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Merge pull request #14735 from charleswhchan/patch-1

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Minor edits to Environment variables section
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Jessie Frazelle 2015-07-27 10:37:39 -07:00
commit f3af9c8bdb
1 changed files with 12 additions and 6 deletions
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18
docs/reference/builder.md
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@ -152,18 +152,24 @@ Example (parsed representation is displayed after the `#`):
ADD . $foo # ADD . /bar ADD . $foo # ADD . /bar
COPY \$foo /quux # COPY $foo /quux 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` * `ADD`
* `COPY` * `COPY`
* `WORKDIR` * `ENV`
* `EXPOSE` * `EXPOSE`
* `VOLUME`
* `USER` * `USER`
* `WORKDIR`
* `VOLUME`
`ONBUILD` instructions are **NOT** supported for environment replacement, even as well as:
the instructions above.
* `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 Environment variable substitution will use the same value for each variable
throughout the entire command. In other words, in this example: throughout the entire command. In other words, in this example: