package chef import ( "bytes" "encoding/json" "errors" "fmt" "io" "log" "os" "path" "regexp" "strings" "text/template" "time" "github.com/hashicorp/terraform/communicator" "github.com/hashicorp/terraform/communicator/remote" "github.com/hashicorp/terraform/terraform" "github.com/mitchellh/go-homedir" "github.com/mitchellh/go-linereader" "github.com/mitchellh/mapstructure" ) const ( clienrb = "client.rb" defaultEnv = "_default" firstBoot = "first-boot.json" logfileDir = "logfiles" linuxChefCmd = "chef-client" linuxConfDir = "/etc/chef" secretKey = "encrypted_data_bag_secret" validationKey = "validation.pem" windowsChefCmd = "cmd /c chef-client" windowsConfDir = "C:/chef" ) const clientConf = ` log_location STDOUT chef_server_url "{{ .ServerURL }}" validation_client_name "{{ .ValidationClientName }}" node_name "{{ .NodeName }}" {{ if .UsePolicyfile }} use_policyfile true policy_group "{{ .PolicyGroup }}" policy_name "{{ .PolicyName }}" {{ end }} {{ if .HTTPProxy }} http_proxy "{{ .HTTPProxy }}" ENV['http_proxy'] = "{{ .HTTPProxy }}" ENV['HTTP_PROXY'] = "{{ .HTTPProxy }}" {{ end }} {{ if .HTTPSProxy }} https_proxy "{{ .HTTPSProxy }}" ENV['https_proxy'] = "{{ .HTTPSProxy }}" ENV['HTTPS_PROXY'] = "{{ .HTTPSProxy }}" {{ end }} {{ if .NOProxy }}no_proxy "{{ join .NOProxy "," }}"{{ end }} {{ if .SSLVerifyMode }}ssl_verify_mode {{ .SSLVerifyMode }}{{ end }} ` // Provisioner represents a specificly configured chef provisioner type Provisioner struct { Attributes interface{} `mapstructure:"attributes"` Environment string `mapstructure:"environment"` LogToFile bool `mapstructure:"log_to_file"` UsePolicyfile bool `mapstructure:"use_policyfile"` PolicyGroup string `mapstructure:"policy_group"` PolicyName string `mapstructure:"policy_name"` HTTPProxy string `mapstructure:"http_proxy"` HTTPSProxy string `mapstructure:"https_proxy"` NOProxy []string `mapstructure:"no_proxy"` NodeName string `mapstructure:"node_name"` OhaiHints []string `mapstructure:"ohai_hints"` OSType string `mapstructure:"os_type"` PreventSudo bool `mapstructure:"prevent_sudo"` RunList []string `mapstructure:"run_list"` SecretKeyPath string `mapstructure:"secret_key_path"` ServerURL string `mapstructure:"server_url"` SkipInstall bool `mapstructure:"skip_install"` SSLVerifyMode string `mapstructure:"ssl_verify_mode"` ValidationClientName string `mapstructure:"validation_client_name"` ValidationKeyPath string `mapstructure:"validation_key_path"` Version string `mapstructure:"version"` installChefClient func(terraform.UIOutput, communicator.Communicator) error createConfigFiles func(terraform.UIOutput, communicator.Communicator) error runChefClient func(terraform.UIOutput, communicator.Communicator) error useSudo bool } // ResourceProvisioner represents a generic chef provisioner type ResourceProvisioner struct{} // Apply executes the file provisioner func (r *ResourceProvisioner) Apply( o terraform.UIOutput, s *terraform.InstanceState, c *terraform.ResourceConfig) error { // Decode the raw config for this provisioner p, err := r.decodeConfig(c) if err != nil { return err } if p.OSType == "" { switch s.Ephemeral.ConnInfo["type"] { case "ssh", "": // The default connection type is ssh, so if the type is empty assume ssh p.OSType = "linux" case "winrm": p.OSType = "windows" default: return fmt.Errorf("Unsupported connection type: %s", s.Ephemeral.ConnInfo["type"]) } } // Set some values based on the targeted OS switch p.OSType { case "linux": p.installChefClient = p.linuxInstallChefClient p.createConfigFiles = p.linuxCreateConfigFiles p.runChefClient = p.runChefClientFunc(linuxChefCmd, linuxConfDir) p.useSudo = !p.PreventSudo && s.Ephemeral.ConnInfo["user"] != "root" case "windows": p.installChefClient = p.windowsInstallChefClient p.createConfigFiles = p.windowsCreateConfigFiles p.runChefClient = p.runChefClientFunc(windowsChefCmd, windowsConfDir) p.useSudo = false default: return fmt.Errorf("Unsupported os type: %s", p.OSType) } // Get a new communicator comm, err := communicator.New(s) if err != nil { return err } // Wait and retry until we establish the connection err = retryFunc(comm.Timeout(), func() error { err := comm.Connect(o) return err }) if err != nil { return err } defer comm.Disconnect() if !p.SkipInstall { if err := p.installChefClient(o, comm); err != nil { return err } } o.Output("Creating configuration files...") if err := p.createConfigFiles(o, comm); err != nil { return err } o.Output("Starting initial Chef-Client run...") if err := p.runChefClient(o, comm); err != nil { return err } return nil } // Validate checks if the required arguments are configured func (r *ResourceProvisioner) Validate(c *terraform.ResourceConfig) (ws []string, es []error) { p, err := r.decodeConfig(c) if err != nil { es = append(es, err) return ws, es } if p.NodeName == "" { es = append(es, fmt.Errorf("Key not found: node_name")) } if p.RunList == nil { es = append(es, fmt.Errorf("Key not found: run_list")) } if p.ServerURL == "" { es = append(es, fmt.Errorf("Key not found: server_url")) } if p.ValidationClientName == "" { es = append(es, fmt.Errorf("Key not found: validation_client_name")) } if p.ValidationKeyPath == "" { es = append(es, fmt.Errorf("Key not found: validation_key_path")) } if p.UsePolicyfile && p.PolicyName == "" { es = append(es, fmt.Errorf("Policyfile enabled but key not found: policy_name")) } if p.UsePolicyfile && p.PolicyGroup == "" { es = append(es, fmt.Errorf("Policyfile enabled but key not found: policy_group")) } return ws, es } func (r *ResourceProvisioner) decodeConfig(c *terraform.ResourceConfig) (*Provisioner, error) { p := new(Provisioner) decConf := &mapstructure.DecoderConfig{ ErrorUnused: true, WeaklyTypedInput: true, Result: p, } dec, err := mapstructure.NewDecoder(decConf) if err != nil { return nil, err } // We need to merge both configs into a single map first. Order is // important as we need to make sure interpolated values are used // over raw values. This makes sure that all values are there even // if some still need to be interpolated later on. Without this // the validation will fail when using a variable for a required // parameter (the node_name for example). m := make(map[string]interface{}) for k, v := range c.Raw { m[k] = v } for k, v := range c.Config { m[k] = v } if err := dec.Decode(m); err != nil { return nil, err } if p.Environment == "" { p.Environment = defaultEnv } for i, hint := range p.OhaiHints { hintPath, err := homedir.Expand(hint) if err != nil { return nil, fmt.Errorf("Error expanding the path %s: %v", hint, err) } p.OhaiHints[i] = hintPath } if p.ValidationKeyPath != "" { keyPath, err := homedir.Expand(p.ValidationKeyPath) if err != nil { return nil, fmt.Errorf("Error expanding the validation key path: %v", err) } p.ValidationKeyPath = keyPath } if p.SecretKeyPath != "" { keyPath, err := homedir.Expand(p.SecretKeyPath) if err != nil { return nil, fmt.Errorf("Error expanding the secret key path: %v", err) } p.SecretKeyPath = keyPath } if attrs, ok := c.Config["attributes"]; ok { p.Attributes, err = rawToJSON(attrs) if err != nil { return nil, fmt.Errorf("Error parsing the attributes: %v", err) } } return p, nil } func rawToJSON(raw interface{}) (interface{}, error) { switch s := raw.(type) { case []map[string]interface{}: if len(s) != 1 { return nil, errors.New("unexpected input while parsing raw config to JSON") } var err error for k, v := range s[0] { s[0][k], err = rawToJSON(v) if err != nil { return nil, err } } return s[0], nil default: return raw, nil } } // retryFunc is used to retry a function for a given duration func retryFunc(timeout time.Duration, f func() error) error { finish := time.After(timeout) for { err := f() if err == nil { return nil } log.Printf("Retryable error: %v", err) select { case <-finish: return err case <-time.After(3 * time.Second): } } } func (p *Provisioner) runChefClientFunc( chefCmd string, confDir string) func(terraform.UIOutput, communicator.Communicator) error { return func(o terraform.UIOutput, comm communicator.Communicator) error { fb := path.Join(confDir, firstBoot) var cmd string // Policyfiles do not support chef environments, so don't pass the `-E` flag. if p.UsePolicyfile { cmd = fmt.Sprintf("%s -j %q", chefCmd, fb) } else { cmd = fmt.Sprintf("%s -j %q -E %q", chefCmd, fb, p.Environment) } if p.LogToFile { if err := os.MkdirAll(logfileDir, 0755); err != nil { return fmt.Errorf("Error creating logfile directory %s: %v", logfileDir, err) } logFile := path.Join(logfileDir, p.NodeName) f, err := os.Create(path.Join(logFile)) if err != nil { return fmt.Errorf("Error creating logfile %s: %v", logFile, err) } f.Close() o.Output("Writing Chef Client output to " + logFile) o = p } return p.runCommand(o, comm, cmd) } } // Output implementation of terraform.UIOutput interface func (p *Provisioner) Output(output string) { logFile := path.Join(logfileDir, p.NodeName) f, err := os.OpenFile(logFile, os.O_APPEND|os.O_WRONLY, 0666) if err != nil { log.Printf("Error creating logfile %s: %v", logFile, err) return } defer f.Close() // These steps are needed to remove any ANSI escape codes used to colorize // the output and to make sure we have proper line endings before writing // the string to the logfile. re := regexp.MustCompile(`\x1b\[[0-9;]+m`) output = re.ReplaceAllString(output, "") output = strings.Replace(output, "\r", "\n", -1) if _, err := f.WriteString(output); err != nil { log.Printf("Error writing output to logfile %s: %v", logFile, err) } if err := f.Sync(); err != nil { log.Printf("Error saving logfile %s to disk: %v", logFile, err) } } func (p *Provisioner) deployConfigFiles( o terraform.UIOutput, comm communicator.Communicator, confDir string) error { // Open the validation key file f, err := os.Open(p.ValidationKeyPath) if err != nil { return err } defer f.Close() // Copy the validation key to the new instance if err := comm.Upload(path.Join(confDir, validationKey), f); err != nil { return fmt.Errorf("Uploading %s failed: %v", validationKey, err) } if p.SecretKeyPath != "" { // Open the secret key file s, err := os.Open(p.SecretKeyPath) if err != nil { return err } defer s.Close() // Copy the secret key to the new instance if err := comm.Upload(path.Join(confDir, secretKey), s); err != nil { return fmt.Errorf("Uploading %s failed: %v", secretKey, err) } } // Make strings.Join available for use within the template funcMap := template.FuncMap{ "join": strings.Join, } // Create a new template and parse the client config into it t := template.Must(template.New(clienrb).Funcs(funcMap).Parse(clientConf)) var buf bytes.Buffer err = t.Execute(&buf, p) if err != nil { return fmt.Errorf("Error executing %s template: %s", clienrb, err) } // Copy the client config to the new instance if err := comm.Upload(path.Join(confDir, clienrb), &buf); err != nil { return fmt.Errorf("Uploading %s failed: %v", clienrb, err) } // Create a map with first boot settings fb := make(map[string]interface{}) if p.Attributes != nil { fb = p.Attributes.(map[string]interface{}) } // Check if the run_list was also in the attributes and if so log a warning // that it will be overwritten with the value of the run_list argument. if _, found := fb["run_list"]; found { log.Printf("[WARNING] Found a 'run_list' specified in the configured attributes! " + "This value will be overwritten by the value of the `run_list` argument!") } // Add the initial runlist to the first boot settings if !p.UsePolicyfile { fb["run_list"] = p.RunList } // Marshal the first boot settings to JSON d, err := json.Marshal(fb) if err != nil { return fmt.Errorf("Failed to create %s data: %s", firstBoot, err) } // Copy the first-boot.json to the new instance if err := comm.Upload(path.Join(confDir, firstBoot), bytes.NewReader(d)); err != nil { return fmt.Errorf("Uploading %s failed: %v", firstBoot, err) } return nil } func (p *Provisioner) deployOhaiHints( o terraform.UIOutput, comm communicator.Communicator, hintDir string) error { for _, hint := range p.OhaiHints { // Open the hint file f, err := os.Open(hint) if err != nil { return err } defer f.Close() // Copy the hint to the new instance if err := comm.Upload(path.Join(hintDir, path.Base(hint)), f); err != nil { return fmt.Errorf("Uploading %s failed: %v", path.Base(hint), err) } } return nil } // runCommand is used to run already prepared commands func (p *Provisioner) runCommand( o terraform.UIOutput, comm communicator.Communicator, command string) error { var err error // Unless prevented, prefix the command with sudo if p.useSudo { command = "sudo " + command } outR, outW := io.Pipe() errR, errW := io.Pipe() outDoneCh := make(chan struct{}) errDoneCh := make(chan struct{}) go p.copyOutput(o, outR, outDoneCh) go p.copyOutput(o, errR, errDoneCh) cmd := &remote.Cmd{ Command: command, Stdout: outW, Stderr: errW, } if err := comm.Start(cmd); err != nil { return fmt.Errorf("Error executing command %q: %v", cmd.Command, err) } cmd.Wait() if cmd.ExitStatus != 0 { err = fmt.Errorf( "Command %q exited with non-zero exit status: %d", cmd.Command, cmd.ExitStatus) } // Wait for output to clean up outW.Close() errW.Close() <-outDoneCh <-errDoneCh // If we have an error, return it out now that we've cleaned up if err != nil { return err } return nil } func (p *Provisioner) copyOutput(o terraform.UIOutput, r io.Reader, doneCh chan<- struct{}) { defer close(doneCh) lr := linereader.New(r) for line := range lr.Ch { o.Output(line) } }