auto_decompress_kernel

#!/bin/bash -e

# https://gist.github.com/superbrothers/23e159f722eebe2627a7d9ea34447457

#Set Variables
BTPATH=/boot/firmware
CKPATH="$BTPATH/vmlinuz"
DKPATH="$BTPATH/vmlinux"

#Check if compression needs to be done.
if [ -e "$BTPATH/check.md5" ]; then
  if md5sum --status --ignore-missing -c "$BTPATH/check.md5"; then
    echo -e "\e[32mFiles have not changed, Decompression not needed\e[0m"
    exit 0
  else
    echo -e "\e[31mHash failed, kernel will be compressed\e[0m"
  fi
fi

#Backup the old decompressed kernel
mv "$DKPATH" "$DKPATH.bak"

if [ ! $? == 0 ]; then
  echo -e "\e[31mDECOMPRESSED KERNEL BACKUP FAILED!\e[0m"
  exit 1
else
  echo -e "\e[32mDecompressed kernel backup was successful\e[0m"
fi

#Decompress the new kernel
echo "Decompressing kernel: "$CKPATH".............."

zcat "$CKPATH" > "$DKPATH"

if [ ! $? == 0 ]; then
  echo -e "\e[31mKERNEL FAILED TO DECOMPRESS!\e[0m"
  exit 1
else
  echo -e "\e[32mKernel Decompressed Succesfully\e[0m"
fi

#Hash the new kernel for checking
md5sum "$CKPATH" "$DKPATH" > "$BTPATH/check.md5"

if [ ! $? == 0 ]; then
  echo -e "\e[31mMD5 GENERATION FAILED!\e[0m"
else
  echo -e "\e[32mMD5 generated Succesfully\e[0m"
fi

#Exit
exit 0