$ git clone -n https://src.fedoraproject.org/rpms/ghc-mmap.git /var/lib/mock/f41-build-837750-159384/root/chroot_tmpdir/scmroot/ghc-mmap
Cloning into '/var/lib/mock/f41-build-837750-159384/root/chroot_tmpdir/scmroot/ghc-mmap'...
$ git fetch origin 0af80d5edbd94a892fe567a6cae6cf088185d55c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-mmap
 * [new ref]         0af80d5edbd94a892fe567a6cae6cf088185d55c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 0af80d5 bump release