make_gdb_vm_image.sh

   1 #!/bin/bash
   2 # doesn't actually fully work yet...
   3 set -e
   4 if [[ "$(id -u)" != 0 ]]; then
   5     exec sudo bash "$0" "$@"
   6 fi
   7 build_dir="$(mktemp -d)"
   8 iso_dir="$build_dir/iso"
   9 mounts=()
  10 function at_exit() {
  11     set +e
  12     for i in "${mounts[@]}"; do
  13         umount "$i"
  14     done
  15     rm -rf --one-file-system "$build_dir"
  16 }
  17 trap at_exit EXIT
  18 mmdebstrap -v --variant=apt --include=grub-ieee1275-bin,xorriso,gdbserver,linux-image-powerpc64le --architecture=ppc64el bullseye "$build_dir"
  19 echo "gdb-vm-build" > "$build_dir"/etc/debian_chroot
  20 if [[ "$(arch)" != "ppc64le" ]]; then
  21     cp /usr/bin/qemu-ppc64le-static "$build_dir"/usr/bin/qemu-ppc64le-static
  22 fi
  23 cp /etc/resolv.conf "$build_dir"/etc/resolv.conf
  24 mount --bind /dev "$build_dir"/dev
  25 mounts=("$build_dir"/dev "${mounts[@]}")
  26 mount --bind /dev/pts "$build_dir"/dev/pts
  27 mounts=("$build_dir"/dev/pts "${mounts[@]}")
  28 mount --bind /proc "$build_dir"/proc
  29 mounts=("$build_dir"/proc "${mounts[@]}")
  30 mount --bind /sys "$build_dir"/sys
  31 mounts=("$build_dir"/sys "${mounts[@]}")
  32 mkdir "$iso_dir"
  33 cat > "$build_dir"/etc/initramfs-tools/hooks/gdbserver <<'EOF'
  34 #!/bin/sh
  35
  36 PREREQ=""
  37 prereqs()
  38 {
  39     echo "$PREREQ"
  40 }
  41
  42 case $1 in
  43 prereqs)
  44     prereqs
  45     exit 0
  46     ;;
  47 esac
  48
  49 . /usr/share/initramfs-tools/hook-functions
  50
  51 echo copying gdbserver...
  52 copy_exec /usr/bin/gdbserver /usr/bin/gdbserver
  53
  54 exit 0
  55 EOF
  56 chmod +x "$build_dir"/etc/initramfs-tools/hooks/gdbserver
  57 cat > "$build_dir"/etc/initramfs-tools/scripts/init-top/gdbserver <<'EOF'
  58 #!/bin/sh
  59 PREREQ=""
  60
  61 prereqs()
  62 {
  63     echo "$PREREQ"
  64 }
  65
  66 case $1 in
  67 # get pre-requisites
  68 prereqs)
  69     prereqs
  70     exit 0
  71     ;;
  72 esac
  73
  74 # TODO: call gdbserver on serial port instead...then poweroff
  75 sh <>/dev/tty1 >&0 2>&0
  76
  77 exit 0
  78 EOF
  79 chmod +x "$build_dir"/etc/initramfs-tools/scripts/init-top/gdbserver
  80 chroot "$build_dir" update-initramfs -k all -u
  81 cp "$build_dir"/boot/vmlinu?-* "$iso_dir"/vmlinux
  82 cp "$build_dir"/boot/initrd.img-* "$iso_dir"/initrd.gz
  83 mkdir -p "$iso_dir"/boot/grub
  84 cat > "$iso_dir"/boot/grub/grub.cfg <<'EOF'
  85 set timeout=0
  86 set default=0
  87
  88 menuentry "boot" {
  89     insmod gzio
  90     # not a real UUID, just makes initrd work...
  91     set root=(ieee1275/cdrom,apple3)
  92     linux /vmlinux root=UUID=2942fbed-5e30-4bbd-b1ba-5ac1875bc41c debug
  93     initrd /initrd.gz
  94 }
  95 EOF
  96 chroot "$build_dir" grub-mkrescue -o gdb-vm.iso /iso
  97 install -m 644 "$build_dir"/gdb-vm.iso gdb-vm.iso
  98