Docs do not mention third_party requirements for a license

[endobson]

I added a directory in my toplevel called third_party, and when building a rule within it I got an error:

ERROR: /Users/endobson/tmp/grpc-bazel/third_party/openssl/BUILD:78:1: third-party rule '//third_party/openssl:libssl-deb' lacks a license declaration with one of the following types: notice, reciprocal, permissive, restricted, unencumbered, by_exception_only.

Searching for third_party in the bazel docs does not turn up anything about this restriction: http://bazel.io/search.html?q=third_party

[kchodorow]

To work around this, you can add a licenses(["notice"]) line to your BUILD files in the third_party directory.

[kamalmarhubi]

Is this restriction going to be relaxed? It seems a bit inconsistent to enforce this for third_party but not for things like new_http_archive.

[damienmg]

Yes AFAICT it should be relaxed and replaced by the constraint mechanism.

On Fri, Nov 27, 2015, 8:52 PM Kamal Marhubi notifications@github.com
wrote:

Is this restriction going to be relaxed? It seems a bit inconsistent to
enforce this for third_party but not for things like new_http_archive.

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Reply to this email directly or view it on GitHub
#642 (comment).

[trainman419]

+1. I ran into this today and was not able to find any documentation about which licenses are available or what the license() command does.

[davidzchen]

Here is the documentation on licenses: http://bazel.io/docs/be/functions.html#licenses. I agree that the documentation should be fleshed out a bit more since it doesn't really mention which license-type strings are available.

[kchodorow]

I added some documentation here: https://github.com/bazelbuild/bazel/blob/master/src/main/java/com/google/devtools/build/lib/packages/PackageFactory.java#L722-L741, which I incorrectly thought would be included in the generated docs. We should move it somewhere else so it will show up in the documentation.

[kchodorow]

Eventually... it needs to be moved to a different file.

[trainman419]

The existing documentation describes what, but not why.

From some digging, it appears that licenses somehow interacts with the --check_licenses command-line flag. Is there any documentation describing this flag? It would be good if the documentation for licenses linked to that documentation.