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Document arg before from

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Signed-off-by: Daniel Nephin <dnephin@docker.com>
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Daniel Nephin 2017-05-12 18:45:08 -04:00 committed by Tibor Vass
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docs/reference/builder.md
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@ -530,6 +530,17 @@ FROM extras:${CODE_VERSION}
CMD /code/run-extras
```
To use the default value of an `ARG` declared before the first `FROM` use an
`ARG` instruction without a value:
```Dockerfile
ARG SETTINGS=default
FROM busybox
ARG SETTINGS
```
## RUN
RUN has 2 forms: