Allow passing attributes via files instead of environment variables
Closes #473.
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@ -242,6 +242,27 @@ stdenv.mkDerivation {
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</varlistentry>
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<varlistentry><term><varname>passAsFile</varname></term>
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<listitem><para>A list of names of attributes that should be
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passed via files rather than environment variables. For example,
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if you have
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<programlisting>
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passAsFile = ["big"];
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big = "a very long string";
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</programlisting>
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then when the builder runs, the environment variable
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<envar>big</envar> will contain the absolute path to a temporary
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file containing <literal>a very long string</literal>. This is
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useful when you need to pass large strings to a builder, since
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most operating systems impose a limit on the size of the
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environment (typically, a few hundred kilobyte).</para></listitem>
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</varlistentry>
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<varlistentry><term><varname>preferLocalBuild</varname></term>
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<listitem><para>If this attribute is set to
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@ -1646,14 +1646,26 @@ void DerivationGoal::startBuilder()
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/* The maximum number of cores to utilize for parallel building. */
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env["NIX_BUILD_CORES"] = (format("%d") % settings.buildCores).str();
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/* Add all bindings specified in the derivation. */
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foreach (StringPairs::iterator, i, drv.env)
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env[i->first] = i->second;
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/* Create a temporary directory where the build will take
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place. */
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tmpDir = createTempDir("", "nix-build-" + storePathToName(drvPath), false, false, 0700);
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/* Add all bindings specified in the derivation via the
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environments, except those listed in the passAsFile
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attribute. Those are passed as file names pointing to
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temporary files containing the contents. */
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StringSet passAsFile = tokenizeString<StringSet>(get(drv.env, "passAsFile"));
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int fileNr = 0;
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for (auto & i : drv.env) {
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if (passAsFile.find(i.first) == passAsFile.end()) {
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env[i.first] = i.second;
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} else {
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Path p = tmpDir + "/.attr-" + int2String(fileNr++);
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writeFile(p, i.second);
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env[i.first] = p;
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}
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}
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/* For convenience, set an environment pointing to the top build
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directory. */
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env["NIX_BUILD_TOP"] = tmpDir;
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@ -11,7 +11,7 @@ nix_tests = \
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binary-patching.sh timeout.sh secure-drv-outputs.sh nix-channel.sh \
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multiple-outputs.sh import-derivation.sh fetchurl.sh optimise-store.sh \
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binary-cache.sh nix-profile.sh repair.sh dump-db.sh case-hack.sh \
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check-reqs.sh
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check-reqs.sh pass-as-file.sh
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# parallel.sh
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install-tests += $(foreach x, $(nix_tests), tests/$(x))
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17
tests/pass-as-file.sh
Normal file
17
tests/pass-as-file.sh
Normal file
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@ -0,0 +1,17 @@
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source common.sh
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clearStore
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outPath=$(nix-build --no-out-link -E "
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with import ./config.nix;
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mkDerivation {
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name = \"pass-as-file\";
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passAsFile = [ \"foo\" ];
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foo = [ \"xyzzy\" ];
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builder = builtins.toFile \"builder.sh\" ''
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[ \"\$(cat \$foo)\" = xyzzy ]
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touch \$out
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'';
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}
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")
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