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nix-env: Load files in ~/.nix-defexpr on demand 

So if you do "nix-env -qa -A nixos", then other channels won't be
parsed/evaluated at all.
This commit is contained in:
Eelco Dolstra 2013-09-03 15:45:32 +02:00
parent c57ed84e28
commit 07a08bddf0
3 changed files with 18 additions and 3 deletions
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6
src/libexpr/eval.cc
View File

@ -222,6 +222,12 @@ void EvalState::addPrimOp(const string & name,
}
void EvalState::getBuiltin(const string & name, Value & v)
{
v = *baseEnv.values[0]->attrs->find(symbols.create(name))->value;
}
/* Every "format" object (even temporary) takes up a few hundred bytes
of stack space, which is a real killer in the recursive
evaluator. So here are some helper functions for throwing

6
src/libexpr/eval.hh
View File

@ -203,6 +203,12 @@ private:
void addPrimOp(const string & name,
unsigned int arity, PrimOpFun primOp);
public:
void getBuiltin(const string & name, Value & v);
private:
inline Value * lookupVar(Env * env, const VarRef & var, bool noEval);
friend class ExprVar;

9
src/nix-env/nix-env.cc
View File

@ -131,9 +131,12 @@ static void getAllExprs(EvalState & state,
continue;
}
attrs.insert(attrName);
// FIXME: make loading lazy.
Value & v2(*state.allocAttr(v, state.symbols.create(attrName)));
state.evalFile(path2, v2);
/* Load the expression on demand. */
Value & vFun(*state.allocValue());
Value & vArg(*state.allocValue());
state.getBuiltin("import", vFun);
mkString(vArg, path2);
mkApp(*state.allocAttr(v, state.symbols.create(attrName)), vFun, vArg);
}
else if (S_ISDIR(st.st_mode))
/* `path2' is a directory (with no default.nix in it);