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# Copyright 2015 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.
"""Common utilities used by the chromium/bootstrap scripts."""
from __future__ import print_function
import os
from chromite.lib import cros_build_lib
from chromite.lib import project_sdk
from chromite.lib import workspace_lib
# This is the subdirectory of the bootstrap, where we store SDKs.
SDK_CHECKOUTS = 'sdk_checkouts'
# This env is used to remember the bootstrap path in child processes.
BOOTSTRAP_PATH_ENV = 'BRILLO_BOOTSTRAP_PATH'
def FindBootstrapPath(save_to_env=False):
"""Find the bootstrap directory.
This is only possible, if the process was initially launched from a bootstrap
environment, and isn't inside a chroot.
Args:
save_to_env: If true, preserve the bootstrap path in an ENV for child
processes. Only intended for the brillo bootstrap wrapper.
Returns:
Path to root of bootstrap, or None.
"""
# We never have access to bootstrap if we are inside the chroot.
if cros_build_lib.IsInsideChroot():
return None
# See if the path has already been determined, especially in a parent wrapper
# process.
env_path = os.environ.get(BOOTSTRAP_PATH_ENV)
if env_path:
return env_path
# Base the bootstrap location on our current location, and remember it.
new_path = os.path.realpath(os.path.join(
os.path.abspath(__file__), '..', '..'))
# No repo checkout is a valid bootstrap environment, because the bootstrap
# environment holds repo checkouts inside SDK_CHECKOUTS, and repos cannot
# exist inside other repos.
if project_sdk.FindRepoRoot(new_path):
return None
if save_to_env:
os.environ[BOOTSTRAP_PATH_ENV] = new_path
return new_path
def ComputeSdkPath(bootstrap_path, version):
"""What directory should an SDK be in.
Args:
bootstrap_path: Bootstrap root directory, or None.
version: Version of the SDK.
Returns:
Path in which SDK version should be stored, or None.
"""
if bootstrap_path is None:
return None
return os.path.join(bootstrap_path, SDK_CHECKOUTS, version)
def GetActiveSdkPath(bootstrap_path, workspace_path):
"""Find the SDK Path associated with a given workspace.
Most code should use constants.SOURCE_ROOT instead.
Args:
bootstrap_path: Path directory of the bootstrap dir (FindBootstrapPath()).
workspace_path: Path directory of the workspace (FindWorkspacePath()).
Returns:
Path to root directory of SDK, if there is an active one, and it exists.
"""
if bootstrap_path is None:
return None
version = workspace_lib.GetActiveSdkVersion(workspace_path)
if version is None:
return None
sdk_root = ComputeSdkPath(bootstrap_path, version)
# Returns None if there is no active SDK version, or if it's not installed.
return sdk_root if os.path.isdir(sdk_root) else None
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