$ git clone -n https://src.fedoraproject.org/rpms/shaderc.git /var/lib/mock/f42-bootstrap-3462922-45593/root/chroot_tmpdir/scmroot/shaderc
Cloning into '/var/lib/mock/f42-bootstrap-3462922-45593/root/chroot_tmpdir/scmroot/shaderc'...
$ git fetch origin b5145be5a76dac44b0ab3a249bdc7c1e226cf30d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/shaderc
 * [new ref]         b5145be5a76dac44b0ab3a249bdc7c1e226cf30d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b5145be Rebuilt for https://fedoraproject.org/wiki/Fedora_42_Mass_Rebuild