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daemon: rounds: Keep the differing output if -K is given. 

Regardless of -K, we now also print which output differs.
This commit is contained in:
Eelco Dolstra 2016-01-12 18:25:57 +01:00 committed by Ludovic Courtès
parent 56b8f56788
commit b4528110c6
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2 changed files with 42 additions and 7 deletions
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4
doc/guix.texi
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@ -998,6 +998,10 @@ consecutive build results are not bit-for-bit identical. Note that this
setting can be overridden by clients such as @command{guix build}
(@pxref{Invoking guix build}).
When used in conjunction with @option{--keep-failed}, the differing
output is kept in the store, under @file{/gnu/store/@dots{}-check}.
This makes it easy to look for differences between the two results.
@item --debug
Produce debugging output.

45
nix/libstore/build.cc
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@ -2320,6 +2320,8 @@ void DerivationGoal::registerOutputs()
outputs to allow hard links between outputs. */
InodesSeen inodesSeen;
Path checkSuffix = "-check";
/* Check whether the output paths were created, and grep each
output path to determine what other paths it references. Also make all
output paths read-only. */
@ -2433,7 +2435,7 @@ void DerivationGoal::registerOutputs()
ValidPathInfo info = worker.store.queryPathInfo(path);
if (hash.first != info.hash) {
if (settings.keepFailed) {
Path dst = path + "-check";
Path dst = path + checkSuffix;
if (pathExists(dst)) deletePath(dst);
if (rename(actualPath.c_str(), dst.c_str()))
throw SysError(format("renaming `%1%' to `%2%'") % actualPath % dst);
@ -2487,9 +2489,11 @@ void DerivationGoal::registerOutputs()
checkRefs("disallowedReferences", false, false);
checkRefs("disallowedRequisites", false, true);
worker.store.optimisePath(path); // FIXME: combine with scanForReferences()
if (curRound == nrRounds) {
worker.store.optimisePath(path); // FIXME: combine with scanForReferences()
worker.store.markContentsGood(path);
worker.store.markContentsGood(path);
}
ValidPathInfo info;
info.path = path;
@ -2502,10 +2506,37 @@ void DerivationGoal::registerOutputs()
if (buildMode == bmCheck) return;
if (curRound > 1 && prevInfos != infos)
throw NotDeterministic(
format("result of ‘%1%’ differs from previous round; rejecting as non-deterministic")
% drvPath);
/* Compare the result with the previous round, and report which
path is different, if any.*/
if (curRound > 1 && prevInfos != infos) {
assert(prevInfos.size() == infos.size());
for (auto i = prevInfos.begin(), j = infos.begin(); i != prevInfos.end(); ++i, ++j)
if (!(*i == *j)) {
Path prev = i->path + checkSuffix;
if (pathExists(prev))
throw NotDeterministic(
format("output ‘%1%’ of ‘%2%’ differs from ‘%3%’ from previous round")
% i->path % drvPath % prev);
else
throw NotDeterministic(
format("output ‘%1%’ of ‘%2%’ differs from previous round")
% i->path % drvPath);
}
assert(false); // shouldn't happen
}
if (settings.keepFailed) {
for (auto & i : drv.outputs) {
Path prev = i.second.path + checkSuffix;
if (pathExists(prev)) deletePath(prev);
if (curRound < nrRounds) {
Path dst = i.second.path + checkSuffix;
if (rename(i.second.path.c_str(), dst.c_str()))
throw SysError(format("renaming ‘%1%’ to ‘%2%’") % i.second.path % dst);
}
}
}
if (curRound < nrRounds) {
prevInfos = infos;