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#!/bin/sh

. samizdat-paths.sh

initrd=${samizdat_linux_dir}/initrd.img
vmlinuz=${samizdat_linux_dir}/vmlinuz
conf_dir=$samizdat_initramfs_conf_dir
apt_dependencies=$samizdat_initrd_files_dir/initrd-dependencies.txt

find_source_dirs() {
    find "$conf_dir" "$samizdat_initrd_files_dir" "$@"
}

force_rebuild()
{
    touch "$conf_dir"
    return 1
}

rebuild()
{
    [ ! -f "$apt_dependencies" ] ||
        sudo apt-get install -q=10 --no-upgrade -y $(cat "$apt_dependencies")

    set -ex
    cp -f /boot/vmlinuz-"${kernel_version}" "$vmlinuz"
    /usr/sbin/mkinitramfs -d "$conf_dir" -o "$initrd" "${kernel_version}" || force_rebuild
}

[ "$kernel_version" ]

if [ ! -e "$initrd" -o ! -e "$vmlinuz" ]; then
    rebuild
else
    found=$(find_source_dirs -newer "$initrd" -print -quit)
    if [ "$found" ]; then
        echo "initrd.sh: rebuild forced: found modified source: $found"
        rebuild
    fi
fi