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* Print a more useful stack trace when an error occurs deep in the 

derivation dependency graph.
This commit is contained in:
Eelco Dolstra 2006-03-24 14:02:44 +00:00
parent b69e469328
commit ef2d4a2da9
1 changed files with 10 additions and 4 deletions
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14
src/libexpr/primops.cc
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@ -229,10 +229,16 @@ static Expr primDerivationStrict(EvalState & state, const ATermVector & args)
ATermMap attrs;
queryAllAttrs(evalExpr(state, args[0]), attrs, true);
/* Figure out the name already (for stack backtraces). */
Expr eDrvName = attrs.get("name");
if (!eDrvName)
throw Error("required attribute `name' missing");
ATerm posDrvName;
if (!matchAttrRHS(eDrvName, eDrvName, posDrvName)) abort();
string drvName = evalString(state, eDrvName);
/* Build the derivation expression by processing the attributes. */
Derivation drv;
string drvName;
string outputHash;
string outputHashAlgo;
@ -252,6 +258,8 @@ static Expr primDerivationStrict(EvalState & state, const ATermVector & args)
} catch (Error & e) {
e.addPrefix(format("while processing the derivation attribute `%1%' at %2%:\n")
% key % showPos(pos));
e.addPrefix(format("while instantiating the derivation named `%1%' at %2%:\n")
% drvName % showPos(posDrvName));
throw;
}
@ -285,8 +293,6 @@ static Expr primDerivationStrict(EvalState & state, const ATermVector & args)
throw Error("required attribute `builder' missing");
if (drv.platform == "")
throw Error("required attribute `system' missing");
if (drvName == "")
throw Error("required attribute `name' missing");
/* If an output hash was given, check it. */
if (outputHash == "")