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Allow passing attributes via files instead of environment variables

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Closes #473.
This commit is contained in:
Eelco Dolstra 2015-02-17 14:42:15 +01:00
parent 29e1ff675b
commit a70d275f3d
4 changed files with 55 additions and 5 deletions
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20
src/libstore/build.cc
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@ -1646,14 +1646,26 @@ void DerivationGoal::startBuilder()
/* The maximum number of cores to utilize for parallel building. */
env["NIX_BUILD_CORES"] = (format("%d") % settings.buildCores).str();
/* Add all bindings specified in the derivation. */
foreach (StringPairs::iterator, i, drv.env)
env[i->first] = i->second;
/* Create a temporary directory where the build will take
place. */
tmpDir = createTempDir("", "nix-build-" + storePathToName(drvPath), false, false, 0700);
/* Add all bindings specified in the derivation via the
environments, except those listed in the passAsFile
attribute. Those are passed as file names pointing to
temporary files containing the contents. */
StringSet passAsFile = tokenizeString<StringSet>(get(drv.env, "passAsFile"));
int fileNr = 0;
for (auto & i : drv.env) {
if (passAsFile.find(i.first) == passAsFile.end()) {
env[i.first] = i.second;
} else {
Path p = tmpDir + "/.attr-" + int2String(fileNr++);
writeFile(p, i.second);
env[i.first] = p;
}
}
/* For convenience, set an environment pointing to the top build
directory. */
env["NIX_BUILD_TOP"] = tmpDir;