$ git clone -n https://src.fedoraproject.org/rpms/ghc-gi-gtk.git /var/lib/mock/f41-build-1020912-18021/root/chroot_tmpdir/scmroot/ghc-gi-gtk
Cloning into '/var/lib/mock/f41-build-1020912-18021/root/chroot_tmpdir/scmroot/ghc-gi-gtk'...
$ git fetch origin 09d65cce75c0d14bfd73f00333b25168ca01a3a9:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-gi-gtk
 * [new ref]         09d65cce75c0d14bfd73f00333b25168ca01a3a9 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 09d65cc cabal-rpm-2.1.5