258 lines
10 KiB
Bash
258 lines
10 KiB
Bash
# Execute a command as another user
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# usage: exec_as USER COMMAND [ARG ...]
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exec_as() {
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local USER=$1
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shift 1
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if [[ $USER = $(whoami) ]]; then
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eval "$@"
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else
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sudo -u "$USER" "$@"
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fi
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}
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# Need also the helper https://github.com/YunoHost-Apps/Experimental_helpers/blob/master/ynh_handle_getopts_args/ynh_handle_getopts_args
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# Make the main steps to migrate an app to its fork.
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#
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# This helper has to be used for an app which needs to migrate to a new name or a new fork
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# (like owncloud to nextcloud or zerobin to privatebin).
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#
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# This helper will move the files of an app to its new name
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# or recreate the things it can't move.
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#
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# To specify which files it has to move, you have to create a "migration file", stored in ../conf
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# This file is a simple list of each file it has to move,
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# except that file names must reference the $app variable instead of the real name of the app,
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# and every instance-specific variables (like $domain).
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# $app is especially important because it's this variable which will be used to identify the old place and the new one for each file.
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#
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# If a database exists for this app, it will be dumped and then imported in a newly created database, with a new name and new user.
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# Don't forget you have to then apply these changes to application-specific settings (depends on the packaged application)
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#
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# Same things for an existing user, a new one will be created.
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# But the old one can't be removed unless it's not used. See below.
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#
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# If you have some dependencies for your app, it's possible to change the fake debian package which manages them.
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# You have to fill the $pkg_dependencies variable, and then a new fake package will be created and installed,
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# and the old one will be removed.
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# If you don't have a $pkg_dependencies variable, the helper can't know what the app dependencies are.
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#
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# The app settings.yml will be modified as follows:
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# - finalpath will be changed according to the new name (but only if the existing $final_path contains the old app name)
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# - The checksums of php-fpm and nginx config files will be updated too.
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# - If there is a $db_name value, it will be changed.
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# - And, of course, the ID will be changed to the new name too.
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#
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# Finally, the $app variable will take the value of the new name.
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# The helper will set the $migration_process variable to 1 if a migration has been successfully handled.
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#
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# You have to handle by yourself all the migrations not done by this helper, like configuration or special values in settings.yml
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# Also, at the end of the upgrade script, you have to add a post_migration script to handle all the things the helper can't do during YunoHost upgrade (mostly for permission reasons),
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# especially remove the old user, move some hooks and remove the old configuration directory
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# To launch this script, you have to move it elsewhere and start it after the upgrade script.
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# `cp ../conf/$script_post_migration /tmp`
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# `(cd /tmp; echo "/tmp/$script_post_migration" | at now + 2 minutes)`
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#
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# usage: ynh_handle_app_migration migration_id migration_list
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# | arg: -i, --migration_id= - ID from which to migrate
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# | arg: -l, --migration_list= - File specifying every file to move (one file per line)
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ynh_handle_app_migration () {
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# Need for end of install
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ynh_package_install at
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#=================================================
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# LOAD SETTINGS
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#=================================================
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old_app=$YNH_APP_INSTANCE_NAME
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local old_app_id=$YNH_APP_ID
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local old_app_number=$YNH_APP_INSTANCE_NUMBER
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# Declare an array to define the options of this helper.
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declare -Ar args_array=( [i]=migration_id= [l]=migration_list= )
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# Get the id from which to migrate
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local migration_id
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# And the file with the paths to move
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local migration_list
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# Manage arguments with getopts
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ynh_handle_getopts_args "$@"
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# Get the new app id in the manifest
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local new_app_id=$(grep \"id\": ../manifest.json | cut -d\" -f4)
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if [ $old_app_number -eq 1 ]; then
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local new_app=$new_app_id
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else
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local new_app=${new_app_id}__${old_app_number}
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fi
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#=================================================
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# CHECK IF IT HAS TO MIGRATE
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#=================================================
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migration_process=0
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if [ "$old_app_id" == "$new_app_id" ]
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then
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# If the 2 id are the same
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# No migration to do.
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echo 0
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return 0
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else
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if [ "$old_app_id" != "$migration_id" ]
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then
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# If the new app is not the authorized id, fail.
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ynh_die --message "Incompatible application for migration from $old_app_id to $new_app_id"
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fi
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echo "Migrate from $old_app_id to $new_app_id" >&2
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#=================================================
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# CHECK IF THE MIGRATION CAN BE DONE
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#=================================================
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# TODO Handle multi instance apps...
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# Check that there is not already an app installed for this id.
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(yunohost app list --installed -f "$new_app" | grep -q id) \
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&& ynh_die "$new_app is already installed"
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#=================================================
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# CHECK THE LIST OF FILES TO MOVE
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#=================================================
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local temp_migration_list="$(tempfile)"
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# Build the list by removing blank lines and comment lines
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sed '/^#.*\|^$/d' "../conf/$migration_list" > "$temp_migration_list"
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# Check if there is no file in the destination
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local file_to_move=""
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while read file_to_move
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do
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# Replace all occurences of $app by $new_app in each file to move.
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local move_to_destination="${file_to_move//\$app/$new_app}"
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test -e "$move_to_destination" && ynh_die "A file named $move_to_destination already exists."
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done < "$temp_migration_list"
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#=================================================
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# COPY YUNOHOST SETTINGS FOR THIS APP
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#=================================================
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local settings_dir="/etc/yunohost/apps"
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cp -a "$settings_dir/$old_app" "$settings_dir/$new_app"
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cp -a ../{scripts,conf} "$settings_dir/$new_app"
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# Replace the old id by the new one
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ynh_replace_string "\(^id: .*\)$old_app" "\1$new_app" "$settings_dir/$new_app/settings.yml"
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# INFO: There a special behavior with yunohost app setting:
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# if the id given in argument does not match with the id
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# stored in the config file, the config file will be purged.
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# That's why we use sed instead of app setting here.
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# https://github.com/YunoHost/yunohost/blob/c6b5284be8da39cf2da4e1036a730eb5e0515096/src/yunohost/app.py#L1316-L1321
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# Change the label if it's simply the name of the app
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old_label=$(ynh_app_setting_get $new_app label)
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if [ "${old_label,,}" == "$old_app_id" ]
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then
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# Build the new label from the id of the app. With the first character as upper case
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new_label=$(echo $new_app_id | cut -c1 | tr [:lower:] [:upper:])$(echo $new_app_id | cut -c2-)
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ynh_app_setting_set $new_app label $new_label
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fi
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yunohost tools shell -c "from yunohost.permission import permission_delete; permission_delete('$old_app.main', force=True, sync_perm=False)"
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yunohost tools shell -c "from yunohost.permission import permission_create; permission_create('$new_app.main', url='/' , sync_perm=True)"
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#=================================================
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# MOVE FILES TO THE NEW DESTINATION
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#=================================================
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while read file_to_move
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do
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# Replace all occurence of $app by $new_app in each file to move.
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move_to_destination="$(eval echo "${file_to_move//\$app/$new_app}")"
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local real_file_to_move="$(eval echo "${file_to_move//\$app/$old_app}")"
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echo "Move file $real_file_to_move to $move_to_destination" >&2
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mv "$real_file_to_move" "$move_to_destination"
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done < "$temp_migration_list"
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#=================================================
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# UPDATE SETTINGS KNOWN ENTRIES
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#=================================================
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# Replace nginx checksum
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ynh_replace_string "\(^checksum__etc_nginx.*\)_$old_app" "\1_$new_app/" "$settings_dir/$new_app/settings.yml"
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# Replace php5-fpm checksums
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ynh_replace_string "\(^checksum__etc_php5.*[-_]\)$old_app" "\1$new_app/" "$settings_dir/$new_app/settings.yml"
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# Replace final_path
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ynh_replace_string "\(^final_path: .*\)$old_app" "\1$new_app" "$settings_dir/$new_app/settings.yml"
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#=================================================
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# MOVE THE DATABASE
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#=================================================
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db_pwd=$(ynh_app_setting_get $old_app mysqlpwd)
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db_name=$dbname
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# Check if a database exists before trying to move it
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local mysql_root_password=$(cat $MYSQL_ROOT_PWD_FILE)
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if [ -n "$db_name" ] && mysqlshow -u root -p$mysql_root_password | grep -q "^| $db_name"
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then
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new_db_name=$(ynh_sanitize_dbid $new_app)
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echo "Rename the database $db_name to $new_db_name" >&2
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local sql_dump="/tmp/${db_name}-$(date '+%s').sql"
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# Dump the old database
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ynh_mysql_dump_db "$db_name" > "$sql_dump"
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# Create a new database
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ynh_mysql_setup_db $new_db_name $new_db_name $db_pwd
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# Then restore the old one into the new one
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ynh_mysql_connect_as $new_db_name $db_pwd $new_db_name < "$sql_dump"
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# Remove the old database
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ynh_mysql_remove_db $db_name $db_name
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# And the dump
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ynh_secure_remove --file="$sql_dump"
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# Update the value of $db_name
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db_name=$new_db_name
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ynh_app_setting_set $new_app db_name $db_name
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fi
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#=================================================
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# CHANGE THE FAKE DEPENDENCIES PACKAGE
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#=================================================
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# Check if a variable $pkg_dependencies exists
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# If this variable doesn't exist, this part shall be managed in the upgrade script.
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if [ -n "${pkg_dependencies:-}" ]
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then
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# Define the name of the package
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local old_package_name="${old_app//_/-}-ynh-deps"
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local new_package_name="${new_app//_/-}-ynh-deps"
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if ynh_package_is_installed "$old_package_name"
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then
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# Install a new fake package
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app=$new_app
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ynh_install_app_dependencies $pkg_dependencies
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# Then remove the old one
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app=$old_app
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ynh_remove_app_dependencies
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fi
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fi
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#=================================================
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# UPDATE THE ID OF THE APP
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#=================================================
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app=$new_app
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# Set migration_process to 1 to inform that an upgrade has been made
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migration_process=1
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fi
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}
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