[enh] Handle the migration from ownCloud app

README.md

@@ -11,10 +11,6 @@ you can synchronize your files over your devices.
 
 ![](https://github.com/nextcloud/screenshots/blob/master/files/filelist.png)
 
-## TODO
-
- * Manage the upgrade from ownCloud
-
 ## Features
 
 In addition to Nextcloud core features, the following are made available with
@@ -36,6 +32,38 @@ Also, note we made the choice to disable third-parties applications at the
 upgrade. It allows to prevent an unstable - and sometimes broken - Nextcloud
 installation. You will just have to manually activate them after the upgrade.
 
+## Migrate from ownCloud
+
+**This is not considered as stable yet, please do it with care and only for
+testing!**
+
+This package handle the migration from ownCloud to Nextcloud. For that, your
+ownCloud application must be **up-to-date** in YunoHost.
+
+You will then have to upgrade your ownCloud application with this repository.
+This can only be done from the command-line interface - e.g. through SSH. Once
+you're connected, you simply have to execute the following:
+
+```bash
+sudo yunohost app upgrade -u https://github.com/YunoHost-Apps/nextcloud_ynh owncloud --verbose
+```
+
+The `--verbose` option will let you see the full output. If you encounter any
+issue, please paste it.
+
+Note that a cron job will be executed at some time after the end of this
+command. You must wait that before doing any other application operations!
+You should see that Nextcloud is installed after that.
+
+Note that it does not change the application label nor the URL. To rename
+the label, you can execute the following - replace `Nextcloud` with whatever
+you want:
+
+```bash
+sudo yunohost app setting nextcloud label -v "Nextcloud"
+sudo yunohost app ssowatconf
+```
+
 ## Links
 
  * Report a bug: https://dev.yunohost.org/projects/apps/issues

conf/owncloud-migration.sh

@@ -0,0 +1,21 @@
+#!/bin/bash
+
+set -u
+
+app="#APP#"
+
+# rename hook
+hooks_dir="/etc/yunohost/hooks.d/post_user_create"
+[[ -f "${hooks_dir}/50-${app}" ]] \
+  && mv "${hooks_dir}/50-${app}" "${hooks_dir}/50-nextcloud"
+
+# move yunohost app settings
+apps_dir="/etc/yunohost/apps"
+if [[ -d "${apps_dir}/${app}" ]]; then
+  yunohost app setting "$app" id -v nextcloud
+  mv "${apps_dir}/${app}" "${apps_dir}/nextcloud"
+  yunohost app ssowatconf --quiet
+fi
+
+# remove cron job
+rm /etc/cron.d/owncloud-migration

scripts/upgrade

@@ -10,20 +10,59 @@ app=$APPNAME
 dbname=$app
 dbuser=$app
 
-# FIXME: Upgrading from ownCloud is not supported yet,
-# see http://blog.jospoortvliet.com/2016/06/migrating-to-nextcloud-9.html
-[[ $YNH_APP_INSTANCE_NAME == $app ]] || ynh_die \
-"Upgrading from ownCloud to Nextcloud is not supported yet."
-
 # Source app helpers
 source /usr/share/yunohost/helpers
 
+# Migrate from ownCloud to Nextcloud
+if [[ $YNH_APP_INSTANCE_NAME != $app ]]; then
+  [[ $YNH_APP_ID == owncloud ]] \
+    || ynh_die "Incompatible application to migrate to Nextcloud"
+
+  # check that Nextcloud is not already installed
+  (sudo yunohost app list --installed -f "$app" | grep -q id) \
+    && ynh_die "Nextcloud is already installed"
+
+  # retrieve ownCloud domain setting
+  real_app=$YNH_APP_INSTANCE_NAME
+  domain=$(ynh_app_setting_get "$real_app" domain)
+
+  # remove nginx and php-fpm configuration files
+  sudo rm -f \
+      "/etc/nginx/conf.d/${domain}.d/${real_app}.conf" \
+      "/etc/php5/fpm/pool.d/${real_app}.conf" \
+      "/etc/cron.d/${real_app}"
+
+  # reload services to disable ownCloud
+  sudo service php5-fpm reload || true
+  sudo service nginx reload || true
+
+  # remove dependencies package
+  ynh_package_remove owncloud-deps || true
+
+  # clean new destination and data directories
+  DESTDIR="/var/www/$app"
+  DATADIR="/home/yunohost.app/${app}/data"
+  sudo rm -rf "$DESTDIR" "/home/yunohost.app/$app"
+
+  # rename ownCloud folders
+  sudo mv "/var/www/$real_app" "$DESTDIR"
+  sudo mv "/home/yunohost.app/$real_app" "/home/yunohost.app/$app"
+  sudo sed -ri "s#^(\s*'datadirectory' =>).*,#\1 '${DATADIR}',#" \
+      "/var/www/${app}/config/config.php"
+
+  # rename ownCloud system group and account
+  sudo groupmod -n "$app" "$real_app"
+  sudo usermod -l "$app" "$real_app"
+else
+  real_app=$app
+fi
+
 # Retrieve app settings
-domain=$(ynh_app_setting_get "$app" domain)
-path=$(ynh_app_setting_get "$app" path)
+domain=$(ynh_app_setting_get "$real_app" domain)
+path=$(ynh_app_setting_get "$real_app" path)
 path=${path%/}
-dbpass=$(ynh_app_setting_get "$app" mysqlpwd)
-user_home=$(ynh_app_setting_get "$app" user_home)
+dbpass=$(ynh_app_setting_get "$real_app" mysqlpwd)
+user_home=$(ynh_app_setting_get "$real_app" user_home)
 
 # Check destination directory
 DESTDIR="/var/www/$app"
@@ -122,7 +161,7 @@ if [[ -z "${user_home:-}" ]]; then
   sudo cat "${DATADIR}/mount.json" >/dev/null 2>&1 \
     && user_home=1 \
     || user_home=0
-  ynh_app_setting_set "$app" user_home "$user_home"
+  ynh_app_setting_set "$real_app" user_home "$user_home"
 fi
 
 # Enable External Storage and create local mount to home folder as needed
@@ -161,8 +200,8 @@ sudo chmod 640 "${DESTDIR}/config/config.php"
 sudo chmod 755 /home/yunohost.app
 
 # Set SSOwat rules
-ynh_app_setting_set "$app" unprotected_uris "/"
-ynh_app_setting_set "$app" skipped_regex \
+ynh_app_setting_set "$real_app" unprotected_uris "/"
+ynh_app_setting_set "$real_app" skipped_regex \
     "$(sed 's/[\.\-]/\%&/g' <<< $domain)/%.well%-known/.*"
 
 # Reload services
@@ -177,6 +216,23 @@ sudo cp ../conf/nextcloud.cron "$cron_path"
 sudo chmod 644 "$cron_path"
 _exec_occ background:cron
 
+# Finish ownCloud migration
+if [[ $real_app != $app ]]; then
+  echo "ownCloud has been successfully migrated to Nextcloud! \
+A last scheduled operation will run in a couple of minutes to finish the \
+migration in YunoHost side. Do not proceed any application operation while \
+you don't see Nextcloud as installed." >&2
+
+  # install cron job and script for final migration step
+  script_path="/usr/local/sbin/owncloud-migration.sh"
+  sed -i "s@#APP#@${real_app}@g" ../conf/owncloud-migration.sh
+  sudo cp ../conf/owncloud-migration.sh "$script_path"
+  sudo chmod 755 "$script_path"
+  cron_path="/etc/cron.d/owncloud-migration"
+  echo "*/1 * * * * root $script_path" | sudo tee "$cron_path" >/dev/null
+  sudo chmod 644 "$cron_path"
+fi
+
 # Warn about possible disabled apps
 echo "Note that if you've installed some third-parties Nextcloud applications, \
 they are probably disabled and you'll have to manually activate them again." >&2