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InstallableFlake: Show all possible attribute names

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E.g.

  $ nix run nixpkgs#hello
  error: --- Error ---------- nix
  flake 'flake:nixpkgs' does not provide attribute 'apps.x86_64-linux.hello' or 'hello'

instead of

  $ nix run nixpkgs#hello
  error: --- Error ---------- nix
  flake 'flake:nixpkgs' does not provide attribute 'hello'
This commit is contained in:
Eelco Dolstra 2020-06-17 17:13:01 +02:00
parent ad66fb0a37
commit 5332c439d0
1 changed files with 12 additions and 2 deletions
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14
src/nix/installables.cc
View file

@ -440,6 +440,16 @@ ref<eval_cache::EvalCache> openEvalCache(
})); }));
} }
static std::string showAttrPaths(const std::vector<std::string> & paths)
{
std::string s;
for (const auto & [n, i] : enumerate(paths)) {
if (n > 0) s += n + 1 == paths.size() ? " or " : ", ";
s += '\''; s += i; s += '\'';
}
return s;
}
std::tuple<std::string, FlakeRef, InstallableValue::DerivationInfo> InstallableFlake::toDerivation() std::tuple<std::string, FlakeRef, InstallableValue::DerivationInfo> InstallableFlake::toDerivation()
{ {
@ -477,7 +487,7 @@ std::tuple<std::string, FlakeRef, InstallableValue::DerivationInfo> InstallableF
} }
throw Error("flake '%s' does not provide attribute %s", throw Error("flake '%s' does not provide attribute %s",
flakeRef, concatStringsSep(", ", quoteStrings(attrPaths))); flakeRef, showAttrPaths(getActualAttrPaths()));
} }
std::vector<InstallableValue::DerivationInfo> InstallableFlake::toDerivations() std::vector<InstallableValue::DerivationInfo> InstallableFlake::toDerivations()
@ -505,7 +515,7 @@ std::pair<Value *, Pos> InstallableFlake::toValue(EvalState & state)
} }
throw Error("flake '%s' does not provide attribute %s", throw Error("flake '%s' does not provide attribute %s",
flakeRef, concatStringsSep(", ", quoteStrings(attrPaths))); flakeRef, showAttrPaths(getActualAttrPaths()));
} }
std::vector<std::pair<std::shared_ptr<eval_cache::AttrCursor>, std::string>> std::vector<std::pair<std::shared_ptr<eval_cache::AttrCursor>, std::string>>