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Add external builders

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These are helper programs that execute derivations for specified
system types (e.g. using QEMU to emulate another system type).

To use, set `external-builders`:

  external-builders = [{"systems": ["aarch64-linux"], "program": "/path/to/external-builder.py"}]

The external builder gets one command line argument, the path to a JSON file containing all necessary information about the derivation:

  {
    "args": [...],
    "builder": "/nix/store/kwcyvgdg98n98hqapaz8sw92pc2s78x6-bash-5.2p37/bin/bash",
    "env": {
      "HOME": "/homeless-shelter",
      ...
    },
    "realStoreDir": "/tmp/nix/nix/store",
    "storeDir": "/nix/store",
    "tmpDir": "/tmp/nix-shell.dzQ2hE/nix-build-patchelf-0.14.3.drv-46/build",
    "tmpDirInSandbox": "/build"
  }

Co-authored-by: Cole Helbling <cole.helbling@determinate.systems>
This commit is contained in:
Eelco Dolstra 2025-10-03 14:34:13 +02:00
parent 76ac3758d7
commit 584ef0ffd3
6 changed files with 274 additions and 18 deletions
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8
src/libutil/experimental-features.cc
View file

@ -304,6 +304,14 @@ constexpr std::array<ExperimentalFeatureDetails, numXpFeatures> xpFeatureDetails
)",
.trackingUrl = "https://github.com/NixOS/nix/milestone/55",
},
{
.tag = Xp::ExternalBuilders,
.name = "external-builders",
.description = R"(
Enables support for external builders / sandbox providers.
)",
.trackingUrl = "",
},
{
.tag = Xp::BLAKE3Hashes,
.name = "blake3-hashes",