$ git clone -n https://src.fedoraproject.org/rpms/ghc-primitive.git /var/lib/mock/f38-build-side-42-init-devel-745395-27658/root/chroot_tmpdir/scmroot/ghc-primitive
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-745395-27658/root/chroot_tmpdir/scmroot/ghc-primitive'...
$ git fetch origin cb28aa8c976165c9b79eaabbaed56a7966422b42:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-primitive
 * [new ref]         cb28aa8c976165c9b79eaabbaed56a7966422b42 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at cb28aa8 Convert to %autorelease and %autochangelog