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Fix empty 'nix copy' error message

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This was caused by SubstitutionGoal not setting the errorMsg field in
its BuildResult. We now get a more descriptive message than in 2.7.0, e.g.

  error: path '/nix/store/13mh...' is required, but there is no substituter that can build it

instead of the misleading (since there was no build)

  error: build of '/nix/store/13mh...' failed

Fixes #6295.
This commit is contained in:
Eelco Dolstra 2022-04-06 12:41:18 +02:00
parent fbeb8fd1b4
commit 318936366d
3 changed files with 19 additions and 7 deletions
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2
src/libstore/build/drv-output-substitution-goal.cc
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@ -41,7 +41,7 @@ void DrvOutputSubstitutionGoal::tryNext()
if (subs.size() == 0) {
/* None left. Terminate this goal and let someone else deal
with it. */
debug("drv output '%s' is required, but there is no substituter that can provide it", id.to_string());
debug("derivation output '%s' is required, but there is no substituter that can provide it", id.to_string());
/* Hack: don't indicate failure if there were no substituters.
In that case the calling derivation should just do a