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nixos/manual: improve error message for invalid values in `relatedPackages'

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As reported in NixOS discourse[1], tracking down invalid values in
`relatedPackages'[2] (i.e. list-items that don't exist in `pkgs`) is
fairly hard as the message "Invalid package attribute path `foobar'"
is quite unhelpful and the trace doesn't point to the source of the
problem either.

This patch improves the error message by mentioning that the issue is an
invalid `relatedPackages`-declaration in $optionName.

[1] https://discourse.nixos.org/t/invalid-package-attribute-path-nextcloud19/8403/9
[2] https://nixos.org/nixpkgs/manual/#sec-functions-library-options
This commit is contained in:
Maximilian Bosch 2020-08-03 16:32:15 +02:00
parent 3c155bb20c
commit 6d19c04416
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GPG Key ID: 091DBF4D1FC46B8E
1 changed files with 3 additions and 3 deletions
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6
nixos/lib/make-options-doc/default.nix
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@ -36,7 +36,7 @@ let
// lib.optionalAttrs (opt ? example) { example = substFunction opt.example; }
// lib.optionalAttrs (opt ? default) { default = substFunction opt.default; }
// lib.optionalAttrs (opt ? type) { type = substFunction opt.type; }
// lib.optionalAttrs (opt ? relatedPackages && opt.relatedPackages != []) { relatedPackages = genRelatedPackages opt.relatedPackages; }
// lib.optionalAttrs (opt ? relatedPackages && opt.relatedPackages != []) { relatedPackages = genRelatedPackages opt.relatedPackages opt.name; }
);
# Generate DocBook documentation for a list of packages. This is
@ -48,7 +48,7 @@ let
# - a list: that will be interpreted as an attribute path from `pkgs`,
# - an attrset: that can specify `name`, `path`, `package`, `comment`
# (either of `name`, `path` is required, the rest are optional).
genRelatedPackages = packages:
genRelatedPackages = packages: optName:
let
unpack = p: if lib.isString p then { name = p; }
else if lib.isList p then { path = p; }
@ -58,7 +58,7 @@ let
title = args.title or null;
name = args.name or (lib.concatStringsSep "." args.path);
path = args.path or [ args.name ];
package = args.package or (lib.attrByPath path (throw "Invalid package attribute path `${toString path}'") pkgs);
package = args.package or (lib.attrByPath path (throw "Invalid package attribute path `${toString path}' found while evaluating `relatedPackages' of option `${optName}'") pkgs);
in "<listitem>"
+ "<para><literal>${lib.optionalString (title != null) "${title} aka "}pkgs.${name} (${package.meta.name})</literal>"
+ lib.optionalString (!package.meta.available) " <emphasis>[UNAVAILABLE]</emphasis>"