tree 67b4ae9a560c454a9da82d3e1153710f4a10a542
parent c1dacd3683fe9184d299cbbe0bd9231ad6feb224
author jmmv <jmmv@google.com> 1521511460 -0700
committer Copybara-Service <copybara-piper@google.com> 1521511591 -0700

Plumb support for mounting a sandboxfs instance during a build.

This introduces user-facing options to enable the experimental sandboxfs
support and, when enabled, mounts a sandboxfs instance throughout the
build.  The sandboxfs' process handle is passed to the
SandboxActionContextProvider so that the SpawnRunners can later consume it.

Note that this does NOT yet provide sandboxfs support for the builds as the
SpawnRunners are untouched.

RELNOTES: None.
PiperOrigin-RevId: 189678732