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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

Yuya Nishihara - - Load All Authors

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        Matt Mackall
    
tests: replace exit 80 with #require

              r22046
            
      (Translations are optional)

        Martin Geisler
    
test-i18n: make test conditional on msgfmt availability

              r13442
            
        timeless@mozdev.org
    
test-i18n: always run non gettext tests

              r26252
            
      #if gettext no-outer-repo

        Mads Kiilerich
    
tests: add missing no-outer-repo requirements...

              r17015
            
        Martin Geisler
    
test-i18n: test translations

              r13414
            
      Test that translations are compiled and installed correctly.

      Default encoding in tests is "ascii" and the translation is encoded

      using the "replace" error handler:

        $ LANGUAGE=pt_BR hg tip

        Wagner Bruna
    
test-i18n, i18n-pt_BR: updated test message changed in 41c3a71c318d

              r14920
            
        abortado: n?o foi encontrado um reposit?rio em '$TESTTMP' (.hg n?o encontrado)!

        Martin Geisler
    
test-i18n: test translations

              r13414
            
        [255]

        Mads Kiilerich
    
spelling: fixes from spell checker

              r21024
            
      Using a more accommodating encoding:

        Martin Geisler
    
test-i18n: test translations

              r13414
            
        $ HGENCODING=UTF-8 LANGUAGE=pt_BR hg tip

        Wagner Bruna
    
test-i18n, i18n-pt_BR: updated test message changed in 41c3a71c318d

              r14920
            
        abortado: n\xc3\xa3o foi encontrado um reposit\xc3\xb3rio em '$TESTTMP' (.hg n\xc3\xa3o encontrado)! (esc)

        Martin Geisler
    
test-i18n: test translations

              r13414
            
        [255]

      Different encoding:

        $ HGENCODING=Latin-1 LANGUAGE=pt_BR hg tip

        Wagner Bruna
    
test-i18n, i18n-pt_BR: updated test message changed in 41c3a71c318d

              r14920
            
        abortado: n\xe3o foi encontrado um reposit\xf3rio em '$TESTTMP' (.hg n\xe3o encontrado)! (esc)

        Martin Geisler
    
test-i18n: test translations

              r13414
            
        [255]

        Olav Reinert
    
help: test keyword search in translated text....

              r16895
            
        Mads Kiilerich
    
tests: add missing no-outer-repo requirements...

              r17015
            
      #endif

        timeless@mozdev.org
    
test-i18n: always run non gettext tests

              r26252
            
      #if gettext

        Olav Reinert
    
help: test keyword search in translated text....

              r16895
            
      Test keyword search in translated help text:

        Augie Fackler
    
tests: update test-i18n.t to not depend on the pager extension...

              r30943
            
        $ HGENCODING=UTF-8 LANGUAGE=de hg help -k Aktualisiert

        Simon Heimberg
    
i18n-de: update many fuzzy entries and translate some simple ones...

              r20338
            
        Themen:

        Olav Reinert
    
help: test keyword search in translated text....

              r16895
            
        Augie Fackler
    
tests: update test-i18n.t to not depend on the pager extension...

              r30943
            
         subrepos Unterarchive

        Olav Reinert
    
help: test keyword search in translated text....

              r16895
            
        Augie Fackler
    
tests: update test-i18n.t to not depend on the pager extension...

              r30943
            
        Befehle:

        Olav Reinert
    
help: test keyword search in translated text....

              r16895
            
        Augie Fackler
    
tests: update test-i18n.t to not depend on the pager extension...

              r30943
            
         pull   Ruft \xc3\x84nderungen von der angegebenen Quelle ab (esc)

         update Aktualisiert das Arbeitsverzeichnis (oder wechselt die Version)

        Olav Reinert
    
help: test keyword search in translated text....

              r16895
            
        timeless@mozdev.org
    
test-i18n: always run non gettext tests

              r26252
            
      #endif

        FUJIWARA Katsunori
    
i18n: add the tool to check Mercurial specific translation problems in *.po...

              r20152
            
      Check Mercurial specific translation problems in each *.po files, and

      tool itself by doctest

        $ cd "$TESTDIR"/../i18n

        Augie Fackler
    
cleanup: use $PYTHON to run python in many more tests...

              r32940
            
        $ $PYTHON check-translation.py *.po

        $ $PYTHON check-translation.py --doctest

        FUJIWARA Katsunori
    
i18n: add the tool to check Mercurial specific translation problems in *.po...

              r20152
            
        $ cd $TESTTMP

        Yuya Nishihara
    
i18n: cache translated messages per encoding...

              r34661
            
        Yuya Nishihara
    
test-i18n: guard gettext test appropriately

              r34689
            
      #if gettext

        Yuya Nishihara
    
i18n: cache translated messages per encoding...

              r34661
            
      Check i18n cache isn't reused after encoding change:

        $ cat > $TESTTMP/encodingchange.py << EOF

        > from mercurial import encoding, registrar

        > from mercurial.i18n import _

        > cmdtable = {}

        > command = registrar.command(cmdtable)

        > @command(b'encodingchange', norepo=True)

        > def encodingchange(ui):

        >     for encode in (b'ascii', b'UTF-8', b'ascii', b'UTF-8'):

        >         encoding.encoding = encode

        >         ui.write(b'%s\n' % _(b'(EXPERIMENTAL)'))

        > EOF

        $ LANGUAGE=ja hg --config extensions.encodingchange=$TESTTMP/encodingchange.py encodingchange

        (?????)

        (\xe5\xae\x9f\xe9\xa8\x93\xe7\x9a\x84\xe5\xae\x9f\xe8\xa3\x85) (esc)

        (?????)

        (\xe5\xae\x9f\xe9\xa8\x93\xe7\x9a\x84\xe5\xae\x9f\xe8\xa3\x85) (esc)

        Yuya Nishihara
    
test-i18n: guard gettext test appropriately

              r34689
            
      #endif

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Matt Mackall tests: replace exit 80 with #require	r22046	(Translations are optional)
Martin Geisler test-i18n: make test conditional on msgfmt availability	r13442
timeless@mozdev.org test-i18n: always run non gettext tests	r26252	#if gettext no-outer-repo
Mads Kiilerich tests: add missing no-outer-repo requirements...	r17015
Martin Geisler test-i18n: test translations	r13414	Test that translations are compiled and installed correctly.

		Default encoding in tests is "ascii" and the translation is encoded
		using the "replace" error handler:

		$ LANGUAGE=pt_BR hg tip
Wagner Bruna test-i18n, i18n-pt_BR: updated test message changed in 41c3a71c318d	r14920	abortado: n?o foi encontrado um reposit?rio em '$TESTTMP' (.hg n?o encontrado)!
Martin Geisler test-i18n: test translations	r13414	[255]

Mads Kiilerich spelling: fixes from spell checker	r21024	Using a more accommodating encoding:
Martin Geisler test-i18n: test translations	r13414
		$ HGENCODING=UTF-8 LANGUAGE=pt_BR hg tip
Wagner Bruna test-i18n, i18n-pt_BR: updated test message changed in 41c3a71c318d	r14920	abortado: n\xc3\xa3o foi encontrado um reposit\xc3\xb3rio em '$TESTTMP' (.hg n\xc3\xa3o encontrado)! (esc)
Martin Geisler test-i18n: test translations	r13414	[255]

		Different encoding:

		$ HGENCODING=Latin-1 LANGUAGE=pt_BR hg tip
Wagner Bruna test-i18n, i18n-pt_BR: updated test message changed in 41c3a71c318d	r14920	abortado: n\xe3o foi encontrado um reposit\xf3rio em '$TESTTMP' (.hg n\xe3o encontrado)! (esc)
Martin Geisler test-i18n: test translations	r13414	[255]
Olav Reinert help: test keyword search in translated text....	r16895
Mads Kiilerich tests: add missing no-outer-repo requirements...	r17015	#endif

timeless@mozdev.org test-i18n: always run non gettext tests	r26252	#if gettext

Olav Reinert help: test keyword search in translated text....	r16895	Test keyword search in translated help text:

Augie Fackler tests: update test-i18n.t to not depend on the pager extension...	r30943	$ HGENCODING=UTF-8 LANGUAGE=de hg help -k Aktualisiert
Simon Heimberg i18n-de: update many fuzzy entries and translate some simple ones...	r20338	Themen:
Olav Reinert help: test keyword search in translated text....	r16895
Augie Fackler tests: update test-i18n.t to not depend on the pager extension...	r30943	subrepos Unterarchive
Olav Reinert help: test keyword search in translated text....	r16895
Augie Fackler tests: update test-i18n.t to not depend on the pager extension...	r30943	Befehle:
Olav Reinert help: test keyword search in translated text....	r16895
Augie Fackler tests: update test-i18n.t to not depend on the pager extension...	r30943	pull Ruft \xc3\x84nderungen von der angegebenen Quelle ab (esc)
		update Aktualisiert das Arbeitsverzeichnis (oder wechselt die Version)
Olav Reinert help: test keyword search in translated text....	r16895
timeless@mozdev.org test-i18n: always run non gettext tests	r26252	#endif

FUJIWARA Katsunori i18n: add the tool to check Mercurial specific translation problems in *.po...	r20152	Check Mercurial specific translation problems in each *.po files, and
		tool itself by doctest

		$ cd "$TESTDIR"/../i18n
Augie Fackler cleanup: use $PYTHON to run python in many more tests...	r32940	$ $PYTHON check-translation.py *.po
		$ $PYTHON check-translation.py --doctest
FUJIWARA Katsunori i18n: add the tool to check Mercurial specific translation problems in *.po...	r20152	$ cd $TESTTMP
Yuya Nishihara i18n: cache translated messages per encoding...	r34661
Yuya Nishihara test-i18n: guard gettext test appropriately	r34689	#if gettext

Yuya Nishihara i18n: cache translated messages per encoding...	r34661	Check i18n cache isn't reused after encoding change:

		$ cat > $TESTTMP/encodingchange.py << EOF
		> from mercurial import encoding, registrar
		> from mercurial.i18n import _
		> cmdtable = {}
		> command = registrar.command(cmdtable)
		> @command(b'encodingchange', norepo=True)
		> def encodingchange(ui):
		> for encode in (b'ascii', b'UTF-8', b'ascii', b'UTF-8'):
		> encoding.encoding = encode
		> ui.write(b'%s\n' % _(b'(EXPERIMENTAL)'))
		> EOF

		$ LANGUAGE=ja hg --config extensions.encodingchange=$TESTTMP/encodingchange.py encodingchange
		(?????)
		(\xe5\xae\x9f\xe9\xa8\x93\xe7\x9a\x84\xe5\xae\x9f\xe8\xa3\x85) (esc)
		(?????)
		(\xe5\xae\x9f\xe9\xa8\x93\xe7\x9a\x84\xe5\xae\x9f\xe8\xa3\x85) (esc)
Yuya Nishihara test-i18n: guard gettext test appropriately	r34689
		#endif