#!/bin/sh

. samizdat-paths.sh

initrd=${samizdat_linux_dir}/initrd.img
vmlinuz=${samizdat_linux_dir}/vmlinuz

# version=4.9.0-6-amd64
# version=$(apt-cache policy linux-image-amd64 | sed -ne 's/  Candidate: //p' || uname -r)
kernel_package=linux-image-rt-amd64
kernel_package_version=$(apt-cache policy $kernel_package | sed -ne 's/ *Installed: //p')
real_kernel_package=$(apt-cache show $kernel_package=$kernel_package_version | sed -n 's/^Depends: //p')
version=${real_kernel_package#linux-image-}

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-${version} "$vmlinuz"
    /usr/sbin/mkinitramfs -d "$conf_dir" -o "$initrd" ${version} || force_rebuild
}

if [ ! -e "$initrd" -o ! -e "$vmlinuz" ]; then
    rebuild
elif [ "$(find_source_dirs -newer "$initrd" -print -quit)" ]; then
    rebuild
fi