$ git clone -n https://src.fedoraproject.org/rpms/pbuilder.git /var/lib/mock/f40-build-2301038-56759/root/chroot_tmpdir/scmroot/pbuilder
Cloning into '/var/lib/mock/f40-build-2301038-56759/root/chroot_tmpdir/scmroot/pbuilder'...
$ git fetch origin a31d39a76b5382797285a57b5d8a0c1e0dd85a7e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/pbuilder
 * [new ref]         a31d39a76b5382797285a57b5d8a0c1e0dd85a7e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a31d39a Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild