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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

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test-completion.t
391 lines | 9.2 KiB | text/troff | Tads3Lexer
Show all commands except debug commands
$ hg debugcomplete
add
addremove
annotate
archive
backout
bisect
bookmarks
branch
branches
bundle
cat
clone
commit
config
copy
diff
export
files
forget
graft
grep
heads
help
identify
import
incoming
init
locate
log
manifest
merge
outgoing
parents
paths
phase
pull
push
recover
remove
rename
resolve
revert
rollback
root
serve
status
summary
tag
tags
tip
unbundle
update
verify
version
Show all commands that start with "a"
$ hg debugcomplete a
add
addremove
annotate
archive
Do not show debug commands if there are other candidates
$ hg debugcomplete d
diff
Show debug commands if there are no other candidates
$ hg debugcomplete debug
debugancestor
debugapplystreamclonebundle
debugbuilddag
debugbundle
debugcapabilities
debugcheckstate
debugcolor
debugcommands
debugcomplete
debugconfig
debugcreatestreamclonebundle
debugdag
debugdata
debugdate
debugdeltachain
debugdirstate
debugdiscovery
debugdownload
debugextensions
debugfileset
debugformat
debugfsinfo
debuggetbundle
debugignore
debugindex
debugindexdot
debuginstall
debugknown
debuglabelcomplete
debuglocks
debugmergestate
debugnamecomplete
debugobsolete
debugpathcomplete
debugpeer
debugpickmergetool
debugpushkey
debugpvec
debugrebuilddirstate
debugrebuildfncache
debugrename
debugrevlog
debugrevspec
debugsetparents
debugssl
debugsub
debugsuccessorssets
debugtemplate
debugupdatecaches
debugupgraderepo
debugwalk
debugwireargs
Do not show the alias of a debug command if there are other candidates
(this should hide rawcommit)
$ hg debugcomplete r
recover
remove
rename
resolve
revert
rollback
root
Show the alias of a debug command if there are no other candidates
$ hg debugcomplete rawc
Show the global options
$ hg debugcomplete --options | sort
--color
--config
--cwd
--debug
--debugger
--encoding
--encodingmode
--help
--hidden
--noninteractive
--pager
--profile
--quiet
--repository
--time
--traceback
--verbose
--version
-R
-h
-q
-v
-y
Show the options for the "serve" command
$ hg debugcomplete --options serve | sort
--accesslog
--address
--certificate
--cmdserver
--color
--config
--cwd
--daemon
--daemon-postexec
--debug
--debugger
--encoding
--encodingmode
--errorlog
--help
--hidden
--ipv6
--name
--noninteractive
--pager
--pid-file
--port
--prefix
--profile
--quiet
--repository
--stdio
--style
--subrepos
--templates
--time
--traceback
--verbose
--version
--web-conf
-6
-A
-E
-R
-S
-a
-d
-h
-n
-p
-q
-t
-v
-y
Show an error if we use --options with an ambiguous abbreviation
$ hg debugcomplete --options s
hg: command 's' is ambiguous:
serve showconfig status summary
[255]
Show all commands + options
$ hg debugcommands
add: include, exclude, subrepos, dry-run
annotate: rev, follow, no-follow, text, user, file, date, number, changeset, line-number, skip, ignore-all-space, ignore-space-change, ignore-blank-lines, ignore-space-at-eol, include, exclude, template
clone: noupdate, updaterev, rev, branch, pull, uncompressed, stream, ssh, remotecmd, insecure
commit: addremove, close-branch, amend, secret, edit, interactive, include, exclude, message, logfile, date, user, subrepos
diff: rev, change, text, git, binary, nodates, noprefix, show-function, reverse, ignore-all-space, ignore-space-change, ignore-blank-lines, ignore-space-at-eol, unified, stat, root, include, exclude, subrepos
export: output, switch-parent, rev, text, git, binary, nodates
forget: include, exclude
init: ssh, remotecmd, insecure
log: follow, follow-first, date, copies, keyword, rev, line-range, removed, only-merges, user, only-branch, branch, prune, patch, git, limit, no-merges, stat, graph, style, template, include, exclude
merge: force, rev, preview, abort, tool
pull: update, force, rev, bookmark, branch, ssh, remotecmd, insecure
push: force, rev, bookmark, branch, new-branch, pushvars, ssh, remotecmd, insecure
remove: after, force, subrepos, include, exclude
serve: accesslog, daemon, daemon-postexec, errorlog, port, address, prefix, name, web-conf, webdir-conf, pid-file, stdio, cmdserver, templates, style, ipv6, certificate, subrepos
status: all, modified, added, removed, deleted, clean, unknown, ignored, no-status, terse, copies, print0, rev, change, include, exclude, subrepos, template
summary: remote
update: clean, check, merge, date, rev, tool
addremove: similarity, subrepos, include, exclude, dry-run
archive: no-decode, prefix, rev, type, subrepos, include, exclude
backout: merge, commit, no-commit, parent, rev, edit, tool, include, exclude, message, logfile, date, user
bisect: reset, good, bad, skip, extend, command, noupdate
bookmarks: force, rev, delete, rename, inactive, template
branch: force, clean, rev
branches: active, closed, template
bundle: force, rev, branch, base, all, type, ssh, remotecmd, insecure
cat: output, rev, decode, include, exclude, template
config: untrusted, edit, local, global, template
copy: after, force, include, exclude, dry-run
debugancestor:
debugapplystreamclonebundle:
debugbuilddag: mergeable-file, overwritten-file, new-file
debugbundle: all, part-type, spec
debugcapabilities:
debugcheckstate:
debugcolor: style
debugcommands:
debugcomplete: options
debugcreatestreamclonebundle:
debugdag: tags, branches, dots, spaces
debugdata: changelog, manifest, dir
debugdate: extended
debugdeltachain: changelog, manifest, dir, template
debugdirstate: nodates, datesort
debugdiscovery: old, nonheads, rev, ssh, remotecmd, insecure
debugdownload: output
debugextensions: template
debugfileset: rev
debugformat: template
debugfsinfo:
debuggetbundle: head, common, type
debugignore:
debugindex: changelog, manifest, dir, format
debugindexdot: changelog, manifest, dir
debuginstall: template
debugknown:
debuglabelcomplete:
debuglocks: force-lock, force-wlock, set-lock, set-wlock
debugmergestate:
debugnamecomplete:
debugobsolete: flags, record-parents, rev, exclusive, index, delete, date, user, template
debugpathcomplete: full, normal, added, removed
debugpeer:
debugpickmergetool: rev, changedelete, include, exclude, tool
debugpushkey:
debugpvec:
debugrebuilddirstate: rev, minimal
debugrebuildfncache:
debugrename: rev
debugrevlog: changelog, manifest, dir, dump
debugrevspec: optimize, show-revs, show-set, show-stage, no-optimized, verify-optimized
debugsetparents:
debugssl:
debugsub: rev
debugsuccessorssets: closest
debugtemplate: rev, define
debugupdatecaches:
debugupgraderepo: optimize, run
debugwalk: include, exclude
debugwireargs: three, four, five, ssh, remotecmd, insecure
files: rev, print0, include, exclude, template, subrepos
graft: rev, continue, edit, log, force, currentdate, currentuser, date, user, tool, dry-run
grep: print0, all, text, follow, ignore-case, files-with-matches, line-number, rev, user, date, template, include, exclude
heads: rev, topo, active, closed, style, template
help: extension, command, keyword, system
identify: rev, num, id, branch, tags, bookmarks, ssh, remotecmd, insecure, template
import: strip, base, edit, force, no-commit, bypass, partial, exact, prefix, import-branch, message, logfile, date, user, similarity
incoming: force, newest-first, bundle, rev, bookmarks, branch, patch, git, limit, no-merges, stat, graph, style, template, ssh, remotecmd, insecure, subrepos
locate: rev, print0, fullpath, include, exclude
manifest: rev, all, template
outgoing: force, rev, newest-first, bookmarks, branch, patch, git, limit, no-merges, stat, graph, style, template, ssh, remotecmd, insecure, subrepos
parents: rev, style, template
paths: template
phase: public, draft, secret, force, rev
recover:
rename: after, force, include, exclude, dry-run
resolve: all, list, mark, unmark, no-status, tool, include, exclude, template
revert: all, date, rev, no-backup, interactive, include, exclude, dry-run
rollback: dry-run, force
root:
tag: force, local, rev, remove, edit, message, date, user
tags: template
tip: patch, git, style, template
unbundle: update
verify:
version: template
$ hg init a
$ cd a
$ echo fee > fee
$ hg ci -q -Amfee
$ hg tag fee
$ mkdir fie
$ echo dead > fie/dead
$ echo live > fie/live
$ hg bookmark fo
$ hg branch -q fie
$ hg ci -q -Amfie
$ echo fo > fo
$ hg branch -qf default
$ hg ci -q -Amfo
$ echo Fum > Fum
$ hg ci -q -AmFum
$ hg bookmark Fum
Test debugpathcomplete
$ hg debugpathcomplete f
fee
fie
fo
$ hg debugpathcomplete -f f
fee
fie/dead
fie/live
fo
$ hg rm Fum
$ hg debugpathcomplete -r F
Fum
Test debugnamecomplete
$ hg debugnamecomplete
Fum
default
fee
fie
fo
tip
$ hg debugnamecomplete f
fee
fie
fo
Test debuglabelcomplete, a deprecated name for debugnamecomplete that is still
used for completions in some shells.
$ hg debuglabelcomplete
Fum
default
fee
fie
fo
tip
$ hg debuglabelcomplete f
fee
fie
fo