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deterministic-uname: Overridable platform

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Some packages rely on `uname` to configure the host target which breaks cross-compilation.
We can have more control over the evaluation of `uname` by placing `deterministic-uname` into the package's `nativeBuildInputs`.
However the current `deterministic-uname` is hardcoded to `buildPlatform`.

This PR introduces a build argument `forPlatform` to `deterministic-uname` which allows you to override the platform it reports.

Example:
```nix
deterministic-uname.override { forPlatform = stdenv.hostPlatform; }
```
This commit is contained in:
Simon Žlender 2024-05-09 19:11:20 +02:00 committed by Artturin
parent baa26b9fb9
commit 2ed51a3ff0
1 changed files with 11 additions and 9 deletions
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20
pkgs/build-support/deterministic-uname/default.nix
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@ -5,6 +5,7 @@
, coreutils , coreutils
, getopt , getopt
, modDirVersion ? "" , modDirVersion ? ""
, forPlatform ? stdenv.buildPlatform
}: }:
substituteAll { substituteAll {
@ -17,8 +18,8 @@ substituteAll {
inherit coreutils getopt; inherit coreutils getopt;
uSystem = if stdenv.buildPlatform.uname.system != null then stdenv.buildPlatform.uname.system else "unknown"; uSystem = if forPlatform.uname.system != null then forPlatform.uname.system else "unknown";
inherit (stdenv.buildPlatform.uname) processor; inherit (forPlatform.uname) processor;
# uname -o # uname -o
# maybe add to lib/systems/default.nix uname attrset # maybe add to lib/systems/default.nix uname attrset
@ -26,9 +27,9 @@ substituteAll {
# https://stackoverflow.com/questions/61711186/where-does-host-operating-system-in-uname-c-comes-from # https://stackoverflow.com/questions/61711186/where-does-host-operating-system-in-uname-c-comes-from
# https://github.com/coreutils/gnulib/blob/master/m4/host-os.m4 # https://github.com/coreutils/gnulib/blob/master/m4/host-os.m4
operatingSystem = operatingSystem =
if stdenv.buildPlatform.isLinux if forPlatform.isLinux
then "GNU/Linux" then "GNU/Linux"
else if stdenv.buildPlatform.isDarwin else if forPlatform.isDarwin
then "Darwin" # darwin isn't in host-os.m4 so where does this come from? then "Darwin" # darwin isn't in host-os.m4 so where does this come from?
else "unknown"; else "unknown";
@ -42,11 +43,12 @@ substituteAll {
mainProgram = "uname"; mainProgram = "uname";
longDescription = '' longDescription = ''
This package provides a replacement for `uname` whose output depends only This package provides a replacement for `uname` whose output depends only
on `stdenv.buildPlatform`. It is meant to be used from within derivations. on `stdenv.buildPlatform`, or a configurable `forPlatform`. It is meant
Many packages' build processes run `uname` at compile time and embed its to be used from within derivations. Many packages' build processes run
output into the result of the build. Since `uname` calls into the kernel, `uname` at compile time and embed its output into the result of the build.
and the Nix sandbox currently does not intercept these calls, builds made Since `uname` calls into the kernel, and the Nix sandbox currently does
on different kernels will produce different results. not intercept these calls, builds made on different kernels will produce
different results.
''; '';
license = [ licenses.mit ]; license = [ licenses.mit ];
maintainers = with maintainers; [ artturin ]; maintainers = with maintainers; [ artturin ];