Fix some escaping around env var processing
Clarify in the docs that ENV is not recursive Closes #10391 Signed-off-by: Doug Davis <dug@us.ibm.com>master
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@ -146,6 +146,17 @@ The instructions that handle environment variables in the `Dockerfile` are:
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`ONBUILD` instructions are **NOT** supported for environment replacement, even
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the instructions above.
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Environment variable subtitution will use the same value for each variable
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throughout the entire command. In other words, in this example:
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ENV abc=hello
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ENV abc=bye def=$abc
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ENV ghi=$abc
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will result in `def` having a value of `hello`, not `bye`. However,
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`ghi` will have a value of `bye` because it is not part of the same command
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that set `abc` to `bye`.
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## The `.dockerignore` file
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If a file named `.dockerignore` exists in the source repository, then it
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