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add a documentation note on backslash usage in shell form of RUN

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Signed-off-by: Amen Belayneh <amenbelayneh@gmail.com>
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Amen Belayneh 2015-09-12 15:26:14 +08:00
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commit 6a55d95334
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6
docs/reference/builder.md
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@ -311,6 +311,12 @@ commands using a base image that does not contain `/bin/sh`.
> If you want shell processing then either use the *shell* form or execute
> a shell directly, for example: `RUN [ "sh", "-c", "echo", "$HOME" ]`.
> **Note**:
> If you choose to use the *shell* form, any time you want to continue a single
> `RUN` instruction onto the next line, it has to be ended with a backslash `\`.
> For example, `RUN /bin/bash -c 'source $HOME/.bashrc ;\` then on the next
> line ` echo $HOME '`.
The cache for `RUN` instructions isn't invalidated automatically during
the next build. The cache for an instruction like
`RUN apt-get dist-upgrade -y` will be reused during the next build. The