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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-debugbuilddag.t
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Pradeepkumar Gayam
tests: unify test-debugbuilddag
 r11922
Peter Arrenbrecht
debugbuilddag: use memctx for speed...
 r14163 plain
Pradeepkumar Gayam
tests: unify test-debugbuilddag
 r11922
Martin Geisler
test-debugbuilddag: replace unneeded 'rm -rf' with 'rm -r'
 r14278 $ hg init
Martin Geisler
debugbuilddag: output progress information
 r14279 $ hg debugbuilddag '+2:f +3:p2 @temp <f+4 @default /p2 +2' \
> --config extensions.progress= --config progress.assume-tty=1 \
> --config progress.delay=0 --config progress.refresh=0 \
Julien Cristau
tests: disable progress estimate in test-debugbuilddag.t...
 r16368 > --config progress.format=topic,bar,number \
Mads Kiilerich
tests: drop filtercr.py and use the very explicit '\r (no-eol) (esc)' markup
 r17743 > --config progress.width=60
\r (no-eol) (esc)
building [ ] 0/12\r (no-eol) (esc)
building [ ] 0/12\r (no-eol) (esc)
building [==> ] 1/12\r (no-eol) (esc)
building [==> ] 1/12\r (no-eol) (esc)
building [======> ] 2/12\r (no-eol) (esc)
building [=========> ] 3/12\r (no-eol) (esc)
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building [=====================================> ] 11/12\r (no-eol) (esc)
\r (no-eol) (esc)
Martin Geisler
debugbuilddag: output progress information
 r14279
Peter Arrenbrecht
debugbuilddag: use memctx for speed...
 r14163 tags
$ cat .hg/localtags
66f7d451a68b85ed82ff5fcc254daf50c74144bd f
bebd167eb94d257ace0e814aeb98e6972ed2970d p2
Pradeepkumar Gayam
tests: unify test-debugbuilddag
 r11922 dag
$ hg debugdag -t -b
+2:f
+3:p2
@temp*f+3
@default*/p2+2:tip
tip
$ hg id
Peter Arrenbrecht
debugbuilddag: use memctx for speed...
 r14163 000000000000
Pradeepkumar Gayam
tests: unify test-debugbuilddag
 r11922 glog
Martin Geisler
tests: don't load unnecessary graphlog extension...
 r20117 $ hg log -G --template '{rev}: {desc} [{branches}] @ {date}\n'
Peter Arrenbrecht
debugbuilddag: use memctx for speed...
 r14163 o 11: r11 [] @ 11.00
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o 10: r10 [] @ 10.00
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o 9: r9 [] @ 9.00
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| o 8: r8 [temp] @ 8.00
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o | 4: r4 [] @ 4.00
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o | 3: r3 [] @ 3.00
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o | 2: r2 [] @ 2.00
|/
o 1: r1 [] @ 1.00
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o 0: r0 [] @ 0.00
Wagner Bruna
debugbuilddag: fix starting a dag on a non-default branch
 r16219 overwritten files, starting on a non-default branch
Peter Arrenbrecht
debugbuilddag: use memctx for speed...
 r14163
Martin Geisler
test-debugbuilddag: replace unneeded 'rm -rf' with 'rm -r'
 r14278 $ rm -r .hg
$ hg init
Wagner Bruna
debugbuilddag: fix starting a dag on a non-default branch
 r16219 $ hg debugbuilddag '@start.@default.:f +3:p2 @temp <f+4 @default /p2 +2' -q -o
Peter Arrenbrecht
debugbuilddag: use memctx for speed...
 r14163 tags
$ cat .hg/localtags
Wagner Bruna
debugbuilddag: fix starting a dag on a non-default branch
 r16219 f778700ebd50fcf282b23a4446bd155da6453eb6 f
bbccf169769006e2490efd2a02f11c3d38d462bd p2
Peter Arrenbrecht
debugbuilddag: use memctx for speed...
 r14163 dag
$ hg debugdag -t -b
Wagner Bruna
debugbuilddag: fix starting a dag on a non-default branch
 r16219 @start+1
@default+1:f
Peter Arrenbrecht
debugbuilddag: use memctx for speed...
 r14163 +3:p2
@temp*f+3
@default*/p2+2:tip
tip
$ hg id
000000000000
glog
Martin Geisler
tests: don't load unnecessary graphlog extension...
 r20117 $ hg log -G --template '{rev}: {desc} [{branches}] @ {date}\n'
Peter Arrenbrecht
debugbuilddag: use memctx for speed...
 r14163 o 11: r11 [] @ 11.00
Pradeepkumar Gayam
tests: unify test-debugbuilddag
 r11922 |
o 10: r10 [] @ 10.00
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o 9: r9 [] @ 9.00
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| o 8: r8 [temp] @ 8.00
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o | 4: r4 [] @ 4.00
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o | 3: r3 [] @ 3.00
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o | 2: r2 [] @ 2.00
|/
o 1: r1 [] @ 1.00
|
Wagner Bruna
debugbuilddag: fix starting a dag on a non-default branch
 r16219 o 0: r0 [start] @ 0.00
Pradeepkumar Gayam
tests: unify test-debugbuilddag
 r11922
glog of
Martin Geisler
tests: don't load unnecessary graphlog extension...
 r20117 $ hg log -G --template '{rev}: {desc} [{branches}]\n' of
Peter Arrenbrecht
debugbuilddag: use memctx for speed...
 r14163 o 11: r11 []
Pradeepkumar Gayam
tests: unify test-debugbuilddag
 r11922 |
o 10: r10 []
|
o 9: r9 []
|\
| o 8: r8 [temp]
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| o 7: r7 [temp]
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| o 6: r6 [temp]
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| o 5: r5 [temp]
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o | 4: r4 []
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o | 3: r3 []
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o | 2: r2 []
|/
o 1: r1 []
|
Wagner Bruna
debugbuilddag: fix starting a dag on a non-default branch
 r16219 o 0: r0 [start]
Pradeepkumar Gayam
tests: unify test-debugbuilddag
 r11922
tags
$ hg tags -v
Wagner Bruna
debugbuilddag: fix starting a dag on a non-default branch
 r16219 tip 11:9ffe238a67a2
p2 4:bbccf1697690 local
f 1:f778700ebd50 local
Pradeepkumar Gayam
tests: unify test-debugbuilddag
 r11922 cat of
Peter Arrenbrecht
debugbuilddag: use memctx for speed...
 r14163 $ hg cat of --rev tip
Pradeepkumar Gayam
tests: unify test-debugbuilddag
 r11922 r11
Peter Arrenbrecht
debugbuilddag: use memctx for speed...
 r14163
Pradeepkumar Gayam
tests: unify test-debugbuilddag
 r11922 new and mergeable files
Martin Geisler
test-debugbuilddag: replace unneeded 'rm -rf' with 'rm -r'
 r14278 $ rm -r .hg
$ hg init
Pradeepkumar Gayam
tests: unify test-debugbuilddag
 r11922 $ hg debugbuilddag '+2:f +3:p2 @temp <f+4 @default /p2 +2' -q -mn
dag
$ hg debugdag -t -b
+2:f
+3:p2
@temp*f+3
@default*/p2+2:tip
tip
$ hg id
Peter Arrenbrecht
debugbuilddag: use memctx for speed...
 r14163 000000000000
Pradeepkumar Gayam
tests: unify test-debugbuilddag
 r11922 glog
Martin Geisler
tests: don't load unnecessary graphlog extension...
 r20117 $ hg log -G --template '{rev}: {desc} [{branches}] @ {date}\n'
Peter Arrenbrecht
debugbuilddag: use memctx for speed...
 r14163 o 11: r11 [] @ 11.00
Pradeepkumar Gayam
tests: unify test-debugbuilddag
 r11922 |
o 10: r10 [] @ 10.00
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o 9: r9 [] @ 9.00
|\
| o 8: r8 [temp] @ 8.00
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| o 7: r7 [temp] @ 7.00
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| o 6: r6 [temp] @ 6.00
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| o 5: r5 [temp] @ 5.00
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o | 4: r4 [] @ 4.00
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o | 3: r3 [] @ 3.00
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o | 2: r2 [] @ 2.00
|/
o 1: r1 [] @ 1.00
|
o 0: r0 [] @ 0.00
glog mf
Martin Geisler
tests: don't load unnecessary graphlog extension...
 r20117 $ hg log -G --template '{rev}: {desc} [{branches}]\n' mf
Peter Arrenbrecht
debugbuilddag: use memctx for speed...
 r14163 o 11: r11 []
Pradeepkumar Gayam
tests: unify test-debugbuilddag
 r11922 |
o 10: r10 []
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o 9: r9 []
|\
| o 8: r8 [temp]
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| o 7: r7 [temp]
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| o 6: r6 [temp]
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| o 5: r5 [temp]
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o | 4: r4 []
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o | 3: r3 []
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o | 2: r2 []
|/
o 1: r1 []
|
o 0: r0 []
man r4
$ hg manifest -r4
mf
nf0
nf1
nf2
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nf4
cat r4 mf
$ hg cat -r4 mf
0 r0
1
2 r1
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4 r2
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6 r3
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man r8
$ hg manifest -r8
mf
nf0
nf1
nf5
nf6
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nf8
cat r8 mf
$ hg cat -r8 mf
0 r0
1
2 r1
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10 r5
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12 r6
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man
Peter Arrenbrecht
debugbuilddag: use memctx for speed...
 r14163 $ hg manifest --rev tip
Pradeepkumar Gayam
tests: unify test-debugbuilddag
 r11922 mf
nf0
nf1
nf10
nf11
nf2
nf3
nf4
nf5
nf6
nf7
nf8
nf9
cat mf
Peter Arrenbrecht
debugbuilddag: use memctx for speed...
 r14163 $ hg cat mf --rev tip
Pradeepkumar Gayam
tests: unify test-debugbuilddag
 r11922 0 r0
1
2 r1
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Peter Arrenbrecht
debugbuilddag: use memctx for speed...
 r14163