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Don't crash nix-build when not all outputs are realised

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Change the `nix-build` logic for linking/printing the output paths to allow for
some outputs to be missing. This might happen when the toplevel
derivation didn't have to be built, either because all the required
outputs were already there, or because they have all been substituted.
This commit is contained in:
regnat 2020-12-08 20:38:37 +01:00 committed by Théophane Hufschmitt
parent cd44c0af71
commit 263f6dbd1c
1 changed files with 4 additions and 2 deletions
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6
src/nix-build/nix-build.cc
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@ -518,9 +518,11 @@ static void main_nix_build(int argc, char * * argv)
if (counter)
drvPrefix += fmt("-%d", counter + 1);
auto builtOutputs = store->queryDerivationOutputMap(drvPath);
auto builtOutputs = store->queryPartialDerivationOutputMap(drvPath);
auto outputPath = builtOutputs.at(outputName);
auto maybeOutputPath = builtOutputs.at(outputName);
assert(maybeOutputPath);
auto outputPath = *maybeOutputPath;
if (auto store2 = store.dynamic_pointer_cast<LocalFSStore>()) {
std::string symlink = drvPrefix;