$ git clone -n https://src.fedoraproject.org/rpms/ghc8.8.git /var/lib/mock/f38-build-side-42-init-devel-826633-28364/root/chroot_tmpdir/scmroot/ghc8.8
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-826633-28364/root/chroot_tmpdir/scmroot/ghc8.8'...
$ git fetch origin a778f3397574a0429d07345250161de355c9b5fb:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc8.8
 * [new ref]         a778f3397574a0429d07345250161de355c9b5fb -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a778f33 Added the README