aliases.nix: always include attr name in error msg#101210
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9999years wants to merge 1 commit intoNixOS:masterfrom
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aliases.nix: always include attr name in error msg#1012109999years wants to merge 1 commit intoNixOS:masterfrom
9999years wants to merge 1 commit intoNixOS:masterfrom
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aliases.nix: errors should include package names In `pkgs/top-level/aliases.nix`, `throw` was used to make packages that were removed error with a more useful message than "attribute 'foobar' missing, at <location>". However, if the error message doesn't include the package's attribute name, it can be difficult to determine what caused it. For example, here's what building a configuration that referenced `ytop` looked like recently (see NixOS#101098): ``` $ nixos-rebuild switch building Nix... building the system configuration... error: Abandoned by upstream. Consider switching to bottom instead (use '--show-trace' to show detailed location information) ``` Therefore, we modify string values in `aliases.nix` to prefix `Attribute foobar in <nixpkgs> has been removed` to the reason message. This makes the removed reasons a bit shorter and provides a place to unilaterally improve these error messages in the future, rather than with one-off changes or large sets of manual fixes.
ofborg
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cole-h
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Oct 20, 2020
| # avoid confusing errors: | ||
| # https://github.com/NixOS/nixpkgs/pull/101098 | ||
| if lib.isString alias then | ||
| throw "Attribute ${n} in <nixpkgs> has been removed; ${alias}" |
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<nixpkgs> might not always exist (e.g. in a flakes-based system). Maybe just s/<nixpkgs>/Nixpkgs/?
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I think this would be a great addition but we also would need more people on agreeing if we want this because otherwise @9999years is fixing merge conflicts forever. |
SuperSandro2000
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2.status: merge conflict
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In
pkgs/top-level/aliases.nix,throwwas used to make packages that were removed error with a more useful message thanattribute 'foobar' missing, at <location>.However, if the error message doesn't include the package's attribute name, it can be difficult to determine what caused it. For example, here's what building a configuration that referenced
ytoplooked like recently (see #101098):Therefore, we modify string values in
aliases.nixto prefixAttribute foobar in <nixpkgs> has been removedto the reason message. This makes the removed reasons a bit shorter and provides a place to unilaterally improve these error messages in the future, rather than with one-off changes or large sets of manual fixes.Built/tested on NixOS.