[FL-3883] Remove internal storage folder if corresponding flag set (#3824)

* Remove the .int directory when the flag is set
* Improve error handling and variable naming
* Cleanup the code
* Fix updater build

Co-authored-by: あく <alleteam@gmail.com>

applications/services/storage/storage.c

@@ -102,11 +102,6 @@ int32_t storage_srv(void* p) {
     Storage* app = storage_app_alloc();
     furi_record_create(RECORD_STORAGE, app);
 
-    if(furi_hal_rtc_is_flag_set(FuriHalRtcFlagStorageFormatInternal)) {
-        FURI_LOG_W(TAG, "Format Internal not supported, clearing flag");
-        furi_hal_rtc_reset_flag(FuriHalRtcFlagStorageFormatInternal);
-    }
-
     StorageMessage message;
     while(1) {
         if(furi_message_queue_get(app->message_queue, &message, STORAGE_TICK) == FuriStatusOk) {

applications/services/storage/storage_internal_dirname_i.h

@@ -0,0 +1,3 @@
+#pragma once
+
+#define STORAGE_INTERNAL_DIR_NAME ".int"

applications/services/storage/storage_processing.c

@@ -1,7 +1,9 @@
-#include "storage_processing.h"
 #include <m-list.h>
 #include <m-dict.h>
 
+#include "storage_processing.h"
+#include "storage_internal_dirname_i.h"
+
 #define TAG "Storage"
 
 #define STORAGE_PATH_PREFIX_LEN 4u
@@ -555,9 +557,9 @@ void storage_process_alias(
 
     } else if(furi_string_start_with(path, STORAGE_INT_PATH_PREFIX)) {
         furi_string_replace_at(
-            path, 0, strlen(STORAGE_INT_PATH_PREFIX), STORAGE_EXT_PATH_PREFIX "/.int");
+            path, 0, strlen(STORAGE_INT_PATH_PREFIX), EXT_PATH(STORAGE_INTERNAL_DIR_NAME));
 
-        FuriString* int_on_ext_path = furi_string_alloc_set(STORAGE_EXT_PATH_PREFIX "/.int");
+        FuriString* int_on_ext_path = furi_string_alloc_set(EXT_PATH(STORAGE_INTERNAL_DIR_NAME));
         if(storage_process_common_stat(app, int_on_ext_path, NULL) != FSE_OK) {
             storage_process_common_mkdir(app, int_on_ext_path);
         }

applications/services/storage/storages/storage_ext.c

@@ -1,10 +1,13 @@
-#include "fatfs.h"
+#include <fatfs.h>
-#include "../filesystem_api_internal.h"
-#include "storage_ext.h"
 #include <furi_hal.h>
-#include "sd_notify.h"
 #include <furi_hal_sd.h>
 
+#include "sd_notify.h"
+#include "storage_ext.h"
+
+#include "../filesystem_api_internal.h"
+#include "../storage_internal_dirname_i.h"
+
 typedef FIL SDFile;
 typedef DIR SDDir;
 typedef FILINFO SDFileInfo;
@@ -93,6 +96,64 @@ static bool sd_mount_card_internal(StorageData* storage, bool notify) {
     return result;
 }
 
+static bool sd_remove_recursive(const char* path) {
+    SDDir* current_dir = malloc(sizeof(DIR));
+    SDFileInfo* file_info = malloc(sizeof(FILINFO));
+    FuriString* current_path = furi_string_alloc_set(path);
+
+    bool go_deeper = false;
+    SDError status;
+
+    while(true) {
+        status = f_opendir(current_dir, furi_string_get_cstr(current_path));
+        if(status != FR_OK) break;
+
+        while(true) {
+            status = f_readdir(current_dir, file_info);
+            if(status != FR_OK || !strlen(file_info->fname)) break;
+
+            if(file_info->fattrib & AM_DIR) {
+                furi_string_cat_printf(current_path, "/%s", file_info->fname);
+                go_deeper = true;
+                break;
+
+            } else {
+                FuriString* file_path = furi_string_alloc_printf(
+                    "%s/%s", furi_string_get_cstr(current_path), file_info->fname);
+                status = f_unlink(furi_string_get_cstr(file_path));
+                furi_string_free(file_path);
+
+                if(status != FR_OK) break;
+            }
+        }
+
+        status = f_closedir(current_dir);
+        if(status != FR_OK) break;
+
+        if(go_deeper) {
+            go_deeper = false;
+            continue;
+        }
+
+        status = f_unlink(furi_string_get_cstr(current_path));
+        if(status != FR_OK) break;
+
+        if(!furi_string_equal(current_path, path)) {
+            size_t last_char_pos = furi_string_search_rchar(current_path, '/');
+            furi_assert(last_char_pos != FURI_STRING_FAILURE);
+            furi_string_left(current_path, last_char_pos);
+        } else {
+            break;
+        }
+    }
+
+    free(current_dir);
+    free(file_info);
+    furi_string_free(current_path);
+
+    return status == FR_OK;
+}
+
 FS_Error sd_unmount_card(StorageData* storage) {
     SDData* sd_data = storage->data;
     SDError error;
@@ -112,21 +173,32 @@ FS_Error sd_mount_card(StorageData* storage, bool notify) {
 
     if(storage->status != StorageStatusOK) {
         FURI_LOG_E(TAG, "sd init error: %s", storage_data_status_text(storage));
-        if(notify) {
-            NotificationApp* notification = furi_record_open(RECORD_NOTIFICATION);
-            sd_notify_error(notification);
-            furi_record_close(RECORD_NOTIFICATION);
-        }
         error = FSE_INTERNAL;
+
     } else {
         FURI_LOG_I(TAG, "card mounted");
-        if(notify) {
-            NotificationApp* notification = furi_record_open(RECORD_NOTIFICATION);
-            sd_notify_success(notification);
-            furi_record_close(RECORD_NOTIFICATION);
-        }
 
+#ifndef FURI_RAM_EXEC
+        if(furi_hal_rtc_is_flag_set(FuriHalRtcFlagStorageFormatInternal)) {
+            FURI_LOG_I(TAG, "deleting internal storage directory");
+            error = sd_remove_recursive(STORAGE_INTERNAL_DIR_NAME) ? FSE_OK : FSE_INTERNAL;
+        } else {
+            error = FSE_OK;
+        }
+#else
+        UNUSED(sd_remove_recursive);
         error = FSE_OK;
+#endif
+    }
+
+    if(notify) {
+        NotificationApp* notification = furi_record_open(RECORD_NOTIFICATION);
+        if(error != FSE_OK) {
+            sd_notify_error(notification);
+        } else {
+            sd_notify_success(notification);
+        }
+        furi_record_close(RECORD_NOTIFICATION);
     }
 
     return error;
@@ -654,4 +726,8 @@ void storage_ext_init(StorageData* storage) {
 
     // do not notify on first launch, notifications app is waiting for our thread to read settings
     storage_ext_tick_internal(storage, false);
+#ifndef FURI_RAM_EXEC
+    // always reset the flag to prevent accidental wipe on SD card insertion
+    furi_hal_rtc_reset_flag(FuriHalRtcFlagStorageFormatInternal);
+#endif
 }