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Fix some escaping around env var processing

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Clarify in the docs that ENV is not recursive

Closes #10391

Signed-off-by: Doug Davis <dug@us.ibm.com>
Upstream-commit: f32b6eb23c
Component: cli
This commit is contained in:
Doug Davis
2015-01-28 18:28:48 -08:00
committed by Tibor Vass
parent 1e74a9742a
commit 39d8bc547c
1 changed files with 11 additions and 0 deletions
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components/cli/docs/sources/reference/builder.md
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@@ -146,6 +146,17 @@ The instructions that handle environment variables in the `Dockerfile` are:
`ONBUILD` instructions are **NOT** supported for environment replacement, even
the instructions above.
Environment variable subtitution will use the same value for each variable
throughout the entire command. In other words, in this example:
ENV abc=hello
ENV abc=bye def=$abc
ENV ghi=$abc
will result in `def` having a value of `hello`, not `bye`. However,
`ghi` will have a value of `bye` because it is not part of the same command
that set `abc` to `bye`.
## The `.dockerignore` file
If a file named `.dockerignore` exists in the source repository, then it