Refactor Docker backups into modular pipeline

backup.sh

@@ -0,0 +1,32 @@
+#!/usr/bin/env bash
+# Main pipeline: container archives, configured methods, then local prune.
+set -Eeuo pipefail
+SCRIPT_DIR="$(cd -- "$(dirname -- "${BASH_SOURCE[0]}")" && pwd -P)"
+. "$SCRIPT_DIR/lib/common.sh"
+DRY_RUN=0; SKIP_CONTAINERS=0; SKIP_PRUNE=0
+while [[ $# -gt 0 ]]; do
+  case "$1" in
+    --dry-run|-t) DRY_RUN=1 ;; --skip-containers) SKIP_CONTAINERS=1 ;; --skip-prune) SKIP_PRUNE=1 ;;
+    -h|--help)
+      echo "Usage: ${0##*/} [--dry-run] [--skip-containers] [--skip-prune]"
+      echo "Methods run in BACKUP_METHODS order. Add methods/NN-name.sh and list name in BACKUP_METHODS."
+      exit 0 ;;
+    *) die "Unknown option: $1" 2 ;;
+  esac
+  shift
+done
+require_command flock
+mkdir -p "$(dirname "$LOCK_FILE")"
+exec 9>"$LOCK_FILE"
+flock -n 9 || die "Another backup run holds lock: $LOCK_FILE"
+stage_args=(); (( DRY_RUN )) && stage_args+=(--dry-run)
+log START "Backup pipeline for $BACKUP_HOSTNAME"
+(( SKIP_CONTAINERS )) || "$SCRIPT_DIR/stages/10-containers.sh" "${stage_args[@]}"
+for method in $BACKUP_METHODS; do
+  method_script=""
+  while IFS= read -r candidate; do method_script="$candidate"; break; done < <(find "$SCRIPT_DIR/methods" -maxdepth 1 -type f -name "*-${method}.sh" -print | sort)
+  [[ -n "$method_script" ]] || die "Configured backup method not found: $method"
+  "$method_script" "${stage_args[@]}"
+done
+(( SKIP_PRUNE )) || "$SCRIPT_DIR/stages/90-prune.sh" "${stage_args[@]}"
+log DONE "Backup pipeline completed successfully"