OS Error: Permission denied, errno = 13 when reading a File from internal storage

[jnhk]

Hi, I'm trying to read an image file which I uploaded to internal storage through Device File Explorer (on Android emulator) and I ran into a permission error. However, I do not have any problem reading/writing the (image) file I downloaded from the web/localhost.

Note: I am new to mobile development and not sure whether this problem falls under the scope of flutter project, or any other. I suspect that I may be missing a configuration or two on AVD. If this is the case, any pointer to a documentation is really appreciated. Also, if it is more appropriate to post this to SO, I will close this issue and will repost there.

Steps to Reproduce

1. Access the file using path_provider API as suggested in the cookbook :

  Future<String> get _localPath async {
    final directory = await getApplicationDocumentsDirectory();
    return directory.path;
  }

  Future<Image> getImage(int id) async {
    final path = await _localPath;
    File image = File('$path/$id.jpeg'); // 1.jpeg
    return Image.file(image);
  }

  // Widget
  FutureBuilder(
    future: getImage(1),
    builder: (BuildContext context, AsyncSnapshot<Image> snapshot) {
      return snapshot.hasData ? snapshot.data : Container();
    }
  ),

2. Ensure that the file exist and has read permission on Device File Explorer.
   filename: '/data/user/0/<package>/app_flutter/1.jpeg'
   permission: -rw-rw-rw-
   I also modified the user/group to be similar with other files and granted full permissions.

3. This is unrelated, but I also tried adding external storage permissions in AndroidManifest.xml.

Logs

• console

W/1.ui    ( 6196): type=1400 audit(0.0:30): avc: denied { open } for path="/data/data/<package>/app_flutter/1.jpeg" dev="dm-0" ino=16899 scontext=u:r:untrusted_app:s0:c512,c768 tcontext=u:object_r:app_data_file:s0 tclass=file permissive=0
I/flutter ( 6196): ══╡ EXCEPTION CAUGHT BY SERVICES ╞══════════════════════════════════════════════════════════════════
I/flutter ( 6196): The following FileSystemException was thrown resolving an image codec:
I/flutter ( 6196): Cannot open file, path = '/data/user/0/<package>/app_flutter/1.jpeg' (OS Error: Permission denied, errno = 13)
I/flutter ( 6196): When the exception was thrown, this was the stack:
I/flutter ( 6196): #0      _File.open.<anonymous closure> (dart:io/file_impl.dart:368:9)
I/flutter ( 6196): (elided 8 frames from package dart:async)
I/flutter ( 6196): 
I/flutter ( 6196): Path: /data/user/0/<package>/app_flutter/1.jpeg

• flutter analyze

No issues found! (ran in 2.9s)

• flutter doctor

[✓] Flutter (Channel beta, v0.5.1, on Mac OS X 10.13.6 17G65, locale ja-JP)
[✓] Android toolchain - develop for Android devices (Android SDK 27.0.3)
[✓] iOS toolchain - develop for iOS devices (Xcode 9.4.1)
[✓] Android Studio (version 3.1)

[zoechi]

Can you please check what it prints if you change getImage() to

  Future<Image> getImage(int id) async {
    final path = await _localPath;
    File image = File('$path/$id.jpeg'); // 1.jpeg
    print('=== file exists: ${image.existsSync()} ===');
    return Image.file(image);
  }

[jnhk]

It prints === file exists: true === along with the same error as above.

As for length: === file length: 24478 ===

[zoechi]

/cc @cbracken

[jnhk]

Upon closer inspection, this issue is not specific to flutter as I can see similar behavior in android. Hence, closing this issue.

[josvos]

Hi, could someone involved with this issue explain what is/was causing this? I notice that any file of which the inode is not created by the app itself can not be read, although the File.existsSync() and File.lengthSync() methods do work on such files (with the correct results), similar to what is described above.

[Allan-Nava]

Is possible to download a file directly to download path with dio?

final dir = await DownloadsPathProvider.downloadsDirectory;
    try {
      await client.download(url, "${dir.path}/$reportName.pdf",
        onProgress: (rec, total){
          print("Rec: $rec , Total: $total");
        }
      );
    }catch(e){
      print("download $e");
    }

[github-actions]

This thread has been automatically locked since there has not been any recent activity after it was closed. If you are still experiencing a similar issue, please open a new bug, including the output of flutter doctor -v and a minimal reproduction of the issue.