$ git clone -n https://src.fedoraproject.org/rpms/perl-Data-JavaScript.git /var/lib/mock/f40-build-2016406-46189/root/chroot_tmpdir/scmroot/perl-Data-JavaScript
Cloning into '/var/lib/mock/f40-build-2016406-46189/root/chroot_tmpdir/scmroot/perl-Data-JavaScript'...
$ git fetch origin c29fb8c30271f08e7f68671a2d32dd163dcf1452:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Data-JavaScript
 * [new ref]         c29fb8c30271f08e7f68671a2d32dd163dcf1452 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c29fb8c Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild