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manual: update meta-attributes section

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Promote the `maintainers = with maintainers; [ ]` syntax as that is most common
in nixpkgs, and remove the `nix-env` example which doesn't work like that anymore.
This commit is contained in:
Arnout Engelen 2022-12-03 10:04:15 +00:00
parent e76c78d206
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doc/stdenv/meta.chapter.md
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@ -11,58 +11,12 @@ meta = with lib; {
''; '';
homepage = "https://www.gnu.org/software/hello/manual/"; homepage = "https://www.gnu.org/software/hello/manual/";
license = licenses.gpl3Plus; license = licenses.gpl3Plus;
maintainers = [ maintainers.eelco ]; maintainers = with maintainers; [ eelco ];
platforms = platforms.all; platforms = platforms.all;
}; };
``` ```
Meta-attributes are not passed to the builder of the package. Thus, a change to a meta-attribute doesn’t trigger a recompilation of the package. The value of a meta-attribute must be a string. Meta-attributes are not passed to the builder of the package. Thus, a change to a meta-attribute doesn’t trigger a recompilation of the package.
The meta-attributes of a package can be queried from the command-line using `nix-env`:
```ShellSession
$ nix-env -qa hello --json
{
"hello": {
"meta": {
"description": "A program that produces a familiar, friendly greeting",
"homepage": "https://www.gnu.org/software/hello/manual/",
"license": {
"fullName": "GNU General Public License version 3 or later",
"shortName": "GPLv3+",
"url": "http://www.fsf.org/licensing/licenses/gpl.html"
},
"longDescription": "GNU Hello is a program that prints \"Hello, world!\" when you run it.\nIt is fully customizable.\n",
"maintainers": [
"Ludovic Court\u00e8s <ludo@gnu.org>"
],
"platforms": [
"i686-linux",
"x86_64-linux",
"armv5tel-linux",
"armv7l-linux",
"mips32-linux",
"x86_64-darwin",
"i686-cygwin",
"i686-freebsd13",
"x86_64-freebsd13",
"i686-openbsd",
"x86_64-openbsd"
],
"position": "/home/user/dev/nixpkgs/pkgs/applications/misc/hello/default.nix:14"
},
"name": "hello-2.9",
"system": "x86_64-linux"
}
}
```
`nix-env` knows about the `description` field specifically:
```ShellSession
$ nix-env -qa hello --description
hello-2.3 A program that produces a familiar, friendly greeting
```
## Standard meta-attributes {#sec-standard-meta-attributes} ## Standard meta-attributes {#sec-standard-meta-attributes}