File build-image.sh of Package kiwi-builder-image

#!/usr/bin/env bash
# Copyright (c) 2025 SUSE LLC
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#

# Set image build defaults, blocksize is an empty string
PROFILE="Base"
LARGEBLOCK=false

# Print usage
usage(){
  cat <<-EOF
  =====================================
  SUSE Linux Micro 6.2 Kiwi SDK Builder
  =====================================

  Usage: ${0} [-p <profile>] [-b]

  Profile Options (-p):
  * Default: RAW Disk Image with default packages (incl. Podman & KVM)
  * Default-SelfInstall: SelfInstall ISO with default packages
  * Base: RAW Disk Image with reduced package set (no KVM)
  * Base-SelfInstall: SelfInstall ISO with reduced packages
  * Base-RT: RAW Disk Image with reduced packages and kernel-rt
  * Base-RT-SelfInstall: SelfInstall ISO with reduced packages and kernel-rt
  * RaspberryPi: RAW Disk Image for Raspberry Pi with default packages (aarch64 only with MBR)
  * RaspberryPi-SelfInstall: SelfInstall ISO for Raspberry Pi with default packages (aarch64 only with MBR)

  4096 Blocksize (-b): If specified, use a 4096 blocksize (rather than 512) when generating the image.

  NOTE: If both options are omitted, the "Base" profile with a standard "512" blocksize is used.
EOF
}

# Grab CLI options and handle
while getopts 'p:bh' OPTION; do
  case "${OPTION}" in
    p)
      PROFILE="${OPTARG}"
      ;;
    b)
      LARGEBLOCK=true
      ;;
    ?)
      usage && exit 2
      ;;
  esac
done

# To avoid wasting time, perform the loop creation test first, and exit with a warning to re-run.
# This only happens when the container hasn't been ran on the host before, and is avoided by mounting /dev/ into the image.
qemu-img create /tmp/output/test.img 1M
if LOOP=$(losetup -f --show /tmp/output/test.img); then
  rm -f /tmp/output/test.img
  losetup -d $LOOP
else
  echo -e "\nERROR: Early loop device test failed, please retry the container run."
  exit 1
fi

# Grab local SLE Micro repos and create a list to use as part of the image build
REPOS=`for i in $(cat /micro-sdk/repos/*.repo | awk '/baseurl/ {split($0,string,"="); print string[2]}'); do echo -n "--add-repo $i "; done`

if $LARGEBLOCK; then
  mv /micro-sdk/defs/SL-Micro.kiwi.4096 /micro-sdk/defs/SL-Micro.kiwi
fi

# Create temporary directory that supports seclabel
dir=$(mktemp -d)
mkdir -p /tmp/output/tmp-dir
mount -t tmpfs $dir /tmp/output/tmp-dir

# Build the image
kiwi-ng --temp-dir /tmp/output/tmp-dir --debug --profile $PROFILE \
    system build --description /micro-sdk/defs --target-dir /tmp/output \
    --ignore-repos-used-for-build $REPOS

# Print output
RESULT=$?
if [ $RESULT -eq 0 ]; then
  echo -e "\n\nINFO: Image build successful, generated images are available in the 'output' directory."
  # The -n flag is being used to avoid the \n at the end of the line
  echo -n "INFO: Generating sha256 checksum file... " && {
  # This returns the iso or raw image from the kiwi.result.json file, preferring iso
  FILE_PATH=$(python3 -c 'import json, sys; data = json.load(sys.stdin); iso = data.get("installation_image", {}).get("filename"); raw = data.get("disk_image", {}).get("filename"); print(iso if iso else raw)' < /tmp/output/kiwi.result.json)
  # Generate the checksum if the file path was successfully extracted
  if [ -n "$FILE_PATH" ]; then
    # The sed trims the full path to just the filename (e.g., "sum filename")
    sha256sum "$FILE_PATH" | sed -E 's/\s+.*\/([^/]+)$/  \1/' > "$FILE_PATH.sha256" && echo "done"
  else
    # Or fail if it is not there
    echo "ERROR: Neither ISO nor RAW file path found in JSON."
  fi
  # Catch-all just in case something fails inside the block
  } || echo "ERROR: Command failed during processing."
else
  echo -e "\n\nERROR: Failed to build the image, please see above logs."
fi