// findCompatibleTools finds tools in the list that have the same major, minor // and patch level as version.Current. // // Build number is not important to match; uploaded tools will have // incremented build number, and we want to match them. func findCompatibleTools(possibleTools coretools.List, version version.Number) (version.Number, coretools.List) { var compatibleTools coretools.List for _, tools := range possibleTools { if isCompatibleVersion(tools.Version.Number, version) { compatibleTools = append(compatibleTools, tools) } } return compatibleTools.Newest() }
// SetBootstrapTools returns the newest tools from the given tools list, // and updates the agent-version configuration attribute. func SetBootstrapTools(environ environs.Environ, possibleTools coretools.List) (coretools.List, error) { if len(possibleTools) == 0 { return nil, fmt.Errorf("no bootstrap tools available") } var newVersion version.Number newVersion, toolsList := possibleTools.Newest() logger.Infof("newest version: %s", newVersion) cfg := environ.Config() if agentVersion, _ := cfg.AgentVersion(); agentVersion != newVersion { cfg, err := cfg.Apply(map[string]interface{}{ "agent-version": newVersion.String(), }) if err == nil { err = environ.SetConfig(cfg) } if err != nil { return nil, fmt.Errorf("failed to update environment configuration: %v", err) } } bootstrapVersion := newVersion // We should only ever bootstrap the exact same version as the client, // or we risk bootstrap incompatibility. We still set agent-version to // the newest version, so the agent will immediately upgrade itself. if !isCompatibleVersion(newVersion, version.Current.Number) { compatibleVersion, compatibleTools := findCompatibleTools(possibleTools, version.Current.Number) if len(compatibleTools) == 0 { logger.Warningf( "failed to find %s tools, will attempt to use %s", version.Current.Number, newVersion, ) } else { bootstrapVersion, toolsList = compatibleVersion, compatibleTools } } logger.Infof("picked bootstrap tools version: %s", bootstrapVersion) return toolsList, nil }