101 lines
2.6 KiB
Bash
101 lines
2.6 KiB
Bash
#!/bin/bash -ue
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# The udev rule is not terribly accurate and may trigger our service before
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# the kernel has finished probing partitions. Sleep for a bit to ensure
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# the kernel is done.
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#
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# This can be avoided by using a more precise udev rule, e.g. matching
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# a specific hardware path and partition.
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sleep 5
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#
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# Script configuration
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#
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# The backup partition is mounted there
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MOUNTPOINT=/mnt
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# This is the location of the Borg repository
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TARGET=$MOUNTPOINT/Combava
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# Archive name schema
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DATE=$(date --iso-8601)-$(hostname)
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# This is the file that will later contain UUIDs of registered backup drives
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DISKS=/etc/backups/backup.disks
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# Find whether the connected block device is a backup drive
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for uuid in $(lsblk --noheadings --list --output uuid)
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do
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if grep --quiet --fixed-strings $uuid $DISKS; then
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break
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fi
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uuid=
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done
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if [ ! $uuid ]; then
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echo "No backup disk found, exiting"
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exit 0
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fi
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echo "Disk $uuid is a backup disk"
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partition_path=/dev/disk/by-uuid/$uuid
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# Mount file system if not already done. This assumes that if something is already
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# mounted at $MOUNTPOINT, it is the backup drive. It won't find the drive if
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# it was mounted somewhere else.
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(mount | grep $MOUNTPOINT) || mount $partition_path $MOUNTPOINT
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drive=$(lsblk --inverse --noheadings --list --paths --output name $partition_path | head --lines 1)
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echo "Drive path: $drive"
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#
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# Create backups
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#
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# Options for borg create
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BORG_OPTS="--stats --one-file-system --compression lz4 --checkpoint-interval 86400"
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# Set BORG_PASSPHRASE or BORG_PASSCOMMAND somewhere around here, using export,
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# if encryption is used.
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export BORG_PASSPHRASE="`cat /etc/backups/passphrase`"
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# No one can answer if Borg asks these questions, it is better to just fail quickly
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# instead of hanging.
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export BORG_RELOCATED_REPO_ACCESS_IS_OK=no
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export BORG_UNKNOWN_UNENCRYPTED_REPO_ACCESS_IS_OK=no
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# Log Borg version
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borg --version
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echo "Starting backup for $DATE"
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# This is just an example, change it however you see fit
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borg create $BORG_OPTS \
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--exclude /media/documents/games/ \
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--exclude /media/documents/musique/ \
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--exclude /media/documents/photos/ \
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$TARGET::$DATE-$$-documents \
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/media/documents/
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# /home is often a separate partition / file system.
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# Even if it isn't (add --exclude /home above), it probably makes sense
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# to have /home in a separate archive.
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borg create $BORG_OPTS \
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--exclude 'sh:/home/*/.cache' \
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$TARGET::$DATE-$$-home \
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/home/
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echo "Completed backup for $DATE"
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# Just to be completely paranoid
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sync
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if [ -f /etc/backups/autoeject ]; then
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umount $MOUNTPOINT
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hdparm -Y $drive
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fi
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if [ -f /etc/backups/backup-suspend ]; then
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systemctl suspend
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fi
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