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GNU General Public License
==========================
_Version 2, June 1991_
_Copyright © 1989, 1991 Free Software Foundation, Inc.,_
_51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA_
Everyone is permitted to copy and distribute verbatim copies
of this license document, but changing it is not allowed.
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### TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
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### NO WARRANTY
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### How to Apply These Terms to Your New Programs
If you develop a new program, and you want it to be of the greatest
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Also add information on how to contact you by electronic and paper mail.
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Gnomovision version 69, Copyright (C) year name of author
Gnomovision comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
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Yoyodyne, Inc., hereby disclaims all copyright interest in the program
`Gnomovision' (which makes passes at compilers) written by James Hacker.
<signature of Ty Coon>, 1 April 1989
Ty Coon, President of Vice
This General Public License does not permit incorporating your program into
proprietary programs. If your program is a subroutine library, you may
consider it more useful to permit linking proprietary applications with the
library. If this is what you want to do, use the GNU Lesser General
Public License instead of this License.

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VPS2Arch
========
The fastest way to convert a _VPS_ to [Arch Linux](https://www.archlinux.org/)!
Author
------
[Timothy Redaelli](mailto:tredaelli@archlinux.info)
Description
-----------
This script is used to convert a _VPS_, running another linux distro, to _Arch Linux_.
It should be **only** used if your _VPS_ provider doesn't provide you an _Arch Linux_ image.
Disclaimer
----------
> I'm not responsible for any damage in your system and/or any violation of the agreement between you and your vps provider.
> **Use at your own risk!**
How To
------
Download the script on your _VPS_ and execute it with root privileges
**WARNING** The script will **delete** any data in your _VPS_!
wget http://git.io/vps2arch
chmod +x vps2arch
./vps2arch
How does it work?
-----------------
It's Black Magic.
Just kiddin' 😏, the script itself is very simple.
In a nutshell, it will download the _Arch Linux Bootstrap Image_ and (see the [wiki](https://wiki.archlinux.org/index.php/Install_from_existing_Linux#Method_B:_Using_the_Bootstrap_Image_.28recommended.29)),
extract the image to / and configure the _Bootstrap chroot_.
Now, about the **critical** part:
> How can you wipe the system without breaking everything?
It's simple: the script downloads and installs [busybox](http://www.busybox.net/) in the _Bootstrap chroot_.
After that, it will erase all the system directories except from the _Bootstrap chroot_, `/dev`, `/proc`, `/sys` and the like .
Busybox is statically linked, so it can still be used to chroot to the _Bootstrap chroot_ and to install _Arch Linux_.
At this point _Arch Linux_ has been installed, but not configured.
The script will provide a SSH-able system automagically configuring grub, network and restoring the root password from the original system.
Once done doing its job, the script will ask you to manually reboot your _VPS_ and voilà, PROFIT!
Does it really work?
--------------------
Yes, it does!
For the time being, the script has been tested on the following linux distros:
* CentOS 6 (x86 and x86_64)
* CentOS 7 (x86 and x86_64)
on the following _VPS_ providers:
* [CloudAtCost](http://www.cloudatcost.com/)
Contributing
------------
If you have any useful modification, please use **Pull requests**.
If you have successfully used this script on a different _distro_ - _VPS_ combination, please contact me so that I can update the above list.
If you are not a developer, but you still want to contribute, you can donate me an account on your _VPS_ provider and I'll do my best to support it.
Or you can just donate me some bucks I'll spend to buy a _VPS_ on your provider in order to support it.
Caveats
-------
[OpenVZ](http://openvz.org/), [Virtuozzo](http://www.odin.com/products/virtuozzo/), [Docker](https://www.docker.com/) or any other similar _VPS_ systems are not supported (for the time being).
In other words, it'll only work on **fully virtualized** systems.

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#!/bin/sh
# Copyright 2015, Timothy Redaelli <tredaelli@archlinux.info>
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 2 of the License, or
# (at your option) any later version.
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License at <http://www.gnu.org/licenses/> for
# more details.
: ${ARCH_MIRROR="http://mirror.rackspace.com/archlinux"}
# You don't need to edit anything below this comment
set -e
# Gathering informations about actual environment.
if which wget >/dev/null 2>&1; then
alias download='wget -nv -O-'
elif which curl >/dev/null 2>&1; then
alias download='curl -fL'
else
echo "This script needs curl or wget" >&2
exit 2
fi
cpu_type=$(uname -m)
findmnt -no SOURCE / | grep -q '^/dev/mapper/' && needs_lvm2=1 || needs_lvm2=0
download_and_extract_bootstrap() {
local sha1 filename
download "$ARCH_MIRROR"/iso/latest/sha1sums.txt | grep "$cpu_type.tar.gz" > "sha1sums.txt"
read -r sha1 filename < "sha1sums.txt"
download "$ARCH_MIRROR/iso/latest/$filename" > "$filename"
sha1sum -c sha1sums.txt || exit 1
tar -xpzf "$filename"
rm -f "$filename"
cp -R /etc/resolv.conf "/root.$cpu_type/etc"
mount --rbind /dev "/root.$cpu_type/dev"
mount -t proc proc "/root.$cpu_type/proc"
mount -t sysfs sys "/root.$cpu_type/sys"
# FIXME support multiple partitions
mount --bind / "/root.$cpu_type/mnt"
findmnt /boot >/dev/null && mount --bind /boot "/root.$cpu_type/mnt/boot"
# Workaround for Debian
mkdir -p "/root.$cpu_type/run/shm"
}
chroot_exec() {
chroot "/root.$cpu_type" /bin/bash -c "$*"
}
configure_chroot() {
# Install and initialize haveged if needed
if ! pidof haveged >/dev/null; then
download "https://www.archlinux.org/packages/extra/$cpu_type/haveged/download/" > "/root.$cpu_type/haveged.pkg.tar.xz"
chroot_exec 'pacman --noconfirm -U /haveged.pkg.tar.xz && haveged'
rm -f "/root.$cpu_type/haveged.pkg.tar.xz"
fi
# FIXME support multiple mirrors
echo 'Server = '"$ARCH_MIRROR"'/$repo/os/$arch' >> "/root.$cpu_type/etc/pacman.d/mirrorlist"
chroot_exec 'pacman-key --init && pacman-key --populate archlinux'
# Generate fstab
chroot_exec 'genfstab /mnt >> /etc/fstab'
}
save_root_pass() {
grep '^root:' /etc/shadow > "/root.$cpu_type/root.passwd"
chmod 0600 "/root.$cpu_type/root.passwd"
}
download_and_install_busybox() {
download "https://www.archlinux.org/packages/community/$cpu_type/busybox/download/" > "/root.$cpu_type/busybox.pkg.tar.xz"
chroot_exec 'pacman --noconfirm -U /busybox.pkg.tar.xz'
rm -f "/root.$cpu_type/busybox.pkg.tar.xz"
}
delete_all() {
# Delete *all* files from /
find / \( ! -path '/dev/*' -and ! -path '/proc/*' -and ! -path '/sys/*' -and ! -path '/selinux/*' -and ! -path "/root.$cpu_type/*" \) -delete 2>/dev/null || true
}
install_packages() {
local packages="base grub openssh"
if [ $needs_lvm2 -eq 1 ]; then
packages="$packages lvm2"
fi
# You can't use chroot_exec here, because the root filesystem was deleted!
"/root.$cpu_type/usr/bin/busybox" chroot "/root.$cpu_type" /usr/bin/pacstrap /mnt $packages
cp -L "/root.$cpu_type/etc/resolv.conf" /etc
}
restore_root_pass() {
sed -i '/^root:/d' /etc/shadow
cat "/root.$cpu_type/root.passwd" >> /etc/shadow
}
cleanup() {
mv "/root.$cpu_type/etc/fstab" "/etc/fstab"
awk "/\/root.$cpu_type/ {print \$2}" /proc/mounts | sort -r | xargs umount -nl
rm -rf "/root.$cpu_type/"
}
configure_bootloader() {
local root_dev=$(findmnt -no SOURCE /) root_devs= tmp=
# If you are still using eth* as interface name, disable "strange" ifnames
if grep -q '^\s*eth' /proc/net/dev; then
sed -i.bak 's/GRUB_CMDLINE_LINUX_DEFAULT="/&net.ifnames=0 /' /etc/default/grub
fi
if [ $needs_lvm2 -eq 1 ]; then
local vg
# Some distro doesn't use lvmetad by default
sed -i.bak 's/use_lvmetad = 1/use_lvmetad = 0/g' /etc/lvm/lvm.conf
vg=$(lvs --noheadings $root_dev | awk '{print $2}')
root_dev=$(pvs --noheadings | awk -v vg="$vg" '($2 == vg) { print $1 }')
fi
for root_dev in $root_dev; do
tmp=$(lsblk -npsro NAME "$root_dev" | tail -n1)
case " $root_devs " in
*" $tmp "*) ;;
*) root_devs="${root_devs:+$root_devs }$tmp" ;;
esac
done
grub-mkconfig > /boot/grub/grub.cfg
for root_dev in $root_devs; do
grub-install --target=i386-pc --recheck "$root_dev"
done
if [ $needs_lvm2 -eq 1 ]; then
mv /etc/lvm/lvm.conf.bak /etc/lvm/lvm.conf
sed -i '/HOOKS/s/block/& lvm2/' /etc/mkinitcpio.conf
mkinitcpio -p linux
fi
}
configure_network() {
local gateway dev ip
read -r _ _ gateway _ dev <<-EOF
$(ip route show 0.0.0.0/0)
EOF
ip=$(ip addr show dev "$dev" | awk '($1 == "inet") { print $2 }')
cat > /etc/systemd/network/default.network <<-EOF
[Match]
Name=$dev
[Address]
Address=$ip
[Route]
Gateway=$gateway
EOF
systemctl enable systemd-networkd sshd
}
finalize() {
cat <<-EOF
Hi,
your VM has successfully been reimaged with Arch Linux.
This script configured grub as bootloader and systemd-networkd for networking.
When you are finished with your post-installation, you'll need to reboot the VM the rough way:
# sync ; reboot -f
Then you'll be able to connect to your VM using SSH and to login using your old root password.
EOF
}
cd /
download_and_extract_bootstrap
configure_chroot
save_root_pass
download_and_install_busybox
delete_all
install_packages
restore_root_pass
cleanup
configure_bootloader
configure_network
finalize