$ git clone -n https://src.fedoraproject.org/rpms/rubygem-gtk3.git /var/lib/mock/f41-build-855350-167108/root/chroot_tmpdir/scmroot/rubygem-gtk3
Cloning into '/var/lib/mock/f41-build-855350-167108/root/chroot_tmpdir/scmroot/rubygem-gtk3'...
$ git fetch origin 68f412aefa2b506a6b85eb0b4e090cc794a6f337:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rubygem-gtk3
 * [new ref]         68f412aefa2b506a6b85eb0b4e090cc794a6f337 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 68f412a skip failing test for now