$ git clone -n https://src.fedoraproject.org/rpms/xmlstreambuffer.git /var/lib/mock/f40-build-2403200-60556/root/chroot_tmpdir/scmroot/xmlstreambuffer
Cloning into '/var/lib/mock/f40-build-2403200-60556/root/chroot_tmpdir/scmroot/xmlstreambuffer'...
$ git fetch origin 378e84119a45a3c0b7c943ae32729599a61b4370:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/xmlstreambuffer
 * [new ref]         378e84119a45a3c0b7c943ae32729599a61b4370 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 378e841 Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild