Aaron Lehmann c9bb330b71 Add a read-only mode as a configuration option
Add "readonly" under the storage/maintenance section. When this is set
to true, uploads and deletions will return 503 Service Unavailable
errors.

Document the parameter and add some unit testing.

Signed-off-by: Aaron Lehmann <aaron.lehmann@docker.com>
2015-09-22 15:47:48 -07:00
..
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