kanit

Toy init system
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prepare-vm (1019B)

      1 #!/bin/sh
      2 set -eE
      3 
      4 trap 'cleanup' ERR
      5 
      6 # Initializes an Alpine Linux vm for testing
      7 IMAGE_URL="https://dl-cdn.alpinelinux.org/alpine/v3.20/releases/x86_64/alpine-virt-3.20.1-x86_64.iso"
      8 IMAGE=${IMAGE_URL##*/}
      9 
     10 ###
     11 
     12 former_pwd=$(pwd)
     13 cd -P -- "$(dirname "$0")" || return
     14 
     15 download_image() {
     16   echo "downloading alpine image"
     17 
     18   [ ! -f "$IMAGE" ] && curl -o "$IMAGE" $IMAGE_URL
     19   [ ! -f "$IMAGE.sha256" ] && curl -o "$IMAGE.sha256" "$IMAGE_URL.sha256"
     20 
     21   sha256sum -c "$IMAGE.sha256"
     22 }
     23 
     24 create_vm() {
     25   echo "initializing alpine vm"
     26 
     27   [ ! -f "alpine.qcow2" ] && qemu-img create -f qcow2 alpine.qcow2 8G
     28 
     29   mkdir ./tmp.share
     30 
     31   cp ./init ./answers ./tmp.share
     32 
     33   ./controller $IMAGE
     34 
     35   if [ -f "alpine.qcow2" ]; then
     36     echo "generated alpine.qcow2"
     37     mv ./alpine.qcow2 ./tmp.share/initramfs ./tmp.share/vmlinuz-virt "$former_pwd"
     38   fi
     39 }
     40 
     41 cleanup() {
     42   echo "cleaning up"
     43 
     44   rm -fv "$IMAGE" "$IMAGE.sha256" ./alpine.qcow2
     45 
     46   if [ -d ./tmp.share ]; then
     47     rm -rfv ./tmp.share
     48   fi
     49 }
     50 
     51 download_image
     52 create_vm
     53 cleanup