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Minor edits to Environment variables section

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* Clarify the list of supported instructions.
* Clarify behavior of ONBUILD, based on comments by @SvenDowideit, @theJeztah in PR #14735.
* Reorder list of instructions in alphabetical order.

Signed-off-by: Charles Chan <charleswhchan@users.noreply.github.com>
Upstream-commit: 8a1164778d
Component: cli
This commit is contained in:
Charles Chan
2015-07-18 21:09:48 -07:00
committed by Tibor Vass
parent 0df373b9b1
commit 0cf3c17dc2
1 changed files with 12 additions and 6 deletions
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18
components/cli/docs/reference/builder.md
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@@ -152,18 +152,24 @@ Example (parsed representation is displayed after the `#`):
ADD . $foo # ADD . /bar
COPY \$foo /quux # COPY $foo /quux
The instructions that handle environment variables in the `Dockerfile` are:
Environment variables are supported by the following list of instructions in
the `Dockerfile`:
* `ENV`
* `ADD`
* `COPY`
* `WORKDIR`
* `ENV`
* `EXPOSE`
* `VOLUME`
* `USER`
* `WORKDIR`
* `VOLUME`
`ONBUILD` instructions are **NOT** supported for environment replacement, even
the instructions above.
as well as:
* `ONBUILD` (when combined with one of the supported instructions above)
> **Note**:
> prior to 1.4, `ONBUILD` instructions did **NOT** support environment
> variable, even when combined with any of the instructions listed above.
Environment variable substitution will use the same value for each variable
throughout the entire command. In other words, in this example: