$ git clone -n https://src.fedoraproject.org/rpms/ghc-xml-types.git /var/lib/mock/f41-build-838855-159865/root/chroot_tmpdir/scmroot/ghc-xml-types
Cloning into '/var/lib/mock/f41-build-838855-159865/root/chroot_tmpdir/scmroot/ghc-xml-types'...
$ git fetch origin 4b74e6620858f2491c7bd77cb3bd24688de6f5a7:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-xml-types
 * [new ref]         4b74e6620858f2491c7bd77cb3bd24688de6f5a7 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4b74e66 bump release