Julien LutranandClaude Fable 5
75760ba303
First cron run (2026-08-28 05:00) failed with 'restic: command not found'; interactive shells had /usr/local/bin, cron does not. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
122 lines
3.9 KiB
Bash
Executable File
122 lines
3.9 KiB
Bash
Executable File
#!/bin/bash
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#
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# Nightly restic backup of the incus instances (repo: restic-incus).
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# For every instance of the `backup` project (quiesced replicas —
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# stopped, refreshed by the 01:00 incus-copy), mount its filesystem
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# with `incus file mount` (FUSE over the per-instance sftp API, works
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# on stopped containers, needs sshfs) and back it up per-file,
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# together with its expanded config.
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#
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# ⚠️ Each instance gets its OWN mountpoint (/run/restic-incus/<name>):
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# restic selects a snapshot's parent by host+path, so a shared
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# mountpoint would parent every snapshot on the previous *other*
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# instance and force nightly full re-reads.
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#
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# Runs CHAINED after incus-copy.sh in the same cron entry — the
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# snapshot is only as fresh as the last completed replica refresh:
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# 0 1 * * * incus-copy.sh -p backup -s backup >> /var/log/incus-copy.log 2>&1 ; restic-incus-backup.sh >> /var/log/restic-incus.log 2>&1
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#
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# Usage: restic-incus-backup.sh [-r <repo>] [-p <project>]
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# [-x <exclude,list>] [-i <only,these>]
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#
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# All instances by default; opt-out via -x (logged loudly — the list
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# cannot rot silently).
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set -u
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REPO=s3:s3.sbg.io.cloud.ovh.net/restic-incus
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PROJECT=backup
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EXCLUDE_INSTANCES="nextcloud,seafile" # seek-bound giants: data covered by restic-data
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ONLY_INSTANCES=""
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MNT_ROOT=/run/restic-incus
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LOCKFILE=/run/lock/restic-incus-backup.lock
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ENVFILE=/root/.restic-env
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RESTIC=/usr/local/bin/restic # cron PATH lacks /usr/local/bin
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MOUNT_TIMEOUT=30
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usage() {
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echo "Usage: $0 [-r <repo>] [-p <project>] [-x <exclude,list>] [-i <only,list>]" >&2
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exit 2
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}
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while getopts r:p:x:i: flag; do
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case "${flag}" in
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r) REPO=${OPTARG};;
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p) PROJECT=${OPTARG};;
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x) EXCLUDE_INSTANCES=${OPTARG};;
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i) ONLY_INSTANCES=${OPTARG};;
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*) usage;;
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esac
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done
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[ -r "$ENVFILE" ] || { echo "env file $ENVFILE not readable" >&2; exit 2; }
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. "$ENVFILE"
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command -v sshfs >/dev/null || { echo "sshfs not installed (needed by incus file mount)" >&2; exit 2; }
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exec 9>"$LOCKFILE"
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if ! flock -n 9; then
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echo "another restic-incus-backup run holds $LOCKFILE, aborting" >&2
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exit 1
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fi
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log() { echo "[$(date '+%F %T')] $*"; }
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cleanup_mount() { # $1 = mountpoint, $2 = mount pid
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[ -n "${2:-}" ] && kill "$2" 2>/dev/null
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for _ in 1 2 3 4 5; do
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mountpoint -q "$1" || return 0
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fusermount -u "$1" 2>/dev/null || umount "$1" 2>/dev/null
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sleep 1
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done
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mountpoint -q "$1" && { echo "failed to unmount $1" >&2; return 1; }
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return 0
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}
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rc=0
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mkdir -p "$MNT_ROOT"
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for inst in $(incus list --project "$PROJECT" -c n -f csv); do
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if [ -n "$ONLY_INSTANCES" ]; then
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case ",$ONLY_INSTANCES," in *",$inst,"*) ;; *) continue;; esac
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fi
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case ",$EXCLUDE_INSTANCES," in
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*",$inst,"*) log "SKIP $inst (excluded)"; continue;;
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esac
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mnt="$MNT_ROOT/$inst"
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mkdir -p "$mnt"
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mountpoint -q "$mnt" && cleanup_mount "$mnt" "" # stale from a killed run
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# instance definition, backed up alongside the tree
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incus config show "$inst" --project "$PROJECT" --expanded > "$MNT_ROOT/$inst.yaml" \
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|| { echo "config dump of $inst failed" >&2; rc=1; }
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incus file mount "$inst/" "$mnt" --project "$PROJECT" >/dev/null 2>&1 &
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mpid=$!
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mounted=""
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for _ in $(seq "$MOUNT_TIMEOUT"); do
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mountpoint -q "$mnt" && { mounted=1; break; }
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kill -0 "$mpid" 2>/dev/null || break
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sleep 1
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done
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if [ -z "$mounted" ]; then
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echo "mount of $inst failed" >&2; rc=1
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cleanup_mount "$mnt" "$mpid"
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continue
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fi
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log "backup $inst"
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$RESTIC -r "$REPO" backup \
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--pack-size 64 --read-concurrency 8 -o s3.connections=8 \
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--tag "$inst" "$mnt" "$MNT_ROOT/$inst.yaml" \
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|| { echo "backup of $inst failed" >&2; rc=1; }
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cleanup_mount "$mnt" "$mpid" || rc=1
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done
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log "forget: keep 14d/8w/6m"
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$RESTIC -r "$REPO" forget --keep-daily 14 --keep-weekly 8 --keep-monthly 6 || rc=1
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log "done (rc=$rc)"
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exit $rc
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