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Settings.js: support syntax for default values
+---------------------------+---------------+------------------+ | 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" | | "${ENV_VAR:some_default}" | undefined | "some_default" | +---------------------------+---------------+------------------+ Mention this briefly in the main README.md, also. Closes #3578.
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4 changed files with 41 additions and 22 deletions
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@ -11,33 +11,38 @@
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* =================================
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*
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* All the configuration values can be read from environment variables using the
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* syntax "${ENV_VAR}".
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* syntax "${ENV_VAR}" or "${ENV_VAR:default_value}".
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*
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* This is useful, for example, when running in a Docker container.
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*
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* EXAMPLE:
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* "port": "${PORT}"
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* "port": "${PORT:9001}"
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* "minify": "${MINIFY}"
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* "skinName": "${SKIN_NAME}"
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* "skinName": "${SKIN_NAME:colibris}"
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*
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* Would read the configuration values for those items from the environment
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* variables PORT, MINIFY and SKIN_NAME.
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* If PORT and SKIN_NAME variables were not defined, the default values 9001 and
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* "colibris" would be used. The configuration value "minify", on the other
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* hand, does not have a default indicated. Thus, if the environment variable
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* MINIFY were undefined, "minify" would be null (do not do this).
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*
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* REMARKS:
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* Please note that variable substitution always needs to be quoted.
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*
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* "port": 9001, <-- Literal values. When not using
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* "minify": false substitution, only strings must be quoted.
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* "skinName": "colibris" Booleans and numbers must not.
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* "port": 9001, <-- Literal values. When not using
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* "minify": false substitution, only strings must be
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* "skinName": "colibris" quoted. Booleans and numbers must not.
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*
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* "port": "${PORT}" <-- CORRECT: if you want to use a variable
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* "minify": "${MINIFY}" substitution, put quotes around its name,
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* "skinName": "${SKIN_NAME}" even if the required value is a number or a
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* boolean.
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* Etherpad will take care of rewriting it to
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* the proper type if necessary.
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* "port": "${PORT:9001}" <-- CORRECT: if you want to use a variable
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* "minify": "${MINIFY:true}" substitution, put quotes around its name,
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* "skinName": "${SKIN_NAME}" even if the required value is a number or
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* a boolean.
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* Etherpad will take care of rewriting it
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* to the proper type if necessary.
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*
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* "port": ${PORT} <-- ERROR: this is not valid json. Quotes
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* "minify": ${MINIFY} around variable names are missing.
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* "port": ${PORT:9001} <-- ERROR: this is not valid json. Quotes
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* "minify": ${MINIFY} around variable names are missing.
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* "skinName": ${SKIN_NAME}
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*
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*/
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