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sshpeer: initial definition and implementation of new SSH protocol...
sshpeer: initial definition and implementation of new SSH protocol The existing SSH protocol has several design flaws. Future commits will elaborate on these flaws as new features are introduced to combat these flaws. For now, hopefully you can take me for my word that a ground up rewrite of the SSH protocol is needed. This commit lays the foundation for a new SSH protocol by defining a mechanism to upgrade the SSH transport channel away from the default (version 1) protocol to something modern (which we'll call "version 2" for now). This upgrade process is detailed in the internals documentation for the wire protocol. The gist of it is the client sends a request line preceding the "hello" command/line which basically says "I'm requesting an upgrade: here's what I support." If the server recognizes that line, it processes the upgrade request and the transport channel is switched to use the new version of the protocol. If not, it sends an empty response, which is how all Mercurial SSH servers from the beginning of time reacted to unknown commands. The upgrade request is effectively ignored and the client continues to use the existing version of the protocol as if nothing happened. The new version of the SSH protocol is completely identical to version 1 aside from the upgrade dance and the bytes that follow. The immediate bytes that follow the protocol switch are defined to be a length framed "capabilities: " line containing the remote's advertised capabilities. In reality, this looks very similar to what the "hello" response would look like. But it will evolve quickly. The methodology by which the protocol will evolve is important. I'm not going to introduce the new protocol all at once. That would likely lead to endless bike shedding and forward progress would stall. Instead, I intend to tricle out new features and diversions from the existing protocol in small, incremental changes. To support the gradual evolution of the protocol, the on-the-wire advertised protocol name contains an "exp" to denote "experimental" and a 4 digit field to capture the sub-version of the protocol. Whenever we make a BC change to the wire protocol, we can increment this version and lock out all older clients because it will appear as a completely different protocol version. This means we can incur as many breaking changes as we want. We don't have to commit to supporting any one feature or idea for a long period of time. We can even evolve the handshake mechanism, because that is defined as being an implementation detail of the negotiated protocol version! Hopefully this lowers the barrier to accepting changes to the protocol and for experimenting with "radical" ideas during its development. In core, sshpeer received most of the attention. We haven't even implemented the server bits for the new protocol in core yet. Instead, we add very primitive support to our test server, mainly just to exercise the added code paths in sshpeer. Differential Revision: https://phab.mercurial-scm.org/D2061 # no-check-commit because of required foo_bar naming
Augie Fackler - - Load All Authors

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test-contrib-check-commit.t
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Test the 'check-commit' script
==============================
A fine patch:
$ cat > patch-with-long-header.diff << EOF
> # HG changeset patch
> # User timeless <timeless@mozdev.org>
> # Date 1448911706 0
> # Mon Nov 30 19:28:26 2015 +0000
> # Node ID c41cb6d2b7dbd62b1033727f8606b8c09fc4aa88
> # Parent 42aa0e570eaa364a622bc4443b0bcb79b1100a58
> # ClownJoke This is a veryly long header that should not be warned about because its not the description
> bundle2: use Oxford comma (issue123) (BC)
>
> diff --git a/hgext/transplant.py b/hgext/transplant.py
> --- a/hgext/transplant.py
> +++ b/hgext/transplant.py
> @@ -599,7 +599,7 @@
> return
> if not (opts.get('source') or revs or
> opts.get('merge') or opts.get('branch')):
> - raise error.Abort(_('no source URL, branch revision or revision '
> + raise error.Abort(_('no source URL, branch revision, or revision '
> 'list provided'))
> if opts.get('all'):
>
> + def blahblah(x):
> + pass
> EOF
$ cat patch-with-long-header.diff | $TESTDIR/../contrib/check-commit
This would normally be against the rules, but it's okay because that's
what tagging and signing looks like:
$ cat > creates-a-tag.diff << EOF
> # HG changeset patch
> # User Augie Fackler <raf@durin42.com>
> # Date 1484787778 18000
> # Wed Jan 18 20:02:58 2017 -0500
> # Branch stable
> # Node ID c177635e4acf52923bc3aa9f72a5b1ad1197b173
> # Parent a1dd2c0c479e0550040542e392e87bc91262517e
> Added tag 4.1-rc for changeset a1dd2c0c479e
>
> diff --git a/.hgtags b/.hgtags
> --- a/.hgtags
> +++ b/.hgtags
> @@ -150,3 +150,4 @@ 438173c415874f6ac653efc1099dec9c9150e90f
> eab27446995210c334c3d06f1a659e3b9b5da769 4.0
> b3b1ae98f6a0e14c1e1ba806a6c18e193b6dae5c 4.0.1
> e69874dc1f4e142746ff3df91e678a09c6fc208c 4.0.2
> +a1dd2c0c479e0550040542e392e87bc91262517e 4.1-rc
> EOF
$ $TESTDIR/../contrib/check-commit < creates-a-tag.diff
A patch with lots of errors:
$ cat > patch-with-long-header.diff << EOF
> # HG changeset patch
> # User timeless
> # Date 1448911706 0
> # Mon Nov 30 19:28:26 2015 +0000
> # Node ID c41cb6d2b7dbd62b1033727f8606b8c09fc4aa88
> # Parent 42aa0e570eaa364a622bc4443b0bcb79b1100a58
> # ClownJoke This is a veryly long header that should not be warned about because its not the description
> transplant/foo: this summary is way too long use Oxford comma (bc) (bug123) (issue 244)
>
> diff --git a/hgext/transplant.py b/hgext/transplant.py
> --- a/hgext/transplant.py
> +++ b/hgext/transplant.py
> @@ -599,7 +599,7 @@
> return
> if not (opts.get('source') or revs or
> opts.get('merge') or opts.get('branch')):
> - raise error.Abort(_('no source URL, branch revision or revision '
> + raise error.Abort(_('no source URL, branch revision, or revision '
> 'list provided'))
> if opts.get('all'):
> EOF
$ cat patch-with-long-header.diff | $TESTDIR/../contrib/check-commit
1: username is not an email address
# User timeless
7: summary keyword should be most user-relevant one-word command or topic
transplant/foo: this summary is way too long use Oxford comma (bc) (bug123) (issue 244)
7: (BC) needs to be uppercase
transplant/foo: this summary is way too long use Oxford comma (bc) (bug123) (issue 244)
7: use (issueDDDD) instead of bug
transplant/foo: this summary is way too long use Oxford comma (bc) (bug123) (issue 244)
7: no space allowed between issue and number
transplant/foo: this summary is way too long use Oxford comma (bc) (bug123) (issue 244)
7: summary line too long (limit is 78)
transplant/foo: this summary is way too long use Oxford comma (bc) (bug123) (issue 244)
[1]
A patch with other errors:
$ cat > patch-with-long-header.diff << EOF
> # HG changeset patch
> # User timeless
> # Date 1448911706 0
> # Mon Nov 30 19:28:26 2015 +0000
> # Node ID c41cb6d2b7dbd62b1033727f8606b8c09fc4aa88
> # Parent 42aa0e570eaa364a622bc4443b0bcb79b1100a58
> # ClownJoke This is a veryly long header that should not be warned about because its not the description
> This has no topic and ends with a period.
>
> diff --git a/hgext/transplant.py b/hgext/transplant.py
> --- a/hgext/transplant.py
> +++ b/hgext/transplant.py
> @@ -599,7 +599,7 @@
> if opts.get('all'):
>
>
> +
> + some = otherjunk
> +
> +
> + def blah_blah(x):
> + pass
> +
>
> EOF
$ cat patch-with-long-header.diff | $TESTDIR/../contrib/check-commit
1: username is not an email address
# User timeless
7: don't capitalize summary lines
This has no topic and ends with a period.
7: summary line doesn't start with 'topic: '
This has no topic and ends with a period.
7: don't add trailing period on summary line
This has no topic and ends with a period.
19: adds double empty line
+
20: adds a function with foo_bar naming
+ def blah_blah(x):
23: adds double empty line
+
[1]