// initVersions collects state relevant to an upgrade decision. The returned
// agent and client versions, and the list of currently available tools, will
// always be accurate; the chosen version, and the flag indicating development
// mode, may remain blank until uploadTools or validate is called.
func (c *UpgradeJujuCommand) initVersions(cfg *config.Config, env environs.Environ) (*upgradeVersions, error) {
agent, ok := cfg.AgentVersion()
if !ok {
// Can't happen. In theory.
return nil, fmt.Errorf("incomplete environment configuration")
}
if c.Version == agent {
return nil, errUpToDate
}
client := version.Current.Number
available, err := environs.FindAvailableTools(env, client.Major)
if err != nil {
if !errors.IsNotFoundError(err) {
return nil, err
}
if !c.UploadTools {
if c.Version == version.Zero {
return nil, errUpToDate
}
return nil, err
}
}
dev := c.Development || cfg.Development() || agent.IsDev() || client.IsDev()
return &upgradeVersions{
dev: dev,
agent: agent,
client: client,
chosen: c.Version,
tools: available,
}, nil
}