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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 12:42:17 +02:00
parent e4b7edde09
commit 0a0037c6fd
8 changed files with 47 additions and 44 deletions
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docs/reference/commandline/import.md
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@ -72,7 +72,7 @@ $ sudo tar -c . | docker import - exampleimagedir
### Import from a local directory with new configurations
```bash
$ sudo tar -c . | docker import --change "ENV DEBUG true" - exampleimagedir
$ sudo tar -c . | docker import --change "ENV DEBUG=true" - exampleimagedir
```
Note the `sudo` in this example – you must preserve