backup-helper/backup.sh

#!/usr/bin/env bash

# If neither of BACKUP_HELPER_DIRS and BACKUP_HELPER_COMMANDS not set. Exit
if [ -z "$BACKUP_HELPER_DIRS" ] && [ -z "$BACKUP_HELPER_COMMANDS" ]; then
  echo "BACKUP_HELPER_DIRS is not set"
  exit 1;
fi
exit_code=0;

# Backup directories
if [ -n "$BACKUP_HELPER_DIRS" ]; then
  for i in ${BACKUP_HELPER_DIRS//,/ }; do
    echo "Starting backup of $i";
    if ! output=$(restic backup "$i"); then
      exit_code=1;
      echo "Backup of $i failed with exit code $?:"
      echo "$output"
    else
      echo "Backup of $i successful:"
      echo "$output"
    fi
  done
fi

# Backup command outputs
if [ -n "$BACKUP_HELPER_COMMANDS" ]; then
  IFS=";" read -r -a pairs <<< "$BACKUP_HELPER_COMMANDS"

  for pair in "${pairs[@]}"; do
      IFS=":" read -r key value <<< "$pair"

      # Split value into array of command args
      IFS=' ' read -r -a cmd_parts <<< "$value"
      if ! output=$(restic backup --stdin-filename "$key" --stdin-from-command -- "${cmd_parts[@]}"); then
        exit_code=1;
        echo "Backup of $key failed with exit code $?:"
        echo "$output"
      else
        echo "Backup of $key successful:"
        echo "$output"
      fi
        
  done
fi

if [ "$BACKUP_FORGET" -eq 1 ]; then
  echo "Removing old backups"
  output=$(restic forget -d 7 -w 4 -m 6 --keep-within 1d --prune)
  echo "$output"
fi
exit "$exit_code"