master
Marc Wäckerlin 7 years ago
parent 8a76f6b4f0
commit 33eb0a20d1
  1. 13
      README.md
  2. 82
      btrfs-snapshots.sh

@ -1,3 +1,12 @@
# btrfs-backup Use BTRFS Snapshots For Backups
===============================
Scripts for using btrfs snapshot feature in backups. Try: btrfs-snapshots.sh --help
Setup daily btrfs snapshot of all mounted subvols in `/etc/fstab`:
sudo cp btrfs-snapshots.sh /etc/cron.daily/btrfs-snapshots
If you want hourly bakups, just enter:
sudo cp btrfs-snapshots.sh /etc/cron.hourly/btrfs-snapshots

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