$ git clone -n https://src.fedoraproject.org/rpms/objfw.git /var/lib/mock/f39-build-1837919-41941/root/chroot_tmpdir/scmroot/objfw
Cloning into '/var/lib/mock/f39-build-1837919-41941/root/chroot_tmpdir/scmroot/objfw'...
$ git fetch origin 74ddf6d10579613a74b9fe7acb52189fa9b8cf98:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/objfw
 * [new ref]         74ddf6d10579613a74b9fe7acb52189fa9b8cf98 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 74ddf6d Update to 1.0.5