tree c3f5a9f285cdf9f9730f4b5cb0ea048a8b40bcc9
parent c60675a9bbe6131b0207a63926987a794e6294e2
author Klaus Aehlig <aehlig@google.com> 1563209166 -0700
committer Copybara-Service <copybara-worker@google.com> 1563209224 -0700

repository_context.read: drop restriction to current repository

Currently, the read function of the repository context is restricted
to the external repository it is supposed to construct. However,
external repositories are routinely used for configure-like tasks
that inspect a lot of files all over the system and then write a
consolidated descripton of the system to the generated repository. In
fact, even for simple tasks like authentication for http_downloads,
we had to work around that restriction by symlinking the needed
file into the current repository before reading it (followed by
removing the symlink). So simply drop that restriction.

RELNOTES: repository_ctx.read is no longer restricted to files
    in the repository contructed.

Change-Id: I9d5003e00ae2acf9312b7fd65af7a40434933436
PiperOrigin-RevId: 258181706