backup: fix full backup restore postinstall calls that now need first username+fullname+password

src/backup.py

@@ -32,6 +32,7 @@ from functools import reduce
 from packaging import version
 
 from moulinette import Moulinette, m18n
+from moulinette.utils.text import random_ascii
 from moulinette.utils.log import getActionLogger
 from moulinette.utils.filesystem import (
     read_file,
@@ -936,7 +937,10 @@ class RestoreManager:
                 )
 
             logger.debug("executing the post-install...")
-            tools_postinstall(domain, "Yunohost", True)
+
+            # Use a dummy password which is not gonna be saved anywhere
+            # because the next thing to happen should be that a full restore of the LDAP db will happen
+            tools_postinstall(domain, "admin", "Admin", password=random_ascii(70), ignore_dyndns=True, overwrite_root_password=False)
 
     def clean(self):
         """

src/tools.py

@@ -152,6 +152,7 @@ def tools_postinstall(
     password,
     ignore_dyndns=False,
     force_diskspace=False,
+    overwrite_root_password=True,
 ):
     from yunohost.dyndns import _dyndns_available
     from yunohost.utils.dns import is_yunohost_dyndns_domain
@@ -225,10 +226,11 @@ def tools_postinstall(
     domain_add(domain, dyndns)
     domain_main_domain(domain)
 
+    # First user
     user_create(username, domain, password, admin=True, fullname=fullname)
 
-    # Update LDAP admin and create home dir
-    tools_rootpw(password)
+    if overwrite_root_password:
+        tools_rootpw(password)
 
     # Enable UPnP silently and reload firewall
     firewall_upnp("enable", no_refresh=True)