$ git clone -n https://src.fedoraproject.org/rpms/rubygem-pg.git /var/lib/mock/f40-build-2323176-58699/root/chroot_tmpdir/scmroot/rubygem-pg
Cloning into '/var/lib/mock/f40-build-2323176-58699/root/chroot_tmpdir/scmroot/rubygem-pg'...
$ git fetch origin 4aa870f7c87b471e4dcbe05f1773bde248e054f3:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rubygem-pg
 * [new ref]         4aa870f7c87b471e4dcbe05f1773bde248e054f3 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4aa870f Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild