homescreen: Bail out if no screens are found

It might happen the system doesn't have any outputs connected, or there
are literally no outputs present in the system. Instead of crashing and
systemd trying always to start it up just make sure we handle that and
print out a message about what is going it.

Bug-AGL: SPEC-4459
Signed-off-by: Marius Vlad <marius.vlad@collabora.com>
Change-Id: Ia3dfab66e69ea36b2cf50fc0f6c1fd188a87e240

diff --git a/homescreen/src/main.cpp b/homescreen/src/main.cpp
index 74ec4f4..e9a5817 100644 (file)
--- a/homescreen/src/main.cpp
+++ b/homescreen/src/main.cpp
@@ -221,6 +221,11 @@ load_agl_shell_app(QPlatformNativeInterface *native,
        else
                screen = find_screen(screen_name);
 
+       if (!screen) {
+               qDebug() << "No outputs present in the system.";
+               return;
+       }
+
        qDebug() << "found primary screen " << qApp->primaryScreen()->name() <<
                "first screen " << qApp->screens().first()->name();
        output = getWlOutput(native, screen);