add knecht

knecht/cmd/update.go

@@ -0,0 +1,85 @@
+package cmd
+
+import (
+	"fmt"
+
+	"github.com/jensbecker/homelab/knecht/portainer"
+	"github.com/jensbecker/homelab/knecht/stack"
+	"github.com/spf13/cobra"
+)
+
+var updateCmd = &cobra.Command{
+	Use:   "update <stack>",
+	Short: "Update an existing stack, preserving env vars",
+	Args:  cobra.ExactArgs(1),
+	RunE: func(cmd *cobra.Command, args []string) error {
+		_, client, svcPath, err := setup()
+		if err != nil {
+			return err
+		}
+
+		name := args[0]
+		local, err := stack.Get(svcPath, name)
+		if err != nil {
+			return err
+		}
+
+		remote, err := client.GetStackByName(name)
+		if err != nil {
+			return err
+		}
+		if remote == nil {
+			return fmt.Errorf("stack %q not found — use `knecht deploy %s` to create it", name, name)
+		}
+
+		compose, err := local.ReadCompose()
+		if err != nil {
+			return err
+		}
+
+		// Check for missing env keys and prompt for values
+		exampleKeys, err := local.EnvExampleKeys()
+		if err != nil {
+			return err
+		}
+		env, err := mergeEnvVars(remote.Env, exampleKeys)
+		if err != nil {
+			return err
+		}
+
+		s, err := client.UpdateStack(remote.ID, compose, env)
+		if err != nil {
+			return err
+		}
+		fmt.Printf("Updated stack %q (id %d)\n", s.Name, s.ID)
+		return nil
+	},
+}
+
+// mergeEnvVars takes existing Portainer env vars and prompts for any keys
+// present in .env.example but missing from Portainer.
+func mergeEnvVars(existing []portainer.EnvVar, exampleKeys []string) ([]portainer.EnvVar, error) {
+	envMap := make(map[string]string, len(existing))
+	for _, e := range existing {
+		envMap[e.Name] = e.Value
+	}
+
+	for _, key := range exampleKeys {
+		if _, ok := envMap[key]; !ok {
+			fmt.Printf("Missing env var %q — enter value (leave empty to skip): ", key)
+			var val string
+			fmt.Scanln(&val)
+			envMap[key] = val
+		}
+	}
+
+	result := make([]portainer.EnvVar, 0, len(envMap))
+	for k, v := range envMap {
+		result = append(result, portainer.EnvVar{Name: k, Value: v})
+	}
+	return result, nil
+}
+
+func init() {
+	rootCmd.AddCommand(updateCmd)
+}