fixed: make export/import work with blob-files again

also add some more logging.

python/src/deltachat/account.py

@@ -189,6 +189,7 @@ class Account(object):
         :param contact: chat_id (int) or contact object.
         :returns: a :class:`deltachat.chatting.Chat` object.
         """
+        assert contact._dc_context == self._dc_context
         contact_id = getattr(contact, "id", contact)
         assert isinstance(contact_id, int)
         chat_id = lib.dc_create_chat_by_contact_id(

python/tests/test_account.py

@@ -207,7 +207,14 @@ class TestOfflineAccount:
         ac1 = acfactory.get_configured_offline_account()
         contact1 = ac1.create_contact("some1@hello.com", name="some1")
         chat = ac1.create_chat_by_contact(contact1)
+        # send a text message
         msg = chat.send_text("msg1")
+        # send a binary file
+        bin = tmpdir.join("some.bin")
+        with bin.open("w") as f:
+            f.write("\00123" * 10000)
+        msg = chat.send_file(bin.strpath)
+
         contact = msg.get_sender_contact()
         assert contact == ac1.get_self_contact()
         assert not backupdir.listdir()
@@ -220,6 +227,11 @@ class TestOfflineAccount:
         assert len(l) == 1
         contact2 = l[0]
         assert contact2.addr == "some1@hello.com"
+        chat2 = ac2.create_chat_by_contact(contact2)
+        messages = chat2.get_messages()
+        assert len(messages) == 2
+        assert messages[0].text == "msg1"
+        assert os.path.exists(messages[1].filename)
 
 
 class TestOnlineAccount:

src/dc_imex.rs

@@ -915,6 +915,7 @@ unsafe fn import_backup(context: &Context, backup_to_import: *const libc::c_char
         backup_to_import,
         context.get_dbfile(),
     );
+
     if 0 != dc_is_configured(context) {
         dc_log_error(
             context,
@@ -942,6 +943,7 @@ unsafe fn import_backup(context: &Context, backup_to_import: *const libc::c_char
                 );
                 sqlite3_step(stmt);
                 total_files_cnt = sqlite3_column_int(stmt, 0i32);
+                info!(context, 0, "***IMPORT-in-progress: total_files_cnt={:?}", total_files_cnt);
                 sqlite3_finalize(stmt);
                 stmt = dc_sqlite3_prepare(
                     context,
@@ -1132,6 +1134,7 @@ unsafe fn export_backup(context: &Context, dir: *const libc::c_char) -> libc::c_
                         let dir_handle = dir_handle.unwrap();
                         total_files_cnt += dir_handle.filter(|r| r.is_ok()).count();
 
+                        info!(context, 0, "EXPORT: total_files_cnt={}", total_files_cnt);
                         if total_files_cnt > 0 {
                             // scan directory, pass 2: copy files
                             let dir_handle = std::fs::read_dir(dir);
@@ -1191,6 +1194,9 @@ unsafe fn export_backup(context: &Context, dir: *const libc::c_char) -> libc::c_
                                         let name = name_f.to_string_lossy();
                                         if name.starts_with("delt-chat") && name.ends_with(".bak") {
                                             // dc_log_info(context, 0, "Backup: Skipping \"%s\".", name);
+                                            continue;
+                                        } else {
+                                            info!(context, 0, "EXPORTing filename={}", name);
                                             free(curr_pathNfilename as *mut libc::c_void);
                                             let name_c = to_cstring(name);
                                             curr_pathNfilename = dc_mprintf(

src/dc_tools.rs

@@ -1258,6 +1258,9 @@ pub unsafe fn dc_write_file(
 ) -> libc::c_int {
     let mut success = 0;
     let pathNfilename_abs = dc_get_abs_path(context, pathNfilename);
+
+    info!(context, 0, "trying to write file {:?}", pathNfilename);
+
     if pathNfilename_abs.is_null() {
         return 0;
     }