Initial __nextcloud_app type

Overall complete, more functionalitly is currently out of scope.

type/__nextcloud_app/explorer/state

@@ -0,0 +1,38 @@
+#!/bin/sh -e
+# __nextcloud_app/explorer/state
+
+# Outputs the current state of the app. There are:
+#  - `enabled` if the app is enabled
+#  - `disabled` if the app is disabled
+#  - `absent` if the app does not exist
+#  - nothing if nextcloud is not installed
+
+
+# Get the app id
+appid="$__object/parameter/appid"
+if [ -f "$appid" ]; then
+    appid="$(cat "$appid")"
+else
+    appid="$__object_id"
+fi
+
+# Get the installation directory
+cloud="$(cat "$__object/parameter/cloud")"
+www_user="$(cat "$__object/parameter/www-user")"
+
+
+# Check if the installation directory exists
+if [ -d "$cloud" ]; then
+    # if those files exist, everything should be fine
+    if [ -f "$cloud/occ" ] && [ -f "$cloud/config/config.php" ]; then
+        # Check if the app exists in the correct user context
+        su -s /bin/sh -l "$www_user" -- -e <<SU
+cd '$cloud'
+
+# Output all apps and search in which category it is
+php occ --no-warnings --no-interaction --no-ansi --output=plain app:list \
+    | awk '\$0 == "Enabled:"{state="enabled"} \$0 == "Disabled:"{state="disabled"}
+           /^  - ${appid}:?/{found=1; print state; exit} END{if(!found) print "absent"}'
+SU
+    fi
+fi

type/__nextcloud_app/gencode-remote

@@ -0,0 +1,85 @@
+#!/bin/sh -e
+# __nextcloud_app/gencode-remote
+
+# Handles a nextcloud app.
+
+
+# Call the nextcloud occ script as the intended user. Maybe this can be a bit
+# more effictive with user switching, but currently the easiest way of doing
+# it.
+#
+# All arguments are directly passed to occ (injection alarm ;-) )
+occ() {
+    # su creates a new shell, so it does not affect the current session
+    #  will not use -q as it supresses errors, too
+    cat << SHELL
+su -s /bin/sh -l "$www_user" -- -e <<'SU'
+cd '$cloud' && php occ --no-warnings --no-interaction --no-ansi $@
+SU
+SHELL
+}
+
+
+# Get the app id
+appid="$__object/parameter/appid"
+if [ -f "$appid" ]; then
+    appid="$(cat "$appid")"
+else
+    appid="$__object_id"
+fi
+
+# Get the app state
+state_is="$(cat "$__object/explorer/state")"
+state_should="$(cat "$__object/parameter/state")"
+
+# Get general parameters
+cloud="$(cat "$__object/parameter/cloud")"
+www_user="$(cat "$__object/parameter/www-user")"
+
+
+# Abort if nextcloud is not installed
+if [ -z "$state_is" ]; then
+    printf "No nextcloud installation could be detected in '%s' ..\n" "$cloud" >&2
+    echo "Use the type __nextcloud to ensure the installation and mark it as dependency for this type!" >&2
+    exit 2
+fi
+
+
+# Check if the state changes
+if [ "$state_is" != "$state_should" ]; then
+    # check what to do
+    case "$state_should" in
+        enabled)
+            if [ "$state_is" = "disabled" ]; then
+                occ app:enable "'$appid'"
+                echo enabled >> "$__messages_out"
+            else
+                occ app:install "'$appid'"
+                echo installed >> "$__messages_out"
+            fi
+            ;;
+
+        disabled)
+            if [ "$state_is" = "absent" ]; then
+                occ app:install --keep-disabled "'$appid'"
+                echo installed >> "$__messages_out"
+            else
+                occ app:disable "'$appid'"
+                echo disabled >> "$__messages_out"
+            fi
+            ;;
+
+        present)
+            if [ "$state_is" = "absent" ]; then
+                occ app:install "'$appid'"
+                echo installed >> "$__messages_out"
+            fi
+            # else, everything is ok
+            ;;
+
+        absent)
+            occ app:remove "'$appid'"
+            echo removed >> "$__messages_out"
+            ;;
+    esac
+fi

type/__nextcloud_app/man.rst

@@ -0,0 +1,131 @@
+cdist-type__nextcloud_app(7)
+============================
+
+NAME
+----
+cdist-type__nextcloud_app - Managese a Nextcloud app installation
+
+
+DESCRIPTION
+-----------
+This types manages an app for a Nextcloud installation. For now, you can only
+(un-)install or enable/disable an app.
+
+The object id is the appid of the app which will be managed by this type. It
+will be overwritten by the parameter `--appid`. See this parameter for more
+information about the appid.
+
+
+REQUIRED PARAMETERS
+-------------------
+cloud
+    The absolute path of the Nextcloud installation.
+
+
+OPTIONAL PARAMETERS
+-------------------
+state
+    The state of the app. Can be the following:
+
+    present *(default)*
+        The app is installed.
+
+    enabled
+        The app is installed and enabled.
+
+    disabled
+        The app is installed, but disabled.
+
+    absent
+        The app is not installed.
+
+appid
+    The appid is the uniquie identifier for an app in the Nextcloud app store.
+    It is required to know which app should be installed, which is expressed
+    via the appid. Apps who are shipped by the installation can not be removed.
+    Doing this will throw an error at exeuction time.
+
+    To find the appid, you must select the app in the Nextcloud app menu or on
+    the app page in the Nextcloud app store. Then, examine the URL and use the
+    lastest part (e.g. "the filename") as appid.
+
+www-user
+    The unix user which will be used to execute Nextcloud related stuff. You
+    should always use the same user for all Nextcloud interactions, for the
+    webserver and cli execution. As default, `www-data` will be used.
+
+
+MESSAGES
+--------
+installed
+    The app was installed.
+
+enabled
+    The app is already installed and was enabled.
+
+disabled
+    The app is already installed and was disabled.
+
+removed
+    The app was removed.
+
+
+EXAMPLES
+--------
+
+.. code-block:: sh
+
+    # nextcloud base installation
+    __nextcloud cloud $args
+
+    # install the music app
+    require="__nextcloud/cloud" __nextcloud_app music \
+        --cloud /var/www/html/cloud/ --state enabled
+
+    # enable a shipped app (already installed)
+    require="__nextcloud/cloud" __nextcloud_app files_external \
+        --cloud /var/www/html/cloud/ --state enabled
+
+    # remove some app
+    require="__nextcloud/cloud" __nextcloud_app drawio \
+        --cloud /var/www/html/cloud/ --state absent
+
+
+NOTES
+-----
+Currently, it manages just if the app is installed and enabled. Further
+implementation is possible, but not done yet. This contains the management of
+the app settings (via ``occ config:app:*``) and further finetuning to the
+possibilities of installation and enablement (force-enable an app or restrict
+enablement only to some groups).
+
+Special app settings could also be written as a new type which completly
+handles this one app with all configuration options.
+
+Upgrading an Nextcloud app may be possible, but not the scope of this type.
+Also, the upgrade can not be done to a given version, which results that this
+type will loose the control over the state of the app. Installing the app
+manually or hooking into the Nextcloud code is too unsafe and complex, in
+addition it will be used rarely. Most admins would propably just update the app
+via the web interface.
+
+
+SEE ALSO
+--------
+`Nextcloud app store <https://apps.nextcloud.com/>`_
+
+:strong:`cdist-type__nextcloud`\ (7)
+:strong:`cdist-type__nextcloud_user`\ (7)
+
+
+AUTHORS
+-------
+Matthias Stecher <matthiasstecher at gmx.de>
+
+
+COPYING
+-------
+Copyright \(C) 2020 Matthias Stecher.
+You can redistribute it and/or modify it under the terms of the GNU
+General Public License as published by the Free Software Foundation,
+either version 3 of the License, or (at your option) any later version.

type/__nextcloud_app/parameter/default/state

@@ -0,0 +1 @@
+present

type/__nextcloud_app/parameter/default/www-user

@@ -0,0 +1 @@
+www-data

type/__nextcloud_app/parameter/optional

@@ -0,0 +1,3 @@
+state
+appid
+www-user

type/__nextcloud_app/parameter/required

@@ -0,0 +1 @@
+cloud

type/__nextcloud_user/man.rst

@@ -143,7 +143,7 @@ EXAMPLES
 .. code-block:: sh
 
     # nextcloud base installation
-   __nextcloud cloud
+    __nextcloud cloud $args
 
     # setups an user, but do not touch it after it was created
     require="__nextcloud/cloud" __nextcloud_user foo \