unable to mount shared directory, "fs_tag not found"

[simonLeary42]

I tried following the documentation to mount a shared directory:

$ sudo mount -t virtiofs com.apple.virtio-fs.automount ~/Desktop/ubuntu24.04-shared
mount_virtiofs: fs_tag com.apple.virtio-fs.automount not found
mount: /Users/simonleary/Desktop/ubuntu24.04-shared failed with 1

I also tried running the same command in the guest:

admin@ubuntu:~$ sudo mkdir /mnt/shared
admin@ubuntu:~$ sudo mount -t virtiofs com.apple.virtio-fs.automount /mnt/shared
mount: /mnt/shared: wrong fs type, bad option, bad superblock on com.apple.virtio-fs.automount, missing codepage or helper program, or other error.
       dmesg(1) may have more information after failed mount system call.

I am running macos Sequoia 15.7 (24G222) and tart version 2.30.6.

[simonLeary42]

utmapp/UTM#5875

[edigaryev]

How do you run tart run? Specifically, which arguments do you pass to it?

Also, please check out the Accessing mounted directories in macOS guests article in our documentation.

[simonLeary42]

Sorry, I misunderstood the instructions. I skipped the part where it says to use the --dir argument, and thought the command was meant to be run on the hypervisor.

After running tart run --dir=foobar:~/Desktop/ubuntu24.04-shared/ ubuntu24.04, I was able to access /mnt/shared/foobar after running sudo mount -t virtiofs com.apple.virtio-fs.automount /mnt/shared in the guest.

But even as root, I am unable to create a new file in /mnt/shared/foobar/. Is that expected?

[edigaryev]

But even as root, I am unable to create a new file in /mnt/shared/foobar/. Is that expected?

Yes, see https://x.com/enhancedscurry/status/1275454103900971012.

There's no reason to use /mnt on macOS, you can achieve the same effect by mounting to /Volumes/[...] or /Users/$USER/[...]