"""Module for retrieving information about a Chromium checkout."""
import functools
import logging
import pathlib
import shutil
import subprocess
@functools.cache
def check_btrfs(root_path) -> bool:
"""Checks if the given path is on a btrfs partition.
Args:
root_path: The path to check.
Returns:
True if the given path can be verified to be on a btrfs partition,
otherwise False.
"""
result = subprocess.run(
['stat', '-c', '%i', root_path],
capture_output=True,
check=True,
)
inode_number = int(result.stdout.strip())
btrfs = inode_number == 256
logging.debug('btrfs (%d)' if btrfs else 'Not in btrfs (%d)', inode_number)
if not btrfs:
logging.warning(
'Warning: This is not running in a btrfs environment which will '
'lead to a much slower runtime. Please see the README.md for '
'btrfs setup instructions.')
return btrfs
@functools.cache
def get_gclient_root() -> pathlib.Path:
"""Retrieves the gclient root for the current checkout.
Returns:
A Path containing the absolute path to the gclient root for the current
checkout.
"""
result = subprocess.run(
['gclient', 'root'],
capture_output=True,
text=True,
check=True,
)
return pathlib.Path(result.stdout.strip())
@functools.cache
def get_depot_tools_path() -> pathlib.Path | None:
"""Finds the path to the depot_tools directory."""
gclient_path = shutil.which('gclient')
if not gclient_path:
return None
return pathlib.Path(gclient_path).resolve().parent
