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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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r35994:48a3a928 default
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test-githelp.t
296 lines | 7.8 KiB | text/troff | Tads3Lexer
$ cat >> $HGRCPATH << EOF
> [extensions]
> githelp =
> EOF
$ hg init repo
$ cd repo
$ echo foo > test_file
$ mkdir dir
$ echo foo > dir/file
$ echo foo > removed_file
$ echo foo > deleted_file
$ hg add -q .
$ hg commit -m 'bar'
$ hg bookmark both
$ touch both
$ touch untracked_file
$ hg remove removed_file
$ rm deleted_file
githelp on a single command should succeed
$ hg githelp -- commit
hg commit
$ hg githelp -- git commit
hg commit
githelp should fail nicely if we don't give it arguments
$ hg githelp
abort: missing git command - usage: hg githelp -- <git command>
[255]
$ hg githelp -- git
abort: missing git command - usage: hg githelp -- <git command>
[255]
githelp on a command with options should succeed
$ hg githelp -- commit -pm "abc"
hg commit --interactive -m 'abc'
githelp on a command with standalone unrecognized option should succeed with warning
$ hg githelp -- commit -p -v
ignoring unknown option -v
hg commit --interactive
githelp on a command with unrecognized option packed with other options should fail with error
$ hg githelp -- commit -pv
abort: unknown option v packed with other options
Please try passing the option as it's own flag: -v
[255]
githelp for git rebase --skip
$ hg githelp -- git rebase --skip
hg revert --all -r .
hg rebase --continue
githelp for git commit --amend (hg commit --amend pulls up an editor)
$ hg githelp -- commit --amend
hg commit --amend
githelp for git commit --amend --no-edit (hg amend does not pull up an editor)
$ hg githelp -- commit --amend --no-edit
hg amend
githelp for git checkout -- . (checking out a directory)
$ hg githelp -- checkout -- .
note: use --no-backup to avoid creating .orig files
hg revert .
githelp for git checkout "HEAD^" (should still work to pass a rev)
$ hg githelp -- checkout "HEAD^"
hg update .^
githelp checkout: args after -- should be treated as paths no matter what
$ hg githelp -- checkout -- HEAD
note: use --no-backup to avoid creating .orig files
hg revert HEAD
githelp for git checkout with rev and path
$ hg githelp -- checkout "HEAD^" -- file.txt
note: use --no-backup to avoid creating .orig files
hg revert -r .^ file.txt
githelp for git with rev and path, without separator
$ hg githelp -- checkout "HEAD^" file.txt
note: use --no-backup to avoid creating .orig files
hg revert -r .^ file.txt
githelp for checkout with a file as first argument
$ hg githelp -- checkout test_file
note: use --no-backup to avoid creating .orig files
hg revert test_file
githelp for checkout with a removed file as first argument
$ hg githelp -- checkout removed_file
note: use --no-backup to avoid creating .orig files
hg revert removed_file
githelp for checkout with a deleted file as first argument
$ hg githelp -- checkout deleted_file
note: use --no-backup to avoid creating .orig files
hg revert deleted_file
githelp for checkout with a untracked file as first argument
$ hg githelp -- checkout untracked_file
note: use --no-backup to avoid creating .orig files
hg revert untracked_file
githelp for checkout with a directory as first argument
$ hg githelp -- checkout dir
note: use --no-backup to avoid creating .orig files
hg revert dir
githelp for checkout when not in repo root
$ cd dir
$ hg githelp -- checkout file
note: use --no-backup to avoid creating .orig files
hg revert file
$ cd ..
githelp for checkout with an argument that is both a file and a revision
$ hg githelp -- checkout both
hg update both
githelp for checkout with the -p option
$ hg githelp -- git checkout -p xyz
hg revert -i -r xyz
$ hg githelp -- git checkout -p xyz -- abc
note: use --no-backup to avoid creating .orig files
hg revert -i -r xyz abc
githelp for checkout with the -f option and a rev
$ hg githelp -- git checkout -f xyz
hg update -C xyz
$ hg githelp -- git checkout --force xyz
hg update -C xyz
githelp for checkout with the -f option without an arg
$ hg githelp -- git checkout -f
hg revert --all
$ hg githelp -- git checkout --force
hg revert --all
githelp for grep with pattern and path
$ hg githelp -- grep shrubbery flib/intern/
hg grep shrubbery flib/intern/
githelp for reset, checking ~ in git becomes ~1 in mercurial
$ hg githelp -- reset HEAD~
hg update .~1
$ hg githelp -- reset "HEAD^"
hg update .^
$ hg githelp -- reset HEAD~3
hg update .~3
$ hg githelp -- reset --mixed HEAD
NOTE: --mixed has no meaning since Mercurial has no staging area
hg update .
$ hg githelp -- reset --soft HEAD
NOTE: --soft has no meaning since Mercurial has no staging area
hg update .
$ hg githelp -- reset --hard HEAD
hg update --clean .
githelp for git show --name-status
$ hg githelp -- git show --name-status
hg log --style status -r .
githelp for git show --pretty=format: --name-status
$ hg githelp -- git show --pretty=format: --name-status
hg status --change .
githelp for show with no arguments
$ hg githelp -- show
hg export
githelp for show with a path
$ hg githelp -- show test_file
hg cat test_file
githelp for show with not a path:
$ hg githelp -- show rev
hg export rev
githelp for show with many arguments
$ hg githelp -- show argone argtwo
hg export argone argtwo
$ hg githelp -- show test_file argone argtwo
hg cat test_file argone argtwo
githelp for show with --unified options
$ hg githelp -- show --unified=10
hg export --config diff.unified=10
$ hg githelp -- show -U100
hg export --config diff.unified=100
githelp for show with a path and --unified
$ hg githelp -- show -U20 test_file
hg cat test_file --config diff.unified=20
githelp for stash drop without name
$ hg githelp -- git stash drop
hg shelve -d <shelve name>
githelp for stash drop with name
$ hg githelp -- git stash drop xyz
hg shelve -d xyz
githelp for whatchanged should show deprecated message
$ hg githelp -- whatchanged -p
This command has been deprecated in the git project, thus isn't supported by this tool.
githelp for git branch -m renaming
$ hg githelp -- git branch -m old new
hg bookmark -m old new
When the old name is omitted, git branch -m new renames the current branch.
$ hg githelp -- git branch -m new
hg bookmark -m `hg log -T"{activebookmark}" -r .` new
Branch deletion in git strips commits
$ hg githelp -- git branch -d
hg strip -B
$ hg githelp -- git branch -d feature
hg strip -B feature -B
$ hg githelp -- git branch --delete experiment1 experiment2
hg strip -B experiment1 -B experiment2 -B
githelp for reuse message using the shorthand
$ hg githelp -- git commit -C deadbeef
hg commit -M deadbeef
githelp for reuse message using the the long version
$ hg githelp -- git commit --reuse-message deadbeef
hg commit -M deadbeef
githelp for apply with no options
$ hg githelp -- apply
hg import --no-commit
githelp for apply with directory strip custom
$ hg githelp -- apply -p 5
hg import --no-commit -p 5
git merge-base
$ hg githelp -- git merge-base --is-ancestor
ignoring unknown option --is-ancestor
NOTE: ancestors() is part of the revset language.
Learn more about revsets with 'hg help revsets'
hg log -T '{node}\n' -r 'ancestor(A,B)'
githelp for git blame
$ hg githelp -- git blame
hg annotate -udl
githelp for add
$ hg githelp -- git add
hg add
$ hg githelp -- git add -p
note: Mercurial will commit when complete, as there is no staging area in Mercurial
hg commit --interactive
$ hg githelp -- git add --all
note: use hg addremove to remove files that have been deleted.
hg add
githelp for reflog
$ hg githelp -- git reflog
hg journal
note: in hg commits can be deleted from repo but we always have backups.
$ hg githelp -- git reflog --all
hg journal --all
note: in hg commits can be deleted from repo but we always have backups.