DockerCLI/vendor/github.com/docker/notary/notary.go

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package notary
// PassRetriever is a callback function that should retrieve a passphrase
// for a given named key. If it should be treated as new passphrase (e.g. with
// confirmation), createNew will be true. Attempts is passed in so that implementers
// decide how many chances to give to a human, for example.
type PassRetriever func(keyName, alias string, createNew bool, attempts int) (passphrase string, giveup bool, err error)