Stephen J Day bff0a1048f container/controller: avoid cancellation with forked pull context ...

Context cancellations were previously causing `Prepare` to fail
completely on re-entrant calls. To prevent this, we filtered out cancels
and deadline errors. While this allowed the service to proceed without
errors, it had the possibility of interrupting long pulls, causing the
pull to happen twice.

This PR forks the context of the pull to match the lifetime of
`Controller`, ensuring that for each task, the pull is only performed
once. It also ensures that multiple calls to `Prepare` are re-entrant,
ensuring that the pull resumes from its original position.

Signed-off-by: Stephen J Day <stephen.day@docker.com>
Upstream-commit: d8d71ad5b94d44a2778f2d8989424259cac94e9b
Component: engine

2016-07-25 21:52:10 -07:00

components/engine

container/controller: avoid cancellation with forked pull context

2016-07-25 21:52:10 -07:00

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