$ git clone -n https://src.fedoraproject.org/rpms/pg_repack.git /var/lib/mock/f39-build-1463712-33453/root/chroot_tmpdir/scmroot/pg_repack
Cloning into '/var/lib/mock/f39-build-1463712-33453/root/chroot_tmpdir/scmroot/pg_repack'...
$ git fetch origin bb4fdfa97864f3bce914d0dd8d1c6a465747243c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/pg_repack
 * [new ref]         bb4fdfa97864f3bce914d0dd8d1c6a465747243c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at bb4fdfa Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild