$ git clone -n https://src.fedoraproject.org/rpms/llvm15.git /var/lib/mock/f40-build-1572406-24016/root/chroot_tmpdir/scmroot/llvm15
Cloning into '/var/lib/mock/f40-build-1572406-24016/root/chroot_tmpdir/scmroot/llvm15'...
$ git fetch origin d071f676518e9fbc88a1ffd5611e0669d800d36c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/llvm15
 * [new ref]         d071f676518e9fbc88a1ffd5611e0669d800d36c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d071f67 Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild