unclejack e59443d033 add ValidateContextDirectory to utils/utils.go
This commit adds a function which can be used to ensure all contents of
a directory can be accessed.

This function doesn't follow symlinks to check if they're pointing to
files which exist. Such symlinks can be useful later.

Docker-DCO-1.1-Signed-off-by: Cristian Staretu <cristian.staretu@gmail.com> (github: unclejack)
Upstream-commit: 1dedcd0d376f57abae5cadd38116c1aca2821330
Component: engine
2014-05-17 02:38:28 +03:00
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