tailscale/gokrazy/UTM.md

tsapp on UTM

qemu from homebrew is recommended for tsapp development. See the main README for details.

If you don't want to use qemu, this documents a way to use UTM on macOS for tsapp development. It's not as quick of an edit-run-test iteration cycle, but this is how:

• Create new VM, choose "Emulate" (for now) and not "Virtualize"
• Pick "Linux" as the operating system
• For "Boot ISO Image", select the built tsapp.img
• Architecture: x86_64 (for now; arm64 later)
• System: Standard PC (...) (q35)
• Memory: 1024 MB is fine for testing
• CPUs: Default
• Storage size: 3GB
• Shared Directory: none. Continue.
• Summary: check "Open VM Settings"
• Network: Emulated Network Card: virtio-net-pci
• Display: Emulated Display Card: virtio-vga (not that there's much to see)
• Drives: delete all disks
• Drives: New... Interface VirtIO, Import ... find tsapp.img again. Save.
• Devices: New... Serial. Mode: Psuedo-TTY Device, Target: Automatic Serial Device.

Once created & the img is imported once, UTM converts it to qcow2 format under $HOME/Library/Containers/com.utmapp.UTM/Data/Documents/Tsapp.utm/Data/tsapp.qcow2.

To update it, stop the VM, then:

qemu-img convert -f raw -O qcow2 tsapp.img tsapp.qcow2 && \
  mv tsapp.qcow2 $HOME/Library/Containers/com.utmapp.UTM/Data/Documents/Tsapp.utm/Data/tsapp.qcow2

To attach to its serial:

% /Applications/UTM.app/Contents/MacOS/utmctl list
UUID                                 Status   Name
C0DE927B-F426-4ABA-A6E7-E30AA429371F started  Tsapp

% % /Applications/UTM.app/Contents/MacOS/utmctl attach C0DE927B-F426-4ABA-A6E7-E30AA429371F
WARNING: attach command is not implemented yet!
PTTY: /dev/ttys017

% screen /dev/ttys017

(Then Ctrl-a K to kill screen session)