forked from lix-project/lix
Add a hook to run diffoscope when non-determinism is detected
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@ -2688,6 +2688,8 @@ void DerivationGoal::registerOutputs()
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InodesSeen inodesSeen;
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Path checkSuffix = "-check";
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bool runDiffHook = settings.get("run-diff-hook", false);
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bool keepPreviousRound = settings.keepFailed || runDiffHook;
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/* Check whether the output paths were created, and grep each
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output path to determine what other paths it references. Also make all
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@ -2919,25 +2921,39 @@ void DerivationGoal::registerOutputs()
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if (!(*i == *j)) {
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result.isNonDeterministic = true;
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Path prev = i->path + checkSuffix;
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auto msg = pathExists(prev)
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bool prevExists = keepPreviousRound && pathExists(prev);
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auto msg = prevExists
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? fmt("output ‘%1%’ of ‘%2%’ differs from ‘%3%’ from previous round", i->path, drvPath, prev)
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: fmt("output ‘%1%’ of ‘%2%’ differs from previous round", i->path, drvPath);
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auto diffHook = settings.get("diff-hook", std::string(""));
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if (prevExists && diffHook != "" && runDiffHook) {
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try {
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auto diff = runProgram(diffHook, true, {prev, i->path});
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if (diff != "")
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printError(chomp(diff));
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} catch (Error & error) {
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printError("diff hook execution failed: %s", error.what());
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}
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}
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if (settings.get("enforce-determinism", true))
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throw NotDeterministic(msg);
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printError(msg);
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curRound = nrRounds; // we know enough, bail out early
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}
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}
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if (settings.keepFailed) {
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/* If this is the first round of several, then move the output out
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of the way. */
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if (nrRounds > 1 && curRound == 1 && curRound < nrRounds && keepPreviousRound) {
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for (auto & i : drv->outputs) {
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Path prev = i.second.path + checkSuffix;
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deletePath(prev);
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if (curRound < nrRounds) {
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Path dst = i.second.path + checkSuffix;
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if (rename(i.second.path.c_str(), dst.c_str()))
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throw SysError(format("renaming ‘%1%’ to ‘%2%’") % i.second.path % dst);
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}
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Path dst = i.second.path + checkSuffix;
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if (rename(i.second.path.c_str(), dst.c_str()))
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throw SysError(format("renaming ‘%1%’ to ‘%2%’") % i.second.path % dst);
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}
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}
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@ -2946,6 +2962,15 @@ void DerivationGoal::registerOutputs()
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return;
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}
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/* Remove the -check directories if we're done. FIXME: keep them
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if the result was not determistic? */
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if (curRound == nrRounds) {
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for (auto & i : drv->outputs) {
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Path prev = i.second.path + checkSuffix;
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deletePath(prev);
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}
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}
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/* Register each output path as valid, and register the sets of
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paths referenced by each of them. If there are cycles in the
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outputs, this will fail. */
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@ -843,6 +843,7 @@ static void opServe(Strings opFlags, Strings opArgs)
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if (GET_PROTOCOL_MINOR(clientVersion) >= 3) {
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settings.set("build-repeat", std::to_string(readInt(in)));
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settings.set("enforce-determinism", readInt(in) != 0 ? "true" : "false");
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settings.set("run-diff-hook", "true");
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}
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settings.printRepeatedBuilds = false;
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};
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