$ git clone -n https://src.fedoraproject.org/rpms/newsx.git /var/lib/mock/f39-build-1560368-37338/root/chroot_tmpdir/scmroot/newsx
Cloning into '/var/lib/mock/f39-build-1560368-37338/root/chroot_tmpdir/scmroot/newsx'...
$ git fetch origin 2cf482b8759dc6f17ea863653e1f1411f69478a6:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/newsx
 * [new ref]         2cf482b8759dc6f17ea863653e1f1411f69478a6 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 2cf482b Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild