doc/pages/06.contribute/10.packaging_apps/80.resources/11.helpers/packaging_apps_resources.md

title	template	taxonomy	routes
App resources	docs	category docs	default /packaging_apps_resources

System User

Provision a system user to be used by the app. The username is exactly equal to the app id

Example:

[resources.system_user]
# (empty - defaults are usually okay)

Properties:

• allow_ssh: (default: False) Adds the user to the ssh.app group, allowing SSH connection via this user
• allow_sftp: (defalt: False) Adds the user to the sftp.app group, allowing SFTP connection via this user

Provision/Update:

• will create the system user if it doesn't exists yet
• will add/remove the ssh/sftp.app groups

Deprovision:

• deletes the user and group

Install Dir

Creates a directory to be used by the app as the installation directory, typically where the app sources and assets are located. The corresponding path is stored in the settings as install_dir

Example:

[resources.install_dir]
# (empty - defaults are usually okay)

Properties:

• dir: (default: /var/www/__APP__) The full path of the install dir
• owner: (default: __APP__:rx) The owner (and owner permissions) for the install dir
• group: (default: __APP__:rx) The group (and group permissions) for the install dir

Provision/Update:

• during install, the folder will be deleted if it already exists (FIXME: is this what we want?)
• if the dir path changed and a folder exists at the old location, the folder will be mv'ed to the new location
• otherwise, creates the directory if it doesn't exists yet
• (re-)apply permissions (only on the folder itself, not recursively)
• save the value of dir as install_dir in the app's settings, which can be then used by the app scripts ($install_dir) and conf templates (__INSTALL_DIR__)

Deprovision:

• recursively deletes the directory if it exists

Legacy management:

• In the past, the setting was called final_path. The code will automatically rename it as install_dir.
• As explained in the 'Provision/Update' section, the folder will also be moved if the location changed

Data Dir

Creates a directory to be used by the app as the data store directory, typically where the app multimedia or large assets added by users are located. The corresponding path is stored in the settings as data_dir. This resource behaves very similarly to install_dir.

Example:

[resources.data_dir]
# (empty - defaults are usually okay)

Properties:

• dir: (default: /home/yunohost.app/__APP__) The full path of the data dir
• owner: (default: __APP__:rx) The owner (and owner permissions) for the data dir
• group: (default: __APP__:rx) The group (and group permissions) for the data dir

Provision/Update:

• if the dir path changed and a folder exists at the old location, the folder will be mv'ed to the new location
• otherwise, creates the directory if it doesn't exists yet
• (re-)apply permissions (only on the folder itself, not recursively)
• save the value of dir as data_dir in the app's settings, which can be then used by the app scripts ($data_dir) and conf templates (__DATA_DIR__)

Deprovision:

• (only if the purge option is chosen by the user) recursively deletes the directory if it exists
• also delete the corresponding setting

Legacy management:

• In the past, the setting may have been called datadir. The code will automatically rename it as data_dir.
• As explained in the 'Provision/Update' section, the folder will also be moved if the location changed

Apt

Create a virtual package in apt, depending on the list of specified packages that the app needs. The virtual packages is called $app-ynh-deps (with _ being replaced by - in the app name, see ynh_install_app_dependencies)

Example:

[resources.apt]
packages = "nyancat, lolcat, sl"

# (this part is optional and corresponds to the legacy ynh_install_extra_app_dependencies helper)
extras.yarn.repo = "deb https://dl.yarnpkg.com/debian/ stable main"
extras.yarn.key = "https://dl.yarnpkg.com/debian/pubkey.gpg"
extras.yarn.packages = "yarn"

Properties:

• packages: Comma-separated list of packages to be installed via apt
• extras: A dict of (repo, key, packages) corresponding to "extra" repositories to fetch dependencies from

Provision/Update:

• The code literally calls the bash helpers ynh_install_app_dependencies and ynh_install_extra_app_dependencies, similar to what happens in v1.

Deprovision:

• The code literally calls the bash helper ynh_remove_app_dependencies

Ports

Book port(s) to be used by the app, typically to be used to the internal reverse-proxy between nginx and the app process.

Note that because multiple ports can be booked, each properties is prefixed by the name of the port. main is a special name and will correspond to the setting $port, whereas for example xmpp_client will correspond to the setting $port_xmpp_client.

Example:

[resources.port]
# (empty should be fine for most apps ... though you can customize stuff if absolutely needed)

main.default = 12345    # if you really want to specify a prefered value .. but shouldnt matter in the majority of cases

xmpp_client.default = 5222  # if you need another port, pick a name for it (here, "xmpp_client")
xmpp_client.exposed = "TCP" # here, we're telling that the port needs to be publicly exposed on TCP on the firewall

Properties (for every port name):

• default: The prefered value for the port. If this port is already being used by another process right now, or is booked in another app's setting, the code will increment the value until it finds a free port and store that value as the setting. If no value is specified, a random value between 10000 and 60000 is used.
• exposed: (default: false) Wether this port should be opened on the firewall and be publicly reachable. This should be kept to false for the majority of apps than only need a port for internal reverse-proxying! Possible values: false, true(=Both), Both, TCP, UDP. This will result in the port being opened on the firewall, and the diagnosis checking that a program answers on that port.
• fixed: (default: false) Tells that the app absolutely needs the specific value provided in default, typically because it's needed for a specific protocol

Provision/Update (for every port name):

• If not already booked, look for a free port, starting with the default value (or a random value between 10000 and 60000 if no default set)
• If exposed is not false, open the port in the firewall accordingly - otherwise make sure it's closed.
• The value of the port is stored in the $port setting for the main port, or $port_NAME for other NAMEs

Deprovision:

• Close the ports on the firewall if relevant
• Deletes all the port settings

Legacy management:

• In the past, some settings may have been named NAME_port instead of port_NAME, in which case the code will automatically rename the old setting.

Permissions

Configure the SSO permissions/tiles. Typically, webapps are expected to have a 'main' permission mapped to '/', meaning that a tile pointing to the $domain/$path will be available in the SSO for users allowed to access that app.

Additional permissions can be created, typically to have a specific tile and/or access rules for the admin part of a webapp.

The list of allowed user/groups may be initialized using the content of the init_{perm}_permission question from the manifest, hence init_main_permission replaces the is_public question and shall contain a group name (typically, all_users or visitors).

Example:

[resources.permissions]
main.url = "/"
# (these two previous lines should be enough in the majority of cases)

admin.url = "/admin"
admin.show_tile = false
admin.allowed = "admins"   # Assuming the "admins" group exists (cf future developments ;))

Properties (for each perm name):

• url: The relative URI corresponding to this permission. Typically / or /something. This property may be omitted for non-web permissions.
• show_tile: (default: true if url is defined) Wether or not a tile should be displayed for that permission in the user portal
• allowed: (default: nobody) The group initially allowed to access this perm, if init_{perm}_permission is not defined in the manifest questions. Note that the admin may tweak who is allowed/unallowed on that permission later on, this is only meant to initialize the permission.
• auth_header: (default: true) Define for the URL of this permission, if SSOwat pass the authentication header to the application. Default is true
• protected: (default: false) Define if this permission is protected. If it is protected the administrator won't be able to add or remove the visitors group of this permission. Defaults to 'false'.
• additional_urls: (default: none) List of additional URL for which access will be allowed/forbidden

Provision/Update:

• Delete any permissions that may exist and be related to this app yet is not declared anymore
• Loop over the declared permissions and create them if needed or update them with the new values

Deprovision:

• Delete all permission related to this app

Legacy management:

• Legacy is_public setting will be deleted if it exists

Database

Initialize a database, either using MySQL or Postgresql. Relevant DB infos are stored in settings $db_name, $db_user and $db_pwd.

NB: only one DB can be handled in such a way (is there really an app that would need two completely different DB ?...)

NB2: no automagic migration will happen in an suddenly change type from mysql to postgresql or viceversa in its life

Example:

[resources.database]
type = "mysql"   # or : "postgresql". Only these two values are supported

Properties:

• type: The database type, either mysql or postgresql

Provision/Update:

• (Re)set the $db_name and $db_user settings with the sanitized app name (replacing - and . with _)
• If $db_pwd doesn't already exists, pick a random database password and store it in that setting
• If the database doesn't exists yet, create the SQL user and DB using ynh_mysql_create_db or ynh_psql_create_db.

Deprovision:

• Drop the DB using ynh_mysql_remove_db or ynh_psql_remove_db
• Deletes the db_name, db_user and db_pwd settings

Legacy management:

• In the past, the sql passwords may have been named mysqlpwd or psqlpwd, in which case it will automatically be renamed as db_pwd