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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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31
src/libstore/globals.cc
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@ -341,10 +341,15 @@ PathsInChroot BaseSetting<PathsInChroot>::parse(const std::string & str) const
i.pop_back();
}
size_t p = i.find('=');
if (p == std::string::npos)
pathsInChroot[i] = {.source = i, .optional = optional};
else
pathsInChroot[i.substr(0, p)] = {.source = i.substr(p + 1), .optional = optional};
std::string inside, outside;
if (p == std::string::npos) {
inside = i;
outside = i;
} else {
inside = i.substr(0, p);
outside = i.substr(p + 1);
}
pathsInChroot[inside] = {.source = outside, .optional = optional};
}
return pathsInChroot;
}
@ -374,6 +379,24 @@ unsigned int MaxBuildJobsSetting::parse(const std::string & str) const
}
}
NLOHMANN_DEFINE_TYPE_NON_INTRUSIVE(Settings::ExternalBuilder, systems, program, args);
template<>
Settings::ExternalBuilders BaseSetting<Settings::ExternalBuilders>::parse(const std::string & str) const
{
try {
return nlohmann::json::parse(str).template get<Settings::ExternalBuilders>();
} catch (std::exception & e) {
throw UsageError("parsing setting '%s': %s", name, e.what());
}
}
template<>
std::string BaseSetting<Settings::ExternalBuilders>::to_string() const
{
return nlohmann::json(value).dump();
}
template<>
void BaseSetting<PathsInChroot>::appendOrSet(PathsInChroot newValue, bool append)
{