279 lines
7.6 KiB
Bash
Executable File
279 lines
7.6 KiB
Bash
Executable File
#!/bin/bash
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set -e # exit on error
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set -o pipefail # exit on pipeline error
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set -u # treat unset variable as error
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#set -x
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SCRIPT_DIR="$(dirname "$(readlink -f "$0")")"
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CMD=(setup_host debootstrap run_chroot build_iso)
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DATE=`TZ="UTC" date +"%y%m%d-%H%M%S"`
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function help() {
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# if $1 is set, use $1 as headline message in help()
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if [ -z ${1+x} ]; then
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echo -e "This script builds bootable ubuntu ISO image"
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echo -e
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else
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echo -e $1
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echo
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fi
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echo -e "Supported commands : ${CMD[*]}"
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echo -e
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echo -e "Syntax: $0 [start_cmd] [-] [end_cmd]"
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echo -e "\trun from start_cmd to end_end"
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echo -e "\tif start_cmd is omitted, start from first command"
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echo -e "\tif end_cmd is omitted, end with last command"
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echo -e "\tenter single cmd to run the specific command"
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echo -e "\tenter '-' as only argument to run all commands"
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echo -e
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exit 0
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}
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function find_index() {
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local ret;
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local i;
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for ((i=0; i<${#CMD[*]}; i++)); do
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if [ "${CMD[i]}" == "$1" ]; then
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index=$i;
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return;
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fi
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done
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help "Command not found : $1"
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}
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function chroot_enter_setup() {
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sudo mount --bind /dev chroot/dev
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sudo mount --bind /run chroot/run
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sudo chroot chroot mount none -t proc /proc
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sudo chroot chroot mount none -t sysfs /sys
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sudo chroot chroot mount none -t devpts /dev/pts
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}
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function chroot_exit_teardown() {
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sudo chroot chroot umount /proc
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sudo chroot chroot umount /sys
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sudo chroot chroot umount /dev/pts
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sudo umount chroot/dev
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sudo umount chroot/run
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}
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function check_host() {
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local os_ver;
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os_ver=`lsb_release -d | grep "Ubuntu 20.04"`
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if [[ $os_ver == "" ]]; then
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echo "WARNING : OS is not Ubuntu 20.04 and is untested"
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fi
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if [ $(id -u) -eq 0 ]; then
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echo "This script should not be run as 'root'"
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exit 1
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fi
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}
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function setup_host() {
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echo "=====> running setup_host ..."
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sudo apt update
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sudo apt install -y binutils debootstrap squashfs-tools xorriso grub-pc-bin grub-efi-amd64-bin mtools
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sudo mkdir -p chroot
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}
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function debootstrap() {
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echo "=====> running debootstrap ... will take a couple of minutes ..."
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sudo debootstrap --arch=amd64 --variant=minbase focal chroot http://us.archive.ubuntu.com/ubuntu/
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}
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function run_chroot() {
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echo "=====> running run_chroot ..."
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chroot_enter_setup
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sudo ln -f $SCRIPT_DIR/chroot_build.sh chroot/root/chroot_build.sh
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sudo cp -f /etc/apt/sources.list chroot/etc/apt/
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sudo chroot chroot /root/chroot_build.sh -
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sudo rm -f chroot/root/chroot_build.sh
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chroot_exit_teardown
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}
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function build_iso() {
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echo "=====> running build_iso ..."
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rm -rf image
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mkdir -p image/{casper,isolinux,install}
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# copy kernel files
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sudo cp chroot/boot/vmlinuz-**-**-generic image/casper/vmlinuz
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sudo cp chroot/boot/initrd.img-**-**-generic image/casper/initrd
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# memtest86
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sudo cp chroot/boot/memtest86+.bin image/install/memtest86+
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wget --progress=dot https://www.memtest86.com/downloads/memtest86-usb.zip -O image/install/memtest86-usb.zip
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unzip -p image/install/memtest86-usb.zip memtest86-usb.img > image/install/memtest86
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rm -f image/install/memtest86-usb.zip
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# grub
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touch image/ubuntu
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cat <<EOF > image/isolinux/grub.cfg
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search --set=root --file /ubuntu
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insmod all_video
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set default="0"
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set timeout=30
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menuentry "Try Ubuntu FS without installing" {
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linux /casper/vmlinuz boot=casper nopersistent toram quiet splash ---
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initrd /casper/initrd
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}
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menuentry "Install Ubuntu FS" {
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linux /casper/vmlinuz boot=casper only-ubiquity quiet splash ---
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initrd /casper/initrd
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}
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menuentry "Check disc for defects" {
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linux /casper/vmlinuz boot=casper integrity-check quiet splash ---
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initrd /casper/initrd
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}
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menuentry "Test memory Memtest86+ (BIOS)" {
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linux16 /install/memtest86+
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}
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menuentry "Test memory Memtest86 (UEFI, long load time)" {
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insmod part_gpt
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insmod search_fs_uuid
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insmod chain
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loopback loop /install/memtest86
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chainloader (loop,gpt1)/efi/boot/BOOTX64.efi
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}
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EOF
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# generate manifest
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sudo chroot chroot dpkg-query -W --showformat='${Package} ${Version}\n' | sudo tee image/casper/filesystem.manifest
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sudo cp -v image/casper/filesystem.manifest image/casper/filesystem.manifest-desktop
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sudo sed -i '/ubiquity/d' image/casper/filesystem.manifest-desktop
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sudo sed -i '/casper/d' image/casper/filesystem.manifest-desktop
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sudo sed -i '/discover/d' image/casper/filesystem.manifest-desktop
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sudo sed -i '/laptop-detect/d' image/casper/filesystem.manifest-desktop
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sudo sed -i '/os-prober/d' image/casper/filesystem.manifest-desktop
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# compress rootfs
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sudo mksquashfs chroot image/casper/filesystem.squashfs
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printf $(sudo du -sx --block-size=1 chroot | cut -f1) > image/casper/filesystem.size
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# create diskdefines
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cat <<EOF > image/README.diskdefines
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#define DISKNAME Ubuntu from scratch
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#define TYPE binary
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#define TYPEbinary 1
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#define ARCH amd64
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#define ARCHamd64 1
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#define DISKNUM 1
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#define DISKNUM1 1
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#define TOTALNUM 0
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#define TOTALNUM0 1
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EOF
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# create iso image
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pushd $SCRIPT_DIR/image
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grub-mkstandalone \
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--format=x86_64-efi \
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--output=isolinux/bootx64.efi \
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--locales="" \
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--fonts="" \
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"boot/grub/grub.cfg=isolinux/grub.cfg"
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(
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cd isolinux && \
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dd if=/dev/zero of=efiboot.img bs=1M count=10 && \
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sudo mkfs.vfat efiboot.img && \
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LC_CTYPE=C mmd -i efiboot.img efi efi/boot && \
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LC_CTYPE=C mcopy -i efiboot.img ./bootx64.efi ::efi/boot/
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)
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grub-mkstandalone \
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--format=i386-pc \
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--output=isolinux/core.img \
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--install-modules="linux16 linux normal iso9660 biosdisk memdisk search tar ls" \
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--modules="linux16 linux normal iso9660 biosdisk search" \
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--locales="" \
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--fonts="" \
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"boot/grub/grub.cfg=isolinux/grub.cfg"
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cat /usr/lib/grub/i386-pc/cdboot.img isolinux/core.img > isolinux/bios.img
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sudo /bin/bash -c "(find . -type f -print0 | xargs -0 md5sum | grep -v -e 'md5sum.txt' -e 'bios.img' -e 'efiboot.img' > md5sum.txt)"
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sudo xorriso \
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-as mkisofs \
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-iso-level 3 \
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-full-iso9660-filenames \
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-volid "Ubuntu from scratch" \
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-eltorito-boot boot/grub/bios.img \
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-no-emul-boot \
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-boot-load-size 4 \
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-boot-info-table \
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--eltorito-catalog boot/grub/boot.cat \
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--grub2-boot-info \
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--grub2-mbr /usr/lib/grub/i386-pc/boot_hybrid.img \
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-eltorito-alt-boot \
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-e EFI/efiboot.img \
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-no-emul-boot \
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-append_partition 2 0xef isolinux/efiboot.img \
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-output "../ubuntu-from-scratch.iso" \
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-m "isolinux/efiboot.img" \
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-m "isolinux/bios.img" \
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-graft-points \
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"/EFI/efiboot.img=isolinux/efiboot.img" \
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"/boot/grub/bios.img=isolinux/bios.img" \
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"."
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popd
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}
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# ============= main ================
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# we always stay in $SCRIPT_DIR
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cd $SCRIPT_DIR
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check_host
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# check number of args
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if [[ $# == 0 || $# > 3 ]]; then help; fi
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# loop through args
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dash_flag=false
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start_index=0
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end_index=${#CMD[*]}
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for ii in "$@";
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do
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if [[ $ii == "-" ]]; then
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dash_flag=true
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continue
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fi
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find_index $ii
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if [[ $dash_flag == false ]]; then
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start_index=$index
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else
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end_index=$(($index+1))
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fi
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done
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if [[ $dash_flag == false ]]; then
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end_index=$(($start_index + 1))
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fi
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#loop through the commands
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for ((ii=$start_index; ii<$end_index; ii++)); do
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${CMD[ii]}
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done
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echo "$0 - Initial build is done!"
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