add before and after hooks

README.md

@@ -97,7 +97,9 @@ Full applet spec:
 - `env_file` list
 - `all_envs` bool (loads all local environment variables)
 - `env_filter` string (regex to filter environment variables when using `all_envs`)
-- `dependencies` list (list of applets to run first)
+- `dependencies` (deprecated - use `before_hooks` instead)
+- `before_hooks` list (list of applets to run first)
+- `after_hooks` list (list of applets to run after)
 - `links` list
 - `image` string
 - `image_tag` string

main.go

@@ -46,12 +46,32 @@ func main() {
 			a.PreExec()
 		}
 
-		Exec(r, a, args...)
+		err := Exec(r, a, args...)
+		if err != nil {
+			fmt.Print(err)
+			os.Exit(1)
+		}
 	}
 }
 
 func Exec(r *repo.Repo, a repo.Applet, args ...string) error {
-	for _, dep := range a.Dependencies {
+	for _, dep := range a.BeforeHooks {
+		d, ok := r.Applets[dep]
+		if !ok {
+			return fmt.Errorf("dependency %s not found", dep)
+		}
+		err := Exec(r, d)
+		if err != nil {
+			return err
+		}
+	}
+
+	err := a.Exec(args...)
+	if err != nil {
+		return err
+	}
+
+	for _, dep := range a.AfterHooks {
 		d, ok := r.Applets[dep]
 		if !ok {
 			return fmt.Errorf("dependency %s not found", dep)
@@ -62,5 +82,5 @@ func Exec(r *repo.Repo, a repo.Applet, args ...string) error {
 		}
 	}
 
-	return a.Exec(args...)
+	return nil
 }

repo/applet.go

@@ -32,6 +32,8 @@ type Applet struct {
 	Ports        []string `yaml:"ports"`
 	EnvFile      []string `yaml:"env_file"`
 	Dependencies []string `yaml:"dependencies"`
+	BeforeHooks  []string `yaml:"before_hooks"`
+	AfterHooks   []string `yaml:"after_hooks"`
 	Links        []string `yaml:"links"`
 
 	Image string `yaml:"image"`
@@ -73,6 +75,9 @@ func (a *Applet) UnmarshalYAML(unmarshal func(interface{}) error) error {
 		return err
 	}
 
+	raw.BeforeHooks = append(raw.Dependencies, raw.BeforeHooks...)
+	raw.Dependencies = nil
+
 	*a = Applet(raw)
 	return nil
 }