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Fetcher improvements #59858

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Fetcher improvements #59858

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lheckemann
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Motivation for this change

More clarity in store path names, more abstraction

Things done
  • Tested using sandboxing (nix.useSandbox on NixOS, or option sandbox in nix.conf on non-NixOS)
  • 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 nix-review --run "nix-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)
  • Assured whether relevant documentation is up to date
  • Fits CONTRIBUTING.md.

@lheckemann
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Eval failure exists on staging as well.

grahamc
grahamc reviewed Apr 18, 2019
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Note that the sources are named "source" on purpose, see:

and I think @domenkozar did a talk on why this was a good change. We should talk a bit on if it is a good idea to go back to the previous way. cc @edolstra

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grahamc commented Apr 18, 2019 •
edited

One of the points raised in favor of this is the idea that the name parameter would make it harder to update the name of a package, but not the source's hash. Unfortunately, that doesn't actually work. The name of the package doesn't have any bearing on the sha256:

let
  pkgs = import <nixpkgs> {};

  srcWithName = name: pkgs.fetchgit {
    inherit name;
    url = "https://github.com/grahamc/ish.git";
    rev = "7edd7665edf8e33e6847d891d2ff519b492b32dc";
    sha256 = "0qjp8f82a09spz8z2idqj3w1lclr19p37877a8jscvss5a14bbda";
  };

in pkgs.writeText "example" ''
    ${srcWithName "hi"}
    ${srcWithName "there"}
    ${srcWithName "the"}
    ${srcWithName "hash"}
    ${srcWithName "is"}
    ${srcWithName "unchanged"}
  ''

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grahamc commented Apr 19, 2019

@GrahamcOfBorg eval

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grahamc commented Apr 19, 2019

Note the eval error on staging was fixed, and the error now is due to changes in this PR.

@edolstra
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Indeed the use of source is by design. We definitely don't want to go back to the situation where every fetcher (and Hydra) produced incompatible store paths.

@lheckemann lheckemann closed this Feb 9, 2020
@lheckemann lheckemann mentioned this pull request Mar 23, 2024
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