unclejack a79fae655d forbid chained onbuild, from & maintainer triggers ... This changes the way onbuild works: - forbids the chaining of onbuild instructions - forbids the use of `onbuild from` - forbids the use of `onbuild maintainer` It also makes docker throw errors when encountering such triggers when executing the triggers during `FROM`. Three tests have been added: - ensure that chained onbuild (`onbuild onbuild`) is forbidden - ensure that `onbuild from` is forbidden - ensure that `onbuild maintainer` is forbidden Docker-DCO-1.1-Signed-off-by: Cristian Staretu <cristian.staretu@gmail.com> (github: unclejack)		2017-06-02 00:06:21 +00:00
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reference	forbid chained onbuild, from & maintainer triggers	2017-06-02 00:06:21 +00:00