[users] Improve explanation of other steps of adding a user

src/modules/users/CreateUserJob.cpp

@@ -161,29 +161,23 @@ CreateUserJob::exec()
         return pres.explainProcess( useradd, 10 /* bogus timeout */ );
     }
 
-    int ec = CalamaresUtils::System::instance()->
-             targetEnvCall( { "usermod",
-                              "-aG",
-                              defaultGroups,
-                              m_userName } );
-    if ( ec )
-        return Calamares::JobResult::error( tr( "Cannot add user %1 to groups: %2." )
-                                                .arg( m_userName )
-                                                .arg( defaultGroups ),
-                                            tr( "usermod terminated with error code %1." )
-                                                .arg( ec ) );
-
-    ec = CalamaresUtils::System::instance()->
-                      targetEnvCall( { "chown",
-                                       "-R",
-                                       QString( "%1:%2" ).arg( m_userName )
-                                                         .arg( m_userName ),
-                                       QString( "/home/%1" ).arg( m_userName ) } );
-    if ( ec )
-        return Calamares::JobResult::error( tr( "Cannot set home directory ownership for user %1." )
-                                                .arg( m_userName ),
-                                            tr( "chown terminated with error code %1." )
-                                                .arg( ec ) );
+    pres = CalamaresUtils::System::instance()->targetEnvCommand(
+        { "usermod", "-aG", defaultGroups, m_userName } );
+    if ( pres.getExitCode() )
+    {
+        cError() << "usermod failed" << pres.getExitCode();
+        return pres.explainProcess( "usermod", 10 );
+    }
+
+    QString userGroup = QString( "%1:%2" ).arg( m_userName ).arg( m_userName );
+    QString homeDir = QString( "/home/%1" ).arg( m_userName );
+    pres = CalamaresUtils::System::instance()->targetEnvCommand(
+        { "chown", "-R", userGroup, homeDir } );
+    if ( pres.getExitCode() )
+    {
+        cError() << "chown failed" << pres.getExitCode();
+        return pres.explainProcess( "chown", 10 );
+    }
 
     return Calamares::JobResult::ok();
 }