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forbid chained onbuild, from & maintainer triggers

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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)
Upstream-commit: a79fae655d
Component: cli
This commit is contained in:
unclejack
2014-02-20 17:16:45 +02:00
committed by Tibor Vass
parent 0e1c391909
commit b3323cd058
1 changed files with 2 additions and 0 deletions
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2
components/cli/docs/sources/reference/builder.rst
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@@ -466,6 +466,8 @@ For example you might add something like this:
ONBUILD RUN /usr/local/bin/python-build --dir /app/src
[...]
.. warning:: Chaining ONBUILD instructions using `ONBUILD ONBUILD` isn't allowed.
.. warning:: ONBUILD may not trigger FROM or MAINTAINER instructions.
.. _dockerfile_examples: