Monorepo for Aesthetic.Computer
aesthetic.computer
feat: universal boot — one USB image works on both Macs and ThinkPads
Oven build now produces vmlinuz-slim (no embedded initramfs) + separate
initramfs.cpio.gz alongside the full vmlinuz. Flash script auto-detects:
if slim kernel exists, uses splash → systemd-boot → slim kernel chain
(works on Mac EFI). Otherwise falls back to chainloader (ThinkPad).
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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+1
fedac/native/Dockerfile.flash-helper
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fedac/native/Dockerfile.flash-helper
···
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COPY fedac/native/scripts/media-layout.sh /usr/local/lib/ac-media-layout.sh
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COPY fedac/native/scripts/flash-helper-runner.sh /usr/local/bin/ac-os-flash-helper
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COPY fedac/native/boot/systemd-bootx64.efi /usr/local/lib/systemd-bootx64.efi
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COPY fedac/native/bootloader/splash.efi /usr/local/lib/splash.efi
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RUN chmod +x /usr/local/bin/ac-os-flash-helper
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fedac/native/docker-build.sh
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fedac/native/docker-build.sh
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SHA=$(sha256sum "$BUILD/vmlinuz" | awk '{print $1}')
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# ══════════════════════════════════════════════
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# Step 4b: Build slim kernel (no embedded initramfs) for Mac EFI boot
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# ══════════════════════════════════════════════
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log "Step 4b: Building slim kernel for Mac..."
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sed -i 's|^CONFIG_INITRAMFS_SOURCE=.*|CONFIG_INITRAMFS_SOURCE=""|' .config
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rm -f usr/initramfs_data.o usr/.initramfs_data.o.cmd
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if run_make_with_heartbeat "$BUILD/kernel-slim.log" make -j"${KERNEL_JOBS}" bzImage; then
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cp arch/x86/boot/bzImage "$BUILD/vmlinuz-slim"
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cp arch/x86/boot/bzImage "$OUT/vmlinuz-slim" 2>/dev/null || true
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SLIM_SIZE=$(stat -c%s "$BUILD/vmlinuz-slim")
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log " Slim kernel: $((SLIM_SIZE / 1048576))MB"
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else
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err "Slim kernel build failed (non-fatal)"
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fi
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# Restore config for any subsequent builds
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sed -i 's|^CONFIG_INITRAMFS_SOURCE=.*|CONFIG_INITRAMFS_SOURCE="initramfs.cpio.lz4"|' .config
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# Export initramfs as gzip (for systemd-boot on Mac)
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log " Packing initramfs.cpio.gz..."
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lz4 -d "$BUILD/initramfs.cpio.lz4" -c 2>/dev/null | gzip -c > "$BUILD/initramfs.cpio.gz"
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cp "$BUILD/initramfs.cpio.gz" "$OUT/initramfs.cpio.gz" 2>/dev/null || true
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log " initramfs.cpio.gz: $(($(stat -c%s "$BUILD/initramfs.cpio.gz") / 1048576))MB"
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# ══════════════════════════════════════════════
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# Step 5: Generate UEFI-bootable ISO
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# ══════════════════════════════════════════════
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log "Step 5: Building ISO..."
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fedac/native/scripts/flash-helper-runner.sh
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fedac/native/scripts/flash-helper-runner.sh
···
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cp "${STAGED_ROOT}/EFI/BOOT/KERNEL.EFI" "${mountpoint}/EFI/BOOT/BOOTX64.EFI"
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;;
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systemd-boot)
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# Use systemd-boot as BOOTX64.EFI with SLIM kernel + separate initramfs.
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# Mac EFI can't load a 270MB kernel. The slim kernel (~15MB) has no
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# embedded initramfs. systemd-boot loads both via linux + initrd.
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# Universal boot: splash.efi → systemd-boot → slim kernel + initramfs.
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# splash.efi shows "Aesthetic.Computer" on black, chains to LOADER.EFI.
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# Works on both Macs (can't load 270MB) and ThinkPads.
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local sdboot="/usr/local/lib/systemd-bootx64.efi"
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[ ! -f "${sdboot}" ] && sdboot="/repo/fedac/native/boot/systemd-bootx64.efi"
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[ ! -f "${sdboot}" ] && sdboot="/workspaces/aesthetic-computer/fedac/native/boot/systemd-bootx64.efi"
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cp "${sdboot}" "${mountpoint}/EFI/BOOT/BOOTX64.EFI"
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# splash.efi as BOOTX64.EFI (shows splash, chains to LOADER.EFI)
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cp "${STAGED_ROOT}/EFI/BOOT/BOOTX64.EFI" "${mountpoint}/EFI/BOOT/BOOTX64.EFI"
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# systemd-boot as LOADER.EFI (loads slim kernel + initramfs)
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cp "${sdboot}" "${mountpoint}/EFI/BOOT/LOADER.EFI"
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# Use slim kernel if available, fall back to full kernel
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if [ -f "${STAGED_ROOT}/EFI/BOOT/KERNEL-SLIM.EFI" ]; then
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cp "${STAGED_ROOT}/EFI/BOOT/KERNEL-SLIM.EFI" "${mountpoint}/EFI/BOOT/KERNEL.EFI"
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else
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cp "${STAGED_ROOT}/EFI/BOOT/KERNEL.EFI" "${mountpoint}/EFI/BOOT/KERNEL.EFI"
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fi
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# Separate initramfs for systemd-boot to load
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if [ -f "${STAGED_ROOT}/initramfs.cpio.lz4" ]; then
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# Separate initramfs for systemd-boot to load (prefer gzip, fall back to lz4)
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if [ -f "${STAGED_ROOT}/initramfs.cpio.gz" ]; then
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cp "${STAGED_ROOT}/initramfs.cpio.gz" "${mountpoint}/initramfs.cpio.gz"
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elif [ -f "${STAGED_ROOT}/initramfs.cpio.lz4" ]; then
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cp "${STAGED_ROOT}/initramfs.cpio.lz4" "${mountpoint}/initramfs.cpio.lz4"
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fi
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# systemd-boot loader config
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mkdir -p "${mountpoint}/loader/entries"
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printf 'default ac-native.conf\ntimeout 0\n' > "${mountpoint}/loader/loader.conf"
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cat > "${mountpoint}/loader/entries/ac-native.conf" << 'SDBOOT_EOF'
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local initrd_file="initramfs.cpio.gz"
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[ ! -f "${mountpoint}/initramfs.cpio.gz" ] && initrd_file="initramfs.cpio.lz4"
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cat > "${mountpoint}/loader/entries/ac-native.conf" << SDBOOT_EOF
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title AC Native OS
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linux /EFI/BOOT/KERNEL.EFI
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initrd /initramfs.cpio.lz4
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initrd /${initrd_file}
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options console=tty0 quiet loglevel=3 vt.global_cursor_default=0 init=/init efi=noruntime
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SDBOOT_EOF
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;;
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# Partition 1 (ACBOOT): config + kernel as KERNEL.EFI (for AC initramfs to find)
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copy_boot_tree_to_vfat "${MAIN_PART}" /mnt/ac-main yes kernel-only
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# Partition 2 (ACEFI): systemd-boot (134KB) + KERNEL.EFI (270MB)
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# Mac EFI firmware can't LoadImage a 270MB PE/COFF. splash.efi also
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# uses LoadImage internally and fails the same way. systemd-boot uses
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# the EFI handover protocol to load the kernel directly into memory,
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# bypassing LoadImage entirely.
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copy_boot_tree_to_vfat "${EFI_PART}" /mnt/ac-efi no systemd-boot
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# Partition 2 (ACEFI): universal boot — splash → systemd-boot → slim kernel + initramfs
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# Works on both Macs (can't load 270MB EFI app) and ThinkPads.
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# If slim kernel isn't available, falls back to chainloader mode.
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if [ -f "${STAGED_ROOT}/EFI/BOOT/KERNEL-SLIM.EFI" ] && [ -f "${STAGED_ROOT}/initramfs.cpio.gz" ]; then
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log "Using universal boot: splash → systemd-boot → slim kernel + initramfs"
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copy_boot_tree_to_vfat "${EFI_PART}" /mnt/ac-efi no systemd-boot
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else
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log "No slim kernel — using chainloader mode (ThinkPad only)"
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copy_boot_tree_to_vfat "${EFI_PART}" /mnt/ac-efi no chainloader
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fi
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populate_mac_partition "${MAC_PART}" /mnt/ac-mac
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sync
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fedac/native/scripts/media-layout.sh
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fedac/native/scripts/media-layout.sh
···
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cp "${kernel_path}" "${stage_root}/EFI/BOOT/KERNEL.EFI"
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cp "${config_path}" "${stage_root}/config.json"
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# Stage slim kernel + initramfs for Mac boot (systemd-boot mode)
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# Stage slim kernel + initramfs for universal boot (systemd-boot mode)
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local kernel_dir
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kernel_dir="$(dirname "${kernel_path}")"
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local slim="${kernel_dir}/vmlinuz-slim"
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local initramfs="${kernel_dir}/initramfs.cpio.lz4"
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if [ -f "${slim}" ]; then
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cp "${slim}" "${stage_root}/EFI/BOOT/KERNEL-SLIM.EFI"
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fi
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if [ -f "${initramfs}" ]; then
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cp "${initramfs}" "${stage_root}/initramfs.cpio.lz4"
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# Prefer gzip initramfs (universal), fall back to lz4
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local initramfs_gz="${kernel_dir}/initramfs.cpio.gz"
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local initramfs_lz4="${kernel_dir}/initramfs.cpio.lz4"
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if [ -f "${initramfs_gz}" ]; then
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cp "${initramfs_gz}" "${stage_root}/initramfs.cpio.gz"
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elif [ -f "${initramfs_lz4}" ]; then
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cp "${initramfs_lz4}" "${stage_root}/initramfs.cpio.lz4"
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fi
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}
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