Mercurial > hg
view mercurial/posix.py @ 24004:8a5267cd5286
parsers: rewrite index_ancestors() in terms of index_commonancestorsheads()
The first 80% of index_ancestors() is identical to
index_commonancestorsheads(), so just call that function instead.
author | Martin von Zweigbergk <martinvonz@google.com> |
---|---|
date | Fri, 23 Jan 2015 14:09:49 -0800 |
parents | 5edb387158a1 |
children | d65ecb814fc0 |
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# posix.py - Posix utility function implementations for Mercurial # # Copyright 2005-2009 Matt Mackall <mpm@selenic.com> and others # # This software may be used and distributed according to the terms of the # GNU General Public License version 2 or any later version. from i18n import _ import encoding import os, sys, errno, stat, getpass, pwd, grp, socket, tempfile, unicodedata import fcntl, re posixfile = open normpath = os.path.normpath samestat = os.path.samestat oslink = os.link unlink = os.unlink rename = os.rename expandglobs = False umask = os.umask(0) os.umask(umask) def split(p): '''Same as posixpath.split, but faster >>> import posixpath >>> for f in ['/absolute/path/to/file', ... 'relative/path/to/file', ... 'file_alone', ... 'path/to/directory/', ... '/multiple/path//separators', ... '/file_at_root', ... '///multiple_leading_separators_at_root', ... '']: ... assert split(f) == posixpath.split(f), f ''' ht = p.rsplit('/', 1) if len(ht) == 1: return '', p nh = ht[0].rstrip('/') if nh: return nh, ht[1] return ht[0] + '/', ht[1] def openhardlinks(): '''return true if it is safe to hold open file handles to hardlinks''' return True def nlinks(name): '''return number of hardlinks for the given file''' return os.lstat(name).st_nlink def parsepatchoutput(output_line): """parses the output produced by patch and returns the filename""" pf = output_line[14:] if os.sys.platform == 'OpenVMS': if pf[0] == '`': pf = pf[1:-1] # Remove the quotes else: if pf.startswith("'") and pf.endswith("'") and " " in pf: pf = pf[1:-1] # Remove the quotes return pf def sshargs(sshcmd, host, user, port): '''Build argument list for ssh''' args = user and ("%s@%s" % (user, host)) or host return port and ("%s -p %s" % (args, port)) or args def isexec(f): """check whether a file is executable""" return (os.lstat(f).st_mode & 0100 != 0) def setflags(f, l, x): s = os.lstat(f).st_mode if l: if not stat.S_ISLNK(s): # switch file to link fp = open(f) data = fp.read() fp.close() os.unlink(f) try: os.symlink(data, f) except OSError: # failed to make a link, rewrite file fp = open(f, "w") fp.write(data) fp.close() # no chmod needed at this point return if stat.S_ISLNK(s): # switch link to file data = os.readlink(f) os.unlink(f) fp = open(f, "w") fp.write(data) fp.close() s = 0666 & ~umask # avoid restatting for chmod sx = s & 0100 if x and not sx: # Turn on +x for every +r bit when making a file executable # and obey umask. os.chmod(f, s | (s & 0444) >> 2 & ~umask) elif not x and sx: # Turn off all +x bits os.chmod(f, s & 0666) def copymode(src, dst, mode=None): '''Copy the file mode from the file at path src to dst. If src doesn't exist, we're using mode instead. If mode is None, we're using umask.''' try: st_mode = os.lstat(src).st_mode & 0777 except OSError, inst: if inst.errno != errno.ENOENT: raise st_mode = mode if st_mode is None: st_mode = ~umask st_mode &= 0666 os.chmod(dst, st_mode) def checkexec(path): """ Check whether the given path is on a filesystem with UNIX-like exec flags Requires a directory (like /foo/.hg) """ # VFAT on some Linux versions can flip mode but it doesn't persist # a FS remount. Frequently we can detect it if files are created # with exec bit on. try: EXECFLAGS = stat.S_IXUSR | stat.S_IXGRP | stat.S_IXOTH fh, fn = tempfile.mkstemp(dir=path, prefix='hg-checkexec-') try: os.close(fh) m = os.stat(fn).st_mode & 0777 new_file_has_exec = m & EXECFLAGS os.chmod(fn, m ^ EXECFLAGS) exec_flags_cannot_flip = ((os.stat(fn).st_mode & 0777) == m) finally: os.unlink(fn) except (IOError, OSError): # we don't care, the user probably won't be able to commit anyway return False return not (new_file_has_exec or exec_flags_cannot_flip) def checklink(path): """check whether the given path is on a symlink-capable filesystem""" # mktemp is not racy because symlink creation will fail if the # file already exists name = tempfile.mktemp(dir=path, prefix='hg-checklink-') try: fd = tempfile.NamedTemporaryFile(dir=path, prefix='hg-checklink-') try: os.symlink(os.path.basename(fd.name), name) os.unlink(name) return True finally: fd.close() except AttributeError: return False except OSError, inst: # sshfs might report failure while successfully creating the link if inst[0] == errno.EIO and os.path.exists(name): os.unlink(name) return False def checkosfilename(path): '''Check that the base-relative path is a valid filename on this platform. Returns None if the path is ok, or a UI string describing the problem.''' pass # on posix platforms, every path is ok def setbinary(fd): pass def pconvert(path): return path def localpath(path): return path def samefile(fpath1, fpath2): """Returns whether path1 and path2 refer to the same file. This is only guaranteed to work for files, not directories.""" return os.path.samefile(fpath1, fpath2) def samedevice(fpath1, fpath2): """Returns whether fpath1 and fpath2 are on the same device. This is only guaranteed to work for files, not directories.""" st1 = os.lstat(fpath1) st2 = os.lstat(fpath2) return st1.st_dev == st2.st_dev # os.path.normcase is a no-op, which doesn't help us on non-native filesystems def normcase(path): return path.lower() if sys.platform == 'darwin': def normcase(path): ''' Normalize a filename for OS X-compatible comparison: - escape-encode invalid characters - decompose to NFD - lowercase - omit ignored characters [200c-200f, 202a-202e, 206a-206f,feff] >>> normcase('UPPER') 'upper' >>> normcase('Caf\xc3\xa9') 'cafe\\xcc\\x81' >>> normcase('\xc3\x89') 'e\\xcc\\x81' >>> normcase('\xb8\xca\xc3\xca\xbe\xc8.JPG') # issue3918 '%b8%ca%c3\\xca\\xbe%c8.jpg' ''' try: return encoding.asciilower(path) # exception for non-ASCII except UnicodeDecodeError: pass try: u = path.decode('utf-8') except UnicodeDecodeError: # OS X percent-encodes any bytes that aren't valid utf-8 s = '' g = '' l = 0 for c in path: o = ord(c) if l and o < 128 or o >= 192: # we want a continuation byte, but didn't get one s += ''.join(["%%%02X" % ord(x) for x in g]) g = '' l = 0 if l == 0 and o < 128: # ascii s += c elif l == 0 and 194 <= o < 245: # valid leading bytes if o < 224: l = 1 elif o < 240: l = 2 else: l = 3 g = c elif l > 0 and 128 <= o < 192: # valid continuations g += c l -= 1 if not l: s += g g = '' else: # invalid s += "%%%02X" % o # any remaining partial characters s += ''.join(["%%%02X" % ord(x) for x in g]) u = s.decode('utf-8') # Decompose then lowercase (HFS+ technote specifies lower) enc = unicodedata.normalize('NFD', u).lower().encode('utf-8') # drop HFS+ ignored characters return encoding.hfsignoreclean(enc) if sys.platform == 'cygwin': # workaround for cygwin, in which mount point part of path is # treated as case sensitive, even though underlying NTFS is case # insensitive. # default mount points cygwinmountpoints = sorted([ "/usr/bin", "/usr/lib", "/cygdrive", ], reverse=True) # use upper-ing as normcase as same as NTFS workaround def normcase(path): pathlen = len(path) if (pathlen == 0) or (path[0] != os.sep): # treat as relative return encoding.upper(path) # to preserve case of mountpoint part for mp in cygwinmountpoints: if not path.startswith(mp): continue mplen = len(mp) if mplen == pathlen: # mount point itself return mp if path[mplen] == os.sep: return mp + encoding.upper(path[mplen:]) return encoding.upper(path) # Cygwin translates native ACLs to POSIX permissions, # but these translations are not supported by native # tools, so the exec bit tends to be set erroneously. # Therefore, disable executable bit access on Cygwin. def checkexec(path): return False # Similarly, Cygwin's symlink emulation is likely to create # problems when Mercurial is used from both Cygwin and native # Windows, with other native tools, or on shared volumes def checklink(path): return False _needsshellquote = None def shellquote(s): if os.sys.platform == 'OpenVMS': return '"%s"' % s global _needsshellquote if _needsshellquote is None: _needsshellquote = re.compile(r'[^a-zA-Z0-9._/-]').search if not _needsshellquote(s): # "s" shouldn't have to be quoted return s else: return "'%s'" % s.replace("'", "'\\''") def quotecommand(cmd): return cmd def popen(command, mode='r'): return os.popen(command, mode) def testpid(pid): '''return False if pid dead, True if running or not sure''' if os.sys.platform == 'OpenVMS': return True try: os.kill(pid, 0) return True except OSError, inst: return inst.errno != errno.ESRCH def explainexit(code): """return a 2-tuple (desc, code) describing a subprocess status (codes from kill are negative - not os.system/wait encoding)""" if code >= 0: return _("exited with status %d") % code, code return _("killed by signal %d") % -code, -code def isowner(st): """Return True if the stat object st is from the current user.""" return st.st_uid == os.getuid() def findexe(command): '''Find executable for command searching like which does. If command is a basename then PATH is searched for command. PATH isn't searched if command is an absolute or relative path. If command isn't found None is returned.''' if sys.platform == 'OpenVMS': return command def findexisting(executable): 'Will return executable if existing file' if os.path.isfile(executable) and os.access(executable, os.X_OK): return executable return None if os.sep in command: return findexisting(command) if sys.platform == 'plan9': return findexisting(os.path.join('/bin', command)) for path in os.environ.get('PATH', '').split(os.pathsep): executable = findexisting(os.path.join(path, command)) if executable is not None: return executable return None def setsignalhandler(): pass _wantedkinds = set([stat.S_IFREG, stat.S_IFLNK]) def statfiles(files): '''Stat each file in files. Yield each stat, or None if a file does not exist or has a type we don't care about.''' lstat = os.lstat getkind = stat.S_IFMT for nf in files: try: st = lstat(nf) if getkind(st.st_mode) not in _wantedkinds: st = None except OSError, err: if err.errno not in (errno.ENOENT, errno.ENOTDIR): raise st = None yield st def getuser(): '''return name of current user''' return getpass.getuser() def username(uid=None): """Return the name of the user with the given uid. If uid is None, return the name of the current user.""" if uid is None: uid = os.getuid() try: return pwd.getpwuid(uid)[0] except KeyError: return str(uid) def groupname(gid=None): """Return the name of the group with the given gid. If gid is None, return the name of the current group.""" if gid is None: gid = os.getgid() try: return grp.getgrgid(gid)[0] except KeyError: return str(gid) def groupmembers(name): """Return the list of members of the group with the given name, KeyError if the group does not exist. """ return list(grp.getgrnam(name).gr_mem) def spawndetached(args): return os.spawnvp(os.P_NOWAIT | getattr(os, 'P_DETACH', 0), args[0], args) def gethgcmd(): return sys.argv[:1] def termwidth(): try: import termios, array for dev in (sys.stderr, sys.stdout, sys.stdin): try: try: fd = dev.fileno() except AttributeError: continue if not os.isatty(fd): continue try: arri = fcntl.ioctl(fd, termios.TIOCGWINSZ, '\0' * 8) width = array.array('h', arri)[1] if width > 0: return width except AttributeError: pass except ValueError: pass except IOError, e: if e[0] == errno.EINVAL: pass else: raise except ImportError: pass return 80 def makedir(path, notindexed): os.mkdir(path) def unlinkpath(f, ignoremissing=False): """unlink and remove the directory if it is empty""" try: os.unlink(f) except OSError, e: if not (ignoremissing and e.errno == errno.ENOENT): raise # try removing directories that might now be empty try: os.removedirs(os.path.dirname(f)) except OSError: pass def lookupreg(key, name=None, scope=None): return None def hidewindow(): """Hide current shell window. Used to hide the window opened when starting asynchronous child process under Windows, unneeded on other systems. """ pass class cachestat(object): def __init__(self, path): self.stat = os.stat(path) def cacheable(self): return bool(self.stat.st_ino) __hash__ = object.__hash__ def __eq__(self, other): try: # Only dev, ino, size, mtime and atime are likely to change. Out # of these, we shouldn't compare atime but should compare the # rest. However, one of the other fields changing indicates # something fishy going on, so return False if anything but atime # changes. return (self.stat.st_mode == other.stat.st_mode and self.stat.st_ino == other.stat.st_ino and self.stat.st_dev == other.stat.st_dev and self.stat.st_nlink == other.stat.st_nlink and self.stat.st_uid == other.stat.st_uid and self.stat.st_gid == other.stat.st_gid and self.stat.st_size == other.stat.st_size and self.stat.st_mtime == other.stat.st_mtime and self.stat.st_ctime == other.stat.st_ctime) except AttributeError: return False def __ne__(self, other): return not self == other def executablepath(): return None # available on Windows only class unixdomainserver(socket.socket): def __init__(self, join, subsystem): '''Create a unix domain socket with the given prefix.''' super(unixdomainserver, self).__init__(socket.AF_UNIX) sockname = subsystem + '.sock' self.realpath = self.path = join(sockname) if os.path.islink(self.path): if os.path.exists(self.path): self.realpath = os.readlink(self.path) else: os.unlink(self.path) try: self.bind(self.realpath) except socket.error, err: if err.args[0] == 'AF_UNIX path too long': tmpdir = tempfile.mkdtemp(prefix='hg-%s-' % subsystem) self.realpath = os.path.join(tmpdir, sockname) try: self.bind(self.realpath) os.symlink(self.realpath, self.path) except (OSError, socket.error): self.cleanup() raise else: raise self.listen(5) def cleanup(self): def okayifmissing(f, path): try: f(path) except OSError, err: if err.errno != errno.ENOENT: raise okayifmissing(os.unlink, self.path) if self.realpath != self.path: okayifmissing(os.unlink, self.realpath) okayifmissing(os.rmdir, os.path.dirname(self.realpath)) def statislink(st): '''check whether a stat result is a symlink''' return st and stat.S_ISLNK(st.st_mode) def statisexec(st): '''check whether a stat result is an executable file''' return st and (st.st_mode & 0100 != 0) def readpipe(pipe): """Read all available data from a pipe.""" # We can't fstat() a pipe because Linux will always report 0. # So, we set the pipe to non-blocking mode and read everything # that's available. flags = fcntl.fcntl(pipe, fcntl.F_GETFL) flags |= os.O_NONBLOCK oldflags = fcntl.fcntl(pipe, fcntl.F_SETFL, flags) try: chunks = [] while True: try: s = pipe.read() if not s: break chunks.append(s) except IOError: break return ''.join(chunks) finally: fcntl.fcntl(pipe, fcntl.F_SETFL, oldflags)