128 lines
3.5 KiB
Bash
Executable File
128 lines
3.5 KiB
Bash
Executable File
#!/usr/bin/env bash
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set -Eeuo pipefail
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shopt -s inherit_errexit nullglob
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# -----------------------------------------------------------------------------
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# CONFIGURATION
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# -----------------------------------------------------------------------------
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readonly BACKUP_BASE=/media/extension/backup/ubuntu
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readonly MOUNT_POINT=/media/extension
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readonly NOW=$(date +'%Y-%m-%d')
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readonly THIS_RUN="${BACKUP_BASE}/${NOW}"
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readonly LATEST="${BACKUP_BASE}/latest"
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# Directories (or files) to back up (without DB volumes)
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declare -a SOURCE_ITEMS=(
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"/home/oster/server"
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# "/home/oster/photo-lib"
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)
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# Rsync exclusions — exclude DB-related dirs that are dumped separately + common junk
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declare -a EXCLUDES=(
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--exclude='.cache'
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--exclude='node_modules'
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--exclude='*.tmp'
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--exclude='**/postgresql'
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--exclude='**/mysql'
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--exclude='**/db'
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--exclude='**/database'
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)
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# Rsync options
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RSYNC_OPTS=(
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-aAXHv # preserve everything, human-friendly, verbose
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--delete # mirror deletions
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--partial # keep partials if interrupted
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--stats # summary
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"${EXCLUDES[@]}"
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)
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# -----------------------------------------------------------------------------
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# LOGGING
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# -----------------------------------------------------------------------------
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log() { echo "[$(date +'%F %T')] $*"; }
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die() { log "FATAL: $*"; exit 1; }
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# Locking
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lockfile="${BACKUP_BASE}/.backup.lock"
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cleanup() { rm -f "$lockfile"; }
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trap cleanup EXIT
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if ! ( set -o noclobber; echo "$$" > "$lockfile" ) 2>/dev/null; then
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die "Another backup is already running (lockfile exists at $lockfile)."
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fi
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# -----------------------------------------------------------------------------
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# FUNCTIONS
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# -----------------------------------------------------------------------------
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check_mount() {
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if ! mountpoint -q "$MOUNT_POINT"; then
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die "Backup mountpoint $MOUNT_POINT is NOT mounted."
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fi
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}
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# Rotation: keep 7 daily and 4 weekly
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rotate_old() {
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log "Applying retention policy (7 daily, 4 weekly)."
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cd "$BACKUP_BASE" || die "Cannot cd into $BACKUP_BASE"
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# find snapshot dirs YYYY-MM-DD only
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for dir in $(ls -1 | grep -E '^[0-9]{4}-[0-9]{2}-[0-9]{2}$'); do
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keep=0
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# Keep last 7 daily
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for i in $(seq 0 6); do
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[ "$dir" = "$(date -d "-$i day" +%F)" ] && keep=1
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done
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# Keep last 4 Sundays (weeklies)
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for i in $(seq 0 27); do
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d=$(date -d "last sunday -$i week" +%F)
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[ "$dir" = "$d" ] && keep=1
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done
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if [ $keep -eq 0 ]; then
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log " Deleting expired snapshot $dir"
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rm -rf "$dir"
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else
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log " Keeping snapshot $dir"
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fi
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done
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}
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# -----------------------------------------------------------------------------
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# MAIN
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# -----------------------------------------------------------------------------
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log "=== Starting backup run: $NOW ==="
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check_mount
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mkdir -p "$BACKUP_BASE" "$THIS_RUN"
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# Incremental snapshot?
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if [ -d "$LATEST" ]; then
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LINK_DEST="--link-dest=$(readlink -f "$LATEST")"
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log "Using link-dest for incremental snapshot → $LATEST"
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else
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LINK_DEST=""
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log "No previous backup; creating full snapshot."
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fi
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# Run backups
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for src in "${SOURCE_ITEMS[@]}"; do
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base=$(basename "$src")
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dst="${THIS_RUN}/${base}"
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mkdir -p "$dst"
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log "Backing up $src → $dst"
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nice -n 10 ionice -c2 -n7 \
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rsync "${RSYNC_OPTS[@]}" $LINK_DEST \
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"$src"/ "$dst"/
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done
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# Update latest symlink atomically
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ln -sfn "$(basename "$THIS_RUN")" "$BACKUP_BASE/.latest.tmp"
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mv -T "$BACKUP_BASE/.latest.tmp" "$LATEST"
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log "Snapshots done. Running rotation policy..."
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rotate_old
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log "=== Backup completed successfully ==="
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