Make Raspberry Pi OS on macOS without Imager

README.md

$ diskutil list
/dev/disk2 (external, physical):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:     FDisk_partition_scheme                        *30.8 GB    disk2
   1:             Windows_FAT_32 bootfs                  536.9 MB   disk2s1
   2:                      Linux                         30.2 GB    disk2s2

$ diskutil umountDisk disk2
Unmount of all volumes on disk2 was successful

$ which dd
/usr/local/opt/coreutils/libexec/gnubin/dd

$ xz -l 2026-06-18-raspios-trixie-arm64-lite.img.xz
Strms  Blocks   Compressed Uncompressed  Ratio  Check   Filename
    1      15    500.6 MiB  2,840.0 MiB  0.176  CRC64   2026-06-18-raspios-trixie-arm64-lite.img.xz

$ xz -dc 2026-06-18-raspios-trixie-arm64-lite.img.xz | sudo dd of=/dev/disk2 bs=4M status=progress
0+45548 records in
0+45548 records out
2977955840 bytes (3.0 GB, 2.8 GiB) copied, 676.829 s, 4.4 MB/s

$ vim /Volumes/bootfs/user-data

$ diskutil umountDisk disk2
Unmount of all volumes on disk2 was successful

$ diskutil eject disk2
Disk disk2 ejected

user-data

#cloud-config

enable_ssh: true

users:
  - name: pi
    groups: users,adm,dialout,audio,netdev,video,plugdev,cdrom,games,input,gpio,spi,i2c,render,sudo
    shell: /bin/bash
    lock_passwd: false
    plain_text_password: 'raspberrypi'
    ssh_authorized_keys:
      - 'ssh-ed25519 AAAAC3... kev@mac'
      - 'ssh-ed25519 AAAAC3... kev@win'
    sudo: ALL=(ALL) NOPASSWD:ALL