"Thompson, David" <dthomps...@worcester.edu> skribis: > On Thu, Oct 29, 2015 at 6:08 AM, Jan Synáček <jan.syna...@gmail.com> wrote: >> Hello, >> >> I've been playing with guix a bit and I must say I really like it. I don't >> understand a few things though. >> >> 1) How do I tell if a package I have installed had been built locally or >> downloaded as a substitute? > > You don't.
There’s a trick that ‘guix challenge’ uses to determine whether something was locally built or substituted: run ‘guix build --log-file whatever’ and see whether that returns a local build log or not. This is a fairly reliable way to get that information. There can be false-negatives if you remove logs. There cannot be false positives, AFAICS, since even ‘guix archive --import’ of something already present does not actually overwrite it. It cannot tell the difference between really locally-built and offloaded builds, though. Ludo’.
