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-rw-r--r--doc/guix.texi4
-rw-r--r--nix/libstore/build.cc45
2 files changed, 42 insertions, 7 deletions
diff --git a/doc/guix.texi b/doc/guix.texi
index cd4e550ef3..4222e011e5 100644
--- a/doc/guix.texi
+++ b/doc/guix.texi
@@ -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.
diff --git a/nix/libstore/build.cc b/nix/libstore/build.cc
index d51705b48f..2d3960bf89 100644
--- a/nix/libstore/build.cc
+++ b/nix/libstore/build.cc
@@ -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;