Mercurial > hg
view mercurial/posix.py @ 14859:dccecfaebdd2
ui: rename _is_trusted to _trusted
is and do are pointless, underbar separators are style violations
author | Matt Mackall <mpm@selenic.com> |
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date | Tue, 12 Jul 2011 16:36:22 -0500 |
parents | 38af0f514134 |
children | e2b5605501df |
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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 os, sys, errno, stat, getpass, pwd, grp, tempfile posixfile = open nulldev = '/dev/null' 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 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 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: os.symlink(".", name) os.unlink(name) return True except (OSError, AttributeError): 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 if sys.platform == 'darwin': import fcntl # only needed on darwin, missing on jython def realpath(path): ''' Returns the true, canonical file system path equivalent to the given path. Equivalent means, in this case, resulting in the same, unique file system link to the path. Every file system entry, whether a file, directory, hard link or symbolic link or special, will have a single path preferred by the system, but may allow multiple, differing path lookups to point to it. Most regular UNIX file systems only allow a file system entry to be looked up by its distinct path. Obviously, this does not apply to case insensitive file systems, whether case preserving or not. The most complex issue to deal with is file systems transparently reencoding the path, such as the non-standard Unicode normalisation required for HFS+ and HFSX. ''' # Constants copied from /usr/include/sys/fcntl.h F_GETPATH = 50 O_SYMLINK = 0x200000 try: fd = os.open(path, O_SYMLINK) except OSError, err: if err.errno == errno.ENOENT: return path raise try: return fcntl.fcntl(fd, F_GETPATH, '\0' * 1024).rstrip('\0') finally: os.close(fd) else: # Fallback to the likely inadequate Python builtin function. realpath = os.path.realpath def shellquote(s): if os.sys.platform == 'OpenVMS': return '"%s"' % 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.exists(executable): return executable return None if os.sep in command: return findexisting(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 def statfiles(files): 'Stat each file in files and yield stat or None if file does not exist.' lstat = os.lstat for nf in files: try: st = lstat(nf) 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, fcntl for dev in (sys.stderr, sys.stdout, sys.stdin): try: try: fd = dev.fileno() except AttributeError: continue if not os.isatty(fd): continue arri = fcntl.ioctl(fd, termios.TIOCGWINSZ, '\0' * 8) width = array.array('h', arri)[1] if width > 0: return width except ValueError: pass except IOError, e: if e[0] == errno.EINVAL: pass else: raise except ImportError: pass return 80