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notes.md

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logging

echo 1 > sm/log.cfg to enable logging to disk, or echo ttyS0,38400 to log to serial port instead (or both with echo 1 ttyS0 using default baud 115200)

  • needs util-linux (so either recommended_apks or fetch_apks util-linux in post-build)
  • note that execution will halt if the logging destination dies
  • log can be replayed with scriptreplay -t runlog.pce -B runlog.txt
  • echo 2 > sm/log.cfg logs to the 2nd partition instead (must be created manually) and is probably much safer since the primary partition can remain read-only
    • to create a 2nd partition, truncate -s +64M asm.usb && echo ',,0c' | sfdisk -qa asm.usb && mkfs.vfat -F16 -nLOGS --offset=$(sfdisk asm.usb -l | awk '{v=$2}END{print v}') asm.usb

serial consoles

the default asm.sh runs ttycons, which looks for a file named tty.cfg and launches interactive shells on all TTYs listed within;

  • echo ttyS0 > sm/tty.cfg to start a shell on ttyS0 (serial port #1) with baud 115200, assuming xterm
  • echo ttyS1 38400 vt102 for something safer

macos

  • install deps: port install bash coreutils gnutar gsed findutils patchutils e2fsprogs + probably some more
  • use iterm2 or something because the default terminal doesn't support [s/[u (save/restore cursor position)

misc

  • need to debug the alpine init? boot it like this to stream a verbose log out through the serial port: lts console=ttyS0,115200,n8 debug_init=1

    • or append the extra args after modloop_verify=no in build.sh
    • qemu: -serial pipe:s as extra arg, and mkfifo s.{in,out}; tee serial.log <s.out& before launch
      • optionally just -serial stdio for interactive without logging

  • rapid prototyping with qemu:

    losetup -f --show ~ed/asm.raw
mount /dev/loop0p1 /mnt/ && tar -czvf /mnt/the.apkovl.tar.gz etc && cp asm-example.sh /mnt/sm/asm.sh && umount /mnt && sync && qemu-system-x86_64 -hda ~ed/asm.raw -m 768 -accel kvm

  • local apk cache; -m http://192.168.122.1:3923/am and...

    echo http://192.168.122.1:3923/am/ > am/mirrors.txt && PYTHONPATH=~/dev/copyparty python3 -um copyparty -v am:am:r:c,on404=~/dev/copyparty/bin/handlers/caching-proxy.py

  • need an alpine base-image for podman? you could make one from scratch:

    podman import https://mirrors.edge.kernel.org/alpine/v3.19/releases/x86_64/alpine-minirootfs-3.19.0-x86_64.tar.gz alpine:latest

  • creating an absolutely minimal image?

    • to exclude the default /etc bloat from a profile, cd into it and mkdir etc; touch etc/.standalone

  • initramfs hacking:

    mkdir x x2
mount -o offset=1048576 asm.usb x
(cd x2 && gzip -d < ../x/boot/initramfs-virt | cpio -idmv)
vim x2/init
(umask 0077; cd x2 && find . | sort | cpio --quiet --renumber-inodes -o -H newc | zstd -19 -T0) > x/boot/initramfs-virt
umount x

  • test boot speed:

    bst() { (t0=$(date +%s.%N); ncat -l -p 4322; t=$(date +%s.%N); echo "v=$t-$t0;scale=3;v/1" | bc) & qemu-system-x86_64 -enable-kvm -vga qxl -drive format=raw,file=asm.usb -m 256; }
./build.sh -i dl/alpine-standard-3.15.0-x86_64.iso -m http://192.168.122.1:3923/am/ -s 0.2 -p min && bst

    asm.sh:

    printf '%s\n' "" 10.0.2.15 24 10.0.2.2 done n | setup-interfaces -r
echo h | nc 192.168.122.1 4322
poweroff