$ git clone -n https://src.fedoraproject.org/rpms/R-cli.git /var/lib/mock/f39-build-2072267-49342/root/chroot_tmpdir/scmroot/R-cli
Cloning into '/var/lib/mock/f39-build-2072267-49342/root/chroot_tmpdir/scmroot/R-cli'...
$ git fetch origin e8d4db576ca0597b446ec616d6e1a6caa6cd87eb:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-cli
 * [new ref]         e8d4db576ca0597b446ec616d6e1a6caa6cd87eb -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e8d4db5 Update to 3.6.1