$ git clone -n https://src.fedoraproject.org/rpms/clang13.git /var/lib/mock/f42-bootstrap-3462117-45558/root/chroot_tmpdir/scmroot/clang13
Cloning into '/var/lib/mock/f42-bootstrap-3462117-45558/root/chroot_tmpdir/scmroot/clang13'...
$ git fetch origin 2db8a8e4961bac118f4248439dc253de898f06d9:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/clang13
 * [new ref]         2db8a8e4961bac118f4248439dc253de898f06d9 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 2db8a8e Rebuilt for https://fedoraproject.org/wiki/Fedora_42_Mass_Rebuild