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fix(pypi): allow pip_compile to work with read-only sources #2712

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fix(pypi): allow pip_compile to work with read-only sources #2712

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5290d62
fix: allow pip_compile to work with read-only sources
rbeasley-avgo Feb 12, 2025
3641605
fixup! fix: allow pip_compile to work with read-only sources
rbeasley-avgo Mar 31, 2025
c4f5fb7
fixup! fix: allow pip_compile to work with read-only sources
rbeasley-avgo Mar 31, 2025
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2 changes: 2 additions & 0 deletions CHANGELOG.md
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Original file line number Diff line number Diff line change
Expand Up @@ -69,6 +69,8 @@ Unreleased changes template.
* (toolchains) Remove all but `3.8.20` versions of the Python `3.8` interpreter who has
reached EOL. If users still need other versions of the `3.8` interpreter, please supply
the URLs manually {bzl:ob}`python.toolchain` or {bzl:obj}`python_register_toolchains` calls.
* (pypi) When running under `bazel test`, be sure that temporary `requirements` file
remains writable.

[20250317]: https://github.com/astral-sh/python-build-standalone/releases/tag/20250317

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9 changes: 8 additions & 1 deletion python/private/pypi/dependency_resolver/dependency_resolver.py
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Expand Up @@ -148,9 +148,16 @@ def main(
requirements_out = os.path.join(
os.environ["TEST_TMPDIR"], os.path.basename(requirements_file) + ".out"
)
# Why this uses shutil.copyfileobj:
#
# Those two files won't necessarily be on the same filesystem, so we can't use os.replace
# or shutil.copyfile, as they will fail with OSError: [Errno 18] Invalid cross-device link.
shutil.copy(resolved_requirements_file, requirements_out)
#
# Further, shutil.copy preserves the source file's mode, and so if
# our source file is read-only (the default under Perforce Helix),
# this scratch file will also be read-only, defeating its purpose.
with open(resolved_requirements_file, "rb") as fsrc, open(requirements_out, "wb") as fdst:
shutil.copyfileobj(fsrc, fdst)

update_command = os.getenv("CUSTOM_COMPILE_COMMAND") or "bazel run %s" % (
update_target_label,
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