$ git clone -n https://src.fedoraproject.org/rpms/fedpkg.git /var/lib/mock/f39-build-1668939-40836/root/chroot_tmpdir/scmroot/fedpkg
Cloning into '/var/lib/mock/f39-build-1668939-40836/root/chroot_tmpdir/scmroot/fedpkg'...
$ git fetch origin ada77a47b80c0ad78d33826e6653b54c63253b1d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/fedpkg
 * [new ref]         ada77a47b80c0ad78d33826e6653b54c63253b1d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ada77a4 Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild