66 lines
3.0 KiB
Markdown
66 lines
3.0 KiB
Markdown
# Minimal Linux Script
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One script which generates fully functional live Linux ISO image with minimal effort. This is based on the first published version of [Minimal Linux Live](http://github.com/ivandavidov/minimal). All comments and empty lines have been removed and the original script code has been slightly altered to reduce the overall script length.
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The script below uses **Linux kernel 3.15.6** and **BusyBox 1.22.1**. The source bundles are downloaded and compiled automatically. If you are using [Ubuntu](http://ubuntu.com) or [Linux Mint](http://linuxmint.com), you should be able to resolve all build dependencies by executing the following command:
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sudo apt-get install wget bc build-essential gawk syslinux genisoimage
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After that simply run the below script. It doesn't require root privileges. In the end you should have a bootable ISO image named `minimal_linux_live.iso` in the same directory where you executed the script.
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rm -rf work
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mkdir work
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cd work
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rm -f linux-3.15.6.tar.xz
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wget http://kernel.org/pub/linux/kernel/v3.x/linux-3.15.6.tar.xz
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rm -rf kernel
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mkdir kernel
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tar -xvf linux-3.15.6.tar.xz -C kernel
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cd kernel/linux-3.15.6
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make clean defconfig vmlinux
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cd ../..
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rm -f busybox-1.22.1.tar.bz2
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wget http://busybox.net/downloads/busybox-1.22.1.tar.bz2
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rm -rf busybox
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mkdir busybox
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tar -xvf busybox-1.22.1.tar.bz2 -C busybox
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cd busybox/busybox-1.22.1
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make clean defconfig
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sed -i "s/.*CONFIG_STATIC.*/CONFIG_STATIC=y/" .config
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make busybox install
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rm -rf ../../rootfs
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cp -R _install ../../rootfs
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cd ../../rootfs
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rm -f linuxrc
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mkdir dev etc proc sys tmp
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cd etc
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echo > welcome.txt
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echo ' #####################################' >> welcome.txt
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echo ' # #' >> welcome.txt
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echo ' # Welcome to "Minimal Linux Live" #' >> welcome.txt
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echo ' # #' >> welcome.txt
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echo ' #####################################' >> welcome.txt
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echo >> welcome.txt
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cd ..
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echo '#!/bin/sh' > init
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echo 'dmesg -n 1' >> init
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echo 'mount -t devtmpfs none /dev' >> init
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echo 'mount -t proc none /proc' >> init
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echo 'mount -t sysfs none /sys' >> init
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echo 'cat /etc/welcome.txt' >> init
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echo 'while true' >> init
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echo 'do' >> init
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echo ' setsid cttyhack /bin/sh' >> init
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echo 'done' >> init
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echo >> init
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chmod +x init
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rm -f ../rootfs.cpio.gz
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cd ../rootfs
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find . | cpio -H newc -o | gzip > ../rootfs.cpio.gz
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rm -f ../../minimal_linux_live.iso
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cd ../kernel/linux-3.15.6
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make isoimage FDINITRD=../../rootfs.cpio.gz
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cp arch/x86/boot/image.iso ../../../minimal_linux_live.iso
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cd ../../..
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Note that this produces very small live Linux OS with working shell and no proper network support. The network support has been implemented properly in the [Minimal Linux Live](http://github.com/ivandavidov/minimal) project which is extensively documented and more feature rich, yet still produces very small live Linux ISO image.
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