invalid escape sequence on windows

[honglooker]

🐞 bug report

Affected Rule

local python toolchain: +_repo_rules+local_python3

Is this a regression?

We did not hit this in 1.4.2.

Description

I cannot upgrade Protobuf to 1.5.4 due to this issue. Looks like Windows CI is failing when I try to upgrade.

🔬 Minimal Reproduction

@rickeylev please see https://github.com/protocolbuffers/protobuf/actions/runs/17304047679/job/49122338767

🔥 Exception or Error

ERROR: C:/tmp/3hjz7nbt/external/+_repo_rules+local_python3/BUILD.bazel:11:28: invalid escape sequence: \h. Use '\\' to insert '\'.
ERROR: C:/tmp/3hjz7nbt/external/+_repo_rules+local_python3/BUILD.bazel:11:44: invalid escape sequence: \w. Use '\\' to insert '\'.
ERROR: C:/tmp/3hjz7nbt/external/+_repo_rules+local_python3/BUILD.bazel:11:52: invalid escape sequence: \P. Use '\\' to insert '\'.
ERROR: C:/tmp/3hjz7nbt/external/+_repo_rules+local_python3/BUILD.bazel:11:66: invalid escape sequence: \x. Use '\\' to insert '\'.
ERROR: C:/tmp/3hjz7nbt/external/+_repo_rules+local_python3/BUILD.bazel:11:70: invalid escape sequence: \p. Use '\\' to insert '\'.
ERROR: C:/tmp/3hjz7nbt/external/+_repo_rules+local_python3/BUILD.bazel: no such target '@@+_repo_rules+local_python3//:os': target 'os' not declared in package '' defined by C:/tmp/3hjz7nbt/external/+_repo_rules+local_python3/BUILD.bazel

🌍 Your Environment

Windows CI

Output of bazel version:

7.x, 8.x

Rules_python version:

1.5.4

[aignas]

@honglooker, @rickeylev, I suspect this may have been fixed in #3148. Is there any chance you could try the 1.6.0-rc0 release or cherry-pick the patch to see if it works?

[aignas]

If it is not fixed by above, let me know, I'll re-open this ticket.

[honglooker]

Hey @aignas, I just tried rc0 and we're all green. Thanks!