$ git clone -n https://src.fedoraproject.org/rpms/gtk2hs-buildtools.git /var/lib/mock/f41-build-side-1-2641586-26721/root/chroot_tmpdir/scmroot/gtk2hs-buildtools
Cloning into '/var/lib/mock/f41-build-side-1-2641586-26721/root/chroot_tmpdir/scmroot/gtk2hs-buildtools'...
$ git fetch origin e690db24f045535fec18bd0e0e37cbc941ba5006:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gtk2hs-buildtools
 * [new ref]         e690db24f045535fec18bd0e0e37cbc941ba5006 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e690db2 https://hackage.haskell.org/package/gtk2hs-buildtools-0.13.11.0/changelog