# Copyright (C) 2005, 2006, 2007 Canonical Ltd # # This program is free software; you can redistribute it and/or modify # it under the terms of the GNU General Public License as published by # the Free Software Foundation; either version 2 of the License, or # (at your option) any later version. # # This program is distributed in the hope that it will be useful, # but WITHOUT ANY WARRANTY; without even the implied warranty of # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the # GNU General Public License for more details. # # You should have received a copy of the GNU General Public License # along with this program; if not, write to the Free Software # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA from cStringIO import StringIO import os import re import stat from stat import (S_ISREG, S_ISDIR, S_ISLNK, ST_MODE, ST_SIZE, S_ISCHR, S_ISBLK, S_ISFIFO, S_ISSOCK) import sys import time from bzrlib.lazy_import import lazy_import lazy_import(globals(), """ import codecs from datetime import datetime import errno from ntpath import (abspath as _nt_abspath, join as _nt_join, normpath as _nt_normpath, realpath as _nt_realpath, splitdrive as _nt_splitdrive, ) import posixpath import sha import shutil from shutil import ( rmtree, ) import tempfile from tempfile import ( mkdtemp, ) import unicodedata from bzrlib import ( cache_utf8, errors, win32utils, ) """) import bzrlib from bzrlib import symbol_versioning from bzrlib.symbol_versioning import ( deprecated_function, one_zero, ) from bzrlib.trace import mutter # On win32, O_BINARY is used to indicate the file should # be opened in binary mode, rather than text mode. # On other platforms, O_BINARY doesn't exist, because # they always open in binary mode, so it is okay to # OR with 0 on those platforms O_BINARY = getattr(os, 'O_BINARY', 0) def make_readonly(filename): """Make a filename read-only.""" mod = os.lstat(filename).st_mode if not stat.S_ISLNK(mod): mod = mod & 0777555 os.chmod(filename, mod) def make_writable(filename): mod = os.lstat(filename).st_mode if not stat.S_ISLNK(mod): mod = mod | 0200 os.chmod(filename, mod) def minimum_path_selection(paths): """Return the smallset subset of paths which are outside paths. :param paths: A container (and hence not None) of paths. :return: A set of paths sufficient to include everything in paths via is_inside_any, drawn from the paths parameter. """ search_paths = set() paths = set(paths) for path in paths: other_paths = paths.difference([path]) if not is_inside_any(other_paths, path): # this is a top level path, we must check it. search_paths.add(path) return search_paths _QUOTE_RE = None def quotefn(f): """Return a quoted filename filename This previously used backslash quoting, but that works poorly on Windows.""" # TODO: I'm not really sure this is the best format either.x global _QUOTE_RE if _QUOTE_RE is None: _QUOTE_RE = re.compile(r'([^a-zA-Z0-9.,:/\\_~-])') if _QUOTE_RE.search(f): return '"' + f + '"' else: return f _directory_kind = 'directory' _formats = { stat.S_IFDIR:_directory_kind, stat.S_IFCHR:'chardev', stat.S_IFBLK:'block', stat.S_IFREG:'file', stat.S_IFIFO:'fifo', stat.S_IFLNK:'symlink', stat.S_IFSOCK:'socket', } def file_kind_from_stat_mode(stat_mode, _formats=_formats, _unknown='unknown'): """Generate a file kind from a stat mode. This is used in walkdirs. Its performance is critical: Do not mutate without careful benchmarking. """ try: return _formats[stat_mode & 0170000] except KeyError: return _unknown def file_kind(f, _lstat=os.lstat, _mapper=file_kind_from_stat_mode): try: return _mapper(_lstat(f).st_mode) except OSError, e: if getattr(e, 'errno', None) == errno.ENOENT: raise errors.NoSuchFile(f) raise def get_umask(): """Return the current umask""" # Assume that people aren't messing with the umask while running # XXX: This is not thread safe, but there is no way to get the # umask without setting it umask = os.umask(0) os.umask(umask) return umask _kind_marker_map = { "file": "", _directory_kind: "/", "symlink": "@", 'tree-reference': '+', } def kind_marker(kind): try: return _kind_marker_map[kind] except KeyError: raise errors.BzrError('invalid file kind %r' % kind) lexists = getattr(os.path, 'lexists', None) if lexists is None: def lexists(f): try: stat = getattr(os, 'lstat', os.stat) stat(f) return True except OSError, e: if e.errno == errno.ENOENT: return False; else: raise errors.BzrError("lstat/stat of (%r): %r" % (f, e)) def fancy_rename(old, new, rename_func, unlink_func): """A fancy rename, when you don't have atomic rename. :param old: The old path, to rename from :param new: The new path, to rename to :param rename_func: The potentially non-atomic rename function :param unlink_func: A way to delete the target file if the full rename succeeds """ # sftp rename doesn't allow overwriting, so play tricks: import random base = os.path.basename(new) dirname = os.path.dirname(new) tmp_name = u'tmp.%s.%.9f.%d.%s' % (base, time.time(), os.getpid(), rand_chars(10)) tmp_name = pathjoin(dirname, tmp_name) # Rename the file out of the way, but keep track if it didn't exist # We don't want to grab just any exception # something like EACCES should prevent us from continuing # The downside is that the rename_func has to throw an exception # with an errno = ENOENT, or NoSuchFile file_existed = False try: rename_func(new, tmp_name) except (errors.NoSuchFile,), e: pass except IOError, e: # RBC 20060103 abstraction leakage: the paramiko SFTP clients rename # function raises an IOError with errno is None when a rename fails. # This then gets caught here. if e.errno not in (None, errno.ENOENT, errno.ENOTDIR): raise except Exception, e: if (getattr(e, 'errno', None) is None or e.errno not in (errno.ENOENT, errno.ENOTDIR)): raise else: file_existed = True success = False try: try: # This may throw an exception, in which case success will # not be set. rename_func(old, new) success = True except (IOError, OSError), e: # source and target may be aliases of each other (e.g. on a # case-insensitive filesystem), so we may have accidentally renamed # source by when we tried to rename target if not (file_existed and e.errno in (None, errno.ENOENT)): raise finally: if file_existed: # If the file used to exist, rename it back into place # otherwise just delete it from the tmp location if success: unlink_func(tmp_name) else: rename_func(tmp_name, new) # In Python 2.4.2 and older, os.path.abspath and os.path.realpath # choke on a Unicode string containing a relative path if # os.getcwd() returns a non-sys.getdefaultencoding()-encoded # string. _fs_enc = sys.getfilesystemencoding() or 'utf-8' def _posix_abspath(path): # jam 20060426 rather than encoding to fsencoding # copy posixpath.abspath, but use os.getcwdu instead if not posixpath.isabs(path): path = posixpath.join(getcwd(), path) return posixpath.normpath(path) def _posix_realpath(path): return posixpath.realpath(path.encode(_fs_enc)).decode(_fs_enc) def _win32_fixdrive(path): """Force drive letters to be consistent. win32 is inconsistent whether it returns lower or upper case and even if it was consistent the user might type the other so we force it to uppercase running python.exe under cmd.exe return capital C:\\ running win32 python inside a cygwin shell returns lowercase c:\\ """ drive, path = _nt_splitdrive(path) return drive.upper() + path def _win32_abspath(path): # Real _nt_abspath doesn't have a problem with a unicode cwd return _win32_fixdrive(_nt_abspath(unicode(path)).replace('\\', '/')) def _win98_abspath(path): """Return the absolute version of a path. Windows 98 safe implementation (python reimplementation of Win32 API function GetFullPathNameW) """ # Corner cases: # C:\path => C:/path # C:/path => C:/path # \\HOST\path => //HOST/path # //HOST/path => //HOST/path # path => C:/cwd/path # /path => C:/path path = unicode(path) # check for absolute path drive = _nt_splitdrive(path)[0] if drive == '' and path[:2] not in('//','\\\\'): cwd = os.getcwdu() # we cannot simply os.path.join cwd and path # because os.path.join('C:','/path') produce '/path' # and this is incorrect if path[:1] in ('/','\\'): cwd = _nt_splitdrive(cwd)[0] path = path[1:] path = cwd + '\\' + path return _win32_fixdrive(_nt_normpath(path).replace('\\', '/')) if win32utils.winver == 'Windows 98': _win32_abspath = _win98_abspath def _win32_realpath(path): # Real _nt_realpath doesn't have a problem with a unicode cwd return _win32_fixdrive(_nt_realpath(unicode(path)).replace('\\', '/')) def _win32_pathjoin(*args): return _nt_join(*args).replace('\\', '/') def _win32_normpath(path): return _win32_fixdrive(_nt_normpath(unicode(path)).replace('\\', '/')) def _win32_getcwd(): return _win32_fixdrive(os.getcwdu().replace('\\', '/')) def _win32_mkdtemp(*args, **kwargs): return _win32_fixdrive(tempfile.mkdtemp(*args, **kwargs).replace('\\', '/')) def _win32_rename(old, new): """We expect to be able to atomically replace 'new' with old. On win32, if new exists, it must be moved out of the way first, and then deleted. """ try: fancy_rename(old, new, rename_func=os.rename, unlink_func=os.unlink) except OSError, e: if e.errno in (errno.EPERM, errno.EACCES, errno.EBUSY, errno.EINVAL): # If we try to rename a non-existant file onto cwd, we get # EPERM or EACCES instead of ENOENT, this will raise ENOENT # if the old path doesn't exist, sometimes we get EACCES # On Linux, we seem to get EBUSY, on Mac we get EINVAL os.lstat(old) raise def _mac_getcwd(): return unicodedata.normalize('NFC', os.getcwdu()) # Default is to just use the python builtins, but these can be rebound on # particular platforms. abspath = _posix_abspath realpath = _posix_realpath pathjoin = os.path.join normpath = os.path.normpath getcwd = os.getcwdu rename = os.rename dirname = os.path.dirname basename = os.path.basename split = os.path.split splitext = os.path.splitext # These were already imported into local scope # mkdtemp = tempfile.mkdtemp # rmtree = shutil.rmtree MIN_ABS_PATHLENGTH = 1 if sys.platform == 'win32': abspath = _win32_abspath realpath = _win32_realpath pathjoin = _win32_pathjoin normpath = _win32_normpath getcwd = _win32_getcwd mkdtemp = _win32_mkdtemp rename = _win32_rename MIN_ABS_PATHLENGTH = 3 def _win32_delete_readonly(function, path, excinfo): """Error handler for shutil.rmtree function [for win32] Helps to remove files and dirs marked as read-only. """ exception = excinfo[1] if function in (os.remove, os.rmdir) \ and isinstance(exception, OSError) \ and exception.errno == errno.EACCES: make_writable(path) function(path) else: raise def rmtree(path, ignore_errors=False, onerror=_win32_delete_readonly): """Replacer for shutil.rmtree: could remove readonly dirs/files""" return shutil.rmtree(path, ignore_errors, onerror) elif sys.platform == 'darwin': getcwd = _mac_getcwd def get_terminal_encoding(): """Find the best encoding for printing to the screen. This attempts to check both sys.stdout and sys.stdin to see what encoding they are in, and if that fails it falls back to bzrlib.user_encoding. The problem is that on Windows, locale.getpreferredencoding() is not the same encoding as that used by the console: http://mail.python.org/pipermail/python-list/2003-May/162357.html On my standard US Windows XP, the preferred encoding is cp1252, but the console is cp437 """ output_encoding = getattr(sys.stdout, 'encoding', None) if not output_encoding: input_encoding = getattr(sys.stdin, 'encoding', None) if not input_encoding: output_encoding = bzrlib.user_encoding mutter('encoding stdout as bzrlib.user_encoding %r', output_encoding) else: output_encoding = input_encoding mutter('encoding stdout as sys.stdin encoding %r', output_encoding) else: mutter('encoding stdout as sys.stdout encoding %r', output_encoding) if output_encoding == 'cp0': # invalid encoding (cp0 means 'no codepage' on Windows) output_encoding = bzrlib.user_encoding mutter('cp0 is invalid encoding.' ' encoding stdout as bzrlib.user_encoding %r', output_encoding) # check encoding try: codecs.lookup(output_encoding) except LookupError: sys.stderr.write('bzr: warning:' ' unknown terminal encoding %s.\n' ' Using encoding %s instead.\n' % (output_encoding, bzrlib.user_encoding) ) output_encoding = bzrlib.user_encoding return output_encoding def normalizepath(f): if getattr(os.path, 'realpath', None) is not None: F = realpath else: F = abspath [p,e] = os.path.split(f) if e == "" or e == "." or e == "..": return F(f) else: return pathjoin(F(p), e) @deprecated_function(one_zero) def backup_file(fn): """Copy a file to a backup. Backups are named in GNU-style, with a ~ suffix. If the file is already a backup, it's not copied. """ if fn[-1] == '~': return bfn = fn + '~' if has_symlinks() and os.path.islink(fn): target = os.readlink(fn) os.symlink(target, bfn) return inf = file(fn, 'rb') try: content = inf.read() finally: inf.close() outf = file(bfn, 'wb') try: outf.write(content) finally: outf.close() def isdir(f): """True if f is an accessible directory.""" try: return S_ISDIR(os.lstat(f)[ST_MODE]) except OSError: return False def isfile(f): """True if f is a regular file.""" try: return S_ISREG(os.lstat(f)[ST_MODE]) except OSError: return False def islink(f): """True if f is a symlink.""" try: return S_ISLNK(os.lstat(f)[ST_MODE]) except OSError: return False def is_inside(dir, fname): """True if fname is inside dir. The parameters should typically be passed to osutils.normpath first, so that . and .. and repeated slashes are eliminated, and the separators are canonical for the platform. The empty string as a dir name is taken as top-of-tree and matches everything. """ # XXX: Most callers of this can actually do something smarter by # looking at the inventory if dir == fname: return True if dir == '': return True if dir[-1] != '/': dir += '/' return fname.startswith(dir) def is_inside_any(dir_list, fname): """True if fname is inside any of given dirs.""" for dirname in dir_list: if is_inside(dirname, fname): return True return False def is_inside_or_parent_of_any(dir_list, fname): """True if fname is a child or a parent of any of the given files.""" for dirname in dir_list: if is_inside(dirname, fname) or is_inside(fname, dirname): return True return False def pumpfile(fromfile, tofile): """Copy contents of one file to another. :return: The number of bytes copied. """ BUFSIZE = 32768 length = 0 while True: b = fromfile.read(BUFSIZE) if not b: break tofile.write(b) length += len(b) return length def file_iterator(input_file, readsize=32768): while True: b = input_file.read(readsize) if len(b) == 0: break yield b def sha_file(f): if getattr(f, 'tell', None) is not None: assert f.tell() == 0 s = sha.new() BUFSIZE = 128<<10 while True: b = f.read(BUFSIZE) if not b: break s.update(b) return s.hexdigest() def sha_file_by_name(fname): """Calculate the SHA1 of a file by reading the full text""" s = sha.new() f = os.open(fname, os.O_RDONLY | O_BINARY) try: while True: b = os.read(f, 1<<16) if not b: return s.hexdigest() s.update(b) finally: os.close(f) def sha_strings(strings, _factory=sha.new): """Return the sha-1 of concatenation of strings""" s = _factory() map(s.update, strings) return s.hexdigest() def sha_string(f, _factory=sha.new): return _factory(f).hexdigest() def fingerprint_file(f): b = f.read() return {'size': len(b), 'sha1': sha.new(b).hexdigest()} def compare_files(a, b): """Returns true if equal in contents""" BUFSIZE = 4096 while True: ai = a.read(BUFSIZE) bi = b.read(BUFSIZE) if ai != bi: return False if ai == '': return True def local_time_offset(t=None): """Return offset of local zone from GMT, either at present or at time t.""" if t is None: t = time.time() offset = datetime.fromtimestamp(t) - datetime.utcfromtimestamp(t) return offset.days * 86400 + offset.seconds def format_date(t, offset=0, timezone='original', date_fmt=None, show_offset=True): """Return a formatted date string. :param t: Seconds since the epoch. :param offset: Timezone offset in seconds east of utc. :param timezone: How to display the time: 'utc', 'original' for the timezone specified by offset, or 'local' for the process's current timezone. :param show_offset: Whether to append the timezone. :param date_fmt: strftime format. """ if timezone == 'utc': tt = time.gmtime(t) offset = 0 elif timezone == 'original': if offset is None: offset = 0 tt = time.gmtime(t + offset) elif timezone == 'local': tt = time.localtime(t) offset = local_time_offset(t) else: raise errors.UnsupportedTimezoneFormat(timezone) if date_fmt is None: date_fmt = "%a %Y-%m-%d %H:%M:%S" if show_offset: offset_str = ' %+03d%02d' % (offset / 3600, (offset / 60) % 60) else: offset_str = '' return (time.strftime(date_fmt, tt) + offset_str) def compact_date(when): return time.strftime('%Y%m%d%H%M%S', time.gmtime(when)) def format_delta(delta): """Get a nice looking string for a time delta. :param delta: The time difference in seconds, can be positive or negative. positive indicates time in the past, negative indicates time in the future. (usually time.time() - stored_time) :return: String formatted to show approximate resolution """ delta = int(delta) if delta >= 0: direction = 'ago' else: direction = 'in the future' delta = -delta seconds = delta if seconds < 90: # print seconds up to 90 seconds if seconds == 1: return '%d second %s' % (seconds, direction,) else: return '%d seconds %s' % (seconds, direction) minutes = int(seconds / 60) seconds -= 60 * minutes if seconds == 1: plural_seconds = '' else: plural_seconds = 's' if minutes < 90: # print minutes, seconds up to 90 minutes if minutes == 1: return '%d minute, %d second%s %s' % ( minutes, seconds, plural_seconds, direction) else: return '%d minutes, %d second%s %s' % ( minutes, seconds, plural_seconds, direction) hours = int(minutes / 60) minutes -= 60 * hours if minutes == 1: plural_minutes = '' else: plural_minutes = 's' if hours == 1: return '%d hour, %d minute%s %s' % (hours, minutes, plural_minutes, direction) return '%d hours, %d minute%s %s' % (hours, minutes, plural_minutes, direction) def filesize(f): """Return size of given open file.""" return os.fstat(f.fileno())[ST_SIZE] # Define rand_bytes based on platform. try: # Python 2.4 and later have os.urandom, # but it doesn't work on some arches os.urandom(1) rand_bytes = os.urandom except (NotImplementedError, AttributeError): # If python doesn't have os.urandom, or it doesn't work, # then try to first pull random data from /dev/urandom try: rand_bytes = file('/dev/urandom', 'rb').read # Otherwise, use this hack as a last resort except (IOError, OSError): # not well seeded, but better than nothing def rand_bytes(n): import random s = '' while n: s += chr(random.randint(0, 255)) n -= 1 return s ALNUM = '0123456789abcdefghijklmnopqrstuvwxyz' def rand_chars(num): """Return a random string of num alphanumeric characters The result only contains lowercase chars because it may be used on case-insensitive filesystems. """ s = '' for raw_byte in rand_bytes(num): s += ALNUM[ord(raw_byte) % 36] return s ## TODO: We could later have path objects that remember their list ## decomposition (might be too tricksy though.) def splitpath(p): """Turn string into list of parts.""" assert isinstance(p, basestring) # split on either delimiter because people might use either on # Windows ps = re.split(r'[\\/]', p) rps = [] for f in ps: if f == '..': raise errors.BzrError("sorry, %r not allowed in path" % f) elif (f == '.') or (f == ''): pass else: rps.append(f) return rps def joinpath(p): assert isinstance(p, (list, tuple)) for f in p: if (f == '..') or (f is None) or (f == ''): raise errors.BzrError("sorry, %r not allowed in path" % f) return pathjoin(*p) def split_lines(s): """Split s into lines, but without removing the newline characters.""" lines = s.split('\n') result = [line + '\n' for line in lines[:-1]] if lines[-1]: result.append(lines[-1]) return result def hardlinks_good(): return sys.platform not in ('win32', 'cygwin', 'darwin') def link_or_copy(src, dest): """Hardlink a file, or copy it if it can't be hardlinked.""" if not hardlinks_good(): shutil.copyfile(src, dest) return try: os.link(src, dest) except (OSError, IOError), e: if e.errno != errno.EXDEV: raise shutil.copyfile(src, dest) # Look Before You Leap (LBYL) is appropriate here instead of Easier to Ask for # Forgiveness than Permission (EAFP) because: # - root can damage a solaris file system by using unlink, # - unlink raises different exceptions on different OSes (linux: EISDIR, win32: # EACCES, OSX: EPERM) when invoked on a directory. def delete_any(path): """Delete a file or directory.""" if isdir(path): # Takes care of symlinks os.rmdir(path) else: os.unlink(path) def has_symlinks(): if getattr(os, 'symlink', None) is not None: return True else: return False def contains_whitespace(s): """True if there are any whitespace characters in s.""" # string.whitespace can include '\xa0' in certain locales, because it is # considered "non-breaking-space" as part of ISO-8859-1. But it # 1) Isn't a breaking whitespace # 2) Isn't one of ' \t\r\n' which are characters we sometimes use as # separators # 3) '\xa0' isn't unicode safe since it is >128. # This should *not* be a unicode set of characters in case the source # string is not a Unicode string. We can auto-up-cast the characters since # they are ascii, but we don't want to auto-up-cast the string in case it # is utf-8 for ch in ' \t\n\r\v\f': if ch in s: return True else: return False def contains_linebreaks(s): """True if there is any vertical whitespace in s.""" for ch in '\f\n\r': if ch in s: return True else: return False def relpath(base, path): """Return path relative to base, or raise exception. The path may be either an absolute path or a path relative to the current working directory. os.path.commonprefix (python2.4) has a bad bug that it works just on string prefixes, assuming that '/u' is a prefix of '/u2'. This avoids that problem. """ assert len(base) >= MIN_ABS_PATHLENGTH, ('Length of base must be equal or' ' exceed the platform minimum length (which is %d)' % MIN_ABS_PATHLENGTH) rp = abspath(path) s = [] head = rp while len(head) >= len(base): if head == base: break head, tail = os.path.split(head) if tail: s.insert(0, tail) else: raise errors.PathNotChild(rp, base) if s: return pathjoin(*s) else: return '' def safe_unicode(unicode_or_utf8_string): """Coerce unicode_or_utf8_string into unicode. If it is unicode, it is returned. Otherwise it is decoded from utf-8. If a decoding error occurs, it is wrapped as a If the decoding fails, the exception is wrapped as a BzrBadParameter exception. """ if isinstance(unicode_or_utf8_string, unicode): return unicode_or_utf8_string try: return unicode_or_utf8_string.decode('utf8') except UnicodeDecodeError: raise errors.BzrBadParameterNotUnicode(unicode_or_utf8_string) def safe_utf8(unicode_or_utf8_string): """Coerce unicode_or_utf8_string to a utf8 string. If it is a str, it is returned. If it is Unicode, it is encoded into a utf-8 string. """ if isinstance(unicode_or_utf8_string, str): # TODO: jam 20070209 This is overkill, and probably has an impact on # performance if we are dealing with lots of apis that want a # utf-8 revision id try: # Make sure it is a valid utf-8 string unicode_or_utf8_string.decode('utf-8') except UnicodeDecodeError: raise errors.BzrBadParameterNotUnicode(unicode_or_utf8_string) return unicode_or_utf8_string return unicode_or_utf8_string.encode('utf-8') _revision_id_warning = ('Unicode revision ids were deprecated in bzr 0.15.' ' Revision id generators should be creating utf8' ' revision ids.') def safe_revision_id(unicode_or_utf8_string, warn=True): """Revision ids should now be utf8, but at one point they were unicode. :param unicode_or_utf8_string: A possibly Unicode revision_id. (can also be utf8 or None). :param warn: Functions that are sanitizing user data can set warn=False :return: None or a utf8 revision id. """ if (unicode_or_utf8_string is None or unicode_or_utf8_string.__class__ == str): return unicode_or_utf8_string if warn: symbol_versioning.warn(_revision_id_warning, DeprecationWarning, stacklevel=2) return cache_utf8.encode(unicode_or_utf8_string) _file_id_warning = ('Unicode file ids were deprecated in bzr 0.15. File id' ' generators should be creating utf8 file ids.') def safe_file_id(unicode_or_utf8_string, warn=True): """File ids should now be utf8, but at one point they were unicode. This is the same as safe_utf8, except it uses the cached encode functions to save a little bit of performance. :param unicode_or_utf8_string: A possibly Unicode file_id. (can also be utf8 or None). :param warn: Functions that are sanitizing user data can set warn=False :return: None or a utf8 file id. """ if (unicode_or_utf8_string is None or unicode_or_utf8_string.__class__ == str): return unicode_or_utf8_string if warn: symbol_versioning.warn(_file_id_warning, DeprecationWarning, stacklevel=2) return cache_utf8.encode(unicode_or_utf8_string) _platform_normalizes_filenames = False if sys.platform == 'darwin': _platform_normalizes_filenames = True def normalizes_filenames(): """Return True if this platform normalizes unicode filenames. Mac OSX does, Windows/Linux do not. """ return _platform_normalizes_filenames def _accessible_normalized_filename(path): """Get the unicode normalized path, and if you can access the file. On platforms where the system normalizes filenames (Mac OSX), you can access a file by any path which will normalize correctly. On platforms where the system does not normalize filenames (Windows, Linux), you have to access a file by its exact path. Internally, bzr only supports NFC normalization, since that is the standard for XML documents. So return the normalized path, and a flag indicating if the file can be accessed by that path. """ return unicodedata.normalize('NFC', unicode(path)), True def _inaccessible_normalized_filename(path): __doc__ = _accessible_normalized_filename.__doc__ normalized = unicodedata.normalize('NFC', unicode(path)) return normalized, normalized == path if _platform_normalizes_filenames: normalized_filename = _accessible_normalized_filename else: normalized_filename = _inaccessible_normalized_filename def terminal_width(): """Return estimated terminal width.""" if sys.platform == 'win32': return win32utils.get_console_size()[0] width = 0 try: import struct, fcntl, termios s = struct.pack('HHHH', 0, 0, 0, 0) x = fcntl.ioctl(1, termios.TIOCGWINSZ, s) width = struct.unpack('HHHH', x)[1] except IOError: pass if width <= 0: try: width = int(os.environ['COLUMNS']) except: pass if width <= 0: width = 80 return width def supports_executable(): return sys.platform != "win32" def supports_posix_readonly(): """Return True if 'readonly' has POSIX semantics, False otherwise. Notably, a win32 readonly file cannot be deleted, unlike POSIX where the directory controls creation/deletion, etc. And under win32, readonly means that the directory itself cannot be deleted. The contents of a readonly directory can be changed, unlike POSIX where files in readonly directories cannot be added, deleted or renamed. """ return sys.platform != "win32" def set_or_unset_env(env_variable, value): """Modify the environment, setting or removing the env_variable. :param env_variable: The environment variable in question :param value: The value to set the environment to. If None, then the variable will be removed. :return: The original value of the environment variable. """ orig_val = os.environ.get(env_variable) if value is None: if orig_val is not None: del os.environ[env_variable] else: if isinstance(value, unicode): value = value.encode(bzrlib.user_encoding) os.environ[env_variable] = value return orig_val _validWin32PathRE = re.compile(r'^([A-Za-z]:[/\\])?[^:<>*"?\|]*$') def check_legal_path(path): """Check whether the supplied path is legal. This is only required on Windows, so we don't test on other platforms right now. """ if sys.platform != "win32": return if _validWin32PathRE.match(path) is None: raise errors.IllegalPath(path) def walkdirs(top, prefix=""): """Yield data about all the directories in a tree. This yields all the data about the contents of a directory at a time. After each directory has been yielded, if the caller has mutated the list to exclude some directories, they are then not descended into. The data yielded is of the form: ((directory-relpath, directory-path-from-top), [(relpath, basename, kind, lstat, path-from-top), ...]), - directory-relpath is the relative path of the directory being returned with respect to top. prefix is prepended to this. - directory-path-from-root is the path including top for this directory. It is suitable for use with os functions. - relpath is the relative path within the subtree being walked. - basename is the basename of the path - kind is the kind of the file now. If unknown then the file is not present within the tree - but it may be recorded as versioned. See versioned_kind. - lstat is the stat data *if* the file was statted. - planned, not implemented: path_from_tree_root is the path from the root of the tree. :param prefix: Prefix the relpaths that are yielded with 'prefix'. This allows one to walk a subtree but get paths that are relative to a tree rooted higher up. :return: an iterator over the dirs. """ #TODO there is a bit of a smell where the results of the directory- # summary in this, and the path from the root, may not agree # depending on top and prefix - i.e. ./foo and foo as a pair leads to # potentially confusing output. We should make this more robust - but # not at a speed cost. RBC 20060731 _lstat = os.lstat _directory = _directory_kind _listdir = os.listdir _kind_from_mode = _formats.get pending = [(safe_unicode(prefix), "", _directory, None, safe_unicode(top))] while pending: # 0 - relpath, 1- basename, 2- kind, 3- stat, 4-toppath relroot, _, _, _, top = pending.pop() if relroot: relprefix = relroot + u'/' else: relprefix = '' top_slash = top + u'/' dirblock = [] append = dirblock.append for name in sorted(_listdir(top)): abspath = top_slash + name statvalue = _lstat(abspath) kind = _kind_from_mode(statvalue.st_mode & 0170000, 'unknown') append((relprefix + name, name, kind, statvalue, abspath)) yield (relroot, top), dirblock # push the user specified dirs from dirblock pending.extend(d for d in reversed(dirblock) if d[2] == _directory) def _walkdirs_utf8(top, prefix=""): """Yield data about all the directories in a tree. This yields the same information as walkdirs() only each entry is yielded in utf-8. On platforms which have a filesystem encoding of utf8 the paths are returned as exact byte-strings. :return: yields a tuple of (dir_info, [file_info]) dir_info is (utf8_relpath, path-from-top) file_info is (utf8_relpath, utf8_name, kind, lstat, path-from-top) if top is an absolute path, path-from-top is also an absolute path. path-from-top might be unicode or utf8, but it is the correct path to pass to os functions to affect the file in question. (such as os.lstat) """ fs_encoding = _fs_enc.upper() if (sys.platform == 'win32' or fs_encoding not in ('UTF-8', 'US-ASCII', 'ANSI_X3.4-1968')): # ascii return _walkdirs_unicode_to_utf8(top, prefix=prefix) else: return _walkdirs_fs_utf8(top, prefix=prefix) def _walkdirs_fs_utf8(top, prefix=""): """See _walkdirs_utf8. This sub-function is called when we know the filesystem is already in utf8 encoding. So we don't need to transcode filenames. """ _lstat = os.lstat _directory = _directory_kind _listdir = os.listdir _kind_from_mode = _formats.get # 0 - relpath, 1- basename, 2- kind, 3- stat, 4-toppath # But we don't actually uses 1-3 in pending, so set them to None pending = [(safe_utf8(prefix), None, None, None, safe_utf8(top))] while pending: relroot, _, _, _, top = pending.pop() if relroot: relprefix = relroot + '/' else: relprefix = '' top_slash = top + '/' dirblock = [] append = dirblock.append for name in sorted(_listdir(top)): abspath = top_slash + name statvalue = _lstat(abspath) kind = _kind_from_mode(statvalue.st_mode & 0170000, 'unknown') append((relprefix + name, name, kind, statvalue, abspath)) yield (relroot, top), dirblock # push the user specified dirs from dirblock pending.extend(d for d in reversed(dirblock) if d[2] == _directory) def _walkdirs_unicode_to_utf8(top, prefix=""): """See _walkdirs_utf8 Because Win32 has a Unicode api, all of the 'path-from-top' entries will be Unicode paths. This is currently the fallback code path when the filesystem encoding is not UTF-8. It may be better to implement an alternative so that we can safely handle paths that are not properly decodable in the current encoding. """ _utf8_encode = codecs.getencoder('utf8') _lstat = os.lstat _directory = _directory_kind _listdir = os.listdir _kind_from_mode = _formats.get pending = [(safe_utf8(prefix), None, None, None, safe_unicode(top))] while pending: relroot, _, _, _, top = pending.pop() if relroot: relprefix = relroot + '/' else: relprefix = '' top_slash = top + u'/' dirblock = [] append = dirblock.append for name in sorted(_listdir(top)): name_utf8 = _utf8_encode(name)[0] abspath = top_slash + name statvalue = _lstat(abspath) kind = _kind_from_mode(statvalue.st_mode & 0170000, 'unknown') append((relprefix + name_utf8, name_utf8, kind, statvalue, abspath)) yield (relroot, top), dirblock # push the user specified dirs from dirblock pending.extend(d for d in reversed(dirblock) if d[2] == _directory) def copy_tree(from_path, to_path, handlers={}): """Copy all of the entries in from_path into to_path. :param from_path: The base directory to copy. :param to_path: The target directory. If it does not exist, it will be created. :param handlers: A dictionary of functions, which takes a source and destinations for files, directories, etc. It is keyed on the file kind, such as 'directory', 'symlink', or 'file' 'file', 'directory', and 'symlink' should always exist. If they are missing, they will be replaced with 'os.mkdir()', 'os.readlink() + os.symlink()', and 'shutil.copy2()', respectively. """ # Now, just copy the existing cached tree to the new location # We use a cheap trick here. # Absolute paths are prefixed with the first parameter # relative paths are prefixed with the second. # So we can get both the source and target returned # without any extra work. def copy_dir(source, dest): os.mkdir(dest) def copy_link(source, dest): """Copy the contents of a symlink""" link_to = os.readlink(source) os.symlink(link_to, dest) real_handlers = {'file':shutil.copy2, 'symlink':copy_link, 'directory':copy_dir, } real_handlers.update(handlers) if not os.path.exists(to_path): real_handlers['directory'](from_path, to_path) for dir_info, entries in walkdirs(from_path, prefix=to_path): for relpath, name, kind, st, abspath in entries: real_handlers[kind](abspath, relpath) def path_prefix_key(path): """Generate a prefix-order path key for path. This can be used to sort paths in the same way that walkdirs does. """ return (dirname(path) , path) def compare_paths_prefix_order(path_a, path_b): """Compare path_a and path_b to generate the same order walkdirs uses.""" key_a = path_prefix_key(path_a) key_b = path_prefix_key(path_b) return cmp(key_a, key_b) _cached_user_encoding = None def get_user_encoding(use_cache=True): """Find out what the preferred user encoding is. This is generally the encoding that is used for command line parameters and file contents. This may be different from the terminal encoding or the filesystem encoding. :param use_cache: Enable cache for detected encoding. (This parameter is turned on by default, and required only for selftesting) :return: A string defining the preferred user encoding """ global _cached_user_encoding if _cached_user_encoding is not None and use_cache: return _cached_user_encoding if sys.platform == 'darwin': # work around egregious python 2.4 bug sys.platform = 'posix' try: import locale finally: sys.platform = 'darwin' else: import locale try: user_encoding = locale.getpreferredencoding() except locale.Error, e: sys.stderr.write('bzr: warning: %s\n' ' Could not determine what text encoding to use.\n' ' This error usually means your Python interpreter\n' ' doesn\'t support the locale set by $LANG (%s)\n' " Continuing with ascii encoding.\n" % (e, os.environ.get('LANG'))) user_encoding = 'ascii' # Windows returns 'cp0' to indicate there is no code page. So we'll just # treat that as ASCII, and not support printing unicode characters to the # console. if user_encoding in (None, 'cp0'): user_encoding = 'ascii' else: # check encoding try: codecs.lookup(user_encoding) except LookupError: sys.stderr.write('bzr: warning:' ' unknown encoding %s.' ' Continuing with ascii encoding.\n' % user_encoding ) user_encoding = 'ascii' if use_cache: _cached_user_encoding = user_encoding return user_encoding def recv_all(socket, bytes): """Receive an exact number of bytes. Regular Socket.recv() may return less than the requested number of bytes, dependning on what's in the OS buffer. MSG_WAITALL is not available on all platforms, but this should work everywhere. This will return less than the requested amount if the remote end closes. This isn't optimized and is intended mostly for use in testing. """ b = '' while len(b) < bytes: new = socket.recv(bytes - len(b)) if new == '': break # eof b += new return b def send_all(socket, bytes): """Send all bytes on a socket. Regular socket.sendall() can give socket error 10053 on Windows. This implementation sends no more than 64k at a time, which avoids this problem. """ chunk_size = 2**16 for pos in xrange(0, len(bytes), chunk_size): socket.sendall(bytes[pos:pos+chunk_size]) def dereference_path(path): """Determine the real path to a file. All parent elements are dereferenced. But the file itself is not dereferenced. :param path: The original path. May be absolute or relative. :return: the real path *to* the file """ parent, base = os.path.split(path) # The pathjoin for '.' is a workaround for Python bug #1213894. # (initial path components aren't dereferenced) return pathjoin(realpath(pathjoin('.', parent)), base) def supports_mapi(): """Return True if we can use MAPI to launch a mail client.""" return sys.platform == "win32" def resource_string(package, resource_name): """Load a resource from a package and return it as a string. Note: Only packages that start with bzrlib are currently supported. This is designed to be a lightweight implementation of resource loading in a way which is API compatible with the same API from pkg_resources. See http://peak.telecommunity.com/DevCenter/PkgResources#basic-resource-access. If and when pkg_resources becomes a standard library, this routine can delegate to it. """ # Check package name is within bzrlib if package == "bzrlib": resource_relpath = resource_name elif package.startswith("bzrlib."): package = package[len("bzrlib."):].replace('.', os.sep) resource_relpath = pathjoin(package, resource_name) else: raise errors.BzrError('resource package %s not in bzrlib' % package) # Map the resource to a file and read its contents base = dirname(bzrlib.__file__) if getattr(sys, 'frozen', None): # bzr.exe base = abspath(pathjoin(base, '..', '..')) filename = pathjoin(base, resource_relpath) return open(filename, 'rU').read()