$ git clone -n https://src.fedoraproject.org/rpms/ocaml-gsl.git /var/lib/mock/f42-build-865514-173241/root/chroot_tmpdir/scmroot/ocaml-gsl
Cloning into '/var/lib/mock/f42-build-865514-173241/root/chroot_tmpdir/scmroot/ocaml-gsl'...
$ git fetch origin 65a37f4f3df9ae1105cc9ac92299ba0c2ddb42bc:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ocaml-gsl
 * [new ref]         65a37f4f3df9ae1105cc9ac92299ba0c2ddb42bc -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 65a37f4 OCaml 5.3.0 rebuild for Fedora 42