[dash-launcher] Implement `chns`, `chexp` and `chout`

These helper binaries allow launching a tool using the
component namespace/exposed/out directory as the root.

To launch the tool `iquery` rooted at the exposed
dir of `/bootstrap/archivist`:

```
> ffx component explore /bootstrap/archivist
$ chexp iquery list
```

This will help tools that have trouble with
compatibility with the dash namespace.

Test: fx test chroot
Change-Id: Ie4fac40799ad6bf07512b8d3831235f3106b48dd
Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/687730
Commit-Queue: Xyan Bhatnagar <xbhatnag@google.com>
Reviewed-by: Shai Barack <shayba@google.com>
Reviewed-by: Adam Perry <adamperry@google.com>
9 files changed
tree: 7da844548d7fc6cb339059d1d6fcfc9fd6e82bea
  1. boards/
  2. build/
  3. bundles/
  4. docs/
  5. examples/
  6. products/
  7. scripts/
  8. sdk/
  9. src/
  10. third_party/
  11. tools/
  12. zircon/
  13. .clang-format
  14. .clang-tidy
  15. .editorconfig
  16. .git-blame-ignore-revs
  17. .gitattributes
  18. .gitignore
  19. .gn
  20. .style.yapf
  21. analysis_options.yaml
  22. AUTHORS
  23. BUILD.gn
  24. CODE_OF_CONDUCT.md
  25. CONTRIBUTING.md
  26. LICENSE
  27. OWNERS
  28. PATENTS
  29. pyrightconfig.json
  30. README.md
  31. rustfmt.toml
README.md

Fuchsia

What is Fuchsia?

Fuchsia is an open source, general purpose operating system supporting modern 64-bit Intel and ARM processors.

We expect everyone interacting with our project to respect our code of conduct.

Read more about Fuchsia's principles.

How can I build and run Fuchsia?

See Getting Started.

Where can I learn more about Fuchsia?

See fuchsia.dev.