$ git clone -n https://src.fedoraproject.org/rpms/ghc-mmorph.git /var/lib/mock/f41-build-838104-159539/root/chroot_tmpdir/scmroot/ghc-mmorph
Cloning into '/var/lib/mock/f41-build-838104-159539/root/chroot_tmpdir/scmroot/ghc-mmorph'...
$ git fetch origin e6401ac4a64a7025f2989e5cb5e3fc44ce05da3b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-mmorph
 * [new ref]         e6401ac4a64a7025f2989e5cb5e3fc44ce05da3b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e6401ac bump release