unity FTBFS in artful, test failures

[Jeremy Bícha]

unity FTBFS in artful. This appears to have been triggered by libunity being rebuilt. Since immediately before that happened, unity built successfully:

https://launchpadlibrarian.net/322636956/buildlog_ubuntu-artful-amd64.unity_7.5.0+17.10.20170425.2-0ubuntu1_BUILDING.txt.gz

But afterwards, unity's tests are failing.

https://launchpadlibrarian.net/322633686/buildlog_ubuntu-artful-amd64.unity_7.5.0+17.10.20170425.1-0ubuntu1~ubuntu17.10.1_BUILDING.txt.gz

I also tried rebuilding libunity in a PPA for zesty since it had been a while since we've rebuilt libunity. But unity/zesty was able to build successfully against a rebuilt libunity/zesty.

gdk-pixbuf is the same version in zesty and artful currently.

Unity is built with -Wall -Werror -Wno-error=deprecated-declarations but it's just tests that are failing so that doesn't seem important.

Select Errors
-------------
ERROR 2017-06-05 18:46:43 unity.glib-gio <unknown>:0 g_app_info_supports_uris: assertion 'G_IS_APP_INFO (appinfo)' failed

ERROR 2017-06-05 18:46:43 unity.dash.style DashStyle.cpp:308 Impossible to find a dash-widgets.json in theme paths
ERROR 2017-06-05 18:46:43 unity.gdkpixbuf <unknown>:0 gdk_pixbuf_new_from_file_at_scale: assertion 'width > 0 || width == -1' failed
ERROR 2017-06-05 18:46:43 unity.glib-gobject <unknown>:0 g_object_unref: assertion 'G_IS_OBJECT (object)' failed

** (gdk-pixbuf-thumbnailer:22066): WARNING **: Couldn't save the thumbnail '/home/buildd/.local/share/previews/6081422487475872612.png' for file 'file:///<<BUILDDIR>>/unity-7.5.0+17.10.20170425.1/resources/switcher_background.png': Failed to open '/home/buildd/.local/share/previews/6081422487475872612.png' for writing: No such file or directory

Impact
------
This is holding up some artful work.

The immediate reason I wanted to rebuild Unity was to drop its recommends on unity-scope-gdrive which is being removed (LP: #1695928)

Also, I think it makes sense for Unity to ship its own gnome-session data now (LP: #1696255)

[Sebastien Bacher (seb128)]

Andrea said he is going to have a look, thanks!

[Jeremy Bícha (jbicha)]

https://launchpad.net/ubuntu/+source/unity/7.5.0+17.10.20170609-0ubuntu1