$ git clone -n https://src.fedoraproject.org/rpms/R2spec.git /var/lib/mock/f40-build-2031655-47640/root/chroot_tmpdir/scmroot/R2spec
Cloning into '/var/lib/mock/f40-build-2031655-47640/root/chroot_tmpdir/scmroot/R2spec'...
$ git fetch origin 0cda13a2e0d508d202e55be60ad5154d45f9c485:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R2spec
 * [new ref]         0cda13a2e0d508d202e55be60ad5154d45f9c485 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 0cda13a Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild