[Taildrive] User server stopped with error "System Administrator" is root

[vinicius507]

What is the issue?

I'm trying to mount a shared directory on my Linux computer using davfs2. It mounts successfully, but the shared folder contents are empty.

# tree /mnt/tailscale/[email protected]/
/mnt/tailscale/[email protected]/
├── minipc
├── mobile
└── pi
    └── obsidian
    
5 directories, 0 files

Checking the tailscaled logs on the server show the following errors:

ago 27 19:41:35 server tailscaled[923]: user server /nix/store/b4g0y694sx9ksgcmfv3ykblwx5by7h9v-tailscale-1.72.0/bin/.tailscaled-wrapped stopped with error "System administrator" is root, will try again in 16.384s
ago 27 19:41:51 server tailscaled[923]: user server /nix/store/b4g0y694sx9ksgcmfv3ykblwx5by7h9v-tailscale-1.72.0/bin/.tailscaled-wrapped stopped with error "System administrator" is root, will try again in 30s
ago 27 19:42:21 server tailscaled[923]: user server /nix/store/b4g0y694sx9ksgcmfv3ykblwx5by7h9v-tailscale-1.72.0/bin/.tailscaled-wrapped stopped with error "System administrator" is root, will try again in 2ms
ago 27 19:42:21 server tailscaled[923]: user server /nix/store/b4g0y694sx9ksgcmfv3ykblwx5by7h9v-tailscale-1.72.0/bin/.tailscaled-wrapped stopped with error "System administrator" is root, will try again in 4ms
ago 27 19:42:21 server tailscaled[923]: user server /nix/store/b4g0y694sx9ksgcmfv3ykblwx5by7h9v-tailscale-1.72.0/bin/.tailscaled-wrapped stopped with error "System administrator" is root, will try again in 8ms
ago 27 19:42:21 server tailscaled[923]: user server /nix/store/b4g0y694sx9ksgcmfv3ykblwx5by7h9v-tailscale-1.72.0/bin/.tailscaled-wrapped stopped with error "System administrator" is root, will try again in 16ms
ago 27 19:42:21 server tailscaled[923]: user server /nix/store/b4g0y694sx9ksgcmfv3ykblwx5by7h9v-tailscale-1.72.0/bin/.tailscaled-wrapped stopped with error "System administrator" is root, will try again in 32ms
ago 27 19:42:21 server tailscaled[923]: [RATELIMIT] format("user server % v stopped with error %v, will try again in %v")
ago 27 19:42:38 server tailscaled[923]: [RATELIMIT] format("user server % v stopped with error %v, will try again in %v") (8 dropped)

The logs can be tracked to: https://github.com/tailscale/tailscale/blob/31cdbd68b12790dfa6c432844a8340563286bc58/drive/driveimpl/remote_impl.go#L321

Steps to reproduce

1. Apply relevant ACL settings

   {
     "nodeAttrs": [
       {
         "target": ["*"],
         "attr": ["drive:access", "drive:share"]
       }
     ],
     "grants": [
       {
         "src": ["autogroup:member"],
         "dst": ["autogroup:self"],
         "app": {
           "tailscale.com/cap/drive": [
             {
               "shares": ["*"],
               "access": "rw"
             }
           ]
         }
       }
     ]
   }
   

2. Share directory as root

   server# tailscale drive share shared-folder /path/to/shared/folder
   

3. Mount shared directory on another machine using davfs2:

   desktop# mount -t davfs http://100.100.100.100:8080 /path/to/mountpoint
   

4. Review the contents of the mountpoint.

Are there any recent changes that introduced the issue?

No response

OS

Linux

OS version

Linux desktop 6.6.45 #1-NixOS SMP PREEMPT_DYNAMIC Sun Aug 11 10:47:28 UTC 2024 x86_64 GNU/Linux

Tailscale version

1.70.0

Other software

No response

Bug report

BUG-a6e3efb5caca7312f773e990d68527d5870e9fb28fc1b009369703b5ad445ec8-20240827223802Z-61ef714733fce97c