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nix-env: Add a suggestion for when there's a name collision in channels

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help new users find a solution to their problem

./result/bin/nix-env -qa hello
warning: name collision in input Nix expressions, skipping '/home/artturin/.nix-defexpr/channels_root/master'
suggestion: remove 'master' from either the root channels or the user channels
hello-2.12
hello-2.12
This commit is contained in:
Artturin 2022-03-12 23:58:29 +02:00
parent d5322698a2
commit cb1a76112e
1 changed files with 6 additions and 1 deletions
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7
src/nix-env/nix-env.cc
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@ -128,7 +128,12 @@ static void getAllExprs(EvalState & state,
if (hasSuffix(attrName, ".nix"))
attrName = std::string(attrName, 0, attrName.size() - 4);
if (!seen.insert(attrName).second) {
printError("warning: name collision in input Nix expressions, skipping '%1%'", path2);
std::string suggestionMessage = "";
if (path2.find("channels") != std::string::npos && path.find("channels") != std::string::npos) {
suggestionMessage = fmt("\nsuggestion: remove '%s' from either the root channels or the user channels", attrName);
}
printError("warning: name collision in input Nix expressions, skipping '%1%'"
"%2%", path2, suggestionMessage);
continue;
}
/* Load the expression on demand. */