adding script that cleans up archived wal files

Co-authored-by: Copilot <copilot@github.com>
2026-04-24 09:10:03 -04:00
parent 9bef455732
commit b728fe84f2
1 changed files with 118 additions and 0 deletions
@@ -0,0 +1,118 @@
+#!/usr/bin/env bash
+
+set -euo pipefail
+
+ARCHIVE_DIR="/var/lib/postgresql_archive/18/main/pg_wal"
+MIN_AGE_DAYS=7
+DRY_RUN=1
+
+usage() {
+	cat <<'EOF'
+Usage: clean_walfiles.sh [--apply] [--archive-dir PATH] [--min-age-days N]
+
+Cleans PostgreSQL archive WAL files using both rules:
+1) Candidate file mtime is older than the oldest *.backup file mtime
+2) Candidate file mtime is older than N days (default: 7)
+
+Defaults to dry-run. Use --apply to actually delete files.
+EOF
+}
+
+while [[ $# -gt 0 ]]; do
+	case "$1" in
+		--apply)
+			DRY_RUN=0
+			shift
+			;;
+		--archive-dir)
+			ARCHIVE_DIR="$2"
+			shift 2
+			;;
+		--min-age-days)
+			MIN_AGE_DAYS="$2"
+			shift 2
+			;;
+		-h|--help)
+			usage
+			exit 0
+			;;
+		*)
+			echo "Unknown argument: $1" >&2
+			usage
+			exit 2
+			;;
+	esac
+done
+
+if [[ ! -d "$ARCHIVE_DIR" ]]; then
+	echo "Archive directory does not exist: $ARCHIVE_DIR" >&2
+	exit 1
+fi
+
+if ! [[ "$MIN_AGE_DAYS" =~ ^[0-9]+$ ]]; then
+	echo "--min-age-days must be a non-negative integer" >&2
+	exit 2
+fi
+
+mapfile -d '' backup_files < <(find "$ARCHIVE_DIR" -maxdepth 1 -type f -name '*.backup' -print0)
+
+if [[ ${#backup_files[@]} -eq 0 ]]; then
+	echo "No .backup files found in $ARCHIVE_DIR; nothing to do."
+	exit 0
+fi
+
+oldest_backup=""
+oldest_backup_ts=""
+
+for backup_file in "${backup_files[@]}"; do
+	backup_ts=$(stat -c %Y "$backup_file")
+	if [[ -z "$oldest_backup_ts" || "$backup_ts" -lt "$oldest_backup_ts" ]]; then
+		oldest_backup_ts="$backup_ts"
+		oldest_backup="$backup_file"
+	fi
+done
+
+age_cutoff_ts=$(date -d "$MIN_AGE_DAYS days ago" +%s)
+
+echo "Archive dir         : $ARCHIVE_DIR"
+echo "Oldest .backup file : $oldest_backup"
+echo "Oldest .backup mtime: $oldest_backup_ts"
+echo "Age cutoff (epoch)  : $age_cutoff_ts"
+
+declare -a files_to_delete=()
+
+while IFS= read -r -d '' file; do
+	file_ts=$(stat -c %Y "$file")
+
+	# Delete only when both constraints are true.
+	if [[ "$file_ts" -lt "$oldest_backup_ts" && "$file_ts" -lt "$age_cutoff_ts" ]]; then
+		files_to_delete+=("$file")
+	fi
+done < <(find "$ARCHIVE_DIR" -maxdepth 1 -type f ! -name '*.backup' -print0)
+
+if [[ ${#files_to_delete[@]} -eq 0 ]]; then
+	echo "No files matched cleanup criteria."
+	exit 0
+fi
+
+echo ""
+echo "Files matching cleanup criteria (${#files_to_delete[@]}):"
+for file in "${files_to_delete[@]}"; do
+	echo "  $file"
+done
+
+if [[ "$DRY_RUN" -eq 1 ]]; then
+	echo ""
+	echo "Dry-run mode: no files were deleted."
+	echo "Re-run with --apply to delete the files above."
+	exit 0
+fi
+
+deleted=0
+for file in "${files_to_delete[@]}"; do
+	rm -f -- "$file"
+	((deleted += 1))
+done
+
+echo ""
+echo "Deleted $deleted file(s)."