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#!/usr/bin/env python3
# Copyright 2020 The ChromiumOS Authors
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.
"""Chroot helper functions."""
import os
from pathlib import Path
import subprocess
from typing import Iterable, List, Union
def InChroot() -> bool:
"""Returns True if currently in the chroot."""
return "CROS_WORKON_SRCROOT" in os.environ
def VerifyOutsideChroot() -> None:
"""Checks whether the script invoked was executed in the chroot.
Raises:
AssertionError: The script was run inside the chroot.
"""
assert not InChroot(), "Script should be run outside the chroot."
def VerifyChromeOSRoot(chromeos_root: Union[Path, str]) -> None:
"""Checks whether the path actually points to ChromiumOS checkout root.
Raises:
AssertionError: The path is not ChromiumOS checkout root.
"""
subdir = "src/third_party/chromiumos-overlay"
path = Path(chromeos_root).expanduser() / subdir
msg = f"Wrong ChromeOS path. No {subdir} directory in {chromeos_root} ."
assert path.is_dir(), msg
def GetChrootEbuildPaths(
chromeos_root: Union[Path, str], packages: Iterable[str]
) -> List[str]:
"""Gets the chroot path(s) of the package(s).
Args:
chromeos_root: The absolute path to the chroot to
use for executing chroot commands.
packages: A list of a package/packages to
be used to find their chroot path.
Returns:
A list of chroot paths of the packages' ebuild files.
Raises:
ValueError: Failed to get the chroot path of a package.
"""
chroot_paths = []
# Find the chroot path for each package's ebuild.
for package in packages:
chroot_path = subprocess.check_output(
["cros_sdk", "--", "equery", "w", package],
cwd=chromeos_root,
encoding="utf-8",
)
chroot_paths.append(chroot_path.strip())
return chroot_paths
def ConvertChrootPathsToAbsolutePaths(
chromeos_root: str,
chroot_paths: List[str],
) -> List[str]:
"""Converts the chroot path(s) to absolute symlink path(s).
Args:
chromeos_root: The absolute path to the chroot.
chroot_paths: A list of chroot paths to convert to absolute paths.
Returns:
A list of absolute path(s).
Raises:
ValueError: Invalid prefix for the chroot path or
invalid chroot paths were provided.
"""
abs_paths = []
chroot_prefix = "/mnt/host/source/"
# Iterate through the chroot paths.
# For each chroot file path, remove '/mnt/host/source/' prefix
# and combine the chroot path with the result and add it to the list.
for chroot_path in chroot_paths:
if not chroot_path.startswith(chroot_prefix):
raise ValueError(
"Invalid prefix for the chroot path: %s" % chroot_path
)
rel_path = chroot_path[len(chroot_prefix) :]
# combine the chromeos root path + '/src/...'
abs_path = os.path.join(chromeos_root, rel_path)
abs_paths.append(abs_path)
return abs_paths
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