Return 0 on uninstall when on_master for case of not installed

This is to suppress the spurious error message:

The ipa-client-install command failed.

when the client is not configured.

This is managed by allowing a ScriptError to return SUCCESS (0)
and have this ignored in log_failure().

https://pagure.io/freeipa/issue/7836

Signed-off-by: Rob Crittenden <rcritten@redhat.com>
Reviewed-By: Florence Blanc-Renaud <flo@redhat.com>

ipaclient/install/client.py

@@ -3175,9 +3175,13 @@ def uninstall_check(options):
     fstore = sysrestore.FileStore(paths.IPA_CLIENT_SYSRESTORE)
 
     if not is_ipa_client_installed(fstore):
+        if options.on_master:
+            rval = SUCCESS
+        else:
+            rval = CLIENT_NOT_CONFIGURED
         raise ScriptError(
             "IPA client is not configured on this system.",
-            rval=CLIENT_NOT_CONFIGURED)
+            rval=rval)
 
     server_fstore = sysrestore.FileStore(paths.SYSRESTORE)
     if server_fstore.has_files() and not options.on_master:

ipapython/admintool.py

@@ -279,7 +279,7 @@ class AdminTool:
         """Given an exception, return a message (or None) and process exit code
         """
         if isinstance(exception, ScriptError):
-            return exception.msg, exception.rval or 1
+            return exception.msg, exception.rval
         elif isinstance(exception, SystemExit):
             if isinstance(exception.code, int):
                 return None, exception.code
@@ -307,6 +307,11 @@ class AdminTool:
                      self.command_name, type(exception).__name__, exception)
         if error_message:
             logger.error('%s', error_message)
+        if return_value == 0:
+            # A script may raise an exception but still want quit gracefully,
+            # like the case of ipa-client-install called from
+            # ipa-server-install.
+            return
         message = "The %s command failed." % self.command_name
         if self.log_file_name and return_value != 2:
             # magic value because this is common between server and client