adam
b8fe5a19fc
Add a check for when retention equals 0. When retentions is set to 0 but no backups exist the message would still say "No old backups to remove for $vm". This change changes the message as no backups would be removed even if they were found.
102 lines
2.7 KiB
Bash
Executable File
102 lines
2.7 KiB
Bash
Executable File
#!/usr/bin/env bash
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main() {
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# Set default options
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local cmd="${CMD:-lxc}"
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local backup_dir="${BACKUP_DIR:-$PWD}"
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local compression="${COMPRESSION:-zstd}"
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local vm_list
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local retention=0
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while getopts ":l:d:t:x:c:h" opt; do
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case "${opt}" in
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l)
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IFS="," read -r -a vm_list <<< "$OPTARG";;
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d)
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backup_dir="${OPTARG%/}";;
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t)
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cmd="$OPTARG";;
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x)
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compression="$OPTARG";;
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c)
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retention="${OPTARG}";;
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h|*)
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usage;;
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esac
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done
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lxc() { command "$cmd" "$@"; }
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list_vms() { lxc list -c n -f csv; }
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if ((${#vm_list[@]} == 0)); then
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mapfile -t vm_list < <(list_vms)
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fi
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for vm in "${vm_list[@]}"; do
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start_backup "$vm" "$backup_dir" "$compression"
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if (( retention > 0 )); then
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prune_backups "$vm" "$backup_dir" "$retention"
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fi
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done
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exit 0
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}
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usage() {
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cat <<EOF
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Usage: ${0##*/} [-l vm[,vm...]] [-d <backup directory>] [-t lxc|incus] [-x <compression alogorithm>] [-c <keep last n backups>] [-h]
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Options:
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-l Comma-separated list of VMs to back up
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-d Directory where backups will be stored (default: current directory)
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-t Manager type: lxc or incus (default: lxc)
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-x Compression algorithm (e.g. gzip, zstd, none)
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-c Cleanup old backups and keep last <n> (default: keep all)
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-h Show this message
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EOF
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exit 1
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}
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start_backup() {
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local vm=$1
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local backup_dir="$2"
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local compression="$3"
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local ext=".${compression}"
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if [[ "$compression" == 'none' ]]; then
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ext=""
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else
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command -v "$compression" >/dev/null 2>&1 || { echo "$compression command not found"; exit 1; }
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fi
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local vm_dir="${backup_dir}/${vm}"
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local backup_name
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backup_name="${vm}_$(date +"%Y-%m-%d_%H-%M-%S").tar${ext}"
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[[ -d "$backup_dir" ]] || { echo "${backup_dir} is not a directory"; exit 1; }
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[[ -d "$vm_dir" ]] || mkdir "$vm_dir" || { echo "Cannont create $vm_dir"; exit 1; }
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[[ -f "${vm_dir}/${backup_name}" ]] && { echo "Backup already exists"; return 2; }
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echo "starting $vm"
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lxc export "$vm" --instance-only --compression "${compression}" "${vm_dir}/${backup_name}" || { echo "Error exporting $vm"; return 1; }
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}
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prune_backups() {
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local vm="$1"
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local backup_dir="$2"
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local retention="$3"
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mapfile -t backup_files < <(find "${backup_dir}/${vm}" -maxdepth 1 -type f -printf '%T@ %p\n' | sort -n | head -n "-${retention}" | cut -d' ' -f2-)
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if [[ ${#backup_files[@]} -gt 0 ]]; then
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echo "Removing ${#backup_files[@]} old backup files for $vm (keeping last $retention files)"
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printf '%s\0' "${backup_files[@]}" | xargs -0 rm -fv > /dev/null
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elif [[ "${retention}" -eq 0 ]]; then
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echo "Keeping all existing backups for $vm"
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else
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echo "No old backups to remove for $vm"
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fi
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}
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main "$@"
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