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# Bazaar-NG -- distributed version control
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# Copyright (C) 2005 by Canonical Ltd
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# Copyright (C) 2005, 2006, 2007 Canonical Ltd
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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import os, types, re, time, errno
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from stat import S_ISREG, S_ISDIR, S_ISLNK, ST_MODE, ST_SIZE
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from errors import bailout, BzrError
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from trace import mutter
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from cStringIO import StringIO
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from stat import (S_ISREG, S_ISDIR, S_ISLNK, ST_MODE, ST_SIZE,
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S_ISCHR, S_ISBLK, S_ISFIFO, S_ISSOCK)
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from bzrlib.lazy_import import lazy_import
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lazy_import(globals(), """
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from datetime import datetime
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from ntpath import (abspath as _nt_abspath,
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normpath as _nt_normpath,
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realpath as _nt_realpath,
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splitdrive as _nt_splitdrive,
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from tempfile import (
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from bzrlib import symbol_versioning
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from bzrlib.symbol_versioning import (
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from bzrlib.trace import mutter
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# On win32, O_BINARY is used to indicate the file should
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# be opened in binary mode, rather than text mode.
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# On other platforms, O_BINARY doesn't exist, because
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# they always open in binary mode, so it is okay to
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# OR with 0 on those platforms
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O_BINARY = getattr(os, 'O_BINARY', 0)
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def make_readonly(filename):
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"""Make a filename read-only."""
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# TODO: probably needs to be fixed for windows
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mod = os.stat(filename).st_mode
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os.chmod(filename, mod)
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mod = os.lstat(filename).st_mode
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if not stat.S_ISLNK(mod):
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os.chmod(filename, mod)
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def make_writable(filename):
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mod = os.stat(filename).st_mode
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os.chmod(filename, mod)
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_QUOTE_RE = re.compile(r'([^a-zA-Z0-9.,:/_~-])')
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mod = os.lstat(filename).st_mode
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if not stat.S_ISLNK(mod):
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os.chmod(filename, mod)
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def minimum_path_selection(paths):
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"""Return the smallset subset of paths which are outside paths.
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:param paths: A container (and hence not None) of paths.
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:return: A set of paths sufficient to include everything in paths via
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is_inside_any, drawn from the paths parameter.
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other_paths = paths.difference([path])
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if not is_inside_any(other_paths, path):
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# this is a top level path, we must check it.
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search_paths.add(path)
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"""Return shell-quoted filename"""
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## We could be a bit more terse by using double-quotes etc
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f = _QUOTE_RE.sub(r'\\\1', f)
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mode = os.lstat(f)[ST_MODE]
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raise BzrError("can't handle file kind with mode %o of %r" % (mode, f))
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"""Return a quoted filename filename
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This previously used backslash quoting, but that works poorly on
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# TODO: I'm not really sure this is the best format either.x
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if _QUOTE_RE is None:
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_QUOTE_RE = re.compile(r'([^a-zA-Z0-9.,:/\\_~-])')
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if _QUOTE_RE.search(f):
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_directory_kind = 'directory'
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stat.S_IFDIR:_directory_kind,
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stat.S_IFCHR:'chardev',
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stat.S_IFBLK:'block',
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stat.S_IFLNK:'symlink',
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stat.S_IFSOCK:'socket',
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def file_kind_from_stat_mode(stat_mode, _formats=_formats, _unknown='unknown'):
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"""Generate a file kind from a stat mode. This is used in walkdirs.
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Its performance is critical: Do not mutate without careful benchmarking.
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return _formats[stat_mode & 0170000]
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def file_kind(f, _lstat=os.lstat, _mapper=file_kind_from_stat_mode):
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return _mapper(_lstat(f).st_mode)
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if getattr(e, 'errno', None) in (errno.ENOENT, errno.ENOTDIR):
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raise errors.NoSuchFile(f)
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"""Return the current umask"""
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# Assume that people aren't messing with the umask while running
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# XXX: This is not thread safe, but there is no way to get the
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# umask without setting it
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_directory_kind: "/",
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'tree-reference': '+',
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def kind_marker(kind):
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return _kind_marker_map[kind]
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raise errors.BzrError('invalid file kind %r' % kind)
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lexists = getattr(os.path, 'lexists', None)
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stat = getattr(os, 'lstat', os.stat)
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if e.errno == errno.ENOENT:
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raise errors.BzrError("lstat/stat of (%r): %r" % (f, e))
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def fancy_rename(old, new, rename_func, unlink_func):
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"""A fancy rename, when you don't have atomic rename.
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:param old: The old path, to rename from
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:param new: The new path, to rename to
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:param rename_func: The potentially non-atomic rename function
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:param unlink_func: A way to delete the target file if the full rename succeeds
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# sftp rename doesn't allow overwriting, so play tricks:
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base = os.path.basename(new)
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dirname = os.path.dirname(new)
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tmp_name = u'tmp.%s.%.9f.%d.%s' % (base, time.time(), os.getpid(), rand_chars(10))
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tmp_name = pathjoin(dirname, tmp_name)
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# Rename the file out of the way, but keep track if it didn't exist
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# We don't want to grab just any exception
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# something like EACCES should prevent us from continuing
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# The downside is that the rename_func has to throw an exception
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# with an errno = ENOENT, or NoSuchFile
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rename_func(new, tmp_name)
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except (errors.NoSuchFile,), e:
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# RBC 20060103 abstraction leakage: the paramiko SFTP clients rename
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# function raises an IOError with errno is None when a rename fails.
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# This then gets caught here.
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if e.errno not in (None, errno.ENOENT, errno.ENOTDIR):
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if (getattr(e, 'errno', None) is None
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or e.errno not in (errno.ENOENT, errno.ENOTDIR)):
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# This may throw an exception, in which case success will
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rename_func(old, new)
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except (IOError, OSError), e:
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# source and target may be aliases of each other (e.g. on a
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# case-insensitive filesystem), so we may have accidentally renamed
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# source by when we tried to rename target
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if not (file_existed and e.errno in (None, errno.ENOENT)):
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# If the file used to exist, rename it back into place
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# otherwise just delete it from the tmp location
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unlink_func(tmp_name)
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rename_func(tmp_name, new)
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# In Python 2.4.2 and older, os.path.abspath and os.path.realpath
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# choke on a Unicode string containing a relative path if
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# os.getcwd() returns a non-sys.getdefaultencoding()-encoded
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_fs_enc = sys.getfilesystemencoding() or 'utf-8'
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def _posix_abspath(path):
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# jam 20060426 rather than encoding to fsencoding
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# copy posixpath.abspath, but use os.getcwdu instead
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if not posixpath.isabs(path):
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path = posixpath.join(getcwd(), path)
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return posixpath.normpath(path)
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def _posix_realpath(path):
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return posixpath.realpath(path.encode(_fs_enc)).decode(_fs_enc)
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def _win32_fixdrive(path):
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"""Force drive letters to be consistent.
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win32 is inconsistent whether it returns lower or upper case
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and even if it was consistent the user might type the other
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so we force it to uppercase
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running python.exe under cmd.exe return capital C:\\
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running win32 python inside a cygwin shell returns lowercase c:\\
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drive, path = _nt_splitdrive(path)
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return drive.upper() + path
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def _win32_abspath(path):
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# Real _nt_abspath doesn't have a problem with a unicode cwd
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return _win32_fixdrive(_nt_abspath(unicode(path)).replace('\\', '/'))
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def _win98_abspath(path):
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"""Return the absolute version of a path.
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Windows 98 safe implementation (python reimplementation
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of Win32 API function GetFullPathNameW)
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# \\HOST\path => //HOST/path
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# //HOST/path => //HOST/path
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# path => C:/cwd/path
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# check for absolute path
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drive = _nt_splitdrive(path)[0]
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if drive == '' and path[:2] not in('//','\\\\'):
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# we cannot simply os.path.join cwd and path
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# because os.path.join('C:','/path') produce '/path'
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# and this is incorrect
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if path[:1] in ('/','\\'):
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cwd = _nt_splitdrive(cwd)[0]
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path = cwd + '\\' + path
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return _win32_fixdrive(_nt_normpath(path).replace('\\', '/'))
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if win32utils.winver == 'Windows 98':
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_win32_abspath = _win98_abspath
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def _win32_realpath(path):
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# Real _nt_realpath doesn't have a problem with a unicode cwd
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return _win32_fixdrive(_nt_realpath(unicode(path)).replace('\\', '/'))
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def _win32_pathjoin(*args):
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return _nt_join(*args).replace('\\', '/')
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def _win32_normpath(path):
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return _win32_fixdrive(_nt_normpath(unicode(path)).replace('\\', '/'))
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return _win32_fixdrive(os.getcwdu().replace('\\', '/'))
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def _win32_mkdtemp(*args, **kwargs):
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return _win32_fixdrive(tempfile.mkdtemp(*args, **kwargs).replace('\\', '/'))
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def _win32_rename(old, new):
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"""We expect to be able to atomically replace 'new' with old.
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On win32, if new exists, it must be moved out of the way first,
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fancy_rename(old, new, rename_func=os.rename, unlink_func=os.unlink)
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if e.errno in (errno.EPERM, errno.EACCES, errno.EBUSY, errno.EINVAL):
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# If we try to rename a non-existant file onto cwd, we get
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# EPERM or EACCES instead of ENOENT, this will raise ENOENT
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# if the old path doesn't exist, sometimes we get EACCES
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# On Linux, we seem to get EBUSY, on Mac we get EINVAL
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return unicodedata.normalize('NFC', os.getcwdu())
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# Default is to just use the python builtins, but these can be rebound on
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# particular platforms.
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abspath = _posix_abspath
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realpath = _posix_realpath
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pathjoin = os.path.join
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normpath = os.path.normpath
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dirname = os.path.dirname
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basename = os.path.basename
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split = os.path.split
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splitext = os.path.splitext
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# These were already imported into local scope
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# mkdtemp = tempfile.mkdtemp
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# rmtree = shutil.rmtree
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MIN_ABS_PATHLENGTH = 1
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if sys.platform == 'win32':
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abspath = _win32_abspath
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realpath = _win32_realpath
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pathjoin = _win32_pathjoin
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normpath = _win32_normpath
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getcwd = _win32_getcwd
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mkdtemp = _win32_mkdtemp
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rename = _win32_rename
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MIN_ABS_PATHLENGTH = 3
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def _win32_delete_readonly(function, path, excinfo):
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"""Error handler for shutil.rmtree function [for win32]
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Helps to remove files and dirs marked as read-only.
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exception = excinfo[1]
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if function in (os.remove, os.rmdir) \
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and isinstance(exception, OSError) \
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and exception.errno == errno.EACCES:
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def rmtree(path, ignore_errors=False, onerror=_win32_delete_readonly):
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"""Replacer for shutil.rmtree: could remove readonly dirs/files"""
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return shutil.rmtree(path, ignore_errors, onerror)
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elif sys.platform == 'darwin':
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def get_terminal_encoding():
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"""Find the best encoding for printing to the screen.
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This attempts to check both sys.stdout and sys.stdin to see
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what encoding they are in, and if that fails it falls back to
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bzrlib.user_encoding.
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The problem is that on Windows, locale.getpreferredencoding()
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is not the same encoding as that used by the console:
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http://mail.python.org/pipermail/python-list/2003-May/162357.html
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On my standard US Windows XP, the preferred encoding is
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cp1252, but the console is cp437
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output_encoding = getattr(sys.stdout, 'encoding', None)
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if not output_encoding:
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input_encoding = getattr(sys.stdin, 'encoding', None)
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if not input_encoding:
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output_encoding = bzrlib.user_encoding
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mutter('encoding stdout as bzrlib.user_encoding %r', output_encoding)
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output_encoding = input_encoding
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mutter('encoding stdout as sys.stdin encoding %r', output_encoding)
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mutter('encoding stdout as sys.stdout encoding %r', output_encoding)
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if output_encoding == 'cp0':
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# invalid encoding (cp0 means 'no codepage' on Windows)
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output_encoding = bzrlib.user_encoding
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mutter('cp0 is invalid encoding.'
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' encoding stdout as bzrlib.user_encoding %r', output_encoding)
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codecs.lookup(output_encoding)
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sys.stderr.write('bzr: warning:'
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' unknown terminal encoding %s.\n'
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' Using encoding %s instead.\n'
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% (output_encoding, bzrlib.user_encoding)
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output_encoding = bzrlib.user_encoding
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return output_encoding
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def normalizepath(f):
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if getattr(os.path, 'realpath', None) is not None:
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[p,e] = os.path.split(f)
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if e == "" or e == "." or e == "..":
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return pathjoin(F(p), e)
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def local_time_offset(t=None):
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"""Return offset of local zone from GMT, either at present or at time t."""
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# python2.3 localtime() can't take None
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if time.localtime(t).tm_isdst and time.daylight:
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return -time.timezone
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def format_date(t, offset=0, timezone='original'):
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## TODO: Perhaps a global option to use either universal or local time?
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## Or perhaps just let people set $TZ?
256
assert isinstance(t, float)
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offset = datetime.fromtimestamp(t) - datetime.utcfromtimestamp(t)
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return offset.days * 86400 + offset.seconds
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def format_date(t, offset=0, timezone='original', date_fmt=None,
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"""Return a formatted date string.
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:param t: Seconds since the epoch.
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:param offset: Timezone offset in seconds east of utc.
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:param timezone: How to display the time: 'utc', 'original' for the
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timezone specified by offset, or 'local' for the process's current
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:param show_offset: Whether to append the timezone.
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:param date_fmt: strftime format.
258
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if timezone == 'utc':
259
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tt = time.gmtime(t)
261
660
elif timezone == 'original':
264
663
tt = time.gmtime(t + offset)
265
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elif timezone == 'local':
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tt = time.localtime(t)
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offset = local_time_offset(t)
269
bailout("unsupported timezone format %r",
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['options are "utc", "original", "local"'])
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return (time.strftime("%a %Y-%m-%d %H:%M:%S", tt)
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+ ' %+03d%02d' % (offset / 3600, (offset / 60) % 60))
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raise errors.UnsupportedTimezoneFormat(timezone)
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date_fmt = "%a %Y-%m-%d %H:%M:%S"
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offset_str = ' %+03d%02d' % (offset / 3600, (offset / 60) % 60)
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return (time.strftime(date_fmt, tt) + offset_str)
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def compact_date(when):
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679
return time.strftime('%Y%m%d%H%M%S', time.gmtime(when))
682
def format_delta(delta):
683
"""Get a nice looking string for a time delta.
685
:param delta: The time difference in seconds, can be positive or negative.
686
positive indicates time in the past, negative indicates time in the
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future. (usually time.time() - stored_time)
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:return: String formatted to show approximate resolution
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direction = 'in the future'
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if seconds < 90: # print seconds up to 90 seconds
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return '%d second %s' % (seconds, direction,)
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return '%d seconds %s' % (seconds, direction)
704
minutes = int(seconds / 60)
705
seconds -= 60 * minutes
710
if minutes < 90: # print minutes, seconds up to 90 minutes
712
return '%d minute, %d second%s %s' % (
713
minutes, seconds, plural_seconds, direction)
715
return '%d minutes, %d second%s %s' % (
716
minutes, seconds, plural_seconds, direction)
718
hours = int(minutes / 60)
719
minutes -= 60 * hours
726
return '%d hour, %d minute%s %s' % (hours, minutes,
727
plural_minutes, direction)
728
return '%d hours, %d minute%s %s' % (hours, minutes,
729
plural_minutes, direction)
282
732
"""Return size of given open file."""
283
733
return os.fstat(f.fileno())[ST_SIZE]
286
if hasattr(os, 'urandom'): # python 2.4 and later
736
# Define rand_bytes based on platform.
738
# Python 2.4 and later have os.urandom,
739
# but it doesn't work on some arches
287
741
rand_bytes = os.urandom
289
# FIXME: No good on non-Linux
290
_rand_file = file('/dev/urandom', 'rb')
291
rand_bytes = _rand_file.read
742
except (NotImplementedError, AttributeError):
743
# If python doesn't have os.urandom, or it doesn't work,
744
# then try to first pull random data from /dev/urandom
746
rand_bytes = file('/dev/urandom', 'rb').read
747
# Otherwise, use this hack as a last resort
748
except (IOError, OSError):
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# not well seeded, but better than nothing
754
s += chr(random.randint(0, 255))
759
ALNUM = '0123456789abcdefghijklmnopqrstuvwxyz'
761
"""Return a random string of num alphanumeric characters
763
The result only contains lowercase chars because it may be used on
764
case-insensitive filesystems.
767
for raw_byte in rand_bytes(num):
768
s += ALNUM[ord(raw_byte) % 36]
294
772
## TODO: We could later have path objects that remember their list
295
773
## decomposition (might be too tricksy though.)
297
775
def splitpath(p):
298
"""Turn string into list of parts.
304
>>> splitpath('a/./b')
306
>>> splitpath('a/.b')
308
>>> splitpath('a/../b')
309
Traceback (most recent call last):
311
BzrError: ("sorry, '..' not allowed in path", [])
313
assert isinstance(p, types.StringTypes)
776
"""Turn string into list of parts."""
315
777
# split on either delimiter because people might use either on
317
779
ps = re.split(r'[\\/]', p)
330
assert isinstance(p, list)
332
if (f == '..') or (f == None) or (f == ''):
333
bailout("sorry, %r not allowed in path" % f)
334
return os.path.join(*p)
337
def appendpath(p1, p2):
341
return os.path.join(p1, p2)
344
def extern_command(cmd, ignore_errors = False):
345
mutter('external command: %s' % `cmd`)
347
if not ignore_errors:
348
bailout('command failed')
793
if (f == '..') or (f is None) or (f == ''):
794
raise errors.BzrError("sorry, %r not allowed in path" % f)
799
"""Split s into lines, but without removing the newline characters."""
800
lines = s.split('\n')
801
result = [line + '\n' for line in lines[:-1]]
803
result.append(lines[-1])
807
def hardlinks_good():
808
return sys.platform not in ('win32', 'cygwin', 'darwin')
811
def link_or_copy(src, dest):
812
"""Hardlink a file, or copy it if it can't be hardlinked."""
813
if not hardlinks_good():
814
shutil.copyfile(src, dest)
818
except (OSError, IOError), e:
819
if e.errno != errno.EXDEV:
821
shutil.copyfile(src, dest)
824
# Look Before You Leap (LBYL) is appropriate here instead of Easier to Ask for
825
# Forgiveness than Permission (EAFP) because:
826
# - root can damage a solaris file system by using unlink,
827
# - unlink raises different exceptions on different OSes (linux: EISDIR, win32:
828
# EACCES, OSX: EPERM) when invoked on a directory.
829
def delete_any(path):
830
"""Delete a file or directory."""
831
if isdir(path): # Takes care of symlinks
838
if getattr(os, 'symlink', None) is not None:
845
if getattr(os, 'link', None) is not None:
851
def host_os_dereferences_symlinks():
852
return (has_symlinks()
853
and sys.platform not in ('cygwin', 'win32'))
856
def contains_whitespace(s):
857
"""True if there are any whitespace characters in s."""
858
# string.whitespace can include '\xa0' in certain locales, because it is
859
# considered "non-breaking-space" as part of ISO-8859-1. But it
860
# 1) Isn't a breaking whitespace
861
# 2) Isn't one of ' \t\r\n' which are characters we sometimes use as
863
# 3) '\xa0' isn't unicode safe since it is >128.
865
# This should *not* be a unicode set of characters in case the source
866
# string is not a Unicode string. We can auto-up-cast the characters since
867
# they are ascii, but we don't want to auto-up-cast the string in case it
869
for ch in ' \t\n\r\v\f':
876
def contains_linebreaks(s):
877
"""True if there is any vertical whitespace in s."""
885
def relpath(base, path):
886
"""Return path relative to base, or raise exception.
888
The path may be either an absolute path or a path relative to the
889
current working directory.
891
os.path.commonprefix (python2.4) has a bad bug that it works just
892
on string prefixes, assuming that '/u' is a prefix of '/u2'. This
896
if len(base) < MIN_ABS_PATHLENGTH:
897
# must have space for e.g. a drive letter
898
raise ValueError('%r is too short to calculate a relative path'
905
while len(head) >= len(base):
908
head, tail = os.path.split(head)
912
raise errors.PathNotChild(rp, base)
920
def safe_unicode(unicode_or_utf8_string):
921
"""Coerce unicode_or_utf8_string into unicode.
923
If it is unicode, it is returned.
924
Otherwise it is decoded from utf-8. If a decoding error
925
occurs, it is wrapped as a If the decoding fails, the exception is wrapped
926
as a BzrBadParameter exception.
928
if isinstance(unicode_or_utf8_string, unicode):
929
return unicode_or_utf8_string
931
return unicode_or_utf8_string.decode('utf8')
932
except UnicodeDecodeError:
933
raise errors.BzrBadParameterNotUnicode(unicode_or_utf8_string)
936
def safe_utf8(unicode_or_utf8_string):
937
"""Coerce unicode_or_utf8_string to a utf8 string.
939
If it is a str, it is returned.
940
If it is Unicode, it is encoded into a utf-8 string.
942
if isinstance(unicode_or_utf8_string, str):
943
# TODO: jam 20070209 This is overkill, and probably has an impact on
944
# performance if we are dealing with lots of apis that want a
947
# Make sure it is a valid utf-8 string
948
unicode_or_utf8_string.decode('utf-8')
949
except UnicodeDecodeError:
950
raise errors.BzrBadParameterNotUnicode(unicode_or_utf8_string)
951
return unicode_or_utf8_string
952
return unicode_or_utf8_string.encode('utf-8')
955
_revision_id_warning = ('Unicode revision ids were deprecated in bzr 0.15.'
956
' Revision id generators should be creating utf8'
960
def safe_revision_id(unicode_or_utf8_string, warn=True):
961
"""Revision ids should now be utf8, but at one point they were unicode.
963
:param unicode_or_utf8_string: A possibly Unicode revision_id. (can also be
965
:param warn: Functions that are sanitizing user data can set warn=False
966
:return: None or a utf8 revision id.
968
if (unicode_or_utf8_string is None
969
or unicode_or_utf8_string.__class__ == str):
970
return unicode_or_utf8_string
972
symbol_versioning.warn(_revision_id_warning, DeprecationWarning,
974
return cache_utf8.encode(unicode_or_utf8_string)
977
_file_id_warning = ('Unicode file ids were deprecated in bzr 0.15. File id'
978
' generators should be creating utf8 file ids.')
981
def safe_file_id(unicode_or_utf8_string, warn=True):
982
"""File ids should now be utf8, but at one point they were unicode.
984
This is the same as safe_utf8, except it uses the cached encode functions
985
to save a little bit of performance.
987
:param unicode_or_utf8_string: A possibly Unicode file_id. (can also be
989
:param warn: Functions that are sanitizing user data can set warn=False
990
:return: None or a utf8 file id.
992
if (unicode_or_utf8_string is None
993
or unicode_or_utf8_string.__class__ == str):
994
return unicode_or_utf8_string
996
symbol_versioning.warn(_file_id_warning, DeprecationWarning,
998
return cache_utf8.encode(unicode_or_utf8_string)
1001
_platform_normalizes_filenames = False
1002
if sys.platform == 'darwin':
1003
_platform_normalizes_filenames = True
1006
def normalizes_filenames():
1007
"""Return True if this platform normalizes unicode filenames.
1009
Mac OSX does, Windows/Linux do not.
1011
return _platform_normalizes_filenames
1014
def _accessible_normalized_filename(path):
1015
"""Get the unicode normalized path, and if you can access the file.
1017
On platforms where the system normalizes filenames (Mac OSX),
1018
you can access a file by any path which will normalize correctly.
1019
On platforms where the system does not normalize filenames
1020
(Windows, Linux), you have to access a file by its exact path.
1022
Internally, bzr only supports NFC normalization, since that is
1023
the standard for XML documents.
1025
So return the normalized path, and a flag indicating if the file
1026
can be accessed by that path.
1029
return unicodedata.normalize('NFC', unicode(path)), True
1032
def _inaccessible_normalized_filename(path):
1033
__doc__ = _accessible_normalized_filename.__doc__
1035
normalized = unicodedata.normalize('NFC', unicode(path))
1036
return normalized, normalized == path
1039
if _platform_normalizes_filenames:
1040
normalized_filename = _accessible_normalized_filename
1042
normalized_filename = _inaccessible_normalized_filename
1045
def terminal_width():
1046
"""Return estimated terminal width."""
1047
if sys.platform == 'win32':
1048
return win32utils.get_console_size()[0]
1051
import struct, fcntl, termios
1052
s = struct.pack('HHHH', 0, 0, 0, 0)
1053
x = fcntl.ioctl(1, termios.TIOCGWINSZ, s)
1054
width = struct.unpack('HHHH', x)[1]
1059
width = int(os.environ['COLUMNS'])
1068
def supports_executable():
1069
return sys.platform != "win32"
1072
def supports_posix_readonly():
1073
"""Return True if 'readonly' has POSIX semantics, False otherwise.
1075
Notably, a win32 readonly file cannot be deleted, unlike POSIX where the
1076
directory controls creation/deletion, etc.
1078
And under win32, readonly means that the directory itself cannot be
1079
deleted. The contents of a readonly directory can be changed, unlike POSIX
1080
where files in readonly directories cannot be added, deleted or renamed.
1082
return sys.platform != "win32"
1085
def set_or_unset_env(env_variable, value):
1086
"""Modify the environment, setting or removing the env_variable.
1088
:param env_variable: The environment variable in question
1089
:param value: The value to set the environment to. If None, then
1090
the variable will be removed.
1091
:return: The original value of the environment variable.
1093
orig_val = os.environ.get(env_variable)
1095
if orig_val is not None:
1096
del os.environ[env_variable]
1098
if isinstance(value, unicode):
1099
value = value.encode(bzrlib.user_encoding)
1100
os.environ[env_variable] = value
1104
_validWin32PathRE = re.compile(r'^([A-Za-z]:[/\\])?[^:<>*"?\|]*$')
1107
def check_legal_path(path):
1108
"""Check whether the supplied path is legal.
1109
This is only required on Windows, so we don't test on other platforms
1112
if sys.platform != "win32":
1114
if _validWin32PathRE.match(path) is None:
1115
raise errors.IllegalPath(path)
1118
def walkdirs(top, prefix=""):
1119
"""Yield data about all the directories in a tree.
1121
This yields all the data about the contents of a directory at a time.
1122
After each directory has been yielded, if the caller has mutated the list
1123
to exclude some directories, they are then not descended into.
1125
The data yielded is of the form:
1126
((directory-relpath, directory-path-from-top),
1127
[(relpath, basename, kind, lstat, path-from-top), ...]),
1128
- directory-relpath is the relative path of the directory being returned
1129
with respect to top. prefix is prepended to this.
1130
- directory-path-from-root is the path including top for this directory.
1131
It is suitable for use with os functions.
1132
- relpath is the relative path within the subtree being walked.
1133
- basename is the basename of the path
1134
- kind is the kind of the file now. If unknown then the file is not
1135
present within the tree - but it may be recorded as versioned. See
1137
- lstat is the stat data *if* the file was statted.
1138
- planned, not implemented:
1139
path_from_tree_root is the path from the root of the tree.
1141
:param prefix: Prefix the relpaths that are yielded with 'prefix'. This
1142
allows one to walk a subtree but get paths that are relative to a tree
1144
:return: an iterator over the dirs.
1146
#TODO there is a bit of a smell where the results of the directory-
1147
# summary in this, and the path from the root, may not agree
1148
# depending on top and prefix - i.e. ./foo and foo as a pair leads to
1149
# potentially confusing output. We should make this more robust - but
1150
# not at a speed cost. RBC 20060731
1152
_directory = _directory_kind
1153
_listdir = os.listdir
1154
_kind_from_mode = _formats.get
1155
pending = [(safe_unicode(prefix), "", _directory, None, safe_unicode(top))]
1157
# 0 - relpath, 1- basename, 2- kind, 3- stat, 4-toppath
1158
relroot, _, _, _, top = pending.pop()
1160
relprefix = relroot + u'/'
1163
top_slash = top + u'/'
1166
append = dirblock.append
1167
for name in sorted(_listdir(top)):
1168
abspath = top_slash + name
1169
statvalue = _lstat(abspath)
1170
kind = _kind_from_mode(statvalue.st_mode & 0170000, 'unknown')
1171
append((relprefix + name, name, kind, statvalue, abspath))
1172
yield (relroot, top), dirblock
1174
# push the user specified dirs from dirblock
1175
pending.extend(d for d in reversed(dirblock) if d[2] == _directory)
1178
def _walkdirs_utf8(top, prefix=""):
1179
"""Yield data about all the directories in a tree.
1181
This yields the same information as walkdirs() only each entry is yielded
1182
in utf-8. On platforms which have a filesystem encoding of utf8 the paths
1183
are returned as exact byte-strings.
1185
:return: yields a tuple of (dir_info, [file_info])
1186
dir_info is (utf8_relpath, path-from-top)
1187
file_info is (utf8_relpath, utf8_name, kind, lstat, path-from-top)
1188
if top is an absolute path, path-from-top is also an absolute path.
1189
path-from-top might be unicode or utf8, but it is the correct path to
1190
pass to os functions to affect the file in question. (such as os.lstat)
1192
fs_encoding = _fs_enc.upper()
1193
if (sys.platform == 'win32' or
1194
fs_encoding not in ('UTF-8', 'US-ASCII', 'ANSI_X3.4-1968')): # ascii
1195
return _walkdirs_unicode_to_utf8(top, prefix=prefix)
1197
return _walkdirs_fs_utf8(top, prefix=prefix)
1200
def _walkdirs_fs_utf8(top, prefix=""):
1201
"""See _walkdirs_utf8.
1203
This sub-function is called when we know the filesystem is already in utf8
1204
encoding. So we don't need to transcode filenames.
1207
_directory = _directory_kind
1208
_listdir = os.listdir
1209
_kind_from_mode = _formats.get
1211
# 0 - relpath, 1- basename, 2- kind, 3- stat, 4-toppath
1212
# But we don't actually uses 1-3 in pending, so set them to None
1213
pending = [(safe_utf8(prefix), None, None, None, safe_utf8(top))]
1215
relroot, _, _, _, top = pending.pop()
1217
relprefix = relroot + '/'
1220
top_slash = top + '/'
1223
append = dirblock.append
1224
for name in sorted(_listdir(top)):
1225
abspath = top_slash + name
1226
statvalue = _lstat(abspath)
1227
kind = _kind_from_mode(statvalue.st_mode & 0170000, 'unknown')
1228
append((relprefix + name, name, kind, statvalue, abspath))
1229
yield (relroot, top), dirblock
1231
# push the user specified dirs from dirblock
1232
pending.extend(d for d in reversed(dirblock) if d[2] == _directory)
1235
def _walkdirs_unicode_to_utf8(top, prefix=""):
1236
"""See _walkdirs_utf8
1238
Because Win32 has a Unicode api, all of the 'path-from-top' entries will be
1240
This is currently the fallback code path when the filesystem encoding is
1241
not UTF-8. It may be better to implement an alternative so that we can
1242
safely handle paths that are not properly decodable in the current
1245
_utf8_encode = codecs.getencoder('utf8')
1247
_directory = _directory_kind
1248
_listdir = os.listdir
1249
_kind_from_mode = _formats.get
1251
pending = [(safe_utf8(prefix), None, None, None, safe_unicode(top))]
1253
relroot, _, _, _, top = pending.pop()
1255
relprefix = relroot + '/'
1258
top_slash = top + u'/'
1261
append = dirblock.append
1262
for name in sorted(_listdir(top)):
1263
name_utf8 = _utf8_encode(name)[0]
1264
abspath = top_slash + name
1265
statvalue = _lstat(abspath)
1266
kind = _kind_from_mode(statvalue.st_mode & 0170000, 'unknown')
1267
append((relprefix + name_utf8, name_utf8, kind, statvalue, abspath))
1268
yield (relroot, top), dirblock
1270
# push the user specified dirs from dirblock
1271
pending.extend(d for d in reversed(dirblock) if d[2] == _directory)
1274
def copy_tree(from_path, to_path, handlers={}):
1275
"""Copy all of the entries in from_path into to_path.
1277
:param from_path: The base directory to copy.
1278
:param to_path: The target directory. If it does not exist, it will
1280
:param handlers: A dictionary of functions, which takes a source and
1281
destinations for files, directories, etc.
1282
It is keyed on the file kind, such as 'directory', 'symlink', or 'file'
1283
'file', 'directory', and 'symlink' should always exist.
1284
If they are missing, they will be replaced with 'os.mkdir()',
1285
'os.readlink() + os.symlink()', and 'shutil.copy2()', respectively.
1287
# Now, just copy the existing cached tree to the new location
1288
# We use a cheap trick here.
1289
# Absolute paths are prefixed with the first parameter
1290
# relative paths are prefixed with the second.
1291
# So we can get both the source and target returned
1292
# without any extra work.
1294
def copy_dir(source, dest):
1297
def copy_link(source, dest):
1298
"""Copy the contents of a symlink"""
1299
link_to = os.readlink(source)
1300
os.symlink(link_to, dest)
1302
real_handlers = {'file':shutil.copy2,
1303
'symlink':copy_link,
1304
'directory':copy_dir,
1306
real_handlers.update(handlers)
1308
if not os.path.exists(to_path):
1309
real_handlers['directory'](from_path, to_path)
1311
for dir_info, entries in walkdirs(from_path, prefix=to_path):
1312
for relpath, name, kind, st, abspath in entries:
1313
real_handlers[kind](abspath, relpath)
1316
def path_prefix_key(path):
1317
"""Generate a prefix-order path key for path.
1319
This can be used to sort paths in the same way that walkdirs does.
1321
return (dirname(path) , path)
1324
def compare_paths_prefix_order(path_a, path_b):
1325
"""Compare path_a and path_b to generate the same order walkdirs uses."""
1326
key_a = path_prefix_key(path_a)
1327
key_b = path_prefix_key(path_b)
1328
return cmp(key_a, key_b)
1331
_cached_user_encoding = None
1334
def get_user_encoding(use_cache=True):
1335
"""Find out what the preferred user encoding is.
1337
This is generally the encoding that is used for command line parameters
1338
and file contents. This may be different from the terminal encoding
1339
or the filesystem encoding.
1341
:param use_cache: Enable cache for detected encoding.
1342
(This parameter is turned on by default,
1343
and required only for selftesting)
1345
:return: A string defining the preferred user encoding
1347
global _cached_user_encoding
1348
if _cached_user_encoding is not None and use_cache:
1349
return _cached_user_encoding
1351
if sys.platform == 'darwin':
1352
# work around egregious python 2.4 bug
1353
sys.platform = 'posix'
1357
sys.platform = 'darwin'
1362
user_encoding = locale.getpreferredencoding()
1363
except locale.Error, e:
1364
sys.stderr.write('bzr: warning: %s\n'
1365
' Could not determine what text encoding to use.\n'
1366
' This error usually means your Python interpreter\n'
1367
' doesn\'t support the locale set by $LANG (%s)\n'
1368
" Continuing with ascii encoding.\n"
1369
% (e, os.environ.get('LANG')))
1370
user_encoding = 'ascii'
1372
# Windows returns 'cp0' to indicate there is no code page. So we'll just
1373
# treat that as ASCII, and not support printing unicode characters to the
1376
# For python scripts run under vim, we get '', so also treat that as ASCII
1377
if user_encoding in (None, 'cp0', ''):
1378
user_encoding = 'ascii'
1382
codecs.lookup(user_encoding)
1384
sys.stderr.write('bzr: warning:'
1385
' unknown encoding %s.'
1386
' Continuing with ascii encoding.\n'
1389
user_encoding = 'ascii'
1392
_cached_user_encoding = user_encoding
1394
return user_encoding
1397
def recv_all(socket, bytes):
1398
"""Receive an exact number of bytes.
1400
Regular Socket.recv() may return less than the requested number of bytes,
1401
dependning on what's in the OS buffer. MSG_WAITALL is not available
1402
on all platforms, but this should work everywhere. This will return
1403
less than the requested amount if the remote end closes.
1405
This isn't optimized and is intended mostly for use in testing.
1408
while len(b) < bytes:
1409
new = socket.recv(bytes - len(b))
1416
def send_all(socket, bytes):
1417
"""Send all bytes on a socket.
1419
Regular socket.sendall() can give socket error 10053 on Windows. This
1420
implementation sends no more than 64k at a time, which avoids this problem.
1423
for pos in xrange(0, len(bytes), chunk_size):
1424
socket.sendall(bytes[pos:pos+chunk_size])
1427
def dereference_path(path):
1428
"""Determine the real path to a file.
1430
All parent elements are dereferenced. But the file itself is not
1432
:param path: The original path. May be absolute or relative.
1433
:return: the real path *to* the file
1435
parent, base = os.path.split(path)
1436
# The pathjoin for '.' is a workaround for Python bug #1213894.
1437
# (initial path components aren't dereferenced)
1438
return pathjoin(realpath(pathjoin('.', parent)), base)
1441
def supports_mapi():
1442
"""Return True if we can use MAPI to launch a mail client."""
1443
return sys.platform == "win32"
1446
def resource_string(package, resource_name):
1447
"""Load a resource from a package and return it as a string.
1449
Note: Only packages that start with bzrlib are currently supported.
1451
This is designed to be a lightweight implementation of resource
1452
loading in a way which is API compatible with the same API from
1454
http://peak.telecommunity.com/DevCenter/PkgResources#basic-resource-access.
1455
If and when pkg_resources becomes a standard library, this routine
1458
# Check package name is within bzrlib
1459
if package == "bzrlib":
1460
resource_relpath = resource_name
1461
elif package.startswith("bzrlib."):
1462
package = package[len("bzrlib."):].replace('.', os.sep)
1463
resource_relpath = pathjoin(package, resource_name)
1465
raise errors.BzrError('resource package %s not in bzrlib' % package)
1467
# Map the resource to a file and read its contents
1468
base = dirname(bzrlib.__file__)
1469
if getattr(sys, 'frozen', None): # bzr.exe
1470
base = abspath(pathjoin(base, '..', '..'))
1471
filename = pathjoin(base, resource_relpath)
1472
return open(filename, 'rU').read()
added
removed
bzrlib/osutils.py
