Python EbuildBuildDir.EbuildBuildDir类代码示例

	def _start(self):

		vardb = self.pkg.root_config.trees["vartree"].dbapi
		dbdir = vardb.getpath(self.pkg.cpv)
		if not os.path.exists(dbdir):
			# Apparently the package got uninstalled
			# already, so we can safely return early.
			self.returncode = os.EX_OK
			self._async_wait()
			return

		self.settings.setcpv(self.pkg)
		cat, pf = portage.catsplit(self.pkg.cpv)
		myebuildpath = os.path.join(dbdir, pf + ".ebuild")

		try:
			portage.doebuild_environment(myebuildpath, "prerm",
				settings=self.settings, db=vardb)
		except UnsupportedAPIException:
			# This is safe to ignore since this function is
			# guaranteed to set PORTAGE_BUILDDIR even though
			# it raises UnsupportedAPIException. The error
			# will be logged when it prevents the pkg_prerm
			# and pkg_postrm phases from executing.
			pass

		self._builddir_lock = EbuildBuildDir(
			scheduler=self.scheduler, settings=self.settings)
		self._start_task(
			AsyncTaskFuture(future=self._builddir_lock.async_lock()),
			self._start_unmerge)

	def _prefetch_exit(self, prefetcher):

		opts = self.opts
		pkg = self.pkg
		settings = self.settings

		if opts.fetchonly:
				fetcher = EbuildFetchonly(
					fetch_all=opts.fetch_all_uri,
					pkg=pkg, pretend=opts.pretend,
					settings=settings)
				retval = fetcher.execute()
				self.returncode = retval
				self.wait()
				return

		self._build_dir = EbuildBuildDir(pkg=pkg, settings=settings)
		self._build_dir.lock()

		# Cleaning needs to happen before fetch, since the build dir
		# is used for log handling.
		msg = " === (%s of %s) Cleaning (%s::%s)" % \
			(self.pkg_count.curval, self.pkg_count.maxval,
			self.pkg.cpv, self._ebuild_path)
		short_msg = "emerge: (%s of %s) %s Clean" % \
			(self.pkg_count.curval, self.pkg_count.maxval, self.pkg.cpv)
		self.logger.log(msg, short_msg=short_msg)

		pre_clean_phase = EbuildPhase(background=self.background,
			phase='clean', scheduler=self.scheduler, settings=self.settings)
		self._start_task(pre_clean_phase, self._pre_clean_exit)

	def _start(self):

		vardb = self.pkg.root_config.trees["vartree"].dbapi
		dbdir = vardb.getpath(self.pkg.cpv)
		if not os.path.exists(dbdir):
			# Apparently the package got uninstalled
			# already, so we can safely return early.
			self.returncode = os.EX_OK
			self._async_wait()
			return

		self.settings.setcpv(self.pkg)
		cat, pf = portage.catsplit(self.pkg.cpv)
		myebuildpath = os.path.join(dbdir, pf + ".ebuild")

		try:
			portage.doebuild_environment(myebuildpath, "prerm",
				settings=self.settings, db=vardb)
		except UnsupportedAPIException:
			# This is safe to ignore since this function is
			# guaranteed to set PORTAGE_BUILDDIR even though
			# it raises UnsupportedAPIException. The error
			# will be logged when it prevents the pkg_prerm
			# and pkg_postrm phases from executing.
			pass

		self._builddir_lock = EbuildBuildDir(
			scheduler=self.scheduler, settings=self.settings)
		self._builddir_lock.lock()

		portage.prepare_build_dirs(
			settings=self.settings, cleanup=True)

		# Output only gets logged if it comes after prepare_build_dirs()
		# which initializes PORTAGE_LOG_FILE.
		retval, pkgmap = _unmerge_display(self.pkg.root_config,
			self.opts, "unmerge", [self.pkg.cpv], clean_delay=0,
			writemsg_level=self._writemsg_level)

		if retval != os.EX_OK:
			self._builddir_lock.unlock()
			self.returncode = retval
			self._async_wait()
			return

		self._writemsg_level(">>> Unmerging %s...\n" % (self.pkg.cpv,),
			noiselevel=-1)
		self._emergelog("=== Unmerging... (%s)" % (self.pkg.cpv,))

		unmerge_task = MergeProcess(
			mycat=cat, mypkg=pf, settings=self.settings,
			treetype="vartree", vartree=self.pkg.root_config.trees["vartree"],
			scheduler=self.scheduler, background=self.background,
			mydbapi=self.pkg.root_config.trees["vartree"].dbapi,
			prev_mtimes=self.ldpath_mtimes,
			logfile=self.settings.get("PORTAGE_LOG_FILE"), unmerge=True)

		self._start_task(unmerge_task, self._unmerge_exit)

	def _start(self):

		pkg = self.pkg
		settings = self.settings
		settings.setcpv(pkg)
		self._tree = "bintree"
		self._bintree = self.pkg.root_config.trees[self._tree]
		self._verify = not self.opts.pretend

		dir_path = os.path.join(settings["PORTAGE_TMPDIR"],
			"portage", pkg.category, pkg.pf)
		self._build_dir = EbuildBuildDir(dir_path=dir_path,
			pkg=pkg, settings=settings)
		self._image_dir = os.path.join(dir_path, "image")
		self._infloc = os.path.join(dir_path, "build-info")
		self._ebuild_path = os.path.join(self._infloc, pkg.pf + ".ebuild")
		settings["EBUILD"] = self._ebuild_path
		debug = settings.get("PORTAGE_DEBUG") == "1"
		portage.doebuild_environment(self._ebuild_path, "setup",
			settings["ROOT"], settings, debug, 1, self._bintree.dbapi)
		settings.configdict["pkg"]["EMERGE_FROM"] = pkg.type_name

		# The prefetcher has already completed or it
		# could be running now. If it's running now,
		# wait for it to complete since it holds
		# a lock on the file being fetched. The
		# portage.locks functions are only designed
		# to work between separate processes. Since
		# the lock is held by the current process,
		# use the scheduler and fetcher methods to
		# synchronize with the fetcher.
		prefetcher = self.prefetcher
		if prefetcher is None:
			pass
		elif not prefetcher.isAlive():
			prefetcher.cancel()
		elif prefetcher.poll() is None:

			waiting_msg = ("Fetching '%s' " + \
				"in the background. " + \
				"To view fetch progress, run `tail -f " + \
				"/var/log/emerge-fetch.log` in another " + \
				"terminal.") % prefetcher.pkg_path
			msg_prefix = colorize("GOOD", " * ")
			from textwrap import wrap
			waiting_msg = "".join("%s%s\n" % (msg_prefix, line) \
				for line in wrap(waiting_msg, 65))
			if not self.background:
				writemsg(waiting_msg, noiselevel=-1)

			self._current_task = prefetcher
			prefetcher.addExitListener(self._prefetch_exit)
			return

		self._prefetch_exit(prefetcher)

	def _start(self):

		need_builddir = self.phase not in self._phases_without_builddir

		# This can happen if the pre-clean phase triggers
		# die_hooks for some reason, and PORTAGE_BUILDDIR
		# doesn't exist yet.
		if need_builddir and \
			not os.path.isdir(self.settings['PORTAGE_BUILDDIR']):
			msg = _("The ebuild phase '%s' has been aborted "
			"since PORTAGE_BUILDIR does not exist: '%s'") % \
			(self.phase, self.settings['PORTAGE_BUILDDIR'])
			self._eerror(textwrap.wrap(msg, 72))
			self._set_returncode((self.pid, 1 << 8))
			self.wait()
			return

		if self.background:
			# Automatically prevent color codes from showing up in logs,
			# since we're not displaying to a terminal anyway.
			self.settings['NOCOLOR'] = 'true'

		if self._enable_ipc_daemon:
			self.settings.pop('PORTAGE_EBUILD_EXIT_FILE', None)
			if self.phase not in self._phases_without_builddir:
				if 'PORTAGE_BUILDIR_LOCKED' not in self.settings:
					self._build_dir = EbuildBuildDir(
						scheduler=self.scheduler, settings=self.settings)
					self._build_dir.lock()
				self.settings['PORTAGE_IPC_DAEMON'] = "1"
				self._start_ipc_daemon()
			else:
				self.settings.pop('PORTAGE_IPC_DAEMON', None)
		else:
			# Since the IPC daemon is disabled, use a simple tempfile based
			# approach to detect unexpected exit like in bug #190128.
			self.settings.pop('PORTAGE_IPC_DAEMON', None)
			if self.phase not in self._phases_without_builddir:
				exit_file = os.path.join(
					self.settings['PORTAGE_BUILDDIR'],
					'.exit_status')
				self.settings['PORTAGE_EBUILD_EXIT_FILE'] = exit_file
				try:
					os.unlink(exit_file)
				except OSError:
					if os.path.exists(exit_file):
						# make sure it doesn't exist
						raise
			else:
				self.settings.pop('PORTAGE_EBUILD_EXIT_FILE', None)

		SpawnProcess._start(self)

	def _prefetch_exit(self, prefetcher):

		if self._was_cancelled():
			self.wait()
			return

		opts = self.opts
		pkg = self.pkg
		settings = self.settings

		if opts.fetchonly:
			if opts.pretend:
				fetcher = EbuildFetchonly(
					fetch_all=opts.fetch_all_uri,
					pkg=pkg, pretend=opts.pretend,
					settings=settings)
				retval = fetcher.execute()
				if retval == os.EX_OK:
					self._current_task = None
					self.returncode = os.EX_OK
					self._async_wait()
				else:
					# For pretend mode, the convention it to execute
					# pkg_nofetch and return a successful exitcode.
					self._start_task(SpawnNofetchWithoutBuilddir(
						background=self.background,
						portdb=self.pkg.root_config.trees[self._tree].dbapi,
						ebuild_path=self._ebuild_path,
						scheduler=self.scheduler,
						settings=self.settings),
						self._default_final_exit)
				return
			else:
				fetcher = EbuildFetcher(
					config_pool=self.config_pool,
					ebuild_path=self._ebuild_path,
					fetchall=self.opts.fetch_all_uri,
					fetchonly=self.opts.fetchonly,
					background=False,
					logfile=None,
					pkg=self.pkg,
					scheduler=self.scheduler)
				self._start_task(fetcher, self._fetchonly_exit)
				return

		self._build_dir = EbuildBuildDir(
			scheduler=self.scheduler, settings=settings)
		self._start_task(
			AsyncTaskFuture(future=self._build_dir.async_lock()),
			self._start_pre_clean)

	def _start(self):

		pkg = self.pkg
		settings = self.settings
		settings.setcpv(pkg)
		self._tree = "bintree"
		self._bintree = self.pkg.root_config.trees[self._tree]
		self._verify = not self.opts.pretend

		# Use realpath like doebuild_environment() does, since we assert
		# that this path is literally identical to PORTAGE_BUILDDIR.
		dir_path = os.path.join(os.path.realpath(settings["PORTAGE_TMPDIR"]),
			"portage", pkg.category, pkg.pf)
		self._image_dir = os.path.join(dir_path, "image")
		self._infloc = os.path.join(dir_path, "build-info")
		self._ebuild_path = os.path.join(self._infloc, pkg.pf + ".ebuild")
		settings["EBUILD"] = self._ebuild_path
		portage.doebuild_environment(self._ebuild_path, 'setup',
			settings=self.settings, db=self._bintree.dbapi)
		if dir_path != self.settings['PORTAGE_BUILDDIR']:
			raise AssertionError("'%s' != '%s'" % \
				(dir_path, self.settings['PORTAGE_BUILDDIR']))
		self._build_dir = EbuildBuildDir(
			scheduler=self.scheduler, settings=settings)
		settings.configdict["pkg"]["EMERGE_FROM"] = "binary"
		settings.configdict["pkg"]["MERGE_TYPE"] = "binary"

		if eapi_exports_replace_vars(settings["EAPI"]):
			vardb = self.pkg.root_config.trees["vartree"].dbapi
			settings["REPLACING_VERSIONS"] = " ".join(
				set(portage.versions.cpv_getversion(x) \
					for x in vardb.match(self.pkg.slot_atom) + \
					vardb.match('='+self.pkg.cpv)))

		# The prefetcher has already completed or it
		# could be running now. If it's running now,
		# wait for it to complete since it holds
		# a lock on the file being fetched. The
		# portage.locks functions are only designed
		# to work between separate processes. Since
		# the lock is held by the current process,
		# use the scheduler and fetcher methods to
		# synchronize with the fetcher.
		prefetcher = self.prefetcher
		if prefetcher is None:
			pass
		elif prefetcher.isAlive() and \
			prefetcher.poll() is None:

			if not self.background:
				fetch_log = os.path.join(
					_emerge.emergelog._emerge_log_dir, 'emerge-fetch.log')
				msg = (
					'Fetching in the background:',
					prefetcher.pkg_path,
					'To view fetch progress, run in another terminal:',
					'tail -f %s' % fetch_log,
				)
				out = portage.output.EOutput()
				for l in msg:
					out.einfo(l)

			self._current_task = prefetcher
			prefetcher.addExitListener(self._prefetch_exit)
			return

		self._prefetch_exit(prefetcher)

class AbstractEbuildProcess(SpawnProcess):

	__slots__ = ('phase', 'settings',) + \
		('_build_dir', '_ipc_daemon', '_exit_command', '_exit_timeout_id')

	_phases_without_builddir = ('clean', 'cleanrm', 'depend', 'help',)
	_phases_interactive_whitelist = ('config',)
	_phases_without_cgroup = ('preinst', 'postinst', 'prerm', 'postrm', 'config')

	# Number of milliseconds to allow natural exit of the ebuild
	# process after it has called the exit command via IPC. It
	# doesn't hurt to be generous here since the scheduler
	# continues to process events during this period, and it can
	# return long before the timeout expires.
	_exit_timeout = 10000 # 10 seconds

	# The EbuildIpcDaemon support is well tested, but this variable
	# is left so we can temporarily disable it if any issues arise.
	_enable_ipc_daemon = True

	def __init__(self, **kwargs):
		SpawnProcess.__init__(self, **kwargs)
		if self.phase is None:
			phase = self.settings.get("EBUILD_PHASE")
			if not phase:
				phase = 'other'
			self.phase = phase

	def _start(self):

		need_builddir = self.phase not in self._phases_without_builddir

		# This can happen if the pre-clean phase triggers
		# die_hooks for some reason, and PORTAGE_BUILDDIR
		# doesn't exist yet.
		if need_builddir and \
			not os.path.isdir(self.settings['PORTAGE_BUILDDIR']):
			msg = _("The ebuild phase '%s' has been aborted "
			"since PORTAGE_BUILDDIR does not exist: '%s'") % \
			(self.phase, self.settings['PORTAGE_BUILDDIR'])
			self._eerror(textwrap.wrap(msg, 72))
			self._set_returncode((self.pid, 1 << 8))
			self._async_wait()
			return

		# Check if the cgroup hierarchy is in place. If it's not, mount it.
		if (os.geteuid() == 0 and platform.system() == 'Linux'
				and 'cgroup' in self.settings.features
				and self.phase not in self._phases_without_cgroup):
			cgroup_root = '/sys/fs/cgroup'
			cgroup_portage = os.path.join(cgroup_root, 'portage')

			try:
				# cgroup tmpfs
				if not os.path.ismount(cgroup_root):
					# we expect /sys/fs to be there already
					if not os.path.isdir(cgroup_root):
						os.mkdir(cgroup_root, 0o755)
					subprocess.check_call(['mount', '-t', 'tmpfs',
						'-o', 'rw,nosuid,nodev,noexec,mode=0755',
						'tmpfs', cgroup_root])

				# portage subsystem
				if not os.path.ismount(cgroup_portage):
					if not os.path.isdir(cgroup_portage):
						os.mkdir(cgroup_portage, 0o755)
					subprocess.check_call(['mount', '-t', 'cgroup',
						'-o', 'rw,nosuid,nodev,noexec,none,name=portage',
						'tmpfs', cgroup_portage])

				cgroup_path = tempfile.mkdtemp(dir=cgroup_portage,
					prefix='%s:%s.' % (self.settings["CATEGORY"],
					self.settings["PF"]))
			except (subprocess.CalledProcessError, OSError):
				pass
			else:
				self.cgroup = cgroup_path

		if self.background:
			# Automatically prevent color codes from showing up in logs,
			# since we're not displaying to a terminal anyway.
			self.settings['NOCOLOR'] = 'true'

		if self._enable_ipc_daemon:
			self.settings.pop('PORTAGE_EBUILD_EXIT_FILE', None)
			if self.phase not in self._phases_without_builddir:
				if 'PORTAGE_BUILDDIR_LOCKED' not in self.settings:
					self._build_dir = EbuildBuildDir(
						scheduler=self.scheduler, settings=self.settings)
					self._build_dir.lock()
				self.settings['PORTAGE_IPC_DAEMON'] = "1"
				self._start_ipc_daemon()
			else:
				self.settings.pop('PORTAGE_IPC_DAEMON', None)
		else:
			# Since the IPC daemon is disabled, use a simple tempfile based
			# approach to detect unexpected exit like in bug #190128.
			self.settings.pop('PORTAGE_IPC_DAEMON', None)
			if self.phase not in self._phases_without_builddir:
				exit_file = os.path.join(
#.........这里部分代码省略.........

class EbuildBuild(CompositeTask):

	__slots__ = ("args_set", "config_pool", "find_blockers",
		"ldpath_mtimes", "logger", "opts", "pkg", "pkg_count",
		"prefetcher", "settings", "world_atom") + \
		("_build_dir", "_buildpkg", "_ebuild_path", "_issyspkg", "_tree")

	def _start(self):

		pkg = self.pkg
		settings = self.settings

		rval = _check_temp_dir(settings)
		if rval != os.EX_OK:
			self.returncode = rval
			self._current_task = None
			self.wait()
			return

		root_config = pkg.root_config
		tree = "porttree"
		self._tree = tree
		portdb = root_config.trees[tree].dbapi
		settings.setcpv(pkg)
		settings.configdict["pkg"]["EMERGE_FROM"] = pkg.type_name
		ebuild_path = portdb.findname(pkg.cpv)
		if ebuild_path is None:
			raise AssertionError("ebuild not found for '%s'" % pkg.cpv)
		self._ebuild_path = ebuild_path

		# Check the manifest here since with --keep-going mode it's
		# currently possible to get this far with a broken manifest.
		if not self._check_manifest():
			self.returncode = 1
			self._current_task = None
			self.wait()
			return

		prefetcher = self.prefetcher
		if prefetcher is None:
			pass
		elif not prefetcher.isAlive():
			prefetcher.cancel()
		elif prefetcher.poll() is None:

			waiting_msg = "Fetching files " + \
				"in the background. " + \
				"To view fetch progress, run `tail -f " + \
				"/var/log/emerge-fetch.log` in another " + \
				"terminal."
			msg_prefix = colorize("GOOD", " * ")
			from textwrap import wrap
			waiting_msg = "".join("%s%s\n" % (msg_prefix, line) \
				for line in wrap(waiting_msg, 65))
			if not self.background:
				writemsg(waiting_msg, noiselevel=-1)

			self._current_task = prefetcher
			prefetcher.addExitListener(self._prefetch_exit)
			return

		self._prefetch_exit(prefetcher)

	def _check_manifest(self):
		success = True

		settings = self.settings
		if 'strict' in settings.features:
			settings['O'] = os.path.dirname(self._ebuild_path)
			quiet_setting = settings.get('PORTAGE_QUIET')
			settings['PORTAGE_QUIET'] = '1'
			try:
				success = digestcheck([], settings, strict=True)
			finally:
				if quiet_setting:
					settings['PORTAGE_QUIET'] = quiet_setting
				else:
					del settings['PORTAGE_QUIET']

		return success

	def _prefetch_exit(self, prefetcher):

		opts = self.opts
		pkg = self.pkg
		settings = self.settings

		if opts.fetchonly:
				fetcher = EbuildFetchonly(
					fetch_all=opts.fetch_all_uri,
					pkg=pkg, pretend=opts.pretend,
					settings=settings)
				retval = fetcher.execute()
				self.returncode = retval
				self.wait()
				return

		self._build_dir = EbuildBuildDir(pkg=pkg, settings=settings)
		self._build_dir.lock()

#.........这里部分代码省略.........

class Binpkg(CompositeTask):

	__slots__ = ("find_blockers",
		"ldpath_mtimes", "logger", "opts",
		"pkg", "pkg_count", "prefetcher", "settings", "world_atom") + \
		("_bintree", "_build_dir", "_build_prefix",
		"_ebuild_path", "_fetched_pkg",
		"_image_dir", "_infloc", "_pkg_path", "_tree", "_verify")

	def _writemsg_level(self, msg, level=0, noiselevel=0):
		self.scheduler.output(msg, level=level, noiselevel=noiselevel,
			log_path=self.settings.get("PORTAGE_LOG_FILE"))

	def _start(self):

		pkg = self.pkg
		settings = self.settings
		settings.setcpv(pkg)
		self._tree = "bintree"
		self._bintree = self.pkg.root_config.trees[self._tree]
		self._verify = not self.opts.pretend

		# Use realpath like doebuild_environment() does, since we assert
		# that this path is literally identical to PORTAGE_BUILDDIR.
		dir_path = os.path.join(os.path.realpath(settings["PORTAGE_TMPDIR"]),
			"portage", pkg.category, pkg.pf)
		self._image_dir = os.path.join(dir_path, "image")
		self._infloc = os.path.join(dir_path, "build-info")
		self._ebuild_path = os.path.join(self._infloc, pkg.pf + ".ebuild")
		settings["EBUILD"] = self._ebuild_path
		portage.doebuild_environment(self._ebuild_path, 'setup',
			settings=self.settings, db=self._bintree.dbapi)
		if dir_path != self.settings['PORTAGE_BUILDDIR']:
			raise AssertionError("'%s' != '%s'" % \
				(dir_path, self.settings['PORTAGE_BUILDDIR']))
		self._build_dir = EbuildBuildDir(
			scheduler=self.scheduler, settings=settings)
		settings.configdict["pkg"]["EMERGE_FROM"] = "binary"
		settings.configdict["pkg"]["MERGE_TYPE"] = "binary"

		if eapi_exports_replace_vars(settings["EAPI"]):
			vardb = self.pkg.root_config.trees["vartree"].dbapi
			settings["REPLACING_VERSIONS"] = " ".join(
				set(portage.versions.cpv_getversion(x) \
					for x in vardb.match(self.pkg.slot_atom) + \
					vardb.match('='+self.pkg.cpv)))

		# The prefetcher has already completed or it
		# could be running now. If it's running now,
		# wait for it to complete since it holds
		# a lock on the file being fetched. The
		# portage.locks functions are only designed
		# to work between separate processes. Since
		# the lock is held by the current process,
		# use the scheduler and fetcher methods to
		# synchronize with the fetcher.
		prefetcher = self.prefetcher
		if prefetcher is None:
			pass
		elif prefetcher.isAlive() and \
			prefetcher.poll() is None:

			if not self.background:
				fetch_log = os.path.join(
					_emerge.emergelog._emerge_log_dir, 'emerge-fetch.log')
				msg = (
					'Fetching in the background:',
					prefetcher.pkg_path,
					'To view fetch progress, run in another terminal:',
					'tail -f %s' % fetch_log,
				)
				out = portage.output.EOutput()
				for l in msg:
					out.einfo(l)

			self._current_task = prefetcher
			prefetcher.addExitListener(self._prefetch_exit)
			return

		self._prefetch_exit(prefetcher)

	def _prefetch_exit(self, prefetcher):

		if self._was_cancelled():
			self.wait()
			return

		pkg = self.pkg
		pkg_count = self.pkg_count
		if not (self.opts.pretend or self.opts.fetchonly):
			self._build_dir.lock()
			# Initialize PORTAGE_LOG_FILE (clean_log won't work without it).
			portage.prepare_build_dirs(self.settings["ROOT"], self.settings, 1)
			# If necessary, discard old log so that we don't
			# append to it.
			self._build_dir.clean_log()
		fetcher = BinpkgFetcher(background=self.background,
			logfile=self.settings.get("PORTAGE_LOG_FILE"), pkg=self.pkg,
			pretend=self.opts.pretend, scheduler=self.scheduler)

#.........这里部分代码省略.........

	def _start(self):

		root_config = self.pkg.root_config
		portdb = root_config.trees["porttree"].dbapi
		ebuild_path = portdb.findname(self.pkg.cpv)
		if ebuild_path is None:
			raise AssertionError("ebuild not found for '%s'" % self.pkg.cpv)
		settings = self.config_pool.allocate()
		settings.setcpv(self.pkg)
		if self.prefetch and \
			self._prefetch_size_ok(portdb, settings, ebuild_path):
			self.config_pool.deallocate(settings)
			self.returncode = os.EX_OK
			self.wait()
			return

		# In prefetch mode, logging goes to emerge-fetch.log and the builddir
		# should not be touched since otherwise it could interfere with
		# another instance of the same cpv concurrently being built for a
		# different $ROOT (currently, builds only cooperate with prefetchers
		# that are spawned for the same $ROOT).
		if not self.prefetch:
			self._build_dir = EbuildBuildDir(pkg=self.pkg, settings=settings)
			self._build_dir.lock()
			self._build_dir.clean_log()
			cleanup=1
			# This initializes PORTAGE_LOG_FILE.
			portage.prepare_build_dirs(self.pkg.root, self._build_dir.settings, cleanup)
			if self.logfile is None:
				self.logfile = settings.get("PORTAGE_LOG_FILE")

		phase = "fetch"
		if self.fetchall:
			phase = "fetchall"

		# If any incremental variables have been overridden
		# via the environment, those values need to be passed
		# along here so that they are correctly considered by
		# the config instance in the subproccess.
		fetch_env = os.environ.copy()
		fetch_env['PORTAGE_CONFIGROOT'] = settings['PORTAGE_CONFIGROOT']

		nocolor = settings.get("NOCOLOR")
		if nocolor is not None:
			fetch_env["NOCOLOR"] = nocolor

		fetch_env["PORTAGE_NICENESS"] = "0"
		if self.prefetch:
			fetch_env["PORTAGE_PARALLEL_FETCHONLY"] = "1"

		ebuild_binary = os.path.join(
			settings["PORTAGE_BIN_PATH"], "ebuild")

		fetch_args = [ebuild_binary, ebuild_path, phase]
		debug = settings.get("PORTAGE_DEBUG") == "1"
		if debug:
			fetch_args.append("--debug")

		if not self.background and nocolor not in ('yes', 'true'):
			# Force consistent color output, in case we are capturing fetch
			# output through a normal pipe due to unavailability of ptys.
			fetch_args.append('--color=y')

		self.args = fetch_args
		self.env = fetch_env
		if self._build_dir is None:
			# Free settings now since we only have a local reference.
			self.config_pool.deallocate(settings)
		SpawnProcess._start(self)

class EbuildFetcher(SpawnProcess):

	__slots__ = ("config_pool", "fetchonly", "fetchall", "pkg", "prefetch") + \
		("_build_dir",)

	def _start(self):

		root_config = self.pkg.root_config
		portdb = root_config.trees["porttree"].dbapi
		ebuild_path = portdb.findname(self.pkg.cpv)
		if ebuild_path is None:
			raise AssertionError("ebuild not found for '%s'" % self.pkg.cpv)
		settings = self.config_pool.allocate()
		settings.setcpv(self.pkg)
		if self.prefetch and \
			self._prefetch_size_ok(portdb, settings, ebuild_path):
			self.config_pool.deallocate(settings)
			self.returncode = os.EX_OK
			self.wait()
			return

		# In prefetch mode, logging goes to emerge-fetch.log and the builddir
		# should not be touched since otherwise it could interfere with
		# another instance of the same cpv concurrently being built for a
		# different $ROOT (currently, builds only cooperate with prefetchers
		# that are spawned for the same $ROOT).
		if not self.prefetch:
			self._build_dir = EbuildBuildDir(pkg=self.pkg, settings=settings)
			self._build_dir.lock()
			self._build_dir.clean_log()
			cleanup=1
			# This initializes PORTAGE_LOG_FILE.
			portage.prepare_build_dirs(self.pkg.root, self._build_dir.settings, cleanup)
			if self.logfile is None:
				self.logfile = settings.get("PORTAGE_LOG_FILE")

		phase = "fetch"
		if self.fetchall:
			phase = "fetchall"

		# If any incremental variables have been overridden
		# via the environment, those values need to be passed
		# along here so that they are correctly considered by
		# the config instance in the subproccess.
		fetch_env = os.environ.copy()
		fetch_env['PORTAGE_CONFIGROOT'] = settings['PORTAGE_CONFIGROOT']

		nocolor = settings.get("NOCOLOR")
		if nocolor is not None:
			fetch_env["NOCOLOR"] = nocolor

		fetch_env["PORTAGE_NICENESS"] = "0"
		if self.prefetch:
			fetch_env["PORTAGE_PARALLEL_FETCHONLY"] = "1"

		ebuild_binary = os.path.join(
			settings["PORTAGE_BIN_PATH"], "ebuild")

		fetch_args = [ebuild_binary, ebuild_path, phase]
		debug = settings.get("PORTAGE_DEBUG") == "1"
		if debug:
			fetch_args.append("--debug")

		if not self.background and nocolor not in ('yes', 'true'):
			# Force consistent color output, in case we are capturing fetch
			# output through a normal pipe due to unavailability of ptys.
			fetch_args.append('--color=y')

		self.args = fetch_args
		self.env = fetch_env
		if self._build_dir is None:
			# Free settings now since we only have a local reference.
			self.config_pool.deallocate(settings)
		SpawnProcess._start(self)

	def _prefetch_size_ok(self, portdb, settings, ebuild_path):
		pkgdir = os.path.dirname(ebuild_path)
		mytree = os.path.dirname(os.path.dirname(pkgdir))
		distdir = settings["DISTDIR"]
		use = None
		if not self.fetchall:
			use = self.pkg.use.enabled

		try:
			uri_map = portdb.getFetchMap(self.pkg.cpv,
				useflags=use, mytree=mytree)
		except portage.exception.InvalidDependString as e:
			return False

		sizes = {}
		for filename in uri_map:
			# Use stat rather than lstat since portage.fetch() creates
			# symlinks when PORTAGE_RO_DISTDIRS is used.
			try:
				st = os.stat(os.path.join(distdir, filename))
			except OSError:
				return False
			if st.st_size == 0:
				return False
			sizes[filename] = st.st_size
#.........这里部分代码省略.........

	def testIpcDaemon(self):
		tmpdir = tempfile.mkdtemp()
		build_dir = None
		try:
			env = {}

			# Pass along PORTAGE_USERNAME and PORTAGE_GRPNAME since they
			# need to be inherited by ebuild subprocesses.
			if 'PORTAGE_USERNAME' in os.environ:
				env['PORTAGE_USERNAME'] = os.environ['PORTAGE_USERNAME']
			if 'PORTAGE_GRPNAME' in os.environ:
				env['PORTAGE_GRPNAME'] = os.environ['PORTAGE_GRPNAME']

			env['PORTAGE_PYTHON'] = _python_interpreter
			env['PORTAGE_BIN_PATH'] = PORTAGE_BIN_PATH
			env['PORTAGE_PYM_PATH'] = PORTAGE_PYM_PATH
			env['PORTAGE_BUILDDIR'] = os.path.join(tmpdir, 'cat', 'pkg-1')

			task_scheduler = TaskScheduler(max_jobs=2)
			build_dir = EbuildBuildDir(
				scheduler=task_scheduler.sched_iface,
				settings=env)
			build_dir.lock()
			ensure_dirs(env['PORTAGE_BUILDDIR'])

			input_fifo = os.path.join(env['PORTAGE_BUILDDIR'], '.ipc_in')
			output_fifo = os.path.join(env['PORTAGE_BUILDDIR'], '.ipc_out')
			os.mkfifo(input_fifo)
			os.mkfifo(output_fifo)

			for exitcode in (0, 1, 2):
				exit_command = ExitCommand()
				commands = {'exit' : exit_command}
				daemon = EbuildIpcDaemon(commands=commands,
					input_fifo=input_fifo,
					output_fifo=output_fifo,
					scheduler=task_scheduler.sched_iface)
				proc = SpawnProcess(
					args=[BASH_BINARY, "-c",
					'"$PORTAGE_BIN_PATH"/ebuild-ipc exit %d' % exitcode],
					env=env, scheduler=task_scheduler.sched_iface)

				self.received_command = False
				def exit_command_callback():
					self.received_command = True
					proc.cancel()
					daemon.cancel()

				exit_command.reply_hook = exit_command_callback
				task_scheduler.add(daemon)
				task_scheduler.add(proc)
				start_time = time.time()
				task_scheduler.run(timeout=self._SCHEDULE_TIMEOUT)
				task_scheduler.clear()

				self.assertEqual(self.received_command, True,
					"command not received after %d seconds" % \
					(time.time() - start_time,))
				self.assertEqual(proc.isAlive(), False)
				self.assertEqual(daemon.isAlive(), False)
				self.assertEqual(exit_command.exitcode, exitcode)

			# Intentionally short timeout test for QueueScheduler.run()
			sleep_time_s = 10      # 10.000 seconds
			short_timeout_ms = 10  #  0.010 seconds

			for i in range(3):
				exit_command = ExitCommand()
				commands = {'exit' : exit_command}
				daemon = EbuildIpcDaemon(commands=commands,
					input_fifo=input_fifo,
					output_fifo=output_fifo,
					scheduler=task_scheduler.sched_iface)
				proc = SpawnProcess(
					args=[BASH_BINARY, "-c", 'exec sleep %d' % sleep_time_s],
					env=env, scheduler=task_scheduler.sched_iface)

				self.received_command = False
				def exit_command_callback():
					self.received_command = True
					proc.cancel()
					daemon.cancel()

				exit_command.reply_hook = exit_command_callback
				task_scheduler.add(daemon)
				task_scheduler.add(proc)
				start_time = time.time()
				task_scheduler.run(timeout=short_timeout_ms)
				task_scheduler.clear()

				self.assertEqual(self.received_command, False,
					"command received after %d seconds" % \
					(time.time() - start_time,))
				self.assertEqual(proc.isAlive(), False)
				self.assertEqual(daemon.isAlive(), False)
				self.assertEqual(proc.returncode == os.EX_OK, False)

		finally:
			if build_dir is not None:
				build_dir.unlock()
#.........这里部分代码省略.........

class PackageUninstall(CompositeTask):
	"""
	Uninstall a package asynchronously in a subprocess. When
	both parallel-install and ebuild-locks FEATURES are enabled,
	it is essential for the ebuild-locks code to execute in a
	subprocess, since the portage.locks module does not behave
	as desired if we try to lock the same file multiple times
	concurrently from the same process for ebuild-locks phases
	such as pkg_setup, pkg_prerm, and pkg_postrm.
	"""

	__slots__ = ("world_atom", "ldpath_mtimes", "opts",
			"pkg", "settings", "_builddir_lock")

	def _start(self):

		vardb = self.pkg.root_config.trees["vartree"].dbapi
		dbdir = vardb.getpath(self.pkg.cpv)
		if not os.path.exists(dbdir):
			# Apparently the package got uninstalled
			# already, so we can safely return early.
			self.returncode = os.EX_OK
			self._async_wait()
			return

		self.settings.setcpv(self.pkg)
		cat, pf = portage.catsplit(self.pkg.cpv)
		myebuildpath = os.path.join(dbdir, pf + ".ebuild")

		try:
			portage.doebuild_environment(myebuildpath, "prerm",
				settings=self.settings, db=vardb)
		except UnsupportedAPIException:
			# This is safe to ignore since this function is
			# guaranteed to set PORTAGE_BUILDDIR even though
			# it raises UnsupportedAPIException. The error
			# will be logged when it prevents the pkg_prerm
			# and pkg_postrm phases from executing.
			pass

		self._builddir_lock = EbuildBuildDir(
			scheduler=self.scheduler, settings=self.settings)
		self._builddir_lock.lock()

		portage.prepare_build_dirs(
			settings=self.settings, cleanup=True)

		# Output only gets logged if it comes after prepare_build_dirs()
		# which initializes PORTAGE_LOG_FILE.
		retval, pkgmap = _unmerge_display(self.pkg.root_config,
			self.opts, "unmerge", [self.pkg.cpv], clean_delay=0,
			writemsg_level=self._writemsg_level)

		if retval != os.EX_OK:
			self._builddir_lock.unlock()
			self.returncode = retval
			self._async_wait()
			return

		self._writemsg_level(">>> Unmerging %s...\n" % (self.pkg.cpv,),
			noiselevel=-1)
		self._emergelog("=== Unmerging... (%s)" % (self.pkg.cpv,))

		unmerge_task = MergeProcess(
			mycat=cat, mypkg=pf, settings=self.settings,
			treetype="vartree", vartree=self.pkg.root_config.trees["vartree"],
			scheduler=self.scheduler, background=self.background,
			mydbapi=self.pkg.root_config.trees["vartree"].dbapi,
			prev_mtimes=self.ldpath_mtimes,
			logfile=self.settings.get("PORTAGE_LOG_FILE"), unmerge=True)

		self._start_task(unmerge_task, self._unmerge_exit)

	def _unmerge_exit(self, unmerge_task):
		if self._final_exit(unmerge_task) != os.EX_OK:
			self._emergelog(" !!! unmerge FAILURE: %s" % (self.pkg.cpv,))
		else:
			self._emergelog(" >>> unmerge success: %s" % (self.pkg.cpv,))
			self.world_atom(self.pkg)
		self._builddir_lock.unlock()
		self.wait()

	def _emergelog(self, msg):
		emergelog("notitles" not in self.settings.features, msg)

	def _writemsg_level(self, msg, level=0, noiselevel=0):

		log_path = self.settings.get("PORTAGE_LOG_FILE")
		background = self.background

		if log_path is None:
			if not (background and level < logging.WARNING):
				portage.util.writemsg_level(msg,
					level=level, noiselevel=noiselevel)
		else:
			self.scheduler.output(msg, log_path=log_path,
				level=level, noiselevel=noiselevel)

	def _prefetch_exit(self, prefetcher):

		if self._was_cancelled():
			self.wait()
			return

		opts = self.opts
		pkg = self.pkg
		settings = self.settings

		if opts.fetchonly:
			if opts.pretend:
				fetcher = EbuildFetchonly(
					fetch_all=opts.fetch_all_uri,
					pkg=pkg, pretend=opts.pretend,
					settings=settings)
				retval = fetcher.execute()
				if retval == os.EX_OK:
					self._current_task = None
					self.returncode = os.EX_OK
					self._async_wait()
				else:
					# For pretend mode, the convention it to execute
					# pkg_nofetch and return a successful exitcode.
					self._start_task(SpawnNofetchWithoutBuilddir(
						background=self.background,
						portdb=self.pkg.root_config.trees[self._tree].dbapi,
						ebuild_path=self._ebuild_path,
						scheduler=self.scheduler,
						settings=self.settings),
						self._default_final_exit)
				return
			else:
				fetcher = EbuildFetcher(
					config_pool=self.config_pool,
					ebuild_path=self._ebuild_path,
					fetchall=self.opts.fetch_all_uri,
					fetchonly=self.opts.fetchonly,
					background=False,
					logfile=None,
					pkg=self.pkg,
					scheduler=self.scheduler)
				self._start_task(fetcher, self._fetchonly_exit)
				return

		self._build_dir = EbuildBuildDir(
			scheduler=self.scheduler, settings=settings)
		self._build_dir.lock()

		# Cleaning needs to happen before fetch, since the build dir
		# is used for log handling.
		msg = " === (%s of %s) Cleaning (%s::%s)" % \
			(self.pkg_count.curval, self.pkg_count.maxval,
			self.pkg.cpv, self._ebuild_path)
		short_msg = "emerge: (%s of %s) %s Clean" % \
			(self.pkg_count.curval, self.pkg_count.maxval, self.pkg.cpv)
		self.logger.log(msg, short_msg=short_msg)

		pre_clean_phase = EbuildPhase(background=self.background,
			phase='clean', scheduler=self.scheduler, settings=self.settings)
		self._start_task(pre_clean_phase, self._pre_clean_exit)