Application packaging ## Shell helpers Since YunoHost 2.4 release, **new shell helpers** are available to ease common packaging tasks like password generation, MySQL database creation… Usage examples are available in the [example application](https://github.com/YunoHost/example_ynh/blob/master/scripts/install). We advise to use them. You can find them on this [repository](https://github.com/YunoHost/yunohost/blob/unstable/data/helpers.d). To use them, you need to add following lines in the shell scripts: ```bash # Source app helpers source /usr/share/yunohost/helpers ``` ### Available helpers list (non exhaustive) #### Database ```bash ynh_mysql_execute_as_root SQL DB ``` > Runs the SQL command `SQL` as database root user on `DB` database (this last argument is optional). ```bash ynh_mysql_execute_file_as_root FILE DB ``` > Runs the SQL commands listed inside `FILE` as root user on `DB` database (this last argument is optional). ```bash ynh_mysql_create_db DB USER PWD ``` > Create the `DB` database and grants all rights to `USER` (created on the fly with `PASSWORD` password). ```bash ynh_mysql_drop_db DB ``` > Delete the `DB` database. ```bash ynh_mysql_dump_db DB > ./FILE ``` > Exports the `DB` database into the `FILE` file. #### Debian packages handling ```bash ynh_package_is_installed PACKAGE ``` > Tests if the Debian package `PACKAGE` is installed on the system. > Read command output to know the result. e.g: > ```bash > if ! ynh_package_is_installed "yunohost" ; then > echo "Oops, package is not installed" > else > echo "Package is installed" > fi > ``` ```bash ynh_package_version PACKAGE ``` > Returns the installed version number of `PACKAGE`. ```bash ynh_package_update ``` > Updates the packages list (`apt update`) in a silent and non-interactive way. **Be careful, the following commands are to be avoided when possible. Installing (and even more removing) a package without handling conflicts and dependencies is risky. That will be improved in future Yunohost versions.** ```bash ynh_package_install PACKAGE1 PACKAGE2 ``` > Installs (`apt install`) `PACKAGE1`, `PACKAGE2`… packages, in a non interactive and silent way. ```bash ynh_package_autoremove PACKAGE1 PACKAGE2 ``` > Removes (`apt-get autoremove`) `PACKAGE1`, `PACKAGE2`… packages in a silent and non-interactive way. #### Apps configuration ```bash ynh_app_setting_set APP KEY VALUE ``` > Store the setting named `KEY` with value `VALUE` for the app `APP`. This allows to reuse it later (typically in the `upgrade` script), or so that YunoHost can autoconfigure the SSO. > The settings are stored in the /etc/yunohost/apps/${APP}/settings.yml file. > For example, to store the visibility setting (private or public app), you can use : > ```bash > ynh_app_setting_set my_app is_public "yes" > ``` The SSO uses app stored settings to allow or deny public access to HTTP resources. There are 6 configuration keys : `skipped_uris`, `unprotected_uris` and `protected_uris` are relative to app path. Example: > ```bash > ynh_app_setting_set app_name skipped_uris "/blog" > ``` > Matches the /blog path of the application: https://domain.tld/path_app/blog and everything under this path, but not https://domain.tld/path_app/. **skipped_uris** An URL set with *skipped_uris* key will be totally ignored by the SSO, which means that the access will be public and the logged-in user information will not be passed to the app. **unprotected_uris** An URL set with *unprotected_uris* key will be accessible publicly, but if an user is logged in, his information will be accessible (though HTTP headers) to the app. **protected_uris** An URL set with *protected_uris* will be blocked by the SSO and accessible only to authenticated and authorized users. `skipped_regex`, `unprotected_uris` and `protected_regex` are regex counterparts of the above keys. > The syntax is **not** the "standard" regex syntax ([PCRE](https://en.wikipedia.org/wiki/Perl_Compatible_Regular_Expressions)) but [Lua patterns](http://lua-users.org/wiki/PatternsTutorial). The regex patterns match the whole URL, unlike the string patterns (which match only the app-local part of the URL, as detailed above). This means you must write complete patterns including the *domain* and *path*. > For example, to use *skipped_regex* to match /blog followed by a 1+ digit number: > ```bash > ynh_app_setting_set app_name skipped_regex "$domain$path/blog%?%d+$" > ``` > This may lead to an issue : if $domain or $path contain a dash (-), it will interpreted as a pattern magic char. That is why dashes must be escaped with a %. > ```bash > domainregex=$(echo "$domain" | sed 's/-/\%&/g') > pathregex=$(echo "$path" | sed 's/-/\%&/g') > ynh_app_setting_set app_name skipped_regex "$domainregex$pathregex/blog%?%d+$" > ``` ```bash ynh_app_setting_get APP KEY ``` > Get the value of the setting named `KEY` for the `APP` app. > Example : > ```bash > is_public=$(ynh_app_setting_get app_name is_public) > ``` ```bash ynh_app_setting_delete APP KEY ``` Delete the setting named `KEY` for the `APP` app. #### Users management ```bash ynh_user_exists USERNAME ``` > Checks the existence of `USERNAME` user in YunoHost. > Command return code must be checked to know the result. > Example: > ```bash > if ynh_user_exists "johndoe" ; then > echo "This user exists!" > fi > ``` ```bash ynh_user_get_info USERNAME KEY ``` > Get the `KEY` information on `USERNAME` user. > Possible `KEY` values are: > - firstname > - fullname > - lastname > - mail > - mail-aliases > - mailbox-quota > Example: > ```bash > mailadmin=$(ynh_user_get_info $admin mail) > ``` ```bash ynh_system_user_exists USERNAME ``` > Checks if the `USERNAME` unix user exists. > Command return code must be checked to know the result. > Example: > ```bash > if ynh_system_user_exists "www-data" ; then > echo "User exists on system!" > fi > ``` #### Other commands ```bash ynh_string_random LENGTH ``` > Generates a random string of `LENGTH` chars (defaults to 24). ```bash ynh_die MSG RETCODE ``` > Displays the `MSG` message on stderr and exits the script with `RETCODE` return code (defaults to 1).
**Following commands are to be replaced (or even deleted) in future YunoHost versions.** ```bash sudo yunohost app checkport ``` > This helper checks the port and returns an error if the port is already in use. > Command return code must be checked to know the result. > Example: > ```bash > port=DEFAULT_PORT > while ! sudo yunohost app checkport $port ; do > port=$((port+1)) > done > ``` ```bash sudo yunohost firewall allow [--no-upnp] {TCP,UDP,Both} PORT ``` > Opens the port number `PORT` on the firewall, for TCP, UDP or both. > Automatic port opening via upnp may be disabled on this port using `--no-upnp` ```bash sudo yunohost firewall disallow {TCP,UDP,Both} PORT ``` > Closes the port number `PORT` on the firewall for TCP, UDP or both. ```bash sudo yunohost app checkurl DOMAINPATH -a APP ``` > Checks `DOMAIN`/`PATH` url availability. Useful for web apps to make sure the chosen URL is not already taken by another app. If the URL is available, that commands register for the `APP` application. > **Note**: do not prepend `http://` or `https://` to `DOMAINPATH`. ```bash sudo yunohost app addaccess [--users=USER] APP ``` > Allow the `USER` user to access `APP`. ```bash sudo yunohost app removeaccess --users=USER APP ``` > Remove the access authorization to `APP` from `USER` user. ```bash sudo yunohost service remove NAME ``` > Remove the service `NAME` from the YunoHost management interface. ```bash sudo yunohost app ssowatconf ``` > This commands rebuilds the SSO configuration. It is called automatically at the end of any script, but you may want to call it by hand before.