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libstore: report all differing outputs rather than just the first

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Before:

error: derivation '/nix/store/4spy3nz1661zm15gkybsy1h5f36aliwx-python3.11-test-1.0.0.drv' may not be deterministic: output '/nix/store/ccqcp01zg18wp9iadzmzimqzdi3ll08d-python3.11-test-1.0.0-dist' differs from '/nix/store/ccqcp01zg18wp9iadzmzimqzdi3ll08d-python3.11-test-1.0.0-dist.check'

After:

error: derivation '4spy3nz1661zm15gkybsy1h5f36aliwx-python3.11-test-1.0.0.drv' may not be deterministic: outputs differ
         output differs: output '/nix/store/ccqcp01zg18wp9iadzmzimqzdi3ll08d-python3.11-test-1.0.0-dist' differs from '/nix/store/ccqcp01zg18wp9iadzmzimqzdi3ll08d-python3.11-test-1.0.0-dist.check'
         output differs: output '/nix/store/yl59v08356i841c560alb0zmk7q16klb-python3.11-test-1.0.0' differs from '/nix/store/yl59v08356i841c560alb0zmk7q16klb-python3.11-test-1.0.0.check'

Change-Id: Ib2871fa602bf1fa9c00e2565b3a2e1b26f908152
This commit is contained in:
Linus Heckemann 2024-10-15 10:53:08 +02:00
parent f6077314fa
commit 8b0ac51f12
5 changed files with 59 additions and 11 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

4
doc/manual/change-authors.yml
View file

@ -85,6 +85,10 @@ kloenk:
forgejo: kloenk
github: kloenk
lheckemann:
forgejo: lheckemann
github: lheckemann
lovesegfault:
github: lovesegfault

22
doc/manual/rl-next/report-differing-outputs.md Normal file
View file

@ -0,0 +1,22 @@
---
synopsis: "Reproducibility check builds now report all differing outputs"
cls: [2069]
category: Improvements
credits: [lheckemann]
---
`nix-build --check` allows rerunning the build of an already-built derivation to check that it produces the same output again.
If a multiple-output derivation with impure behaviour is built with `--check`, only the first output would be shown in the resulting error message (and kept for comparison):
```
error: derivation '/nix/store/4spy3nz1661zm15gkybsy1h5f36aliwx-python3.11-test-1.0.0.drv' may not be deterministic: output '/nix/store/ccqcp01zg18wp9iadzmzimqzdi3ll08d-python3.11-test
-1.0.0-dist' differs from '/nix/store/ccqcp01zg18wp9iadzmzimqzdi3ll08d-python3.11-test-1.0.0-dist.check'
```
Now, all differing outputs are kept and reported:
```
error: derivation '4spy3nz1661zm15gkybsy1h5f36aliwx-python3.11-test-1.0.0.drv' may not be deterministic: outputs differ
output differs: output '/nix/store/ccqcp01zg18wp9iadzmzimqzdi3ll08d-python3.11-test-1.0.0-dist' differs from '/nix/store/ccqcp01zg18wp9iadzmzimqzdi3ll08d-python3.11-test-1.0.0-dist.check'
output differs: output '/nix/store/yl59v08356i841c560alb0zmk7q16klb-python3.11-test-1.0.0' differs from '/nix/store/yl59v08356i841c560alb0zmk7q16klb-python3.11-test-1.0.0.check'
```

24
src/libstore/build/local-derivation-goal.cc
View file

@ -2021,6 +2021,8 @@ SingleDrvOutputs LocalDerivationGoal::registerOutputs()
OutputPathMap finalOutputs;
std::vector<std::pair<Path, std::optional<Path>>> nondeterministic;
for (auto & outputName : sortedOutputNames) {
auto output = get(drv->outputs, outputName);
auto scratchPath = get(scratchOutputs, outputName);
@ -2307,20 +2309,20 @@ SingleDrvOutputs LocalDerivationGoal::registerOutputs()
buildUser ? buildUser->getGID() : getgid(),
finalDestPath, dst, worker.store.printStorePath(drvPath), tmpDir);
throw NotDeterministic("derivation '%s' may not be deterministic: output '%s' differs from '%s'",
worker.store.printStorePath(drvPath), worker.store.toRealPath(finalDestPath), dst);
nondeterministic.push_back(std::make_pair(worker.store.toRealPath(finalDestPath), dst));
} else
throw NotDeterministic("derivation '%s' may not be deterministic: output '%s' differs",
worker.store.printStorePath(drvPath), worker.store.toRealPath(finalDestPath));
nondeterministic.push_back(std::make_pair(worker.store.toRealPath(finalDestPath), std::nullopt));
}
/* Since we verified the build, it's now ultimately trusted. */
if (!oldInfo.ultimate) {
else if (!oldInfo.ultimate) {
oldInfo.ultimate = true;
localStore.signPathInfo(oldInfo);
localStore.registerValidPaths({{oldInfo.path, oldInfo}});
}
/* Don't register anything, since we already have the
previous versions which we're comparing. */
continue;
}
@ -2351,6 +2353,18 @@ SingleDrvOutputs LocalDerivationGoal::registerOutputs()
}
if (buildMode == bmCheck) {
if (!nondeterministic.empty()) {
std::ostringstream msg;
msg << HintFmt("derivation '%s' may not be deterministic: outputs differ", drvPath.to_string());
for (auto [oldPath, newPath]: nondeterministic) {
if (newPath) {
msg << HintFmt("\n output differs: output '%s' differs from '%s'", oldPath.c_str(), *newPath);
} else {
msg << HintFmt("\n output '%s' differs", oldPath.c_str());
}
}
throw NotDeterministic(msg.str());
}
/* In case of fixed-output derivations, if there are
mismatches on `--check` an error must be thrown as this is
also a source for non-determinism. */

18
tests/functional/check.nix
View file

@ -6,10 +6,12 @@ with import ./config.nix;
nondeterministic = mkDerivation {
inherit checkBuildId;
name = "nondeterministic";
outputs = ["a" "b"];
buildCommand =
''
mkdir $out
date +%s.%N > $out/date
mkdir $a $b
date +%s.%N > $a/date
date +%s.%N > $b/date
echo "CHECK_TMPDIR=$TMPDIR"
echo "checkBuildId=$checkBuildId"
echo "$checkBuildId" > $TMPDIR/checkBuildId
@ -19,10 +21,12 @@ with import ./config.nix;
deterministic = mkDerivation {
inherit checkBuildId;
name = "deterministic";
outputs = ["a" "b"];
buildCommand =
''
mkdir $out
echo date > $out/date
mkdir $a $b
echo date > $a/date
echo date > $b/date
echo "CHECK_TMPDIR=$TMPDIR"
echo "checkBuildId=$checkBuildId"
echo "$checkBuildId" > $TMPDIR/checkBuildId
@ -32,10 +36,12 @@ with import ./config.nix;
failed = mkDerivation {
inherit checkBuildId;
name = "failed";
outputs = ["a" "b"];
buildCommand =
''
mkdir $out
echo date > $out/date
mkdir $a $b
echo date > $a/date
echo date > $b/date
echo "CHECK_TMPDIR=$TMPDIR"
echo "checkBuildId=$checkBuildId"
echo "$checkBuildId" > $TMPDIR/checkBuildId

2
tests/functional/check.sh
View file

@ -65,6 +65,8 @@ checkBuildTempDirRemoved $TEST_ROOT/log
nix-build check.nix -A nondeterministic --argstr checkBuildId $checkBuildId \
--no-out-link --check 2> $TEST_ROOT/log || status=$?
grep 'may not be deterministic' $TEST_ROOT/log
# the differences in both outputs should be reported
[[ $(grep -c 'differs' $TEST_ROOT/log) = 2 ]]
[ "$status" = "104" ]
checkBuildTempDirRemoved $TEST_ROOT/log