75 lines
2.7 KiB
Bash
75 lines
2.7 KiB
Bash
#!/usr/bin/env bash
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# Make backup my system with restic to Backblaze B2.
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# This script is typically run by: /etc/systemd/system/restic-backup.{service,timer}
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# Exit on failure, pipe failure
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set -e -o pipefail
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source /etc/restic/env.sh
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# Clean up lock if we are killed.
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# If killed by systemd, like $(systemctl stop restic), then it kills the whole cgroup and all it's subprocesses.
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# However if we kill this script ourselves, we need this trap that kills all subprocesses manually.
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exit_hook() {
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echo "In exit_hook(), being killed" >&2
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jobs -p | xargs kill
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restic unlock
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}
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trap exit_hook INT TERM
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# How many backups to keep.
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RETENTION_DAYS=14
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RETENTION_WEEKS=16
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RETENTION_MONTHS=18
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RETENTION_YEARS=3
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BACKUP_TAG=systemd.timer
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# Set all environment variables like
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# B2_ACCOUNT_ID, B2_ACCOUNT_KEY, RESTIC_REPOSITORY etc.
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#source /etc/restic/b2_env.sh
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# How many network connections to set up to B2. Default is 5.
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B2_CONNECTIONS=50
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# NOTE start all commands in background and wait for them to finish.
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# Reason: bash ignores any signals while child process is executing and thus my trap exit hook is not triggered.
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# However if put in subprocesses, wait(1) waits until the process finishes OR signal is received.
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# Reference: https://unix.stackexchange.com/questions/146756/forward-sigterm-to-child-in-bash
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# Remove locks from other stale processes to keep the automated backup running.
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restic unlock &
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wait $!
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# Do the backup!
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# See restic-backup(1) or http://restic.readthedocs.io/en/latest/040_backup.html
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# --one-file-system makes sure we only backup exactly those mounted file systems specified in $BACKUP_PATHS, and thus not directories like /dev, /sys etc.
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# --tag lets us reference these backups later when doing restic-forget.
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restic backup --verbose --tag $BACKUP_TAG $BACKUP_EXCLUDES $BACKUP_PATHS &
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wait $!
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# Dereference old backups.
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# See restic-forget(1) or http://restic.readthedocs.io/en/latest/060_forget.html
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# --group-by only the tag and path, and not by hostname. This is because I create a B2 Bucket per host, and if this hostname accidentially change some time, there would now be multiple backup sets.
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restic forget \
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--verbose \
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--tag $BACKUP_TAG \
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--group-by "paths,tags" \
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--keep-daily $RETENTION_DAYS \
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--keep-weekly $RETENTION_WEEKS \
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--keep-monthly $RETENTION_MONTHS \
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--keep-yearly $RETENTION_YEARS &
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wait $!
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# Remove old data not linked anymore.
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# See restic-prune(1) or http://restic.readthedocs.io/en/latest/060_forget.html
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restic prune --verbose &
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wait $!
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# Check repository for errors.
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# NOTE this takes much time (and data transfer from remote repo?), do this in a separate systemd.timer which is run less often.
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#restic check &
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#wait $!
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echo "Backup & cleaning is done."
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