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feat: notation to refer to no attribute search prefix

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An attrPath prefix of "." indicates no need to try default attrPath prefixes. For example 1nixpkgs#legacyPackages.x86_64-linux.ERROR` searches through

```
trying flake output attribute 'packages.x86_64-linux.legacyPackages.x86_64-linux.ERROR'
using cached attrset attribute ''
trying flake output attribute 'legacyPackages.x86_64-linux.legacyPackages.x86_64-linux.ERROR'
using cached attrset attribute 'legacyPackages.x86_64-linux'
trying flake output attribute 'legacyPackages.x86_64-linux.ERROR'
using cached attrset attribute 'legacyPackages.x86_64-linux'
```

And there is no way to specify that one does not want the automatic
search behavior. Now one can specify
`nixpkgs#.legacyPackages.x86_64-linux.ERROR` to only refer to the rooted
attribute path without any default injection of attribute search path or
system.
This commit is contained in:
Tom Bereknyei 2023-08-19 17:03:31 -04:00
parent 10afcf06aa
commit 52248b1c27
2 changed files with 15 additions and 2 deletions
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5
src/libcmd/installable-flake.cc
View file

@ -28,6 +28,11 @@ namespace nix {
std::vector<std::string> InstallableFlake::getActualAttrPaths()
{
std::vector<std::string> res;
if (attrPaths.size() == 1 && attrPaths.front().starts_with(".")){
attrPaths.front().erase(0,1);
res.push_back(attrPaths.front());
return res;
}
for (auto & prefix : prefixes)
res.push_back(prefix + *attrPaths.begin());