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#!/bin/bash |
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# Creates a bootable ISO from CoreOS' PXE images. |
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# Also adds a run script to the OEM partition and converts the ISO so it can boot from USB media. |
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# Based heavily off https://github.com/nyarla/coreos-live-iso - Thanks Naoki! |
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set -e |
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# Default configurations |
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SYSLINUX_VERSION="6.02" |
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COREOS_VERSION="master" |
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BOOT_ENV="bios" |
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SSH_PUBKEY_PATH=~/.ssh/id_rsa.pub |
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# Initialze variables |
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SYSLINUX_BASE_URL="https://www.kernel.org/pub/linux/utils/boot/syslinux" |
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SYSLINUX_BASENAME="syslinux-$SYSLINUX_VERSION" |
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SYSLINUX_URL="${SYSLINUX_BASE_URL}/${SYSLINUX_BASENAME}.tar.gz" |
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COREOS_BASE_URL="http://storage.core-os.net/coreos/amd64-generic" |
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COREOS_KERN_BASENAME="coreos_production_pxe.vmlinuz" |
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COREOS_INITRD_BASENAME="coreos_production_pxe_image.cpio.gz" |
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COREOS_KERN_URL="${COREOS_BASE_URL}/${COREOS_VERSION}/${COREOS_KERN_BASENAME}" |
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COREOS_INITRD_URL="${COREOS_BASE_URL}/${COREOS_VERSION}/${COREOS_INITRD_BASENAME}" |
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SSH_PUBKEY=`cat ${SSH_PUBKEY_PATH}` |
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bindir=`cd $(dirname $0) && pwd` |
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workdir=$bindir/work |
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echo "-----> Initialize working directory" |
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if [ ! -d $workdir ];then |
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mkdir -p $workdir |
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fi; |
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cd $workdir |
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mkdir -p iso/coreos |
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mkdir -p iso/syslinux |
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mkdir -p iso/isolinux |
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echo "-----> Download CoreOS's kernel" |
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if [ ! -e iso/coreos/vmlinuz ]; then |
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curl -o iso/coreos/vmlinuz $COREOS_KERN_URL |
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fi |
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echo "-----> Download CoreOS's initrd" |
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if [ ! -e iso/coreos/cpio.gz ]; then |
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curl -o iso/coreos/cpio.gz $COREOS_INITRD_URL |
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fi |
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cd iso/coreos |
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mkdir -p usr/share/oem |
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cat<<EOF > usr/share/oem/run |
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#!/bin/sh |
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# Place your OEM run commands here... |
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EOF |
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chmod +x usr/share/oem/run |
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gzip -d cpio.gz |
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find usr | cpio -o -A -H newc -O cpio |
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gzip cpio |
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rm -rf usr/share/oem |
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cd $workdir |
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echo "-----> Download syslinux and copy to iso directory" |
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if [ ! -e ${SYSLINUX_BASENAME} ]; then |
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curl -O $SYSLINUX_URL |
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fi |
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tar zxf ${SYSLINUX_BASENAME}.tar.gz |
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cp ${SYSLINUX_BASENAME}/${BOOT_ENV}/com32/chain/chain.c32 iso/syslinux/ |
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cp ${SYSLINUX_BASENAME}/${BOOT_ENV}/com32/lib/libcom32.c32 iso/syslinux/ |
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cp ${SYSLINUX_BASENAME}/${BOOT_ENV}/com32/libutil/libutil.c32 iso/syslinux/ |
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cp ${SYSLINUX_BASENAME}/${BOOT_ENV}/memdisk/memdisk iso/syslinux/ |
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cp ${SYSLINUX_BASENAME}/${BOOT_ENV}/core/isolinux.bin iso/isolinux/ |
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cp ${SYSLINUX_BASENAME}/${BOOT_ENV}/com32/elflink/ldlinux/ldlinux.c32 iso/isolinux/ |
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echo "-----> Make isolinux.cfg file" |
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cat<<EOF > iso/isolinux/isolinux.cfg |
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INCLUDE /syslinux/syslinux.cfg |
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EOF |
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echo "-----> Make syslinux.cfg file" |
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cat<<EOF > iso/syslinux/syslinux.cfg |
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default coreos |
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prompt 1 |
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timeout 15 |
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label coreos |
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kernel /coreos/vmlinuz |
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append initrd=/coreos/cpio.gz root=squashfs: state=tmpfs: sshkey="${SSH_PUBKEY}" |
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EOF |
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echo "-----> Make ISO file" |
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cd iso |
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mkisofs -v -l -r -J -o ${bindir}/CoreOS.${COREOS_VERSION}.iso -b isolinux/isolinux.bin -c isolinux/boot.cat -no-emul-boot -boot-load-size 4 -boot-info-table . |
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${workdir}/${SYSLINUX_BASENAME}/bios/utils/isohybrid ${bindir}/CoreOS.${COREOS_VERSION}.iso |
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echo "-----> Cleanup" |
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cd $bindir |
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rm -rf $workdir |
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echo "-----> Finished" |
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geekle created this gist