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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
Pierre-Yves David - - Load All Authors

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test-journal.t
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Tests for the journal extension; records bookmark locations.
$ cat >> testmocks.py << EOF
> # mock out util.getuser() and util.makedate() to supply testable values
> import os
> from mercurial import util
> def mockgetuser():
> return 'foobar'
>
> def mockmakedate():
> filename = os.path.join(os.environ['TESTTMP'], 'testtime')
> try:
> with open(filename, 'rb') as timef:
> time = float(timef.read()) + 1
> except IOError:
> time = 0.0
> with open(filename, 'wb') as timef:
> timef.write(str(time))
> return (time, 0)
>
> util.getuser = mockgetuser
> util.makedate = mockmakedate
> EOF
$ cat >> $HGRCPATH << EOF
> [extensions]
> journal=
> testmocks=`pwd`/testmocks.py
> EOF
Setup repo
$ hg init repo
$ cd repo
Test empty journal
$ hg journal
previous locations of '.':
no recorded locations
$ hg journal foo
previous locations of 'foo':
no recorded locations
Test that working copy changes are tracked
$ echo a > a
$ hg commit -Aqm a
$ hg journal
previous locations of '.':
cb9a9f314b8b commit -Aqm a
$ echo b > a
$ hg commit -Aqm b
$ hg journal
previous locations of '.':
1e6c11564562 commit -Aqm b
cb9a9f314b8b commit -Aqm a
$ hg up 0
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ hg journal
previous locations of '.':
cb9a9f314b8b up 0
1e6c11564562 commit -Aqm b
cb9a9f314b8b commit -Aqm a
Test that bookmarks are tracked
$ hg book -r tip bar
$ hg journal bar
previous locations of 'bar':
1e6c11564562 book -r tip bar
$ hg book -f bar
$ hg journal bar
previous locations of 'bar':
cb9a9f314b8b book -f bar
1e6c11564562 book -r tip bar
$ hg up
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
updating bookmark bar
$ hg journal bar
previous locations of 'bar':
1e6c11564562 up
cb9a9f314b8b book -f bar
1e6c11564562 book -r tip bar
Test that bookmarks and working copy tracking is not mixed
$ hg journal
previous locations of '.':
1e6c11564562 up
cb9a9f314b8b up 0
1e6c11564562 commit -Aqm b
cb9a9f314b8b commit -Aqm a
Test that you can list all entries as well as limit the list or filter on them
$ hg book -r tip baz
$ hg journal --all
previous locations of the working copy and bookmarks:
1e6c11564562 baz book -r tip baz
1e6c11564562 bar up
1e6c11564562 . up
cb9a9f314b8b bar book -f bar
1e6c11564562 bar book -r tip bar
cb9a9f314b8b . up 0
1e6c11564562 . commit -Aqm b
cb9a9f314b8b . commit -Aqm a
$ hg journal --limit 2
previous locations of '.':
1e6c11564562 up
cb9a9f314b8b up 0
$ hg journal bar
previous locations of 'bar':
1e6c11564562 up
cb9a9f314b8b book -f bar
1e6c11564562 book -r tip bar
$ hg journal foo
previous locations of 'foo':
no recorded locations
$ hg journal .
previous locations of '.':
1e6c11564562 up
cb9a9f314b8b up 0
1e6c11564562 commit -Aqm b
cb9a9f314b8b commit -Aqm a
$ hg journal "re:ba."
previous locations of 're:ba.':
1e6c11564562 baz book -r tip baz
1e6c11564562 bar up
cb9a9f314b8b bar book -f bar
1e6c11564562 bar book -r tip bar
Test that verbose, JSON, template and commit output work
$ hg journal --verbose --all
previous locations of the working copy and bookmarks:
000000000000 -> 1e6c11564562 foobar baz 1970-01-01 00:00 +0000 book -r tip baz
cb9a9f314b8b -> 1e6c11564562 foobar bar 1970-01-01 00:00 +0000 up
cb9a9f314b8b -> 1e6c11564562 foobar . 1970-01-01 00:00 +0000 up
1e6c11564562 -> cb9a9f314b8b foobar bar 1970-01-01 00:00 +0000 book -f bar
000000000000 -> 1e6c11564562 foobar bar 1970-01-01 00:00 +0000 book -r tip bar
1e6c11564562 -> cb9a9f314b8b foobar . 1970-01-01 00:00 +0000 up 0
cb9a9f314b8b -> 1e6c11564562 foobar . 1970-01-01 00:00 +0000 commit -Aqm b
000000000000 -> cb9a9f314b8b foobar . 1970-01-01 00:00 +0000 commit -Aqm a
$ hg journal --verbose -Tjson
[
{
"command": "up",
"date": [5.0, 0],
"name": ".",
"newhashes": ["1e6c11564562b4ed919baca798bc4338bd299d6a"],
"oldhashes": ["cb9a9f314b8b07ba71012fcdbc544b5a4d82ff5b"],
"user": "foobar"
},
{
"command": "up 0",
"date": [2.0, 0],
"name": ".",
"newhashes": ["cb9a9f314b8b07ba71012fcdbc544b5a4d82ff5b"],
"oldhashes": ["1e6c11564562b4ed919baca798bc4338bd299d6a"],
"user": "foobar"
},
{
"command": "commit -Aqm b",
"date": [1.0, 0],
"name": ".",
"newhashes": ["1e6c11564562b4ed919baca798bc4338bd299d6a"],
"oldhashes": ["cb9a9f314b8b07ba71012fcdbc544b5a4d82ff5b"],
"user": "foobar"
},
{
"command": "commit -Aqm a",
"date": [0.0, 0],
"name": ".",
"newhashes": ["cb9a9f314b8b07ba71012fcdbc544b5a4d82ff5b"],
"oldhashes": ["0000000000000000000000000000000000000000"],
"user": "foobar"
}
]
$ cat <<EOF >> $HGRCPATH
> [templates]
> j = "{oldhashes % '{node|upper}'} -> {newhashes % '{node|upper}'}
> - user: {user}
> - command: {command}
> - date: {date|rfc3339date}
> - newhashes: {newhashes}
> - oldhashes: {oldhashes}
> "
> EOF
$ hg journal -Tj -l1
previous locations of '.':
CB9A9F314B8B07BA71012FCDBC544B5A4D82FF5B -> 1E6C11564562B4ED919BACA798BC4338BD299D6A
- user: foobar
- command: up
- date: 1970-01-01T00:00:05+00:00
- newhashes: 1e6c11564562b4ed919baca798bc4338bd299d6a
- oldhashes: cb9a9f314b8b07ba71012fcdbc544b5a4d82ff5b
$ hg journal --commit
previous locations of '.':
1e6c11564562 up
changeset: 1:1e6c11564562
bookmark: bar
bookmark: baz
tag: tip
user: test
date: Thu Jan 01 00:00:00 1970 +0000
summary: b
cb9a9f314b8b up 0
changeset: 0:cb9a9f314b8b
user: test
date: Thu Jan 01 00:00:00 1970 +0000
summary: a
1e6c11564562 commit -Aqm b
changeset: 1:1e6c11564562
bookmark: bar
bookmark: baz
tag: tip
user: test
date: Thu Jan 01 00:00:00 1970 +0000
summary: b
cb9a9f314b8b commit -Aqm a
changeset: 0:cb9a9f314b8b
user: test
date: Thu Jan 01 00:00:00 1970 +0000
summary: a
Test for behaviour on unexpected storage version information
$ printf '42\0' > .hg/namejournal
$ hg journal
previous locations of '.':
abort: unknown journal file version '42'
[255]
$ hg book -r tip doomed
unsupported journal file version '42'