Ensure case changes are taken into account for folders in case-insensitive file systems

src/calibre/library/database2.py

@@ -433,6 +433,27 @@ class LibraryDatabase2(LibraryDatabase, SchemaUpgrade, CustomColumns):
                 parent  = os.path.dirname(spath)
                 if len(os.listdir(parent)) == 0:
                     self.rmtree(parent, permanent=True)
+        curpath = self.library_path
+        if not self.is_case_sensitive:
+            # On case-insensitive systems, title and author renames that only
+            # change case don't cause any changes to the directories in the file
+            # system. This can lead to having the directory names not match the
+            # title/author, which leads to trouble when libraries are copied to
+            # a case-sensitive system. The following code fixes this by checking
+            # each segment. If they are different (must be because of case),
+            # then rename the segment to some temp file name, then rename it
+            # back to the correct name. Note that the code above correctly
+            # handles files in the directories, so no need to do them here.
+            for oldseg,newseg in zip(current_path.split('/'), path.split('/')):
+                if oldseg != newseg:
+                    while True:
+                        # need a temp name in the current segment for renames
+                        tempname = 'TEMP.%f'%time.time()
+                        if not os.path.exists(os.path.join(curpath, tempname)):
+                            break
+                    os.rename(os.path.join(curpath, oldseg), tempname)
+                    os.rename(tempname, os.path.join(curpath, newseg))
+                curpath = os.path.join(curpath, newseg)
 
     def add_listener(self, listener):
         '''