$ git clone -n https://src.fedoraproject.org/rpms/ghc-tf-random.git /var/lib/mock/f41-build-838860-159865/root/chroot_tmpdir/scmroot/ghc-tf-random
Cloning into '/var/lib/mock/f41-build-838860-159865/root/chroot_tmpdir/scmroot/ghc-tf-random'...
$ git fetch origin 11dc9275660e2be33e6c5e698addb0cb90558f88:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-tf-random
 * [new ref]         11dc9275660e2be33e6c5e698addb0cb90558f88 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 11dc927 bump release