tree f5a35886134642eae7f620a1bb41040285184524
parent 40e13c041b07e1e1566c8de9b50cfcd6ab08649c
author Alex Deymo <deymo@google.com> 1464306193 -0700
committer Alex Deymo <deymo@google.com> 1466549042 -0700

Fetch local files asynchronously.

This patch implements a new fetcher that only handles local files.
While libcurl supports file:// urls, the stream can't be suspended when
accessing local files.

This new FileFetcher is based on the brillo::FileStream class which
properly handles the asynchronous reads from regular files.

Bug: 28866512
TEST=Added unittest. Deployed an update from a file:// URL.

(cherry picked from commit 2c131bbf81d8c02ade163b939c96e44aa93765e9)

Change-Id: I9949a0f214de992c2fd86c1d73aca1c1792f0de0