(⬑JSON API Index)

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• Fetch Settings
• Set Settings

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Fetch Settings

Status: Implemented 20230120

Required permissions: "o"

Request: /json/settings/get[?version=X]

Response payload example:

{
 "access-log":{
 "versionable":false,
 "sensitive":false,
 "defaultValue":"off",
 "valueSource":null,
 "value":null
 },
...
 "binary-glob":{
 "versionable":true,
 "sensitive":false,
 "defaultValue":null,
 "valueSource":"versioned",
 "value":"*.gif\n*.ico\n*.jpg\n*.odp\n*.dia\n*.pdf\n*.png\n*.wav..."
 },
...
 "web-browser":{
 "versionable":false,
 "sensitive":true,
 "defaultValue":null,
 "valueSource":"repo",
 "value":"firefox"
 }
}

Each key in the payload is the name of a fossil-recognized setting, modeled as an object. The keys of that are:

• defaultValue: the setting's default value, or null if no default is defined.
• value: The current value of that setting.
• valueSource: one of ("repo", "checkout", "versioned", or null), specifying the data source where the setting was found. The settings sources are checked in this order and the first one found is the result:
  • If version=X is provided, check-in X is searched for a versionable-settings file. If found, its value is used and valueSource will be "versioned". If X is not a checkin, an error response is produced with code FOSSIL-3006.
  • If a versionable setting is found in the current checkout, its value is used and valueSource will be "versioned"
  • If the setting is found in checkout database's vvar table, its value is used and valueSource will be "checkout".
  • If the setting is found in repository's config table, its value is used and valueSource will be "repo".
  • If no value is found, null is used for both the value and valueSource results. Note that global settings are never checked because they can leak information which have nothing specifically to do with the given repository.
• sensitive: a value which fossil has flagged as sensitive can only be fetched by a Setup user. For other users, they will always have a value and valueSource of null.
• versionable: true if the setting is tagged as versionable, else false.

Note that settings are internally stored as strings, even if they're semantically treated as numbers. The way settings are stored and handled does not give us enough information to recognize their exact data type here so they are passed on as-is.

Set Settings

Status: Implemented 20230120

Required permissions: "s"

Request: /json/settings/set

This call requires that the input payload be an object containing a mapping of fossil-known configuration keys (case-sensitive) to values. For example:

{
 "editor": "emacs",
 "admin-log": true,
 "auto-captcha": false
}

It iterates through each property, which must have a data type of null, boolean, number, or string. A value of null unsets (deletes) the setting. Boolean values are stored as integer 0 or 1. All other types are stored as-is. It only updates the repository.config database and never updates a checkout or global config database, nor is it capable of updating versioned settings¹ .

It has no result payload but this may be changed in the future it practice shows that it should return something specific.

Error responses include:

• FOSSIL-2002: called without "setup" permissions.
• FOSSIL-3002: called without a payload object.
• FOSSIL-3001: passed an unknown config option.
• FOSSIL-3000: a value has an unsupported data type.

If an error is triggered, any settings made by this call up until that point are discarded.

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1. ^{^} Updating versioned settings requires creating a full check-in.