##// END OF EJS Templates
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

File last commit:

r35722:41ef02ba default
r35994:48a3a928 default
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test-status-color.t
405 lines | 14.0 KiB | text/troff | Tads3Lexer
$ cat <<EOF >> $HGRCPATH
> [ui]
> color = always
> [color]
> mode = ansi
> EOF
Terminfo codes compatibility fix
$ echo "color.none=0" >> $HGRCPATH
$ hg init repo1
$ cd repo1
$ mkdir a b a/1 b/1 b/2
$ touch in_root a/in_a b/in_b a/1/in_a_1 b/1/in_b_1 b/2/in_b_2
hg status in repo root:
$ hg status
\x1b[0;35;1;4m? \x1b[0m\x1b[0;35;1;4ma/1/in_a_1\x1b[0m (esc)
\x1b[0;35;1;4m? \x1b[0m\x1b[0;35;1;4ma/in_a\x1b[0m (esc)
\x1b[0;35;1;4m? \x1b[0m\x1b[0;35;1;4mb/1/in_b_1\x1b[0m (esc)
\x1b[0;35;1;4m? \x1b[0m\x1b[0;35;1;4mb/2/in_b_2\x1b[0m (esc)
\x1b[0;35;1;4m? \x1b[0m\x1b[0;35;1;4mb/in_b\x1b[0m (esc)
\x1b[0;35;1;4m? \x1b[0m\x1b[0;35;1;4min_root\x1b[0m (esc)
$ hg status --color=debug
[status.unknown|? ][status.unknown|a/1/in_a_1]
[status.unknown|? ][status.unknown|a/in_a]
[status.unknown|? ][status.unknown|b/1/in_b_1]
[status.unknown|? ][status.unknown|b/2/in_b_2]
[status.unknown|? ][status.unknown|b/in_b]
[status.unknown|? ][status.unknown|in_root]
HGPLAIN disables color
$ HGPLAIN=1 hg status --color=debug
? a/1/in_a_1 (glob)
? a/in_a (glob)
? b/1/in_b_1 (glob)
? b/2/in_b_2 (glob)
? b/in_b (glob)
? in_root
HGPLAINEXCEPT=color does not disable color
$ HGPLAINEXCEPT=color hg status --color=debug
[status.unknown|? ][status.unknown|a/1/in_a_1] (glob)
[status.unknown|? ][status.unknown|a/in_a] (glob)
[status.unknown|? ][status.unknown|b/1/in_b_1] (glob)
[status.unknown|? ][status.unknown|b/2/in_b_2] (glob)
[status.unknown|? ][status.unknown|b/in_b] (glob)
[status.unknown|? ][status.unknown|in_root]
hg status with template
$ hg status -T "{label('red', path)}\n" --color=debug
[red|a/1/in_a_1]
[red|a/in_a]
[red|b/1/in_b_1]
[red|b/2/in_b_2]
[red|b/in_b]
[red|in_root]
hg status . in repo root:
$ hg status .
\x1b[0;35;1;4m? \x1b[0m\x1b[0;35;1;4ma/1/in_a_1\x1b[0m (esc)
\x1b[0;35;1;4m? \x1b[0m\x1b[0;35;1;4ma/in_a\x1b[0m (esc)
\x1b[0;35;1;4m? \x1b[0m\x1b[0;35;1;4mb/1/in_b_1\x1b[0m (esc)
\x1b[0;35;1;4m? \x1b[0m\x1b[0;35;1;4mb/2/in_b_2\x1b[0m (esc)
\x1b[0;35;1;4m? \x1b[0m\x1b[0;35;1;4mb/in_b\x1b[0m (esc)
\x1b[0;35;1;4m? \x1b[0m\x1b[0;35;1;4min_root\x1b[0m (esc)
$ hg status --cwd a
\x1b[0;35;1;4m? \x1b[0m\x1b[0;35;1;4ma/1/in_a_1\x1b[0m (esc)
\x1b[0;35;1;4m? \x1b[0m\x1b[0;35;1;4ma/in_a\x1b[0m (esc)
\x1b[0;35;1;4m? \x1b[0m\x1b[0;35;1;4mb/1/in_b_1\x1b[0m (esc)
\x1b[0;35;1;4m? \x1b[0m\x1b[0;35;1;4mb/2/in_b_2\x1b[0m (esc)
\x1b[0;35;1;4m? \x1b[0m\x1b[0;35;1;4mb/in_b\x1b[0m (esc)
\x1b[0;35;1;4m? \x1b[0m\x1b[0;35;1;4min_root\x1b[0m (esc)
$ hg status --cwd a .
\x1b[0;35;1;4m? \x1b[0m\x1b[0;35;1;4m1/in_a_1\x1b[0m (esc)
\x1b[0;35;1;4m? \x1b[0m\x1b[0;35;1;4min_a\x1b[0m (esc)
$ hg status --cwd a ..
\x1b[0;35;1;4m? \x1b[0m\x1b[0;35;1;4m1/in_a_1\x1b[0m (esc)
\x1b[0;35;1;4m? \x1b[0m\x1b[0;35;1;4min_a\x1b[0m (esc)
\x1b[0;35;1;4m? \x1b[0m\x1b[0;35;1;4m../b/1/in_b_1\x1b[0m (esc)
\x1b[0;35;1;4m? \x1b[0m\x1b[0;35;1;4m../b/2/in_b_2\x1b[0m (esc)
\x1b[0;35;1;4m? \x1b[0m\x1b[0;35;1;4m../b/in_b\x1b[0m (esc)
\x1b[0;35;1;4m? \x1b[0m\x1b[0;35;1;4m../in_root\x1b[0m (esc)
$ hg status --cwd b
\x1b[0;35;1;4m? \x1b[0m\x1b[0;35;1;4ma/1/in_a_1\x1b[0m (esc)
\x1b[0;35;1;4m? \x1b[0m\x1b[0;35;1;4ma/in_a\x1b[0m (esc)
\x1b[0;35;1;4m? \x1b[0m\x1b[0;35;1;4mb/1/in_b_1\x1b[0m (esc)
\x1b[0;35;1;4m? \x1b[0m\x1b[0;35;1;4mb/2/in_b_2\x1b[0m (esc)
\x1b[0;35;1;4m? \x1b[0m\x1b[0;35;1;4mb/in_b\x1b[0m (esc)
\x1b[0;35;1;4m? \x1b[0m\x1b[0;35;1;4min_root\x1b[0m (esc)
$ hg status --cwd b .
\x1b[0;35;1;4m? \x1b[0m\x1b[0;35;1;4m1/in_b_1\x1b[0m (esc)
\x1b[0;35;1;4m? \x1b[0m\x1b[0;35;1;4m2/in_b_2\x1b[0m (esc)
\x1b[0;35;1;4m? \x1b[0m\x1b[0;35;1;4min_b\x1b[0m (esc)
$ hg status --cwd b ..
\x1b[0;35;1;4m? \x1b[0m\x1b[0;35;1;4m../a/1/in_a_1\x1b[0m (esc)
\x1b[0;35;1;4m? \x1b[0m\x1b[0;35;1;4m../a/in_a\x1b[0m (esc)
\x1b[0;35;1;4m? \x1b[0m\x1b[0;35;1;4m1/in_b_1\x1b[0m (esc)
\x1b[0;35;1;4m? \x1b[0m\x1b[0;35;1;4m2/in_b_2\x1b[0m (esc)
\x1b[0;35;1;4m? \x1b[0m\x1b[0;35;1;4min_b\x1b[0m (esc)
\x1b[0;35;1;4m? \x1b[0m\x1b[0;35;1;4m../in_root\x1b[0m (esc)
$ hg status --cwd a/1
\x1b[0;35;1;4m? \x1b[0m\x1b[0;35;1;4ma/1/in_a_1\x1b[0m (esc)
\x1b[0;35;1;4m? \x1b[0m\x1b[0;35;1;4ma/in_a\x1b[0m (esc)
\x1b[0;35;1;4m? \x1b[0m\x1b[0;35;1;4mb/1/in_b_1\x1b[0m (esc)
\x1b[0;35;1;4m? \x1b[0m\x1b[0;35;1;4mb/2/in_b_2\x1b[0m (esc)
\x1b[0;35;1;4m? \x1b[0m\x1b[0;35;1;4mb/in_b\x1b[0m (esc)
\x1b[0;35;1;4m? \x1b[0m\x1b[0;35;1;4min_root\x1b[0m (esc)
$ hg status --cwd a/1 .
\x1b[0;35;1;4m? \x1b[0m\x1b[0;35;1;4min_a_1\x1b[0m (esc)
$ hg status --cwd a/1 ..
\x1b[0;35;1;4m? \x1b[0m\x1b[0;35;1;4min_a_1\x1b[0m (esc)
\x1b[0;35;1;4m? \x1b[0m\x1b[0;35;1;4m../in_a\x1b[0m (esc)
$ hg status --cwd b/1
\x1b[0;35;1;4m? \x1b[0m\x1b[0;35;1;4ma/1/in_a_1\x1b[0m (esc)
\x1b[0;35;1;4m? \x1b[0m\x1b[0;35;1;4ma/in_a\x1b[0m (esc)
\x1b[0;35;1;4m? \x1b[0m\x1b[0;35;1;4mb/1/in_b_1\x1b[0m (esc)
\x1b[0;35;1;4m? \x1b[0m\x1b[0;35;1;4mb/2/in_b_2\x1b[0m (esc)
\x1b[0;35;1;4m? \x1b[0m\x1b[0;35;1;4mb/in_b\x1b[0m (esc)
\x1b[0;35;1;4m? \x1b[0m\x1b[0;35;1;4min_root\x1b[0m (esc)
$ hg status --cwd b/1 .
\x1b[0;35;1;4m? \x1b[0m\x1b[0;35;1;4min_b_1\x1b[0m (esc)
$ hg status --cwd b/1 ..
\x1b[0;35;1;4m? \x1b[0m\x1b[0;35;1;4min_b_1\x1b[0m (esc)
\x1b[0;35;1;4m? \x1b[0m\x1b[0;35;1;4m../2/in_b_2\x1b[0m (esc)
\x1b[0;35;1;4m? \x1b[0m\x1b[0;35;1;4m../in_b\x1b[0m (esc)
$ hg status --cwd b/2
\x1b[0;35;1;4m? \x1b[0m\x1b[0;35;1;4ma/1/in_a_1\x1b[0m (esc)
\x1b[0;35;1;4m? \x1b[0m\x1b[0;35;1;4ma/in_a\x1b[0m (esc)
\x1b[0;35;1;4m? \x1b[0m\x1b[0;35;1;4mb/1/in_b_1\x1b[0m (esc)
\x1b[0;35;1;4m? \x1b[0m\x1b[0;35;1;4mb/2/in_b_2\x1b[0m (esc)
\x1b[0;35;1;4m? \x1b[0m\x1b[0;35;1;4mb/in_b\x1b[0m (esc)
\x1b[0;35;1;4m? \x1b[0m\x1b[0;35;1;4min_root\x1b[0m (esc)
$ hg status --cwd b/2 .
\x1b[0;35;1;4m? \x1b[0m\x1b[0;35;1;4min_b_2\x1b[0m (esc)
$ hg status --cwd b/2 ..
\x1b[0;35;1;4m? \x1b[0m\x1b[0;35;1;4m../1/in_b_1\x1b[0m (esc)
\x1b[0;35;1;4m? \x1b[0m\x1b[0;35;1;4min_b_2\x1b[0m (esc)
\x1b[0;35;1;4m? \x1b[0m\x1b[0;35;1;4m../in_b\x1b[0m (esc)
Make sure --color=never works
$ hg status --color=never
? a/1/in_a_1
? a/in_a
? b/1/in_b_1
? b/2/in_b_2
? b/in_b
? in_root
Make sure ui.formatted=False works
$ hg status --color=auto --config ui.formatted=False
? a/1/in_a_1
? a/in_a
? b/1/in_b_1
? b/2/in_b_2
? b/in_b
? in_root
$ cd ..
$ hg init repo2
$ cd repo2
$ touch modified removed deleted ignored
$ echo "^ignored$" > .hgignore
$ hg ci -A -m 'initial checkin'
adding .hgignore
adding deleted
adding modified
adding removed
$ hg log --color=debug
[log.changeset changeset.draft|changeset: 0:389aef86a55e]
[log.tag|tag: tip]
[log.user|user: test]
[log.date|date: Thu Jan 01 00:00:00 1970 +0000]
[log.summary|summary: initial checkin]
$ hg log -Tcompact --color=debug
[log.changeset changeset.draft|0][tip] [log.node|389aef86a55e] [log.date|1970-01-01 00:00 +0000] [log.user|test]
[ui.note log.description|initial checkin]
Labels on empty strings should not be displayed, labels on custom
templates should be.
$ hg log --color=debug -T '{label("my.label",author)}\n{label("skipped.label","")}'
[my.label|test]
$ touch modified added unknown ignored
$ hg add added
$ hg remove removed
$ rm deleted
hg status:
$ hg status
\x1b[0;32;1mA \x1b[0m\x1b[0;32;1madded\x1b[0m (esc)
\x1b[0;31;1mR \x1b[0m\x1b[0;31;1mremoved\x1b[0m (esc)
\x1b[0;36;1;4m! \x1b[0m\x1b[0;36;1;4mdeleted\x1b[0m (esc)
\x1b[0;35;1;4m? \x1b[0m\x1b[0;35;1;4munknown\x1b[0m (esc)
hg status modified added removed deleted unknown never-existed ignored:
$ hg status modified added removed deleted unknown never-existed ignored
never-existed: * (glob)
\x1b[0;32;1mA \x1b[0m\x1b[0;32;1madded\x1b[0m (esc)
\x1b[0;31;1mR \x1b[0m\x1b[0;31;1mremoved\x1b[0m (esc)
\x1b[0;36;1;4m! \x1b[0m\x1b[0;36;1;4mdeleted\x1b[0m (esc)
\x1b[0;35;1;4m? \x1b[0m\x1b[0;35;1;4munknown\x1b[0m (esc)
$ hg copy modified copied
hg status -C:
$ hg status -C
\x1b[0;32;1mA \x1b[0m\x1b[0;32;1madded\x1b[0m (esc)
\x1b[0;32;1mA \x1b[0m\x1b[0;32;1mcopied\x1b[0m (esc)
\x1b[0;0m modified\x1b[0m (esc)
\x1b[0;31;1mR \x1b[0m\x1b[0;31;1mremoved\x1b[0m (esc)
\x1b[0;36;1;4m! \x1b[0m\x1b[0;36;1;4mdeleted\x1b[0m (esc)
\x1b[0;35;1;4m? \x1b[0m\x1b[0;35;1;4munknown\x1b[0m (esc)
hg status -A:
$ hg status -A
\x1b[0;32;1mA \x1b[0m\x1b[0;32;1madded\x1b[0m (esc)
\x1b[0;32;1mA \x1b[0m\x1b[0;32;1mcopied\x1b[0m (esc)
\x1b[0;0m modified\x1b[0m (esc)
\x1b[0;31;1mR \x1b[0m\x1b[0;31;1mremoved\x1b[0m (esc)
\x1b[0;36;1;4m! \x1b[0m\x1b[0;36;1;4mdeleted\x1b[0m (esc)
\x1b[0;35;1;4m? \x1b[0m\x1b[0;35;1;4munknown\x1b[0m (esc)
\x1b[0;30;1mI \x1b[0m\x1b[0;30;1mignored\x1b[0m (esc)
\x1b[0;0mC \x1b[0m\x1b[0;0m.hgignore\x1b[0m (esc)
\x1b[0;0mC \x1b[0m\x1b[0;0mmodified\x1b[0m (esc)
hg status -A (with terminfo color):
#if tic
$ mkdir "$TESTTMP/terminfo"
$ TERMINFO="$TESTTMP/terminfo" tic "$TESTDIR/hgterm.ti"
$ TERM=hgterm TERMINFO="$TESTTMP/terminfo" hg status --config color.mode=terminfo -A
\x1b[30m\x1b[32m\x1b[1mA \x1b[30m\x1b[30m\x1b[32m\x1b[1madded\x1b[30m (esc)
\x1b[30m\x1b[32m\x1b[1mA \x1b[30m\x1b[30m\x1b[32m\x1b[1mcopied\x1b[30m (esc)
\x1b[30m\x1b[30m modified\x1b[30m (esc)
\x1b[30m\x1b[31m\x1b[1mR \x1b[30m\x1b[30m\x1b[31m\x1b[1mremoved\x1b[30m (esc)
\x1b[30m\x1b[36m\x1b[1m\x1b[4m! \x1b[30m\x1b[30m\x1b[36m\x1b[1m\x1b[4mdeleted\x1b[30m (esc)
\x1b[30m\x1b[35m\x1b[1m\x1b[4m? \x1b[30m\x1b[30m\x1b[35m\x1b[1m\x1b[4munknown\x1b[30m (esc)
\x1b[30m\x1b[30m\x1b[1mI \x1b[30m\x1b[30m\x1b[30m\x1b[1mignored\x1b[30m (esc)
\x1b[30m\x1b[30mC \x1b[30m\x1b[30m\x1b[30m.hgignore\x1b[30m (esc)
\x1b[30m\x1b[30mC \x1b[30m\x1b[30m\x1b[30mmodified\x1b[30m (esc)
The user can define effects with raw terminfo codes:
$ cat <<EOF >> $HGRCPATH
> # Completely bogus code for dim
> terminfo.dim = \E[88m
> # We can override what's in the terminfo database, too
> terminfo.bold = \E[2m
> EOF
$ TERM=hgterm TERMINFO="$TESTTMP/terminfo" hg status --config color.mode=terminfo --config color.status.clean=dim -A
\x1b[30m\x1b[32m\x1b[2mA \x1b[30m\x1b[30m\x1b[32m\x1b[2madded\x1b[30m (esc)
\x1b[30m\x1b[32m\x1b[2mA \x1b[30m\x1b[30m\x1b[32m\x1b[2mcopied\x1b[30m (esc)
\x1b[30m\x1b[30m modified\x1b[30m (esc)
\x1b[30m\x1b[31m\x1b[2mR \x1b[30m\x1b[30m\x1b[31m\x1b[2mremoved\x1b[30m (esc)
\x1b[30m\x1b[36m\x1b[2m\x1b[4m! \x1b[30m\x1b[30m\x1b[36m\x1b[2m\x1b[4mdeleted\x1b[30m (esc)
\x1b[30m\x1b[35m\x1b[2m\x1b[4m? \x1b[30m\x1b[30m\x1b[35m\x1b[2m\x1b[4munknown\x1b[30m (esc)
\x1b[30m\x1b[30m\x1b[2mI \x1b[30m\x1b[30m\x1b[30m\x1b[2mignored\x1b[30m (esc)
\x1b[30m\x1b[88mC \x1b[30m\x1b[30m\x1b[88m.hgignore\x1b[30m (esc)
\x1b[30m\x1b[88mC \x1b[30m\x1b[30m\x1b[88mmodified\x1b[30m (esc)
#endif
$ echo "^ignoreddir$" > .hgignore
$ mkdir ignoreddir
$ touch ignoreddir/file
hg status ignoreddir/file:
$ hg status ignoreddir/file
hg status -i ignoreddir/file:
$ hg status -i ignoreddir/file
\x1b[0;30;1mI \x1b[0m\x1b[0;30;1mignoreddir/file\x1b[0m (esc)
$ cd ..
check 'status -q' and some combinations
$ hg init repo3
$ cd repo3
$ touch modified removed deleted ignored
$ echo "^ignored$" > .hgignore
$ hg commit -A -m 'initial checkin'
adding .hgignore
adding deleted
adding modified
adding removed
$ touch added unknown ignored
$ hg add added
$ echo "test" >> modified
$ hg remove removed
$ rm deleted
$ hg copy modified copied
test unknown color
$ hg --config color.status.modified=periwinkle status
ignoring unknown color/effect 'periwinkle' (configured in color.status.modified)
ignoring unknown color/effect 'periwinkle' (configured in color.status.modified)
ignoring unknown color/effect 'periwinkle' (configured in color.status.modified)
M modified
\x1b[0;32;1mA \x1b[0m\x1b[0;32;1madded\x1b[0m (esc)
\x1b[0;32;1mA \x1b[0m\x1b[0;32;1mcopied\x1b[0m (esc)
\x1b[0;31;1mR \x1b[0m\x1b[0;31;1mremoved\x1b[0m (esc)
\x1b[0;36;1;4m! \x1b[0m\x1b[0;36;1;4mdeleted\x1b[0m (esc)
\x1b[0;35;1;4m? \x1b[0m\x1b[0;35;1;4munknown\x1b[0m (esc)
Run status with 2 different flags.
Check if result is the same or different.
If result is not as expected, raise error
$ assert() {
> hg status $1 > ../a
> hg status $2 > ../b
> if diff ../a ../b > /dev/null; then
> out=0
> else
> out=1
> fi
> if [ $3 -eq 0 ]; then
> df="same"
> else
> df="different"
> fi
> if [ $out -ne $3 ]; then
> echo "Error on $1 and $2, should be $df."
> fi
> }
assert flag1 flag2 [0-same | 1-different]
$ assert "-q" "-mard" 0
$ assert "-A" "-marduicC" 0
$ assert "-qA" "-mardcC" 0
$ assert "-qAui" "-A" 0
$ assert "-qAu" "-marducC" 0
$ assert "-qAi" "-mardicC" 0
$ assert "-qu" "-u" 0
$ assert "-q" "-u" 1
$ assert "-m" "-a" 1
$ assert "-r" "-d" 1
$ cd ..
test 'resolve -l'
$ hg init repo4
$ cd repo4
$ echo "file a" > a
$ echo "file b" > b
$ hg add a b
$ hg commit -m "initial"
$ echo "file a change 1" > a
$ echo "file b change 1" > b
$ hg commit -m "head 1"
$ hg update 0
2 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ echo "file a change 2" > a
$ echo "file b change 2" > b
$ hg commit -m "head 2"
created new head
$ hg merge
merging a
merging b
warning: conflicts while merging a! (edit, then use 'hg resolve --mark')
warning: conflicts while merging b! (edit, then use 'hg resolve --mark')
0 files updated, 0 files merged, 0 files removed, 2 files unresolved
use 'hg resolve' to retry unresolved file merges or 'hg merge --abort' to abandon
[1]
$ hg resolve -m b
hg resolve with one unresolved, one resolved:
$ hg resolve -l
\x1b[0;31;1mU \x1b[0m\x1b[0;31;1ma\x1b[0m (esc)
\x1b[0;32;1mR \x1b[0m\x1b[0;32;1mb\x1b[0m (esc)
color coding of error message with current availability of curses
$ hg unknowncommand > /dev/null
hg: unknown command 'unknowncommand'
[255]
color coding of error message without curses
$ echo 'raise ImportError' > curses.py
$ PYTHONPATH=`pwd`:$PYTHONPATH hg unknowncommand > /dev/null
hg: unknown command 'unknowncommand'
[255]
$ cd ..