$ git clone -n https://src.fedoraproject.org/rpms/xen.git /var/lib/mock/f42-build-866033-173661/root/chroot_tmpdir/scmroot/xen
Cloning into '/var/lib/mock/f42-build-866033-173661/root/chroot_tmpdir/scmroot/xen'...
$ git fetch origin 5c740ce63a9ca0526725f40283d0091ce327ae19:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/xen
 * [new ref]         5c740ce63a9ca0526725f40283d0091ce327ae19 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5c740ce OCaml 5.3.0 rebuild for Fedora 42