assetmanager: rename icons dir to markers, symlink

This fixes a name collision with Apache's default config.

Closes #1773. Install nginx already.

docs/signs.rst

@@ -156,7 +156,7 @@ Here is a more complex example where not every marker of a certain id has a cert
                         'y':85,
                         'z':-234,
                         'name':'Bar'}],
-        'markers': [dict(name="Towns", filterFunction=townFilter, icon="icons/marker_town.png")],
+        'markers': [dict(name="Towns", filterFunction=townFilter, icon="markers/marker_town.png")],
         ### Note: The 'icon' parameter allows you to specify a custom icon, as per
         ###       standard markers. This icon must exist in the same folder as your
         ###       custom webassets or in the same folder as the generated index.html
@@ -271,7 +271,7 @@ Marker Icons Overviewer ships by default
 ========================================
 
 Overviewer comes with multiple small icons that you can use for your markers.
-You can find them in the ``overviewer_core/data/web_assets/icons`` directory.
+You can find them in the ``overviewer_core/data/web_assets/markers`` directory.
 
 If you want to make your own in the same style, you can use the provided
 ``marker_base_plain.svg`` and ``marker_base_plain_red.svg`` as template, with

overviewer_core/assetmanager.py

@@ -98,10 +98,10 @@ top-level directory.
             'defaultMarker':    'signpost.png',
             'signMarker':       'signpost_icon.png',
             'bedMarker':        'bed.png',
-            'spawnMarker':      'icons/marker_home.png',
-            'spawnMarker2x':    'icons/marker_home_2x.png',
-            'queryMarker':      'icons/marker_location.png',
-            'queryMarker2x':    'icons/marker_location_2x.png'
+            'spawnMarker':      'markers/marker_home.png',
+            'spawnMarker2x':    'markers/marker_home_2x.png',
+            'queryMarker':      'markers/marker_location.png',
+            'queryMarker2x':    'markers/marker_location_2x.png'
         }
         dump['CONST']['mapDivId'] = 'mcmap'
         dump['CONST']['UPPERLEFT'] = world.UPPER_LEFT
@@ -174,6 +174,14 @@ top-level directory.
             mirror_dir(self.custom_assets_dir, self.outputdir, capabilities=self.fs_caps,
                        force_writable=True)
 
+        # symlink old icons dir because apache sux
+        if (os.name == "posix" and os.symlink in os.supports_dir_fd and
+            not os.path.islink(os.path.join(self.outputdir, "icons"))):
+            od_fd = os.open(self.outputdir, os.O_DIRECTORY)
+            try:
+                os.symlink("markers", "icons", target_is_directory=True, dir_fd=od_fd)
+            finally:
+                os.close(od_fd)
         # write a dummy baseMarkers.js if none exists
         basemarkers_path = os.path.join(self.outputdir, "baseMarkers.js")
         if not os.path.exists(basemarkers_path):