$ git clone -n https://src.fedoraproject.org/rpms/git-up.git /var/lib/mock/f39-build-1686767-41102/root/chroot_tmpdir/scmroot/git-up
Cloning into '/var/lib/mock/f39-build-1686767-41102/root/chroot_tmpdir/scmroot/git-up'...
$ git fetch origin 08cff291372cf0d27ea4813c29045aee9ad6c7ef:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/git-up
 * [new ref]         08cff291372cf0d27ea4813c29045aee9ad6c7ef -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 08cff29 Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild