$ git clone -n https://src.fedoraproject.org/rpms/newtonsoft-json.git /var/lib/mock/f42-build-3346787-45002/root/chroot_tmpdir/scmroot/newtonsoft-json
Cloning into '/var/lib/mock/f42-build-3346787-45002/root/chroot_tmpdir/scmroot/newtonsoft-json'...
$ git fetch origin 65a661829daa9c13333e4e1fd1025607faa2459f:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/newtonsoft-json
 * [new ref]         65a661829daa9c13333e4e1fd1025607faa2459f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 65a6618 Rebuilt for https://fedoraproject.org/wiki/Fedora_42_Mass_Rebuild