Better management of plugins file

- Use file hash to determine if it should be reloaded

src/backend/InvenTree/InvenTree/settings.py

@@ -160,7 +160,8 @@ PLUGIN_RETRY = get_setting(
     'INVENTREE_PLUGIN_RETRY', 'PLUGIN_RETRY', 3, typecast=int
 )  # How often should plugin loading be tried?
 
-PLUGIN_FILE_CHECKED = False  # Was the plugin file checked?
+# Hash of the plugin file (will be updated on each change)
+PLUGIN_FILE_HASH = ''
 
 STATICFILES_DIRS = []
 

src/backend/InvenTree/plugin/installer.py

@@ -103,6 +103,19 @@ def get_install_info(packagename: str) -> str:
     return info
 
 
+def plugins_file_hash():
+    """Return the file hash for the plugins file."""
+    import hashlib
+
+    pf = settings.PLUGIN_FILE
+
+    if not pf or not pf.exists():
+        return None
+
+    with pf.open('rb') as f:
+        return hashlib.md5(f.read()).hexdigest()
+
+
 def install_plugins_file():
     """Install plugins from the plugins file."""
     logger.info('Installing plugins from plugins file')
@@ -127,9 +140,8 @@ def install_plugins_file():
         log_error('pip')
         return False
 
-    # Update static files
+    # Collect plugin static files
     plugin.staticfiles.collect_plugins_static_files()
-    plugin.staticfiles.clear_plugins_static_files()
 
     # At this point, the plugins file has been installed
     return True

src/backend/InvenTree/plugin/registry.py

@@ -287,6 +287,7 @@ class PluginsRegistry:
 
             if collect:
                 logger.info('Collecting plugins')
+                self.install_plugin_file()
                 self.plugin_modules = self.collect_plugins()
 
             self.plugins_loaded = False
@@ -430,16 +431,13 @@ class PluginsRegistry:
 
     def install_plugin_file(self):
         """Make sure all plugins are installed in the current environment."""
-        if settings.PLUGIN_FILE_CHECKED:
-            logger.info('Plugin file was already checked')
-            return True
+        from plugin.installer import install_plugins_file, plugins_file_hash
 
-        from plugin.installer import install_plugins_file
+        file_hash = plugins_file_hash()
 
-        if install_plugins_file():
-            settings.PLUGIN_FILE_CHECKED = True
-            return 'first_run'
-        return False
+        if file_hash != settings.PLUGIN_FILE_HASH:
+            install_plugins_file()
+            settings.PLUGIN_FILE_HASH = file_hash
 
     # endregion