retry

main.go

@@ -32,6 +32,8 @@ func main() {
     for _, container := range containers {
         project := container.Labels["com.docker.compose.project"]
         stackNamespace := container.Labels["com.docker.stack.namespace"]
+
+        // Use project name if available; otherwise, use stack namespace
         stackKey := project
         if stackNamespace != "" {
             stackKey = stackNamespace
@@ -61,12 +63,24 @@ func main() {
         log.Fatalf("Stack or project '%s' not found.", *stackName)
     }
 
-    // Export the specified stack/project to a docker-compose.yml file
+    // Determine if this is a Docker Swarm stack or a Docker Compose project
-    err = exportStackToComposeFile(*stackName, containers, *outputFile)
+    isSwarm := isDockerSwarmStack(*stackName, containers)
-    if err != nil {
+
-        log.Fatalf("Error exporting stack %s: %v", *stackName, err)
+    if isSwarm {
+        // Handle Docker Swarm stack export
+        err = exportSwarmStackToComposeFile(*stackName, *outputFile)
+        if err != nil {
+            log.Fatalf("Error exporting Docker Swarm stack %s: %v", *stackName, err)
+        }
+        fmt.Printf("docker-compose.yml generated successfully for Docker Swarm stack '%s' in %s\n", *stackName, *outputFile)
+    } else {
+        // Handle Docker Compose project export
+        err = exportComposeProjectToComposeFile(*stackName, containers, *outputFile)
+        if err != nil {
+            log.Fatalf("Error exporting Docker Compose project %s: %v", *stackName, err)
+        }
+        fmt.Printf("docker-compose.yml generated successfully for Docker Compose project '%s' in %s\n", *stackName, *outputFile)
     }
-    fmt.Printf("docker-compose.yml generated successfully for stack '%s' in %s\n", *stackName, *outputFile)
 }
 
 // Container represents basic Docker container information.
@@ -95,8 +109,8 @@ func listContainers() ([]Container, error) {
     for scanner.Scan() {
         fields := strings.Fields(scanner.Text())
 
-        // Check that there are at least 5 fields before accessing them
+        // Check that there are at least 3 fields (ID, Name, Image)
-        if len(fields) < 5 {
+        if len(fields) < 3 {
             log.Printf("Warning: Skipping incomplete line: %s", scanner.Text())
             continue
         }
@@ -104,9 +118,20 @@ func listContainers() ([]Container, error) {
         id := fields[0]
         name := fields[1]
         image := fields[2]
+
+        // Handle cases where project or stackNamespace might be missing
+        project := ""
+        stackNamespace := ""
+        if len(fields) > 3 {
+            project = fields[3]
+        }
+        if len(fields) > 4 {
+            stackNamespace = fields[4]
+        }
+
         labels := map[string]string{
-            "com.docker.compose.project": fields[3],
+            "com.docker.compose.project": project,
-            "com.docker.stack.namespace":  fields[4],
+            "com.docker.stack.namespace":  stackNamespace,
         }
 
         // Run 'docker inspect' to get detailed container information.
@@ -139,15 +164,89 @@ func inspectContainer(containerID string) ([]string, []string, error) {
         return nil, nil, err
     }
 
+    // Split output into environment variables and network names
     parts := strings.Split(out.String(), "  ")
+    if len(parts) < 2 {
+        // Handle cases where no networks are listed
+        parts = append(parts, "")
+    }
     envVars := strings.Fields(parts[0])
     networks := strings.Fields(parts[1])
 
     return envVars, networks, nil
 }
 
-// exportStackToComposeFile generates a docker-compose.yml for a given stack or project.
+// isDockerSwarmStack checks if the stack is a Docker Swarm stack based on the container names.
-func exportStackToComposeFile(stack string, containers []Container, outputFile string) error {
+func isDockerSwarmStack(stackName string, containers []Container) bool {
+    for _, container := range containers {
+        if strings.Contains(container.Name, ".") {
+            return true
+        }
+    }
+    return false
+}
+
+// exportSwarmStackToComposeFile exports a Docker Swarm stack to a docker-compose.yml file.
+func exportSwarmStackToComposeFile(stackName string, outputFile string) error {
+    // Fetch stack details using `docker stack services` and construct the docker-compose.yml
+    cmd := exec.Command("docker", "stack", "services", stackName, "--format", "{{.Name}} {{.Image}} {{.Ports}} {{.Replicas}}")
+    var out bytes.Buffer
+    cmd.Stdout = &out
+    err := cmd.Run()
+    if err != nil {
+        return fmt.Errorf("error fetching Docker Swarm stack services: %v", err)
+    }
+
+    composeConfig := make(map[string]interface{})
+    composeConfig["services"] = make(map[string]interface{})
+
+    scanner := bufio.NewScanner(&out)
+    for scanner.Scan() {
+        fields := strings.Fields(scanner.Text())
+        if len(fields) < 2 {
+            continue
+        }
+
+        serviceName := fields[0]
+        image := fields[1]
+
+        serviceConfig := map[string]interface{}{
+            "image": image,
+        }
+
+        // Handle additional fields like ports and replicas
+        if len(fields) > 2 {
+            // Parse ports and replicas if available
+            ports := fields[2]
+            replicas := fields[3]
+            serviceConfig["deploy"] = map[string]interface{}{
+                "replicas": replicas,
+            }
+            if ports != "" {
+                serviceConfig["ports"] = []string{ports}
+            }
+        }
+
+        composeConfig["services"].(map[string]interface{})[serviceName] = serviceConfig
+    }
+
+    // Convert to YAML
+    yamlData, err := yaml.Marshal(&composeConfig)
+    if err != nil {
+        return fmt.Errorf("error generating YAML for Docker Swarm stack %s: %v", stackName, err)
+    }
+
+    // Write YAML to a file
+    err = os.WriteFile(outputFile, yamlData, 0644)
+    if err != nil {
+        return fmt.Errorf("error writing to file %s: %v", outputFile, err)
+    }
+
+    return nil
+}
+
+// exportComposeProjectToComposeFile exports a Docker Compose project to a docker-compose.yml file.
+func exportComposeProjectToComposeFile(stack string, containers []Container, outputFile string) error {
     // Map to hold docker-compose configuration
     composeConfig := make(map[string]interface{})
     composeConfig["services"] = make(map[string]interface{})
@@ -179,7 +278,7 @@ func exportStackToComposeFile(stack string, containers []Container, outputFile s
     // Convert to YAML
     yamlData, err := yaml.Marshal(&composeConfig)
     if err != nil {
-        return fmt.Errorf("error generating YAML for stack %s: %v", stack, err)
+        return fmt.Errorf("error generating YAML for Docker Compose project %s: %v", stack, err)
     }
 
     // Write YAML to a file