This carries a number of benefits:
- It allows the front end to trivially support schemes other than
"file:" (e.g. "http:") by allowing the client to supply a FileSystem
implementation that handles them.
- It is more consistent with the functionality of the ".packages" file
(which allows packages to map to any kind of URI).
- It allows the "bazel root" feature to be rewritten to use a magic
scheme rather than a magic path. (This eliminates concerns about
the magic path overlapping with a user's use case). Note that this
feature has been renamed to "multi root" since it is sufficiently
generic to be applicable to build systems other than Bazel.
- It reduces the risk of forgetting to use the front end's FileSystem
abstraction to access the file system, since the native file system
interfaces do not accept URIs.
R=danrubel@google.com
Review-Url: https://codereview.chromium.org/2614063007 .
Paul Berry