first version working

README.md

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+# How to pivot_root
+1. Stop all uneeded services
+  `systemctl isolate rescue-ssh.target`
+
+1. Create the new / on ramdisk
+  `mkdir /tmp/tmproot && mount none /tmp/tmproot -t tmpfs`
+
+1. Create all the base directories
+  `mkdir /tmp/tmproot/{proc,sys,usr,var,run,oldroot,root}`
+1. Copy the base symlink
+  `cp -ax /{bin,etc,mnt,sbin,lib} /tmp/tmproot/`
+1. Copy /dev
+  `cp -a /dev /tmp/tmproot/dev`
+
+1. Copy the libs for services
+  `lsof -Fn / | grep ^n/ | cut -c2- | sort -u | grep /usr | rsync --files-from=- / /tmp/tmproot/`
+1. Copy other libs and binaries needed
+
+    `ldd /usr/bin/{wget,gzip,dd,mount,ls,cp,cat} | grep -o '/lib[^ ]*' | sed 's/^/\/usr/' | xargs -n1 readlink -f  | rsync -v --files-from=- / /tmp/tmproot/`
+
+    `ldd /usr/bin/{wget,gzip,dd,mount,ls,cp,cat} | grep -o '/lib[^ ]*' | sed 's/^/\/usr/' | rsync -lv --files-from=- / /tmp/tmproot/`
+
+    `rsync -v /usr/bin/{wget,gzip,dd,mount,ls,cp,cat} /tmp/tmproot/usr/bin/`
+
+
+systemctl switch-root /tmp/tmproot/
+
+## OLLLD WAY NOT WORKING ANYMORE
+`unshare -m`
+`pivot_root /tmp/tmproot/ /tmp/tmproot/oldroot`
+`mount none /proc -t proc`
+`mount none /sys -t sysfs`
+`mount none /dev/pts -t devpts`
+
+Fuck I need sshd 
+
+`wget -O - https://github.com/YunoHost/arm-images/releases/download/v2020.10/internetcube_4.0.8_v2020.10_lime2.img.gz | gzip -cd | dd bs=1M oflag=direct status=progress of=/dev/mmcblk0`

Vagrantfile

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+# -*- mode: ruby -*-
+# vi: set ft=ruby :
+
+# All Vagrant configuration is done below. The "2" in Vagrant.configure
+# configures the configuration version (we support older styles for
+# backwards compatibility). Please don't change it unless you know what
+# you're doing.
+#
+# This script can test the internetcube image patching just do vagrant up
+$script = <<SCRIPT
+export DEBIAN_FRONTEND=noninteractive
+
+source /vagrant/yunocube.sh
+mkdir -p /tmp/overlay
+ln -s /vagrant /tmp/overlay/internetcube
+InstallInternetCubeServices
+
+SCRIPT
+Vagrant.configure("2") do |config|
+
+  config.vm.box = "debian/buster64"
+
+  config.vm.provider :libvirt do |libvirt|
+    libvirt.memory = 2048
+  end
+
+ # config.vm.provision "shell" do |s|
+ #   s.inline = $script
+ # end
+end

switch_root.sh

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+#!/bin/sh
+
+sudo modprobe zram num_devices=4
+echo 1G | sudo tee /sys/block/zram0/disksize
+sudo mkfs.ext4 -m0 /dev/zram0
+mkdir /tmp/sys
+sudo mount /dev/zram0 /tmp/sys
+sudo tar -cpSf - \
+    --acls --xattrs --selinux \
+    --exclude '/dev/*' \
+    --exclude '/run/*' \
+    --exclude '/sys/*' \
+    --exclude '/proc/*' \
+    --exclude '/tmp/*' \
+    --exclude '/var/tmp/*' \
+    --exclude '/var/lib/apt/*' \
+    --exclude '/var/lib/dpkg/*' \
+    --exclude '/var/run/*' \
+    --exclude '/boot/*' \
+    / |
+    sudo tar -xvf - \
+        --acls --xattrs --selinux \
+        -C /tmp/sys
+sudo truncate -s0 /tmp/sys/etc/fstab
+sudo swapoff -a
+sudo mkdir /sysroot
+sudo mount --rbind /tmp/sys /sysroot
+sudo touch /etc/initrd-release
+