From 7974aae81ced67b2aee0b537a37d813f6c67a1ec Mon Sep 17 00:00:00 2001 From: Eelco Dolstra Date: Fri, 1 Sep 2006 12:07:31 +0000 Subject: * 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 ... "; ... } --- src/libexpr/primops.cc | 14 ++++++++++++++ 1 file changed, 14 insertions(+) (limited to 'src') diff --git a/src/libexpr/primops.cc b/src/libexpr/primops.cc index 8a513c5213fd..5dfe90a8f96c 100644 --- a/src/libexpr/primops.cc +++ b/src/libexpr/primops.cc @@ -467,6 +467,9 @@ static Expr primToString(EvalState & state, const ATermVector & args) } +/* Convert the argument (which can be any Nix expression) to an XML + representation returned in a string. Not all Nix expressions can + be sensibly or completely represented (e.g., functions). */ static Expr primToXML(EvalState & state, const ATermVector & args) { ostringstream out; @@ -475,6 +478,16 @@ static Expr primToXML(EvalState & state, const ATermVector & args) } +/* Store a string in the Nix store as a source file that can be used + as an input by derivations. */ +static Expr primToFile(EvalState & state, const ATermVector & args) +{ + string s = evalString(state, args[0]); + Path storePath = addTextToStore("", s, PathSet()); + return makePath(toATerm(storePath)); +} + + /* Boolean constructors. */ static Expr primTrue(EvalState & state, const ATermVector & args) { @@ -724,6 +737,7 @@ void EvalState::addPrimOps() addPrimOp("dirOf", 1, primDirOf); addPrimOp("toString", 1, primToString); addPrimOp("__toXML", 1, primToXML); + addPrimOp("__toFile", 1, primToFile); addPrimOp("isNull", 1, primIsNull); addPrimOp("dependencyClosure", 1, primDependencyClosure); addPrimOp("abort", 1, primAbort); -- cgit 1.4.1