Rule engine

MSR uses a rule engine to evaluate policies, such as tag pruning and image enforcement. The rule engine supports the following operators:

• greater than or equals
• greater than
• equals
• not equals
• less than or equals
• less than
• starts with
• ends with
• contains
• one of
• not one of
• matches
• before
• after

Note

The matches operator conforms subject fields to a user-provided regular expression (regex). The regex for matches must follow the specification in the official Go documentation: Package syntax.

Each of the following policies uses the rule engine:

• Promotion policies
• Push mirroring policies
• Image enforcement policies
• Tag pruning policies