$ git clone -n https://src.fedoraproject.org/rpms/lua-json.git /var/lib/mock/f45-build-17643-502/root/chroot_tmpdir/scmroot/lua-json
Cloning into '/var/lib/mock/f45-build-17643-502/root/chroot_tmpdir/scmroot/lua-json'...
$ git fetch origin b26b12829bcd19391095b2ead044163196967104:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/lua-json
 * [new ref]         b26b12829bcd19391095b2ead044163196967104 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b26b128 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild