bug#28310: guix build -n misses package builds

[Andreas Enge]

Hello,

On Sat, Sep 02, 2017 at 01:08:12AM +0200, Ludovic Courtès wrote:
> “-n” now implies “--no-grafts” (commit
> fd59105c49965db956fac73c68d8b00d068f5d5c).  This was motivated by the
> need to have -n really perform a dry run.

if I understand your answer correctly, then no output with "-n" means that
the ungrafted packages are already available in my store.

> The downside is that with -n we now see only half of the build plan, and
> when we remove -n, we start with the other half of the build plan,
> grafting.

Then this other half would just be grafting, which would not require to
download source and build packages locally.

Or are the built packages the replacements for packages with security
updates, that are grafted upon the existing packages?

Andreas