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Settings.js: support syntax for default values

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+---------------------------+---------------+------------------+
| Configuration string in   | Value of      | Resulting confi- |
| settings.json             | ENV_VAR       | guration value   |
|---------------------------|---------------|------------------|
| "${ENV_VAR}"              | "some_string" | "some_string"    |
| "${ENV_VAR}"              | "9001"        | 9001             |
| "${ENV_VAR}"              | undefined     | null             |
| "${ENV_VAR:some_default}" | "some_string" | "some_string"    |
| "${ENV_VAR:some_default}" | undefined     | "some_default"   |
+---------------------------+---------------+------------------+

Mention this briefly in the main README.md, also.

Closes #3578.
This commit is contained in:
muxator 2019-03-21 01:37:19 +01:00 • committed by muxator
parent c3bca6506e
commit 2955740a6e
4 changed files with 41 additions and 22 deletions
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2
docker/README.md
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@ -14,7 +14,7 @@ cp ../settings.json.template settings.json
[ further edit your settings.json as needed]
```
**Each configuration parameter can also be set via an environment variable**, using the syntax `"${ENV_VAR_NAME}"`. For details, refer to `settings.json.template`.
**Each configuration parameter can also be set via an environment variable**, using the syntax `"${ENV_VAR}"` or `"${ENV_VAR:default_value}"`. For details, refer to `settings.json.template`.
Build the version you prefer:
```bash