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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 `nixpkgs#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.

Change-Id: Iac1334e1470137b7ce11dcf845513810230638ec
(cherry picked from commit d4aed18883b361133607296fb6cd789c47427a38)
This commit is contained in:
Tom Bereknyei 2023-08-19 17:03:31 -04:00 committed by lunaphied
parent d3d7489571
commit 4494f9097f
3 changed files with 18 additions and 2 deletions
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4
src/libcmd/installable-flake.cc
View file

@ -28,6 +28,10 @@ namespace nix {
std::vector<std::string> InstallableFlake::getActualAttrPaths()
{
std::vector<std::string> res;
if (attrPaths.size() == 1 && attrPaths.front().starts_with(".")){
res.push_back(attrPaths.front().substr(1));
return res;
}
for (auto & prefix : prefixes)
res.push_back(prefix + *attrPaths.begin());

12
src/libcmd/installables.cc
View file

@ -302,6 +302,11 @@ void completeFlakeRefWithFragment(
completionType = ctAttrs;
auto fragment = prefix.substr(hash + 1);
std::string prefixRoot = "";
if (fragment.starts_with(".")){
fragment = fragment.substr(1);
prefixRoot = ".";
}
auto flakeRefS = std::string(prefix.substr(0, hash));
auto flakeRef = parseFlakeRef(expandTilde(flakeRefS), absPath("."));
@ -310,6 +315,9 @@ void completeFlakeRefWithFragment(
auto root = evalCache->getRoot();
if (prefixRoot == "."){
attrPathPrefixes.clear();
}
/* Complete 'fragment' relative to all the
attrpath prefixes as well as the root of the
flake. */
@ -334,7 +342,7 @@ void completeFlakeRefWithFragment(
auto attrPath2 = (*attr)->getAttrPath(attr2);
/* Strip the attrpath prefix. */
attrPath2.erase(attrPath2.begin(), attrPath2.begin() + attrPathPrefix.size());
completions->add(flakeRefS + "#" + concatStringsSep(".", evalState->symbols.resolve(attrPath2)));
completions->add(flakeRefS + "#" + prefixRoot + concatStringsSep(".", evalState->symbols.resolve(attrPath2)));
}
}
}
@ -345,7 +353,7 @@ void completeFlakeRefWithFragment(
for (auto & attrPath : defaultFlakeAttrPaths) {
auto attr = root->findAlongAttrPath(parseAttrPath(*evalState, attrPath));
if (!attr) continue;
completions->add(flakeRefS + "#");
completions->add(flakeRefS + "#" + prefixRoot);
}
}
}

4
tests/functional/flakes/flakes.sh
View file

@ -79,6 +79,10 @@ nix registry add --registry $registry nixpkgs flake1
nix registry list | grep '^global'
nix registry list | grepInverse '^user' # nothing in user registry
# Test fuzzy and exact flake attribute syntax.
expectStderr 1 nix eval flake1#ERROR | grepQuiet "error:.*does not provide attribute.*or 'ERROR'$"
expectStderr 1 nix eval flake1#.ERROR | grepQuiet "error:.*does not provide attribute 'ERROR'$"
# Test 'nix flake metadata'.
nix flake metadata flake1
nix flake metadata flake1 | grepQuiet 'Locked URL:.*flake1.*'