27118289758

Committed 08 Jun 2026 05:40AM UTC coverage: 92.786% (-0.005%) from 92.791%

Build # 27118289758

Build Type

push

github

Committed by

web-flow

Commit Message

Fix uv support under remote caching/execution. (#23403)

As explained in #23344, a remote cache hit on the process that
creates the uv venv will cause venv creation to be skipped,
and pex will not find that venv locally.

With this change uv venv creation and the pex invocation that
uses it run under the same `Process`, ensuring that they are
always run together or cached together.

This fixes not only the remote caching issue but also a
similar issue with remote execution, when we aren't
guaranteed to run the two processes on the same machine.

Coverage Stats

13 of 13 new or added lines in 2 files covered. (100.0%)

8 existing lines in 4 files now uncovered.

93104 of 100343 relevant lines covered (92.79%)

3.69 hits per line

Source File
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96.15

/src/python/pants/backend/tools/preamble/subsystem.py

# Copyright 2022 Pants project contributors (see CONTRIBUTORS.md).
# Licensed under the Apache License, Version 2.0 (see LICENSE).
from __future__ import annotations

from collections.abc import Sequence

from pants.option.option_types import DictOption, SkipOption
from pants.option.subsystem import Subsystem
from pants.source.filespec import FilespecMatcher
from pants.util.strutil import help_text, softwrap


class PreambleSubsystem(Subsystem):
    options_scope = "preamble"
    name = "preamble"
    help = help_text(
        """
        Formats files with a preamble, with the preamble looked up based on path.

        This is useful for things such as copyright headers or shebang lines.

        Pants substitutes the following identifiers (following Python's `string.Template` substitutions):
        - $year: The current year (only used when actually writing the year to the file).
        """
    )

    skip = SkipOption("fmt")

    _template_by_globs = DictOption[str](
        help=softwrap(
            """
            Which preamble template to use based on the path globs (relative to the build root).

            Example:

                {
                    '*.rs': '// Copyright (c) $year\\n// Line 2\\n'
                    '*.py:!__init__.py': '# Copyright (c) $year\\n# Line 2\\n',
                }

            It might be helpful to load this config from a JSON or YAML file. To do that, set
            `[preamble].config = '@path/to/config.yaml'`, for example.
            """
        ),
        fromfile=True,
    )

    @property
    def template_by_globs(self) -> dict[tuple[str, ...], str]:
        return {tuple(key.split(":")): value for key, value in self._template_by_globs.items()}

    def get_template_by_path(self, filepaths: Sequence[str]) -> dict[str, str]:
        """Returns a mapping from path to (most-relevant) template."""
        filepaths_to_test = set(filepaths)
        template_by_path = {}
        for globs, template in self.template_by_globs.items():
            if not filepaths_to_test:
                break

            matched_filepaths = FilespecMatcher(
                includes=[
                    (glob[2:] if glob.startswith(r"\\!") else glob)
                    for glob in globs
                    if not glob.startswith("!")
                ],
                excludes=[glob[1:] for glob in globs if glob.startswith("!")],
            ).matches(tuple(filepaths_to_test))
            filepaths_to_test -= set(matched_filepaths)
            for filepath in matched_filepaths:
                template_by_path[filepath] = template

        return template_by_path

1	# Copyright 2022 Pants project contributors (see CONTRIBUTORS.md).
2	# Licensed under the Apache License, Version 2.0 (see LICENSE).
3	from __future__ import annotations	1✔
4
5	from collections.abc import Sequence	1✔
6
7	from pants.option.option_types import DictOption, SkipOption	1✔
8	from pants.option.subsystem import Subsystem	1✔
9	from pants.source.filespec import FilespecMatcher	1✔
10	from pants.util.strutil import help_text, softwrap	1✔
11
12
13	class PreambleSubsystem(Subsystem):	1✔
14	options_scope = "preamble"	1✔
15	name = "preamble"	1✔
16	help = help_text(	1✔
17	"""
18	Formats files with a preamble, with the preamble looked up based on path.
19
20	This is useful for things such as copyright headers or shebang lines.
21
22	Pants substitutes the following identifiers (following Python's `string.Template` substitutions):
23	- $year: The current year (only used when actually writing the year to the file).
24	"""
25	)
26
27	skip = SkipOption("fmt")	1✔
28
29	_template_by_globs = DictOption[str](	1✔
30	help=softwrap(
31	"""
32	Which preamble template to use based on the path globs (relative to the build root).
33
34	Example:
35
36	{
37	'*.rs': '// Copyright (c) $year\\n// Line 2\\n'
38	'*.py:!__init__.py': '# Copyright (c) $year\\n# Line 2\\n',
39	}
40
41	It might be helpful to load this config from a JSON or YAML file. To do that, set
42	`[preamble].config = '@path/to/config.yaml'`, for example.
43	"""
44	),
45	fromfile=True,
46	)
47
48	@property	1✔
49	def template_by_globs(self) -> dict[tuple[str, ...], str]:	1✔
50	return {tuple(key.split(":")): value for key, value in self._template_by_globs.items()}	1✔
51
52	def get_template_by_path(self, filepaths: Sequence[str]) -> dict[str, str]:	1✔
53	"""Returns a mapping from path to (most-relevant) template."""
54	filepaths_to_test = set(filepaths)	1✔
55	template_by_path = {}	1✔
56	for globs, template in self.template_by_globs.items():	1✔
57	if not filepaths_to_test:	1✔
UNCOV 58	break	×
59
60	matched_filepaths = FilespecMatcher(	1✔
61	includes=[
62	(glob[2:] if glob.startswith(r"\\!") else glob)
63	for glob in globs
64	if not glob.startswith("!")
65	],
66	excludes=[glob[1:] for glob in globs if glob.startswith("!")],
67	).matches(tuple(filepaths_to_test))
68	filepaths_to_test -= set(matched_filepaths)	1✔
69	for filepath in matched_filepaths:	1✔
70	template_by_path[filepath] = template	1✔
71
72	return template_by_path	1✔

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