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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
Saurabh Singh - - Load All Authors

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r34793:3b4b3813 default
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test-hgweb-annotate-whitespace.t
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#require serve
Create a repo with whitespace only changes
$ hg init repo-with-whitespace
$ cd repo-with-whitespace
$ cat > foo << EOF
> line 0
> line 1
> line 2
> line 3
> EOF
$ hg -q commit -A -m 'commit 0'
$ cat > foo << EOF
> line 0
> line 1 modified by 1
> line 2
> line 3
> EOF
$ hg commit -m 'commit 1'
$ cat > foo << EOF
> line 0
> line 1 modified by 1
> line 2
> line 3
> EOF
$ hg commit -m 'commit 2 (leading whitespace on line 2)'
$ cat > foo << EOF
> line 0
> line 1 modified by 1
> line 2
> EOF
Need to use printf to avoid check-code complaining about trailing whitespace.
$ printf 'line 3 \n' >> foo
$ hg commit -m 'commit 3 (trailing whitespace on line 3)'
$ cat > foo << EOF
> line 0
> line 1 modified by 1
> line 2
> EOF
$ printf 'line 3 \n' >> foo
$ hg commit -m 'commit 4 (intra whitespace on line 0)'
$ cat > foo << EOF
> line 0
>
> line 1 modified by 1
> line 2
> EOF
$ printf 'line 3 \n' >> foo
$ hg commit -m 'commit 5 (add blank line between line 0 and 1)'
$ cat > foo << EOF
> line 0
>
>
> line 1 modified by 1
> line 2
> EOF
$ printf 'line 3 \n' >> foo
$ hg commit -m 'commit 6 (add another blank line between line 0 and 1)'
$ hg log -G -T '{rev}:{node|short} {desc}'
@ 6:9d1b2c7db017 commit 6 (add another blank line between line 0 and 1)
|
o 5:400ef1d40470 commit 5 (add blank line between line 0 and 1)
|
o 4:08adbe269f24 commit 4 (intra whitespace on line 0)
|
o 3:dcb62cfbfc9b commit 3 (trailing whitespace on line 3)
|
o 2:6bdb694e7b8c commit 2 (leading whitespace on line 2)
|
o 1:23e1e37387dc commit 1
|
o 0:b9c578134d72 commit 0
$ hg serve -p $HGPORT -d --pid-file hg.pid
$ cat hg.pid >> $DAEMON_PIDS
$ hg serve --config annotate.ignorews=true -p $HGPORT1 -d --pid-file hg.pid
$ cat hg.pid >> $DAEMON_PIDS
$ cd ..
Annotate works
$ get-with-headers.py --json $LOCALIP:$HGPORT 'json-annotate/9d1b2c7db017/foo'
200 Script output follows
{
"abspath": "foo",
"annotate": [
{
"abspath": "foo",
"author": "test",
"desc": "commit 4 (intra whitespace on line 0)",
"line": "line 0\n",
"lineno": 1,
"node": "08adbe269f24cf22d975eadeec16790c5b22f558",
"revdate": [
0.0,
0
],
"targetline": 1
},
{
"abspath": "foo",
"author": "test",
"desc": "commit 5 (add blank line between line 0 and 1)",
"line": "\n",
"lineno": 2,
"node": "400ef1d404706cfb48afd2b78ce6addf641ced25",
"revdate": [
0.0,
0
],
"targetline": 2
},
{
"abspath": "foo",
"author": "test",
"desc": "commit 6 (add another blank line between line 0 and 1)",
"line": "\n",
"lineno": 3,
"node": "9d1b2c7db0175870a950f8c48c9c4ead1058f2c5",
"revdate": [
0.0,
0
],
"targetline": 3
},
{
"abspath": "foo",
"author": "test",
"desc": "commit 1",
"line": "line 1 modified by 1\n",
"lineno": 4,
"node": "23e1e37387dcfca4c0ed0cc568d1e4b9bfed241a",
"revdate": [
0.0,
0
],
"targetline": 2
},
{
"abspath": "foo",
"author": "test",
"desc": "commit 2 (leading whitespace on line 2)",
"line": " line 2\n",
"lineno": 5,
"node": "6bdb694e7b8cebb68d5b6b27b4bcc2a49d62c602",
"revdate": [
0.0,
0
],
"targetline": 3
},
{
"abspath": "foo",
"author": "test",
"desc": "commit 3 (trailing whitespace on line 3)",
"line": "line 3 \n",
"lineno": 6,
"node": "dcb62cfbfc9b3ab995a5cbbaff6e1971c3e4f865",
"revdate": [
0.0,
0
],
"targetline": 4
}
],
"author": "test",
"children": [],
"date": [
0.0,
0
],
"desc": "commit 6 (add another blank line between line 0 and 1)",
"node": "9d1b2c7db0175870a950f8c48c9c4ead1058f2c5",
"parents": [
"400ef1d404706cfb48afd2b78ce6addf641ced25"
],
"permissions": ""
}
annotate.ignorews=1 config option is honored
$ get-with-headers.py --json $LOCALIP:$HGPORT1 'json-annotate/9d1b2c7db017/foo'
200 Script output follows
{
"abspath": "foo",
"annotate": [
{
"abspath": "foo",
"author": "test",
"desc": "commit 0",
"line": "line 0\n",
"lineno": 1,
"node": "b9c578134d72b3a9d26afde8ddd76c0a93c5adbc",
"revdate": [
0.0,
0
],
"targetline": 1
},
{
"abspath": "foo",
"author": "test",
"desc": "commit 5 (add blank line between line 0 and 1)",
"line": "\n",
"lineno": 2,
"node": "400ef1d404706cfb48afd2b78ce6addf641ced25",
"revdate": [
0.0,
0
],
"targetline": 2
},
{
"abspath": "foo",
"author": "test",
"desc": "commit 6 (add another blank line between line 0 and 1)",
"line": "\n",
"lineno": 3,
"node": "9d1b2c7db0175870a950f8c48c9c4ead1058f2c5",
"revdate": [
0.0,
0
],
"targetline": 3
},
{
"abspath": "foo",
"author": "test",
"desc": "commit 1",
"line": "line 1 modified by 1\n",
"lineno": 4,
"node": "23e1e37387dcfca4c0ed0cc568d1e4b9bfed241a",
"revdate": [
0.0,
0
],
"targetline": 2
},
{
"abspath": "foo",
"author": "test",
"desc": "commit 0",
"line": " line 2\n",
"lineno": 5,
"node": "b9c578134d72b3a9d26afde8ddd76c0a93c5adbc",
"revdate": [
0.0,
0
],
"targetline": 3
},
{
"abspath": "foo",
"author": "test",
"desc": "commit 0",
"line": "line 3 \n",
"lineno": 6,
"node": "b9c578134d72b3a9d26afde8ddd76c0a93c5adbc",
"revdate": [
0.0,
0
],
"targetline": 4
}
],
"author": "test",
"children": [],
"date": [
0.0,
0
],
"desc": "commit 6 (add another blank line between line 0 and 1)",
"node": "9d1b2c7db0175870a950f8c48c9c4ead1058f2c5",
"parents": [
"400ef1d404706cfb48afd2b78ce6addf641ced25"
],
"permissions": ""
}
ignorews=1 query string argument enables whitespace skipping
$ get-with-headers.py --json $LOCALIP:$HGPORT 'json-annotate/9d1b2c7db017/foo?ignorews=1'
200 Script output follows
{
"abspath": "foo",
"annotate": [
{
"abspath": "foo",
"author": "test",
"desc": "commit 0",
"line": "line 0\n",
"lineno": 1,
"node": "b9c578134d72b3a9d26afde8ddd76c0a93c5adbc",
"revdate": [
0.0,
0
],
"targetline": 1
},
{
"abspath": "foo",
"author": "test",
"desc": "commit 5 (add blank line between line 0 and 1)",
"line": "\n",
"lineno": 2,
"node": "400ef1d404706cfb48afd2b78ce6addf641ced25",
"revdate": [
0.0,
0
],
"targetline": 2
},
{
"abspath": "foo",
"author": "test",
"desc": "commit 6 (add another blank line between line 0 and 1)",
"line": "\n",
"lineno": 3,
"node": "9d1b2c7db0175870a950f8c48c9c4ead1058f2c5",
"revdate": [
0.0,
0
],
"targetline": 3
},
{
"abspath": "foo",
"author": "test",
"desc": "commit 1",
"line": "line 1 modified by 1\n",
"lineno": 4,
"node": "23e1e37387dcfca4c0ed0cc568d1e4b9bfed241a",
"revdate": [
0.0,
0
],
"targetline": 2
},
{
"abspath": "foo",
"author": "test",
"desc": "commit 0",
"line": " line 2\n",
"lineno": 5,
"node": "b9c578134d72b3a9d26afde8ddd76c0a93c5adbc",
"revdate": [
0.0,
0
],
"targetline": 3
},
{
"abspath": "foo",
"author": "test",
"desc": "commit 0",
"line": "line 3 \n",
"lineno": 6,
"node": "b9c578134d72b3a9d26afde8ddd76c0a93c5adbc",
"revdate": [
0.0,
0
],
"targetline": 4
}
],
"author": "test",
"children": [],
"date": [
0.0,
0
],
"desc": "commit 6 (add another blank line between line 0 and 1)",
"node": "9d1b2c7db0175870a950f8c48c9c4ead1058f2c5",
"parents": [
"400ef1d404706cfb48afd2b78ce6addf641ced25"
],
"permissions": ""
}
ignorews=0 query string argument disables when config defaults to enabled
$ get-with-headers.py --json $LOCALIP:$HGPORT1 'json-annotate/9d1b2c7db017/foo?ignorews=0'
200 Script output follows
{
"abspath": "foo",
"annotate": [
{
"abspath": "foo",
"author": "test",
"desc": "commit 4 (intra whitespace on line 0)",
"line": "line 0\n",
"lineno": 1,
"node": "08adbe269f24cf22d975eadeec16790c5b22f558",
"revdate": [
0.0,
0
],
"targetline": 1
},
{
"abspath": "foo",
"author": "test",
"desc": "commit 5 (add blank line between line 0 and 1)",
"line": "\n",
"lineno": 2,
"node": "400ef1d404706cfb48afd2b78ce6addf641ced25",
"revdate": [
0.0,
0
],
"targetline": 2
},
{
"abspath": "foo",
"author": "test",
"desc": "commit 6 (add another blank line between line 0 and 1)",
"line": "\n",
"lineno": 3,
"node": "9d1b2c7db0175870a950f8c48c9c4ead1058f2c5",
"revdate": [
0.0,
0
],
"targetline": 3
},
{
"abspath": "foo",
"author": "test",
"desc": "commit 1",
"line": "line 1 modified by 1\n",
"lineno": 4,
"node": "23e1e37387dcfca4c0ed0cc568d1e4b9bfed241a",
"revdate": [
0.0,
0
],
"targetline": 2
},
{
"abspath": "foo",
"author": "test",
"desc": "commit 2 (leading whitespace on line 2)",
"line": " line 2\n",
"lineno": 5,
"node": "6bdb694e7b8cebb68d5b6b27b4bcc2a49d62c602",
"revdate": [
0.0,
0
],
"targetline": 3
},
{
"abspath": "foo",
"author": "test",
"desc": "commit 3 (trailing whitespace on line 3)",
"line": "line 3 \n",
"lineno": 6,
"node": "dcb62cfbfc9b3ab995a5cbbaff6e1971c3e4f865",
"revdate": [
0.0,
0
],
"targetline": 4
}
],
"author": "test",
"children": [],
"date": [
0.0,
0
],
"desc": "commit 6 (add another blank line between line 0 and 1)",
"node": "9d1b2c7db0175870a950f8c48c9c4ead1058f2c5",
"parents": [
"400ef1d404706cfb48afd2b78ce6addf641ced25"
],
"permissions": ""
}
ignorewsamount=1 query string enables whitespace amount skipping
$ get-with-headers.py --json $LOCALIP:$HGPORT 'json-annotate/9d1b2c7db017/foo?ignorewsamount=1'
200 Script output follows
{
"abspath": "foo",
"annotate": [
{
"abspath": "foo",
"author": "test",
"desc": "commit 0",
"line": "line 0\n",
"lineno": 1,
"node": "b9c578134d72b3a9d26afde8ddd76c0a93c5adbc",
"revdate": [
0.0,
0
],
"targetline": 1
},
{
"abspath": "foo",
"author": "test",
"desc": "commit 5 (add blank line between line 0 and 1)",
"line": "\n",
"lineno": 2,
"node": "400ef1d404706cfb48afd2b78ce6addf641ced25",
"revdate": [
0.0,
0
],
"targetline": 2
},
{
"abspath": "foo",
"author": "test",
"desc": "commit 6 (add another blank line between line 0 and 1)",
"line": "\n",
"lineno": 3,
"node": "9d1b2c7db0175870a950f8c48c9c4ead1058f2c5",
"revdate": [
0.0,
0
],
"targetline": 3
},
{
"abspath": "foo",
"author": "test",
"desc": "commit 1",
"line": "line 1 modified by 1\n",
"lineno": 4,
"node": "23e1e37387dcfca4c0ed0cc568d1e4b9bfed241a",
"revdate": [
0.0,
0
],
"targetline": 2
},
{
"abspath": "foo",
"author": "test",
"desc": "commit 2 (leading whitespace on line 2)",
"line": " line 2\n",
"lineno": 5,
"node": "6bdb694e7b8cebb68d5b6b27b4bcc2a49d62c602",
"revdate": [
0.0,
0
],
"targetline": 3
},
{
"abspath": "foo",
"author": "test",
"desc": "commit 0",
"line": "line 3 \n",
"lineno": 6,
"node": "b9c578134d72b3a9d26afde8ddd76c0a93c5adbc",
"revdate": [
0.0,
0
],
"targetline": 4
}
],
"author": "test",
"children": [],
"date": [
0.0,
0
],
"desc": "commit 6 (add another blank line between line 0 and 1)",
"node": "9d1b2c7db0175870a950f8c48c9c4ead1058f2c5",
"parents": [
"400ef1d404706cfb48afd2b78ce6addf641ced25"
],
"permissions": ""
}
ignorewseol=1 query string enables whitespace end of line skipping
$ get-with-headers.py --json $LOCALIP:$HGPORT 'json-annotate/9d1b2c7db017/foo?ignorewseol=1'
200 Script output follows
{
"abspath": "foo",
"annotate": [
{
"abspath": "foo",
"author": "test",
"desc": "commit 4 (intra whitespace on line 0)",
"line": "line 0\n",
"lineno": 1,
"node": "08adbe269f24cf22d975eadeec16790c5b22f558",
"revdate": [
0.0,
0
],
"targetline": 1
},
{
"abspath": "foo",
"author": "test",
"desc": "commit 5 (add blank line between line 0 and 1)",
"line": "\n",
"lineno": 2,
"node": "400ef1d404706cfb48afd2b78ce6addf641ced25",
"revdate": [
0.0,
0
],
"targetline": 2
},
{
"abspath": "foo",
"author": "test",
"desc": "commit 6 (add another blank line between line 0 and 1)",
"line": "\n",
"lineno": 3,
"node": "9d1b2c7db0175870a950f8c48c9c4ead1058f2c5",
"revdate": [
0.0,
0
],
"targetline": 3
},
{
"abspath": "foo",
"author": "test",
"desc": "commit 1",
"line": "line 1 modified by 1\n",
"lineno": 4,
"node": "23e1e37387dcfca4c0ed0cc568d1e4b9bfed241a",
"revdate": [
0.0,
0
],
"targetline": 2
},
{
"abspath": "foo",
"author": "test",
"desc": "commit 2 (leading whitespace on line 2)",
"line": " line 2\n",
"lineno": 5,
"node": "6bdb694e7b8cebb68d5b6b27b4bcc2a49d62c602",
"revdate": [
0.0,
0
],
"targetline": 3
},
{
"abspath": "foo",
"author": "test",
"desc": "commit 0",
"line": "line 3 \n",
"lineno": 6,
"node": "b9c578134d72b3a9d26afde8ddd76c0a93c5adbc",
"revdate": [
0.0,
0
],
"targetline": 4
}
],
"author": "test",
"children": [],
"date": [
0.0,
0
],
"desc": "commit 6 (add another blank line between line 0 and 1)",
"node": "9d1b2c7db0175870a950f8c48c9c4ead1058f2c5",
"parents": [
"400ef1d404706cfb48afd2b78ce6addf641ced25"
],
"permissions": ""
}
ignoreblanklines=1 query string enables whitespace blank line skipping
$ get-with-headers.py --json $LOCALIP:$HGPORT 'json-annotate/9d1b2c7db017/foo?ignoreblanklines=1'
200 Script output follows
{
"abspath": "foo",
"annotate": [
{
"abspath": "foo",
"author": "test",
"desc": "commit 4 (intra whitespace on line 0)",
"line": "line 0\n",
"lineno": 1,
"node": "08adbe269f24cf22d975eadeec16790c5b22f558",
"revdate": [
0.0,
0
],
"targetline": 1
},
{
"abspath": "foo",
"author": "test",
"desc": "commit 5 (add blank line between line 0 and 1)",
"line": "\n",
"lineno": 2,
"node": "400ef1d404706cfb48afd2b78ce6addf641ced25",
"revdate": [
0.0,
0
],
"targetline": 2
},
{
"abspath": "foo",
"author": "test",
"desc": "commit 6 (add another blank line between line 0 and 1)",
"line": "\n",
"lineno": 3,
"node": "9d1b2c7db0175870a950f8c48c9c4ead1058f2c5",
"revdate": [
0.0,
0
],
"targetline": 3
},
{
"abspath": "foo",
"author": "test",
"desc": "commit 1",
"line": "line 1 modified by 1\n",
"lineno": 4,
"node": "23e1e37387dcfca4c0ed0cc568d1e4b9bfed241a",
"revdate": [
0.0,
0
],
"targetline": 2
},
{
"abspath": "foo",
"author": "test",
"desc": "commit 2 (leading whitespace on line 2)",
"line": " line 2\n",
"lineno": 5,
"node": "6bdb694e7b8cebb68d5b6b27b4bcc2a49d62c602",
"revdate": [
0.0,
0
],
"targetline": 3
},
{
"abspath": "foo",
"author": "test",
"desc": "commit 3 (trailing whitespace on line 3)",
"line": "line 3 \n",
"lineno": 6,
"node": "dcb62cfbfc9b3ab995a5cbbaff6e1971c3e4f865",
"revdate": [
0.0,
0
],
"targetline": 4
}
],
"author": "test",
"children": [],
"date": [
0.0,
0
],
"desc": "commit 6 (add another blank line between line 0 and 1)",
"node": "9d1b2c7db0175870a950f8c48c9c4ead1058f2c5",
"parents": [
"400ef1d404706cfb48afd2b78ce6addf641ced25"
],
"permissions": ""
}