* New primop: builtins.toFile, which writes a string into the store
and returns its path. This can be used to (for instance) write builders inside a Nix expression, e.g., stdenv.mkDerivation { builder = " source $stdenv/setup ... "; ... }
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2 changed files with 36 additions and 6 deletions
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@ -467,6 +467,9 @@ static Expr primToString(EvalState & state, const ATermVector & args)
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}
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/* Convert the argument (which can be any Nix expression) to an XML
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representation returned in a string. Not all Nix expressions can
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be sensibly or completely represented (e.g., functions). */
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static Expr primToXML(EvalState & state, const ATermVector & args)
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{
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ostringstream out;
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@ -475,6 +478,16 @@ static Expr primToXML(EvalState & state, const ATermVector & args)
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}
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/* Store a string in the Nix store as a source file that can be used
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as an input by derivations. */
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static Expr primToFile(EvalState & state, const ATermVector & args)
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{
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string s = evalString(state, args[0]);
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Path storePath = addTextToStore("", s, PathSet());
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return makePath(toATerm(storePath));
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}
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/* Boolean constructors. */
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static Expr primTrue(EvalState & state, const ATermVector & args)
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{
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@ -724,6 +737,7 @@ void EvalState::addPrimOps()
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addPrimOp("dirOf", 1, primDirOf);
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addPrimOp("toString", 1, primToString);
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addPrimOp("__toXML", 1, primToXML);
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addPrimOp("__toFile", 1, primToFile);
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addPrimOp("isNull", 1, primIsNull);
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addPrimOp("dependencyClosure", 1, primDependencyClosure);
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addPrimOp("abort", 1, primAbort);
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@ -1,7 +1,23 @@
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derivation {
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let {
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# Test inline source file definitions.
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builder = builtins.toFile "
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mkdir $out
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cat > $out/program <<EOF
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#! $SHELL
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sleep 10000
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EOF
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chmod +x $out/program
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";
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body = derivation {
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name = "gc-runtime";
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system = "@system@";
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builder = "@shell@";
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args = ["-e" "-x" ./gc-runtime.builder.sh];
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args = ["-e" "-x" builder];
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PATH = "@testPath@";
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};
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}
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