Guest24897
/
DockerCLI
mirror of https://github.com/docker/cli.git
1
0
Fork 0
Code Issues Packages Projects Releases Wiki Activity

Minor edits to Environment variables section 

* 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>
This commit is contained in:
Charles Chan 2015-07-18 21:09:48 -07:00 committed by Tibor Vass
parent 1eea853f2d
commit 8a1164778d
1 changed files with 12 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

18
docs/reference/builder.md
View File

@ -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: