feat: Add backup.sh
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251
src/lib/backup.sh
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251
src/lib/backup.sh
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#! /usr/bin/env bash
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# backup.sh - functions for backup processing.
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# Copyright (c) 2022 ge <https://nixhacks.net/>
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <https://www.gnu.org/licenses/>.
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process_source() {
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# Run handler function for source URI by scheme.
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#
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# Usage: process_source URI
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local uri
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local scheme
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local handler
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uri="$1"
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scheme="${uri%%:*}"
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case "$scheme" in
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file) handler='backup_files';;
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mysql) handler='backup_mysql';;
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postgres) handler='backup_postgres';;
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sqlite) handler='backup_sqlite';;
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*) echo "Error: Unsupported URI scheme: $scheme" >&2; exit 1;;
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esac
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# Run handler function
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"$handler" "$uri"
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}
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process_target() {
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# Run handler function for target URI by scheme.
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#
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# Usage: process_target URI
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local uri
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local scheme
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local handler
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uri="$1"
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scheme="${uri%%:*}"
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case "$scheme" in
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file) handler='transfer_files';;
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ftp) handler='transfer_ftp';;
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sftp) handler='transfer_sftp';;
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rsync) handler='transfer_rsync';;
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s3) handler='transfer_s3';;
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sj) handler='transfer_sj';;
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swift) handler='transfer_swift';;
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dav) handler='transfer_dav';;
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davs) handler='transfer_davs';;
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*) echo "Error: Unsupported URI scheme: $scheme" >&2; exit 1;;
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esac
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# Run handler function
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"$handler" "$uri"
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}
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builtin_backup() {
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# Backup function.
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#
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# Usage: builtin_backup
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for source in "${sources[@]}"; do
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process_source "$source"
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done
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for target in "${targets[@]}"; do
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process_target "$target"
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done
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}
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# ---------------------------------------------------------- #
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# * Backup functions #
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# ---------------------------------------------------------- #
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backup_files() {
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# Backup local files with tar(1). Handle 'file' URI scheme.
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#
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# Usage: backup_files URI
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local uri
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local src_path
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local dst_path
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local archive
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local file_ext
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uri="$1"
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dst_path="$__main_target_path"
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parse_uri "$uri"
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if [ -f "$path" ] || [ -d "$path" ]; then
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src_path="$path"
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else
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echo "Error: Path '$path' from URI '$uri' does not exists" >&2
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exit 1
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fi
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is_installed tar # Exit if tar is not installed
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# Overwrire __tar_options
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if [ -n "$tar_options" ]; then
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__tar_options="$tar_options"
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fi
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# TODO выбор сжатия, можно в переменной __tar_options заменять букву z на
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# другую для соответствующего сжатия
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file_ext=.tar.gz
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archive="${dst_path}/$(gen_backup_name "$file_ext")"
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tar "$__tar_options" "$archive" "$src_path" |& log -p
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# Append path to 'backups' array
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backups+=("$archive")
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}
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backup_mysql() {
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echo Not implemented >&2; exit 1
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}
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backup_postgres() {
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echo Not implemented >&2; exit 1
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}
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backup_sqlite() {
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echo Not implemented >&2; exit 1
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}
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# ---------------------------------------------------------- #
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# * Functions for targets processing #
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# ---------------------------------------------------------- #
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transfer_files() {
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# Transfer files to another location from __main_target_path using cp(1)
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#
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# Usage: transfer_files URI
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local uri
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local dst_path
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uri="$1"
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if [[ "$uri" == "$__main_target" ]]; then
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: # Do nothing. Source and destination is the same
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else
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# Copy backups to another destination
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parse_uri "$uri"
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if [ -f "$path" ] || [ -d "$path" ]; then
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dst_path="$path"
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else
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echo "Error: Path '$path' from URI '$uri' does not exists" >&2
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exit 1
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fi
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# Copy files preserving metadata
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for backup in "${backups[@]}"; do
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cp --archive "$backup" "$dst_path"
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done
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fi
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}
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transfer_ftp() {
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echo Not implemented >&2; exit 1
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}
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transfer_sftp() {
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echo Not implemented >&2; exit 1
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}
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transfer_rsync() {
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echo Not implemented >&2; exit 1
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}
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transfer_s3() {
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echo Not implemented >&2; exit 1
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}
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transfer_sj() {
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echo Not implemented >&2; exit 1
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}
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transfer_swift() {
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echo Not implemented >&2; exit 1
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}
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transfer_dav() {
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echo Not implemented >&2; exit 1
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}
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transfer_davs() {
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echo Not implemented >&2; exit 1
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}
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# ---------------------------------------------------------- #
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# * Helper functions #
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# ---------------------------------------------------------- #
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is_installed() {
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# Check if the program is installed.
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# See good answer: https://stackoverflow.com/a/677212
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#
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# Usage: is_installed COMMAND
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local cmd
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cmd="$1"
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if ! command -v "$cmd" >/dev/null 2>&1; then
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echo "Error: Command $cmd not found." \
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"Please install $cmd or check your PATH if it's actually installed." >&2
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exit 1
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fi
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}
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gen_backup_name() {
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# Generate backup file name. Return (echo) string.
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#
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# Usage: gen_backup_name NAME_EXT
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local prefix
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local name
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local date_fmt
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local name_ext
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[ -n "$name_prefix" ] || { prefix="${__user_script}_"; }
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name="$(basename $path)" # 'path' is variable parsed from URI
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name_ext="$1"
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# Overwrite __name_date_fmt
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if [ -n "$name_date_fmt" ]; then
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__name_date_fmt="$name_date_fmt"
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fi
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date +"${prefix}${name}${__name_date_fmt}${name_ext}"
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}
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