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Filter `hg` subprocess environment to the minimum

Description

Filter hg subprocess environment to the minimum

We don't want the user's environment to affect hg's behavior. The bare
minimum is the PATH. In the next patch, we add the Mercurial-specific
variables to ensure a "vanilla" behavior.

Details

Provenance
AlphareAuthored on Feb 23 2021, 3:50 PM
AlpharePushed on Feb 23 2021, 4:47 PM
Differential Revision
D5124: Disable user customization in Mercurial tests
Parents
rDLDHG70dcbb67e6f5: Sort imports according to `isort` rules
Branches
Unknown
Tags
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Build Status
Buildable 19433
Build 30144: test-and-buildJenkins console · Jenkins