allow any s3fs connection args

[aisch]

so we can use boto to deduce all this from env rather than hardcoding.

should still work w/ previous calls except that: cxn failure due to missing creds is delayed to first S3FS._s3conn, if you like i can update pr to try cxn once in S3FS.__init__ and convert missing creds error to CreateFailedError there.

closes #211

[aisch]

@lurch any interest in merging this pr?

[lurch]

I'm afraid I've never even looked at any of the S3FS code - that's more @willmcgugan 's or @rfk 's area.

[aisch]

@willmcgugan @rfk do these S3FS changes look ok to merge?

[jimbocoder]

We'd love to see this merged if there are no blockers! Looks good to me, but I don't maintain this project :)

[lurch]

Well I've never used any S3 stuff, so I haven't tested this PR. And even though @willmcgugan or @rfk haven't provided any feedback, this change looks okay from a quick glance, so I'll go ahead and merge it anyway, and hope it doesn't break anything ;-)

[jimbocoder]

We've taken this all the way from dev through to production and it's working great for 3 days now without issue.

@lurch I'm curious about a practical aspect. I notice this change is not in pypi even though it's present in the master branch here. Is there some periodic update to pypi for this project, or a testing process that needs to happen first, or what? Currently we've forked this repo, but usually vanilla pypi would be way nicer :)

Thanks for merging this!

[lurch]

Thanks for the positive feedback 👍

pypi releases are entirely managed by @willmcgugan (the creator and owner of this project), and out of my hands.

[aisch]

@jimbocoder @lurch thx for getting this merged 🎉

[jimbocoder]

@willmcgugan After a couple months now, we've put tens of millions of files through this change, with no adverse effects to report! Would love to see this one make it into the pypi index, so we can "unfork" the pypi release! Thanks!