helmfile should be non-interactive by default (#368)

Request for user confirmation only when a global `--interactive` flag is provided.

Resolves #354

README.md

@@ -170,7 +170,7 @@ releases:
 Sync your Kubernetes cluster state to the desired one by running:
 
 ```console
-helmfile sync
+helmfile apply
 ```
 
 Congratulations! You now have your first Prometheus deployment running inside your cluster.
@@ -190,6 +190,7 @@ COMMANDS:
      repos     sync repositories from state file (helm repo add && helm repo update)
      charts    sync releases from state file (helm upgrade --install)
      diff      diff releases from state file against env (helm diff)
+     template  template releases from state file against env (helm template)
      lint      lint charts from state file (helm lint)
      sync      sync all resources from state file (repos, releases and chart deps)
      apply     apply all resources from state file only when there are changes
@@ -200,6 +201,7 @@ COMMANDS:
 GLOBAL OPTIONS:
    --helm-binary value, -b value           path to helm binary
    --file helmfile.yaml, -f helmfile.yaml  load config from file or directory. defaults to helmfile.yaml or `helmfile.d`(means `helmfile.d/*.yaml`) in this preference
+   --environment default, -e default       specify the environment name. defaults to default
    --quiet, -q                             Silence output. Equivalent to log-level warn
    --kube-context value                    Set kubectl context. Uses current context by default
    --log-level value                       Set log level, default info
@@ -208,6 +210,7 @@ GLOBAL OPTIONS:
                                            A release must match all labels in a group in order to be used. Multiple groups can be specified at once.
                                            --selector tier=frontend,tier!=proxy --selector tier=backend. Will match all frontend, non-proxy releases AND all backend releases.
                                            The name of a release can be used as a label. --selector name=myrelease
+   --interactive, -i                       Request confirmation before attempting to modify clusters
    --help, -h                              show help
    --version, -v                           print the version
 ```
@@ -707,6 +710,14 @@ set -a; . .env; set +a; helmfile sync
 
 Please see #203 for more context.
 
+## Running helmfile interactively
+
+`helmfile --interactive [apply|delete]` requests confirmation from you before actually modifying your cluster.
+
+Use it when you're running `helmfile` manually on your local machine or a kind of secure administrative hosts.
+
+For your local use-case, aliasing it like `alias hi='helmfile --interactive'` would be convenient.
+
 ## Running helmfile without an Internet connection
 
 Once you download all required charts into your machine, you can run `helmfile charts` to deploy your apps.

main.go

@@ -99,6 +99,10 @@ func main() {
 	--selector tier=frontend,tier!=proxy --selector tier=backend. Will match all frontend, non-proxy releases AND all backend releases.
 	The name of a release can be used as a label. --selector name=myrelease`,
 		},
+		cli.BoolFlag{
+			Name:  "interactive, i",
+			Usage: "Request confirmation before attempting to modify clusters",
+		},
 	}
 
 	app.Before = configureLogging
@@ -319,10 +323,6 @@ func main() {
 					Value: "",
 					Usage: "pass args to helm exec",
 				},
-				cli.BoolFlag{
-					Name:  "auto-approve",
-					Usage: "Skip interactive approval before applying",
-				},
 				cli.BoolFlag{
 					Name:  "suppress-secrets",
 					Usage: "suppress secrets in the diff output. highly recommended to specify on CI/CD use-cases",
@@ -386,8 +386,8 @@ Do you really want to apply?
   Helmfile will apply all your changes, as shown above.
 
 `, strings.Join(names, "\n"))
-							autoApprove := c.Bool("auto-approve")
-							if autoApprove || !autoApprove && askForConfirmation(msg) {
+							interactive := c.GlobalBool("interactive")
+							if !interactive || interactive && askForConfirmation(msg) {
 								rs := []state.ReleaseSpec{}
 								for _, r := range releases {
 									rs = append(rs, *r)
@@ -443,10 +443,6 @@ Do you really want to apply?
 					Value: "",
 					Usage: "pass args to helm exec",
 				},
-				cli.BoolFlag{
-					Name:  "auto-approve",
-					Usage: "Skip interactive approval before deleting",
-				},
 				cli.BoolFlag{
 					Name:  "purge",
 					Usage: "purge releases i.e. free release names and histories",
@@ -473,8 +469,8 @@ Do you really want to delete?
   Helmfile will delete all your releases, as shown above.
 
 `, strings.Join(names, "\n"))
-					autoApprove := c.Bool("auto-approve")
-					if autoApprove || !autoApprove && askForConfirmation(msg) {
+					interactive := c.GlobalBool("interactive")
+					if !interactive || interactive && askForConfirmation(msg) {
 						return state.DeleteReleases(helm, purge)
 					}
 					return nil