QEMU error "Could not locate UDIF trailer" when using custom boot.dmg (Windows/AMD)

Operating system

Windows 11

Description

I am trying to install macOS 14 (Sonoma) on a Windows 11 machine with an AMD Ryzen processor. I am attempting to use a local installation image by mounting it as /boot.dmg as described in the documentation, but QEMU fails to read the file structure.

The DMG image used in the installation was built from the GitHub Actions run at https://github.com/LSXAxeller/macos-iso-builder/actions/runs/19634577669, using the workflow available at https://github.com/LongQT-sea/macos-iso-builder.

Environment:

• Host OS: Windows 11 (24H2)
• Backend: Docker Desktop (WSL2)
• CPU: AMD Ryzen 5 7600

Docker compose

services:
  macos:
    image: dockurr/macos
    container_name: macos
    environment:
      VERSION: "14"
      RAM_SIZE: "24G"
      CPU_CORES: "1"
      DISK_SIZE: "64G"
    devices:
      - /dev/kvm
      - /dev/net/tun
    cap_add:
      - NET_ADMIN
    ports:
      - 8006:8006
      - 5900:5900/tcp
      - 5900:5900/udp
    volumes:
      - ./macos:/storage
      - "D:\\Programs\\Pro\\ISO\\macOS_Sonoma_14.8.2.dmg:/boot.dmg" 
    restart: always
    stop_grace_period: 2m

Docker log

❯ Starting macOS for Docker v2.29...

❯ For support visit https://github.com/dockur/macos⁠

❯ CPU: AMD Ryzen 5 7600 | RAM: 30/31 GB | DISK: 26 GB (v9fs) | KERNEL: 6.6.87.2-microsoft-standard-WSL2...


❯ Building boot image...

❯ 

❯ Model: iMacPro1,1

❯ Rom: 0016cb3c9171

❯ Serial: C02G5SYYHX87

❯ Board: C02131270CDJG361M

❯ 

❯ Booting macOS using QEMU v10.0.6...

qemu-system-x86_64: -drive file=/storage/14/base.dmg,id=InstallMedia,format=dmg,cache=unsafe,readonly=on,if=none: Could not locate UDIF trailer in dmg file

Screenshots (optional)

No response

Reproduce the report with the supplied Docker Compose configuration, Windows 11/WSL2 environment, and custom image mounted at /boot.dmg. Start by tracing how /boot.dmg becomes /storage/14/base.dmg and compare the QEMU error with the referenced DMG-building workflow; done means identifying whether the image or mount path is unsupported and recording a verified resolution.