ignition-apply-kargs.sh

#!/bin/bash
set -euo pipefail

cmdline=( $(</proc/cmdline) )

# finds ostree= inside /proc/cmdline
cmdline_arg_ostree() {
    name="ostree" value=""
    for arg in "${cmdline[@]}"; do
        if [[ "${arg%%=*}" == "${name}" ]]; then
            value="${arg#*=}"
            break
        fi
    done
    echo "${value}"
}

# finds name value pair inside /proc/cmdline
cmdline_arg() {
    local name="$1" value="$2"
    for arg in "${cmdline[@]}"; do
        if [[ "${arg%%=*}" == "${name}" ]]; then
            value="${arg#*=}"
        fi
    done
    echo "${value}"
}

# copied from ignition-generator for testing
cmdline_bool() {
    local value=$(cmdline_arg "$@")
    case "$value" in
        ""|0|no|off) return 1;;
        *) return 0;;
    esac
}


# Checks if kernel argument directory exists,
# then redeploy and reboot the system if it exists
reboot_if_kargs_dir_exists() {
    local REFSPEC=( $(ostree refs --repo /sysroot/ostree/repo) )

    if [ -d /sysroot/etc/ostree/kargs.d ]; then
        ostree admin deploy REFSPEC
        exec systemctl reboot
    fi
}

if $(cmdline_bool 'ignition.firstboot' 0); then
    reboot_if_kargs_dir_exists
fi