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machine-a-tsoins
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helpers/helpers.v2.1.d/backup
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291
helpers/helpers.v2.1.d/backup
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#!/usr/bin/env bash
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#
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# Copyright (c) 2024 YunoHost Contributors
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#
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# This file is part of YunoHost (see https://yunohost.org)
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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 Affero General Public License as
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# published by the Free Software Foundation, either version 3 of the
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# License, or (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 Affero General Public License for more details.
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#
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# You should have received a copy of the GNU Affero General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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#
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CAN_BIND=${CAN_BIND:-1}
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# Add a file or a directory to the list of paths to backup
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#
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# usage: ynh_backup /path/to/stuff
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#
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# NB : note that this helper does *NOT* perform any copy in itself, it only
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# declares stuff to be backuped via a CSV which is later picked up by the core
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#
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# NB 2 : there is a specific behavior for $data_dir (or childs of $data_dir) and
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# /var/log/$app which are *NOT* backedup during safety-backup-before-upgrade,
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# OR if the setting "do_not_backup_data" is equals 1 for that app
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#
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# The rationale is that these directories are usually too heavy to be integrated in every backup
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# (think for example about Nextcloud with quite a lot of data, or an app with a lot of media files...)
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#
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# This is coupled to the fact that $data_dir and the log dir won't be (and
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# should NOT) be deleted during remove, unless --purge is used. Hence, if the
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# upgrade fails and the script is removed prior to restoring the backup, the
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# data/logs are not destroyed.
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#
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ynh_backup() {
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local target="$1"
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local is_data=false
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# If the path starts with /var/log/$app or $data_dir
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if [[ (-n "${app:-}" && "$target" =~ ^/var/log/$app/?\*?$) || (-n "${data_dir:-}" && "$target" =~ ^$data_dir) ]]; then
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is_data=true
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fi
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if [[ -n "${app:-}" ]]; then
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local do_not_backup_data=$(ynh_app_setting_get --key=do_not_backup_data)
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fi
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# If backing up core only (used by ynh_backup_before_upgrade),
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# don't backup big data items
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if [[ "$is_data" == true && ("${do_not_backup_data:-0}" -eq 1 || ${BACKUP_CORE_ONLY:-0} -eq 1) ]]; then
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if [ "${BACKUP_CORE_ONLY:-0}" -eq 1 ]; then
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ynh_print_info "$target will not be saved, because 'BACKUP_CORE_ONLY' is set."
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else
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ynh_print_info "$target will not be saved, because 'do_not_backup_data' is set."
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fi
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return 0
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fi
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# ==============================================================================
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# Format correctly source and destination paths
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# ==============================================================================
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# Be sure the source path is not empty
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if [ ! -e "$target" ]; then
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ynh_print_warn "File or folder '${target}' to be backed up does not exist"
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return 1
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fi
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# Transform the source path as an absolute path
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# If it's a dir remove the ending /
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src_path=$(realpath "$target")
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# Initialize the dest path with the source path relative to "/".
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# eg: src_path=/etc/yunohost -> dest_path=etc/yunohost
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dest_path="${src_path#/}"
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# Check if dest_path already exists in tmp archive
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if [[ -e "${dest_path}" ]]; then
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ynh_print_warn "Destination path '${dest_path}' already exist"
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return 1
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fi
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# Add the relative current working directory to the destination path
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local rel_dir="${YNH_CWD#"$YNH_BACKUP_DIR"}"
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rel_dir="${rel_dir%/}/"
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dest_path="${rel_dir}${dest_path}"
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dest_path="${dest_path#/}"
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# ==============================================================================
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# ==============================================================================
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# Write file to backup into backup_list
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# ==============================================================================
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local src=$(echo "${src_path}" | sed --regexp-extended 's/"/\"\"/g')
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local dest=$(echo "${dest_path}" | sed --regexp-extended 's/"/\"\"/g')
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echo "\"${src}\",\"${dest}\"" >> "${YNH_BACKUP_CSV}"
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# ==============================================================================
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# Create the parent dir of the destination path
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# It's for retro compatibility, some script consider ynh_backup creates this dir
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mkdir --parents "$(dirname "$YNH_BACKUP_DIR/${dest_path}")"
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}
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# Return the path in the archive where has been stocked the origin path
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#
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# [internal]
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#
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# usage: _get_archive_path ORIGIN_PATH
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_get_archive_path() {
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# For security reasons we use csv python library to read the CSV
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python3 -c "
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import sys
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import csv
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with open(sys.argv[1], 'r') as backup_file:
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backup_csv = csv.DictReader(backup_file, fieldnames=['source', 'dest'])
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for row in backup_csv:
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if row['source']==sys.argv[2].strip('\"'):
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print(row['dest'])
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sys.exit(0)
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raise Exception('Original path for %s not found' % sys.argv[2])
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" "${YNH_BACKUP_CSV}" "$1"
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return $?
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}
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# Restore a file or a directory from the backup archive
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#
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# usage: ynh_restore /path/to/stuff
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#
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# examples:
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# ynh_restore "/etc/nginx/conf.d/$domain.d/$app.conf"
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#
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# If the file or dir to be restored already exists on the system and is lighter
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# than 500 Mo, it is backed up in `/var/cache/yunohost/appconfbackup/`.
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# Otherwise, the existing file or dir is removed.
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#
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# if `apps/$app/etc/nginx/conf.d/$domain.d/$app.conf` exists, restore it into
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# `/etc/nginx/conf.d/$domain.d/$app.conf`
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# otheriwse, search for a match in the csv (eg: conf/nginx.conf) and restore it into
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# `/etc/nginx/conf.d/$domain.d/$app.conf`
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ynh_restore() {
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target="$1"
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local archive_path="$YNH_CWD${target}"
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# If the path starts with /var/log/$app or $data_dir
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local is_data=false
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# If the path starts with /var/log/$app or $data_dir
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if [[ (-n "${app:-}" && "$target" =~ ^/var/log/$app/?\*?$) || (-n "${data_dir:-}" && "$target" =~ ^$data_dir) ]]; then
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is_data=true
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fi
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# If archive_path doesn't exist, search for a corresponding path in CSV
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if [ ! -d "$archive_path" ] && [ ! -f "$archive_path" ] && [ ! -L "$archive_path" ]; then
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if [[ "$is_data" == true ]]; then
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ynh_print_info "Skipping $target which doesn't exists in the archive, probably because restoring from a safety-backup-before-upgrade"
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# Assume it's not a big deal, we may be restoring a safety-backup-before-upgrade which doesnt contain those
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return 0
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else
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# (get_archive_path will raise an exception if no match found)
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archive_path="$YNH_BACKUP_DIR/$(_get_archive_path "\"$target\"")"
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fi
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fi
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# Move the old directory if it already exists
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if [[ -e "${target}" ]]; then
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# Check if the file/dir size is less than 500 Mo
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if [[ $(du --summarize --bytes "$target" | cut --delimiter="/" --fields=1) -le "500000000" ]]; then
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local backup_file="/var/cache/yunohost/appconfbackup/${target}.backup.$(date '+%Y%m%d.%H%M%S')"
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mkdir --parents "$(dirname "$backup_file")"
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mv "${target}" "$backup_file" # Move the current file or directory
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else
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ynh_safe_rm "${target}"
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fi
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fi
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# Restore target into target
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mkdir --parents "$(dirname "$target")"
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# Do a copy if it's just a mounting point
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if mountpoint --quiet "$YNH_BACKUP_DIR"; then
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if [[ -d "${archive_path}" ]]; then
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archive_path="${archive_path}/."
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mkdir --parents "$target"
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fi
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cp --archive "$archive_path" "${target}"
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# Do a move if YNH_BACKUP_DIR is already a copy
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else
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mv "$archive_path" "${target}"
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fi
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_ynh_apply_default_permissions "$target"
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}
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# Restore all files that were previously backuped in an app backup script
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#
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# usage: ynh_restore_everything
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ynh_restore_everything() {
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# Deduce the relative path of $YNH_CWD
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local REL_DIR="${YNH_CWD#"$YNH_BACKUP_DIR/"}"
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REL_DIR="${REL_DIR%/}/"
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# For each destination path begining by $REL_DIR
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cat "$YNH_BACKUP_CSV" | tr --delete $'\r' | grep --only-matching --no-filename --perl-regexp "^\".*\",\"$REL_DIR.*\"$" \
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| while read -r line; do
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local ARCHIVE_PATH=$(echo "$line" | grep --only-matching --no-filename --perl-regexp "^\"\K.*(?=\",\"$REL_DIR.*\"$)")
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ynh_restore "$ARCHIVE_PATH"
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done
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}
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_ynh_file_checksum_exists() {
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local file=$1
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local checksum_setting_name=checksum_${file//[\/ ]/_} # Replace all '/' and ' ' by '_'
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[[ -n "$(ynh_app_setting_get --key="$checksum_setting_name")" ]]
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}
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# Calculate and store a file checksum into the app settings
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#
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# usage: ynh_store_file_checksum /path/to/file
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ynh_store_file_checksum() {
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set +o xtrace # set +x
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local file=$1
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local checksum_setting_name=checksum_${file//[\/ ]/_} # Replace all '/' and ' ' by '_'
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ynh_app_setting_set --key="$checksum_setting_name" --value="$(md5sum "$file" | cut --delimiter=' ' --fields=1)"
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if ynh_in_ci_tests; then
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# Using a base64 is in fact more reversible than "replace / and space by _" ... So we can in fact obtain the original file path in an easy reliable way ...
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local file_path_base64=$(echo "$file" | base64 -w0)
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mkdir -p /var/cache/yunohost/appconfbackup/
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cat "$file" > "/var/cache/yunohost/appconfbackup/original_${file_path_base64}"
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fi
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# If backup_file_checksum isn't empty, ynh_backup_if_checksum_is_different has made a backup
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if [ -n "${backup_file_checksum-}" ]; then
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# Print the diff between the previous file and the new one.
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# diff return 1 if the files are different, so the || true
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diff --report-identical-files --unified --color=always "$backup_file_checksum" "$file" >&2 || true
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fi
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# Unset the variable, so it wouldn't trig a ynh_store_file_checksum without a ynh_backup_if_checksum_is_different before it.
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unset backup_file_checksum
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set -o xtrace # set -x
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}
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# Verify the checksum and backup the file if it's different
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#
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# usage: ynh_backup_if_checksum_is_different /path/to/file
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#
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# This helper is primarily meant to allow to easily backup personalised/manually
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# modified config files.
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ynh_backup_if_checksum_is_different() {
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set +o xtrace # set +x
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local file=$1
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local checksum_setting_name=checksum_${file//[\/ ]/_} # Replace all '/' and ' ' by '_'
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local checksum_value=$(ynh_app_setting_get --key="$checksum_setting_name")
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# backup_file_checksum isn't declare as local, so it can be reuse by ynh_store_file_checksum
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backup_file_checksum=""
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if [ -n "$checksum_value" ]; then # Proceed only if a value was stored into the app settings
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if [ -e "$file" ] && ! echo "$checksum_value $file" | md5sum --check --status; then # If the checksum is now different
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backup_file_checksum="/var/cache/yunohost/appconfbackup/$file.backup.$(date '+%Y%m%d.%H%M%S')"
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mkdir --parents "$(dirname "$backup_file_checksum")"
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cp --archive "$file" "$backup_file_checksum" # Backup the current file
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ynh_print_warn "File $file has been manually modified since the installation or last upgrade. So it has been duplicated in $backup_file_checksum"
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echo "$backup_file_checksum" # Return the name of the backup file
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if ynh_in_ci_tests; then
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local file_path_base64=$(echo "$file" | base64 -w0)
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if test -e "/var/cache/yunohost/appconfbackup/original_${file_path_base64}"; then
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ynh_print_warn "Diff with the original file:"
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diff --report-identical-files --unified --color=always "/var/cache/yunohost/appconfbackup/original_${file_path_base64}" "$file" >&2 || true
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fi
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fi
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fi
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fi
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set -o xtrace # set -x
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}
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# Delete a file checksum from the app settings
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#
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# usage: ynh_delete_file_checksum /path/to/file
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ynh_delete_file_checksum() {
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local file=$1
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local checksum_setting_name=checksum_${file//[\/ ]/_} # Replace all '/' and ' ' by '_'
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ynh_app_setting_delete --key="$checksum_setting_name"
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}
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