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apache / buildstream / refs/tags/1.93.5 / . / src / buildstream / element.py
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#
# Copyright (C) 2016-2018 Codethink Limited
# Copyright (C) 2017-2020 Bloomberg Finance LP
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public
# License as published by the Free Software Foundation; either
# version 2 of the License, or (at your option) any later version.
#
# This library is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public
# License along with this library. If not, see <http://www.gnu.org/licenses/>.
#
# Authors:
# Tristan Van Berkom <tristan.vanberkom@codethink.co.uk>
"""
Element - Base element class
============================
.. _core_element_abstract_methods:
Abstract Methods
----------------
For loading and configuration purposes, Elements must implement the
:ref:`Plugin base class abstract methods <core_plugin_abstract_methods>`.
.. _core_element_build_phase:
Build Phase
~~~~~~~~~~~
The following methods are the foundation of the element's *build
phase*, they must be implemented by all Element classes, unless
explicitly stated otherwise.
* :func:`Element.configure_sandbox() <buildstream.element.Element.configure_sandbox>`
Configures the :class:`.Sandbox`. This is called before anything else
* :func:`Element.stage() <buildstream.element.Element.stage>`
Stage dependencies and :class:`Sources <buildstream.source.Source>` into
the sandbox.
* :func:`Element.prepare() <buildstream.element.Element.prepare>`
Call preparation methods that should only be performed once in the
lifetime of a build directory (e.g. autotools' ./configure).
**Optional**: If left unimplemented, this step will be skipped.
* :func:`Element.assemble() <buildstream.element.Element.assemble>`
Perform the actual assembly of the element
Miscellaneous
~~~~~~~~~~~~~
Miscellaneous abstract methods also exist:
* :func:`Element.generate_script() <buildstream.element.Element.generate_script>`
For the purpose of ``bst source checkout --include-build-scripts``, an Element may optionally implement this.
Class Reference
---------------
"""
import os
import re
import stat
import copy
import warnings
from collections import OrderedDict
import contextlib
from contextlib import contextmanager, suppress
from functools import partial
from itertools import chain
import string
from typing import cast, TYPE_CHECKING, Any, Dict, Iterator, List, Optional, Set
from pyroaring import BitMap # pylint: disable=no-name-in-module
from ruamel import yaml
from . import _yaml
from ._variables import Variables
from ._versions import BST_CORE_ARTIFACT_VERSION
from ._exceptions import BstError, LoadError, ImplError, SourceCacheError, CachedFailure
from .exceptions import ErrorDomain, LoadErrorReason
from .utils import FileListResult, BST_ARBITRARY_TIMESTAMP
from . import utils
from . import _cachekey
from . import _site
from .node import Node
from .plugin import Plugin
from .sandbox import SandboxFlags, SandboxCommandError
from .sandbox._config import SandboxConfig
from .sandbox._sandboxremote import SandboxRemote
from .types import CoreWarnings, Scope, _CacheBuildTrees, _KeyStrength
from ._artifact import Artifact
from ._elementsources import ElementSources
from ._loader import Symbol, MetaSource
from .storage.directory import Directory
from .storage._filebaseddirectory import FileBasedDirectory
from .storage.directory import VirtualDirectoryError
if TYPE_CHECKING:
from .node import MappingNode, ScalarNode, SequenceNode
from .types import SourceRef
from typing import Tuple
# pylint: disable=cyclic-import
from .sandbox import Sandbox
from .source import Source
from ._context import Context
from ._loader import LoadElement
from ._project import Project
# pylint: enable=cyclic-import
class ElementError(BstError):
"""This exception should be raised by :class:`.Element` implementations
to report errors to the user.
Args:
message: The error message to report to the user
detail: A possibly multiline, more detailed error message
reason: An optional machine readable reason string, used for test cases
collect: An optional directory containing partial install contents
temporary: An indicator to whether the error may occur if the operation was run again.
"""
def __init__(
self, message: str, *, detail: str = None, reason: str = None, collect: str = None, temporary: bool = False
):
super().__init__(message, detail=detail, domain=ErrorDomain.ELEMENT, reason=reason, temporary=temporary)
self.collect = collect
class Element(Plugin):
"""Element()
Base Element class.
All elements derive from this class, this interface defines how
the core will be interacting with Elements.
"""
# The defaults from the yaml file and project
__defaults = None
# A hash of Element by LoadElement
__instantiated_elements = {} # type: Dict[LoadElement, Element]
# A list of (source, ref) tuples which were redundantly specified
__redundant_source_refs = [] # type: List[Tuple[Source, SourceRef]]
BST_ARTIFACT_VERSION = 0
"""The element plugin's artifact version
Elements must first set this to 1 if they change their unique key
structure in a way that would produce a different key for the
same input, or introduce a change in the build output for the
same unique key. Further changes of this nature require bumping the
artifact version.
"""
BST_STRICT_REBUILD = False
"""Whether to rebuild this element in non strict mode if
any of the dependencies have changed.
"""
BST_FORBID_RDEPENDS = False
"""Whether to raise exceptions if an element has runtime dependencies.
"""
BST_FORBID_BDEPENDS = False
"""Whether to raise exceptions if an element has build dependencies.
"""
BST_FORBID_SOURCES = False
"""Whether to raise exceptions if an element has sources.
"""
BST_RUN_COMMANDS = True
"""Whether the element may run commands using Sandbox.run.
"""
BST_ELEMENT_HAS_ARTIFACT = True
"""Whether the element produces an artifact when built.
"""
def __init__(
self, context: "Context", project: "Project", load_element: "LoadElement", plugin_conf: Dict[str, Any]
):
self.__cache_key_dict = None # Dict for cache key calculation
self.__cache_key = None # Our cached cache key
super().__init__(load_element.name, context, project, load_element.provenance, "element")
# Ensure the project is fully loaded here rather than later on
if not load_element.first_pass:
project.ensure_fully_loaded()
self.project_name = self._get_project().name
self.normal_name = _get_normal_name(self.name)
"""A normalized element name
This is the original element without path separators or
the extension, it's used mainly for composing log file names
and creating directory names and such.
"""
# Direct runtime dependency Elements
self.__runtime_dependencies = [] # type: List[Element]
# Direct build dependency Elements
self.__build_dependencies = [] # type: List[Element]
# Direct build dependency subset which require strict rebuilds
self.__strict_dependencies = [] # type: List[Element]
# Direct reverse build dependency Elements
self.__reverse_build_deps = set() # type: Set[Element]
# Direct reverse runtime dependency Elements
self.__reverse_runtime_deps = set() # type: Set[Element]
self.__build_deps_without_strict_cache_key = None # Number of build dependencies without a strict key
self.__runtime_deps_without_strict_cache_key = None # Number of runtime dependencies without a strict key
self.__build_deps_without_cache_key = None # Number of build dependencies without a cache key
self.__runtime_deps_without_cache_key = None # Number of runtime dependencies without a cache key
self.__build_deps_uncached = None # Build dependencies which are not yet cached
self.__runtime_deps_uncached = None # Runtime dependencies which are not yet cached
self.__updated_strict_cache_keys_of_rdeps = False # Whether we've updated strict cache keys of rdeps
self.__ready_for_runtime = False # Whether the element and its runtime dependencies have cache keys
self.__ready_for_runtime_and_cached = False # Whether all runtime deps are cached, as well as the element
self.__cached_remotely = None # Whether the element is cached remotely
self.__sources = ElementSources(context) # The element sources
self.__weak_cache_key = None # Our cached weak cache key
self.__strict_cache_key = None # Our cached cache key for strict builds
self.__artifacts = context.artifactcache # Artifact cache
self.__sourcecache = context.sourcecache # Source cache
self.__assemble_scheduled = False # Element is scheduled to be assembled
self.__assemble_done = False # Element is assembled
self.__pull_done = False # Whether pull was attempted
self.__cached_successfully = None # If the Element is known to be successfully cached
self.__splits = None # Resolved regex objects for computing split domains
self.__whitelist_regex = None # Resolved regex object to check if file is allowed to overlap
self.__tainted = None # Whether the artifact is tainted and should not be shared
self.__required = False # Whether the artifact is required in the current session
self.__artifact_files_required = False # Whether artifact files are required in the local cache
self.__build_result = None # The result of assembling this Element (success, description, detail)
# Artifact class for direct artifact composite interaction
self.__artifact = None # type: Optional[Artifact]
self.__strict_artifact = None # Artifact for strict cache key
self.__batch_prepare_assemble = False # Whether batching across prepare()/assemble() is configured
self.__batch_prepare_assemble_flags = 0 # Sandbox flags for batching across prepare()/assemble()
# Collect dir for batching across prepare()/assemble()
self.__batch_prepare_assemble_collect = None # type: Optional[str]
# Callbacks
self.__required_callback = None # Callback to Queues
self.__can_query_cache_callback = None # Callback to PullQueue/FetchQueue
self.__buildable_callback = None # Callback to BuildQueue
self._depth = None # Depth of Element in its current dependency graph
self.__resolved_initial_state = False # Whether the initial state of the Element has been resolved
# Ensure we have loaded this class's defaults
self.__init_defaults(project, plugin_conf, load_element.kind, load_element.first_pass)
# Collect the composited variables and resolve them
variables = self.__extract_variables(project, load_element)
variables["element-name"] = self.name
self.__variables = Variables(variables)
if not load_element.first_pass:
self.__variables.check()
# Collect the composited environment now that we have variables
unexpanded_env = self.__extract_environment(project, load_element)
self.__variables.expand(unexpanded_env)
self.__environment = unexpanded_env.strip_node_info()
# Collect the environment nocache blacklist list
nocache = self.__extract_env_nocache(project, load_element)
self.__env_nocache = nocache
# Grab public domain data declared for this instance
self.__public = self.__extract_public(load_element)
self.__variables.expand(self.__public)
self.__dynamic_public = None
# Collect the composited element configuration and
# ask the element to configure itself.
self.__config = self.__extract_config(load_element)
self.__variables.expand(self.__config)
self._configure(self.__config)
# Extract remote execution URL
if load_element.first_pass:
self.__remote_execution_specs = None
else:
self.__remote_execution_specs = project.remote_execution_specs
# Extract Sandbox config
sandbox_config = self.__extract_sandbox_config(project, load_element)
self.__variables.expand(sandbox_config)
self.__sandbox_config = SandboxConfig(sandbox_config, context.platform)
def __lt__(self, other):
return self.name < other.name
#############################################################
# Abstract Methods #
#############################################################
def configure_sandbox(self, sandbox: "Sandbox") -> None:
"""Configures the the sandbox for execution
Args:
sandbox: The build sandbox
Raises:
(:class:`.ElementError`): When the element raises an error
Elements must implement this method to configure the sandbox object
for execution.
"""
raise ImplError("element plugin '{kind}' does not implement configure_sandbox()".format(kind=self.get_kind()))
def stage(self, sandbox: "Sandbox") -> None:
"""Stage inputs into the sandbox directories
Args:
sandbox: The build sandbox
Raises:
(:class:`.ElementError`): When the element raises an error
Elements must implement this method to populate the sandbox
directory with data. This is done either by staging :class:`.Source`
objects, by staging the artifacts of the elements this element depends
on, or both.
"""
raise ImplError("element plugin '{kind}' does not implement stage()".format(kind=self.get_kind()))
def prepare(self, sandbox: "Sandbox") -> None:
"""Run one-off preparation commands.
This is run before assemble(), but is guaranteed to run only
the first time if we build incrementally - this makes it
possible to run configure-like commands without causing the
entire element to rebuild.
Args:
sandbox: The build sandbox
Raises:
(:class:`.ElementError`): When the element raises an error
By default, this method does nothing, but may be overriden to
allow configure-like commands.
"""
def assemble(self, sandbox: "Sandbox") -> str:
"""Assemble the output artifact
Args:
sandbox: The build sandbox
Returns:
An absolute path within the sandbox to collect the artifact from
Raises:
(:class:`.ElementError`): When the element raises an error
Elements must implement this method to create an output
artifact from its sources and dependencies.
"""
raise ImplError("element plugin '{kind}' does not implement assemble()".format(kind=self.get_kind()))
def generate_script(self) -> str:
"""Generate a build (sh) script to build this element
Returns:
A string containing the shell commands required to build the element
BuildStream guarantees the following environment when the
generated script is run:
- All element variables have been exported.
- The cwd is `self.get_variable('build-root')/self.normal_name`.
- $PREFIX is set to `self.get_variable('install-root')`.
- The directory indicated by $PREFIX is an empty directory.
Files are expected to be installed to $PREFIX.
If the script fails, it is expected to return with an exit
code != 0.
"""
raise ImplError("element plugin '{kind}' does not implement write_script()".format(kind=self.get_kind()))
#############################################################
# Public Methods #
#############################################################
def sources(self) -> Iterator["Source"]:
"""A generator function to enumerate the element sources
Yields:
The sources of this element
"""
return self.__sources.sources()
def dependencies(self, scope: Scope, *, recurse: bool = True, visited=None) -> Iterator["Element"]:
"""dependencies(scope, *, recurse=True)
A generator function which yields the dependencies of the given element.
If `recurse` is specified (the default), the full dependencies will be listed
in deterministic staging order, starting with the basemost elements in the
given `scope`. Otherwise, if `recurse` is not specified then only the direct
dependencies in the given `scope` will be traversed, and the element itself
will be omitted.
Args:
scope: The scope to iterate in
recurse: Whether to recurse
Yields:
The dependencies in `scope`, in deterministic staging order
"""
# The format of visited is (BitMap(), BitMap()), with the first BitMap
# containing element that have been visited for the `Scope.BUILD` case
# and the second one relating to the `Scope.RUN` case.
if not recurse:
result: Set[Element] = set()
if scope in (Scope.BUILD, Scope.ALL):
for dep in self.__build_dependencies:
if dep not in result:
result.add(dep)
yield dep
if scope in (Scope.RUN, Scope.ALL):
for dep in self.__runtime_dependencies:
if dep not in result:
result.add(dep)
yield dep
else:
def visit(element, scope, visited):
if scope == Scope.ALL:
visited[0].add(element._unique_id)
visited[1].add(element._unique_id)
for dep in chain(element.__build_dependencies, element.__runtime_dependencies):
if dep._unique_id not in visited[0] and dep._unique_id not in visited[1]:
yield from visit(dep, Scope.ALL, visited)
yield element
elif scope == Scope.BUILD:
visited[0].add(element._unique_id)
for dep in element.__build_dependencies:
if dep._unique_id not in visited[1]:
yield from visit(dep, Scope.RUN, visited)
elif scope == Scope.RUN:
visited[1].add(element._unique_id)
for dep in element.__runtime_dependencies:
if dep._unique_id not in visited[1]:
yield from visit(dep, Scope.RUN, visited)
yield element
else:
yield element
if visited is None:
# Visited is of the form (Visited for Scope.BUILD, Visited for Scope.RUN)
visited = (BitMap(), BitMap())
else:
# We have already a visited set passed. we might be able to short-circuit
if scope in (Scope.BUILD, Scope.ALL) and self._unique_id in visited[0]:
return
if scope in (Scope.RUN, Scope.ALL) and self._unique_id in visited[1]:
return
yield from visit(self, scope, visited)
def search(self, scope: Scope, name: str) -> Optional["Element"]:
"""Search for a dependency by name
Args:
scope: The scope to search
name: The dependency to search for
Returns:
The dependency element, or None if not found.
"""
for dep in self.dependencies(scope):
if dep.name == name:
return dep
return None
def node_subst_vars(self, node: "ScalarNode") -> str:
"""Replace any variables in the string contained in the node and returns it.
**Warning**: The method is deprecated and will get removed in the next version
Args:
node: A ScalarNode loaded from YAML
Returns:
The value with all variables replaced
Raises:
:class:`.LoadError`: When the node doesn't contain a string or a variable was not found.
**Example:**
.. code:: python
# Expect a string 'name' in 'node', substituting any
# variables in the returned string
name = self.node_subst_vars(node.get_scalar('name'))
"""
# FIXME: remove this
warnings.warn(
"configuration is now automatically expanded, this is a no-op and will be removed.", DeprecationWarning
)
return node.as_str()
def node_subst_sequence_vars(self, node: "SequenceNode[ScalarNode]") -> List[str]:
"""Substitute any variables in the given sequence
**Warning**: The method is deprecated and will get removed in the next version
Args:
node: A SequenceNode loaded from YAML
Returns:
The list with every variable replaced
Raises:
:class:`.LoadError`
"""
# FIXME: remove this
warnings.warn(
"configuration is now automatically expanded, this is a no-op and will be removed.", DeprecationWarning
)
return node.as_str_list()
def compute_manifest(
self, *, include: Optional[List[str]] = None, exclude: Optional[List[str]] = None, orphans: bool = True
) -> str:
"""Compute and return this element's selective manifest
The manifest consists on the list of file paths in the
artifact. The files in the manifest are selected according to
`include`, `exclude` and `orphans` parameters. If `include` is
not specified then all files spoken for by any domain are
included unless explicitly excluded with an `exclude` domain.
Args:
include: An optional list of domains to include files from
exclude: An optional list of domains to exclude files from
orphans: Whether to include files not spoken for by split domains
Yields:
The paths of the files in manifest
"""
self.__assert_cached()
return self.__compute_splits(include, exclude, orphans)
def get_artifact_name(self, key: Optional[str] = None) -> str:
"""Compute and return this element's full artifact name
Generate a full name for an artifact, including the project
namespace, element name and cache key.
This can also be used as a relative path safely, and
will normalize parts of the element name such that only
digits, letters and some select characters are allowed.
Args:
key: The element's cache key. Defaults to None
Returns:
The relative path for the artifact
"""
if key is None:
key = self._get_cache_key()
assert key is not None
return _compose_artifact_name(self.project_name, self.normal_name, key)
def stage_artifact(
self,
sandbox: "Sandbox",
*,
path: str = None,
include: Optional[List[str]] = None,
exclude: Optional[List[str]] = None,
orphans: bool = True
) -> FileListResult:
"""Stage this element's output artifact in the sandbox
This will stage the files from the artifact to the sandbox at specified location.
The files are selected for staging according to the `include`, `exclude` and `orphans`
parameters; if `include` is not specified then all files spoken for by any domain
are included unless explicitly excluded with an `exclude` domain.
Args:
sandbox: The build sandbox
path: An optional sandbox relative path
include: An optional list of domains to include files from
exclude: An optional list of domains to exclude files from
orphans: Whether to include files not spoken for by split domains
Raises:
(:class:`.ElementError`): If the element has not yet produced an artifact.
Returns:
The result describing what happened while staging
.. note::
Directories in `dest` are replaced with files from `src`,
unless the existing directory in `dest` is not empty in
which case the path will be reported in the return value.
**Example:**
.. code:: python
# Stage the dependencies for a build of 'self'
for dep in self.dependencies(Scope.BUILD):
dep.stage_artifact(sandbox)
"""
if not self._cached():
detail = (
"No artifacts have been cached yet for that element\n"
+ "Try building the element first with `bst build`\n"
)
raise ElementError("No artifacts to stage", detail=detail, reason="uncached-checkout-attempt")
# Time to use the artifact, check once more that it's there
self.__assert_cached()
self.status("Staging {}/{}".format(self.name, self._get_brief_display_key()))
# Disable type checking since we can't easily tell mypy that
# `self.__artifact` can't be None at this stage.
files_vdir = self.__artifact.get_files() # type: ignore
# Hard link it into the staging area
#
vbasedir = sandbox.get_virtual_directory()
vstagedir = vbasedir if path is None else vbasedir.descend(*path.lstrip(os.sep).split(os.sep), create=True)
split_filter = self.__split_filter_func(include, exclude, orphans)
result = vstagedir.import_files(files_vdir, filter_callback=split_filter, report_written=True, can_link=True)
return result
def stage_dependency_artifacts(
self,
sandbox: "Sandbox",
scope: Scope,
*,
path: str = None,
include: Optional[List[str]] = None,
exclude: Optional[List[str]] = None,
orphans: bool = True
) -> None:
"""Stage element dependencies in scope
This is primarily a convenience wrapper around
:func:`Element.stage_artifact() <buildstream.element.Element.stage_artifact>`
which takes care of staging all the dependencies in `scope` and issueing the
appropriate warnings.
Args:
sandbox: The build sandbox
scope: The scope to stage dependencies in
path An optional sandbox relative path
include: An optional list of domains to include files from
exclude: An optional list of domains to exclude files from
orphans: Whether to include files not spoken for by split domains
Raises:
(:class:`.ElementError`): If any of the dependencies in `scope` have not
yet produced artifacts, or if forbidden overlaps
occur.
"""
ignored = {}
overlaps = OrderedDict() # type: OrderedDict[str, List[str]]
files_written = {} # type: Dict[str, List[str]]
for dep in self.dependencies(scope):
result = dep.stage_artifact(sandbox, path=path, include=include, exclude=exclude, orphans=orphans)
if result.overwritten:
for overwrite in result.overwritten:
# Completely new overwrite
if overwrite not in overlaps:
# Find the overwritten element by checking where we've
# written the element before
for elm, contents in files_written.items():
if overwrite in contents:
overlaps[overwrite] = [elm, dep.name]
else:
overlaps[overwrite].append(dep.name)
files_written[dep.name] = result.files_written
if result.ignored:
ignored[dep.name] = result.ignored
if overlaps:
overlap_warning = False
warning_detail = "Staged files overwrite existing files in staging area:\n"
for f, elements in overlaps.items():
overlap_warning_elements = []
# The bottom item overlaps nothing
overlapping_elements = elements[1:]
for elm in overlapping_elements:
element = cast(Element, self.search(scope, elm))
if not element.__file_is_whitelisted(f):
overlap_warning_elements.append(elm)
overlap_warning = True
warning_detail += _overlap_error_detail(f, overlap_warning_elements, elements)
if overlap_warning:
self.warn(
"Non-whitelisted overlaps detected", detail=warning_detail, warning_token=CoreWarnings.OVERLAPS
)
if ignored:
detail = "Not staging files which would replace non-empty directories:\n"
for key, value in ignored.items():
detail += "\nFrom {}:\n".format(key)
detail += " " + " ".join(["/" + f + "\n" for f in value])
self.warn("Ignored files", detail=detail)
def integrate(self, sandbox: "Sandbox") -> None:
"""Integrate currently staged filesystem against this artifact.
Args:
sandbox: The build sandbox
This modifies the sysroot staged inside the sandbox so that
the sysroot is *integrated*. Only an *integrated* sandbox
may be trusted for running the software therein, as the integration
commands will create and update important system cache files
required for running the installed software (such as the ld.so.cache).
"""
bstdata = self.get_public_data("bst")
environment = self.get_environment()
if bstdata is not None:
with sandbox.batch(SandboxFlags.NONE):
for command in bstdata.get_str_list("integration-commands", []):
sandbox.run(["sh", "-e", "-c", command], 0, env=environment, cwd="/", label=command)
def stage_sources(self, sandbox: "Sandbox", directory: str) -> None:
"""Stage this element's sources to a directory in the sandbox
Args:
sandbox: The build sandbox
directory: An absolute path within the sandbox to stage the sources at
"""
self._stage_sources_in_sandbox(sandbox, directory)
def get_public_data(self, domain: str) -> "MappingNode[Any, Any]":
"""Fetch public data on this element
Args:
domain: A public domain name to fetch data for
Returns:
.. note::
This can only be called the abstract methods which are
called as a part of the :ref:`build phase <core_element_build_phase>`
and never before.
"""
if self.__dynamic_public is None:
self.__load_public_data()
# Disable type-checking since we can't easily tell mypy that
# `self.__dynamic_public` can't be None here.
data = self.__dynamic_public.get_mapping(domain, default=None) # type: ignore
if data is not None:
data = data.clone()
return data
def set_public_data(self, domain: str, data: "MappingNode[Any, Any]") -> None:
"""Set public data on this element
Args:
domain: A public domain name to fetch data for
data: The public data dictionary for the given domain
This allows an element to dynamically mutate public data of
elements or add new domains as the result of success completion
of the :func:`Element.assemble() <buildstream.element.Element.assemble>`
method.
"""
if self.__dynamic_public is None:
self.__load_public_data()
if data is not None:
data = data.clone()
self.__dynamic_public[domain] = data # type: ignore
def get_environment(self) -> Dict[str, str]:
"""Fetch the environment suitable for running in the sandbox
Returns:
A dictionary of string key/values suitable for passing
to :func:`Sandbox.run() <buildstream.sandbox.Sandbox.run>`
"""
return self.__environment
def get_variable(self, varname: str) -> Optional[str]:
"""Fetch the value of a variable resolved for this element.
Args:
varname: The name of the variable to fetch
Returns:
The resolved value for *varname*, or None if no
variable was declared with the given name.
"""
# Flat is not recognized correctly by Pylint as being a dictionary
return self.__variables.get(varname) # pylint: disable=no-member
def batch_prepare_assemble(self, flags: int, *, collect: Optional[str] = None) -> None:
""" Configure command batching across prepare() and assemble()
Args:
flags: The sandbox flags for the command batch
collect: An optional directory containing partial install contents
on command failure.
This may be called in :func:`Element.configure_sandbox() <buildstream.element.Element.configure_sandbox>`
to enable batching of all sandbox commands issued in prepare() and assemble().
"""
if self.__batch_prepare_assemble:
raise ElementError("{}: Command batching for prepare/assemble is already configured".format(self))
self.__batch_prepare_assemble = True
self.__batch_prepare_assemble_flags = flags
self.__batch_prepare_assemble_collect = collect
def get_logs(self) -> List[str]:
"""Obtain a list of log file paths
Returns:
A list of log file paths
"""
return cast(Artifact, self.__artifact).get_logs()
#############################################################
# Private Methods used in BuildStream #
#############################################################
# _new_from_load_element():
#
# Recursively instantiate a new Element instance, its sources
# and its dependencies from a LoadElement.
#
# FIXME: Need to use an iterative algorithm here since recursion
# will limit project dependency depth.
#
# Args:
# load_element (LoadElement): The LoadElement
# task (Task): A task object to report progress to
#
# Returns:
# (Element): A newly created Element instance
#
@classmethod
def _new_from_load_element(cls, load_element, task=None):
if not load_element.first_pass:
load_element.project.ensure_fully_loaded()
with suppress(KeyError):
return cls.__instantiated_elements[load_element]
element = load_element.project.create_element(load_element)
cls.__instantiated_elements[load_element] = element
# Load the sources from the LoadElement
element.__load_sources(load_element)
# Instantiate dependencies
for dep in load_element.dependencies:
dependency = Element._new_from_load_element(dep.element, task)
if dep.dep_type != "runtime":
element.__build_dependencies.append(dependency)
dependency.__reverse_build_deps.add(element)
if dep.dep_type != "build":
element.__runtime_dependencies.append(dependency)
dependency.__reverse_runtime_deps.add(element)
if dep.strict:
element.__strict_dependencies.append(dependency)
no_of_runtime_deps = len(element.__runtime_dependencies)
element.__runtime_deps_without_strict_cache_key = no_of_runtime_deps
element.__runtime_deps_without_cache_key = no_of_runtime_deps
element.__runtime_deps_uncached = no_of_runtime_deps
no_of_build_deps = len(element.__build_dependencies)
element.__build_deps_without_strict_cache_key = no_of_build_deps
element.__build_deps_without_cache_key = no_of_build_deps
element.__build_deps_uncached = no_of_build_deps
element.__preflight()
if task:
task.add_current_progress()
return element
# _clear_meta_elements_cache()
#
# Clear the internal meta elements cache.
#
# When loading elements from meta, we cache already instantiated elements
# in order to not have to load the same elements twice.
# This clears the cache.
#
# It should be called whenever we are done loading all elements in order
# to save memory.
#
@classmethod
def _clear_meta_elements_cache(cls):
cls.__instantiated_elements = {}
# _get_redundant_source_refs()
#
# Fetches a list of (Source, ref) tuples of all the Sources
# which were loaded with a ref specified in the element declaration
# for projects which use project.refs ref-storage.
#
# This is used to produce a warning
@classmethod
def _get_redundant_source_refs(cls):
return cls.__redundant_source_refs
# _reset_load_state()
#
# This is called by Pipeline.cleanup() and is used to
# reset the loader state between multiple sessions.
#
@classmethod
def _reset_load_state(cls):
cls.__instantiated_elements = {}
cls.__redundant_source_refs = []
# _cached():
#
# Returns:
# (bool): Whether this element is already present in
# the artifact cache
#
def _cached(self):
if not self.__artifact:
return False
return self.__artifact.cached()
# _cached_remotely():
#
# Returns:
# (bool): Whether this element is present in a remote cache
#
def _cached_remotely(self):
if self.__cached_remotely is None:
self.__cached_remotely = self.__artifacts.check_remotes_for_element(self)
return self.__cached_remotely
# _get_build_result():
#
# Returns:
# (bool): Whether the artifact of this element present in the artifact cache is of a success
# (str): Short description of the result
# (str): Detailed description of the result
#
def _get_build_result(self):
if self.__build_result is None:
self.__load_build_result()
return self.__build_result
# __set_build_result():
#
# Sets the assembly result
#
# Args:
# success (bool): Whether the result is a success
# description (str): Short description of the result
# detail (str): Detailed description of the result
#
def __set_build_result(self, success, description, detail=None):
self.__build_result = (success, description, detail)
# _cached_success():
#
# Returns:
# (bool): Whether this element is already present in
# the artifact cache and the element assembled successfully
#
def _cached_success(self):
# FIXME: _cache() and _cached_success() should be converted to
# push based functions where we only update __cached_successfully
# once we know this has changed. This will allow us to cheaply check
# __cached_successfully instead of calling _cached_success()
if self.__cached_successfully:
return True
if not self._cached():
return False
success, _, _ = self._get_build_result()
if success:
self.__cached_successfully = True
return True
else:
return False
# _cached_failure():
#
# Returns:
# (bool): Whether this element is already present in
# the artifact cache and the element did not assemble successfully
#
def _cached_failure(self):
if not self._cached():
return False
success, _, _ = self._get_build_result()
return not success
# _buildable():
#
# Returns:
# (bool): Whether this element can currently be built
#
def _buildable(self):
if self._fetch_needed():
return False
if not self.__assemble_scheduled:
return False
return self.__build_deps_uncached == 0
# _get_cache_key():
#
# Returns the cache key
#
# Args:
# strength (_KeyStrength): Either STRONG or WEAK key strength
#
# Returns:
# (str): A hex digest cache key for this Element, or None
#
# None is returned if information for the cache key is missing.
#
def _get_cache_key(self, strength=_KeyStrength.STRONG):
if strength == _KeyStrength.STRONG:
return self.__cache_key
else:
return self.__weak_cache_key
# _can_query_cache():
#
# Returns whether the cache key required for cache queries is available.
#
# Returns:
# (bool): True if cache can be queried
#
def _can_query_cache(self):
# cache cannot be queried until strict cache key is available
return self.__strict_cache_key is not None
# _initialize_state()
#
# Compute up the elment's initial state. Element state contains
# the following mutable sub-states:
#
# - Source state in `ElementSources`
# - Artifact cache key
# - Source key in `ElementSources`
# - Integral component of the cache key
# - Computed as part of the source state
# - Artifact state
# - Cache key
# - Must be known to compute this state
# - Build status
# - Artifact state
# - Must be known before we can decide whether to build
#
# Note that sub-states are dependent on each other, and changes to
# one state will effect changes in the next.
#
# Changes to these states can be caused by numerous things,
# notably jobs executed in sub-processes. Changes are performed by
# invocations of the following methods:
#
# - __update_cache_keys()
# - Computes the strong and weak cache keys.
# - _update_artifact_state()
# - Computes the state of the element's artifact using the
# cache key.
# - __schedule_assembly_when_necessary()
# - Schedules assembly of an element, iff its current state
# allows/necessitates it
# - __update_cache_key_non_strict()
# - Sets strict cache keys in non-strict builds
# - Some non-strict build actions can create artifacts
# compatible with strict mode (such as pulling), so
# this needs to be done
#
# When any one of these methods are called and cause a change,
# they will invoke methods that have a potential dependency on
# them, causing the state change to bubble through all potential
# side effects.
#
# After initializing the source state via `ElementSources`,
# *this* method starts the process by invoking
# `__update_cache_keys()`, which will cause all necessary state
# changes. Other functions should use the appropriate methods and
# only update what they expect to change - this will ensure that
# the minimum amount of work is done.
#
def _initialize_state(self):
if self.__resolved_initial_state:
return
self.__resolved_initial_state = True
# This will initialize source state.
self.__sources.update_resolved_state()
# This will calculate the cache keys, and for un-initialized
# elements recursively initialize anything else (because it
# will become considered outdated after cache keys are
# updated).
#
# FIXME: Currently this method may cause recursion through
# `self.__update_strict_cache_key_of_rdeps()`, since this may
# invoke reverse dependencies' cache key updates
# recursively. This is necessary when we update keys after a
# pull/build, however should not occur during initialization
# (since we will eventualyl visit reverse dependencies during
# our initialization anyway).
self.__update_cache_keys()
# _get_display_key():
#
# Returns cache keys for display purposes
#
# Returns:
# (str): A full hex digest cache key for this Element
# (str): An abbreviated hex digest cache key for this Element
# (bool): True if key should be shown as dim, False otherwise
#
# Question marks are returned if information for the cache key is missing.
#
def _get_display_key(self):
context = self._get_context()
dim_key = True
cache_key = self._get_cache_key()
if not cache_key:
cache_key = "{:?<64}".format("")
elif cache_key == self.__strict_cache_key:
# Strong cache key used in this session matches cache key
# that would be used in strict build mode
dim_key = False
length = min(len(cache_key), context.log_key_length)
return (cache_key, cache_key[0:length], dim_key)
# _get_brief_display_key()
#
# Returns an abbreviated cache key for display purposes
#
# Returns:
# (str): An abbreviated hex digest cache key for this Element
#
# Question marks are returned if information for the cache key is missing.
#
def _get_brief_display_key(self):
_, display_key, _ = self._get_display_key()
return display_key
# _tracking_done():
#
# This is called in the main process after the element has been tracked
#
def _tracking_done(self):
# Tracking may change the sources' refs, and therefore the
# source state. We need to update source state.
self.__sources.update_resolved_state()
self.__update_cache_keys()
# _track():
#
# Calls track() on the Element sources
#
# Raises:
# SourceError: If one of the element sources has an error
#
# Returns:
# (list): A list of Source object ids and their new references
#
def _track(self):
return self.__sources.track(self._get_workspace())
# _prepare_sandbox():
#
# This stages things for either _shell() (below) or also
# is used to stage things by the `bst artifact checkout` codepath
#
@contextmanager
def _prepare_sandbox(self, scope, shell=False, integrate=True, usebuildtree=False):
# bst shell and bst artifact checkout require a local sandbox.
with self.__sandbox(None, config=self.__sandbox_config, allow_remote=False) as sandbox:
sandbox._usebuildtree = usebuildtree
# Configure always comes first, and we need it.
self.__configure_sandbox(sandbox)
# Stage what we need
if shell and scope == Scope.BUILD:
self.stage(sandbox)
else:
# Stage deps in the sandbox root
with self.timed_activity("Staging dependencies", silent_nested=True):
self.stage_dependency_artifacts(sandbox, scope)
# Run any integration commands provided by the dependencies
# once they are all staged and ready
if integrate:
with self.timed_activity("Integrating sandbox"):
for dep in self.dependencies(scope):
dep.integrate(sandbox)
yield sandbox
# _stage_sources_in_sandbox():
#
# Stage this element's sources to a directory inside sandbox
#
# Args:
# sandbox (:class:`.Sandbox`): The build sandbox
# directory (str): An absolute path to stage the sources at
#
def _stage_sources_in_sandbox(self, sandbox, directory):
# Stage all sources that need to be copied
sandbox_vroot = sandbox.get_virtual_directory()
host_vdirectory = sandbox_vroot.descend(*directory.lstrip(os.sep).split(os.sep), create=True)
self._stage_sources_at(host_vdirectory, usebuildtree=sandbox._usebuildtree)
# _stage_sources_at():
#
# Stage this element's sources to a directory
#
# Args:
# vdirectory (:class:`.storage.Directory`): A virtual directory object to stage sources into.
# usebuildtree (bool): use a the elements build tree as its source.
#
def _stage_sources_at(self, vdirectory, usebuildtree=False):
context = self._get_context()
# It's advantageous to have this temporary directory on
# the same file system as the rest of our cache.
with self.timed_activity("Staging sources", silent_nested=True), utils._tempdir(
dir=context.tmpdir, prefix="staging-temp"
) as temp_staging_directory:
import_dir = temp_staging_directory
if not isinstance(vdirectory, Directory):
vdirectory = FileBasedDirectory(vdirectory)
if not vdirectory.is_empty():
raise ElementError("Staging directory '{}' is not empty".format(vdirectory))
# Check if we have a cached buildtree to use
if usebuildtree:
import_dir = self.__artifact.get_buildtree()
if import_dir.is_empty():
detail = "Element type either does not expect a buildtree or it was explictily cached without one."
self.warn("WARNING: {} Artifact contains an empty buildtree".format(self.name), detail=detail)
# No cached buildtree, stage source from source cache
else:
try:
staged_sources = self.__sources.stage()
except (SourceCacheError, VirtualDirectoryError) as e:
raise ElementError(
"Error trying to stage sources for {}: {}".format(self.name, e), reason="stage-sources-fail"
)
# incremental builds should merge the source into the last artifact before staging
last_build_artifact = self.__get_last_build_artifact()
if last_build_artifact:
self.info("Incremental build")
last_sources = last_build_artifact.get_sources()
import_dir = last_build_artifact.get_buildtree()
import_dir._apply_changes(last_sources, staged_sources)
else:
import_dir = staged_sources
# Set update_mtime to ensure deterministic mtime of sources at build time
with utils._deterministic_umask():
vdirectory.import_files(import_dir, update_mtime=BST_ARBITRARY_TIMESTAMP)
# Ensure deterministic owners of sources at build time
vdirectory.set_deterministic_user()
# _set_required():
#
# Mark this element and its runtime dependencies as required.
# This unblocks pull/fetch/build.
#
def _set_required(self):
if self.__required:
# Already done
return
self.__required = True
# Request artifacts of runtime dependencies
for dep in self.dependencies(Scope.RUN, recurse=False):
dep._set_required()
# When an element becomes required, it must be assembled for
# the current pipeline. `__schedule_assembly_when_necessary()`
# will abort if some other state prevents it from being built,
# and changes to such states will cause re-scheduling, so this
# is safe.
self.__schedule_assembly_when_necessary()
# Callback to the Queue
if self.__required_callback is not None:
self.__required_callback(self)
self.__required_callback = None
# _is_required():
#
# Returns whether this element has been marked as required.
#
def _is_required(self):
return self.__required
# _set_artifact_files_required():
#
# Mark artifact files for this element and its runtime dependencies as
# required in the local cache.
#
def _set_artifact_files_required(self, scope=Scope.RUN):
if self.__artifact_files_required:
# Already done
return
self.__artifact_files_required = True
# Request artifact files of runtime dependencies
for dep in self.dependencies(scope, recurse=False):
dep._set_artifact_files_required(scope=scope)
# _artifact_files_required():
#
# Returns whether artifact files for this element have been marked as required.
#
def _artifact_files_required(self):
return self.__artifact_files_required
# __should_schedule()
#
# Returns:
# bool - Whether the element can be scheduled for a build.
#
def __should_schedule(self):
# We're processing if we're already scheduled, we've
# finished assembling or if we're waiting to pull.
processing = self.__assemble_scheduled or self.__assemble_done or self._pull_pending()
# We should schedule a build when
return (
# We're not processing
not processing
and
# We're required for the current build
self._is_required()
and
# We have figured out the state of our artifact
self.__artifact
and
# And we're not cached yet
not self._cached_success()
)
# __schedule_assembly_when_necessary():
#
# This is called in the main process before the element is assembled
# in a subprocess.
#
def __schedule_assembly_when_necessary(self):
# FIXME: We could reduce the number of function calls a bit by
# factoring this out of this method (and checking whether we
# should schedule at the calling end).
#
# This would make the code less pretty, but it's a possible
# optimization if we get desperate enough (and we will ;)).
if not self.__should_schedule():
return
self.__assemble_scheduled = True
# Requests artifacts of build dependencies
for dep in self.dependencies(Scope.BUILD, recurse=False):
dep._set_required()
# Once we schedule an element for assembly, we know that our
# build dependencies have strong cache keys, so we can update
# our own strong cache key.
self.__update_cache_key_non_strict()
# _assemble_done():
#
# This is called in the main process after the element has been assembled.
#
# This will result in updating the element state.
#
# Args:
# successful (bool): Whether the build was successful
#
def _assemble_done(self, successful):
assert self.__assemble_scheduled
self.__assemble_done = True
self.__strict_artifact.reset_cached()
if successful:
# Directly set known cached status as optimization to avoid
# querying buildbox-casd and the filesystem.
self.__artifact.set_cached()
self.__cached_successfully = True
else:
self.__artifact.reset_cached()
# When we're building in non-strict mode, we may have
# assembled everything to this point without a strong cache
# key. Once the element has been assembled, a strong cache key
# can be set, so we do so.
self.__update_cache_key_non_strict()
self._update_ready_for_runtime_and_cached()
if self._get_workspace() and self._cached():
assert utils._is_main_process(), "Attempted to save workspace configuration from child process"
#
# Note that this block can only happen in the
# main process, since `self._cached_success()` cannot
# be true when assembly is successful in the task.
#
# For this reason, it is safe to update and
# save the workspaces configuration
#
key = self._get_cache_key()
workspace = self._get_workspace()
workspace.last_build = key
self._get_context().get_workspaces().save_config()
# _assemble():
#
# Internal method for running the entire build phase.
#
# This will:
# - Prepare a sandbox for the build
# - Call the public abstract methods for the build phase
# - Cache the resulting artifact
#
# Returns:
# (int): The size of the newly cached artifact
#
def _assemble(self):
# Only do this the first time around (i.e. __assemble_done is False)
# to allow for retrying the job
if self._cached_failure() and not self.__assemble_done:
with self._output_file() as output_file:
for log_path in self.__artifact.get_logs():
with open(log_path) as log_file:
output_file.write(log_file.read())
_, description, detail = self._get_build_result()
e = CachedFailure(description, detail=detail)
# Shelling into a sandbox is useful to debug this error
e.sandbox = True
raise e
# Assert call ordering
assert not self._cached_success()
# Print the environment at the beginning of the log file.
env_dump = yaml.round_trip_dump(self.get_environment(), default_flow_style=False, allow_unicode=True)
self.log("Build environment for element {}".format(self.name), detail=env_dump)
context = self._get_context()
with self._output_file() as output_file:
# Explicitly clean it up, keep the build dir around if exceptions are raised
os.makedirs(context.builddir, exist_ok=True)
with utils._tempdir(
prefix="{}-".format(self.normal_name), dir=context.builddir
) as rootdir, self.__sandbox(
rootdir, output_file, output_file, self.__sandbox_config
) as sandbox: # noqa
# Let the sandbox know whether the buildtree will be required.
# This allows the remote execution sandbox to skip buildtree
# download when it's not needed.
buildroot = self.get_variable("build-root")
cache_buildtrees = context.cache_buildtrees
if cache_buildtrees != _CacheBuildTrees.NEVER:
always_cache_buildtrees = cache_buildtrees == _CacheBuildTrees.ALWAYS
sandbox._set_build_directory(buildroot, always=always_cache_buildtrees)
if not self.BST_RUN_COMMANDS:
# Element doesn't need to run any commands in the sandbox.
#
# Disable Sandbox.run() to allow CasBasedDirectory for all
# sandboxes.
sandbox._disable_run()
# By default, the dynamic public data is the same as the static public data.
# The plugin's assemble() method may modify this, though.
self.__dynamic_public = self.__public.clone()
# Call the abstract plugin methods
# Step 1 - Configure
self.__configure_sandbox(sandbox)
# Step 2 - Stage
self.stage(sandbox)
try:
if self.__batch_prepare_assemble:
cm = sandbox.batch(
self.__batch_prepare_assemble_flags, collect=self.__batch_prepare_assemble_collect
)
else:
cm = contextlib.suppress()
with cm:
# Step 3 - Prepare
self.__prepare(sandbox)
# Step 4 - Assemble
collect = self.assemble(sandbox) # pylint: disable=assignment-from-no-return
self.__set_build_result(success=True, description="succeeded")
except (ElementError, SandboxCommandError) as e:
# Shelling into a sandbox is useful to debug this error
e.sandbox = True
self.__set_build_result(success=False, description=str(e), detail=e.detail)
self._cache_artifact(sandbox, e.collect)
raise
else:
return self._cache_artifact(sandbox, collect)
def _cache_artifact(self, sandbox, collect):
context = self._get_context()
buildresult = self.__build_result
publicdata = self.__dynamic_public
sandbox_vroot = sandbox.get_virtual_directory()
collectvdir = None
sandbox_build_dir = None
sourcesvdir = None
cache_buildtrees = context.cache_buildtrees
build_success = buildresult[0]
# cache_buildtrees defaults to 'auto', only caching buildtrees
# when necessary, which includes failed builds.
# If only caching failed artifact buildtrees, then query the build
# result. Element types without a build-root dir will be cached
# with an empty buildtreedir regardless of this configuration.
if cache_buildtrees == _CacheBuildTrees.ALWAYS or (
cache_buildtrees == _CacheBuildTrees.AUTO and (not build_success or self._get_workspace())
):
try:
sandbox_build_dir = sandbox_vroot.descend(
*self.get_variable("build-root").lstrip(os.sep).split(os.sep)
)
sandbox._fetch_missing_blobs(sandbox_build_dir)
except VirtualDirectoryError:
# Directory could not be found. Pre-virtual
# directory behaviour was to continue silently
# if the directory could not be found.
pass
sourcesvdir = self.__sources.vdir
if collect is not None:
try:
collectvdir = sandbox_vroot.descend(*collect.lstrip(os.sep).split(os.sep))
sandbox._fetch_missing_blobs(collectvdir)
except VirtualDirectoryError:
pass
# ensure we have cache keys
self.__update_cache_key_non_strict()
with self.timed_activity("Caching artifact"):
artifact_size = self.__artifact.cache(sandbox_build_dir, collectvdir, sourcesvdir, buildresult, publicdata)
if collect is not None and collectvdir is None:
raise ElementError(
"Directory '{}' was not found inside the sandbox, "
"unable to collect artifact contents".format(collect)
)
return artifact_size
# _fetch_done()
#
# Indicates that fetching the sources for this element has been done.
#
# Args:
# fetched_original (bool): Whether the original sources had been asked (and fetched) or not
#
def _fetch_done(self, fetched_original):
self.__sources.fetch_done(fetched_original)
# _pull_pending()
#
# Check whether the artifact will be pulled. If the pull operation is to
# include a specific subdir of the element artifact (from cli or user conf)
# then the local cache is queried for the subdirs existence.
#
# Returns:
# (bool): Whether a pull operation is pending
#
def _pull_pending(self):
if self._get_workspace():
# Workspace builds are never pushed to artifact servers
return False
# Check whether the pull has been invoked with a specific subdir requested
# in user context, as to complete a partial artifact
pull_buildtrees = self._get_context().pull_buildtrees
if self.__strict_artifact:
if self.__strict_artifact.cached() and pull_buildtrees:
# If we've specified a subdir, check if the subdir is cached locally
# or if it's possible to get
if self._cached_buildtree() or not self._buildtree_exists():
return False
elif self.__strict_artifact.cached():
return False
# Pull is pending if artifact remote server available
# and pull has not been attempted yet
return self.__artifacts.has_fetch_remotes(plugin=self) and not self.__pull_done
# _pull_done()
#
# Indicate that pull was attempted.
#
# This needs to be called in the main process after a pull
# succeeds or fails so that we properly update the main
# process data model
#
# This will result in updating the element state.
#
def _pull_done(self):
self.__pull_done = True
# Artifact may become cached after pulling, so let it query the
# filesystem again to check
self.__strict_artifact.reset_cached()
self.__artifact.reset_cached()
# We may not have actually pulled an artifact - the pull may
# have failed. We might therefore need to schedule assembly.
self.__schedule_assembly_when_necessary()
# If we've finished pulling, an artifact might now exist
# locally, so we might need to update a non-strict strong
# cache key.
self.__update_cache_key_non_strict()
self._update_ready_for_runtime_and_cached()
# _pull():
#
# Pull artifact from remote artifact repository into local artifact cache.
#
# Returns: True if the artifact has been downloaded, False otherwise
#
def _pull(self):
context = self._get_context()
# Get optional specific subdir to pull and optional list to not pull
# based off of user context
pull_buildtrees = context.pull_buildtrees
# Attempt to pull artifact without knowing whether it's available
pulled = self.__pull_strong(pull_buildtrees=pull_buildtrees)
if not pulled and not self._cached() and not context.get_strict():
pulled = self.__pull_weak(pull_buildtrees=pull_buildtrees)
if not pulled:
return False
# Notify successfull download
return True
def _skip_source_push(self):
if not self.sources() or self._get_workspace():
return True
return not (self.__sourcecache.has_push_remotes(plugin=self) and self._has_all_sources_in_source_cache())
def _source_push(self):
return self.__sources.push()
# _skip_push():
#
# Determine whether we should create a push job for this element.
#
# Returns:
# (bool): True if this element does not need a push job to be created
#
def _skip_push(self):
if not self.__artifacts.has_push_remotes(plugin=self):
# No push remotes for this element's project
return True
# Do not push elements that aren't cached, or that are cached with a dangling buildtree
# ref unless element type is expected to have an an empty buildtree directory
if not self._cached_buildtree() and self._buildtree_exists():
return True
# Do not push tainted artifact
if self.__get_tainted():
return True
return False
# _push():
#
# Push locally cached artifact to remote artifact repository.
#
# Returns:
# (bool): True if the remote was updated, False if it already existed
# and no updated was required
#
def _push(self):
self.__assert_cached()
if self.__get_tainted():
self.warn("Not pushing tainted artifact.")
return False
# Push all keys used for local commit via the Artifact member
pushed = self.__artifacts.push(self, self.__artifact)
if not pushed:
return False
# Notify successful upload
return True
# _shell():
#
# Connects the terminal with a shell running in a staged
# environment
#
# Args:
# scope (Scope): Either BUILD or RUN scopes are valid, or None
# mounts (list): A list of (str, str) tuples, representing host/target paths to mount
# isolate (bool): Whether to isolate the environment like we do in builds
# prompt (str): A suitable prompt string for PS1
# command (list): An argv to launch in the sandbox
# usebuildtree (bool): Use the buildtree as its source
#
# Returns: Exit code
def _shell(self, scope=None, *, mounts=None, isolate=False, prompt=None, command=None, usebuildtree=False):
with self._prepare_sandbox(scope, shell=True, usebuildtree=usebuildtree) as sandbox:
environment = self.get_environment()
environment = copy.copy(environment)
flags = SandboxFlags.INTERACTIVE | SandboxFlags.ROOT_READ_ONLY
# Fetch the main toplevel project, in case this is a junctioned
# subproject, we want to use the rules defined by the main one.
context = self._get_context()
project = context.get_toplevel_project()
shell_command, shell_environment, shell_host_files = project.get_shell_config()
if prompt is not None:
environment["PS1"] = prompt
# Special configurations for non-isolated sandboxes
if not isolate:
# Open the network, and reuse calling uid/gid
#
flags |= SandboxFlags.NETWORK_ENABLED | SandboxFlags.INHERIT_UID
# Apply project defined environment vars to set for a shell
for key, value in shell_environment.items():
environment[key] = value
# Setup any requested bind mounts
if mounts is None:
mounts = []
for mount in shell_host_files + mounts:
if not os.path.exists(mount.host_path):
if not mount.optional:
self.warn("Not mounting non-existing host file: {}".format(mount.host_path))
else:
sandbox.mark_directory(mount.path)
sandbox._set_mount_source(mount.path, mount.host_path)
if command:
argv = command
else:
argv = shell_command
self.status("Running command", detail=" ".join(argv))
# Run shells with network enabled and readonly root.
return sandbox.run(argv, flags, env=environment)
# _open_workspace():
#
# "Open" a workspace for this element
#
# This requires that a workspace already be created in
# the workspaces metadata first.
#
def _open_workspace(self):
context = self._get_context()
workspace = self._get_workspace()
assert workspace is not None
# First lets get a temp dir in our build directory
# and stage there, then link the files over to the desired
# path.
#
# We do this so that force opening workspaces which overwrites
# files in the target directory actually works without any
# additional support from Source implementations.
#
os.makedirs(context.builddir, exist_ok=True)
with utils._tempdir(dir=context.builddir, prefix="workspace-{}".format(self.normal_name)) as temp:
self.__sources.init_workspace(temp)
# Now hardlink the files into the workspace target.
utils.link_files(temp, workspace.get_absolute_path())
# _get_workspace():
#
# Returns:
# (Workspace|None): A workspace associated with this element
#
def _get_workspace(self):
workspaces = self._get_context().get_workspaces()
return workspaces.get_workspace(self._get_full_name())
# _write_script():
#
# Writes a script to the given directory.
def _write_script(self, directory):
with open(_site.build_module_template, "r") as f:
script_template = f.read()
variable_string = ""
for var, val in self.get_environment().items():
variable_string += "{0}={1} ".format(var, val)
script = script_template.format(
name=self.normal_name,
build_root=self.get_variable("build-root"),
install_root=self.get_variable("install-root"),
variables=variable_string,
commands=self.generate_script(),
)
os.makedirs(directory, exist_ok=True)
script_path = os.path.join(directory, "build-" + self.normal_name)
with self.timed_activity("Writing build script", silent_nested=True):
with utils.save_file_atomic(script_path, "w") as script_file:
script_file.write(script)
os.chmod(script_path, stat.S_IEXEC | stat.S_IREAD)
# Returns the element whose sources this element is ultimately derived from.
#
# This is intended for being used to redirect commands that operate on an
# element to the element whose sources it is ultimately derived from.
#
# For example, element A is a build element depending on source foo,
# element B is a filter element that depends on element A. The source
# element of B is A, since B depends on A, and A has sources.
#
def _get_source_element(self):
return self
# _cached_buildtree()
#
# Check if element artifact contains expected buildtree. An
# element's buildtree artifact will not be present if the rest
# of the partial artifact is not cached.
#
# Returns:
# (bool): True if artifact cached with buildtree, False if
# element not cached or missing expected buildtree.
# Note this only confirms if a buildtree is present,
# not its contents.
#
def _cached_buildtree(self):
if not self._cached():
return False
return self.__artifact.cached_buildtree()
# _buildtree_exists()
#
# Check if artifact was created with a buildtree. This does not check
# whether the buildtree is present in the local cache.
#
# Returns:
# (bool): True if artifact was created with buildtree, False if
# element not cached or not created with a buildtree.
#
def _buildtree_exists(self):
if not self._cached():
return False
return self.__artifact.buildtree_exists()
# _cached_logs()
#
# Check if the artifact is cached with log files.
#
# Returns:
# (bool): True if artifact is cached with logs, False if
# element not cached or missing logs.
#
def _cached_logs(self):
return self.__artifact.cached_logs()
# _fetch()
#
# Fetch the element's sources.
#
# Raises:
# SourceError: If one of the element sources has an error
#
def _fetch(self, fetch_original=False):
self.__sources.fetch(fetch_original=fetch_original)
# _calculate_cache_key():
#
# Calculates the cache key
#
# Returns:
# (str): A hex digest cache key for this Element, or None
#
# None is returned if information for the cache key is missing.
#
def _calculate_cache_key(self, dependencies):
# No cache keys for dependencies which have no cache keys
if None in dependencies:
return None
# Generate dict that is used as base for all cache keys
if self.__cache_key_dict is None:
# Filter out nocache variables from the element's environment
cache_env = {key: value for key, value in self.__environment.items() if key not in self.__env_nocache}
project = self._get_project()
self.__cache_key_dict = {
"core-artifact-version": BST_CORE_ARTIFACT_VERSION,
"element-plugin-key": self.get_unique_key(),
"element-plugin-name": self.get_kind(),
"element-plugin-version": self.BST_ARTIFACT_VERSION,
"sandbox": self.__sandbox_config.get_unique_key(),
"environment": cache_env,
"public": self.__public.strip_node_info(),
}
self.__cache_key_dict["sources"] = self.__sources.get_unique_key()
self.__cache_key_dict["fatal-warnings"] = sorted(project._fatal_warnings)
cache_key_dict = self.__cache_key_dict.copy()
cache_key_dict["dependencies"] = dependencies
return _cachekey.generate_key(cache_key_dict)
# _has_all_sources_in_source_cache()
#
# Get whether all sources of the element are cached in CAS
#
# Returns:
# (bool): True if the element sources are in CAS
#
def _has_all_sources_in_source_cache(self):
return self.__sources.cached()
# _has_all_sources_resolved()
#
# Get whether all sources of the element are resolved
#
# Returns:
# (bool): True if all element sources are resolved
#
def _has_all_sources_resolved(self):
return self.__sources.is_resolved()
# _fetch_needed():
#
# Return whether sources need to be fetched from a remote
#
# Returns:
# (bool): True if one or more element sources need to be fetched
#
def _fetch_needed(self):
return not self.__sources.cached() and not self.__sources.cached_original()
# _should_fetch():
#
# Return whether we need to run the fetch stage for this element
#
# Args:
# fetch_original (bool): whether we need the original unstaged source
#
# Returns:
# (bool): True if a fetch job is required
#
def _should_fetch(self, fetch_original=False):
if fetch_original:
return not self.__sources.cached_original()
return not self.__sources.cached()
# _set_required_callback()
#
#
# Notify the pull/fetch/build queue that the element is potentially
# ready to be processed.
#
# _Set the _required_callback - the _required_callback is invoked when an
# element is marked as required. This informs us that the element needs to
# either be pulled or fetched + built.
#
# Args:
# callback (callable) - The callback function
#
def _set_required_callback(self, callback):
self.__required_callback = callback
# _set_can_query_cache_callback()
#
# Notify the pull/fetch queue that the element is potentially
# ready to be processed.
#
# Set the _can_query_cache_callback - the _can_query_cache_callback is
# invoked when an element becomes able to query the cache. That is,
# the (non-workspaced) element's strict cache key has been calculated.
# However, if the element is workspaced, we also invoke this callback
# once its build has been scheduled - this ensures that the workspaced
# element does not get blocked in the pull queue.
#
# Args:
# callback (callable) - The callback function
#
def _set_can_query_cache_callback(self, callback):
self.__can_query_cache_callback = callback
# _set_buildable_callback()
#
# Notifiy the build queue that the element is potentially ready
# to be processed
#
# Set the _buildable_callback - the _buildable_callback is invoked when
# an element is marked as "buildable". That is, its sources are consistent,
# its been scheduled to be built and all of its build dependencies have
# had their cache key's calculated and are cached.
#
# Args:
# callback (callable) - The callback function
#
def _set_buildable_callback(self, callback):
self.__buildable_callback = callback
# _set_depth()
#
# Set the depth of the Element.
#
# The depth represents the position of the Element within the current
# session's dependency graph. A depth of zero represents the bottommost element.
#
def _set_depth(self, depth):
self._depth = depth
# _update_ready_for_runtime_and_cached()
#
# An Element becomes ready for runtime and cached once the following criteria
# are met:
# 1. The Element has a strong cache key
# 2. The Element is cached (locally)
# 3. The runtime dependencies of the Element are ready for runtime and cached.
#
# These criteria serve as potential trigger points as to when an Element may have
# become ready for runtime and cached.
#
# Once an Element becomes ready for runtime and cached, we notify the reverse
# runtime dependencies and the reverse build dependencies of the element, decrementing
# the appropriate counters.
#
def _update_ready_for_runtime_and_cached(self):
if not self.__ready_for_runtime_and_cached:
if self.__runtime_deps_uncached == 0 and self._cached_success() and self.__cache_key:
self.__ready_for_runtime_and_cached = True
# Notify reverse dependencies
for rdep in self.__reverse_runtime_deps:
rdep.__runtime_deps_uncached -= 1
assert not rdep.__runtime_deps_uncached < 0
# Try to notify reverse dependencies if all runtime deps are ready
if rdep.__runtime_deps_uncached == 0:
rdep._update_ready_for_runtime_and_cached()
for rdep in self.__reverse_build_deps:
rdep.__build_deps_uncached -= 1
assert not rdep.__build_deps_uncached < 0
if rdep.__buildable_callback is not None and rdep._buildable():
rdep.__buildable_callback(rdep)
rdep.__buildable_callback = None
def _walk_artifact_files(self):
yield from self.__artifact.get_files().walk()
# _get_artifact()
#
# Return the Element's Artifact object
#
# Returns:
# (Artifact): The Artifact object of the Element
#
def _get_artifact(self):
assert self.__artifact, "{}: has no Artifact object".format(self.name)
return self.__artifact
# _add_build_dependency()
#
# Add a build dependency to the Element
#
# Args:
# (Element): The Element to add as a build dependency
#
def _add_build_dependency(self, dependency):
self.__build_dependencies.append(dependency)
#############################################################
# Private Local Methods #
#############################################################
# __load_sources()
#
# Load the Source objects from the LoadElement
#
def __load_sources(self, load_element):
project = self._get_project()
workspace = self._get_workspace()
meta_sources = []
# If there's a workspace for this element then we just load a workspace
# source plugin instead of the real plugins
if workspace:
workspace_node = {"kind": "workspace"}
workspace_node["path"] = workspace.get_absolute_path()
workspace_node["last_build"] = str(workspace.to_dict().get("last_build", ""))
meta = MetaSource(
self.name,
0,
self.get_kind(),
"workspace",
Node.from_dict(workspace_node),
None,
load_element.first_pass,
)
meta_sources.append(meta)
else:
sources = load_element.node.get_sequence(Symbol.SOURCES, default=[])
for index, source in enumerate(sources):
kind = source.get_scalar(Symbol.KIND)
# The workspace source plugin is only valid for internal use
if kind.as_str() == "workspace":
raise LoadError(
"{}: Invalid usage of workspace source kind".format(kind.get_provenance()),
LoadErrorReason.INVALID_DATA,
)
del source[Symbol.KIND]
# Directory is optional
directory = source.get_str(Symbol.DIRECTORY, default=None)
if directory:
del source[Symbol.DIRECTORY]
meta_source = MetaSource(
self.name, index, self.get_kind(), kind.as_str(), source, directory, load_element.first_pass
)
meta_sources.append(meta_source)
for meta_source in meta_sources:
source = project.create_source(meta_source, variables=self.__variables)
redundant_ref = source._load_ref()
self.__sources.add_source(source)
# Collect redundant refs which occurred at load time
if redundant_ref is not None:
self.__redundant_source_refs.append((source, redundant_ref))
# __get_dependency_refs()
#
# Retrieve the artifact refs of the element's dependencies
#
# Args:
# scope (Scope): The scope of dependencies
#
# Returns:
# (list [str]): A list of refs of all dependencies in staging order.
#
def __get_dependency_refs(self, scope):
return [
os.path.join(dep.project_name, _get_normal_name(dep.name), dep._get_cache_key())
for dep in self.dependencies(scope)
]
# __get_last_build_artifact()
#
# Return the Artifact of the previous build of this element,
# if incremental build is available.
#
# Returns:
# (Artifact): The Artifact of the previous build or None
#
def __get_last_build_artifact(self):
workspace = self._get_workspace()
if not workspace:
# Currently incremental builds are only supported for workspaces
return None
if not workspace.last_build:
return None
artifact = Artifact(self, self._get_context(), strong_key=workspace.last_build)
if not artifact.cached():
return None
if not artifact.cached_buildtree():
return None
if not artifact.cached_sources():
return None
# Don't perform an incremental build if there has been a change in
# build dependencies.
old_dep_refs = artifact.get_dependency_refs(Scope.BUILD)
new_dep_refs = self.__get_dependency_refs(Scope.BUILD)
if old_dep_refs != new_dep_refs:
return None
return artifact
# __configure_sandbox():
#
# Internal method for calling public abstract configure_sandbox() method.
#
def __configure_sandbox(self, sandbox):
self.__batch_prepare_assemble = False
self.configure_sandbox(sandbox)
# __prepare():
#
# Internal method for calling public abstract prepare() method.
#
def __prepare(self, sandbox):
self.prepare(sandbox)
# __preflight():
#
# A internal wrapper for calling the abstract preflight() method on
# the element and its sources.
#
def __preflight(self):
if self.BST_FORBID_RDEPENDS and self.BST_FORBID_BDEPENDS:
if any(self.dependencies(Scope.RUN, recurse=False)) or any(self.dependencies(Scope.BUILD, recurse=False)):
raise ElementError(
"{}: Dependencies are forbidden for '{}' elements".format(self, self.get_kind()),
reason="element-forbidden-depends",
)
if self.BST_FORBID_RDEPENDS:
if any(self.dependencies(Scope.RUN, recurse=False)):
raise ElementError(
"{}: Runtime dependencies are forbidden for '{}' elements".format(self, self.get_kind()),
reason="element-forbidden-rdepends",
)
if self.BST_FORBID_BDEPENDS:
if any(self.dependencies(Scope.BUILD, recurse=False)):
raise ElementError(
"{}: Build dependencies are forbidden for '{}' elements".format(self, self.get_kind()),
reason="element-forbidden-bdepends",
)
if self.BST_FORBID_SOURCES:
if any(self.sources()):
raise ElementError(
"{}: Sources are forbidden for '{}' elements".format(self, self.get_kind()),
reason="element-forbidden-sources",
)
try:
self.preflight()
except BstError as e:
# Prepend provenance to the error
raise ElementError("{}: {}".format(self, e), reason=e.reason, detail=e.detail) from e
self.__sources.preflight()
# __assert_cached()
#
# Raises an error if the artifact is not cached.
#
def __assert_cached(self):
assert self._cached(), "{}: Missing artifact {}".format(self, self._get_brief_display_key())
# __get_tainted():
#
# Checkes whether this artifact should be pushed to an artifact cache.
#
# Args:
# recalculate (bool) - Whether to force recalculation
#
# Returns:
# (bool) False if this artifact should be excluded from pushing.
#
# Note:
# This method should only be called after the element's
# artifact is present in the local artifact cache.
#
def __get_tainted(self, recalculate=False):
if recalculate or self.__tainted is None:
# Whether this artifact has a workspace
workspaced = self.__artifact.get_metadata_workspaced()
# Whether this artifact's dependencies have workspaces
workspaced_dependencies = self.__artifact.get_metadata_workspaced_dependencies()
# Other conditions should be or-ed
self.__tainted = workspaced or workspaced_dependencies
return self.__tainted
# __use_remote_execution():
#
# Returns True if remote execution is configured and the element plugin
# supports it.
#
def __use_remote_execution(self):
return bool(self.__remote_execution_specs)
# __sandbox():
#
# A context manager to prepare a Sandbox object at the specified directory,
# if the directory is None, then a directory will be chosen automatically
# in the configured build directory.
#
# Args:
# directory (str): The local directory where the sandbox will live, or None
# stdout (fileobject): The stream for stdout for the sandbox
# stderr (fileobject): The stream for stderr for the sandbox
# config (SandboxConfig): The SandboxConfig object
# allow_remote (bool): Whether the sandbox is allowed to be remote
#
# Yields:
# (Sandbox): A usable sandbox
#
@contextmanager
def __sandbox(self, directory, stdout=None, stderr=None, config=None, allow_remote=True):
context = self._get_context()
project = self._get_project()
platform = context.platform
if self._get_workspace():
output_node_properties = ["mtime"]
else:
output_node_properties = None
if directory is not None and allow_remote and self.__use_remote_execution():
self.info("Using a remote sandbox for artifact {} with directory '{}'".format(self.name, directory))
output_files_required = context.require_artifact_files or self._artifact_files_required()
sandbox = SandboxRemote(
context,
project,
directory,
plugin=self,
stdout=stdout,
stderr=stderr,
config=config,
specs=self.__remote_execution_specs,
output_files_required=output_files_required,
output_node_properties=output_node_properties,
)
yield sandbox
elif directory is not None and os.path.exists(directory):
platform = context.platform
platform.check_sandbox_config(config)
sandbox = platform.create_sandbox(
context,
project,
directory,
plugin=self,
stdout=stdout,
stderr=stderr,
config=config,
output_node_properties=output_node_properties,
)
yield sandbox
else:
os.makedirs(context.builddir, exist_ok=True)
# Recursive contextmanager...
with utils._tempdir(
prefix="{}-".format(self.normal_name), dir=context.builddir
) as rootdir, self.__sandbox(
rootdir, stdout=stdout, stderr=stderr, config=config, allow_remote=allow_remote
) as sandbox:
yield sandbox
@classmethod
def __compose_default_splits(cls, project, defaults, first_pass):
element_public = defaults.get_mapping(Symbol.PUBLIC, default={})
element_bst = element_public.get_mapping("bst", default={})
element_splits = element_bst.get_mapping("split-rules", default={})
if first_pass:
splits = element_splits.clone()
else:
assert project._splits is not None
splits = project._splits.clone()
# Extend project wide split rules with any split rules defined by the element
element_splits._composite(splits)
element_bst["split-rules"] = splits
element_public["bst"] = element_bst
defaults[Symbol.PUBLIC] = element_public
@classmethod
def __init_defaults(cls, project, plugin_conf, kind, first_pass):
# Defaults are loaded once per class and then reused
#
if cls.__defaults is None:
defaults = Node.from_dict({})
if plugin_conf is not None:
# Load the plugin's accompanying .yaml file if one was provided
try:
defaults = _yaml.load(plugin_conf, os.path.basename(plugin_conf))
except LoadError as e:
if e.reason != LoadErrorReason.MISSING_FILE:
raise e
# Special case; compose any element-wide split-rules declarations
cls.__compose_default_splits(project, defaults, first_pass)
# Override the element's defaults with element specific
# overrides from the project.conf
if first_pass:
elements = project.first_pass_config.element_overrides
else:
elements = project.element_overrides
overrides = elements.get_mapping(kind, default=None)
if overrides:
overrides._composite(defaults)
# Set the data class wide
cls.__defaults = defaults
# This will acquire the environment to be used when
# creating sandboxes for this element
#
@classmethod
def __extract_environment(cls, project, load_element):
default_env = cls.__defaults.get_mapping(Symbol.ENVIRONMENT, default={})
element_env = load_element.node.get_mapping(Symbol.ENVIRONMENT, default={}) or Node.from_dict({})
if load_element.first_pass:
environment = Node.from_dict({})
else:
environment = project.base_environment.clone()
default_env._composite(environment)
element_env._composite(environment)
environment._assert_fully_composited()
return environment
@classmethod
def __extract_env_nocache(cls, project, load_element):
if load_element.first_pass:
project_nocache = []
else:
project_nocache = project.base_env_nocache
default_nocache = cls.__defaults.get_str_list(Symbol.ENV_NOCACHE, default=[])
element_nocache = load_element.node.get_str_list(Symbol.ENV_NOCACHE, default=[])
# Accumulate values from the element default, the project and the element
# itself to form a complete list of nocache env vars.
env_nocache = set(project_nocache + default_nocache + element_nocache)
# Convert back to list now we know they're unique
return list(env_nocache)
# This will resolve the final variables to be used when
# substituting command strings to be run in the sandbox
#
@classmethod
def __extract_variables(cls, project, load_element):
default_vars = cls.__defaults.get_mapping(Symbol.VARIABLES, default={})
element_vars = load_element.node.get_mapping(Symbol.VARIABLES, default={}) or Node.from_dict({})
if load_element.first_pass:
variables = project.first_pass_config.base_variables.clone()
else:
variables = project.base_variables.clone()
default_vars._composite(variables)
element_vars._composite(variables)
variables._assert_fully_composited()
for var in ("project-name", "element-name", "max-jobs"):
node = variables.get_node(var, allow_none=True)
if node is None:
continue
provenance = node.get_provenance()
if not provenance._is_synthetic:
raise LoadError(
"{}: invalid redefinition of protected variable '{}'".format(provenance, var),
LoadErrorReason.PROTECTED_VARIABLE_REDEFINED,
)
return variables
# This will resolve the final configuration to be handed
# off to element.configure()
#
@classmethod
def __extract_config(cls, load_element):
element_config = load_element.node.get_mapping(Symbol.CONFIG, default={}) or Node.from_dict({})
# The default config is already composited with the project overrides
config = cls.__defaults.get_mapping(Symbol.CONFIG, default={})
config = config.clone()
element_config._composite(config)
config._assert_fully_composited()
return config
# Sandbox-specific configuration data, to be passed to the sandbox's constructor.
#
@classmethod
def __extract_sandbox_config(cls, project, load_element):
element_sandbox = load_element.node.get_mapping(Symbol.SANDBOX, default={}) or Node.from_dict({})
if load_element.first_pass:
sandbox_config = Node.from_dict({})
else:
sandbox_config = project._sandbox.clone()
# The default config is already composited with the project overrides
sandbox_defaults = cls.__defaults.get_mapping(Symbol.SANDBOX, default={})
sandbox_defaults = sandbox_defaults.clone()
sandbox_defaults._composite(sandbox_config)
element_sandbox._composite(sandbox_config)
sandbox_config._assert_fully_composited()
return sandbox_config
# This makes a special exception for the split rules, which
# elements may extend but whos defaults are defined in the project.
#
@classmethod
def __extract_public(cls, load_element):
element_public = load_element.node.get_mapping(Symbol.PUBLIC, default={}) or Node.from_dict({})
base_public = cls.__defaults.get_mapping(Symbol.PUBLIC, default={})
base_public = base_public.clone()
base_bst = base_public.get_mapping("bst", default={})
base_splits = base_bst.get_mapping("split-rules", default={})
element_public = element_public.clone()
element_bst = element_public.get_mapping("bst", default={})
element_splits = element_bst.get_mapping("split-rules", default={})
# Allow elements to extend the default splits defined in their project or
# element specific defaults
element_splits._composite(base_splits)
element_bst["split-rules"] = base_splits
element_public["bst"] = element_bst
element_public._assert_fully_composited()
return element_public
def __init_splits(self):
bstdata = self.get_public_data("bst")
splits = bstdata.get_mapping("split-rules")
self.__splits = {
domain: re.compile("^(?:" + "|".join([utils._glob2re(r) for r in rules.as_str_list()]) + ")$")
for domain, rules in splits.items()
}
# __split_filter():
#
# Returns True if the file with the specified `path` is included in the
# specified split domains. This is used by `__split_filter_func()` to create
# a filter callback.
#
# Args:
# element_domains (list): All domains for this element
# include (list): A list of domains to include files from
# exclude (list): A list of domains to exclude files from
# orphans (bool): Whether to include files not spoken for by split domains
# path (str): The relative path of the file
#
# Returns:
# (bool): Whether to include the specified file
#
def __split_filter(self, element_domains, include, exclude, orphans, path):
# Absolute path is required for matching
filename = os.path.join(os.sep, path)
include_file = False
exclude_file = False
claimed_file = False
for domain in element_domains:
if self.__splits[domain].match(filename):
claimed_file = True
if domain in include:
include_file = True
if domain in exclude:
exclude_file = True
if orphans and not claimed_file:
include_file = True
return include_file and not exclude_file
# __split_filter_func():
#
# Returns callable split filter function for use with `copy_files()`,
# `link_files()` or `Directory.import_files()`.
#
# Args:
# include (list): An optional list of domains to include files from
# exclude (list): An optional list of domains to exclude files from
# orphans (bool): Whether to include files not spoken for by split domains
#
# Returns:
# (callable): Filter callback that returns True if the file is included
# in the specified split domains.
#
def __split_filter_func(self, include=None, exclude=None, orphans=True):
# No splitting requested, no filter needed
if orphans and not (include or exclude):
return None
if not self.__splits:
self.__init_splits()
element_domains = list(self.__splits.keys())
if not include:
include = element_domains
if not exclude:
exclude = []
# Ignore domains that dont apply to this element
#
include = [domain for domain in include if domain in element_domains]
exclude = [domain for domain in exclude if domain in element_domains]
# The arguments element_domains, include, exclude, and orphans are
# the same for all files. Use `partial` to create a function with
# the required callback signature: a single `path` parameter.
return partial(self.__split_filter, element_domains, include, exclude, orphans)
def __compute_splits(self, include=None, exclude=None, orphans=True):
filter_func = self.__split_filter_func(include=include, exclude=exclude, orphans=orphans)
files_vdir = self.__artifact.get_files()
element_files = files_vdir.list_relative_paths()
if not filter_func:
# No splitting requested, just report complete artifact
yield from element_files
else:
for filename in element_files:
if filter_func(filename):
yield filename
def __file_is_whitelisted(self, path):
# Considered storing the whitelist regex for re-use, but public data
# can be altered mid-build.
# Public data is not guaranteed to stay the same for the duration of
# the build, but I can think of no reason to change it mid-build.
# If this ever changes, things will go wrong unexpectedly.
if not self.__whitelist_regex:
bstdata = self.get_public_data("bst")
whitelist = bstdata.get_sequence("overlap-whitelist", default=[])
whitelist_expressions = [utils._glob2re(self.__variables.subst(node)) for node in whitelist]
expression = "^(?:" + "|".join(whitelist_expressions) + ")$"
self.__whitelist_regex = re.compile(expression)
return self.__whitelist_regex.match(os.path.join(os.sep, path))
# __load_public_data():
#
# Loads the public data from the cached artifact
#
def __load_public_data(self):
self.__assert_cached()
assert self.__dynamic_public is None
self.__dynamic_public = self.__artifact.load_public_data()
def __load_build_result(self):
self.__assert_cached()
assert self.__build_result is None
self.__build_result = self.__artifact.load_build_result()
# __pull_strong():
#
# Attempt pulling given element from configured artifact caches with
# the strict cache key
#
# Args:
# progress (callable): The progress callback, if any
# subdir (str): The optional specific subdir to pull
# excluded_subdirs (list): The optional list of subdirs to not pull
#
# Returns:
# (bool): Whether or not the pull was successful
#
def __pull_strong(self, *, pull_buildtrees):
weak_key = self._get_cache_key(strength=_KeyStrength.WEAK)
key = self.__strict_cache_key
if not self.__artifacts.pull(self, key, pull_buildtrees=pull_buildtrees):
return False
# update weak ref by pointing it to this newly fetched artifact
self.__artifacts.link_key(self, key, weak_key)
return True
# __pull_weak():
#
# Attempt pulling given element from configured artifact caches with
# the weak cache key
#
# Args:
# subdir (str): The optional specific subdir to pull
# excluded_subdirs (list): The optional list of subdirs to not pull
#
# Returns:
# (bool): Whether or not the pull was successful
#
def __pull_weak(self, *, pull_buildtrees):
weak_key = self._get_cache_key(strength=_KeyStrength.WEAK)
if not self.__artifacts.pull(self, weak_key, pull_buildtrees=pull_buildtrees):
return False
# extract strong cache key from this newly fetched artifact
self._pull_done()
# create tag for strong cache key
key = self._get_cache_key(strength=_KeyStrength.STRONG)
self.__artifacts.link_key(self, weak_key, key)
return True
# __update_cache_keys()
#
# Updates weak and strict cache keys
#
# Note that it does not update *all* cache keys - In non-strict mode, the
# strong cache key is updated in __update_cache_key_non_strict()
#
# If the element's is not resolved, this is
# a no-op (since inconsistent elements cannot have cache keys).
#
# The weak and strict cache keys will be calculated if not already
# set.
#
# The weak cache key is a cache key that doesn't change when its
# runtime dependencies change, useful for avoiding full rebuilds
# when one's dependencies guarantee stability across
# versions. Changes in build dependencies still force a rebuild,
# since those will change the built artifact directly.
#
# The strict cache key is a cache key that changes if any
# dependency has changed.
#
def __update_cache_keys(self):
if not self._has_all_sources_resolved():
# Tracking may still be pending
return
context = self._get_context()
if self.__weak_cache_key is None:
# Calculate weak cache key
#
# Weak cache key includes names of direct build dependencies
# so as to only trigger rebuilds when the shape of the
# dependencies change.
#
# Some conditions cause dependencies to be strict, such
# that this element will be rebuilt anyway if the dependency
# changes even in non strict mode, for these cases we just
# encode the dependency's weak cache key instead of it's name.
#
dependencies = [
[e.project_name, e.name, e._get_cache_key(strength=_KeyStrength.WEAK)]
if self.BST_STRICT_REBUILD or e in self.__strict_dependencies
else [e.project_name, e.name]
for e in self.dependencies(Scope.BUILD)
]
self.__weak_cache_key = self._calculate_cache_key(dependencies)
if self.__weak_cache_key is None:
# Weak cache key could not be calculated yet, therefore
# the Strict cache key also can't be calculated yet.
return
if self.__strict_cache_key is None:
dependencies = [
[e.project_name, e.name, e.__strict_cache_key] if e.__strict_cache_key is not None else None
for e in self.dependencies(Scope.BUILD)
]
self.__strict_cache_key = self._calculate_cache_key(dependencies)
if self.__strict_cache_key is not None:
# In strict mode, the strong cache key always matches the strict cache key
if context.get_strict():
self.__cache_key = self.__strict_cache_key
# The Element may have just become ready for runtime now that the
# strong cache key has just been set
self.__update_ready_for_runtime()
else:
self.__update_strict_cache_key_of_rdeps()
if self.__strict_cache_key is not None and self.__can_query_cache_callback is not None:
self.__can_query_cache_callback(self)
self.__can_query_cache_callback = None
# If we've newly calculated a cache key, our artifact's
# current state will also change - after all, we can now find
# a potential existing artifact.
if self.__weak_cache_key is not None or self.__strict_cache_key is not None:
self.__update_artifact_state()
# __update_artifact_state()
#
# Updates the data involved in knowing about the artifact corresponding
# to this element.
#
# If the state changes, this will subsequently call
# `self.__schedule_assembly_when_necessary()` to schedule assembly if it becomes
# possible.
#
# Element.__update_cache_keys() must be called before this to have
# meaningful results, because the element must know its cache key before
# it can check whether an artifact exists for that cache key.
#
def __update_artifact_state(self):
context = self._get_context()
if not self.__weak_cache_key:
return
if not context.get_strict() and not self.__artifact:
# We've calculated the weak_key, so instantiate artifact instance member
self.__artifact = Artifact(self, context, weak_key=self.__weak_cache_key)
self.__schedule_assembly_when_necessary()
if not self.__strict_cache_key:
return
if not self.__strict_artifact:
self.__strict_artifact = Artifact(
self, context, strong_key=self.__strict_cache_key, weak_key=self.__weak_cache_key
)
if context.get_strict():
self.__artifact = self.__strict_artifact
self.__schedule_assembly_when_necessary()
else:
self.__update_cache_key_non_strict()
# __update_cache_key_non_strict()
#
# Calculates the strong cache key if it hasn't already been set.
#
# When buildstream runs in strict mode, this is identical to the
# strict cache key, so no work needs to be done.
#
# When buildstream is not run in strict mode, this requires the artifact
# state (as set in Element.__update_artifact_state()) to be set accordingly,
# as the cache key can be loaded from the cache (possibly pulling from
# a remote cache).
#
def __update_cache_key_non_strict(self):
if not self.__strict_artifact:
return
# The final cache key can be None here only in non-strict mode
if self.__cache_key is None:
if self._pull_pending():
# Effective strong cache key is unknown until after the pull
pass
elif self._cached():
# Load the strong cache key from the artifact
strong_key, _ = self.__artifact.get_metadata_keys()
self.__cache_key = strong_key
elif self.__assemble_scheduled or self.__assemble_done:
# Artifact will or has been built, not downloaded
dependencies = [[e.project_name, e.name, e._get_cache_key()] for e in self.dependencies(Scope.BUILD)]
self.__cache_key = self._calculate_cache_key(dependencies)
if self.__cache_key is None:
# Strong cache key could not be calculated yet
return
# The Element may have just become ready for runtime now that the
# strong cache key has just been set
self.__update_ready_for_runtime()
# Now we have the strong cache key, update the Artifact
self.__artifact._cache_key = self.__cache_key
# __update_strict_cache_key_of_rdeps()
#
# Once an Element is given its strict cache key, immediately inform
# its reverse dependencies and see if their strict cache key can be
# obtained
#
def __update_strict_cache_key_of_rdeps(self):
if any(
(
# If we've previously updated these we don't need to do so
# again.
self.__updated_strict_cache_keys_of_rdeps,
# We can't do this until none of *our* rdeps are lacking a
# strict cache key.
not self.__runtime_deps_without_strict_cache_key == 0,
# If we don't have a strict cache key we can't do this either.
self.__strict_cache_key is None,
)
):
return
self.__updated_strict_cache_keys_of_rdeps = True
# Notify reverse dependencies
for rdep in self.__reverse_runtime_deps:
rdep.__runtime_deps_without_strict_cache_key -= 1
assert not rdep.__runtime_deps_without_strict_cache_key < 0
if rdep.__runtime_deps_without_strict_cache_key == 0:
rdep.__update_strict_cache_key_of_rdeps()
for rdep in self.__reverse_build_deps:
rdep.__build_deps_without_strict_cache_key -= 1
assert not rdep.__build_deps_without_strict_cache_key < 0
if rdep.__build_deps_without_strict_cache_key == 0:
rdep.__update_cache_keys()
# __update_ready_for_runtime()
#
# An Element becomes ready for runtime when:
#
# 1. The Element has a strong cache key
# 2. The runtime dependencies of the Element are ready for runtime
#
# These criteria serve as potential trigger points as to when an Element may have
# become ready for runtime.
#
# Once an Element becomes ready for runtime, we notify the reverse
# runtime dependencies and the reverse build dependencies of the Element,
# decrementing the appropriate counters.
#
def __update_ready_for_runtime(self):
if any(
(
# We're already ready for runtime; no update required
self.__ready_for_runtime,
# If not all our dependencies are ready yet, we can't be ready
# either.
not self.__runtime_deps_without_cache_key == 0,
# If our cache state has not been resolved, we can't be ready.
self.__cache_key is None,
)
):
return
self.__ready_for_runtime = True
# Notify reverse dependencies
for rdep in self.__reverse_runtime_deps:
rdep.__runtime_deps_without_cache_key -= 1
assert not rdep.__runtime_deps_without_cache_key < 0
# If all of our runtimes have cache keys, we can calculate ours
if rdep.__runtime_deps_without_cache_key == 0:
rdep.__update_ready_for_runtime()
for rdep in self.__reverse_build_deps:
rdep.__build_deps_without_cache_key -= 1
assert not rdep.__build_deps_without_cache_key < 0
if rdep.__build_deps_without_cache_key == 0:
rdep.__update_cache_keys()
# If the element is cached, and has all of its runtime dependencies cached,
# now that we have the cache key, we are able to notify reverse dependencies
# that the element it ready. This is a likely trigger for workspaced elements.
self._update_ready_for_runtime_and_cached()
def _overlap_error_detail(f, forbidden_overlap_elements, elements):
if forbidden_overlap_elements:
return "/{}: {} {} not permitted to overlap other elements, order {} \n".format(
f,
" and ".join(forbidden_overlap_elements),
"is" if len(forbidden_overlap_elements) == 1 else "are",
" above ".join(reversed(elements)),
)
else:
return ""
# _get_normal_name():
#
# Get the element name without path separators or
# the extension.
#
# Args:
# element_name (str): The element's name
#
# Returns:
# (str): The normalised element name
#
def _get_normal_name(element_name):
return os.path.splitext(element_name.replace(os.sep, "-"))[0]
# _compose_artifact_name():
#
# Compose the completely resolved 'artifact_name' as a filepath
#
# Args:
# project_name (str): The project's name
# normal_name (str): The element's normalised name
# cache_key (str): The relevant cache key
#
# Returns:
# (str): The constructed artifact name path
#
def _compose_artifact_name(project_name, normal_name, cache_key):
valid_chars = string.digits + string.ascii_letters + "-._"
normal_name = "".join([x if x in valid_chars else "_" for x in normal_name])
# Note that project names are not allowed to contain slashes. Element names containing
# a '/' will have this replaced with a '-' upon Element object instantiation.
return "{0}/{1}/{2}".format(project_name, normal_name, cache_key)