From 85b9e4eb94b6947afa4864e0ab26a259aa3411f3 Mon Sep 17 00:00:00 2001
From: Raphael Michel <michel@rami.io>
Date: Mon, 31 May 2021 13:24:18 +0200
Subject: [PATCH] Prevent missing stylesheets in cloned events

---
 src/pretix/base/models/event.py | 9 +++++++++
 src/pretix/presale/style.py     | 4 ++--
 2 files changed, 11 insertions(+), 2 deletions(-)

diff --git a/src/pretix/base/models/event.py b/src/pretix/base/models/event.py
index 4196b1d729..fc94d5fc1b 100644
--- a/src/pretix/base/models/event.py
+++ b/src/pretix/base/models/event.py
@@ -640,6 +640,7 @@ class Event(EventMixin, LoggedModel):
         ), tz)
 
     def copy_data_from(self, other):
+        from pretix.presale.style import regenerate_css
         from ..signals import event_copy_data
         from . import (
             Item, ItemAddOn, ItemBundle, ItemCategory, ItemMetaValue, Question,
@@ -819,9 +820,14 @@ class Event(EventMixin, LoggedModel):
                 s.product = item_map[s.product_id]
             s.save()
 
+        has_custom_style = other.settings.presale_css_file or other.settings.presale_widget_css_file
         skip_settings = (
             'ticket_secrets_pretix_sig1_pubkey',
             'ticket_secrets_pretix_sig1_privkey',
+            'presale_css_file',
+            'presale_css_checksum',
+            'presale_widget_css_file',
+            'presale_widget_css_checksum',
         )
         for s in other.settings._objects.all():
             if s.key in skip_settings:
@@ -856,6 +862,9 @@ class Event(EventMixin, LoggedModel):
             question_map=question_map, checkin_list_map=checkin_list_map
         )
 
+        if has_custom_style:
+            regenerate_css.apply_async(args=(self.pk,))
+
     def get_payment_providers(self, cached=False) -> dict:
         """
         Returns a dictionary of initialized payment providers mapped by their identifiers.
diff --git a/src/pretix/presale/style.py b/src/pretix/presale/style.py
index d15e070c0e..fe14cd68a4 100644
--- a/src/pretix/presale/style.py
+++ b/src/pretix/presale/style.py
@@ -144,7 +144,7 @@ def regenerate_css(event):
         newname = default_storage.save(fname, ContentFile(css.encode('utf-8')))
         event.settings.set('presale_css_file', newname)
         event.settings.set('presale_css_checksum', checksum)
-        if old_fname and old_fname != newname:
+        if old_fname and old_fname != newname and f'/{event.slug}/' in old_fname:
             delete_old_file(old_fname)
 
     # widget.scss
@@ -156,7 +156,7 @@ def regenerate_css(event):
         newname = default_storage.save(fname, ContentFile(css.encode('utf-8')))
         event.settings.set('presale_widget_css_file', newname)
         event.settings.set('presale_widget_css_checksum', checksum)
-        if old_fname and old_fname != newname:
+        if old_fname and old_fname != newname and f'/{event.slug}/' in old_fname:
             delete_old_file(old_fname)