$ git clone -n https://src.fedoraproject.org/rpms/build-constraints-rpm-macros.git /var/lib/mock/f39-build-1446508-32691/root/chroot_tmpdir/scmroot/build-constraints-rpm-macros
Cloning into '/var/lib/mock/f39-build-1446508-32691/root/chroot_tmpdir/scmroot/build-constraints-rpm-macros'...
$ git fetch origin a209c53a15fa5c0b2a6c9416cfe6f4b97963ac0c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/build-constraints-rpm-macros
 * [new ref]         a209c53a15fa5c0b2a6c9416cfe6f4b97963ac0c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a209c53 Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild