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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
Augie Fackler - - Load All Authors

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test-convert-svn-encoding.t
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/ tests / test-convert-svn-encoding.t
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#require svn svn-bindings
$ cat >> $HGRCPATH <<EOF
> [extensions]
> convert =
> EOF
$ svnadmin create svn-repo
$ svnadmin load -q svn-repo < "$TESTDIR/svn/encoding.svndump"
Convert while testing all possible outputs
$ hg --debug convert svn-repo A-hg --config progress.debug=1
initializing destination A-hg repository
reparent to file:/*/$TESTTMP/svn-repo (glob)
run hg sink pre-conversion action
scanning source...
found trunk at 'trunk'
found tags at 'tags'
found branches at 'branches'
found branch branch\xc3\xa9 at 5 (esc)
found branch branch\xc3\xa9e at 6 (esc)
scanning: 1/4 revisions (25.00%)
reparent to file:/*/$TESTTMP/svn-repo/trunk (glob)
fetching revision log for "/trunk" from 4 to 0
parsing revision 4 (2 changes)
parsing revision 3 (4 changes)
parsing revision 2 (3 changes)
parsing revision 1 (3 changes)
no copyfrom path, don't know what to do.
'/branches' is not under '/trunk', ignoring
'/tags' is not under '/trunk', ignoring
scanning: 2/4 revisions (50.00%)
reparent to file:/*/$TESTTMP/svn-repo/branches/branch%C3%A9 (glob)
fetching revision log for "/branches/branch\xc3\xa9" from 5 to 0 (esc)
parsing revision 5 (1 changes)
reparent to file:/*/$TESTTMP/svn-repo (glob)
reparent to file:/*/$TESTTMP/svn-repo/branches/branch%C3%A9 (glob)
found parent of branch /branches/branch\xc3\xa9 at 4: /trunk (esc)
scanning: 3/4 revisions (75.00%)
reparent to file:/*/$TESTTMP/svn-repo/branches/branch%C3%A9e (glob)
fetching revision log for "/branches/branch\xc3\xa9e" from 6 to 0 (esc)
parsing revision 6 (1 changes)
reparent to file:/*/$TESTTMP/svn-repo (glob)
reparent to file:/*/$TESTTMP/svn-repo/branches/branch%C3%A9e (glob)
found parent of branch /branches/branch\xc3\xa9e at 5: /branches/branch\xc3\xa9 (esc)
scanning: 4/4 revisions (100.00%)
scanning: 5/4 revisions (125.00%)
scanning: 6/4 revisions (150.00%)
sorting...
converting...
5 init projA
source: svn:afeb9c47-92ff-4c0c-9f72-e1f6eb8ac9af/trunk@1
converting: 0/6 revisions (0.00%)
committing changelog
updating the branch cache
4 hello
source: svn:afeb9c47-92ff-4c0c-9f72-e1f6eb8ac9af/trunk@2
converting: 1/6 revisions (16.67%)
reparent to file:/*/$TESTTMP/svn-repo/trunk (glob)
scanning paths: /trunk/\xc3\xa0 0/3 paths (0.00%) (esc)
scanning paths: /trunk/\xc3\xa0/e\xcc\x81 1/3 paths (33.33%) (esc)
scanning paths: /trunk/\xc3\xa9 2/3 paths (66.67%) (esc)
committing files:
\xc3\xa0/e\xcc\x81 (esc)
getting files: \xc3\xa0/e\xcc\x81 1/2 files (50.00%) (esc)
\xc3\xa9 (esc)
getting files: \xc3\xa9 2/2 files (100.00%) (esc)
committing manifest
committing changelog
updating the branch cache
3 copy files
source: svn:afeb9c47-92ff-4c0c-9f72-e1f6eb8ac9af/trunk@3
converting: 2/6 revisions (33.33%)
scanning paths: /trunk/\xc3\xa0 0/4 paths (0.00%) (esc)
gone from -1
reparent to file:/*/$TESTTMP/svn-repo (glob)
reparent to file:/*/$TESTTMP/svn-repo/trunk (glob)
scanning paths: /trunk/\xc3\xa8 1/4 paths (25.00%) (esc)
copied to \xc3\xa8 from \xc3\xa9@2 (esc)
scanning paths: /trunk/\xc3\xa9 2/4 paths (50.00%) (esc)
gone from -1
reparent to file:/*/$TESTTMP/svn-repo (glob)
reparent to file:/*/$TESTTMP/svn-repo/trunk (glob)
scanning paths: /trunk/\xc3\xb9 3/4 paths (75.00%) (esc)
mark /trunk/\xc3\xb9 came from \xc3\xa0:2 (esc)
getting files: \xc3\xa0/e\xcc\x81 1/4 files (25.00%) (esc)
getting files: \xc3\xa9 2/4 files (50.00%) (esc)
committing files:
\xc3\xa8 (esc)
getting files: \xc3\xa8 3/4 files (75.00%) (esc)
\xc3\xa8: copy \xc3\xa9:6b67ccefd5ce6de77e7ead4f5292843a0255329f (esc)
\xc3\xb9/e\xcc\x81 (esc)
getting files: \xc3\xb9/e\xcc\x81 4/4 files (100.00%) (esc)
\xc3\xb9/e\xcc\x81: copy \xc3\xa0/e\xcc\x81:a9092a3d84a37b9993b5c73576f6de29b7ea50f6 (esc)
committing manifest
committing changelog
updating the branch cache
2 remove files
source: svn:afeb9c47-92ff-4c0c-9f72-e1f6eb8ac9af/trunk@4
converting: 3/6 revisions (50.00%)
scanning paths: /trunk/\xc3\xa8 0/2 paths (0.00%) (esc)
gone from -1
reparent to file:/*/$TESTTMP/svn-repo (glob)
reparent to file:/*/$TESTTMP/svn-repo/trunk (glob)
scanning paths: /trunk/\xc3\xb9 1/2 paths (50.00%) (esc)
gone from -1
reparent to file:/*/$TESTTMP/svn-repo (glob)
reparent to file:/*/$TESTTMP/svn-repo/trunk (glob)
getting files: \xc3\xa8 1/2 files (50.00%) (esc)
getting files: \xc3\xb9/e\xcc\x81 2/2 files (100.00%) (esc)
committing files:
committing manifest
committing changelog
updating the branch cache
1 branch to branch?
source: svn:afeb9c47-92ff-4c0c-9f72-e1f6eb8ac9af/branches/branch?@5
converting: 4/6 revisions (66.67%)
reparent to file:/*/$TESTTMP/svn-repo/branches/branch%C3%A9 (glob)
scanning paths: /branches/branch\xc3\xa9 0/1 paths (0.00%) (esc)
committing changelog
updating the branch cache
0 branch to branch?e
source: svn:afeb9c47-92ff-4c0c-9f72-e1f6eb8ac9af/branches/branch?e@6
converting: 5/6 revisions (83.33%)
reparent to file:/*/$TESTTMP/svn-repo/branches/branch%C3%A9e (glob)
scanning paths: /branches/branch\xc3\xa9e 0/1 paths (0.00%) (esc)
committing changelog
updating the branch cache
reparent to file:/*/$TESTTMP/svn-repo (glob)
reparent to file:/*/$TESTTMP/svn-repo/branches/branch%C3%A9e (glob)
reparent to file:/*/$TESTTMP/svn-repo (glob)
reparent to file:/*/$TESTTMP/svn-repo/branches/branch%C3%A9e (glob)
updating tags
committing files:
.hgtags
committing manifest
committing changelog
updating the branch cache
run hg sink post-conversion action
$ cd A-hg
$ hg up
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
Check tags are in UTF-8
$ cat .hgtags
e94e4422020e715add80525e8f0f46c9968689f1 branch\xc3\xa9e (esc)
f7e66f98380ed1e53a797c5c7a7a2616a7ab377d branch\xc3\xa9 (esc)
$ cd ..