$ git clone -n https://src.fedoraproject.org/rpms/libpqxx.git /var/lib/mock/f40-build-796468-140694/root/chroot_tmpdir/scmroot/libpqxx
Cloning into '/var/lib/mock/f40-build-796468-140694/root/chroot_tmpdir/scmroot/libpqxx'...
$ git fetch origin 43316048875949ef6424eb4499eb8ec0f4780a39:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libpqxx
 * [new ref]         43316048875949ef6424eb4499eb8ec0f4780a39 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4331604 Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild