* Restore the __overrides feature that was lost somewhere in the
fast-eval branch.
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@ -108,6 +108,7 @@ EvalState::EvalState()
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, sMeta(symbols.create("meta"))
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, sName(symbols.create("name"))
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, sSystem(symbols.create("system"))
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, sOverrides(symbols.create("__overrides"))
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, baseEnv(allocEnv(128))
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, baseEnvDispl(0)
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, staticBaseEnv(false, 0)
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@ -428,8 +429,8 @@ void ExprAttrs::eval(EvalState & state, Env & env, Value & v)
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environment. */
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foreach (Attrs::iterator, i, attrs) {
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nix::Attr & a = (*v.attrs)[i->first];
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mkCopy(a.value, env2.values[displ]);
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mkThunk(env2.values[displ++], env2, i->second.first);
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mkThunk(a.value, env2, i->second.first);
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mkCopy(env2.values[displ++], a.value);
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a.pos = &i->second.second;
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}
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@ -443,6 +444,22 @@ void ExprAttrs::eval(EvalState & state, Env & env, Value & v)
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a.pos = &i->second;
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}
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/* If the rec contains an attribute called `__overrides', then
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evaluate it, and add the attributes in that set to the rec.
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This allows overriding of recursive attributes, which is
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otherwise not possible. (You can use the // operator to
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replace an attribute, but other attributes in the rec will
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still reference the original value, because that value has
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been substituted into the bodies of the other attributes.
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Hence we need __overrides.) */
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Bindings::iterator overrides = v.attrs->find(state.sOverrides);
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if (overrides != v.attrs->end()) {
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state.forceAttrs(overrides->second.value);
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foreach (Bindings::iterator, i, *overrides->second.value.attrs) {
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nix::Attr & a = (*v.attrs)[i->first];
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mkCopy(a.value, i->second.value);
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}
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}
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}
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else {
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@ -181,7 +181,8 @@ public:
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SymbolTable symbols;
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const Symbol sWith, sOutPath, sDrvPath, sType, sMeta, sName, sSystem;
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const Symbol sWith, sOutPath, sDrvPath, sType, sMeta, sName,
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sSystem, sOverrides;
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private:
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SrcToStore srcToStore;
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