$ git clone -n https://src.fedoraproject.org/rpms/jsmn.git /var/lib/mock/f45-build-14524-461/root/chroot_tmpdir/scmroot/jsmn
Cloning into '/var/lib/mock/f45-build-14524-461/root/chroot_tmpdir/scmroot/jsmn'...
$ git fetch origin 80735d781d43546f46edcf2b11d287b8d538822c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/jsmn
 * [new ref]         80735d781d43546f46edcf2b11d287b8d538822c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 80735d7 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild