$ git clone -n https://src.fedoraproject.org/rpms/ghc-digest.git /var/lib/mock/f38-build-side-42-init-devel-963155-28792/root/chroot_tmpdir/scmroot/ghc-digest
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-963155-28792/root/chroot_tmpdir/scmroot/ghc-digest'...
$ git fetch origin 20257d20180c1c6540b28e95edbe735b1baa22d1:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-digest
 * [new ref]         20257d20180c1c6540b28e95edbe735b1baa22d1 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 20257d2 Convert to %autorelease and %autochangelog