From 2149626bef57b8ec1bd3edea537dc4e8e7548d10 Mon Sep 17 00:00:00 2001
From: robertxgray <robertxgray@gmail.com>
Date: Fri, 19 Mar 2021 17:13:53 +0100
Subject: Improved filesystem check on dnd

---
 libcaja-private/caja-dnd.c            | 42 +++++++++++++++++++++++------------
 libcaja-private/caja-file-utilities.c | 36 ++++++++++++++++++++++++++++++
 libcaja-private/caja-file-utilities.h |  2 ++
 3 files changed, 66 insertions(+), 14 deletions(-)

diff --git a/libcaja-private/caja-dnd.c b/libcaja-private/caja-dnd.c
index 796753e4..c6a4ed19 100644
--- a/libcaja-private/caja-dnd.c
+++ b/libcaja-private/caja-dnd.c
@@ -374,29 +374,43 @@ caja_drag_default_drop_action_for_netscape_url (GdkDragContext *context)
 }
 
 static gboolean
-check_same_fs (CajaFile *file1,
-               CajaFile *file2)
+check_same_fs (const char *target_uri, 
+               CajaFile *target_file,
+               const char *dropped_uri,
+               CajaFile *dropped_file)
 {
     gboolean result;
 
     result = FALSE;
 
-    if (file1 != NULL && file2 != NULL)
-    {
-        char *id1, *id2;
+    char *target_fs = NULL, *dropped_fs = NULL;
 
-        id1 = caja_file_get_filesystem_id (file1);
-        id2 = caja_file_get_filesystem_id (file2);
+    if (target_file != NULL)
+    {
+        target_fs = caja_file_get_filesystem_id (target_file);
+    }
+    if (target_fs == NULL)
+    {
+        target_fs = caja_get_filesystem_id_by_uri (target_uri, TRUE);
+    }
 
-        if (id1 != NULL && id2 != NULL)
-        {
-            result = (strcmp (id1, id2) == 0);
-        }
+    if (dropped_file != NULL && !caja_file_is_symbolic_link (dropped_file))
+    {
+        dropped_fs = caja_file_get_filesystem_id (dropped_file);
+    }
+    if (dropped_fs == NULL)
+    {
+        dropped_fs = caja_get_filesystem_id_by_uri (dropped_uri, FALSE);
+    }
 
-        g_free (id1);
-        g_free (id2);
+    if (target_fs != NULL && dropped_fs != NULL)
+    {
+        result = (strcmp (target_fs, dropped_fs) == 0);
     }
 
+    g_free (target_fs);
+    g_free (dropped_fs);
+
     return result;
 }
 
@@ -519,7 +533,7 @@ caja_drag_default_drop_action_for_icons (GdkDragContext *context,
         target = g_file_new_for_uri (target_uri_string);
     }
 
-    same_fs = check_same_fs (target_file, dropped_file);
+    same_fs = check_same_fs (target_uri_string, target_file, dropped_uri, dropped_file);
 
     caja_file_unref (dropped_file);
     caja_file_unref (target_file);
diff --git a/libcaja-private/caja-file-utilities.c b/libcaja-private/caja-file-utilities.c
index 0049514f..13a300a0 100644
--- a/libcaja-private/caja-file-utilities.c
+++ b/libcaja-private/caja-file-utilities.c
@@ -1299,6 +1299,42 @@ caja_restore_files_from_trash (GList *files,
     caja_file_list_unref (unhandled_files);
 }
 
+char *
+caja_get_filesystem_id_by_location (GFile *location, gboolean follow)
+{
+    GFileInfo *info;
+    GFileQueryInfoFlags flags;
+    char *filesystem_id = NULL;
+
+    if (follow) {
+        flags = G_FILE_QUERY_INFO_NONE;
+    } else {
+        flags = G_FILE_QUERY_INFO_NOFOLLOW_SYMLINKS;
+    }
+
+    info = g_file_query_info (location, G_FILE_ATTRIBUTE_ID_FILESYSTEM, flags, NULL, NULL);
+    if (info) {
+        if (g_file_info_has_attribute (info, G_FILE_ATTRIBUTE_ID_FILESYSTEM)) {
+            filesystem_id = g_strdup (
+                g_file_info_get_attribute_string (info, G_FILE_ATTRIBUTE_ID_FILESYSTEM));
+        }
+        g_object_unref (info);
+    }
+    return filesystem_id;
+}
+
+char *
+caja_get_filesystem_id_by_uri (const char *uri, gboolean follow)
+{
+    GFile *location;
+    char *filesystem_id;
+
+    location = g_file_new_for_uri (uri);
+    filesystem_id = caja_get_filesystem_id_by_location (location, follow);
+    g_object_unref (location);
+    return filesystem_id;
+}
+
 #if !defined (CAJA_OMIT_SELF_CHECK)
 
 void
diff --git a/libcaja-private/caja-file-utilities.h b/libcaja-private/caja-file-utilities.h
index 1a65fcb9..c29b527a 100644
--- a/libcaja-private/caja-file-utilities.h
+++ b/libcaja-private/caja-file-utilities.h
@@ -94,5 +94,7 @@ GHashTable * caja_trashed_files_get_original_directories (GList *files,
         GList **unhandled_files);
 void caja_restore_files_from_trash (GList *files,
                                     GtkWindow *parent_window);
+char * caja_get_filesystem_id_by_location (GFile *location, gboolean follow);
+char * caja_get_filesystem_id_by_uri (const char *uri, gboolean follow);
 
 #endif /* CAJA_FILE_UTILITIES_H */
-- 
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