$ git clone -n https://src.fedoraproject.org/rpms/ghc-generic-deriving.git /var/lib/mock/f38-build-side-42-init-devel-1037719-29747/root/chroot_tmpdir/scmroot/ghc-generic-deriving
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-1037719-29747/root/chroot_tmpdir/scmroot/ghc-generic-deriving'...
$ git fetch origin 9f076daaa546bf8bad62a3a62a8dea65bd785c44:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-generic-deriving
 * [new ref]         9f076daaa546bf8bad62a3a62a8dea65bd785c44 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 9f076da Convert to %autorelease and %autochangelog