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auto_decompress_kernel for ubuntu20.04 server / rpi usb boot (improved)
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| #!/bin/bash -e | |
| # Put this script in the root of the boot partition (i.e. system-boot) and chmod it with +x | |
| # 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 -f $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 |
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| #!/bin/bash -e | |
| sudo echo 'DPkg::Post-Invoke {"/bin/bash /boot/firmware/auto_decompress_kernel"; };' > /etc/apt/apt.conf.d/999_decompress_rpi_kernel | |
| sudo chmod +x /etc/apt/apt.conf.d/999_decompress_rpi_kernel |
Instructions.
1. Before booting, add the auto compress kernel script to the system-boot partition
2. On first boot, as root, install the auto compress kernel script:
curl https://gist.githubusercontent.com/24HOURSMEDIA/96c472f3301f594b38d78755bef2124e/raw/709eec71bfe69120ec472d92659e81eea420f939/install_999_decompress_rpi_kernel | bash
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The file above should be placed in /etc/apt/apt.conf.d/999_decompress_rpi_kernel