$ git clone -n https://src.fedoraproject.org/rpms/nulib2.git /var/lib/mock/f40-build-761953-121810/root/chroot_tmpdir/scmroot/nulib2
Cloning into '/var/lib/mock/f40-build-761953-121810/root/chroot_tmpdir/scmroot/nulib2'...
$ git fetch origin 670f12e2c3ba57baed582f82ac8493404aee73fc:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/nulib2
 * [new ref]         670f12e2c3ba57baed582f82ac8493404aee73fc -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 670f12e Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild