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* Evaluate attributes in sorted order for better determinism.

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This commit is contained in:
Eelco Dolstra 2008-08-25 14:31:29 +00:00
parent c4f1c2114b
commit abec1c0004
1 changed files with 16 additions and 7 deletions
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23
src/libexpr/get-drvs.cc
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@ -175,19 +175,28 @@ static void getDerivations(EvalState & state, Expr e,
nix-env.cc. */
bool combineChannels = drvMap.get(toATerm("_combineChannels"));
for (ATermMap::const_iterator i = drvMap.begin(); i != drvMap.end(); ++i) {
startNest(nest, lvlDebug,
format("evaluating attribute `%1%'") % aterm2String(i->key));
string pathPrefix2 = addToPath(pathPrefix, aterm2String(i->key));
/* Consider the attributes in sorted order to get more
deterministic behaviour in nix-env operations (e.g. when
there are names clashes between derivations, the derivation
bound to the attribute with the "lower" name should take
precedence). */
typedef std::map<string, Expr> AttrsSorted;
AttrsSorted attrsSorted;
foreach (ATermMap::const_iterator, i, drvMap)
attrsSorted[aterm2String(i->key)] = i->value;
foreach (AttrsSorted::iterator, i, attrsSorted) {
startNest(nest, lvlDebug, format("evaluating attribute `%1%'") % i->first);
string pathPrefix2 = addToPath(pathPrefix, i->first);
if (combineChannels)
getDerivations(state, i->value, pathPrefix2, autoArgs, drvs, doneExprs);
else if (getDerivation(state, i->value, pathPrefix2, drvs, doneExprs)) {
getDerivations(state, i->second, pathPrefix2, autoArgs, drvs, doneExprs);
else if (getDerivation(state, i->second, pathPrefix2, drvs, doneExprs)) {
/* If the value of this attribute is itself an
attribute set, should we recurse into it? => Only
if it has a `recurseForDerivations = true'
attribute. */
ATermList es;
Expr e = evalExpr(state, i->value), e2;
Expr e = evalExpr(state, i->second), e2;
if (matchAttrs(e, es)) {
ATermMap attrs(ATgetLength(es));
queryAllAttrs(e, attrs, false);