$ git clone -n https://src.fedoraproject.org/rpms/gtk+.git /var/lib/mock/f40-build-2236753-53519/root/chroot_tmpdir/scmroot/gtk+
Cloning into '/var/lib/mock/f40-build-2236753-53519/root/chroot_tmpdir/scmroot/gtk+'...
$ git fetch origin d3c5f6d387f443fc96540bc4f8a349017fb06487:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gtk+
 * [new ref]         d3c5f6d387f443fc96540bc4f8a349017fb06487 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d3c5f6d Fix incompatible pointer type in call to XmbTextListToTextProperty