add -sync-only flag

docs/command-line-flags.md

@@ -23,6 +23,7 @@ Usage of confd:
   -prefix="/": key path prefix
   -scheme="http": the backend URI scheme (http or https)
   -srv-domain="": the name of the resource record
+  -syc-only=false: sync without check_cmd and reload_cmd
   -version=false: print version and exit
   -watch=false: enable watch support
 ```

docs/configuration-guide.md

@@ -19,6 +19,7 @@ Optional:
 * `prefix` (string) - The string to prefix to keys. ("/")
 * `scheme` (string) - The backend URI scheme. ("http" or "https")
 * `srv_domain` (string) - The name of the resource record.
+* `sync-only` (bool) - sync without check_cmd and reload_cmd.
 * `watch` (bool) - Enable watch support.
 
 Example:

src/github.com/kelseyhightower/confd/config.go

@@ -37,6 +37,7 @@ var (
 	printVersion      bool
 	scheme            string
 	srvDomain         string
+	syncOnly          bool
 	table             string
 	templateConfig    template.Config
 	backendsConfig    backends.Config
@@ -57,6 +58,7 @@ type Config struct {
 	Prefix       string   `toml:"prefix"`
 	SRVDomain    string   `toml:"srv_domain"`
 	Scheme       string   `toml:"scheme"`
+	SyncOnly     bool     `toml:"sync-only"`
 	Table        string   `toml:"table"`
 	LogLevel     string   `toml:"log-level"`
 	Watch        bool     `toml:"watch"`
@@ -80,6 +82,7 @@ func init() {
 	flag.BoolVar(&printVersion, "version", false, "print version and exit")
 	flag.StringVar(&scheme, "scheme", "http", "the backend URI scheme (http or https)")
 	flag.StringVar(&srvDomain, "srv-domain", "", "the name of the resource record")
+	flag.BoolVar(&syncOnly, "sync-only", false, "sync without check_cmd and reload_cmd")
 	flag.StringVar(&table, "table", "", "the name of the DynamoDB table (only used with -backend=dynamodb)")
 	flag.BoolVar(&watch, "watch", false, "enable watch support")
 }
@@ -192,6 +195,7 @@ func initConfig() error {
 		KeepStageFile: keepStageFile,
 		Noop:          config.Noop,
 		Prefix:        config.Prefix,
+		SyncOnly:      config.SyncOnly,
 		TemplateDir:   filepath.Join(config.ConfDir, "templates"),
 	}
 	return nil
@@ -261,6 +265,8 @@ func setConfigFromFlag(f *flag.Flag) {
 		config.Scheme = scheme
 	case "srv-domain":
 		config.SRVDomain = srvDomain
+	case "sync-only":
+		config.SyncOnly = syncOnly
 	case "table":
 		config.Table = table
 	case "log-level":

src/github.com/kelseyhightower/confd/resource/template/resource.go

@@ -26,6 +26,7 @@ type Config struct {
 	Noop          bool
 	Prefix        string
 	StoreClient   backends.StoreClient
+	SyncOnly      bool
 	TemplateDir   string
 }
 
@@ -54,6 +55,7 @@ type TemplateResource struct {
 	prefix        string
 	store         memkv.Store
 	storeClient   backends.StoreClient
+	syncOnly      bool
 }
 
 var ErrEmptySrc = errors.New("empty src template")
@@ -75,6 +77,7 @@ func NewTemplateResource(path string, config Config) (*TemplateResource, error)
 	tr.storeClient = config.StoreClient
 	tr.funcMap = newFuncMap()
 	tr.store = memkv.New()
+	tr.syncOnly = config.SyncOnly
 	addFuncs(tr.funcMap, tr.store.FuncMap)
 	tr.prefix = filepath.Join("/", config.Prefix, tr.Prefix)
 	if tr.Src == "" {
@@ -162,7 +165,7 @@ func (t *TemplateResource) sync() error {
 	}
 	if !ok {
 		log.Info("Target config " + t.Dest + " out of sync")
-		if t.CheckCmd != "" {
+		if !t.syncOnly && t.CheckCmd != "" {
 			if err := t.check(); err != nil {
 				return errors.New("Config check failed: " + err.Error())
 			}
@@ -189,7 +192,7 @@ func (t *TemplateResource) sync() error {
 				return err
 			}
 		}
-		if t.ReloadCmd != "" {
+		if !t.syncOnly && t.ReloadCmd != "" {
 			if err := t.reload(); err != nil {
 				return err
 			}