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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
, getopt
, modDirVersion ? ""
, forPlatform ? stdenv.buildPlatform
}:
substituteAll {
@ -17,8 +18,8 @@ substituteAll {
inherit coreutils getopt;
uSystem = if stdenv.buildPlatform.uname.system != null then stdenv.buildPlatform.uname.system else "unknown";
inherit (stdenv.buildPlatform.uname) processor;
uSystem = if forPlatform.uname.system != null then forPlatform.uname.system else "unknown";
inherit (forPlatform.uname) processor;
# uname -o
# 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://github.com/coreutils/gnulib/blob/master/m4/host-os.m4
operatingSystem =
if stdenv.buildPlatform.isLinux
if forPlatform.isLinux
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?
else "unknown";
@ -42,11 +43,12 @@ substituteAll {
mainProgram = "uname";
longDescription = ''
This package provides a replacement for `uname` whose output depends only
on `stdenv.buildPlatform`. It is meant to be used from within derivations.
Many packages' build processes run `uname` at compile time and embed its
output into the result of the build. Since `uname` calls into the kernel,
and the Nix sandbox currently does not intercept these calls, builds made
on different kernels will produce different results.
on `stdenv.buildPlatform`, or a configurable `forPlatform`. It is meant
to be used from within derivations. Many packages' build processes run
`uname` at compile time and embed its output into the result of the build.
Since `uname` calls into the kernel, and the Nix sandbox currently does
not intercept these calls, builds made on different kernels will produce
different results.
'';
license = [ licenses.mit ];
maintainers = with maintainers; [ artturin ];