Peter Waller 7c1bfa9093 Implement build cancellation ...

Add the capability to cancel the build by disconnecting the client.

This adds a `cancelled` channel which is used to signal that a build
should halt. The build is halted by sending a Kill signal and noticing
that the cancellation channel is closed.

This first pass implementation does not allow cancellation during a
pull, but that will come in a subsequent PR.

* Add documentation of cancellation to cli and API

* Protect job cancellation with sync.Once

* Add TestBuildCancelationKillsSleep

* Add test case for build cancellation of RUN statements.

Signed-off-by: Peter Waller <p@pwaller.net>
Upstream-commit: 671c12204cb469d868f646da1474d5bad6541770
Component: engine

2015-03-22 11:31:28 +00:00

components/engine

Implement build cancellation

2015-03-22 11:31:28 +00:00

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