// 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(client *api.Client, cfg *config.Config) (*upgradeContext, 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
}
clientVersion := version.Current.Number
findResult, err := client.FindTools(clientVersion.Major, -1, "", "")
if err != nil {
return nil, err
}
err = findResult.Error
if findResult.Error != nil {
if !params.IsCodeNotFound(err) {
return nil, err
}
if !c.UploadTools {
// No tools found and we shouldn't upload any, so if we are not asking for a
// major upgrade, pretend there is no more recent version available.
if c.Version == version.Zero && agent.Major == clientVersion.Major {
return nil, errUpToDate
}
return nil, err
}
}
return &upgradeContext{
agent: agent,
client: clientVersion,
chosen: c.Version,
tools: findResult.List,
apiClient: client,
config: cfg,
}, nil
}