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# Copyright 2020 The Chromium OS Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.
"""Encapsulation of a build configuration."""
import hashlib
import json
import pathlib
import zmake.jobserver
import zmake.util as util
class BuildConfig:
"""A container for build configurations.
A build config is a tuple of environment variables, cmake
variables, kconfig definitons, and kconfig files.
"""
def __init__(
self, environ_defs=None, cmake_defs=None, kconfig_defs=None, kconfig_files=None
):
self.environ_defs = dict(environ_defs or {})
self.cmake_defs = dict(cmake_defs or {})
self.kconfig_defs = dict(kconfig_defs or {})
def _remove_duplicate_paths(files):
# Remove multiple of the same kconfig file in a row.
result = []
for path in files:
if not result or path != result[-1]:
result.append(path)
return result
self.kconfig_files = _remove_duplicate_paths(kconfig_files or [])
def popen_cmake(
self,
jobclient: zmake.jobserver.JobClient,
project_dir,
build_dir,
kconfig_path=None,
**kwargs
):
"""Run Cmake with this config using a jobclient.
Args:
jobclient: A JobClient instance.
project_dir: The project directory.
build_dir: Directory to use for Cmake build.
kconfig_path: The path to write out Kconfig definitions.
kwargs: forwarded to popen.
"""
kconfig_files = list(self.kconfig_files)
if kconfig_path:
util.write_kconfig_file(kconfig_path, self.kconfig_defs)
kconfig_files.append(kconfig_path)
elif self.kconfig_defs:
raise ValueError(
"Cannot start Cmake on a config with Kconfig items without a "
"kconfig_path"
)
if kconfig_files:
base_config = BuildConfig(
environ_defs=self.environ_defs, cmake_defs=self.cmake_defs
)
conf_file_config = BuildConfig(
cmake_defs={
"CONF_FILE": ";".join(str(p.resolve()) for p in kconfig_files)
}
)
return (base_config | conf_file_config).popen_cmake(
jobclient, project_dir, build_dir, **kwargs
)
kwargs["env"] = dict(**kwargs.get("env", {}), **self.environ_defs)
return jobclient.popen(
[
"/usr/bin/cmake",
"-S",
project_dir,
"-B",
build_dir,
"-GNinja",
*("-D{}={}".format(*pair) for pair in self.cmake_defs.items()),
],
**kwargs
)
def __or__(self, other):
"""Combine two BuildConfig instances."""
if not isinstance(other, BuildConfig):
raise TypeError(
"Unsupported operation | for {} and {}".format(type(self), type(other))
)
return BuildConfig(
environ_defs=dict(**self.environ_defs, **other.environ_defs),
cmake_defs=dict(**self.cmake_defs, **other.cmake_defs),
kconfig_defs=dict(**self.kconfig_defs, **other.kconfig_defs),
kconfig_files=[*self.kconfig_files, *other.kconfig_files],
)
def __repr__(self):
return "BuildConfig({})".format(
", ".join(
"{}={!r}".format(name, getattr(self, name))
for name in [
"environ_defs",
"cmake_defs",
"kconfig_defs",
"kconfig_files",
]
if getattr(self, name)
)
)
def _get_paths_for_hashing(self):
# Zephyr's CMake system won't detect that CMake needs to be
# re-run to regenerate Kconfig headers or merge DTS files.
# We can work around this in Zmake by hashing the file
# contents of known problematic paths, and forcing a clobber
# when any hash is changed.
#
# TODO(b/215560602): Delete this code when Zephyr's Cmake
# system is fixed.
paths_for_hashing = set()
for path in self.cmake_defs.get("DTC_OVERLAY_FILE", "").split(";"):
if not path:
continue
paths_for_hashing.add(pathlib.Path(path).resolve())
for path in self.kconfig_files:
paths_for_hashing.add(path.resolve())
return paths_for_hashing
def _get_file_hashes(self):
result = {}
for path in self._get_paths_for_hashing():
result[str(path)] = hashlib.sha224(path.read_bytes()).hexdigest()
return result
def as_json(self):
"""Provide a stable JSON representation of the build config."""
return json.dumps(
{
"environ_defs": self.environ_defs,
"cmake_defs": self.cmake_defs,
"kconfig_defs": self.kconfig_defs,
"kconfig_files": [str(p.resolve()) for p in self.kconfig_files],
"file_hashes": self._get_file_hashes(),
},
sort_keys=True,
)
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