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epriestley 8840f60218 Enable Mercurial reads and writes over SSH
Summary:
Ref T2230. This is substantially more complicated than Git, but mostly because Mercurial's protocol is a like 50 ad-hoc extensions cobbled together. Because we must decode protocol frames in order to determine if a request is read or write, 90% of this is implementing a stream parser for the protocol.

Mercurial's own parser is simpler, but relies on blocking reads. Since we don't even have methods for blocking reads right now and keeping the whole thing non-blocking is conceptually better, I made the parser nonblocking. It ends up being a lot of stuff. I made an effort to cover it reasonably well with unit tests, and to make sure we fail closed (i.e., reject requests) if there are any parts of the protocol I got wrong.

A lot of the complexity is sharable with the HTTP stuff, so it ends up being not-so-bad, just very hard to verify by inspection as clearly correct.

Test Plan:
  - Ran `hg clone` over SSH.
  - Ran `hg fetch` over SSH.
  - Ran `hg push` over SSH, to a read-only repo (error) and a read-write repo (success).

Reviewers: btrahan, asherkin

Reviewed By: btrahan

CC: aran

Maniphest Tasks: T2230

Differential Revision: https://secure.phabricator.com/D7553
2013-11-11 12:18:27 -08:00
bin Prepare to route VCS connections through SSH 2013-10-29 15:32:40 -07:00
conf Enable "SSH Keys" auth panel unconditionally 2013-10-29 15:32:41 -07:00
externals Update WePay API to HEAD 2013-11-06 14:05:29 -08:00
resources Implemented support for build logs 2013-11-08 18:15:07 -08:00
scripts Enable Mercurial reads and writes over SSH 2013-11-11 12:18:27 -08:00
src Enable Mercurial reads and writes over SSH 2013-11-11 12:18:27 -08:00
support Remove spurious "+x" from files that shouldn't have it 2013-10-05 05:18:17 -07:00
webroot Replace some hsprintf() by phutil_tag() 2013-11-11 09:23:23 -08:00
.arcconfig Use JsShrink if jsxmin is not available 2013-05-18 17:04:22 -07:00
.divinerconfig Centralize rendering of application mail bodies 2012-07-16 19:01:43 -07:00
.editorconfig Specify config for text editors 2012-11-03 22:34:44 -07:00
.gitignore Add src/extensions/ to .gitignore 2013-08-14 19:14:23 -07:00
LICENSE Delete license headers from files 2012-11-05 11:16:51 -08:00
NOTICE Increment year. 2013-01-03 05:45:08 -08:00
README Update README 2013-07-03 12:08:37 -07:00

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