Permission denied when mounting Android device

[l0b0]

Describe the bug
Following the instructions for MTP with jmtpfs results in a "permission denied" error.

To Reproduce
Steps to reproduce the behavior:

1. Connect a phone via USB.
2. Answer "OK" to the "Using USB to transfer files?" prompt
3. Follow the instructions:

   $ nix-env -f "<nixpkgs>" -iA jmtpfs
   installing 'jmtpfs-0.5'
   these paths will be fetched (0.04 MiB download, 0.14 MiB unpacked):
     /nix/store/akv80ighdp17hivl0rvf6r81c5s8jk61-jmtpfs-0.5
   copying path '/nix/store/akv80ighdp17hivl0rvf6r81c5s8jk61-jmtpfs-0.5' from 'https://cache.nixos.org'...
   building '/nix/store/9vi7gvrygwz972cz2j6fgq0fmqln01xk-user-environment.drv'...
   created 1 symlinks in user environment
   $ mkdir mountpoint
   $ jmtpfs mountpoint
   Device 0 (VID=2e04 and PID=c026) is a Nokia 6.1.
   libusb_open() failed!: Permission denied
   LIBMTP PANIC: Unable to initialize device
   terminate called after throwing an instance of 'MtpErrorCantOpenDevice'
     what():  Can't open device
   Aborted
   

Expected behavior
The device should be mounted.

Metadata

$ nix run nixpkgs.nix-info -c nix-info -m
 - system: `"x86_64-linux"`
 - host os: `Linux 4.19.58, NixOS, 19.03.173085.ecc64b374b2 (Koi)`
 - multi-user?: `yes`
 - sandbox: `yes`
 - version: `nix-env (Nix) 2.2.2`
 - nixpkgs: `/nix/var/nix/profiles/per-user/root/channels/nixos`

[xaverdh]

Putting jmtpfs in environment.systemPackages works for me, but when using nix-shell it fails with the same error.

[l0b0]

@xaverdh Huh - works for me too doing that. Is it expected that this behaviour should be different, or should we keep this open to deal with that?

[xaverdh]

Well its sort of expected, in the sense that some things are known to not work perfectly when using nix-env / nix-shell. But I think the general feeling is that if something can be made to work with nix-shell / nix-env, it should be. So I would keep it open, at least until we know what exactly is causing the difference in behaviour.

[stale]

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[Pamplemousse]

I am facing a similar issue, even using the following configuration:

{
  environment.systemPackages = with pkgs; [
    jmtpfs
  ];

  programs = {
    fuse.userAllowOther = true;
  };

  users.groups.fuse = {};
  users.users.${user} = {
    extraGroups = [ "fuse" "wheel" ];
  };
}