tree 973906b8427d27e3b0064b72fb6b682b3218c8c7
parent d5767c8e7fe9ad6b6193a7746d7b9c67028dab54
author jmmv <jmmv@google.com> 1550751841 -0800
committer Copybara-Service <copybara-worker@google.com> 1550751911 -0800

Make PrepareEnvironmentForJvm() explicitly inherit environment variables.

The map returned by PrepareEnvironmentForJvm() previously represented a
"delta" to apply to the current environment.  This was used to modify the
environment surrounding fork/execv calls because we could not pass an envp
to execv.

However, when using the resulting map to create the envp value of a call
like posix_spawn, we must be exhaustive and list all variables we expect
the subprocess to have.  And as we are going to be using posix_spawn, we
need to make this happen, so change PrepareEnvironmentForJvm() to make
the returned map exhaustive.

Prerequisite change to address
https://github.com/bazelbuild/bazel/issues/7446 because of the need to
switch to posix_spawn.

RELNOTES: None.
PiperOrigin-RevId: 234971246