pushoperation: fix language issues in docstring

chg: do not write pidfile Current pidfile logic will only keep the pid of the newest server, which is not very useful if we want to kill all servers, and will become outdated if the server auto exits after being idle for too long. Besides, the server-side pidfile writing logic runs before chgserver gets confighash so it's not trivial to append confighash to pidfile basename like we did for socket file. This patch removes --pidfile from the command starting chgserver and switches to an alternative way (unlink socket file) to stop the server.

chg: remove manual reload logic chgserver now validates and reloads configs automatically. Manually reloading is no longer necessary. Besides, we are deprecating pid files since the server will periodically check its ownership of the socket file and exit if it does not own the socket file any longer, which works more reliable than a pid file. This patch removes the SIGHUP reload logic from both chg server and client.

chg: use --daemon-postexec chdir:/ instead of --cwd / The chgserver is designed to load repo config from current directory. "--cwd /" will prevent chgserver from loading repo config and generate a wrong confighash, which will result in a redirect loop. This patch removes "--cwd /" and uses "--daemon-postexec chdir:/" instead.

serve: add chdir command for --daemon-postexec For chgserver, it probably needs a chdir to /. This patch adds chdir command support for --daemon-postexec so chg client can make use of it.

serve: accept multiple values for --daemon-postexec The next patch will add another postexec command: chdir, which can be used together with unlink. This patch changes the option type of --daemon-postexec from string to list to accept multiple commands. The error message of invalid --daemon-postexec value is also changed to include the actual invalid value.

hgext: officially turn 'hgext' into a namespace package Actually since Python 2.3, there is some way to turn top level package into "namespace package" so that multiple subpackage installed in different part of the path can still be imported transparently. This feature was previously thought (at least by myself) to be only provided by some setuptool black magic. Turning hgext into such namespace package allows third extensions to install themselves inside the "hgext" namespace package to avoid polluting the global python module namespace. They will now be able to do so without making it a pain to use a Mercurial "installed" in a different way/location than these extensions. The only constrains is that the extension ship a 'hgext/__init__.py' containing the same call to 'pkgutil.extend_path' and nothing else. This seems realistic. The main question that remains is: should we introduce a dedicated namespace for third party extension (hgext3rd?) to make a clearer distinction between what is officially supported and what is not? If so, this will be introduced in a follow up patch.