2c52814722
The old way of creating the image used to require the user to manually add Syslinux Features like isolinux.bin and ldlinux.c32, which without them, the system wouldn't boot. Now the small instruction guide will move the required files with the Kernel and Rootfs. Also fixed a small user error when generating the Rootfs by changing "find . | cpio -R +0:+0 -H newc -o | gzip > ../../rootfs.cpio.gz" to "find . | cpio -R root:root -H newc -o | gzip > ../../rootfs.cpio.gz"
57 lines
2.8 KiB
Markdown
57 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.xz ./rootfs.xz
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echo 'default kernel.xz initrd=rootfs.xz vga=ask' > ./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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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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