159 lines
4.6 KiB
Bash
159 lines
4.6 KiB
Bash
#!/usr/bin/env bash
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#!/bin/bash
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# Check for required argument
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if [ $# -ne 1 ]; then
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echo "Usage: $(basename "$0") SNAPPER_CONFIG"
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echo "Example: $(basename "$0") root"
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exit 1
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fi
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# Configuration
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SNAPPER_CONFIG="$1"
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# Get the actual snapshot location from snapper config
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SOURCE_PATH=$(snapper -c "$SNAPPER_CONFIG" get-config | grep '^SUBVOLUME' | cut -d'=' -f2 | tr -d '"'| awk {'print $3'})
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if [ -z "$SOURCE_PATH" ]; then
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echo "ERROR: Could not determine snapshot path for config '$SNAPPER_CONFIG'"
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exit 1
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fi
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# Convert subvolume path to snapshot path
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SNAPSHOT_PATH="$SOURCE_PATH/.snapshots"
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if [ ! -d "$SNAPSHOT_PATH" ]; then
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echo "ERROR: Snapshot directory '$SNAPSHOT_PATH' does not exist"
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exit 1
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fi
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REMOTE_HOST="root@synology"
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DEST_PATH="/volume1/backups/btrfs_`hostname`_${SNAPPER_CONFIG}"
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STATE_FILE="/var/lib/snapper-backup-${SNAPPER_CONFIG}.state"
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LOG_FILE="/var/log/snapper-backup-${SNAPPER_CONFIG}.log"
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KEEP_SNAPSHOTS=5
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# Ensure we exit on any error
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set -e
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# Verify snapper config exists
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if ! snapper -c "$SNAPPER_CONFIG" list &>/dev/null; then
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echo "ERROR: Snapper config '$SNAPPER_CONFIG' does not exist"
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exit 1
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fi
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# Logging function
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log() {
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echo "$(date '+%Y-%m-%d %H:%M:%S') - $1" | tee -a "$LOG_FILE"
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}
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# Function to verify snapshot exists
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verify_snapshot() {
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local snapshot_num="$1"
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if [ ! -d "$SNAPSHOT_PATH/$snapshot_num/snapshot" ]; then
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log "ERROR: Snapshot $snapshot_num does not exist"
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return 1
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fi
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return 0
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}
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# Function to verify remote connectivity
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verify_remote() {
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if ! ssh -q "$REMOTE_HOST" "exit"; then
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log "ERROR: Cannot connect to remote host"
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exit 1
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fi
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}
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# Function to get remote snapshots
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get_remote_snapshots() {
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ssh "$REMOTE_HOST" "find '$DEST_PATH' -maxdepth 1 -type d -name 'snapshot*' | sort -n"
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}
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# Function to cleanup old remote snapshots
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cleanup_remote_snapshots() {
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local snapshots=($(get_remote_snapshots))
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local count=${#snapshots[@]}
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if [ $count -gt $KEEP_SNAPSHOTS ]; then
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local to_delete=$((count - KEEP_SNAPSHOTS))
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log "Cleaning up $to_delete old snapshots on remote system"
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for ((i=0; i<$to_delete; i++)); do
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local snapshot="${snapshots[$i]}"
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log "Deleting remote snapshot: $snapshot"
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ssh "$REMOTE_HOST" "btrfs subvolume delete '$snapshot'" || \
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log "WARNING: Failed to delete snapshot $snapshot"
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done
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fi
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}
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# Start backup process
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log "Starting backup for snapper config: $SNAPPER_CONFIG"
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log "Using snapshot path: $SNAPSHOT_PATH"
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# Verify remote connectivity first
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verify_remote
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# Get latest successful transfer number
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LAST_TRANSFERRED=$(cat "$STATE_FILE" 2>/dev/null || echo "")
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# Get latest snapshot number from snapper
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LATEST_SNAPSHOT=$(snapper -c "$SNAPPER_CONFIG" list | tail -n 1 | awk '{print $1}')
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# Verify snapshots exist
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verify_snapshot "$LATEST_SNAPSHOT" || exit 1
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if [ -n "$LAST_TRANSFERRED" ]; then
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verify_snapshot "$LAST_TRANSFERRED" || exit 1
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fi
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# Exit if no new snapshots to transfer
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if [ "$LAST_TRANSFERRED" = "$LATEST_SNAPSHOT" ]; then
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log "No new snapshots to transfer"
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exit 0
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fi
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# Create destination directory if it doesn't exist
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ssh "$REMOTE_HOST" "mkdir -p '$DEST_PATH'"
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# Perform the transfer
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if [ -z "$LAST_TRANSFERRED" ]; then
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# First time backup - full send
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log "Performing full send of snapshot $LATEST_SNAPSHOT"
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sudo btrfs send "$SNAPSHOT_PATH/$LATEST_SNAPSHOT/snapshot" | \
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pv -bytes | \
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ssh "$REMOTE_HOST" "btrfs receive '$DEST_PATH'" && {
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echo "$LATEST_SNAPSHOT" > "$STATE_FILE"
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log "Full send completed successfully"
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} || {
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log "ERROR: Full send failed"
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exit 1
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}
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else
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# Incremental send
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log "Performing incremental send from $LAST_TRANSFERRED to $LATEST_SNAPSHOT"
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sudo btrfs send -p "$SNAPSHOT_PATH/$LAST_TRANSFERRED/snapshot" \
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"$SNAPSHOT_PATH/$LATEST_SNAPSHOT/snapshot" | \
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pv -bytes | \
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ssh "$REMOTE_HOST" "btrfs receive '$DEST_PATH'" && {
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echo "$LATEST_SNAPSHOT" > "$STATE_FILE"
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log "Incremental send completed successfully"
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} || {
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log "ERROR: Incremental send failed"
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exit 1
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}
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fi
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# Cleanup old snapshots if transfer was successful
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cleanup_remote_snapshots
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# Verify remote snapshots
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log "Current remote snapshots:"
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get_remote_snapshots | tee -a "$LOG_FILE"
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# Final verification
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if ! ssh "$REMOTE_HOST" "btrfs subvolume show '$DEST_PATH/snapshot'" &>/dev/null; then
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log "WARNING: Final verification failed"
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exit 1
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fi
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log "Backup completed successfully"
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