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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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r34490:270e344a default
r35994:48a3a928 default
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test-histedit-outgoing.t
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$ cat >> $HGRCPATH <<EOF
> [extensions]
> histedit=
> EOF
$ initrepos ()
> {
> hg init r
> cd r
> for x in a b c ; do
> echo $x > $x
> hg add $x
> hg ci -m $x
> done
> cd ..
> hg clone r r2 | grep -v updating
> cd r2
> for x in d e f ; do
> echo $x > $x
> hg add $x
> hg ci -m $x
> done
> cd ..
> hg init r3
> cd r3
> for x in g h i ; do
> echo $x > $x
> hg add $x
> hg ci -m $x
> done
> cd ..
> }
$ initrepos
3 files updated, 0 files merged, 0 files removed, 0 files unresolved
show the edit commands offered by outgoing
$ cd r2
$ HGEDITOR=cat hg histedit --outgoing ../r | grep -v comparing | grep -v searching
pick 055a42cdd887 3 d
pick e860deea161a 4 e
pick 652413bf663e 5 f
# Edit history between 055a42cdd887 and 652413bf663e
#
# Commits are listed from least to most recent
#
# You can reorder changesets by reordering the lines
#
# Commands:
#
# e, edit = use commit, but stop for amending
# m, mess = edit commit message without changing commit content
# p, pick = use commit
# b, base = checkout changeset and apply further changesets from there
# d, drop = remove commit from history
# f, fold = use commit, but combine it with the one above
# r, roll = like fold, but discard this commit's description and date
#
$ cd ..
show the error from unrelated repos
$ cd r3
$ HGEDITOR=cat hg histedit --outgoing ../r | grep -v comparing | grep -v searching
abort: repository is unrelated
[1]
$ cd ..
show the error from unrelated repos
$ cd r3
$ HGEDITOR=cat hg histedit --force --outgoing ../r
comparing with ../r
searching for changes
warning: repository is unrelated
pick 2a4042b45417 0 g
pick 68c46b4927ce 1 h
pick 51281e65ba79 2 i
# Edit history between 2a4042b45417 and 51281e65ba79
#
# Commits are listed from least to most recent
#
# You can reorder changesets by reordering the lines
#
# Commands:
#
# e, edit = use commit, but stop for amending
# m, mess = edit commit message without changing commit content
# p, pick = use commit
# b, base = checkout changeset and apply further changesets from there
# d, drop = remove commit from history
# f, fold = use commit, but combine it with the one above
# r, roll = like fold, but discard this commit's description and date
#
$ cd ..
test sensitivity to branch in URL:
$ cd r2
$ hg -q update 2
$ hg -q branch foo
$ hg commit -m 'create foo branch'
$ HGEDITOR=cat hg histedit --outgoing '../r#foo' | grep -v comparing | grep -v searching
pick f26599ee3441 6 create foo branch
# Edit history between f26599ee3441 and f26599ee3441
#
# Commits are listed from least to most recent
#
# You can reorder changesets by reordering the lines
#
# Commands:
#
# e, edit = use commit, but stop for amending
# m, mess = edit commit message without changing commit content
# p, pick = use commit
# b, base = checkout changeset and apply further changesets from there
# d, drop = remove commit from history
# f, fold = use commit, but combine it with the one above
# r, roll = like fold, but discard this commit's description and date
#
test to check number of roots in outgoing revisions
$ hg -q outgoing -G --template '{node|short}({branch})' '../r'
@ f26599ee3441(foo)
o 652413bf663e(default)
|
o e860deea161a(default)
|
o 055a42cdd887(default)
$ HGEDITOR=cat hg -q histedit --outgoing '../r'
abort: there are ambiguous outgoing revisions
(see 'hg help histedit' for more detail)
[255]
$ hg -q update -C 2
$ echo aa >> a
$ hg -q commit -m 'another head on default'
$ hg -q outgoing -G --template '{node|short}({branch})' '../r#default'
@ 3879dc049647(default)
o 652413bf663e(default)
|
o e860deea161a(default)
|
o 055a42cdd887(default)
$ HGEDITOR=cat hg -q histedit --outgoing '../r#default'
abort: there are ambiguous outgoing revisions
(see 'hg help histedit' for more detail)
[255]
$ cd ..