basic functionality

app/backup.sh

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+#! /usr/bin/env bash
+
+set -euo pipefail
+
+### DEFAULTS ###
+
+BACKUP_SOURCE="/mnt/backup"
+
+### CHECK REQUIRED ENV VARS ###
+
+REQ_VARS=(
+  "PBS_SERVER"
+  "PBS_DATASTORE"
+  "PBS_BACKUP_ID"
+  "PBS_PASSWORD"
+)
+
+for var in "${REQ_VARS[@]}"; do
+  if [[ -z "${!var:-}" ]]; then
+    echo "ERROR: Required environment variable '$var' is not set." >&2
+    exit 1
+  fi
+done
+
+# Optional fingerprint
+if [[ -n "${PBS_FINGERPRINT:-}" ]]; then
+  export PBS_FINGERPRINT
+fi
+
+export PBS_PASSWORD
+
+
+
+### LOGGING SETUP ###
+
+LOGFILE="/var/log/pbs-backup.log"
+mkdir -p "$(dirname "$LOGFILE")"
+
+log() {
+    # Log to stdout + file simultaneously, Docker-friendly
+    printf "%s\n" "$*" | tee -a "$LOGFILE" >/proc/1/fd/1
+}
+
+
+
+### BACKUP OPERATION ###
+
+TIMESTAMP=$(date +"%Y-%m-%d_%H-%M-%S")
+SNAPSHOT_NAME="backup-$TIMESTAMP"
+
+log "==============================================="
+log " Starting PBS Backup: $SNAPSHOT_NAME"
+log " Source:      $BACKUP_SOURCE"
+log " Repository:  $PBS_SERVER:$PBS_DATASTORE"
+log " Backup ID:   $PBS_BACKUP_ID"
+log "==============================================="
+
+proxmox-backup-client backup \
+  "$SNAPSHOT_NAME.pxar:$BACKUP_SOURCE" \
+  --repository "$PBS_SERVER:$PBS_DATASTORE" \
+  --backup-id "$PBS_BACKUP_ID" \
+  2>&1 | tee -a "$LOGFILE" >/proc/1/fd/1
+
+log "--- Backup completed ---"
+
+
+
+### PRUNE (optional) ###
+
+PBS_PRUNE="${PBS_PRUNE:-true}"
+PRUNE_ARGS="${PBS_PRUNE_ARGS:---keep-daily=7 --keep-weekly=4 --keep-monthly=3}"
+
+if [[ "$PBS_PRUNE" == "true" ]]; then
+    log "--- Running prune ---"
+
+    proxmox-backup-client prune \
+      --repository "$PBS_SERVER:$PBS_DATASTORE" \
+      --backup-id "$PBS_BACKUP_ID" \
+      $PRUNE_ARGS \
+      2>&1 | tee -a "$LOGFILE" >/proc/1/fd/1
+
+    log "--- Prune completed ---"
+else
+    log "--- Prune disabled ---"
+fi
+
+echo "=== Done ===" | tee -a