test "$fs" = "/"; then
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name="@root"
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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 $dryrun -eq 1; then
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echo btrfs subvolume snapshot "${TMP_MNT}${subvol}" "${TMP_MNT}/${target}"
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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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done
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