[enh] Add dropdb helper.

data/actionsmap/yunohost.yml

@@ -495,6 +495,21 @@ app:
                     full: --sql
                     help: Initial SQL file
 
+        ### app_dropdb()
+        dropdb:
+            action_help: Drop database
+            # api: POST /tools/dropdb
+            arguments:
+                db:
+                    help: Name of the database
+                -k:
+                    full: --keep-user
+                    help: Do not drop corresponding user
+                    action: store_true
+                -u:
+                    full: --user
+                    help: DB user name (db unless set)
+
         ### app_makedefault()
         makedefault:
             action_help: Redirect domain root to an app

lib/yunohost/app.py

@@ -863,6 +863,29 @@ def app_initdb(user, password=None, db=None, sql=None):
     msignals.display(m18n.n('mysql_db_initialized'), 'success')
 
 
+def app_dropdb(db, keep_user=False, user=None):
+    """
+    Drop database
+
+    Keyword argument:
+        db -- DB name
+
+    """
+    mysql_root_pwd = open('/etc/yunohost/mysql').read().rstrip()
+    mysql_command = 'mysql -u root -p%s -e "DROP DATABASE %s ;"' % (mysql_root_pwd, db)
+    if os.system(mysql_command) != 0:
+        raise MoulinetteError(errno.EIO, m18n.n('mysql_db_drop_failed'))
+    if not keep_user:
+        if user is None:
+            user=db
+        mysql_command = 'mysql -u root -p%s -e "DROP USER \'%s\'@localhost ;"' % (mysql_root_pwd, user)
+        if os.system(mysql_command) != 0:
+            raise MoulinetteError(errno.EIO, m18n.n('mysql_dbuser_drop_failed'))
+        msignals.display(m18n.n('mysql_dbuser_dropped'), 'success')
+
+    msignals.display(m18n.n('mysql_db_dropped'), 'success')
+
+
 def app_ssowatconf(auth):
     """
     Regenerate SSOwat configuration file

locales/en.json

@@ -35,6 +35,10 @@
     "mysql_db_creation_failed" : "MySQL database creation failed",
     "mysql_db_init_failed" : "MySQL database init failed",
     "mysql_db_initialized" : "MySQL database successfully initialized",
+    "mysql_db_drop_failed" : "MySQL drop database failed",
+    "mysql_db_dropped" : "MySQL drop database successfully",
+    "mysql_dbuser_drop_failed" : "MySQL drop user failed",
+    "mysql_dbuser_dropped" : "MySQL drop user successfully",
     "extracting" : "Extracting...",
     "downloading" : "Downloading...",
     "executing_script": "Executing script...",