$ git clone -n https://src.fedoraproject.org/rpms/R-cliapp.git /var/lib/mock/f40-build-1930452-25111/root/chroot_tmpdir/scmroot/R-cliapp
Cloning into '/var/lib/mock/f40-build-1930452-25111/root/chroot_tmpdir/scmroot/R-cliapp'...
$ git fetch origin 0daf7717d8352583e8e2cf76a49227e3ee979052:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-cliapp
 * [new ref]         0daf7717d8352583e8e2cf76a49227e3ee979052 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 0daf771 R-maint-sig mass rebuild