hgext/logtoprocess.py

zstd: vendor zstd 1.1.1

zstd is a new compression format and it is awesome, yielding
higher compression ratios and significantly faster compression
and decompression operations compared to zlib (our current
compression engine of choice) across the board.

We want zstd to be a 1st class citizen in Mercurial and to eventually
be the preferred compression format for various operations.

This patch starts the formal process of supporting zstd by vendoring
a copy of zstd. Why do we need to vendor zstd? Good question.

First, zstd is relatively new and not widely available yet. If we
didn't vendor zstd or distribute it with Mercurial, most users likely
wouldn't have zstd installed or even available to install. What good
is a feature if you can't use it? Vendoring and distributing the zstd
sources gives us the highest liklihood that zstd will be available to
Mercurial installs.

Second, the Python bindings to zstd (which will be vendored in a
separate changeset) make use of zstd APIs that are only available
via static linking. One reason they are only available via static
linking is that they are unstable and could change at any time.
While it might be possible for the Python bindings to attempt to
talk to different versions of the zstd C library, the safest thing to
do is link against a specific, known-working version of zstd. This
is why the Python zstd bindings themselves vendor zstd and why we
must as well. This also explains why the added files are in a
"python-zstandard" directory.

The added files are from the 1.1.1 release of zstd (Git commit
4c0b44f8ced84c4c8edfa07b564d31e4fa3e8885 from
https://github.com/facebook/zstd) and are added without modifications.
Not all files from the zstd "distribution" have been added. Notably
missing are files to support interacting with "legacy," pre-1.0
versions of zstd. The decision of which files to include is made by
the upstream python-zstandard project (which I'm the author of). The
files in this commit are a snapshot of the files from the 0.5.0
release of that project, Git commit
e637c1b214d5f869cf8116c550dcae23ec13b677 from
https://github.com/indygreg/python-zstandard.

# logtoprocess.py - send ui.log() data to a subprocess
#
# Copyright 2016 Facebook, Inc.
#
# This software may be used and distributed according to the terms of the
# GNU General Public License version 2 or any later version.
"""Send ui.log() data to a subprocess (EXPERIMENTAL)

This extension lets you specify a shell command per ui.log() event,
sending all remaining arguments to as environment variables to that command.

Each positional argument to the method results in a `MSG[N]` key in the
environment, starting at 1 (so `MSG1`, `MSG2`, etc.). Each keyword argument
is set as a `OPT_UPPERCASE_KEY` variable (so the key is uppercased, and
prefixed with `OPT_`). The original event name is passed in the `EVENT`
environment variable, and the process ID of mercurial is given in `HGPID`.

So given a call `ui.log('foo', 'bar', 'baz', spam='eggs'), a script configured
for the `foo` event can expect an environment with `MSG1=bar`, `MSG2=baz`, and
`OPT_SPAM=eggs`.

Scripts are configured in the `[logtoprocess]` section, each key an event name.
For example::

  [logtoprocess]
  commandexception = echo "$MSG2$MSG3" > /var/log/mercurial_exceptions.log

would log the warning message and traceback of any failed command dispatch.

Scripts are run asynchronously as detached daemon processes; mercurial will
not ensure that they exit cleanly.

"""

from __future__ import absolute_import

import itertools
import os
import platform
import subprocess
import sys

# Note for extension authors: ONLY specify testedwith = 'ships-with-hg-core' for
# extensions which SHIP WITH MERCURIAL. Non-mainline extensions should
# be specifying the version(s) of Mercurial they are tested with, or
# leave the attribute unspecified.
testedwith = 'ships-with-hg-core'

def uisetup(ui):
    if platform.system() == 'Windows':
        # no fork on Windows, but we can create a detached process
        # https://msdn.microsoft.com/en-us/library/windows/desktop/ms684863.aspx
        # No stdlib constant exists for this value
        DETACHED_PROCESS = 0x00000008
        _creationflags = DETACHED_PROCESS | subprocess.CREATE_NEW_PROCESS_GROUP

        def runshellcommand(script, env):
            # we can't use close_fds *and* redirect stdin. I'm not sure that we
            # need to because the detached process has no console connection.
            subprocess.Popen(
                script, shell=True, env=env, close_fds=True,
                creationflags=_creationflags)
    else:
        def runshellcommand(script, env):
            # double-fork to completely detach from the parent process
            # based on http://code.activestate.com/recipes/278731
            pid = os.fork()
            if pid:
                # parent
                return
            # subprocess.Popen() forks again, all we need to add is
            # flag the new process as a new session.
            if sys.version_info < (3, 2):
                newsession = {'preexec_fn': os.setsid}
            else:
                newsession = {'start_new_session': True}
            try:
                # connect stdin to devnull to make sure the subprocess can't
                # muck up that stream for mercurial.
                subprocess.Popen(
                    script, shell=True, stdin=open(os.devnull, 'r'), env=env,
                    close_fds=True, **newsession)
            finally:
                # mission accomplished, this child needs to exit and not
                # continue the hg process here.
                os._exit(0)

    class logtoprocessui(ui.__class__):
        def log(self, event, *msg, **opts):
            """Map log events to external commands

            Arguments are passed on as environment variables.

            """
            script = self.config('logtoprocess', event)
            if script:
                if msg:
                    # try to format the log message given the remaining
                    # arguments
                    try:
                        # Python string formatting with % either uses a
                        # dictionary *or* tuple, but not both. If we have
                        # keyword options, assume we need a mapping.
                        formatted = msg[0] % (opts or msg[1:])
                    except (TypeError, KeyError):
                        # Failed to apply the arguments, ignore
                        formatted = msg[0]
                    messages = (formatted,) + msg[1:]
                else:
                    messages = msg
                # positional arguments are listed as MSG[N] keys in the
                # environment
                msgpairs = (
                    ('MSG{0:d}'.format(i), str(m))
                    for i, m in enumerate(messages, 1))
                # keyword arguments get prefixed with OPT_ and uppercased
                optpairs = (
                    ('OPT_{0}'.format(key.upper()), str(value))
                    for key, value in opts.iteritems())
                env = dict(itertools.chain(os.environ.items(),
                                           msgpairs, optpairs),
                           EVENT=event, HGPID=str(os.getpid()))
                # Connect stdin to /dev/null to prevent child processes messing
                # with mercurial's stdin.
                runshellcommand(script, env)
            return super(logtoprocessui, self).log(event, *msg, **opts)

    # Replace the class for this instance and all clones created from it:
    ui.__class__ = logtoprocessui