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Merge pull request #4257 from hercules-ci/issue-4197-nix-build-output-order

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Issue 4197 nix build output order
This commit is contained in:
Eelco Dolstra 2020-11-16 10:15:28 +01:00 committed by GitHub
commit 399c7f3f8b
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3 changed files with 59 additions and 11 deletions
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8
src/nix-build/nix-build.cc
View file

@ -487,6 +487,7 @@ static void main_nix_build(int argc, char * * argv)
else {
std::vector<StorePathWithOutputs> pathsToBuild;
std::vector<std::pair<StorePath, std::string>> pathsToBuildOrdered;
std::map<StorePath, std::pair<size_t, StringSet>> drvMap;
@ -498,6 +499,7 @@ static void main_nix_build(int argc, char * * argv)
throw Error("derivation '%s' lacks an 'outputName' attribute", store->printStorePath(drvPath));
pathsToBuild.push_back({drvPath, {outputName}});
pathsToBuildOrdered.push_back({drvPath, {outputName}});
auto i = drvMap.find(drvPath);
if (i != drvMap.end())
@ -513,15 +515,14 @@ static void main_nix_build(int argc, char * * argv)
std::vector<StorePath> outPaths;
for (auto & [drvPath, info] : drvMap) {
auto & [counter, wantedOutputs] = info;
for (auto & [drvPath, outputName] : pathsToBuildOrdered) {
auto & [counter, _wantedOutputs] = drvMap.at({drvPath});
std::string drvPrefix = outLink;
if (counter)
drvPrefix += fmt("-%d", counter + 1);
auto builtOutputs = store->queryDerivationOutputMap(drvPath);
for (auto & outputName : wantedOutputs) {
auto outputPath = builtOutputs.at(outputName);
if (auto store2 = store.dynamic_pointer_cast<LocalFSStore>()) {
@ -532,7 +533,6 @@ static void main_nix_build(int argc, char * * argv)
outPaths.push_back(outputPath);
}
}
logger->stop();

33
tests/nix-build-examples.nix Normal file
View file

@ -0,0 +1,33 @@
with import ./config.nix;
rec {
input0 = mkDerivation {
name = "dependencies-input-0";
buildCommand = "mkdir $out; echo foo > $out/bar";
};
input1 = mkDerivation {
name = "dependencies-input-1";
buildCommand = "mkdir $out; echo FOO > $out/foo";
};
input2 = mkDerivation {
name = "dependencies-input-2";
buildCommand = ''
mkdir $out
echo BAR > $out/bar
echo ${input0} > $out/input0
'';
};
body = mkDerivation {
name = "dependencies-top";
builder = ./dependencies.builder0.sh + "/FOOBAR/../.";
input1 = input1 + "/.";
input2 = "${input2}/.";
input1_drv = input1;
meta.description = "Random test package";
};
}

15
tests/nix-build.sh
View file

@ -26,3 +26,18 @@ outPath2=$(nix-build $(nix-instantiate dependencies.nix)!out --no-out-link)
outPath2=$(nix-store -r $(nix-instantiate --add-root $TEST_ROOT/indirect dependencies.nix)!out)
[[ $outPath = $outPath2 ]]
# The order of the paths on stdout must correspond to the -A options
# https://github.com/NixOS/nix/issues/4197
input0="$(nix-build nix-build-examples.nix -A input0 --no-out-link)"
input1="$(nix-build nix-build-examples.nix -A input1 --no-out-link)"
input2="$(nix-build nix-build-examples.nix -A input2 --no-out-link)"
body="$(nix-build nix-build-examples.nix -A body --no-out-link)"
outPathsA="$(echo $(nix-build nix-build-examples.nix -A input0 -A input1 -A input2 -A body --no-out-link))"
[[ "$outPathsA" = "$input0 $input1 $input2 $body" ]]
# test a different ordering to make sure it fails, not just in 23 out of 24 permutations
outPathsB="$(echo $(nix-build nix-build-examples.nix -A body -A input1 -A input2 -A input0 --no-out-link))"
[[ "$outPathsB" = "$body $input1 $input2 $input0" ]]