CroneKorkN
9d9ac7ac5e
Clients deleted every auto-backup_ snapshot on the server except the newest, so the backup held one state only. prune-snapshots now keeps the newest per day, week and month (14/8/24 by default) independent of the source, and the clients call it after each receive. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01RywMtsL8qXG7GDY3MHq9Uh
64 lines
2.4 KiB
Bash
64 lines
2.4 KiB
Bash
#!/bin/bash
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set -eu
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path=$1
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uuid=$(jq -r .client_uuid < /etc/backup/config.json)
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server=$(jq -r .server_hostname < /etc/backup/config.json)
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ssh="ssh -o ConnectTimeout=5 backup-receiver@$server"
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source_dataset=$(zfs list -H -o mountpoint,name | grep -P "^$path\t" | cut -d $'\t' -f 2)
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target_dataset="tank/$uuid/$source_dataset"
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target_dataset_parent=$(echo $target_dataset | rev | cut -d / -f 2- | rev)
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bookmark_prefix="auto-backup_"
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new_bookmark="$bookmark_prefix$(date +"%Y-%m-%d_%H:%M:%S")"
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for var in path uuid server ssh source_dataset target_dataset target_dataset_parent new_bookmark
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do
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[[ -z "${!var}" ]] && echo "ERROR - $var is empty" && exit 96
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done
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$ssh true || (echo "ERROR - cant ssh connect to $server" && exit 97)
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echo "BACKUP ZFS DATASET - PATH: $path, SERVER: $server, UUID: $uuid, SOURCE_DATASET: $source_dataset, TARGET_DATASET: $target_dataset"
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if ! $ssh sudo zfs list -t filesystem -H -o name | grep -q "^$target_dataset_parent$"
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then
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echo "CREATING PARENT DATASET..."
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$ssh sudo zfs create -p -o mountpoint=none "$target_dataset_parent"
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fi
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zfs snap "$source_dataset@$new_bookmark"
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if zfs list -t bookmark -H -o name | grep "^$source_dataset#$bookmark_prefix" | wc -l | grep -q "^0$"
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then
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echo "INITIAL BACKUP"
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# do in subshell, otherwise ctr+c will lead to 0 exitcode
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$(zfs send -v "$source_dataset@$new_bookmark" | $ssh sudo zfs recv -F "$target_dataset")
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else
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echo "INCREMENTAL BACKUP"
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last_bookmark=$(zfs list -t bookmark -H -o name | grep "^$source_dataset#$bookmark_prefix" | sort | tail -1 | cut -d '#' -f 2)
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[[ -z "$last_bookmark" ]] && echo "ERROR - last_bookmark is empty" && exit 98
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$(zfs send -v -L -i "#$last_bookmark" "$source_dataset@$new_bookmark" | $ssh sudo zfs recv "$target_dataset")
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fi
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if [[ "$?" == "0" ]]
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then
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# delete old local bookmarks
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for destroyable_bookmark in $(zfs list -t bookmark -H -o name "$source_dataset" | grep "^$source_dataset#$bookmark_prefix")
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do
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zfs destroy "$destroyable_bookmark"
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done
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# the backup server thins out its snapshots by its own retention
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$ssh sudo /opt/backup-server/prune-snapshots "$target_dataset" || echo "WARNING - pruning snapshots of $target_dataset failed"
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zfs bookmark "$source_dataset@$new_bookmark" "$source_dataset#$new_bookmark"
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zfs destroy "$source_dataset@$new_bookmark" # keep snapshots?
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echo "SUCCESS"
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else
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zfs destroy "$source_dataset@$new_bookmark"
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echo "ERROR"
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exit 99
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fi
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