$ git clone -n https://src.fedoraproject.org/rpms/R-purrr.git /var/lib/mock/f40-build-2189610-51418/root/chroot_tmpdir/scmroot/R-purrr
Cloning into '/var/lib/mock/f40-build-2189610-51418/root/chroot_tmpdir/scmroot/R-purrr'...
$ git fetch origin 517211623f7eea16f3529b95f1effb53ea783eca:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-purrr
 * [new ref]         517211623f7eea16f3529b95f1effb53ea783eca -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5172116 Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild