guest: Wait for a file of gRPC port number getting ready

Some debian services, such as forwarder_guest_launcher and
shutdown_runner, read a gRPC number from a file provided
via virtiofs.
However, since virtiofs and the port number's setup takes some time,
the file soetimes is not ready when systemd tries to start these
daemons. As a result, these daemons could fail to be started
especially at the VM's first boot after installation.

This CL adds a logic to wait for the file getting ready.

Bug: none
Test: Start a VM and check journalctl to ensure the daemons didn't
fail to start.

Change-Id: If5df480815da3ad18f3e412dcabe06e4e7f804ea
4 files changed
tree: 71e70aa0845533d47fe764a195713bcf838aadf9
  1. android/
  2. build/
  3. docs/
  4. guest/
  5. libs/
  6. microfuchsia/
  7. tests/
  8. .clang-format
  9. .gitignore
  10. Android.bp
  11. dice_for_avf_guest.cddl
  12. OWNERS
  13. PREUPLOAD.cfg
  14. README.md
  15. rustfmt.toml
  16. TEST_MAPPING
README.md

Android Virtualization Framework (AVF)

Android Virtualization Framework (AVF) provides secure and private execution environments for executing code. AVF is ideal for security-oriented use cases that require stronger isolation assurances over those offered by Android’s app sandbox.

Visit our public doc site to learn more about what AVF is, what it is for, and how it is structured. This repository contains source code for userspace components of AVF.

If you want a quick start, see the getting started guideline and follow the steps there.

For in-depth explanations about individual topics and components, visit the following links.

AVF components:

AVF APIs:

How-Tos: