$ git clone -n https://src.fedoraproject.org/rpms/ghc-numbers.git /var/lib/mock/f41-build-837760-159384/root/chroot_tmpdir/scmroot/ghc-numbers
Cloning into '/var/lib/mock/f41-build-837760-159384/root/chroot_tmpdir/scmroot/ghc-numbers'...
$ git fetch origin 553d5603f79fff446af45526bb72ee81ce8c68d8:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-numbers
 * [new ref]         553d5603f79fff446af45526bb72ee81ce8c68d8 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 553d560 bump release