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86 lines
2.5 KiB
Python
86 lines
2.5 KiB
Python
#!/usr/bin/env vpython3
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# Copyright 2023 The ChromiumOS Authors
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# Use of this source code is governed by a BSD-style license that can be
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# found in the LICENSE file.
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# [VPYTHON:BEGIN]
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# python_version: "3.8"
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# [VPYTHON:END]
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"""Bazel launcher wrapper.
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This script starts Bazel appropriate for the project you're working in. It's
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currently used by ChromiumOS, but is intended for use and to be updated by any
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depot_tools users who are using Bazel.
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In the case this script is not able to detect which project you're working in,
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it will fall back to using the next "bazel" executable in your PATH.
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"""
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import itertools
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import os
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from pathlib import Path
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import shutil
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import sys
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from typing import List, Optional
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def _find_bazel_cros() -> Optional[Path]:
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"""Find the bazel launcher for ChromiumOS."""
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cwd = Path.cwd()
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for parent in itertools.chain([cwd], cwd.parents):
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bazel_launcher = parent / "chromite" / "bin" / "bazel"
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if bazel_launcher.exists():
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return bazel_launcher
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return None
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def _find_next_bazel_in_path() -> Optional[Path]:
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"""The fallback method: search the remainder of PATH for bazel."""
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# Remove depot_tools from PATH if present.
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depot_tools = Path(__file__).resolve().parent
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path_env = os.environ.get("PATH", os.defpath)
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search_paths = []
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for path in path_env.split(os.pathsep):
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if Path(path).resolve() != depot_tools:
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search_paths.append(path)
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new_path_env = os.pathsep.join(search_paths)
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bazel = shutil.which("bazel", path=new_path_env)
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if bazel:
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return Path(bazel)
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return None
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# All functions used to search for Bazel (in order of search).
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_SEARCH_FUNCTIONS = (
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_find_bazel_cros,
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_find_next_bazel_in_path,
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)
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_FIND_FAILURE_MSG = """\
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ERROR: The depot_tools bazel launcher was unable to find an appropriate bazel
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executable to use.
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For ChromiumOS developers:
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Make sure your current directory is inside a ChromiumOS checkout (e.g.,
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~/chromiumos). If you're already in a ChromiumOS checkout, it may be because
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you're working on a branch that's too old (i.e., prior to Bazel).
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If you're not working on any of the above listed projects, this launcher assumes
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that you have Bazel installed on your system somewhere else in PATH. Check that
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it's actually installed."""
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def main(argv: List[str]) -> int:
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"""Main."""
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for search_func in _SEARCH_FUNCTIONS:
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bazel = search_func()
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if bazel:
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os.execv(bazel, [str(bazel), *argv])
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print(_FIND_FAILURE_MSG, file=sys.stderr)
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return 1
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if __name__ == "__main__":
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sys.exit(main(sys.argv[1:]))
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