fs.Mount with fusermount fails on Android (termux)

[mseltahir]

Hello hello,

I'm trying to make gocryptfs work on Android (termux). I can build and execute the binary as usual but when I try to decrypt some folder using:

gocryptfs <encrypted directory> <MOUNTPOINT>

It gives me the following error:

fs.Mount failed: fusermount exited with code 31

I looked up this exit code for fusermount but I couldn't find anything useful. And I tried to understand it further by adding this log statement

tlog.Info.Printf("mountpoint: %v\nrootNode: %v", args.mountpoint, rootNode)

where the code is failing here:

gocryptfs/mount.go

Line 475 in 24b3978

tlog.Fatal.Printf("fs.Mount failed: %s", strings.TrimSpace(err.Error()))

and I got this output

Decrypting master key
mountpoint: /data/data/com.termux/files/home/internal/obsidian
rootNode: i0 ():
fs.Mount failed: fusermount exited with code 31

The mount point seem to be correct, but I don't know if rootNode is, do you have any insight on how I can go around this? My feeling is that it is a problem with the fusermount dependency.

Edit:
I'm using the latest version from master (24b3978)

[rfjakob]

Hi, not sure about android. Maybe look what https://github.com/hardcore-sushi/DroidFS does?

…

On Thu, 6 Apr 2023, 00:18 Mohammed Salah, ***@***.***> wrote: Hello hello, I'm trying to make gocryptfs work on Android (termux). I can build and execute the binary as usual but when I try to decrypt some folder using: gocryptfs <encrypted directory> <MOUNTPOINT> It gives me the following error: fs.Mount failed: fusermount exited with code 31 I looked up this exit code for fusermount but I couldn't find anything useful. And I tried to understand it further by adding this log statement tlog.Info.Printf("mountpoint: %v\nrootNode: %v", args.mountpoint, rootNode) where the code is failing here: https://github.com/rfjakob/gocryptfs/blob/24b3978715186bed3edc2703e81f165a73c0a74a/mount.go#L475 and I got this output Decrypting master key mountpoint: /data/data/com.termux/files/home/internal/obsidian rootNode: i0 (): fs.Mount failed: fusermount exited with code 31 The mount point seem to be correct, but I don't know if rootNode is, do you have any insight on how I can go around this? My feeling is that it is a problem with the fusermount dependency. — Reply to this email directly, view it on GitHub <#727>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AACGA7YMJ2HH5EWECNGLJ7DW7XVSJANCNFSM6AAAAAAWUUMKUY> . You are receiving this because you are subscribed to this thread.Message ID: ***@***.***>

[misterhsp]

fuse only works as root on Android And you must use the -nosyslog option.

...

[mseltahir]

fuse only works as root on Android And you must use the -nosyslog option.

Oh that's unfortunate, do you know of any other alternative to this method?

[okhex]

su -M -c /data/data/com.termux/files/usr/bin/gocryptfs -nosyslog -allow_other /sdcard/Efiles /sdcard/goFs/ this works but there is one problem it appears on each file operation Unknown opcode 2016