$ git clone -n https://src.fedoraproject.org/rpms/ghc-reducers.git /var/lib/mock/f38-build-side-42-init-devel-875810-28452/root/chroot_tmpdir/scmroot/ghc-reducers
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-875810-28452/root/chroot_tmpdir/scmroot/ghc-reducers'...
$ git fetch origin ef9c6cd8085cfa5c288cfa37a58591613308878c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-reducers
 * [new ref]         ef9c6cd8085cfa5c288cfa37a58591613308878c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ef9c6cd Convert to %autorelease and %autochangelog