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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-fileset.t
670 lines | 12.3 KiB | text/troff | Tads3Lexer
$ fileset() {
> hg debugfileset "$@"
> }
$ hg init repo
$ cd repo
$ echo a > a1
$ echo a > a2
$ echo b > b1
$ echo b > b2
$ hg ci -Am addfiles
adding a1
adding a2
adding b1
adding b2
Test operators and basic patterns
$ fileset -v a1
(symbol 'a1')
a1
$ fileset -v 'a*'
(symbol 'a*')
a1
a2
$ fileset -v '"re:a\d"'
(string 're:a\\d')
a1
a2
$ fileset -v '!re:"a\d"'
(not
(kindpat
(symbol 're')
(string 'a\\d')))
b1
b2
$ fileset -v 'path:a1 or glob:b?'
(or
(kindpat
(symbol 'path')
(symbol 'a1'))
(kindpat
(symbol 'glob')
(symbol 'b?')))
a1
b1
b2
$ fileset -v 'a1 or a2'
(or
(symbol 'a1')
(symbol 'a2'))
a1
a2
$ fileset 'a1 | a2'
a1
a2
$ fileset 'a* and "*1"'
a1
$ fileset 'a* & "*1"'
a1
$ fileset 'not (r"a*")'
b1
b2
$ fileset '! ("a*")'
b1
b2
$ fileset 'a* - a1'
a2
$ fileset 'a_b'
$ fileset '"\xy"'
hg: parse error: invalid \x escape
[255]
Test invalid syntax
$ fileset -v '"added"()'
(func
(string 'added')
None)
hg: parse error: not a symbol
[255]
$ fileset -v '()()'
(func
(group
None)
None)
hg: parse error: not a symbol
[255]
$ fileset -v -- '-x'
(negate
(symbol 'x'))
hg: parse error: can't use negate operator in this context
[255]
$ fileset -v -- '-()'
(negate
(group
None))
hg: parse error: can't use negate operator in this context
[255]
$ fileset '"path":.'
hg: parse error: not a symbol
[255]
$ fileset 'path:foo bar'
hg: parse error at 9: invalid token
[255]
$ fileset 'foo:bar:baz'
hg: parse error: not a symbol
[255]
$ fileset 'foo:bar()'
hg: parse error: pattern must be a string
[255]
$ fileset 'foo:bar'
hg: parse error: invalid pattern kind: foo
[255]
Test files status
$ rm a1
$ hg rm a2
$ echo b >> b2
$ hg cp b1 c1
$ echo c > c2
$ echo c > c3
$ cat > .hgignore <<EOF
> \.hgignore
> 2$
> EOF
$ fileset 'modified()'
b2
$ fileset 'added()'
c1
$ fileset 'removed()'
a2
$ fileset 'deleted()'
a1
$ fileset 'missing()'
a1
$ fileset 'unknown()'
c3
$ fileset 'ignored()'
.hgignore
c2
$ fileset 'hgignore()'
a2
b2
$ fileset 'clean()'
b1
$ fileset 'copied()'
c1
Test files status in different revisions
$ hg status -m
M b2
$ fileset -r0 'revs("wdir()", modified())' --traceback
b2
$ hg status -a
A c1
$ fileset -r0 'revs("wdir()", added())'
c1
$ hg status --change 0 -a
A a1
A a2
A b1
A b2
$ hg status -mru
M b2
R a2
? c3
$ fileset -r0 'added() and revs("wdir()", modified() or removed() or unknown())'
b2
a2
$ fileset -r0 'added() or revs("wdir()", added())'
a1
a2
b1
b2
c1
Test files properties
>>> file('bin', 'wb').write('\0a')
$ fileset 'binary()'
$ fileset 'binary() and unknown()'
bin
$ echo '^bin$' >> .hgignore
$ fileset 'binary() and ignored()'
bin
$ hg add bin
$ fileset 'binary()'
bin
$ fileset 'grep("b{1}")'
b2
c1
b1
$ fileset 'grep("missingparens(")'
hg: parse error: invalid match pattern: unbalanced parenthesis
[255]
#if execbit
$ chmod +x b2
$ fileset 'exec()'
b2
#endif
#if symlink
$ ln -s b2 b2link
$ fileset 'symlink() and unknown()'
b2link
$ hg add b2link
#endif
#if no-windows
$ echo foo > con.xml
$ fileset 'not portable()'
con.xml
$ hg --config ui.portablefilenames=ignore add con.xml
#endif
>>> file('1k', 'wb').write(' '*1024)
>>> file('2k', 'wb').write(' '*2048)
$ hg add 1k 2k
$ fileset 'size("bar")'
hg: parse error: couldn't parse size: bar
[255]
$ fileset '(1k, 2k)'
hg: parse error: can't use a list in this context
(see hg help "filesets.x or y")
[255]
$ fileset 'size(1k)'
1k
$ fileset '(1k or 2k) and size("< 2k")'
1k
$ fileset '(1k or 2k) and size("<=2k")'
1k
2k
$ fileset '(1k or 2k) and size("> 1k")'
2k
$ fileset '(1k or 2k) and size(">=1K")'
1k
2k
$ fileset '(1k or 2k) and size(".5KB - 1.5kB")'
1k
$ fileset 'size("1M")'
$ fileset 'size("1 GB")'
Test merge states
$ hg ci -m manychanges
$ hg up -C 0
* files updated, 0 files merged, * files removed, 0 files unresolved (glob)
$ echo c >> b2
$ hg ci -m diverging b2
created new head
$ fileset 'resolved()'
$ fileset 'unresolved()'
$ hg merge
merging b2
warning: conflicts while merging b2! (edit, then use 'hg resolve --mark')
* files updated, 0 files merged, 1 files removed, 1 files unresolved (glob)
use 'hg resolve' to retry unresolved file merges or 'hg merge --abort' to abandon
[1]
$ fileset 'resolved()'
$ fileset 'unresolved()'
b2
$ echo e > b2
$ hg resolve -m b2
(no more unresolved files)
$ fileset 'resolved()'
b2
$ fileset 'unresolved()'
$ hg ci -m merge
Test subrepo predicate
$ hg init sub
$ echo a > sub/suba
$ hg -R sub add sub/suba
$ hg -R sub ci -m sub
$ echo 'sub = sub' > .hgsub
$ hg init sub2
$ echo b > sub2/b
$ hg -R sub2 ci -Am sub2
adding b
$ echo 'sub2 = sub2' >> .hgsub
$ fileset 'subrepo()'
$ hg add .hgsub
$ fileset 'subrepo()'
sub
sub2
$ fileset 'subrepo("sub")'
sub
$ fileset 'subrepo("glob:*")'
sub
sub2
$ hg ci -m subrepo
Test that .hgsubstate is updated as appropriate during a conversion. The
saverev property is enough to alter the hashes of the subrepo.
$ hg init ../converted
$ hg --config extensions.convert= convert --config convert.hg.saverev=True \
> sub ../converted/sub
initializing destination ../converted/sub repository
scanning source...
sorting...
converting...
0 sub
$ hg clone -U sub2 ../converted/sub2
$ hg --config extensions.convert= convert --config convert.hg.saverev=True \
> . ../converted
scanning source...
sorting...
converting...
4 addfiles
3 manychanges
2 diverging
1 merge
0 subrepo
no ".hgsubstate" updates will be made for "sub2"
$ hg up -q -R ../converted -r tip
$ hg --cwd ../converted cat sub/suba sub2/b -r tip
a
b
$ oldnode=`hg log -r tip -T "{node}\n"`
$ newnode=`hg log -R ../converted -r tip -T "{node}\n"`
$ [ "$oldnode" != "$newnode" ] || echo "nothing changed"
Test with a revision
$ hg log -G --template '{rev} {desc}\n'
@ 4 subrepo
|
o 3 merge
|\
| o 2 diverging
| |
o | 1 manychanges
|/
o 0 addfiles
$ echo unknown > unknown
$ fileset -r1 'modified()'
b2
$ fileset -r1 'added() and c1'
c1
$ fileset -r1 'removed()'
a2
$ fileset -r1 'deleted()'
$ fileset -r1 'unknown()'
$ fileset -r1 'ignored()'
$ fileset -r1 'hgignore()'
b2
bin
$ fileset -r1 'binary()'
bin
$ fileset -r1 'size(1k)'
1k
$ fileset -r3 'resolved()'
$ fileset -r3 'unresolved()'
#if execbit
$ fileset -r1 'exec()'
b2
#endif
#if symlink
$ fileset -r1 'symlink()'
b2link
#endif
#if no-windows
$ fileset -r1 'not portable()'
con.xml
$ hg forget 'con.xml'
#endif
$ fileset -r4 'subrepo("re:su.*")'
sub
sub2
$ fileset -r4 'subrepo(re:su.*)'
sub
sub2
$ fileset -r4 'subrepo("sub")'
sub
$ fileset -r4 'b2 or c1'
b2
c1
>>> open('dos', 'wb').write("dos\r\n")
>>> open('mixed', 'wb').write("dos\r\nunix\n")
>>> open('mac', 'wb').write("mac\r")
$ hg add dos mixed mac
(remove a1, to examine safety of 'eol' on removed files)
$ rm a1
$ fileset 'eol(dos)'
dos
mixed
$ fileset 'eol(unix)'
mixed
.hgsub
.hgsubstate
b1
b2
c1
$ fileset 'eol(mac)'
mac
Test safety of 'encoding' on removed files
$ fileset 'encoding("ascii")'
dos
mac
mixed
.hgsub
.hgsubstate
1k
2k
b1
b2
b2link (symlink !)
bin
c1
Test detection of unintentional 'matchctx.existing()' invocation
$ cat > $TESTTMP/existingcaller.py <<EOF
> from mercurial import registrar
>
> filesetpredicate = registrar.filesetpredicate()
> @filesetpredicate('existingcaller()', callexisting=False)
> def existingcaller(mctx, x):
> # this 'mctx.existing()' invocation is unintentional
> return [f for f in mctx.existing()]
> EOF
$ cat >> .hg/hgrc <<EOF
> [extensions]
> existingcaller = $TESTTMP/existingcaller.py
> EOF
$ fileset 'existingcaller()' 2>&1 | tail -1
AssertionError: unexpected existing() invocation
Test 'revs(...)'
================
small reminder of the repository state
$ hg log -G
@ changeset: 4:* (glob)
| tag: tip
| user: test
| date: Thu Jan 01 00:00:00 1970 +0000
| summary: subrepo
|
o changeset: 3:* (glob)
|\ parent: 2:55b05bdebf36
| | parent: 1:* (glob)
| | user: test
| | date: Thu Jan 01 00:00:00 1970 +0000
| | summary: merge
| |
| o changeset: 2:55b05bdebf36
| | parent: 0:8a9576c51c1f
| | user: test
| | date: Thu Jan 01 00:00:00 1970 +0000
| | summary: diverging
| |
o | changeset: 1:* (glob)
|/ user: test
| date: Thu Jan 01 00:00:00 1970 +0000
| summary: manychanges
|
o changeset: 0:8a9576c51c1f
user: test
date: Thu Jan 01 00:00:00 1970 +0000
summary: addfiles
$ hg status --change 0
A a1
A a2
A b1
A b2
$ hg status --change 1
M b2
A 1k
A 2k
A b2link (no-windows !)
A bin
A c1
A con.xml (no-windows !)
R a2
$ hg status --change 2
M b2
$ hg status --change 3
M b2
A 1k
A 2k
A b2link (no-windows !)
A bin
A c1
A con.xml (no-windows !)
R a2
$ hg status --change 4
A .hgsub
A .hgsubstate
$ hg status
A dos
A mac
A mixed
R con.xml (no-windows !)
! a1
? b2.orig
? c3
? unknown
Test files at -r0 should be filtered by files at wdir
-----------------------------------------------------
$ fileset -r0 '* and revs("wdir()", *)'
a1
b1
b2
Test that "revs()" work at all
------------------------------
$ fileset "revs('2', modified())"
b2
Test that "revs()" work for file missing in the working copy/current context
----------------------------------------------------------------------------
(a2 not in working copy)
$ fileset "revs('0', added())"
a1
a2
b1
b2
(none of the file exist in "0")
$ fileset -r 0 "revs('4', added())"
.hgsub
.hgsubstate
Call with empty revset
--------------------------
$ fileset "revs('2-2', modified())"
Call with revset matching multiple revs
---------------------------------------
$ fileset "revs('0+4', added())"
a1
a2
b1
b2
.hgsub
.hgsubstate
overlapping set
$ fileset "revs('1+2', modified())"
b2
test 'status(...)'
=================
Simple case
-----------
$ fileset "status(3, 4, added())"
.hgsub
.hgsubstate
use rev to restrict matched file
-----------------------------------------
$ hg status --removed --rev 0 --rev 1
R a2
$ fileset "status(0, 1, removed())"
a2
$ fileset "* and status(0, 1, removed())"
$ fileset -r 4 "status(0, 1, removed())"
a2
$ fileset -r 4 "* and status(0, 1, removed())"
$ fileset "revs('4', * and status(0, 1, removed()))"
$ fileset "revs('0', * and status(0, 1, removed()))"
a2
check wdir()
------------
$ hg status --removed --rev 4
R con.xml (no-windows !)
$ fileset "status(4, 'wdir()', removed())"
con.xml (no-windows !)
$ hg status --removed --rev 2
R a2
$ fileset "status('2', 'wdir()', removed())"
a2
test backward status
--------------------
$ hg status --removed --rev 0 --rev 4
R a2
$ hg status --added --rev 4 --rev 0
A a2
$ fileset "status(4, 0, added())"
a2
test cross branch status
------------------------
$ hg status --added --rev 1 --rev 2
A a2
$ fileset "status(1, 2, added())"
a2
test with multi revs revset
---------------------------
$ hg status --added --rev 0:1 --rev 3:4
A .hgsub
A .hgsubstate
A 1k
A 2k
A b2link (no-windows !)
A bin
A c1
A con.xml (no-windows !)
$ fileset "status('0:1', '3:4', added())"
.hgsub
.hgsubstate
1k
2k
b2link (no-windows !)
bin
c1
con.xml (no-windows !)
tests with empty value
----------------------
Fully empty revset
$ fileset "status('', '4', added())"
hg: parse error: first argument to status must be a revision
[255]
$ fileset "status('2', '', added())"
hg: parse error: second argument to status must be a revision
[255]
Empty revset will error at the revset layer
$ fileset "status(' ', '4', added())"
hg: parse error at 1: not a prefix: end
[255]
$ fileset "status('2', ' ', added())"
hg: parse error at 1: not a prefix: end
[255]