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Don't use read-only mode for nix build --dry-run

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In dry run mode, new derivations can't be create, so running the command on anything that has not been evaluated before results in an error message of the form `don't know how to build these paths (may be caused by read-only store access)`.

For comparison, the classical `nix-build --dry-run` doesn't use read-only mode.

Closes #1795

(cherry picked from commit 54525682df707742e58311c32e9c9cb18de1e31f)
This commit is contained in:
Georges Dubus 2020-07-03 14:21:31 +02:00 committed by Eelco Dolstra
parent b2e8120d25
commit bc6e7ca046
2 changed files with 2 additions and 2 deletions
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2
src/libcmd/installables.cc
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@ -756,7 +756,7 @@ BuiltPaths build(ref<Store> evalStore, ref<Store> store, Realise mode,
pathsToBuild.insert(pathsToBuild.end(), b.begin(), b.end());
}
if (mode == Realise::Nothing)
if (mode == Realise::Nothing || mode == Realise::Derivation)
printMissing(store, pathsToBuild, lvlError);
else if (mode == Realise::Outputs)
store->buildPaths(pathsToBuild, bMode, evalStore);

2
src/nix/build.cc
View file

@ -54,7 +54,7 @@ struct CmdBuild : InstallablesCommand, MixDryRun, MixJSON, MixProfile
{
auto buildables = build(
getEvalStore(), store,
dryRun ? Realise::Nothing : Realise::Outputs,
dryRun ? Realise::Derivation : Realise::Outputs,
installables, buildMode);
if (json) logger->cout("%s", derivedPathsWithHintsToJSON(buildables, store).dump());