Support for sd card volme create about droidfs HOT 9 CLOSED

AFAIK, a normal app can only write to SD card through the Android ContentProvider API, which is not compatible with DroidFS. Android 11 introduced the MANAGE_EXTERNAL_STORAGE permission which seems to solve the problem. However it's not available for versions below Android 11.

from droidfs.

Couldn't you use the storage access framework to act as a location to external storage to keep your encrypted volume.

from droidfs.

No, unless you find a way to use SAF with paths, without API calls.

from droidfs.

I was wondering you could do it like keepass DX. They used SAF and allowed users to create databases on SD card. Also read and write was possible. Maybe ask the devs there.

from droidfs.

I mean this is not like partitioning your drive as it is creating encrypted files for the new volume you created. So I thought since both use the same methodology, then it was possible.

from droidfs.

KeepassDX and other apps use SAF from the JVM, via API calls. DroidFS needs to access file system from native code but native code can only use SAF through file descriptors. Gocryptfs uses paths. It's not compatible.

See #6 for more details.

from droidfs.

Any app with WRITE_EXTERNAL_STORAGE permission can write to /{path to SD card}/Android/data/{app package name}/. Not sure about OTG, though.

Workaround (tested on Android 10):

• Create directory /storage/1234-5678/Android/data/sushi.hardcore.droidfs/files, replace numbers with UUID.
• Specify this directory or any subdirectory as volume path.
• File picker button inside volume creation and password change activities would not work, so you'll have to type in path manually or through clipboard.

An additional check in function isTreeUriOnPrimaryStorage should be implemented, I guess?

from droidfs.

You're right, but DroidFS can't access arbitrary files on SD card like /{path to SD card}/MyEncryptedVolume. This is why I disabled SD card usage. Maybe I could still allow Android/data/sushi.hardcore.droidfs/files.

from droidfs.

e96d472: I allowed to create volumes under Android/data/sushi.hardcore.droidfs on SD cards. The feature will be available in the next release.

from droidfs.