$ git clone -n https://src.fedoraproject.org/rpms/ghc-file-embed.git /var/lib/mock/f39-build-2115420-50682/root/chroot_tmpdir/scmroot/ghc-file-embed
Cloning into '/var/lib/mock/f39-build-2115420-50682/root/chroot_tmpdir/scmroot/ghc-file-embed'...
$ git fetch origin be59e8a9eee0c08b79a3d9b48cc8d894bc4d9101:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-file-embed
 * [new ref]         be59e8a9eee0c08b79a3d9b48cc8d894bc4d9101 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at be59e8a bump release