Automate the Ignition password setting step from https://en.opensuse.org/Portal:MicroOS/Ignition

ignition-password

#!/bin/sh
# Automate the password setting step from
# https://en.opensuse.org/Portal:MicroOS/Ignition
#
# 1. Ask for a password interactively.
# 2. Make an ignition.iso for setting root's password to that.
#    An existing ignition.iso will be overwritten.
#
# Required commands
#   openssl
#   mkisofs
# sudo zypper install mkisofs openssl

set -eu
IGNDIR=$(mktemp --directory ignition.XXXXXX)

mkdir -p "$IGNDIR"/ignition
CONFIG="$IGNDIR"/ignition/config.ign
cat > "$CONFIG" <<EOF
{
  "ignition": { "version": "3.1.0" },
  "passwd": {
    "users": [
      {
        "name": "root",
        "passwordHash": "@PASSWORDHASH@"
      }
    ]
  }
}
EOF

echo >&2 "Choose a password. I will write ignition.iso with that password for root."
PASSWORDHASH="$(openssl passwd -6)"
sed -i -e "s:@PASSWORDHASH@:$PASSWORDHASH:" "$CONFIG"

mkisofs -o ignition.iso -V ignition -quiet "$IGNDIR"

rm -rf "$IGNDIR"
echo >&2 Done.