$ git clone -n https://src.fedoraproject.org/rpms/libpqxx.git /var/lib/mock/f39-build-1575786-37939/root/chroot_tmpdir/scmroot/libpqxx
Cloning into '/var/lib/mock/f39-build-1575786-37939/root/chroot_tmpdir/scmroot/libpqxx'...
$ git fetch origin ee482e7dc2bcbe04ea98767dade9366f7fa257c7:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libpqxx
 * [new ref]         ee482e7dc2bcbe04ea98767dade9366f7fa257c7 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ee482e7 Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild