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builder: rephrase ENV section, remove examples for ENV key value without '='

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The `ENV key value` form can be ambiguous, for example, the following defines
a single env-variable (`ONE`) with value `"TWO= THREE=world"`:

    ENV ONE TWO= THREE=world

While we cannot deprecate/remove that syntax (as it would break existing
Dockerfiles), we should reduce exposure of the format in our examples.

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
This commit is contained in:
Sebastiaan van Stijn
2020-09-23 13:21:20 +02:00
parent e4b7edde09
commit 0a0037c6fd
8 changed files with 47 additions and 44 deletions
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man/src/container/commit.md
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@@ -27,4 +27,4 @@ variable set to "true", you can create a new image based on that
container by first getting the container's ID with `docker ps` and
then running:
$ docker container commit -c="ENV DEBUG true" 98bd7fc99854 debug-image
$ docker container commit -c="ENV DEBUG=true" 98bd7fc99854 debug-image