Fix container running state detection for different Docker API versions

- Handle both string and hash formats for container.info['State']
- Add fallback to container.json['State'] when needed
- Fix "Container not running" error when containers are actually running
- Support multiple Docker API response formats

The Docker API gem can return State as either:
- A simple string: "running"
- A hash: {"Status": "running", "Running": true, ...}

This fix ensures compatibility with different Docker daemon versions
and API response formats.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

app/lib/baktainer/container.rb

@@ -39,11 +39,32 @@ class Baktainer::Container
   end
 
   def state
-    @container.info['State']&.[]('Status')
+    # Handle different Docker API response formats
+    state_data = @container.info['State']
+    
+    if state_data.is_a?(String)
+      state_data
+    elsif state_data.is_a?(Hash)
+      state_data['Status']
+    else
+      # Fallback to json method if info doesn't provide expected format
+      @container.json['State']['Status'] rescue 'unknown'
+    end
   end
 
   def running?
-    state == 'running'
+    # Check multiple ways to determine if container is running
+    state_data = @container.info['State']
+    
+    if state_data.is_a?(String)
+      state_data == 'running'
+    elsif state_data.is_a?(Hash)
+      state_data['Status'] == 'running' || state_data['Running'] == true
+    else
+      # Fallback to json method
+      json_state = @container.json['State'] rescue nil
+      json_state && (json_state['Status'] == 'running' || json_state['Running'] == true)
+    end
   end
 
   def engine

app/lib/baktainer/container_validator.rb

@@ -99,8 +99,22 @@ class Baktainer::ContainerValidator
   end
 
   def validate_container_running
-    state = @container.info['State']&.[]('Status')
-    if state.nil? || state != 'running'
+    # Check both possible state formats - Docker API can return different structures
+    state = @container.info['State']
+    
+    # If State is a string, use it directly
+    if state.is_a?(String)
+      running = state == 'running'
+    # If State is a hash, check the Status field
+    elsif state.is_a?(Hash)
+      running = state['Status'] == 'running' || state['Running'] == true
+    # Otherwise check the json method which returns full state
+    else
+      json_state = @container.json['State'] rescue nil
+      running = json_state && (json_state['Status'] == 'running' || json_state['Running'] == true)
+    end
+    
+    unless running
       raise Baktainer::ValidationError, 'Container not running'
     end
   end