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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-remove.t
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$ remove() {
> hg rm $@
> echo "exit code: $?"
> hg st
> # do not use ls -R, which recurses in .hg subdirs on Mac OS X 10.5
> find . -name .hg -prune -o -type f -print | sort
> hg up -C
> }
$ cat >> $HGRCPATH <<EOF
> [progress]
> disable=False
> assume-tty = 1
> delay = 0
> # set changedelay really large so we don't see nested topics
> changedelay = 30000
> format = topic bar number
> refresh = 0
> width = 60
> EOF
$ hg init a
$ cd a
$ echo a > foo
file not managed
$ remove foo
\r (no-eol) (esc)
deleting [===========================================>] 1/1\r (no-eol) (esc)
\r (no-eol) (esc)
not removing foo: file is untracked
exit code: 1
? foo
./foo
0 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ hg add foo
$ hg commit -m1
the table cases
00 state added, options none
$ echo b > bar
$ hg add bar
$ remove bar
\r (no-eol) (esc)
deleting [===========================================>] 1/1\r (no-eol) (esc)
\r (no-eol) (esc)
\r (no-eol) (esc)
skipping [===========================================>] 1/1\r (no-eol) (esc)
\r (no-eol) (esc)
not removing bar: file has been marked for add (use 'hg forget' to undo add)
exit code: 1
A bar
./bar
./foo
\r (no-eol) (esc)
updating [===========================================>] 1/1\r (no-eol) (esc)
\r (no-eol) (esc)
0 files updated, 0 files merged, 0 files removed, 0 files unresolved
01 state clean, options none
$ remove foo
\r (no-eol) (esc)
deleting [===========================================>] 1/1\r (no-eol) (esc)
\r (no-eol) (esc)
exit code: 0
R foo
? bar
./bar
\r (no-eol) (esc)
updating [===========================================>] 1/1\r (no-eol) (esc)
\r (no-eol) (esc)
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
02 state modified, options none
$ echo b >> foo
$ remove foo
\r (no-eol) (esc)
deleting [===========================================>] 1/1\r (no-eol) (esc)
\r (no-eol) (esc)
\r (no-eol) (esc)
skipping [===========================================>] 1/1\r (no-eol) (esc)
\r (no-eol) (esc)
not removing foo: file is modified (use -f to force removal)
exit code: 1
M foo
? bar
./bar
./foo
\r (no-eol) (esc)
updating [===========================================>] 1/1\r (no-eol) (esc)
\r (no-eol) (esc)
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
03 state missing, options none
$ rm foo
$ remove foo
\r (no-eol) (esc)
deleting [===========================================>] 1/1\r (no-eol) (esc)
\r (no-eol) (esc)
exit code: 0
R foo
? bar
./bar
\r (no-eol) (esc)
updating [===========================================>] 1/1\r (no-eol) (esc)
\r (no-eol) (esc)
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
10 state added, options -f
$ echo b > bar
$ hg add bar
$ remove -f bar
\r (no-eol) (esc)
deleting [===========================================>] 1/1\r (no-eol) (esc)
\r (no-eol) (esc)
exit code: 0
? bar
./bar
./foo
0 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ rm bar
11 state clean, options -f
$ remove -f foo
\r (no-eol) (esc)
deleting [===========================================>] 1/1\r (no-eol) (esc)
\r (no-eol) (esc)
exit code: 0
R foo
\r (no-eol) (esc)
updating [===========================================>] 1/1\r (no-eol) (esc)
\r (no-eol) (esc)
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
12 state modified, options -f
$ echo b >> foo
$ remove -f foo
\r (no-eol) (esc)
deleting [===========================================>] 1/1\r (no-eol) (esc)
\r (no-eol) (esc)
exit code: 0
R foo
\r (no-eol) (esc)
updating [===========================================>] 1/1\r (no-eol) (esc)
\r (no-eol) (esc)
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
13 state missing, options -f
$ rm foo
$ remove -f foo
\r (no-eol) (esc)
deleting [===========================================>] 1/1\r (no-eol) (esc)
\r (no-eol) (esc)
exit code: 0
R foo
\r (no-eol) (esc)
updating [===========================================>] 1/1\r (no-eol) (esc)
\r (no-eol) (esc)
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
20 state added, options -A
$ echo b > bar
$ hg add bar
$ remove -A bar
\r (no-eol) (esc)
deleting [===========================================>] 1/1\r (no-eol) (esc)
\r (no-eol) (esc)
\r (no-eol) (esc)
skipping [===========================================>] 1/1\r (no-eol) (esc)
\r (no-eol) (esc)
not removing bar: file still exists
exit code: 1
A bar
./bar
./foo
\r (no-eol) (esc)
updating [===========================================>] 1/1\r (no-eol) (esc)
\r (no-eol) (esc)
0 files updated, 0 files merged, 0 files removed, 0 files unresolved
21 state clean, options -Av
$ remove -Av foo
\r (no-eol) (esc)
deleting [===========================================>] 1/1\r (no-eol) (esc)
\r (no-eol) (esc)
\r (no-eol) (esc)
skipping [===========================================>] 1/1\r (no-eol) (esc)
\r (no-eol) (esc)
not removing foo: file still exists
exit code: 1
? bar
./bar
./foo
0 files updated, 0 files merged, 0 files removed, 0 files unresolved
22 state modified, options -Av
$ echo b >> foo
$ remove -Av foo
\r (no-eol) (esc)
deleting [===========================================>] 1/1\r (no-eol) (esc)
\r (no-eol) (esc)
\r (no-eol) (esc)
skipping [===========================================>] 1/1\r (no-eol) (esc)
\r (no-eol) (esc)
not removing foo: file still exists
exit code: 1
M foo
? bar
./bar
./foo
\r (no-eol) (esc)
updating [===========================================>] 1/1\r (no-eol) (esc)
\r (no-eol) (esc)
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
23 state missing, options -A
$ rm foo
$ remove -A foo
\r (no-eol) (esc)
deleting [===========================================>] 1/1\r (no-eol) (esc)
\r (no-eol) (esc)
exit code: 0
R foo
? bar
./bar
\r (no-eol) (esc)
updating [===========================================>] 1/1\r (no-eol) (esc)
\r (no-eol) (esc)
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
30 state added, options -Af
$ echo b > bar
$ hg add bar
$ remove -Af bar
\r (no-eol) (esc)
deleting [===========================================>] 1/1\r (no-eol) (esc)
\r (no-eol) (esc)
exit code: 0
? bar
./bar
./foo
0 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ rm bar
31 state clean, options -Af
$ remove -Af foo
\r (no-eol) (esc)
deleting [===========================================>] 1/1\r (no-eol) (esc)
\r (no-eol) (esc)
exit code: 0
R foo
./foo
\r (no-eol) (esc)
updating [===========================================>] 1/1\r (no-eol) (esc)
\r (no-eol) (esc)
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
32 state modified, options -Af
$ echo b >> foo
$ remove -Af foo
\r (no-eol) (esc)
deleting [===========================================>] 1/1\r (no-eol) (esc)
\r (no-eol) (esc)
exit code: 0
R foo
./foo
\r (no-eol) (esc)
updating [===========================================>] 1/1\r (no-eol) (esc)
\r (no-eol) (esc)
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
33 state missing, options -Af
$ rm foo
$ remove -Af foo
\r (no-eol) (esc)
deleting [===========================================>] 1/1\r (no-eol) (esc)
\r (no-eol) (esc)
exit code: 0
R foo
\r (no-eol) (esc)
updating [===========================================>] 1/1\r (no-eol) (esc)
\r (no-eol) (esc)
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
test some directory stuff
$ mkdir test
$ echo a > test/foo
$ echo b > test/bar
$ hg ci -Am2
adding test/bar
adding test/foo
dir, options none
$ rm test/bar
$ remove test
\r (no-eol) (esc)
deleting [===========================================>] 1/1\r (no-eol) (esc)
\r (no-eol) (esc)
\r (no-eol) (esc)
deleting [=====================> ] 1/2\r (no-eol) (esc)
\r (no-eol) (esc)
\r (no-eol) (esc)
deleting [===========================================>] 2/2\r (no-eol) (esc)
\r (no-eol) (esc)
removing test/bar
removing test/foo
exit code: 0
R test/bar
R test/foo
./foo
\r (no-eol) (esc)
updating [===========================================>] 2/2\r (no-eol) (esc)
\r (no-eol) (esc)
2 files updated, 0 files merged, 0 files removed, 0 files unresolved
dir, options -f
$ rm test/bar
$ remove -f test
\r (no-eol) (esc)
deleting [===========================================>] 1/1\r (no-eol) (esc)
\r (no-eol) (esc)
\r (no-eol) (esc)
deleting [=====================> ] 1/2\r (no-eol) (esc)
\r (no-eol) (esc)
\r (no-eol) (esc)
deleting [===========================================>] 2/2\r (no-eol) (esc)
\r (no-eol) (esc)
removing test/bar
removing test/foo
exit code: 0
R test/bar
R test/foo
./foo
\r (no-eol) (esc)
updating [===========================================>] 2/2\r (no-eol) (esc)
\r (no-eol) (esc)
2 files updated, 0 files merged, 0 files removed, 0 files unresolved
dir, options -Av
$ rm test/bar
$ remove -Av test
\r (no-eol) (esc)
deleting [===========================================>] 1/1\r (no-eol) (esc)
\r (no-eol) (esc)
\r (no-eol) (esc)
skipping [===========================================>] 1/1\r (no-eol) (esc)
\r (no-eol) (esc)
\r (no-eol) (esc)
deleting [===========================================>] 1/1\r (no-eol) (esc)
\r (no-eol) (esc)
removing test/bar
not removing test/foo: file still exists
exit code: 1
R test/bar
./foo
./test/foo
\r (no-eol) (esc)
updating [===========================================>] 1/1\r (no-eol) (esc)
\r (no-eol) (esc)
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
dir, options -A <dir>
$ rm test/bar
$ remove -A test
\r (no-eol) (esc)
deleting [===========================================>] 1/1\r (no-eol) (esc)
\r (no-eol) (esc)
\r (no-eol) (esc)
skipping [===========================================>] 1/1\r (no-eol) (esc)
\r (no-eol) (esc)
\r (no-eol) (esc)
deleting [===========================================>] 1/1\r (no-eol) (esc)
\r (no-eol) (esc)
removing test/bar
exit code: 1
R test/bar
./foo
./test/foo
\r (no-eol) (esc)
updating [===========================================>] 1/1\r (no-eol) (esc)
\r (no-eol) (esc)
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
without any files/dirs, options -A
$ rm test/bar
$ remove -A
\r (no-eol) (esc)
skipping [=====================> ] 1/2\r (no-eol) (esc)
skipping [===========================================>] 2/2\r (no-eol) (esc)
\r (no-eol) (esc)
\r (no-eol) (esc)
deleting [===========================================>] 1/1\r (no-eol) (esc)
\r (no-eol) (esc)
removing test/bar
exit code: 1
R test/bar
./foo
./test/foo
\r (no-eol) (esc)
updating [===========================================>] 1/1\r (no-eol) (esc)
\r (no-eol) (esc)
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
dir, options -Af
$ rm test/bar
$ remove -Af test
\r (no-eol) (esc)
deleting [===========================================>] 1/1\r (no-eol) (esc)
\r (no-eol) (esc)
\r (no-eol) (esc)
deleting [=====================> ] 1/2\r (no-eol) (esc)
\r (no-eol) (esc)
\r (no-eol) (esc)
deleting [===========================================>] 2/2\r (no-eol) (esc)
\r (no-eol) (esc)
removing test/bar
removing test/foo
exit code: 0
R test/bar
R test/foo
./foo
./test/foo
\r (no-eol) (esc)
updating [===========================================>] 2/2\r (no-eol) (esc)
\r (no-eol) (esc)
2 files updated, 0 files merged, 0 files removed, 0 files unresolved
test remove dropping empty trees (issue1861)
$ mkdir -p issue1861/b/c
$ echo x > issue1861/x
$ echo y > issue1861/b/c/y
$ hg ci -Am add
adding issue1861/b/c/y
adding issue1861/x
$ hg rm issue1861/b
\r (no-eol) (esc)
deleting [===========================================>] 1/1\r (no-eol) (esc)
\r (no-eol) (esc)
\r (no-eol) (esc)
deleting [===========================================>] 1/1\r (no-eol) (esc)
\r (no-eol) (esc)
removing issue1861/b/c/y
$ hg ci -m remove
$ ls issue1861
x
test that commit does not crash if the user removes a newly added file
$ touch f1
$ hg add f1
$ rm f1
$ hg ci -A -mx
removing f1
nothing changed
[1]
handling of untracked directories and missing files
$ mkdir d1
$ echo a > d1/a
$ hg rm --after d1
\r (no-eol) (esc)
deleting [===========================================>] 1/1\r (no-eol) (esc)
\r (no-eol) (esc)
not removing d1: no tracked files
[1]
$ hg add d1/a
$ rm d1/a
$ hg rm --after d1
\r (no-eol) (esc)
deleting [===========================================>] 1/1\r (no-eol) (esc)
\r (no-eol) (esc)
\r (no-eol) (esc)
deleting [===========================================>] 1/1\r (no-eol) (esc)
\r (no-eol) (esc)
removing d1/a
$ hg rm --after nosuch
nosuch: * (glob)
\r (no-eol) (esc)
deleting [===========================================>] 1/1\r (no-eol) (esc)
\r (no-eol) (esc)
[1]