On 24/09/2018 14:01, Boris Zbarsky wrote:
On 9/24/18 8:43 AM, James Graham wrote:
Thanks to great work by Outreachy intern Ahilya Sinha (:Cactusmachete) [1], the in-tree wpt MANIFEST.json files are no longer used and will soon be removed.

That's great news.  :)

Invoking `mach wpt` will now cause a recent wpt manifest to be downloaded from Taskcluster into the objdir (if not already present) and updated to match the source tree.

Just to make sure I understand, what happens in an offline scenario? Does it basically "update" from an empty starting manifest or something else?

Yes, that. Nothing is supposed to break if you're entirely offline, but a full manifest update is rather slow (technical details: because all the metadata is extracted from the test files, and we currently parse them using a slow-but-correct Python HTML parser. Switching to html5ever or similar is the most obvious path to fix this, but comes with additional challenges in terms of workflow and compatibility).
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