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Print license information on '--xml --meta'

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The nixpkgs manual prescribes the use of values from stdenv.lib.licenses
for the meta.license attribute. Those values are attribute sets and
currently skipped when running nix-env with '--xml --meta'. This has the
consequence that also nixpkgs-lint will report missing licenses.

With this commit nix-env with '--xml --meta' will print all attributes
of an attribute set that are of type tString. For example the output for
the package nixpkgs.hello is

    <meta name="license" type="strings">
      <string type="url" value="http://spdx.org/licenses/GPL-3.0+" />
      <string type="shortName" value="gpl3Plus" />
      <string type="fullName" value="GNU General Public License v3.0 or later" />
      <string type="spdxId" value="GPL-3.0+" />
    </meta>

This commit fixes nixpkgs-lint, too.
This commit is contained in:
Pascal Wittmann 2015-11-21 11:43:44 +01:00
parent b9b7bb1806
commit 4921223160
1 changed files with 12 additions and 0 deletions
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12
src/nix-env/nix-env.cc
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@ -1140,6 +1140,18 @@ static void opQuery(Globals & globals, Strings opFlags, Strings opArgs)
attrs3["value"] = v->listElems()[j]->string.s;
xml.writeEmptyElement("string", attrs3);
}
} else if (v->type == tAttrs) {
attrs2["type"] = "strings";
XMLOpenElement m(xml, "meta", attrs2);
Bindings & attrs = *v->attrs;
for (auto &i : attrs) {
Attr & a(*attrs.find(i.name));
if(a.value->type != tString) continue;
XMLAttrs attrs3;
attrs3["type"] = i.name;
attrs3["value"] = a.value->string.s;
xml.writeEmptyElement("string", attrs3);
}
}
}
}