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772 lines
24 KiB
Python
772 lines
24 KiB
Python
# Copyright (c) 2012 The Chromium Authors. All rights reserved.
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# Use of this source code is governed by a BSD-style license that can be
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# found in the LICENSE file.
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"""Generic utils."""
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import codecs
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import errno
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import logging
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import os
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import Queue
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import re
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import stat
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import sys
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import tempfile
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import threading
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import time
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import urlparse
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import subprocess2
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class Error(Exception):
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"""gclient exception class."""
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pass
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def SplitUrlRevision(url):
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"""Splits url and returns a two-tuple: url, rev"""
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if url.startswith('ssh:'):
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# Make sure ssh://user-name@example.com/~/test.git@stable works
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regex = r'(ssh://(?:[-\w]+@)?[-\w:\.]+/[-~\w\./]+)(?:@(.+))?'
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components = re.search(regex, url).groups()
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else:
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components = url.split('@', 1)
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if len(components) == 1:
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components += [None]
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return tuple(components)
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def IsDateRevision(revision):
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"""Returns true if the given revision is of the form "{ ... }"."""
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return bool(revision and re.match(r'^\{.+\}$', str(revision)))
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def MakeDateRevision(date):
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"""Returns a revision representing the latest revision before the given
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date."""
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return "{" + date + "}"
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def SyntaxErrorToError(filename, e):
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"""Raises a gclient_utils.Error exception with the human readable message"""
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try:
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# Try to construct a human readable error message
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if filename:
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error_message = 'There is a syntax error in %s\n' % filename
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else:
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error_message = 'There is a syntax error\n'
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error_message += 'Line #%s, character %s: "%s"' % (
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e.lineno, e.offset, re.sub(r'[\r\n]*$', '', e.text))
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except:
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# Something went wrong, re-raise the original exception
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raise e
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else:
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raise Error(error_message)
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class PrintableObject(object):
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def __str__(self):
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output = ''
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for i in dir(self):
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if i.startswith('__'):
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continue
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output += '%s = %s\n' % (i, str(getattr(self, i, '')))
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return output
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def FileRead(filename, mode='rU'):
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with open(filename, mode=mode) as f:
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# codecs.open() has different behavior than open() on python 2.6 so use
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# open() and decode manually.
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s = f.read()
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try:
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return s.decode('utf-8')
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except UnicodeDecodeError:
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return s
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def FileWrite(filename, content, mode='w'):
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with codecs.open(filename, mode=mode, encoding='utf-8') as f:
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f.write(content)
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def rmtree(path):
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"""shutil.rmtree() on steroids.
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Recursively removes a directory, even if it's marked read-only.
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shutil.rmtree() doesn't work on Windows if any of the files or directories
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are read-only, which svn repositories and some .svn files are. We need to
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be able to force the files to be writable (i.e., deletable) as we traverse
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the tree.
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Even with all this, Windows still sometimes fails to delete a file, citing
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a permission error (maybe something to do with antivirus scans or disk
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indexing). The best suggestion any of the user forums had was to wait a
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bit and try again, so we do that too. It's hand-waving, but sometimes it
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works. :/
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On POSIX systems, things are a little bit simpler. The modes of the files
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to be deleted doesn't matter, only the modes of the directories containing
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them are significant. As the directory tree is traversed, each directory
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has its mode set appropriately before descending into it. This should
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result in the entire tree being removed, with the possible exception of
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*path itself, because nothing attempts to change the mode of its parent.
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Doing so would be hazardous, as it's not a directory slated for removal.
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In the ordinary case, this is not a problem: for our purposes, the user
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will never lack write permission on *path's parent.
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"""
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if not os.path.exists(path):
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return
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if os.path.islink(path) or not os.path.isdir(path):
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raise Error('Called rmtree(%s) in non-directory' % path)
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if sys.platform == 'win32':
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# Some people don't have the APIs installed. In that case we'll do without.
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win32api = None
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win32con = None
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try:
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# Unable to import 'XX'
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# pylint: disable=F0401
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import win32api, win32con
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except ImportError:
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pass
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else:
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# On POSIX systems, we need the x-bit set on the directory to access it,
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# the r-bit to see its contents, and the w-bit to remove files from it.
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# The actual modes of the files within the directory is irrelevant.
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os.chmod(path, stat.S_IRUSR | stat.S_IWUSR | stat.S_IXUSR)
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def remove(func, subpath):
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if sys.platform == 'win32':
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os.chmod(subpath, stat.S_IWRITE)
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if win32api and win32con:
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win32api.SetFileAttributes(subpath, win32con.FILE_ATTRIBUTE_NORMAL)
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try:
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func(subpath)
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except OSError, e:
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if e.errno != errno.EACCES or sys.platform != 'win32':
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raise
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# Failed to delete, try again after a 100ms sleep.
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time.sleep(0.1)
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func(subpath)
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for fn in os.listdir(path):
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# If fullpath is a symbolic link that points to a directory, isdir will
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# be True, but we don't want to descend into that as a directory, we just
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# want to remove the link. Check islink and treat links as ordinary files
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# would be treated regardless of what they reference.
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fullpath = os.path.join(path, fn)
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if os.path.islink(fullpath) or not os.path.isdir(fullpath):
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remove(os.remove, fullpath)
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else:
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# Recurse.
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rmtree(fullpath)
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remove(os.rmdir, path)
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# TODO(maruel): Rename the references.
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RemoveDirectory = rmtree
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def safe_makedirs(tree):
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"""Creates the directory in a safe manner.
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Because multiple threads can create these directories concurently, trap the
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exception and pass on.
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"""
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count = 0
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while not os.path.exists(tree):
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count += 1
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try:
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os.makedirs(tree)
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except OSError, e:
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# 17 POSIX, 183 Windows
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if e.errno not in (17, 183):
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raise
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if count > 40:
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# Give up.
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raise
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def CheckCallAndFilterAndHeader(args, always=False, **kwargs):
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"""Adds 'header' support to CheckCallAndFilter.
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If |always| is True, a message indicating what is being done
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is printed to stdout all the time even if not output is generated. Otherwise
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the message header is printed only if the call generated any ouput.
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"""
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stdout = kwargs.get('stdout', None) or sys.stdout
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if always:
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stdout.write('\n________ running \'%s\' in \'%s\'\n'
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% (' '.join(args), kwargs.get('cwd', '.')))
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else:
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filter_fn = kwargs.get('filter_fn', None)
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def filter_msg(line):
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if line is None:
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stdout.write('\n________ running \'%s\' in \'%s\'\n'
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% (' '.join(args), kwargs.get('cwd', '.')))
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elif filter_fn:
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filter_fn(line)
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kwargs['filter_fn'] = filter_msg
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kwargs['call_filter_on_first_line'] = True
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# Obviously.
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kwargs['print_stdout'] = True
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return CheckCallAndFilter(args, **kwargs)
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class Wrapper(object):
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"""Wraps an object, acting as a transparent proxy for all properties by
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default.
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"""
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def __init__(self, wrapped):
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self._wrapped = wrapped
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def __getattr__(self, name):
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return getattr(self._wrapped, name)
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class AutoFlush(Wrapper):
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"""Creates a file object clone to automatically flush after N seconds."""
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def __init__(self, wrapped, delay):
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super(AutoFlush, self).__init__(wrapped)
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if not hasattr(self, 'lock'):
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self.lock = threading.Lock()
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self.__last_flushed_at = time.time()
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self.delay = delay
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@property
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def autoflush(self):
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return self
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def write(self, out, *args, **kwargs):
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self._wrapped.write(out, *args, **kwargs)
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should_flush = False
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self.lock.acquire()
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try:
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if self.delay and (time.time() - self.__last_flushed_at) > self.delay:
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should_flush = True
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self.__last_flushed_at = time.time()
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finally:
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self.lock.release()
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if should_flush:
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self.flush()
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class Annotated(Wrapper):
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"""Creates a file object clone to automatically prepends every line in worker
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threads with a NN> prefix.
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"""
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def __init__(self, wrapped, include_zero=False):
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super(Annotated, self).__init__(wrapped)
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if not hasattr(self, 'lock'):
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self.lock = threading.Lock()
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self.__output_buffers = {}
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self.__include_zero = include_zero
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@property
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def annotated(self):
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return self
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def write(self, out):
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index = getattr(threading.currentThread(), 'index', 0)
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if not index and not self.__include_zero:
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# Unindexed threads aren't buffered.
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return self._wrapped.write(out)
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self.lock.acquire()
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try:
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# Use a dummy array to hold the string so the code can be lockless.
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# Strings are immutable, requiring to keep a lock for the whole dictionary
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# otherwise. Using an array is faster than using a dummy object.
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if not index in self.__output_buffers:
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obj = self.__output_buffers[index] = ['']
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else:
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obj = self.__output_buffers[index]
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finally:
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self.lock.release()
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# Continue lockless.
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obj[0] += out
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while '\n' in obj[0]:
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line, remaining = obj[0].split('\n', 1)
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if line:
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self._wrapped.write('%d>%s\n' % (index, line))
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obj[0] = remaining
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def flush(self):
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"""Flush buffered output."""
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orphans = []
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self.lock.acquire()
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try:
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# Detect threads no longer existing.
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indexes = (getattr(t, 'index', None) for t in threading.enumerate())
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indexes = filter(None, indexes)
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for index in self.__output_buffers:
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if not index in indexes:
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orphans.append((index, self.__output_buffers[index][0]))
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for orphan in orphans:
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del self.__output_buffers[orphan[0]]
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finally:
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self.lock.release()
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# Don't keep the lock while writting. Will append \n when it shouldn't.
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for orphan in orphans:
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if orphan[1]:
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self._wrapped.write('%d>%s\n' % (orphan[0], orphan[1]))
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return self._wrapped.flush()
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def MakeFileAutoFlush(fileobj, delay=10):
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autoflush = getattr(fileobj, 'autoflush', None)
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if autoflush:
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autoflush.delay = delay
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return fileobj
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return AutoFlush(fileobj, delay)
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def MakeFileAnnotated(fileobj, include_zero=False):
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if getattr(fileobj, 'annotated', None):
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return fileobj
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return Annotated(fileobj)
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def CheckCallAndFilter(args, stdout=None, filter_fn=None,
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print_stdout=None, call_filter_on_first_line=False,
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**kwargs):
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"""Runs a command and calls back a filter function if needed.
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Accepts all subprocess2.Popen() parameters plus:
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print_stdout: If True, the command's stdout is forwarded to stdout.
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filter_fn: A function taking a single string argument called with each line
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of the subprocess2's output. Each line has the trailing newline
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character trimmed.
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stdout: Can be any bufferable output.
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stderr is always redirected to stdout.
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"""
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assert print_stdout or filter_fn
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stdout = stdout or sys.stdout
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filter_fn = filter_fn or (lambda x: None)
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kid = subprocess2.Popen(
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args, bufsize=0, stdout=subprocess2.PIPE, stderr=subprocess2.STDOUT,
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**kwargs)
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# Do a flush of stdout before we begin reading from the subprocess2's stdout
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stdout.flush()
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# Also, we need to forward stdout to prevent weird re-ordering of output.
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# This has to be done on a per byte basis to make sure it is not buffered:
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# normally buffering is done for each line, but if svn requests input, no
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# end-of-line character is output after the prompt and it would not show up.
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try:
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in_byte = kid.stdout.read(1)
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if in_byte:
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if call_filter_on_first_line:
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filter_fn(None)
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in_line = ''
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while in_byte:
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if in_byte != '\r':
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if print_stdout:
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stdout.write(in_byte)
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if in_byte != '\n':
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in_line += in_byte
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else:
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filter_fn(in_line)
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in_line = ''
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else:
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filter_fn(in_line)
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in_line = ''
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in_byte = kid.stdout.read(1)
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# Flush the rest of buffered output. This is only an issue with
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# stdout/stderr not ending with a \n.
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if len(in_line):
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filter_fn(in_line)
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rv = kid.wait()
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except KeyboardInterrupt:
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print >> sys.stderr, 'Failed while running "%s"' % ' '.join(args)
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raise
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if rv:
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raise subprocess2.CalledProcessError(
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rv, args, kwargs.get('cwd', None), None, None)
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return 0
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def FindGclientRoot(from_dir, filename='.gclient'):
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"""Tries to find the gclient root."""
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real_from_dir = os.path.realpath(from_dir)
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path = real_from_dir
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while not os.path.exists(os.path.join(path, filename)):
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split_path = os.path.split(path)
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if not split_path[1]:
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return None
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path = split_path[0]
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# If we did not find the file in the current directory, make sure we are in a
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# sub directory that is controlled by this configuration.
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if path != real_from_dir:
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entries_filename = os.path.join(path, filename + '_entries')
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if not os.path.exists(entries_filename):
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# If .gclient_entries does not exist, a previous call to gclient sync
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# might have failed. In that case, we cannot verify that the .gclient
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# is the one we want to use. In order to not to cause too much trouble,
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# just issue a warning and return the path anyway.
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print >> sys.stderr, ("%s file in parent directory %s might not be the "
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"file you want to use" % (filename, path))
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return path
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scope = {}
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try:
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exec(FileRead(entries_filename), scope)
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except SyntaxError, e:
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SyntaxErrorToError(filename, e)
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all_directories = scope['entries'].keys()
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path_to_check = real_from_dir[len(path)+1:]
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while path_to_check:
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if path_to_check in all_directories:
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return path
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path_to_check = os.path.dirname(path_to_check)
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return None
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logging.info('Found gclient root at ' + path)
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return path
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def PathDifference(root, subpath):
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"""Returns the difference subpath minus root."""
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root = os.path.realpath(root)
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subpath = os.path.realpath(subpath)
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if not subpath.startswith(root):
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return None
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# If the root does not have a trailing \ or /, we add it so the returned
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# path starts immediately after the seperator regardless of whether it is
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# provided.
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root = os.path.join(root, '')
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return subpath[len(root):]
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def FindFileUpwards(filename, path=None):
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"""Search upwards from the a directory (default: current) to find a file.
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Returns nearest upper-level directory with the passed in file.
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"""
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if not path:
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path = os.getcwd()
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path = os.path.realpath(path)
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while True:
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file_path = os.path.join(path, filename)
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if os.path.exists(file_path):
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return path
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(new_path, _) = os.path.split(path)
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if new_path == path:
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return None
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path = new_path
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def GetGClientRootAndEntries(path=None):
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"""Returns the gclient root and the dict of entries."""
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config_file = '.gclient_entries'
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root = FindFileUpwards(config_file, path)
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if not root:
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print "Can't find %s" % config_file
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return None
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config_path = os.path.join(root, config_file)
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env = {}
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execfile(config_path, env)
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config_dir = os.path.dirname(config_path)
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return config_dir, env['entries']
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def lockedmethod(method):
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"""Method decorator that holds self.lock for the duration of the call."""
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def inner(self, *args, **kwargs):
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try:
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try:
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self.lock.acquire()
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except KeyboardInterrupt:
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print >> sys.stderr, 'Was deadlocked'
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raise
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return method(self, *args, **kwargs)
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finally:
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self.lock.release()
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return inner
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class WorkItem(object):
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"""One work item."""
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# On cygwin, creating a lock throwing randomly when nearing ~100 locks.
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# As a workaround, use a single lock. Yep you read it right. Single lock for
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# all the 100 objects.
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lock = threading.Lock()
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def __init__(self, name):
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# A unique string representing this work item.
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self._name = name
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def run(self, work_queue):
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"""work_queue is passed as keyword argument so it should be
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the last parameters of the function when you override it."""
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pass
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@property
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def name(self):
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return self._name
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|
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class ExecutionQueue(object):
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"""Runs a set of WorkItem that have interdependencies and were WorkItem are
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added as they are processed.
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In gclient's case, Dependencies sometime needs to be run out of order due to
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From() keyword. This class manages that all the required dependencies are run
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before running each one.
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Methods of this class are thread safe.
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"""
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def __init__(self, jobs, progress):
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"""jobs specifies the number of concurrent tasks to allow. progress is a
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Progress instance."""
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# Set when a thread is done or a new item is enqueued.
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self.ready_cond = threading.Condition()
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# Maximum number of concurrent tasks.
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self.jobs = jobs
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# List of WorkItem, for gclient, these are Dependency instances.
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self.queued = []
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# List of strings representing each Dependency.name that was run.
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self.ran = []
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# List of items currently running.
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self.running = []
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# Exceptions thrown if any.
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self.exceptions = Queue.Queue()
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# Progress status
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self.progress = progress
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if self.progress:
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self.progress.update(0)
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def enqueue(self, d):
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"""Enqueue one Dependency to be executed later once its requirements are
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satisfied.
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"""
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assert isinstance(d, WorkItem)
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self.ready_cond.acquire()
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try:
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self.queued.append(d)
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total = len(self.queued) + len(self.ran) + len(self.running)
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logging.debug('enqueued(%s)' % d.name)
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if self.progress:
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self.progress._total = total + 1
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self.progress.update(0)
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self.ready_cond.notifyAll()
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finally:
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self.ready_cond.release()
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def flush(self, *args, **kwargs):
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"""Runs all enqueued items until all are executed."""
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kwargs['work_queue'] = self
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self.ready_cond.acquire()
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try:
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while True:
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# Check for task to run first, then wait.
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while True:
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if not self.exceptions.empty():
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# Systematically flush the queue when an exception logged.
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self.queued = []
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self._flush_terminated_threads()
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if (not self.queued and not self.running or
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self.jobs == len(self.running)):
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logging.debug('No more worker threads or can\'t queue anything.')
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break
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# Check for new tasks to start.
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for i in xrange(len(self.queued)):
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# Verify its requirements.
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for r in self.queued[i].requirements:
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if not r in self.ran:
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# Requirement not met.
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break
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else:
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# Start one work item: all its requirements are satisfied.
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self._run_one_task(self.queued.pop(i), args, kwargs)
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break
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else:
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# Couldn't find an item that could run. Break out the outher loop.
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break
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if not self.queued and not self.running:
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# We're done.
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break
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# We need to poll here otherwise Ctrl-C isn't processed.
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try:
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self.ready_cond.wait(10)
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except KeyboardInterrupt:
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# Help debugging by printing some information:
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print >> sys.stderr, (
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('\nAllowed parallel jobs: %d\n# queued: %d\nRan: %s\n'
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'Running: %d') % (
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self.jobs,
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len(self.queued),
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', '.join(self.ran),
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len(self.running)))
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for i in self.queued:
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print >> sys.stderr, '%s: %s' % (i.name, ', '.join(i.requirements))
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raise
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# Something happened: self.enqueue() or a thread terminated. Loop again.
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finally:
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self.ready_cond.release()
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assert not self.running, 'Now guaranteed to be single-threaded'
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if not self.exceptions.empty():
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# To get back the stack location correctly, the raise a, b, c form must be
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# used, passing a tuple as the first argument doesn't work.
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e = self.exceptions.get()
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raise e[0], e[1], e[2]
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if self.progress:
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self.progress.end()
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def _flush_terminated_threads(self):
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"""Flush threads that have terminated."""
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running = self.running
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self.running = []
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for t in running:
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if t.isAlive():
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self.running.append(t)
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else:
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t.join()
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sys.stdout.flush()
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if self.progress:
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self.progress.update(1, t.item.name)
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if t.item.name in self.ran:
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raise Error(
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'gclient is confused, "%s" is already in "%s"' % (
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t.item.name, ', '.join(self.ran)))
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if not t.item.name in self.ran:
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self.ran.append(t.item.name)
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def _run_one_task(self, task_item, args, kwargs):
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if self.jobs > 1:
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# Start the thread.
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index = len(self.ran) + len(self.running) + 1
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new_thread = self._Worker(task_item, index, args, kwargs)
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self.running.append(new_thread)
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new_thread.start()
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else:
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# Run the 'thread' inside the main thread. Don't try to catch any
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# exception.
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task_item.run(*args, **kwargs)
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self.ran.append(task_item.name)
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if self.progress:
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self.progress.update(1, ', '.join(t.item.name for t in self.running))
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class _Worker(threading.Thread):
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"""One thread to execute one WorkItem."""
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def __init__(self, item, index, args, kwargs):
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threading.Thread.__init__(self, name=item.name or 'Worker')
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logging.info('_Worker(%s) reqs:%s' % (item.name, item.requirements))
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self.item = item
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self.index = index
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self.args = args
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self.kwargs = kwargs
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def run(self):
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"""Runs in its own thread."""
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logging.debug('_Worker.run(%s)' % self.item.name)
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work_queue = self.kwargs['work_queue']
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try:
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self.item.run(*self.args, **self.kwargs)
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except Exception:
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# Catch exception location.
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logging.info('Caught exception in thread %s' % self.item.name)
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logging.info(str(sys.exc_info()))
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work_queue.exceptions.put(sys.exc_info())
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logging.info('_Worker.run(%s) done' % self.item.name)
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work_queue.ready_cond.acquire()
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try:
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work_queue.ready_cond.notifyAll()
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finally:
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work_queue.ready_cond.release()
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def GetEditor(git):
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"""Returns the most plausible editor to use."""
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if git:
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editor = os.environ.get('GIT_EDITOR')
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else:
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editor = os.environ.get('SVN_EDITOR')
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if not editor:
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editor = os.environ.get('EDITOR')
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if not editor:
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if sys.platform.startswith('win'):
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editor = 'notepad'
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else:
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editor = 'vim'
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return editor
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def RunEditor(content, git):
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"""Opens up the default editor in the system to get the CL description."""
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file_handle, filename = tempfile.mkstemp(text=True)
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# Make sure CRLF is handled properly by requiring none.
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if '\r' in content:
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print >> sys.stderr, (
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'!! Please remove \\r from your change description !!')
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fileobj = os.fdopen(file_handle, 'w')
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# Still remove \r if present.
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fileobj.write(re.sub('\r?\n', '\n', content))
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fileobj.close()
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try:
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cmd = '%s %s' % (GetEditor(git), filename)
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if sys.platform == 'win32' and os.environ.get('TERM') == 'msys':
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# Msysgit requires the usage of 'env' to be present.
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cmd = 'env ' + cmd
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try:
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# shell=True to allow the shell to handle all forms of quotes in
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# $EDITOR.
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subprocess2.check_call(cmd, shell=True)
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except subprocess2.CalledProcessError:
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return None
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return FileRead(filename)
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finally:
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os.remove(filename)
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def UpgradeToHttps(url):
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"""Upgrades random urls to https://.
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Do not touch unknown urls like ssh:// or git://.
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Do not touch http:// urls with a port number,
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Fixes invalid GAE url.
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"""
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if not url:
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return url
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if not re.match(r'[a-z\-]+\://.*', url):
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# Make sure it is a valid uri. Otherwise, urlparse() will consider it a
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# relative url and will use http:///foo. Note that it defaults to http://
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# for compatibility with naked url like "localhost:8080".
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url = 'http://%s' % url
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parsed = list(urlparse.urlparse(url))
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# Do not automatically upgrade http to https if a port number is provided.
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if parsed[0] == 'http' and not re.match(r'^.+?\:\d+$', parsed[1]):
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parsed[0] = 'https'
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return urlparse.urlunparse(parsed)
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def ParseCodereviewSettingsContent(content):
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"""Process a codereview.settings file properly."""
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lines = (l for l in content.splitlines() if not l.strip().startswith("#"))
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try:
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keyvals = dict([x.strip() for x in l.split(':', 1)] for l in lines if l)
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except ValueError:
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raise Error(
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'Failed to process settings, please fix. Content:\n\n%s' % content)
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def fix_url(key):
|
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if keyvals.get(key):
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keyvals[key] = UpgradeToHttps(keyvals[key])
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fix_url('CODE_REVIEW_SERVER')
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fix_url('VIEW_VC')
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return keyvals
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