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wafHook: use python3 #104701

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raboof
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@raboof raboof commented Nov 23, 2020

Rather than 'python' which will be stuck on python2 for a while for
compatibility reasons.

Motivation for this change
Things done
  • Tested using sandboxing (nix.useSandbox on NixOS, or option sandbox in nix.conf on non-NixOS linux)
  • Built on platform(s)
    • NixOS
    • macOS
    • other Linux distributions
  • Tested via one or more NixOS test(s) if existing and applicable for the change (look inside nixos/tests)
  • Tested compilation of all pkgs that depend on this change using nix-shell -p nixpkgs-review --run "nixpkgs-review wip"
  • Tested execution of all binary files (usually in ./result/bin/)
  • Determined the impact on package closure size (by running nix path-info -S before and after)
  • Ensured that relevant documentation is up to date
  • Fits CONTRIBUTING.md.

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@veprbl
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veprbl commented Nov 23, 2020

Also see relevant discussion in #69310

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raboof commented Nov 23, 2020

Also see relevant discussion in #69310

Thanks, not sure how I missed that. While I think the direction that is going into sounds great, I also don't feel qualified to move that one forward. Perhaps 'just' the update to python3 would already be a useful (though less ambitious) change?

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veprbl commented Nov 23, 2020

Perhaps 'just' the update to python3 would already be a useful (though less ambitious) change?

What is it meant to achieve? You should already be able to add (wafHook.override { python = python3; }) in your expressions.

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raboof commented Nov 23, 2020

What is it meant to achieve

My short-term goal was to remove python2 from the talloc derivation, in order to go in the direction of removing all references to python2 from the closure of the nixos_minimal derivation, which is a (admittedly somewhat arbitrary) milestone we're working towards for https://r13y.com/

Currently one of the ways it still depends on python2 is via the use of wafHook while building talloc.

Now of course I could just override the wafHook specifically for talloc, but it seemed more healthy to make python3 the norm rather than the exception.

@raboof raboof changed the base branch from master to staging November 23, 2020 21:16
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talloc: remove python2 as a build dependency

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This makes sure waf, which is used to build talloc, is ran
with python3 rather than python2.

(another option would be to make this the default for
wafHook, see NixOS#104701)
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Rather than 'python' which will be stuck on python2 for a while for
compatibility reasons.
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FRidh commented Dec 17, 2020

Closing in favor of #106533.

@FRidh FRidh closed this Dec 17, 2020
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FRidh commented Dec 17, 2020

Now of course I could just override the wafHook specifically for talloc, but it seemed more healthy to make python3 the norm rather than the exception.

There will most likely be regressions in some packages, because the embedded waf scripts may still be python 2 only.

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6.topic: reproducible builds 10.rebuild-darwin: 101-500 10.rebuild-linux: 501+ 10.rebuild-linux: 1001-2500
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