$ git clone -n https://src.fedoraproject.org/rpms/gap-pkg-json.git /var/lib/mock/f40-build-2278937-55297/root/chroot_tmpdir/scmroot/gap-pkg-json
Cloning into '/var/lib/mock/f40-build-2278937-55297/root/chroot_tmpdir/scmroot/gap-pkg-json'...
$ git fetch origin 4089be2035091973aa67fdc870139e6814b5dae3:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gap-pkg-json
 * [new ref]         4089be2035091973aa67fdc870139e6814b5dae3 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4089be2 Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild