Python os.access函数代码示例

def xtermTitleReset():
	global default_xterm_title
	if default_xterm_title is None:
		prompt_command = os.environ.get('PROMPT_COMMAND')
		if prompt_command == "":
			default_xterm_title = ""
		elif prompt_command is not None:
			if dotitles and \
				'TERM' in os.environ and \
				_legal_terms_re.match(os.environ['TERM']) is not None and \
				sys.__stderr__.isatty():
				from portage.process import find_binary, spawn
				shell = os.environ.get("SHELL")
				if not shell or not os.access(shell, os.EX_OK):
					shell = find_binary("sh")
				if shell:
					spawn([shell, "-c", prompt_command], env=os.environ,
						fd_pipes={
							0: portage._get_stdin().fileno(),
							1: sys.__stderr__.fileno(),
							2: sys.__stderr__.fileno()
						})
				else:
					os.system(prompt_command)
			return
		else:
			pwd = os.environ.get('PWD','')
			home = os.environ.get('HOME', '')
			if home != '' and pwd.startswith(home):
				pwd = '~' + pwd[len(home):]
			default_xterm_title = '\x1b]0;%[email protected]%s:%s\x07' % (
				os.environ.get('LOGNAME', ''),
				os.environ.get('HOSTNAME', '').split('.', 1)[0], pwd)
	xtermTitle(default_xterm_title, raw=True)

	def _check_world(self, onProgress):
		eroot = portage.settings['EROOT']
		self.world_file = os.path.join(eroot, portage.const.WORLD_FILE)
		self.found = os.access(self.world_file, os.R_OK)
		vardb = portage.db[eroot]["vartree"].dbapi

		from portage._sets import SETPREFIX
		sets = self._sets
		world_atoms = list(sets["selected"])
		maxval = len(world_atoms)
		if onProgress:
			onProgress(maxval, 0)
		for i, atom in enumerate(world_atoms):
			if not isinstance(atom, portage.dep.Atom):
				if atom.startswith(SETPREFIX):
					s = atom[len(SETPREFIX):]
					if s in sets:
						self.okay.append(atom)
					else:
						self.not_installed.append(atom)
				else:
					self.invalid.append(atom)
				if onProgress:
					onProgress(maxval, i+1)
				continue
			okay = True
			if not vardb.match(atom):
				self.not_installed.append(atom)
				okay = False
			if okay:
				self.okay.append(atom)
			if onProgress:
				onProgress(maxval, i+1)

	def sync(self, acquire_lock=1):
		"""
		Call this method to synchronize state with the real vardb
		after one or more packages may have been installed or
		uninstalled.
		"""
		vdb_path = os.path.join(self.root, portage.VDB_PATH)
		try:
			# At least the parent needs to exist for the lock file.
			portage.util.ensure_dirs(vdb_path)
		except portage.exception.PortageException:
			pass
		vdb_lock = None
		try:
			if acquire_lock and os.access(vdb_path, os.W_OK):
				vdb_lock = portage.locks.lockdir(vdb_path)
			self._sync()
		finally:
			if vdb_lock:
				portage.locks.unlockdir(vdb_lock)

		# Populate the old-style virtuals using the cached values.
		# Skip the aux_get wrapper here, to avoid unwanted
		# cache generation.
		try:
			self.dbapi.aux_get = self._aux_get
			self.settings._populate_treeVirtuals_if_needed(self)
		finally:
			self.dbapi.aux_get = self._aux_get_wrapper

	def sync(self, acquire_lock=1):
		"""
		Call this method to synchronize state with the real vardb
		after one or more packages may have been installed or
		uninstalled.
		"""
		locked = False
		try:
			if acquire_lock and os.access(self._real_vardb._dbroot, os.W_OK):
				self._real_vardb.lock()
				locked = True
			self._sync()
		finally:
			if locked:
				self._real_vardb.unlock()

		# Populate the old-style virtuals using the cached values.
		# Skip the aux_get wrapper here, to avoid unwanted
		# cache generation.
		try:
			self.dbapi.aux_get = self._aux_get
			self.settings._populate_treeVirtuals_if_needed(self)
		finally:
			if self._dynamic_deps:
				self.dbapi.aux_get = self._aux_get_wrapper

def get_glsa_list(myconfig):
	"""
	Returns a list of all available GLSAs in the given repository
	by comparing the filelist there with the pattern described in
	the config.

	@type	myconfig: portage.config
	@param	myconfig: Portage settings instance

	@rtype:		List of Strings
	@return:	a list of GLSA IDs in this repository
	"""
	rValue = []

	if "GLSA_DIR" in myconfig:
		repository = myconfig["GLSA_DIR"]
	else:
		repository = os.path.join(myconfig["PORTDIR"], "metadata", "glsa")

	if not os.access(repository, os.R_OK):
		return []
	dirlist = os.listdir(repository)
	prefix = "glsa-"
	suffix = ".xml"

	for f in dirlist:
		try:
			if f[:len(prefix)] == prefix and f[-1*len(suffix):] == suffix:
				rValue.append(f[len(prefix):-1*len(suffix)])
		except IndexError:
			pass
	return rValue

def deprecated_profile_check(settings=None):
	config_root = "/"
	if settings is not None:
		config_root = settings["PORTAGE_CONFIGROOT"]
	deprecated_profile_file = os.path.join(config_root,
		DEPRECATED_PROFILE_FILE)
	if not os.access(deprecated_profile_file, os.R_OK):
		return False
	dcontent = codecs.open(_unicode_encode(deprecated_profile_file,
		encoding=_encodings['fs'], errors='strict'), 
		mode='r', encoding=_encodings['content'], errors='replace').readlines()
	writemsg(colorize("BAD", _("\n!!! Your current profile is "
		"deprecated and not supported anymore.")) + "\n", noiselevel=-1)
	writemsg(colorize("BAD", _("!!! Use eselect profile to update your "
		"profile.")) + "\n", noiselevel=-1)
	if not dcontent:
		writemsg(colorize("BAD", _("!!! Please refer to the "
			"Gentoo Upgrading Guide.")) + "\n", noiselevel=-1)
		return True
	newprofile = dcontent[0]
	writemsg(colorize("BAD", _("!!! Please upgrade to the "
		"following profile if possible:")) + "\n", noiselevel=-1)
	writemsg(8*" " + colorize("GOOD", newprofile) + "\n", noiselevel=-1)
	if len(dcontent) > 1:
		writemsg(_("To upgrade do the following steps:\n"), noiselevel=-1)
		for myline in dcontent[1:]:
			writemsg(myline, noiselevel=-1)
		writemsg("\n\n", noiselevel=-1)
	return True

	def populate(self, getbinpkgs=False, getbinpkg_refresh=True):
		"""
		Populates the binarytree with package metadata.

		@param getbinpkgs: include remote packages
		@type getbinpkgs: bool
		@param getbinpkg_refresh: attempt to refresh the cache
			of remote package metadata if getbinpkgs is also True
		@type getbinpkg_refresh: bool
		"""

		if self._populating:
			return

		pkgindex_lock = None
		try:
			if os.access(self.pkgdir, os.W_OK):
				pkgindex_lock = lockfile(self._pkgindex_file,
					wantnewlockfile=1)
			self._populating = True
			self._populate(getbinpkgs, getbinpkg_refresh=getbinpkg_refresh)
		finally:
			if pkgindex_lock:
				unlockfile(pkgindex_lock)
			self._populating = False

def binTestsCleanup():
	global basedir
	if basedir is None:
		return
	if os.access(basedir, os.W_OK):
		shutil.rmtree(basedir)
		basedir = None

	def findLicensePath(self, license_name):
		mytrees = self.porttrees[:]
		mytrees.reverse()
		for x in mytrees:
			license_path = os.path.join(x, "licenses", license_name)
			if os.access(license_path, os.R_OK):
				return license_path
		return None

	def writable(self):
		"""
		Check if self.location is writable, or permissions are sufficient
		to create it if it does not exist yet.
		@rtype: bool
		@return: True if self.location is writable or can be created,
			False otherwise
		"""
		return os.access(first_existing(self.location), os.W_OK)

    def isInjected(self):
        """
		Looks if the GLSA ID is in the GLSA checkfile to check if this
		GLSA should be marked as applied.

		@rtype:		Boolean
		@returns:	True if the GLSA is in the inject file, False if not
		"""
        if not os.access(os.path.join(self.config["EROOT"], PRIVATE_PATH, "glsa_injected"), os.R_OK):
            return False
        return self.nr in get_applied_glsas(self.config)

def find_updated_config_files(target_root, config_protect):
	"""
	Return a tuple of configuration files that needs to be updated.
	The tuple contains lists organized like this:
	[ protected_dir, file_list ]
	If the protected config isn't a protected_dir but a procted_file, list is:
	[ protected_file, None ]
	If no configuration files needs to be updated, None is returned
	"""

	os = _os_merge

	if config_protect:
		# directories with some protect files in them
		for x in config_protect:
			files = []

			x = os.path.join(target_root, x.lstrip(os.path.sep))
			if not os.access(x, os.W_OK):
				continue
			try:
				mymode = os.lstat(x).st_mode
			except OSError:
				continue

			if stat.S_ISLNK(mymode):
				# We want to treat it like a directory if it
				# is a symlink to an existing directory.
				try:
					real_mode = os.stat(x).st_mode
					if stat.S_ISDIR(real_mode):
						mymode = real_mode
				except OSError:
					pass

			if stat.S_ISDIR(mymode):
				mycommand = \
					"find '%s' -name '.*' -type d -prune -o -name '._cfg????_*'" % x
			else:
				mycommand = "find '%s' -maxdepth 1 -name '._cfg????_%s'" % \
						os.path.split(x.rstrip(os.path.sep))
			mycommand += " ! -name '.*~' ! -iname '.*.bak' -print0"
			a = subprocess_getstatusoutput(mycommand)

			if a[0] == 0:
				files = a[1].split('\0')
				# split always produces an empty string as the last element
				if files and not files[-1]:
					del files[-1]
				if files:
					if stat.S_ISDIR(mymode):
						yield (x, files)
					else:
						yield (x, None)

	def prevent_collision(self, cpv):
		"""Make sure that the file location ${PKGDIR}/All/${PF}.tbz2 is safe to
		use for a given cpv.  If a collision will occur with an existing
		package from another category, the existing package will be bumped to
		${PKGDIR}/${CATEGORY}/${PF}.tbz2 so that both can coexist."""
		if not self._all_directory:
			return

		# Copy group permissions for new directories that
		# may have been created.
		for path in ("All", catsplit(cpv)[0]):
			path = os.path.join(self.pkgdir, path)
			self._ensure_dir(path)
			if not os.access(path, os.W_OK):
				raise PermissionDenied("access('%s', W_OK)" % path)

		full_path = self.getname(cpv)
		if "All" == full_path.split(os.path.sep)[-2]:
			return
		"""Move a colliding package if it exists.  Code below this point only
		executes in rare cases."""
		mycat, mypkg = catsplit(cpv)
		myfile = mypkg + ".tbz2"
		mypath = os.path.join("All", myfile)
		dest_path = os.path.join(self.pkgdir, mypath)

		try:
			st = os.lstat(dest_path)
		except OSError:
			st = None
		else:
			if stat.S_ISLNK(st.st_mode):
				st = None
				try:
					os.unlink(dest_path)
				except OSError:
					if os.path.exists(dest_path):
						raise

		if st is not None:
			# For invalid packages, other_cat could be None.
			other_cat = portage.xpak.tbz2(dest_path).getfile(
				_unicode_encode("CATEGORY",
				encoding=_encodings['repo.content']))
			if other_cat:
				other_cat = _unicode_decode(other_cat,
					encoding=_encodings['repo.content'], errors='replace')
				other_cat = other_cat.strip()
				other_cpv = other_cat + "/" + mypkg
				self._move_from_all(other_cpv)
				self.inject(other_cpv)
		self._move_to_all(cpv)

def gpgsign(filename, repoman_settings, options):
	gpgcmd = repoman_settings.get("PORTAGE_GPG_SIGNING_COMMAND")
	if gpgcmd in [None, '']:
		raise MissingParameter("PORTAGE_GPG_SIGNING_COMMAND is unset!"
			" Is make.globals missing?")
	if "${PORTAGE_GPG_KEY}" in gpgcmd and \
		"PORTAGE_GPG_KEY" not in repoman_settings:
		raise MissingParameter("PORTAGE_GPG_KEY is unset!")
	if "${PORTAGE_GPG_DIR}" in gpgcmd:
		if "PORTAGE_GPG_DIR" not in repoman_settings:
			repoman_settings["PORTAGE_GPG_DIR"] = \
				os.path.expanduser("~/.gnupg")
			logging.info(
				"Automatically setting PORTAGE_GPG_DIR to '%s'" %
				repoman_settings["PORTAGE_GPG_DIR"])
		else:
			repoman_settings["PORTAGE_GPG_DIR"] = \
				os.path.expanduser(repoman_settings["PORTAGE_GPG_DIR"])
		if not os.access(repoman_settings["PORTAGE_GPG_DIR"], os.X_OK):
			raise portage.exception.InvalidLocation(
				"Unable to access directory: PORTAGE_GPG_DIR='%s'" %
				repoman_settings["PORTAGE_GPG_DIR"])
	gpgvars = {"FILE": filename}
	for k in ("PORTAGE_GPG_DIR", "PORTAGE_GPG_KEY"):
		v = repoman_settings.get(k)
		if v is not None:
			gpgvars[k] = v
	gpgcmd = portage.util.varexpand(gpgcmd, mydict=gpgvars)
	if options.pretend:
		print("(" + gpgcmd + ")")
	else:
		# Encode unicode manually for bug #310789.
		gpgcmd = portage.util.shlex_split(gpgcmd)

		if sys.hexversion < 0x3020000 and sys.hexversion >= 0x3000000 and \
			not os.path.isabs(gpgcmd[0]):
			# Python 3.1 _execvp throws TypeError for non-absolute executable
			# path passed as bytes (see http://bugs.python.org/issue8513).
			fullname = find_binary(gpgcmd[0])
			if fullname is None:
				raise portage.exception.CommandNotFound(gpgcmd[0])
			gpgcmd[0] = fullname

		gpgcmd = [
			_unicode_encode(arg, encoding=_encodings['fs'], errors='strict')
			for arg in gpgcmd]
		rValue = subprocess.call(gpgcmd)
		if rValue == os.EX_OK:
			os.rename(filename + ".asc", filename)
		else:
			raise portage.exception.PortageException(
				"!!! gpg exited with '" + str(rValue) + "' status")

	def _start(self):
		settings = self.settings
		if settings is None:
			settings = self.portdb.settings

		if 'PORTAGE_PARALLEL_FETCHONLY' in settings:
			# parallel-fetch mode
			self.returncode = os.EX_OK
			self._async_wait()
			return

		# Prevent temporary config changes from interfering
		# with config instances that are reused.
		settings = self.settings = config(clone=settings)

		# We must create our private PORTAGE_TMPDIR before calling
		# doebuild_environment(), since lots of variables such
		# as PORTAGE_BUILDDIR refer to paths inside PORTAGE_TMPDIR.
		portage_tmpdir = settings.get('PORTAGE_TMPDIR')
		if not portage_tmpdir or not os.access(portage_tmpdir, os.W_OK):
			portage_tmpdir = None
		private_tmpdir = self._private_tmpdir = tempfile.mkdtemp(
			dir=portage_tmpdir)
		settings['PORTAGE_TMPDIR'] = private_tmpdir
		settings.backup_changes('PORTAGE_TMPDIR')
		# private temp dir was just created, so it's not locked yet
		settings.pop('PORTAGE_BUILDDIR_LOCKED', None)

		doebuild_environment(self.ebuild_path, 'nofetch',
			settings=settings, db=self.portdb)
		restrict = settings['PORTAGE_RESTRICT'].split()
		defined_phases = settings['DEFINED_PHASES'].split()
		if not defined_phases:
			# When DEFINED_PHASES is undefined, assume all
			# phases are defined.
			defined_phases = EBUILD_PHASES

		if 'fetch' not in restrict and \
			'nofetch' not in defined_phases:
			self.returncode = os.EX_OK
			self._async_wait()
			return

		prepare_build_dirs(settings=settings)

		ebuild_phase = EbuildPhase(background=self.background,
			phase='nofetch',
			scheduler=self.scheduler,
			fd_pipes=self.fd_pipes, settings=settings)

		self._start_task(ebuild_phase, self._nofetch_exit)