bazelbuild/bazel

System-specific environment variables on Windows pollute remote cache

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#3,500 opened on Aug 3, 2017

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P4help wantedteam-Remote-Exectype: bug

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Description

Description of the problem / feature request / question:

When building C++ rules on Windows with MSVC, system-specific environment variables are part of the inputs, i.e.

SET TEMP=C:\Users\<my_user>\AppData\Local\Temp
SET TMP=C:\Users\<my_user>\AppData\Local\Temp
SET PATH="...;C:\Program Files (x86)\Skype\Phone\;C:\Program Files (x86)\Bitvise SSH Client;..."

For remote caching, this prevents sharing outputs between different systems.

Environment info

  • Operating System: Windows 10

  • Bazel version (output of bazel info release): release 0.5.4rc1

Have you found anything relevant by searching the web?

https://groups.google.com/forum/#!topic/bazel-discuss/4GV8lJzfeGQ

Contributor guide

Research direction
Investigate how Bazel captures environment variables for actions on Windows, specifically TEMP, TMP, and PATH, and identify where filtering or ignoring system specific variables should be added to allow cache sharing across different Windows systems.
Tech stack
java
Domain
build systemdeveloper experience
Issue type
Bug
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-2 days
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
Active
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Clear
Prerequisites
BazelWindows environmentC++ build
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
60