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]:7eab668982/cli/command/cli.go (L542-L551)Signed-off-by: Sebastiaan van Stijn <github@gone.nl> (cherry picked from commitf14eeeb361) Signed-off-by: Sebastiaan van Stijn <github@gone.nl>