/etc/install-vmlinuz-linux.sh: coping/generation vmlinuz and initramfs

install-vmlinuz-linux.sh

#!/bin/bash

set -e

boot_vmlinuz_path='/boot/vmlinuz-linux'
boot_initramfs_path='/boot/initramfs-linux.img'
new_boot_vmlinuz_path="$boot_vmlinuz_path.new"
new_boot_initramfs_path="$boot_initramfs_path.new"
bak_boot_vmlinuz_path="$boot_vmlinuz_path.bak"
bak_boot_initramfs_path="$boot_initramfs_path.bak"

linux_ver="$1"

if [ x"$linux_ver" == "x" ]
then
  auto_linux_ver="$(ls -1 -- '/lib/modules/')"
  auto_vmlinuz_path="/lib/modules/$auto_linux_ver/vmlinuz"

  if [ -f "$auto_vmlinuz_path" ]
  then
    echo "$0: auto linux_ver"

    linux_ver="$auto_linux_ver"
  fi
fi

if [ x"$linux_ver" == "x" ]
then
  echo "$0: missing argument: linux_ver" >&2

  exit 1
fi

vmlinuz_path="/lib/modules/$linux_ver/vmlinuz"

echo "$0: linux_ver: $linux_ver"
echo "$0: vmlinuz_path: $vmlinuz_path"

if [ ! -f "$vmlinuz_path" ]
then
  echo "$0: vmlinuz not found: $vmlinuz_path" >&2

  exit 1
fi

echo "$0: generation new boot files..."

rm -vf -- "$new_boot_vmlinuz_path" "$new_boot_initramfs_path"
cp -v -- "$vmlinuz_path" "$new_boot_vmlinuz_path"
dracut -- "$new_boot_initramfs_path" "$linux_ver"

echo "$0: generation new boot files: DONE!"

echo "$0: replacing boot files..."

if [ -f "$boot_vmlinuz_path" ]
then
  mv -v -- "$boot_vmlinuz_path" "$bak_boot_vmlinuz_path"
fi
if [ -f "$boot_initramfs_path" ]
then
  mv -v -- "$boot_initramfs_path" "$bak_boot_initramfs_path"
fi
mv -v -- "$new_boot_vmlinuz_path" "$boot_vmlinuz_path"
mv -v -- "$new_boot_initramfs_path" "$boot_initramfs_path"
rm -vf -- "$bak_boot_vmlinuz_path" "$bak_boot_initramfs_path"

echo "$0: replacing boot files: DONE!"