$ git clone -n https://src.fedoraproject.org/rpms/R-rlang /var/lib/mock/f39-build-1595052-38323/root/chroot_tmpdir/scmroot/R-rlang
Cloning into '/var/lib/mock/f39-build-1595052-38323/root/chroot_tmpdir/scmroot/R-rlang'...
$ git fetch origin fca2073e6e9896434021139a542eb965b51c8786:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-rlang
 * [new ref]         fca2073e6e9896434021139a542eb965b51c8786 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at fca2073 Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild