Proposal : forbid subfolders in GTFS files

[Thibaut Barrère]

Hello,

While working on GTFS aggregation (~400 files), I found that ~5% of them had data in subfolders, which make it harder to ingest them.

At https://github.com/google/transit/issues/377 I have opened a bit of discussion around that, and the feedback has been positive, so I created this PR: https://github.com/google/transit/pull/379

Posting this here after Leonard Ehrenfried explained that it must be done that way for votes to happen.

Thanks,

-- Thibaut

[Elias Gino Cripotos]

Thank you for posting this here Thibaut! 

[Mark Stosberg]

I'm in favor of this proposal. What I've been doing is to pre-filter all GTFS files I ingest to unpack them and then re-zip them flattened. 

For `zip` CLI tool, there's a `--junk-paths` flag that does this. Tools and docs that help with creating GTFS files could easily use tooling like that make sure the zip file structure is flattened.