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Docs: JSON vs Shell clarification

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Signed-off-by: John Howard <jhoward@microsoft.com>
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John Howard 2016-05-20 20:56:08 -07:00
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docs/reference/builder.md
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@ -362,6 +362,15 @@ RUN /bin/bash -c 'source $HOME/.bashrc ; echo $HOME'
> `RUN [ "echo", "$HOME" ]` will not do variable substitution on `$HOME`.
> If you want shell processing then either use the *shell* form or execute
> a shell directly, for example: `RUN [ "sh", "-c", "echo $HOME" ]`.
>
> **Note**:
> In the *JSON* form, it is necessary to escape backslashes. This is
> particularly relevant on Windows where the backslash is the path seperator.
> The following line would otherwise be treated as *shell* form due to not
> being valid JSON, and fail in an unexpected way:
> `RUN ["c:\windows\system32\tasklist.exe"]`
> The correct syntax for this example is:
> `RUN ["c:\\windows\\system32\\tasklist.exe"]`
The cache for `RUN` instructions isn't invalidated automatically during
the next build. The cache for an instruction like