utils/repo_manifest.py - third_party/chromite - Git at Google

 # Copyright 2018 The ChromiumOS Authors
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.

 """Common functions for interacting with repo manifest XML files."""

 from xml.etree import ElementTree


 class Error(Exception):
     """An error related to repo manifests."""


 class InvalidManifest(Error):
     """The manifest data has invalid values or structure."""


 class UnsupportedFeature(Error):
     """The manifest data uses features that are not supported by this code."""


 class Manifest(object):
     """Manifest represents the contents of a repo manifest XML file."""

     # https://chromium.googlesource.com/external/repo/+/HEAD/docs/manifest-format.md

     def __init__(self, etree, allow_unsupported_features=False):
         """Initialize Manifest.

         Args:
             etree: An ElementTree object representing a manifest XML file.
             allow_unsupported_features: If true, will not explode if manifest
                 contains unsupported features such as includes.
         """
         self._etree = etree
         self._allow_unsupported_features = allow_unsupported_features
         self._ValidateTree()

     # These __*state__ pickle protocol methods are intended for multiprocessing.

     def __getstate__(self):
         """Return pickleable state for this Manifest."""
         return (
             ElementTree.tostring(self._etree.getroot(), encoding="unicode"),
             self._allow_unsupported_features,
         )

     def __setstate__(self, state):
         """Set the state from pickle for this Manifest."""
         tree_string, allow_unsupported_features = state
         root = ElementTree.fromstring(tree_string)
         self._etree = ElementTree.ElementTree(root)
         self._allow_unsupported_features = allow_unsupported_features

     def _ValidateTree(self):
         """Raise Error if self._etree is not a valid manifest tree."""
         root = self._etree.getroot()
         if root is None:
             raise InvalidManifest("no data")
         if root.tag != "manifest":
             raise InvalidManifest(
                 "expected root <manifest>, got <%s>" % root.tag
             )
         if not self._allow_unsupported_features:
             if self._etree.find("./project/project") is not None:
                 raise UnsupportedFeature("nested <project>")
             for unsupported_tag in (
                 "extend-project",
                 "remove-project",
                 "include",
             ):
                 if self._etree.find(unsupported_tag) is not None:
                     raise UnsupportedFeature("<%s>" % unsupported_tag)

     @classmethod
     def FromFile(cls, source, allow_unsupported_features=False):
         """Parse XML into a Manifest.

         Args:
             source: A string path or file object containing XML data.
             allow_unsupported_features: If true, will not explode if manifest
                 contains unsupported features such as includes.

         Raises:
             Error: If source couldn't be parsed into a Manifest.
         """
         return cls(
             ElementTree.parse(source),
             allow_unsupported_features=allow_unsupported_features,
         )

     @classmethod
     def FromString(cls, data, allow_unsupported_features=False):
         """Parse XML into a Manifest.

         Args:
             data: A string containing XML data.
             allow_unsupported_features: If true, will not explode if manifest
                 contains unsupported features such as includes.

         Raises:
             Error: If data couldn't be parsed into a Manifest.
         """
         root = ElementTree.fromstring(data)
         return cls(
             ElementTree.ElementTree(root),
             allow_unsupported_features=allow_unsupported_features,
         )

     def Write(self, dest):
         """Write the Manifest as XML.

         Args:
             dest: A string path or file object to write to.

         Raises:
             Error: If the Manifest contains invalid data.
         """
         self._ValidateTree()
         self._etree.write(dest, encoding="UTF-8", xml_declaration=True)

     def Default(self):
         """Return this Manifest's Default or an empty Default."""
         default_element = self._etree.find("default")
         if default_element is None:
             default_element = ElementTree.fromstring("<default/>")
         return Default(self, default_element)

     def Includes(self):
         """Yield an Include for each <include> element in the manifest.

         This class does NOT process includes, so they are considered an unsupported
         feature. You must set allow_unsupported_features to use this function.
         """
         if not self._allow_unsupported_features:
             raise UnsupportedFeature(
                 "allow unsupported features to use Includes()"
             )
         for include_element in self._etree.iterfind("include"):
             yield Include(self, include_element)

     def Remotes(self):
         """Yield a Remote for each <remote> element in the manifest."""
         for remote_element in self._etree.iterfind("remote"):
             yield Remote(self, remote_element)

     def GetRemote(self, name):
         """Return the Remote with the given name.

         Raises:
             ValueError: If no Remote has the given name.
         """
         for remote in self.Remotes():
             if remote.name == name:
                 return remote
         raise ValueError("no remote named %s" % name)

     def Projects(self):
         """Yield a Project for each <project> element in the manifest."""
         for project_element in self._etree.iterfind("project"):
             yield Project(self, project_element)

     def GetUniqueProject(self, name, branch=None):
         """Return the unique Project with the given name and optional branch.

         Args:
             name: The name of the project to search for.
             branch: The optional branch to search (without the 'refs/heads/').

         Raises:
             ValueError: If there is not exactly one Project with the given name/branch
         """
         projects = []
         for project in self.Projects():
             # Strip the 'refs/heads/' from the branch name
             stripped_branch = project.Revision() or "master"
             if stripped_branch.startswith("refs/heads/"):
                 stripped_branch = stripped_branch[len("refs/heads/") :]
             if (
                 branch is None or stripped_branch == branch
             ) and project.name == name:
                 projects.append(project)
         if len(projects) != 1:
             raise ValueError(
                 "%s projects named %s on branch %s"
                 % (len(projects), name, branch)
             )
         return projects[0]


 class _ManifestElement(object):
     """Subclasses of _ManifestElement wrap Manifest child XML elements."""

     ATTRS = ()
     TAG = None

     def __init__(self, manifest, element):
         tag = self.TAG or self.__class__.__name__.lower()
         if element.tag != tag:
             raise ValueError(
                 "expected a <%s> but got a <%s>" % (tag, element.tag)
             )
         self._manifest = manifest
         self._el = element

     # These __*state__ pickle protocol methods are intended for multiprocessing.

     def __getstate__(self):
         """Return pickleable state for this element."""
         return (
             self._manifest,
             ElementTree.tostring(self._el, encoding="unicode"),
         )

     def __setstate__(self, state):
         """Set the state from pickle for this element."""
         self._manifest, xml_data = state
         self._el = ElementTree.fromstring(xml_data)

     def _XMLAttrName(self, name):
         """Return the XML attr name for the given Python attr name."""
         if name not in self.ATTRS:
             raise AttributeError(
                 "%r has no attribute %r" % (self.__class__.__name__, name)
             )
         return name.replace("_", "-")

     def __getattr__(self, name):
         return self._el.get(self._XMLAttrName(name))

     def __setattr__(self, name, value):
         if name.startswith("_"):
             super().__setattr__(name, value)
         else:
             self._el.set(self._XMLAttrName(name), value)

     def __delattr__(self, name):
         if name.startswith("_"):
             super().__delattr__(name)
         else:
             self._el.attrib.pop(self._XMLAttrName(name))

     def __str__(self):
         s = self.__class__.__name__
         if "name" in self.ATTRS:
             s = "%s %r" % (s, self.name)
         return "<%s>" % s

     def __repr__(self):
         return ElementTree.tostring(self._el, encoding="unicode")


 class Remote(_ManifestElement):
     """Remote represents a <remote> element of a Manifest."""

     ATTRS = ("name", "alias", "fetch", "pushurl", "review", "revision")

     def GitName(self):
         """Return the git remote name for this Remote."""
         return self.alias or self.name

     def PushURL(self):
         """Return the effective push URL of this Remote."""
         return self.pushurl or self.fetch


 class Include(_ManifestElement):
     """Include represents an <include> element of the manifest."""

     ATTRS = ("name",)


 class Default(_ManifestElement):
     """Default represents a <default> element of a Manifest."""

     ATTRS = ("remote", "revision", "dest_branch", "sync_j", "sync_c", "sync_s")


 class Project(_ManifestElement):
     """Project represents a <project> element of a Manifest."""

     ATTRS = (
         "name",
         "path",
         "remote",
         "revision",
         "dest_branch",
         "groups",
         "sync_c",
         "sync_s",
         "upstream",
         "clone_depth",
         "force_path",
     )

     def Path(self):
         """Return the effective filesystem path of this Project."""
         return self.path or self.name

     def RemoteName(self):
         """Return the effective remote name of this Project."""
         return self.remote or self._manifest.Default().remote

     def Remote(self):
         """Return the Remote for this Project."""
         return self._manifest.GetRemote(self.RemoteName())

     def Revision(self):
         """Return the effective revision of this Project."""
         return (
             self.revision
             or self.Remote().revision
             or self._manifest.Default().revision
         )

     def Annotations(self):
         """Return a dictionary from annotation key to annotation value."""
         return {
             child.get("name"): child.get("value")
             for child in self._el
             if child.tag == "annotation"
         }
	# Copyright 2018 The ChromiumOS Authors
	# Use of this source code is governed by a BSD-style license that can be
	# found in the LICENSE file.

	"""Common functions for interacting with repo manifest XML files."""

	from xml.etree import ElementTree


	class Error(Exception):
	"""An error related to repo manifests."""


	class InvalidManifest(Error):
	"""The manifest data has invalid values or structure."""


	class UnsupportedFeature(Error):
	"""The manifest data uses features that are not supported by this code."""


	class Manifest(object):
	"""Manifest represents the contents of a repo manifest XML file."""

	# https://chromium.googlesource.com/external/repo/+/HEAD/docs/manifest-format.md

	def __init__(self, etree, allow_unsupported_features=False):
	"""Initialize Manifest.

	Args:
	etree: An ElementTree object representing a manifest XML file.
	allow_unsupported_features: If true, will not explode if manifest
	contains unsupported features such as includes.
	"""
	self._etree = etree
	self._allow_unsupported_features = allow_unsupported_features
	self._ValidateTree()

	# These __*state__ pickle protocol methods are intended for multiprocessing.

	def __getstate__(self):
	"""Return pickleable state for this Manifest."""
	return (
	ElementTree.tostring(self._etree.getroot(), encoding="unicode"),
	self._allow_unsupported_features,
	)

	def __setstate__(self, state):
	"""Set the state from pickle for this Manifest."""
	tree_string, allow_unsupported_features = state
	root = ElementTree.fromstring(tree_string)
	self._etree = ElementTree.ElementTree(root)
	self._allow_unsupported_features = allow_unsupported_features

	def _ValidateTree(self):
	"""Raise Error if self._etree is not a valid manifest tree."""
	root = self._etree.getroot()
	if root is None:
	raise InvalidManifest("no data")
	if root.tag != "manifest":
	raise InvalidManifest(
	"expected root <manifest>, got <%s>" % root.tag
	)
	if not self._allow_unsupported_features:
	if self._etree.find("./project/project") is not None:
	raise UnsupportedFeature("nested <project>")
	for unsupported_tag in (
	"extend-project",
	"remove-project",
	"include",
	):
	if self._etree.find(unsupported_tag) is not None:
	raise UnsupportedFeature("<%s>" % unsupported_tag)

	@classmethod
	def FromFile(cls, source, allow_unsupported_features=False):
	"""Parse XML into a Manifest.

	Args:
	source: A string path or file object containing XML data.
	allow_unsupported_features: If true, will not explode if manifest
	contains unsupported features such as includes.

	Raises:
	Error: If source couldn't be parsed into a Manifest.
	"""
	return cls(
	ElementTree.parse(source),
	allow_unsupported_features=allow_unsupported_features,
	)

	@classmethod
	def FromString(cls, data, allow_unsupported_features=False):
	"""Parse XML into a Manifest.

	Args:
	data: A string containing XML data.
	allow_unsupported_features: If true, will not explode if manifest
	contains unsupported features such as includes.

	Raises:
	Error: If data couldn't be parsed into a Manifest.
	"""
	root = ElementTree.fromstring(data)
	return cls(
	ElementTree.ElementTree(root),
	allow_unsupported_features=allow_unsupported_features,
	)

	def Write(self, dest):
	"""Write the Manifest as XML.

	Args:
	dest: A string path or file object to write to.

	Raises:
	Error: If the Manifest contains invalid data.
	"""
	self._ValidateTree()
	self._etree.write(dest, encoding="UTF-8", xml_declaration=True)

	def Default(self):
	"""Return this Manifest's Default or an empty Default."""
	default_element = self._etree.find("default")
	if default_element is None:
	default_element = ElementTree.fromstring("<default/>")
	return Default(self, default_element)

	def Includes(self):
	"""Yield an Include for each <include> element in the manifest.

	This class does NOT process includes, so they are considered an unsupported
	feature. You must set allow_unsupported_features to use this function.
	"""
	if not self._allow_unsupported_features:
	raise UnsupportedFeature(
	"allow unsupported features to use Includes()"
	)
	for include_element in self._etree.iterfind("include"):
	yield Include(self, include_element)

	def Remotes(self):
	"""Yield a Remote for each <remote> element in the manifest."""
	for remote_element in self._etree.iterfind("remote"):
	yield Remote(self, remote_element)

	def GetRemote(self, name):
	"""Return the Remote with the given name.

	Raises:
	ValueError: If no Remote has the given name.
	"""
	for remote in self.Remotes():
	if remote.name == name:
	return remote
	raise ValueError("no remote named %s" % name)

	def Projects(self):
	"""Yield a Project for each <project> element in the manifest."""
	for project_element in self._etree.iterfind("project"):
	yield Project(self, project_element)

	def GetUniqueProject(self, name, branch=None):
	"""Return the unique Project with the given name and optional branch.

	Args:
	name: The name of the project to search for.
	branch: The optional branch to search (without the 'refs/heads/').

	Raises:
	ValueError: If there is not exactly one Project with the given name/branch
	"""
	projects = []
	for project in self.Projects():
	# Strip the 'refs/heads/' from the branch name
	stripped_branch = project.Revision() or "master"
	if stripped_branch.startswith("refs/heads/"):
	stripped_branch = stripped_branch[len("refs/heads/") :]
	if (
	branch is None or stripped_branch == branch
	) and project.name == name:
	projects.append(project)
	if len(projects) != 1:
	raise ValueError(
	"%s projects named %s on branch %s"
	% (len(projects), name, branch)
	)
	return projects[0]


	class _ManifestElement(object):
	"""Subclasses of _ManifestElement wrap Manifest child XML elements."""

	ATTRS = ()
	TAG = None

	def __init__(self, manifest, element):
	tag = self.TAG or self.__class__.__name__.lower()
	if element.tag != tag:
	raise ValueError(
	"expected a <%s> but got a <%s>" % (tag, element.tag)
	)
	self._manifest = manifest
	self._el = element

	# These __*state__ pickle protocol methods are intended for multiprocessing.

	def __getstate__(self):
	"""Return pickleable state for this element."""
	return (
	self._manifest,
	ElementTree.tostring(self._el, encoding="unicode"),
	)

	def __setstate__(self, state):
	"""Set the state from pickle for this element."""
	self._manifest, xml_data = state
	self._el = ElementTree.fromstring(xml_data)

	def _XMLAttrName(self, name):
	"""Return the XML attr name for the given Python attr name."""
	if name not in self.ATTRS:
	raise AttributeError(
	"%r has no attribute %r" % (self.__class__.__name__, name)
	)
	return name.replace("_", "-")

	def __getattr__(self, name):
	return self._el.get(self._XMLAttrName(name))

	def __setattr__(self, name, value):
	if name.startswith("_"):
	super().__setattr__(name, value)
	else:
	self._el.set(self._XMLAttrName(name), value)

	def __delattr__(self, name):
	if name.startswith("_"):
	super().__delattr__(name)
	else:
	self._el.attrib.pop(self._XMLAttrName(name))

	def __str__(self):
	s = self.__class__.__name__
	if "name" in self.ATTRS:
	s = "%s %r" % (s, self.name)
	return "<%s>" % s

	def __repr__(self):
	return ElementTree.tostring(self._el, encoding="unicode")


	class Remote(_ManifestElement):
	"""Remote represents a <remote> element of a Manifest."""

	ATTRS = ("name", "alias", "fetch", "pushurl", "review", "revision")

	def GitName(self):
	"""Return the git remote name for this Remote."""
	return self.alias or self.name

	def PushURL(self):
	"""Return the effective push URL of this Remote."""
	return self.pushurl or self.fetch


	class Include(_ManifestElement):
	"""Include represents an <include> element of the manifest."""

	ATTRS = ("name",)


	class Default(_ManifestElement):
	"""Default represents a <default> element of a Manifest."""

	ATTRS = ("remote", "revision", "dest_branch", "sync_j", "sync_c", "sync_s")


	class Project(_ManifestElement):
	"""Project represents a <project> element of a Manifest."""

	ATTRS = (
	"name",
	"path",
	"remote",
	"revision",
	"dest_branch",
	"groups",
	"sync_c",
	"sync_s",
	"upstream",
	"clone_depth",
	"force_path",
	)

	def Path(self):
	"""Return the effective filesystem path of this Project."""
	return self.path or self.name

	def RemoteName(self):
	"""Return the effective remote name of this Project."""
	return self.remote or self._manifest.Default().remote

	def Remote(self):
	"""Return the Remote for this Project."""
	return self._manifest.GetRemote(self.RemoteName())

	def Revision(self):
	"""Return the effective revision of this Project."""
	return (
	self.revision
	or self.Remote().revision
	or self._manifest.Default().revision
	)

	def Annotations(self):
	"""Return a dictionary from annotation key to annotation value."""
	return {
	child.get("name"): child.get("value")
	for child in self._el
	if child.tag == "annotation"
	}