( )⚙ D2471 debugcommands: support for triggering push protocol

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debugcommands: support for triggering push protocol
ClosedPublic

Authored by indygreg on Feb 26 2018, 8:59 PM.

Details

Summary

The mechanism for pushing to a remote is a bit more complicated
than other commands. On SSH, we wait for a positive reply from
the server before we start sending the bundle payload.

This commit adds a mechanism to the "command" action in
hg debugwireproto to trigger the "push protocol" and to
specify a file whose contents should be submitted as the command
payload.

With this new feature, we implement a handful of tests for the
"unbundle" command. We try to cover various server failures and
hook/output scenarios so protocol behavior is as comprehensively
tested as possible. Even with so much test output, we only cover
bundle1 with Python hooks. There's still a lot of test coverage
that needs to be implemented. But this is certainly a good start.

Because there are so many new tests, we split these tests into their
own test file.

In order to make output deterministic, we need to disable the
doublepipe primitive. We add an option to hg debugwireproto
to do that. Because something in the bowels of the peer does a
read of stderr, we still capture read I/O from stderr. So there
is test coverage of what the server emits.

The tests around I/O capture some wonkiness. For example,
interleaved ui.write() and ui.write_err() calls are emitted in
order. However, (presumably due to buffering), print() to
sys.stdout and sys.stderr aren't in order.

We currently only test bundle1 because bundle2 is substantially
harder to test because it is more complicated (the server responds
with a stream containing a bundle2 instead of a frame).

Diff Detail

Repository
rHG Mercurial
Lint
Automatic diff as part of commit; lint not applicable.
Unit
Automatic diff as part of commit; unit tests not applicable.

Event Timeline

indygreg created this revision.Feb 26 2018, 8:59 PM
indygreg updated this revision to Diff 6151.Feb 26 2018, 9:04 PM
indygreg updated this revision to Diff 6256.Mar 1 2018, 11:30 AM
indygreg updated this revision to Diff 6259.Mar 1 2018, 11:44 AM
durin42 accepted this revision.Mar 1 2018, 4:41 PM
This revision is now accepted and ready to land.Mar 1 2018, 4:41 PM
This revision was automatically updated to reflect the committed changes.