$ git clone -n https://src.fedoraproject.org/rpms/ghc-retry.git /var/lib/mock/f38-build-side-42-init-devel-866794-28439/root/chroot_tmpdir/scmroot/ghc-retry
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-866794-28439/root/chroot_tmpdir/scmroot/ghc-retry'...
$ git fetch origin f3a3306d9873fd22dc1cae0a3988fa7aa6b818f0:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-retry
 * [new ref]         f3a3306d9873fd22dc1cae0a3988fa7aa6b818f0 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f3a3306 Convert to %autorelease and %autochangelog