$ git clone -n https://src.fedoraproject.org/rpms/yyjson.git /var/lib/mock/f45-build-39262-733/root/chroot_tmpdir/scmroot/yyjson
Cloning into '/var/lib/mock/f45-build-39262-733/root/chroot_tmpdir/scmroot/yyjson'...
$ git fetch origin b31c6e3c19e0f7f9bb95094c3eb2621470a84434:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/yyjson
 * [new ref]         b31c6e3c19e0f7f9bb95094c3eb2621470a84434 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b31c6e3 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild