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hostVar is used for the '--host' / '-H' flag to set [ClientOptions.Hosts]. The [ClientOptions.Hosts] field is a slice because it was originally shared with the daemon config. However, the CLI only allows for a single host to be specified. hostVar presents itself as a "string", but stores the value in a string slice. It produces an error when trying to set multiple values, matching the check in [getServerHost]. [getServerHost]: https://github.com/docker/cli/blob/7eab668982645def1cd46fe1b60894cba6fd17a4/cli/command/cli.go#L542-L551 Signed-off-by: Sebastiaan van Stijn <github@gone.nl>