109 lines
2.4 KiB
Bash
Executable file
109 lines
2.4 KiB
Bash
Executable file
#!/bin/bash
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# dir to backup
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cd $(dirname $0)
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usage() {
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echo "backup script with snapshots"
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echo "$0 [-x exclude dir] [-k N] <backup dir>"
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echo
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echo " -x excludes sub directory"
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echo " -k defines how many snapshots to keep (default 7)"
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echo " -q supress verbose output"
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echo
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}
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# read configuration variables
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source config.sh
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BDIR=""
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EXCLUDE=""
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#### READ PARAMETERS
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while getopts ":x:hqk:" opt; do
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case $opt in
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x)
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EXCLUDE="${EXCLUDE} --exclude ${SNAPSHOTDIR}/${OPTARG}"
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;;
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h)
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usage
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exit 0
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;;
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q)
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QUIET="--quiet"
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;;
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k)
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KEEPLAST="${OPTARG}"
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;;
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\?)
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echo "ERROR: Invalid option: -$OPTARG" >&2
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usage
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exit 1
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;;
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:)
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echo "ERROR: Option -$OPTARG requires an argument." >&2
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usage
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exit 1
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;;
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esac
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done
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shift $((OPTIND-1))
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BDIR=${1}
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if [ -z "$BDIR" ]; then
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echo "ERROR: Missing backup directory!" >&2
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usage
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exit 2
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fi
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#### END READ PARAMETERS
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# umount and close everything if it is mounted before
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uuid=$(cat /proc/sys/kernel/random/uuid)
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if ! ./lock.sh haslock; then
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umount -v $SNAPSHOTDIR
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cryptsetup close snapshot-decrypt
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lvremove -f vg01/crypt-snapshot
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mkdir -p $SNAPSHOTDIR
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# create snapshot of data volume
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sync
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lvcreate -l100%FREE -s -n crypt-snapshot /dev/vg01/data-crypt || exit 1
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# decrypt snapshot with key on unencrypted partition
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echo mounting snapshot
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cryptsetup open --type luks --key-file /data/_lukskeyfile /dev/vg01/crypt-snapshot snapshot-decrypt || exit 2
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# mount the freshly decrypted backup
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mount -o ro /dev/mapper/snapshot-decrypt $SNAPSHOTDIR || exit 3
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fi
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./lock.sh lock $uuid
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export RESTIC_PASSWORD=${BACKUP_PASSWORD}
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echo "Backup path: $SNAPSHOTDIR/$BDIR"
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# backup the snapshot (without freezing the filesystem)
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# use -q for quiet mode (when run as a cron job)
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ionice -c 3 $RESTIC --repo $URI $EXCLUDE $QUIET backup $SNAPSHOTDIR/$BDIR
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./lock.sh unlock $uuid
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if ! ./lock.sh haslock; then
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# at this point we no longer need the snapshot and can unmount it
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umount $SNAPSHOTDIR
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cryptsetup close snapshot-decrypt
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lvremove -f vg01/crypt-snapshot
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fi
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# delete everything older than the last X snapshots
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$RESTIC --repo $URI $QUIET forget --keep-last $KEEPLAST --path "$SNAPSHOTDIR/$BDIR"
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unset RESTIC_PASSWORD
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exit 0
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