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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
This commit is contained in:
Georges Dubus 2020-07-03 14:21:31 +02:00 committed by Georges Dubus
parent 199081ad00
commit 54525682df
2 changed files with 2 additions and 2 deletions
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2
src/libcmd/installables.cc
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@ -716,7 +716,7 @@ Buildables build(ref<Store> store, Realise mode,
}
}
if (mode == Realise::Nothing)
if (mode == Realise::Nothing || mode == Realise::Derivation)
printMissing(store, pathsToBuild, lvlError);
else if (mode == Realise::Outputs)
store->buildPaths(pathsToBuild, bMode);

2
src/nix/build.cc
View file

@ -52,7 +52,7 @@ struct CmdBuild : InstallablesCommand, MixDryRun, MixJSON, MixProfile
void run(ref<Store> store) override
{
auto buildables = build(store, dryRun ? Realise::Nothing : Realise::Outputs, installables, buildMode);
auto buildables = build(store, dryRun ? Realise::Derivation : Realise::Outputs, installables, buildMode);
if (dryRun) return;