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apache / buildstream / 513923eaeb5b6b8cdcb5674711f00c0d8eedfac9 / . / buildstream / element.py
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#
# Copyright (C) 2016-2018 Codethink Limited
#
# 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 bundle``, an Element may optionally implement this.
Class Reference
---------------
"""
import os
import re
import stat
import copy
from collections import Mapping, OrderedDict
from contextlib import contextmanager
from enum import Enum
import tempfile
import time
import shutil
from . import _yaml
from ._variables import Variables
from ._versions import BST_CORE_ARTIFACT_VERSION
from ._exceptions import BstError, LoadError, LoadErrorReason, ImplError, ErrorDomain
from .utils import UtilError
from . import Plugin, Consistency
from . import SandboxFlags
from . import utils
from . import _cachekey
from . import _signals
from . import _site
from ._platform import Platform
from .sandbox._config import SandboxConfig
# _KeyStrength():
#
# Strength of cache key
#
class _KeyStrength(Enum):
# Includes strong cache keys of all build dependencies and their
# runtime dependencies.
STRONG = 1
# Includes names of direct build dependencies but does not include
# cache keys of dependencies.
WEAK = 2
class Scope(Enum):
"""Types of scope for a given element"""
ALL = 1
"""All elements which the given element depends on, following
all elements required for building. Including the element itself.
"""
BUILD = 2
"""All elements required for building the element, including their
respective run dependencies. Not including the given element itself.
"""
RUN = 3
"""All elements required for running the element. Including the element
itself.
"""
class ElementError(BstError):
"""This exception should be raised by :class:`.Element` implementations
to report errors to the user.
Args:
message (str): The error message to report to the user
detail (str): A possibly multiline, more detailed error message
reason (str): An optional machine readable reason string, used for test cases
"""
def __init__(self, message, *, detail=None, reason=None):
super().__init__(message, detail=detail, domain=ErrorDomain.ELEMENT, reason=reason)
class Element(Plugin):
"""Element()
Base Element class.
All elements derive from this class, this interface defines how
the core will be interacting with Elements.
"""
__defaults = {} # The defaults from the yaml file and project
__defaults_set = False # Flag, in case there are no defaults at all
__instantiated_elements = {} # A hash of Element by MetaElement
__redundant_source_refs = [] # A list of (source, ref) tuples which were redundantly specified
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.
*Since: 1.2*
"""
BST_FORBID_BDEPENDS = False
"""Whether to raise exceptions if an element has build dependencies.
*Since: 1.2*
"""
BST_FORBID_SOURCES = False
"""Whether to raise exceptions if an element has sources.
*Since: 1.2*
"""
def __init__(self, context, project, artifacts, meta, plugin_conf):
super().__init__(meta.name, context, project, meta.provenance, "element")
self.normal_name = os.path.splitext(self.name.replace(os.sep, '-'))[0]
"""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.
"""
self.__runtime_dependencies = [] # Direct runtime dependency Elements
self.__build_dependencies = [] # Direct build dependency Elements
self.__sources = [] # List of Sources
self.__cache_key_dict = None # Dict for cache key calculation
self.__cache_key = None # Our cached cache key
self.__weak_cache_key = None # Our cached weak cache key
self.__strict_cache_key = None # Our cached cache key for strict builds
self.__artifacts = artifacts # Artifact cache
self.__consistency = Consistency.INCONSISTENT # Cached overall consistency state
self.__cached = None # Whether we have a cached artifact
self.__strong_cached = None # Whether we have a cached artifact
self.__assemble_scheduled = False # Element is scheduled to be assembled
self.__assemble_done = False # Element is assembled
self.__tracking_scheduled = False # Sources are scheduled to be tracked
self.__tracking_done = False # Sources have been tracked
self.__pull_done = False # Whether pull was attempted
self.__log_path = None # Path to dedicated log file or None
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.__staged_sources_directory = None # Location where Element.stage_sources() was called
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_size = None # The size of data committed to the artifact cache
# hash tables of loaded artifact metadata, hashed by key
self.__metadata_keys = {} # Strong and weak keys for this key
self.__metadata_dependencies = {} # Dictionary of dependency strong keys
self.__metadata_workspaced = {} # Boolean of whether it's workspaced
self.__metadata_workspaced_dependencies = {} # List of which dependencies are workspaced
# Ensure we have loaded this class's defaults
self.__init_defaults(plugin_conf)
# Collect the composited variables and resolve them
variables = self.__extract_variables(meta)
variables['element-name'] = self.name
self.__variables = Variables(variables)
# Collect the composited environment now that we have variables
env = self.__extract_environment(meta)
self.__environment = env
# Collect the environment nocache blacklist list
nocache = self.__extract_env_nocache(meta)
self.__env_nocache = nocache
# Grab public domain data declared for this instance
self.__public = self.__extract_public(meta)
self.__dynamic_public = None
# Collect the composited element configuration and
# ask the element to configure itself.
self.__config = self.__extract_config(meta)
self.configure(self.__config)
# Extract Sandbox config
self.__sandbox_config = self.__extract_sandbox_config(meta)
def __lt__(self, other):
return self.name < other.name
#############################################################
# Abstract Methods #
#############################################################
def configure_sandbox(self, sandbox):
"""Configures the the sandbox for execution
Args:
sandbox (:class:`.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):
"""Stage inputs into the sandbox directories
Args:
sandbox (:class:`.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):
"""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 (:class:`.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.
*Since: 1.2*
"""
pass
def assemble(self, sandbox):
"""Assemble the output artifact
Args:
sandbox (:class:`.Sandbox`): The build sandbox
Returns:
(str): 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):
"""Generate a build (sh) script to build this element
Returns:
(str): 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):
"""A generator function to enumerate the element sources
Yields:
(:class:`.Source`): The sources of this element
"""
for source in self.__sources:
yield source
def dependencies(self, scope, *, recurse=True, visited=None, recursed=False):
"""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 (:class:`.Scope`): The scope to iterate in
recurse (bool): Whether to recurse
Yields:
(:class:`.Element`): The dependencies in `scope`, in deterministic staging order
"""
if visited is None:
visited = {}
full_name = self._get_full_name()
scope_set = set((Scope.BUILD, Scope.RUN)) if scope == Scope.ALL else set((scope,))
if full_name in visited and scope_set.issubset(visited[full_name]):
return
should_yield = False
if full_name not in visited:
visited[full_name] = scope_set
should_yield = True
else:
visited[full_name] |= scope_set
if recurse or not recursed:
if scope == Scope.ALL:
for dep in self.__build_dependencies:
yield from dep.dependencies(Scope.ALL, recurse=recurse,
visited=visited, recursed=True)
for dep in self.__runtime_dependencies:
if dep not in self.__build_dependencies:
yield from dep.dependencies(Scope.ALL, recurse=recurse,
visited=visited, recursed=True)
elif scope == Scope.BUILD:
for dep in self.__build_dependencies:
yield from dep.dependencies(Scope.RUN, recurse=recurse,
visited=visited, recursed=True)
elif scope == Scope.RUN:
for dep in self.__runtime_dependencies:
yield from dep.dependencies(Scope.RUN, recurse=recurse,
visited=visited, recursed=True)
# Yeild self only at the end, after anything needed has been traversed
if should_yield and (recurse or recursed) and (scope == Scope.ALL or scope == Scope.RUN):
yield self
def search(self, scope, name):
"""Search for a dependency by name
Args:
scope (:class:`.Scope`): The scope to search
name (str): The dependency to search for
Returns:
(:class:`.Element`): 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_member(self, node, member_name, default=utils._sentinel):
"""Fetch the value of a string node member, substituting any variables
in the loaded value with the element contextual variables.
Args:
node (dict): A dictionary loaded from YAML
member_name (str): The name of the member to fetch
default (str): A value to return when *member_name* is not specified in *node*
Returns:
The value of *member_name* in *node*, otherwise *default*
Raises:
:class:`.LoadError`: When *member_name* is not found and no *default* was provided
This is essentially the same as :func:`~buildstream.plugin.Plugin.node_get_member`
except that it assumes the expected type is a string and will also perform variable
substitutions.
**Example:**
.. code:: python
# Expect a string 'name' in 'node', substituting any
# variables in the returned string
name = self.node_subst_member(node, 'name')
"""
value = self.node_get_member(node, str, member_name, default)
try:
return self.__variables.subst(value)
except LoadError as e:
provenance = _yaml.node_get_provenance(node, key=member_name)
raise LoadError(e.reason, '{}: {}'.format(provenance, str(e))) from e
def node_subst_list(self, node, member_name):
"""Fetch a list from a node member, substituting any variables in the list
Args:
node (dict): A dictionary loaded from YAML
member_name (str): The name of the member to fetch (a list)
Returns:
The list in *member_name*
Raises:
:class:`.LoadError`
This is essentially the same as :func:`~buildstream.plugin.Plugin.node_get_member`
except that it assumes the expected type is a list of strings and will also
perform variable substitutions.
"""
value = self.node_get_member(node, list, member_name)
ret = []
for index, x in enumerate(value):
try:
ret.append(self.__variables.subst(x))
except LoadError as e:
provenance = _yaml.node_get_provenance(node, key=member_name, indices=[index])
raise LoadError(e.reason, '{}: {}'.format(provenance, str(e))) from e
return ret
def node_subst_list_element(self, node, member_name, indices):
"""Fetch the value of a list element from a node member, substituting any variables
in the loaded value with the element contextual variables.
Args:
node (dict): A dictionary loaded from YAML
member_name (str): The name of the member to fetch
indices (list of int): List of indices to search, in case of nested lists
Returns:
The value of the list element in *member_name* at the specified *indices*
Raises:
:class:`.LoadError`
This is essentially the same as :func:`~buildstream.plugin.Plugin.node_get_list_element`
except that it assumes the expected type is a string and will also perform variable
substitutions.
**Example:**
.. code:: python
# Fetch the list itself
strings = self.node_get_member(node, list, 'strings')
# Iterate over the list indices
for i in range(len(strings)):
# Fetch the strings in this list, substituting content
# with our element's variables if needed
string = self.node_subst_list_element(
node, 'strings', [ i ])
"""
value = self.node_get_list_element(node, str, member_name, indices)
try:
return self.__variables.subst(value)
except LoadError as e:
provenance = _yaml.node_get_provenance(node, key=member_name, indices=indices)
raise LoadError(e.reason, '{}: {}'.format(provenance, str(e))) from e
def compute_manifest(self, *, include=None, exclude=None, orphans=True):
"""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 (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
Yields:
(str): The paths of the files in manifest
"""
self.__assert_cached()
return self.__compute_splits(include, exclude, orphans)
def stage_artifact(self, sandbox, *, path=None, include=None, exclude=None, orphans=True, update_mtimes=None):
"""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 (:class:`.Sandbox`): The build sandbox
path (str): An optional sandbox relative path
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
update_mtimes (list): An optional list of files whose mtimes to set to the current time.
Raises:
(:class:`.ElementError`): If the element has not yet produced an artifact.
Returns:
(:class:`~.utils.FileListResult`): 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 update_mtimes is None:
update_mtimes = []
# Time to use the artifact, check once more that it's there
self.__assert_cached()
with self.timed_activity("Staging {}/{}".format(self.name, self.__get_brief_display_key())):
# Get the extracted artifact
artifact_base, _ = self.__extract()
artifact = os.path.join(artifact_base, 'files')
# Hard link it into the staging area
#
basedir = sandbox.get_directory()
stagedir = basedir \
if path is None \
else os.path.join(basedir, path.lstrip(os.sep))
files = list(self.__compute_splits(include, exclude, orphans))
# We must not hardlink files whose mtimes we want to update
if update_mtimes:
link_files = [f for f in files if f not in update_mtimes]
copy_files = [f for f in files if f in update_mtimes]
else:
link_files = files
copy_files = []
link_result = utils.link_files(artifact, stagedir, files=link_files,
report_written=True)
copy_result = utils.copy_files(artifact, stagedir, files=copy_files,
report_written=True)
cur_time = time.time()
for f in copy_result.files_written:
os.utime(os.path.join(stagedir, f), times=(cur_time, cur_time))
return link_result.combine(copy_result)
def stage_dependency_artifacts(self, sandbox, scope, *, path=None,
include=None, exclude=None, orphans=True):
"""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 (:class:`.Sandbox`): The build sandbox
scope (:class:`.Scope`): The scope to stage dependencies in
path (str): An optional sandbox relative path
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
Raises:
(:class:`.ElementError`): If any of the dependencies in `scope` have not
yet produced artifacts, or if forbidden overlaps
occur.
"""
ignored = {}
overlaps = OrderedDict()
files_written = {}
old_dep_keys = {}
workspace = self._get_workspace()
if self.__can_build_incrementally() and workspace.last_successful:
old_dep_keys = self.__get_artifact_metadata_dependencies(workspace.last_successful)
for dep in self.dependencies(scope):
# If we are workspaced, and we therefore perform an
# incremental build, we must ensure that we update the mtimes
# of any files created by our dependencies since the last
# successful build.
to_update = None
if workspace and old_dep_keys:
dep.__assert_cached()
if dep.name in old_dep_keys:
key_new = dep._get_cache_key()
key_old = old_dep_keys[dep.name]
# We only need to worry about modified and added
# files, since removed files will be picked up by
# build systems anyway.
to_update, _, added = self.__artifacts.diff(dep, key_old, key_new, subdir='files')
workspace.add_running_files(dep.name, to_update + added)
to_update.extend(workspace.running_files[dep.name])
# In case we are running `bst shell`, this happens in the
# main process and we need to update the workspace config
if utils._is_main_process():
self._get_context().get_workspaces().save_config()
result = dep.stage_artifact(sandbox,
path=path,
include=include,
exclude=exclude,
orphans=orphans,
update_mtimes=to_update)
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_error = overlap_warning = False
error_detail = warning_detail = "Staged files overwrite existing files in staging area:\n"
for f, elements in overlaps.items():
overlap_error_elements = []
overlap_warning_elements = []
# The bottom item overlaps nothing
overlapping_elements = elements[1:]
for elm in overlapping_elements:
element = self.search(scope, elm)
element_project = element._get_project()
if not element.__file_is_whitelisted(f):
if element_project.fail_on_overlap:
overlap_error_elements.append(elm)
overlap_error = True
else:
overlap_warning_elements.append(elm)
overlap_warning = True
warning_detail += _overlap_error_detail(f, overlap_warning_elements, elements)
error_detail += _overlap_error_detail(f, overlap_error_elements, elements)
if overlap_warning:
self.warn("Non-whitelisted overlaps detected", detail=warning_detail)
if overlap_error:
raise ElementError("Non-whitelisted overlaps detected and fail-on-overlaps is set",
detail=error_detail, reason="overlap-error")
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):
"""Integrate currently staged filesystem against this artifact.
Args:
sandbox (:class:`.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:
commands = self.node_get_member(bstdata, list, 'integration-commands', [])
for i in range(len(commands)):
cmd = self.node_subst_list_element(bstdata, 'integration-commands', [i])
self.status("Running integration command", detail=cmd)
exitcode = sandbox.run(['sh', '-e', '-c', cmd], 0, env=environment, cwd='/')
if exitcode != 0:
raise ElementError("Command '{}' failed with exitcode {}".format(cmd, exitcode))
def stage_sources(self, sandbox, directory):
"""Stage this element's sources to a directory in the sandbox
Args:
sandbox (:class:`.Sandbox`): The build sandbox
directory (str): An absolute path within the sandbox to stage the sources at
"""
# Hold on to the location where a plugin decided to stage sources,
# this will be used to reconstruct the failed sysroot properly
# after a failed build.
#
assert self.__staged_sources_directory is None
self.__staged_sources_directory = directory
self._stage_sources_in_sandbox(sandbox, directory)
def get_public_data(self, domain):
"""Fetch public data on this element
Args:
domain (str): A public domain name to fetch data for
Returns:
(dict): The public data dictionary for the given domain
.. 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()
data = self.__dynamic_public.get(domain)
if data is not None:
data = _yaml.node_copy(data)
return data
def set_public_data(self, domain, data):
"""Set public data on this element
Args:
domain (str): A public domain name to fetch data for
data (dict): 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 = _yaml.node_copy(data)
self.__dynamic_public[domain] = data
def get_environment(self):
"""Fetch the environment suitable for running in the sandbox
Returns:
(dict): A dictionary of string key/values suitable for passing
to :func:`Sandbox.run() <buildstream.sandbox.Sandbox.run>`
"""
return _yaml.node_sanitize(self.__environment)
def get_variable(self, varname):
"""Fetch the value of a variable resolved for this element.
Args:
varname (str): The name of the variable to fetch
Returns:
(str): The resolved value for *varname*, or None if no
variable was declared with the given name.
"""
if varname in self.__variables.variables:
return self.__variables.variables[varname]
return None
#############################################################
# Private Methods used in BuildStream #
#############################################################
# _new_from_meta():
#
# Recursively instantiate a new Element instance, it's sources
# and it's dependencies from a meta element.
#
# Args:
# artifacts (ArtifactCache): The artifact cache
# meta (MetaElement): The meta element
#
# Returns:
# (Element): A newly created Element instance
#
@classmethod
def _new_from_meta(cls, meta, artifacts):
if meta in cls.__instantiated_elements:
return cls.__instantiated_elements[meta]
project = meta.project
element = project.create_element(artifacts, meta)
cls.__instantiated_elements[meta] = element
# Instantiate sources
for meta_source in meta.sources:
source = project.create_source(meta_source)
redundant_ref = source._load_ref()
element.__sources.append(source)
# Collect redundant refs which occurred at load time
if redundant_ref is not None:
cls.__redundant_source_refs.append((source, redundant_ref))
# Instantiate dependencies
for meta_dep in meta.dependencies:
dependency = Element._new_from_meta(meta_dep, artifacts)
element.__runtime_dependencies.append(dependency)
for meta_dep in meta.build_dependencies:
dependency = Element._new_from_meta(meta_dep, artifacts)
element.__build_dependencies.append(dependency)
return element
# _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 = []
# _get_consistency()
#
# Returns cached consistency state
#
def _get_consistency(self):
return self.__consistency
# _cached():
#
# Returns:
# (bool): Whether this element is already present in
# the artifact cache
#
def _cached(self):
return self.__cached
# _buildable():
#
# Returns:
# (bool): Whether this element can currently be built
#
def _buildable(self):
if self._get_consistency() != Consistency.CACHED:
return False
for dependency in self.dependencies(Scope.BUILD):
# In non-strict mode an element's strong cache key may not be available yet
# even though an artifact is available in the local cache. This can happen
# if the pull job is still pending as the remote cache may have an artifact
# that matches the strict cache key, which is preferred over a locally
# cached artifact with a weak cache key match.
if not dependency._cached() or not dependency._get_cache_key(strength=_KeyStrength.STRONG):
return False
if not self.__assemble_scheduled:
return False
return True
# _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):
# If build has already been scheduled, we know that the element is
# not cached and thus can allow cache query even if the strict cache key
# is not available yet.
# This special case is required for workspaced elements to prevent
# them from getting blocked in the pull queue.
if self.__assemble_scheduled:
return True
# cache cannot be queried until strict cache key is available
return self.__strict_cache_key is not None
# _update_state()
#
# Keep track of element state. Calculate cache keys if possible and
# check whether artifacts are cached.
#
# This must be called whenever the state of an element may have changed.
#
def _update_state(self):
context = self._get_context()
# Compute and determine consistency of sources
self.__update_source_state()
if self._get_consistency() == Consistency.INCONSISTENT:
# Tracking may still be pending
return
if self._get_workspace() and self.__assemble_scheduled:
# If we have an active workspace and are going to build, then
# discard current cache key values as their correct values can only
# be calculated once the build is complete
self.__cache_key_dict = None
self.__cache_key = None
self.__weak_cache_key = None
self.__strict_cache_key = None
self.__strong_cached = None
return
if self.__weak_cache_key is None:
# Calculate weak cache key
# Weak cache key includes names of direct build dependencies
# but does not include keys of dependencies.
if self.BST_STRICT_REBUILD:
dependencies = [
e._get_cache_key(strength=_KeyStrength.WEAK)
for e in self.dependencies(Scope.BUILD)
]
else:
dependencies = [
e.name for e in self.dependencies(Scope.BUILD, recurse=False)
]
self.__weak_cache_key = self.__calculate_cache_key(dependencies)
if self.__weak_cache_key is None:
# Weak cache key could not be calculated yet
return
if not context.get_strict():
# Full cache query in non-strict mode requires both the weak and
# strict cache keys. However, we need to determine as early as
# possible whether a build is pending to discard unstable cache keys
# for workspaced elements. For this cache check the weak cache keys
# are sufficient. However, don't update the `cached` attributes
# until the full cache query below.
cached = self.__artifacts.contains(self, self.__weak_cache_key)
if (not self.__assemble_scheduled and not self.__assemble_done and
not cached and not self._pull_pending() and self._is_required()):
self._schedule_assemble()
return
if self.__strict_cache_key is None:
dependencies = [
e.__strict_cache_key for e in self.dependencies(Scope.BUILD)
]
self.__strict_cache_key = self.__calculate_cache_key(dependencies)
if self.__strict_cache_key is None:
# Strict cache key could not be calculated yet
return
# Query caches now that the weak and strict cache keys are available
key_for_cache_lookup = self.__strict_cache_key if context.get_strict() else self.__weak_cache_key
if not self.__cached:
self.__cached = self.__artifacts.contains(self, key_for_cache_lookup)
if not self.__strong_cached:
self.__strong_cached = self.__artifacts.contains(self, self.__strict_cache_key)
if (not self.__assemble_scheduled and not self.__assemble_done and
not self.__cached and not self._pull_pending() and self._is_required()):
# Workspaced sources are considered unstable if a build is pending
# as the build will modify the contents of the workspace.
# Determine as early as possible if a build is pending to discard
# unstable cache keys.
self._schedule_assemble()
return
if self.__cache_key is None:
# Calculate strong cache key
if context.get_strict():
self.__cache_key = self.__strict_cache_key
elif 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.__get_artifact_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._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
# _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 self._get_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)
# _preflight():
#
# A wrapper for calling the abstract preflight() method on
# the element and it's 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) from e
# Preflight the sources
for source in self.sources():
source._preflight()
# _schedule_tracking():
#
# Force an element state to be inconsistent. Any sources appear to be
# inconsistent.
#
# This is used across the pipeline in sessions where the
# elements in question are going to be tracked, causing the
# pipeline to rebuild safely by ensuring cache key recalculation
# and reinterrogation of element state after tracking of elements
# succeeds.
#
def _schedule_tracking(self):
self.__tracking_scheduled = True
self._update_state()
# _tracking_done():
#
# This is called in the main process after the element has been tracked
#
def _tracking_done(self):
assert self.__tracking_scheduled
self.__tracking_scheduled = False
self.__tracking_done = True
self._update_state()
# _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):
refs = []
for source in self.__sources:
old_ref = source.get_ref()
new_ref = source._track()
refs.append((source._get_unique_id(), new_ref))
# Complimentary warning that the new ref will be unused.
if old_ref != new_ref and self._get_workspace():
detail = "This source has an open workspace.\n" \
+ "To start using the new reference, please close the existing workspace."
source.warn("Updated reference will be ignored as source has open workspace", detail=detail)
return refs
# _prepare_sandbox():
#
# This stages things for either _shell() (below) or also
# is used to stage things by the `bst checkout` codepath
#
@contextmanager
def _prepare_sandbox(self, scope, directory, deps='run', integrate=True):
with self.__sandbox(directory, config=self.__sandbox_config) as sandbox:
# Configure always comes first, and we need it.
self.configure_sandbox(sandbox)
# Stage something if we need it
if not directory:
if scope == Scope.BUILD:
self.stage(sandbox)
elif scope == Scope.RUN:
# Stage deps in the sandbox root
if deps == 'run':
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
# mount_workspaces (bool): mount workspaces if True, copy otherwise
#
def _stage_sources_in_sandbox(self, sandbox, directory, mount_workspaces=True):
# Only artifact caches that implement diff() are allowed to
# perform incremental builds.
if mount_workspaces and self.__can_build_incrementally():
workspace = self._get_workspace()
sandbox.mark_directory(directory)
sandbox._set_mount_source(directory, workspace.get_absolute_path())
# Stage all sources that need to be copied
sandbox_root = sandbox.get_directory()
host_directory = os.path.join(sandbox_root, directory.lstrip(os.sep))
self._stage_sources_at(host_directory, mount_workspaces=mount_workspaces)
# _stage_sources_at():
#
# Stage this element's sources to a directory
#
# Args:
# directory (str): An absolute path to stage the sources at
# mount_workspaces (bool): mount workspaces if True, copy otherwise
#
def _stage_sources_at(self, directory, mount_workspaces=True):
with self.timed_activity("Staging sources", silent_nested=True):
if os.path.isdir(directory) and os.listdir(directory):
raise ElementError("Staging directory '{}' is not empty".format(directory))
workspace = self._get_workspace()
if workspace:
# If mount_workspaces is set and we're doing incremental builds,
# the workspace is already mounted into the sandbox.
if not (mount_workspaces and self.__can_build_incrementally()):
with self.timed_activity("Staging local files at {}".format(workspace.path)):
workspace.stage(directory)
else:
# No workspace, stage directly
for source in self.sources():
source._stage(directory)
# Ensure deterministic mtime of sources at build time
utils._set_deterministic_mtime(directory)
# Ensure deterministic owners of sources at build time
utils._set_deterministic_user(directory)
# _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()
self._update_state()
# _is_required():
#
# Returns whether this element has been marked as required.
#
def _is_required(self):
return self.__required
# _schedule_assemble():
#
# This is called in the main process before the element is assembled
# in a subprocess.
#
def _schedule_assemble(self):
assert self._is_required()
assert not self.__assemble_scheduled
self.__assemble_scheduled = True
# Requests artifacts of build dependencies
for dep in self.dependencies(Scope.BUILD, recurse=False):
dep._set_required()
# Invalidate workspace key as the build modifies the workspace directory
workspace = self._get_workspace()
if workspace:
workspace.invalidate_key()
self._update_state()
# _assemble_done():
#
# This is called in the main process after the element has been assembled
# and in the a subprocess after assembly completes.
#
# This will result in updating the element state.
#
def _assemble_done(self):
assert self.__assemble_scheduled
self.__assemble_scheduled = False
self.__assemble_done = True
self._update_state()
if self._get_workspace() and self._cached():
#
# Note that this block can only happen in the
# main process, since `self._cached()` cannot
# be true when assembly is completed 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_successful = key
workspace.clear_running_files()
self._get_context().get_workspaces().save_config()
# We also need to update the required artifacts, since
# workspaced dependencies do not have a fixed cache key
# when the build starts.
#
# This does *not* cause a race condition, because
# _assemble_done is called before a cleanup job may be
# launched.
#
self.__artifacts.append_required_artifacts([self])
# _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
#
def _assemble(self):
# Assert call ordering
assert not self._cached()
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)
rootdir = tempfile.mkdtemp(prefix="{}-".format(self.normal_name), dir=context.builddir)
# Cleanup the build directory on explicit SIGTERM
def cleanup_rootdir():
utils._force_rmtree(rootdir)
with _signals.terminator(cleanup_rootdir), \
self.__sandbox(rootdir, output_file, output_file, self.__sandbox_config) as sandbox: # nopep8
sandbox_root = sandbox.get_directory()
# 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 = _yaml.node_copy(self.__public)
# Call the abstract plugin methods
try:
# Step 1 - Configure
self.configure_sandbox(sandbox)
# Step 2 - Stage
self.stage(sandbox)
# Step 3 - Prepare
self.__prepare(sandbox)
# Step 4 - Assemble
collect = self.assemble(sandbox)
except BstError as e:
# If an error occurred assembling an element in a sandbox,
# then tack on the sandbox directory to the error
e.sandbox = rootdir
# If there is a workspace open on this element, it will have
# been mounted for sandbox invocations instead of being staged.
#
# In order to preserve the correct failure state, we need to
# copy over the workspace files into the appropriate directory
# in the sandbox.
#
workspace = self._get_workspace()
if workspace and self.__staged_sources_directory:
sandbox_root = sandbox.get_directory()
sandbox_path = os.path.join(sandbox_root,
self.__staged_sources_directory.lstrip(os.sep))
try:
utils.copy_files(workspace.path, sandbox_path)
except UtilError as e:
self.warn("Failed to preserve workspace state for failed build sysroot: {}"
.format(e))
raise
collectdir = os.path.join(sandbox_root, collect.lstrip(os.sep))
if not os.path.exists(collectdir):
raise ElementError(
"Directory '{}' was not found inside the sandbox, "
"unable to collect artifact contents"
.format(collect))
# At this point, we expect an exception was raised leading to
# an error message, or we have good output to collect.
# Create artifact directory structure
assembledir = os.path.join(rootdir, 'artifact')
filesdir = os.path.join(assembledir, 'files')
logsdir = os.path.join(assembledir, 'logs')
metadir = os.path.join(assembledir, 'meta')
os.mkdir(assembledir)
os.mkdir(filesdir)
os.mkdir(logsdir)
os.mkdir(metadir)
# Hard link files from collect dir to files directory
utils.link_files(collectdir, filesdir)
# Copy build log
if self.__log_path:
shutil.copyfile(self.__log_path, os.path.join(logsdir, 'build.log'))
# Store public data
_yaml.dump(_yaml.node_sanitize(self.__dynamic_public), os.path.join(metadir, 'public.yaml'))
# ensure we have cache keys
self._assemble_done()
# Store keys.yaml
_yaml.dump(_yaml.node_sanitize({
'strong': self._get_cache_key(),
'weak': self._get_cache_key(_KeyStrength.WEAK),
}), os.path.join(metadir, 'keys.yaml'))
# Store dependencies.yaml
_yaml.dump(_yaml.node_sanitize({
e.name: e._get_cache_key() for e in self.dependencies(Scope.BUILD)
}), os.path.join(metadir, 'dependencies.yaml'))
# Store workspaced.yaml
_yaml.dump(_yaml.node_sanitize({
'workspaced': True if self._get_workspace() else False
}), os.path.join(metadir, 'workspaced.yaml'))
# Store workspaced-dependencies.yaml
_yaml.dump(_yaml.node_sanitize({
'workspaced-dependencies': [
e.name for e in self.dependencies(Scope.BUILD)
if e._get_workspace()
]
}), os.path.join(metadir, 'workspaced-dependencies.yaml'))
with self.timed_activity("Caching artifact"):
self.__artifact_size = utils._get_dir_size(assembledir)
self.__artifacts.commit(self, assembledir, self.__get_cache_keys_for_commit())
# Finally cleanup the build dir
cleanup_rootdir()
# _pull_pending()
#
# Check whether the artifact will be pulled.
#
# Returns:
# (bool): Whether a pull operation is pending
#
def _pull_pending(self):
if self.__strong_cached:
# Artifact already in local cache
return False
# Pull is pending if artifact remote server available
# and pull has not been attempted yet
return self.__artifacts.has_fetch_remotes(element=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
self._update_state()
def _pull_strong(self, *, progress=None):
weak_key = self._get_cache_key(strength=_KeyStrength.WEAK)
key = self.__strict_cache_key
if not self.__artifacts.pull(self, key, progress=progress):
return False
# update weak ref by pointing it to this newly fetched artifact
self.__artifacts.link_key(self, key, weak_key)
return True
def _pull_weak(self, *, progress=None):
weak_key = self._get_cache_key(strength=_KeyStrength.WEAK)
if not self.__artifacts.pull(self, weak_key, progress=progress):
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
# _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()
def progress(percent, message):
self.status(message)
# Attempt to pull artifact without knowing whether it's available
pulled = self._pull_strong(progress=progress)
if not pulled and not self._cached() and not context.get_strict():
pulled = self._pull_weak(progress=progress)
if not pulled:
return False
# Notify successfull download
display_key = self.__get_brief_display_key()
self.info("Downloaded artifact {}".format(display_key))
return True
# _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(element=self):
# No push remotes for this element's project
return True
if not self._cached():
return True
# Do not push tained 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
with self.timed_activity("Pushing artifact"):
# Push all keys used for local commit
pushed = self.__artifacts.push(self, self.__get_cache_keys_for_commit())
if not pushed:
return False
# Notify successful upload
display_key = self.__get_brief_display_key()
self.info("Pushed artifact {}".format(display_key))
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
# directory (str): A directory to an existing sandbox, 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
#
# Returns: Exit code
#
# If directory is not specified, one will be staged using scope
def _shell(self, scope=None, directory=None, *, mounts=None, isolate=False, prompt=None, command=None):
with self._prepare_sandbox(scope, directory) 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 _yaml.node_items(shell_environment):
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 = [arg for arg in 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:
for source in self.sources():
source._init_workspace(temp)
# Now hardlink the files into the workspace target.
utils.link_files(temp, workspace.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())
# _get_artifact_size()
#
# Get the size of the artifact produced by this element in the
# current pipeline - if this element has not been assembled or
# pulled, this will be None.
#
# Note that this is the size of an artifact *before* committing it
# to the cache, the size on disk may differ. It can act as an
# approximate guide for when to do a proper size calculation.
#
# Returns:
# (int|None): The size of the artifact
#
def _get_artifact_size(self):
return self.__artifact_size
def _get_artifact_cache(self):
return self.__artifacts
# _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)
# _subst_string()
#
# Substitue a string, this is an internal function related
# to how junctions are loaded and needs to be more generic
# than the public node_subst_member()
#
# Args:
# value (str): A string value
#
# Returns:
# (str): The string after substitutions have occurred
#
def _subst_string(self, value):
return self.__variables.subst(value)
# Run some element methods with logging directed to
# a dedicated log file, here we yield the filename
# we decided on for logging
#
@contextmanager
def _logging_enabled(self, action_name):
self.__log_path = self.__logfile(action_name)
with open(self.__log_path, 'a') as logfile:
# Write one last line to the log and flush it to disk
def flush_log():
# If the process currently had something happening in the I/O stack
# then trying to reenter the I/O stack will fire a runtime error.
#
# So just try to flush as well as we can at SIGTERM time
try:
logfile.write('\n\nAction {} for element {} forcefully terminated\n'
.format(action_name, self.name))
logfile.flush()
except RuntimeError:
os.fsync(logfile.fileno())
self._set_log_handle(logfile)
with _signals.terminator(flush_log):
yield self.__log_path
self._set_log_handle(None)
self.__log_path = None
# Override plugin _set_log_handle(), set it for our sources and dependencies too
#
# A log handle is set once in the context of a child task which will have only
# one log, so it's not harmful to modify the state of dependencies
def _set_log_handle(self, logfile, recurse=True):
super()._set_log_handle(logfile)
for source in self.sources():
source._set_log_handle(logfile)
if recurse:
for dep in self.dependencies(Scope.ALL):
dep._set_log_handle(logfile, False)
# 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
#############################################################
# Private Local Methods #
#############################################################
# __update_source_state()
#
# Updates source consistency state
#
def __update_source_state(self):
# Cannot resolve source state until tracked
if self.__tracking_scheduled:
return
self.__consistency = Consistency.CACHED
workspace = self._get_workspace()
# Special case for workspaces
if workspace:
# A workspace is considered inconsistent in the case
# that it's directory went missing
#
fullpath = workspace.get_absolute_path()
if not os.path.exists(fullpath):
self.__consistency = Consistency.INCONSISTENT
else:
# Determine overall consistency of the element
for source in self.__sources:
source._update_state()
source_consistency = source._get_consistency()
self.__consistency = min(self.__consistency, source_consistency)
# __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.node_items(self.__environment)
if key not in self.__env_nocache
}
context = self._get_context()
project = self._get_project()
workspace = self._get_workspace()
self.__cache_key_dict = {
'artifact-version': "{}.{}".format(BST_CORE_ARTIFACT_VERSION,
self.BST_ARTIFACT_VERSION),
'context': context.get_cache_key(),
'project': project.get_cache_key(),
'element': self.get_unique_key(),
'execution-environment': self.__sandbox_config.get_unique_key(),
'environment': cache_env,
'sources': [s._get_unique_key(workspace is None) for s in self.__sources],
'workspace': '' if workspace is None else workspace.get_key(self._get_project()),
'public': self.__public,
'cache': type(self.__artifacts).__name__
}
# fail-on-overlap setting cannot affect elements without dependencies
if project.fail_on_overlap and dependencies:
self.__cache_key_dict['fail-on-overlap'] = True
cache_key_dict = self.__cache_key_dict.copy()
cache_key_dict['dependencies'] = dependencies
return _cachekey.generate_key(cache_key_dict)
# __can_build_incrementally()
#
# Check if the element can be built incrementally, this
# is used to decide how to stage things
#
# Returns:
# (bool): Whether this element can be built incrementally
#
def __can_build_incrementally(self):
return bool(self._get_workspace())
# __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
# __prepare():
#
# Internal method for calling public abstract prepare() method.
#
def __prepare(self, sandbox):
workspace = self._get_workspace()
# We need to ensure that the prepare() method is only called
# once in workspaces, because the changes will persist across
# incremental builds - not desirable, for example, in the case
# of autotools' `./configure`.
if not (workspace and workspace.prepared):
self.prepare(sandbox)
if workspace:
workspace.prepared = True
# __logfile()
#
# Compose the log file for this action & pid.
#
# Args:
# action_name (str): The action name
# pid (int): Optional pid, current pid is assumed if not provided.
#
# Returns:
# (string): The log file full path
#
# Log file format, when there is a cache key, is:
#
# '{logdir}/{project}/{element}/{cachekey}-{action}.{pid}.log'
#
# Otherwise, it is:
#
# '{logdir}/{project}/{element}/{:0<64}-{action}.{pid}.log'
#
# This matches the order in which things are stored in the artifact cache
#
def __logfile(self, action_name, pid=None):
project = self._get_project()
context = self._get_context()
key = self.__get_brief_display_key()
if pid is None:
pid = os.getpid()
action = action_name.lower()
logfile = "{key}-{action}.{pid}.log".format(
key=key, action=action, pid=pid)
directory = os.path.join(context.logdir, project.name, self.normal_name)
os.makedirs(directory, exist_ok=True)
return os.path.join(directory, logfile)
# __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.__get_artifact_metadata_workspaced()
# Whether this artifact's dependencies have workspaces
workspaced_dependencies = self.__get_artifact_metadata_workspaced_dependencies()
# Other conditions should be or-ed
self.__tainted = workspaced or workspaced_dependencies
return self.__tainted
# __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
#
# Yields:
# (Sandbox): A usable sandbox
#
@contextmanager
def __sandbox(self, directory, stdout=None, stderr=None, config=None):
context = self._get_context()
project = self._get_project()
platform = Platform.get_platform()
if directory is not None and os.path.exists(directory):
sandbox = platform.create_sandbox(context, project,
directory,
stdout=stdout,
stderr=stderr,
config=config)
yield sandbox
else:
os.makedirs(context.builddir, exist_ok=True)
rootdir = tempfile.mkdtemp(prefix="{}-".format(self.normal_name), dir=context.builddir)
# Recursive contextmanager...
with self.__sandbox(rootdir, stdout=stdout, stderr=stderr, config=config) as sandbox:
yield sandbox
# Cleanup the build dir
utils._force_rmtree(rootdir)
def __compose_default_splits(self, defaults):
project = self._get_project()
project_splits = _yaml.node_chain_copy(project._splits)
element_public = _yaml.node_get(defaults, Mapping, 'public', default_value={})
element_bst = _yaml.node_get(element_public, Mapping, 'bst', default_value={})
element_splits = _yaml.node_get(element_bst, Mapping, 'split-rules', default_value={})
# Extend project wide split rules with any split rules defined by the element
_yaml.composite(project_splits, element_splits)
element_bst['split-rules'] = project_splits
element_public['bst'] = element_bst
defaults['public'] = element_public
def __init_defaults(self, plugin_conf):
# Defaults are loaded once per class and then reused
#
if not self.__defaults_set:
# Load the plugin's accompanying .yaml file if one was provided
defaults = {}
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
self.__compose_default_splits(defaults)
# Override the element's defaults with element specific
# overrides from the project.conf
project = self._get_project()
elements = project.element_overrides
overrides = elements.get(self.get_kind())
if overrides:
_yaml.composite(defaults, overrides)
# Set the data class wide
type(self).__defaults = defaults
type(self).__defaults_set = True
# This will resolve the final environment to be used when
# creating sandboxes for this element
#
def __extract_environment(self, meta):
project = self._get_project()
default_env = _yaml.node_get(self.__defaults, Mapping, 'environment', default_value={})
environment = _yaml.node_chain_copy(project.base_environment)
_yaml.composite(environment, default_env)
_yaml.composite(environment, meta.environment)
_yaml.node_final_assertions(environment)
# Resolve variables in environment value strings
final_env = {}
for key, _ in self.node_items(environment):
final_env[key] = self.node_subst_member(environment, key)
return final_env
def __extract_env_nocache(self, meta):
project = self._get_project()
project_nocache = project.base_env_nocache
default_nocache = _yaml.node_get(self.__defaults, list, 'environment-nocache', default_value=[])
element_nocache = meta.env_nocache
# 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
#
def __extract_variables(self, meta):
project = self._get_project()
default_vars = _yaml.node_get(self.__defaults, Mapping, 'variables', default_value={})
variables = _yaml.node_chain_copy(project.base_variables)
_yaml.composite(variables, default_vars)
_yaml.composite(variables, meta.variables)
_yaml.node_final_assertions(variables)
return variables
# This will resolve the final configuration to be handed
# off to element.configure()
#
def __extract_config(self, meta):
# The default config is already composited with the project overrides
config = _yaml.node_get(self.__defaults, Mapping, 'config', default_value={})
config = _yaml.node_chain_copy(config)
_yaml.composite(config, meta.config)
_yaml.node_final_assertions(config)
return config
# Sandbox-specific configuration data, to be passed to the sandbox's constructor.
#
def __extract_sandbox_config(self, meta):
project = self._get_project()
# The default config is already composited with the project overrides
sandbox_defaults = _yaml.node_get(self.__defaults, Mapping, 'sandbox', default_value={})
sandbox_defaults = _yaml.node_chain_copy(sandbox_defaults)
sandbox_config = _yaml.node_chain_copy(project._sandbox)
_yaml.composite(sandbox_config, sandbox_defaults)
_yaml.composite(sandbox_config, meta.sandbox)
_yaml.node_final_assertions(sandbox_config)
# Sandbox config, unlike others, has fixed members so we should validate them
_yaml.node_validate(sandbox_config, ['build-uid', 'build-gid'])
return SandboxConfig(self.node_get_member(sandbox_config, int, 'build-uid'),
self.node_get_member(sandbox_config, int, 'build-gid'))
# This makes a special exception for the split rules, which
# elements may extend but whos defaults are defined in the project.
#
def __extract_public(self, meta):
base_public = _yaml.node_get(self.__defaults, Mapping, 'public', default_value={})
base_public = _yaml.node_chain_copy(base_public)
base_bst = _yaml.node_get(base_public, Mapping, 'bst', default_value={})
base_splits = _yaml.node_get(base_bst, Mapping, 'split-rules', default_value={})
element_public = _yaml.node_chain_copy(meta.public)
element_bst = _yaml.node_get(element_public, Mapping, 'bst', default_value={})
element_splits = _yaml.node_get(element_bst, Mapping, 'split-rules', default_value={})
# Allow elements to extend the default splits defined in their project or
# element specific defaults
_yaml.composite(base_splits, element_splits)
element_bst['split-rules'] = base_splits
element_public['bst'] = element_bst
_yaml.node_final_assertions(element_public)
# Also, resolve any variables in the public split rules directly
for domain, splits in self.node_items(base_splits):
base_splits[domain] = [
self.__variables.subst(split.strip())
for split in splits
]
return element_public
def __init_splits(self):
bstdata = self.get_public_data('bst')
splits = bstdata.get('split-rules')
self.__splits = {
domain: re.compile('^(?:' + '|'.join([utils._glob2re(r) for r in rules]) + ')$')
for domain, rules in self.node_items(splits)
}
def __compute_splits(self, include=None, exclude=None, orphans=True):
artifact_base, _ = self.__extract()
basedir = os.path.join(artifact_base, 'files')
# No splitting requested, just report complete artifact
if orphans and not (include or exclude):
for filename in utils.list_relative_paths(basedir):
yield filename
return
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]
# FIXME: Instead of listing the paths in an extracted artifact,
# we should be using a manifest loaded from the artifact
# metadata.
#
element_files = [
os.path.join(os.sep, filename)
for filename in utils.list_relative_paths(basedir)
]
for filename in element_files:
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
if include_file and not exclude_file:
yield filename.lstrip(os.sep)
def __file_is_whitelisted(self, pattern):
# 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 = _yaml.node_get(bstdata, list, 'overlap-whitelist', default_value=[])
whitelist_expressions = [utils._glob2re(self.__variables.subst(exp.strip())) for exp in whitelist]
expression = ('^(?:' + '|'.join(whitelist_expressions) + ')$')
self.__whitelist_regex = re.compile(expression)
return self.__whitelist_regex.match(pattern)
# __extract():
#
# Extract an artifact and return the directory
#
# Args:
# key (str): The key for the artifact to extract,
# or None for the default key
#
# Returns:
# (str): The path to the extracted artifact
# (str): The chosen key
#
def __extract(self, key=None):
if key is None:
context = self._get_context()
key = self.__strict_cache_key
# Use weak cache key, if artifact is missing for strong cache key
# and the context allows use of weak cache keys
if not context.get_strict() and not self.__artifacts.contains(self, key):
key = self._get_cache_key(strength=_KeyStrength.WEAK)
return (self.__artifacts.extract(self, key), key)
# __get_artifact_metadata_keys():
#
# Retrieve the strong and weak keys from the given artifact.
#
# Args:
# key (str): The artifact key, or None for the default key
#
# Returns:
# (str): The strong key
# (str): The weak key
#
def __get_artifact_metadata_keys(self, key=None):
# Now extract it and possibly derive the key
artifact_base, key = self.__extract(key)
# Now try the cache, once we're sure about the key
if key in self.__metadata_keys:
return (self.__metadata_keys[key]['strong'],
self.__metadata_keys[key]['weak'])
# Parse the expensive yaml now and cache the result
meta_file = os.path.join(artifact_base, 'meta', 'keys.yaml')
meta = _yaml.load(meta_file)
strong_key = meta['strong']
weak_key = meta['weak']
assert key == strong_key or key == weak_key
self.__metadata_keys[strong_key] = meta
self.__metadata_keys[weak_key] = meta
return (strong_key, weak_key)
# __get_artifact_metadata_dependencies():
#
# Retrieve the hash of dependency strong keys from the given artifact.
#
# Args:
# key (str): The artifact key, or None for the default key
#
# Returns:
# (dict): A dictionary of element names and their strong keys
#
def __get_artifact_metadata_dependencies(self, key=None):
# Extract it and possibly derive the key
artifact_base, key = self.__extract(key)
# Now try the cache, once we're sure about the key
if key in self.__metadata_dependencies:
return self.__metadata_dependencies[key]
# Parse the expensive yaml now and cache the result
meta_file = os.path.join(artifact_base, 'meta', 'dependencies.yaml')
meta = _yaml.load(meta_file)
# Cache it under both strong and weak keys
strong_key, weak_key = self.__get_artifact_metadata_keys(key)
self.__metadata_dependencies[strong_key] = meta
self.__metadata_dependencies[weak_key] = meta
return meta
# __get_artifact_metadata_workspaced():
#
# Retrieve the hash of dependency strong keys from the given artifact.
#
# Args:
# key (str): The artifact key, or None for the default key
#
# Returns:
# (bool): Whether the given artifact was workspaced
#
def __get_artifact_metadata_workspaced(self, key=None):
# Extract it and possibly derive the key
artifact_base, key = self.__extract(key)
# Now try the cache, once we're sure about the key
if key in self.__metadata_workspaced:
return self.__metadata_workspaced[key]
# Parse the expensive yaml now and cache the result
meta_file = os.path.join(artifact_base, 'meta', 'workspaced.yaml')
meta = _yaml.load(meta_file)
workspaced = meta['workspaced']
# Cache it under both strong and weak keys
strong_key, weak_key = self.__get_artifact_metadata_keys(key)
self.__metadata_workspaced[strong_key] = workspaced
self.__metadata_workspaced[weak_key] = workspaced
return workspaced
# __get_artifact_metadata_workspaced_dependencies():
#
# Retrieve the hash of dependency strong keys from the given artifact.
#
# Args:
# key (str): The artifact key, or None for the default key
#
# Returns:
# (list): List of which dependencies are workspaced
#
def __get_artifact_metadata_workspaced_dependencies(self, key=None):
# Extract it and possibly derive the key
artifact_base, key = self.__extract(key)
# Now try the cache, once we're sure about the key
if key in self.__metadata_workspaced_dependencies:
return self.__metadata_workspaced_dependencies[key]
# Parse the expensive yaml now and cache the result
meta_file = os.path.join(artifact_base, 'meta', 'workspaced-dependencies.yaml')
meta = _yaml.load(meta_file)
workspaced = meta['workspaced-dependencies']
# Cache it under both strong and weak keys
strong_key, weak_key = self.__get_artifact_metadata_keys(key)
self.__metadata_workspaced_dependencies[strong_key] = workspaced
self.__metadata_workspaced_dependencies[weak_key] = workspaced
return workspaced
# __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
# Load the public data from the artifact
artifact_base, _ = self.__extract()
metadir = os.path.join(artifact_base, 'meta')
self.__dynamic_public = _yaml.load(os.path.join(metadir, 'public.yaml'))
def __get_cache_keys_for_commit(self):
keys = []
# tag with strong cache key based on dependency versions used for the build
keys.append(self._get_cache_key(strength=_KeyStrength.STRONG))
# also store under weak cache key
keys.append(self._get_cache_key(strength=_KeyStrength.WEAK))
return utils._deduplicate(keys)
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 ""