58 lines
2.8 KiB
Markdown
58 lines
2.8 KiB
Markdown
# Minimal Linux Script
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One script which generates fully functional live Linux ISO image with minimal effort (less than 25 lines of code). This is based on the first published version of [Minimal Linux Live](http://github.com/ivandavidov/minimal) with some minor improvements taken from the next releases. All empty lines and comments have been removed and the script has been modified to reduce the overall length.
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The script below uses **Linux kernel 4.7.2** and **BusyBox 1.24.2**. 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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wget http://kernel.org/pub/linux/kernel/v4.x/linux-4.7.6.tar.xz
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wget http://busybox.net/downloads/busybox-1.24.2.tar.bz2
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wget http://kernel.org/pub/linux/utils/boot/syslinux/syslinux-6.03.tar.xz
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mkdir isoimage
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tar -xvf linux-4.7.6.tar.xz
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tar -xvf busybox-1.24.2.tar.bz2
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tar -xvf syslinux-6.03.tar.xz
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cd busybox-1.24.2
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make distclean 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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cd _install
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rm -f linuxrc
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mkdir dev proc sys
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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 'setsid cttyhack /bin/sh' >> init
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chmod +x init
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find . | cpio -R root:root -H newc -o | gzip > ../../rootfs.cpio.gz
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cd ../../linux-4.7.6
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make mrproper defconfig bzImage
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cp arch/x86/boot/bzImage \
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../isoimage/kernel
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cd ..
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cd isoimage
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cp ../syslinux-6.03/bios/core/isolinux.bin .
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cp ../syslinux-6.03/bios/com32/elflink/ldlinux/ldlinux.c32 .
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cp kernel ./kernel.xz
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cp ../rootfs.cpio.gz ./rootfs.xz
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echo 'default kernel.xz initrd=rootfs.xz' > ./isolinux.cfg
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genisoimage \
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-J \
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-r \
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-o ../minimal_linux_live.iso \
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-b isolinux.bin \
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-c boot.cat \
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-input-charset UTF-8 \
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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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./
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isohybrid -u ../minimal_linux_live.iso 2>/dev/null || true
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cd ..
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Note that this produces very small live Linux OS with working shell only. 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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