$ git clone -n https://src.fedoraproject.org/rpms/ocaml-astring.git /var/lib/mock/f40-build-739613-109130/root/chroot_tmpdir/scmroot/ocaml-astring
Cloning into '/var/lib/mock/f40-build-739613-109130/root/chroot_tmpdir/scmroot/ocaml-astring'...
$ git fetch origin 6812c8736cc0fec61f6e97f059e3f50d31312cf8:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ocaml-astring
 * [new ref]         6812c8736cc0fec61f6e97f059e3f50d31312cf8 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6812c87 Bump release and rebuild