forked from ungleich-public/cdist
can generate initramfs from busybox
Signed-off-by: Nico Schottelius <nico@wurzel.schottelius.org>
This commit is contained in:
parent
f51a444012
commit
7ba6c0a44a
10 changed files with 119 additions and 29 deletions
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@ -1,29 +0,0 @@
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#!/bin/sh
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# FIXME: Write cdist type / explorer that finds
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# package for a file, distro independent
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if [ "$#" -ne 1 ]; then
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echo "$0 dir-out"
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exit 1
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fi
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dir=$1; shift
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boot=$dir/boot
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mkdir -p "$boot"
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cp /boot/vmlinuz-linux \
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/boot/initramfs-linux-fallback.img \
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/usr/lib/syslinux/bios/isolinux.bin \
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"$boot"
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cp /usr/lib/syslinux/bios/ldlinux.c32 \
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"$dir"
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cat > "$dir/isolinux.cfg" << eof
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default preos
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label preos
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title cdist PreOS
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linux /boot/vmlinuz-linux
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initrd /boot/initramfs-linux-fallback.img
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eof
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24
hacking/v3-busybox/add_kernel_isolinux.sh
Executable file
24
hacking/v3-busybox/add_kernel_isolinux.sh
Executable file
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#!/bin/sh
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# FIXME: distro specific kernel location
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if [ "$#" -ne 1 ]; then
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echo "$0 dir-out"
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exit 1
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fi
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dir=$1; shift
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boot=$dir/boot
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mkdir -p "$boot"
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cp /boot/vmlinuz-linux "$boot/linux"
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cp /usr/lib/syslinux/bios/isolinux.bin "$boot"
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cp /usr/lib/syslinux/bios/ldlinux.c32 "$dir"
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cat > "$dir/isolinux.cfg" << eof
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default preos
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label preos
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title cdist PreOS
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linux /boot/linux
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initrd /boot/initramfs
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eof
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8
hacking/v3-busybox/all.sh
Executable file
8
hacking/v3-busybox/all.sh
Executable file
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#!/bin/sh
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rm -rf preos
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mkdir -p preos/boot
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./generate.sh > preos/boot/initramfs
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./add_kernel_isolinux.sh preos
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27
hacking/v3-busybox/generate.sh
Executable file
27
hacking/v3-busybox/generate.sh
Executable file
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#!/bin/sh
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set -ex
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initramfs_dir=$(mktemp -d /tmp/cdist-preos.XXXXXXX)
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# initramfs_dir=$1
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for dir in bin sbin etc proc sys newroot; do
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mkdir -p ${initramfs_dir}/$dir
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done
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touch ${initramfs_dir}/etc/mdev.conf
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cp init "${initramfs_dir}/init"
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cp $(which busybox) "${initramfs_dir}/bin"
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ln -fs busybox "${initramfs_dir}/bin/sh"
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cd "${initramfs_dir}"
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find . | cpio -H newc -o | gzip
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exit 0
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# TODO:
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# - Kernel modules
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# - ssh
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# - various mkfs
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# - libs
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60
hacking/v3-busybox/init
Normal file
60
hacking/v3-busybox/init
Normal file
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#!/bin/sh
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#Mount things needed by this script
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mount -t proc proc /proc
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mount -t sysfs sysfs /sys
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#Disable kernel messages from popping onto the screen
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echo 0 > /proc/sys/kernel/printk
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#Create all the symlinks to /bin/busybox
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busybox --install -s
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#Create device nodes
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mknod /dev/null c 1 3
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mknod /dev/tty c 5 0
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mdev -s
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#Function for parsing command line options with "=" in them
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# get_opt("init=/sbin/init") will return "/sbin/init"
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get_opt() {
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echo "$@" | cut -d "=" -f 2
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}
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#Defaults
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init="/sbin/init"
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root="/dev/hda1"
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#Process command line options
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for i in $(cat /proc/cmdline); do
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case $i in
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root\=*)
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root=$(get_opt $i)
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;;
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init\=*)
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init=$(get_opt $i)
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;;
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esac
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done
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exec sh
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# Skipping the rest
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#Mount the root device
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mount "${root}" /newroot
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#Check if $init exists and is executable
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if [[ -x "/newroot/${init}" ]] ; then
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#Unmount all other mounts so that the ram used by
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#the initramfs can be cleared after switch_root
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umount /sys /proc
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#Switch to the new root and execute init
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exec switch_root /newroot "${init}"
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fi
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#This will only be run if the exec above failed
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echo "Failed to switch_root, dropping to a shell"
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exec sh
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