From 85429c25de0102dbedbbbf14d24350430adbe495 Mon Sep 17 00:00:00 2001
From: "copilot-swe-agent[bot]" <198982749+Copilot@users.noreply.github.com>
Date: Tue, 31 Mar 2026 04:20:43 +0000
Subject: [PATCH] Fix cover not being set when adding files to existing book
 records with no cover

Agent-Logs-Url: https://github.com/kovidgoyal/calibre/sessions/aa4abbc0-5dd8-4380-a760-ace343a70589

Co-authored-by: kovidgoyal <1308621+kovidgoyal@users.noreply.github.com>
---
 src/calibre/db/copy_to_library.py |  2 ++
 src/calibre/gui2/actions/add.py   | 12 ++++++++++++
 src/calibre/gui2/add.py           |  6 ++++++
 3 files changed, 20 insertions(+)

diff --git a/src/calibre/db/copy_to_library.py b/src/calibre/db/copy_to_library.py
index 40eb0fcd81..646826b1fb 100644
--- a/src/calibre/db/copy_to_library.py
+++ b/src/calibre/db/copy_to_library.py
@@ -20,6 +20,8 @@ def automerge_book(automerge_action, book_id, mi, identical_book_list, newdb, fo
                 at_least_one_format_added = True
         if at_least_one_format_added and extra_file_map:
             newdb.add_extra_files(identical_book, extra_file_map, replace=False, auto_rename=True)
+        if mi.cover_data and mi.cover_data[1] and not newdb.field_for('cover', identical_book):
+            newdb.set_cover({identical_book: mi.cover_data[1]})
 
     if automerge_action == 'new record':
         incoming_fmts = {fmt.upper() for fmt in format_map}
diff --git a/src/calibre/gui2/actions/add.py b/src/calibre/gui2/actions/add.py
index ca883c3889..51c724e01f 100644
--- a/src/calibre/gui2/actions/add.py
+++ b/src/calibre/gui2/actions/add.py
@@ -194,6 +194,18 @@ class AddAction(InterfaceAction):
                 if fmt:
                     db.add_format_with_hooks(id_, fmt, fpath, index_is_id=True,
                         notify=True)
+            if not db.has_cover(id_):
+                from calibre.ebooks.metadata.meta import get_metadata
+                for fmt, fpath in fmt_map.items():
+                    if fmt:
+                        try:
+                            with open(fpath, 'rb') as f:
+                                mi = get_metadata(f, stream_type=fmt.lower())
+                            if mi.cover_data and mi.cover_data[1]:
+                                db.new_api.set_cover({id_: mi.cover_data[1]})
+                                break
+                        except Exception:
+                            pass
         current_idx = self.gui.library_view.currentIndex()
         if current_idx.isValid():
             self.gui.library_view.model().current_changed(current_idx, current_idx)
diff --git a/src/calibre/gui2/add.py b/src/calibre/gui2/add.py
index 3de98a55c1..2b223dbc6c 100644
--- a/src/calibre/gui2/add.py
+++ b/src/calibre/gui2/add.py
@@ -420,11 +420,17 @@ class Adder(QObject):
         seen_fmts = set()
         replace = gprefs['automerge'] == 'overwrite'
         cover_removed = False
+        cdata = None
         for identical_book_id in identical_book_ids:
             ib_fmts = {fmt.upper() for fmt in self.db.formats(identical_book_id)}
             seen_fmts |= ib_fmts
             self.add_formats(identical_book_id, paths, mi, replace=replace)
             self.merged_formats_added_to.add(identical_book_id)
+            if cover_path and not self.db.field_for('cover', identical_book_id):
+                if cdata is None:
+                    with open(cover_path, 'rb') as f:
+                        cdata = f.read()
+                self.db.set_cover({identical_book_id: cdata})
         if gprefs['automerge'] == 'new record':
             incoming_fmts = {path.rpartition(os.extsep)[-1].upper() for path in paths}
             if incoming_fmts.intersection(seen_fmts):