Brian Goff 978d8e86f8 Return better errors from exec
Also cleans up some of the API side of exec.
Was writing the header twice (two different headers).

Signed-off-by: Brian Goff <cpuguy83@gmail.com>
Upstream-commit: f078f75bf25353720f28f9f1ea180374fe205302
Component: engine
2015-08-10 09:53:19 -04:00
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