diff --git a/README.md b/README.md
index e532eaa..d66f9ec 100644
--- a/README.md
+++ b/README.md
@@ -1,5 +1,7 @@
 # YunoHost installation scripts
 
+Forked version: some discussion available [here](https://forum.yunohost.org/t/building-a-new-image-for-raspberry-debian-jessie-fr-en/1101)
+
 ## Context
 
 The script `install_yunohost` will install [YunoHost](https://yunohost.org/) on a Debian system.
diff --git a/build_arm_image/.gitignore b/build_arm_image/.gitignore
new file mode 100644
index 0000000..1bdecb0
--- /dev/null
+++ b/build_arm_image/.gitignore
@@ -0,0 +1,2 @@
+_build_arm_steps
+.*.swp
diff --git a/build_arm_image/01_create_sdcard.sh b/build_arm_image/01_create_sdcard.sh
new file mode 100755
index 0000000..c975b34
--- /dev/null
+++ b/build_arm_image/01_create_sdcard.sh
@@ -0,0 +1,244 @@
+#!/bin/bash 
+#
+# Create the sdcard on your PC with the latest debian raspbian.
+#
+# Usage:
+#  ./01_create_sdcard.sh downloaded_debian_image.zip /dev/sdcard_device
+#  ./01_create_sdcard.sh generated_yunohost.img /dev/sdcard_device
+#
+# HowTo:
+#  find your sdcard device: 
+#     mount it first graphicaly
+#     next issue a df -h look for something "/dev/mmcblk0p1"
+#  create a totally new image:
+#     delete _build_arm_steps/ which is the cache folder.
+#     follows steps in README.md
+#
+# Status: functional
+# Licence: GPLv3
+# Author: sylvain303@github
+# SeeAlso: 
+
+# informations about Raspbian image:
+# Raspbian Jessie Lite Version: November 2015 Release date: 2015-11-21
+# version: SHA-1 of the .zip: 97888fcd9bfbbae2a359b0f1d199850852bf0104
+# Kernel version: 4.1
+# http://downloads.raspberrypi.org/raspbian/release_notes.txt
+
+
+# DOWNLOAD_URL used only for echo a message
+# SHA_DEBIAN_IMG_ZIP need to be updated to match your image
+DOWNLOAD_URL=https://www.raspberrypi.org/downloads/raspbian/
+SHA_DEBIAN_IMG_ZIP="6741a30d674d39246302a791f1b7b2b0c50ef9b7"
+
+die() {
+    echo "$*"
+    exit 1
+}
+
+# helper, test if a shell program exists in PATH
+test_tool() {
+    local cmd=$1
+    if type $cmd > /dev/null
+    then
+        # OK
+        return 0
+    else
+        die "tool missing: $cmd"
+    fi
+}
+
+# skip if the file exists.
+# usage: skip_if _build_arm_steps/somefile && return 2
+skip_if() {
+    if [[ -e "$1" ]]
+    then
+        echo "cached"
+        return 0
+    fi
+   # echo -n "continue for $1"
+    return 1
+}
+
+sha_verify_zip() {
+    local zip=$DEBIAN_IMG_ZIP
+
+    [[ -z "$zip" ]] && { echo "no zip refuse to run"; return 3; }
+
+    local out=_build_arm_steps/sha_verify_zip
+    skip_if $out && return 2
+    sha1sum $zip > $out
+    # read only sha check hash
+    local sha="$(sed -e 's/\(^[a-f0-9]\+\).*/\1/' $out)"
+    if [[ "$sha" != "$SHA_DEBIAN_IMG_ZIP" ]]
+    then
+        die "NOK: '$sha' != '$SHA_DEBIAN_IMG_ZIP'"
+    fi
+}
+
+# unzip raspbian image in the cache folder
+unzip_img() {
+    local img_filename=$(unzip -l $DEBIAN_IMG_ZIP | awk '/\.img$/ { print $4 }')
+    if ! skip_if _build_arm_steps/$img_filename
+    then
+        unzip -o $DEBIAN_IMG_ZIP -d _build_arm_steps
+    fi
+
+    # get extrated image filename from zip file
+    DEBIAN_IMG="_build_arm_steps/$img_filename"
+}
+
+# helper, try to guess top device name
+# /dev/sdp2 => /dev/sdp
+# /dev/mmcblk0p1 => /dev/mmcblk0
+# just some regexp, no smart thing
+get_top_device() {
+    local device="$1"
+    local regexp1='^/dev/sd[a-z]'
+    local regexp2='^/dev/mmcblk[0-9]'
+
+    if [[ "$device" =~ $regexp1 ]]
+    then
+        #echo sd
+        device="${device/[0-9]/}"
+    elif [[ "$device" =~ $regexp2 ]]
+    then
+        #echo mmcblk
+        device="${device/p[0-9]/}"
+    fi
+
+    echo "$device"
+}
+
+# helper, umount the sdcard partition if any
+umount_sdcard_partition() {
+    [[ -z "$SDCARD" ]] && { echo '$SDCARD is empty refusing to run'; return; }
+    local p
+    # search and replace all occurence of / by .
+    local pattern=${SDCARD////.}
+    pattern=${pattern/p[0-9]/}
+    for p in $(df | awk "/^$pattern/ { print \$1 }")
+    do
+        sudo umount $p
+    done
+    echo "done device for sdcard=${pattern//.//}"
+}
+
+dd_to_sdcard() {
+    [[ -z "$SDCARD" ]] && { echo '$SDCARD is empty refusing to run'; return; }
+    # ensure that sdcard partitions are unmounted with umount_sdcard_partition
+    echo "starting dd it will take some times…"
+    sudo dd bs=16M if="$DEBIAN_IMG" of=$SDCARD
+    sudo sync
+}
+
+test_all_tools() {
+    for t in $*
+    do
+        test_tool $t
+    done
+}
+
+# mount the .img so we can write on it before copying on the sdcard
+mount_loopback_img() {
+    [[ -z "$DEBIAN_IMG" ]] && { echo '$DEBIAN_IMG is empty refusing to run'; return; }
+    mkdir -p _build_arm_steps/mnt
+    local dev_loop0=$(sudo losetup -f --show "$DEBIAN_IMG")
+    local part_offset=$(sudo fdisk -l $dev_loop0 | awk '/Linux/ { print $2 }')
+    # mount the ext4 partition at computed offset
+    local dev_loop1=$(sudo losetup -f --show -o $((512 * $part_offset)) "$DEBIAN_IMG")
+    sudo mount $dev_loop1 _build_arm_steps/mnt/
+}
+
+umount_loopback_img() {
+    # find mounted loopback
+    local dev_loop1=$(mount | awk '/_build_arm_steps/ { print $1 }')
+    # compute loop n-1
+    local n=${dev_loop1#/dev/loop}
+    local dev_loop0="/dev/loop$(($n - 1))"
+    sudo umount _build_arm_steps/mnt
+    sudo losetup -d $dev_loop1
+    sudo losetup -d $dev_loop0
+}
+
+# copy a local key for ssh without password later
+# having an ssh-key pair to remote connect on the raspi will be used by the next step
+add_ssh_key_to_img() {
+    mount_loopback_img
+    cd _build_arm_steps/mnt/home/pi/
+    mkdir .ssh
+    local ssh_key=$OLDPWD/_build_arm_steps/nopasskey
+    # silently generate an ssh-key pair
+    yes | ssh-keygen -q -t rsa -C "nopasskey-install" -N "" -f $ssh_key > /dev/null
+    cp ${ssh_key}.pub .ssh/authorized_keys
+    # remove some permissions
+    chmod -R go= .ssh/
+    # give to pi user id
+    sudo chown  -R --reference . .ssh
+    # return to working folder
+    cd - > /dev/null
+    umount_loopback_img
+    echo "ssh-key added"
+}
+
+# functions call in that order, edit remove a long running step if already done or if
+# you want to skip it, step states are saved in folder _build_arm_steps and skipped automatically.
+# STEPS is modifiy in main() if argument1 is an .img and not a .zip
+STEPS="
+sha_verify_zip
+unzip_img
+add_ssh_key_to_img
+umount_sdcard_partition
+dd_to_sdcard"
+
+# main wrapper, so the script can be sourced for debuging purpose or unittesting
+main() {
+    # positional argument must be script argument.
+    # init
+    if [[ -z "$1" ]]
+    then
+        echo "argument 1 error: expecting raspbian image file.zip or an img"
+        echo "can be downloaded here: $DOWNLOAD_URL"
+        exit 1
+    fi
+
+    local regexp='\.img$'
+
+    # reading script argument
+    DEBIAN_IMG_ZIP=$1
+    if [[ "$1" =~ $regexp ]]
+    then
+        DEBIAN_IMG="$1"
+        DEBIAN_IMG_ZIP=""
+        # write image verbatim without modification
+        STEPS="
+        umount_sdcard_partition
+        dd_to_sdcard"
+    else
+        [[ -f "$DEBIAN_IMG_ZIP" ]] || die "error raspbian image not found: '$DEBIAN_IMG_ZIP'"
+    fi
+
+    SDCARD=$(get_top_device "$2")
+    [[ -z "$SDCARD" ]] && die "argument 2 error: expecting sdcard_device"
+
+    test_all_tools dd sync sudo losetup ssh-keygen
+    mkdir -p _build_arm_steps
+
+    # actions loop
+    for s in $STEPS
+    do
+        echo -n "$s: "
+        eval $s
+    done
+}
+
+# sourcing code detection, if code is sourced for debug purpose, main is not executed.
+[[ $0 != "$BASH_SOURCE" ]] && sourced=1 || sourced=0
+if  [[ $sourced -eq 0 ]]
+then
+    # pass positional argument as is
+    main "$@"
+else
+    # just print STEPS so I can copy/paste to call them interactivly
+    echo $STEPS
+fi
diff --git a/build_arm_image/02_install_yunohost.sh b/build_arm_image/02_install_yunohost.sh
new file mode 100755
index 0000000..a441215
--- /dev/null
+++ b/build_arm_image/02_install_yunohost.sh
@@ -0,0 +1,252 @@
+#!/bin/bash
+#
+# Usage: ./02_install_yunohost.sh DHCP_IP_ADDRESS_OF_RASPBERRYPI
+#
+# Doc: See README.md
+#
+# STEPS:
+#  1. enlarge filesystem with raspi-config --expand-rootfs and reboot
+#  2. run install_yunohostv2 on the raspi
+#  3. install an yunohost-firstboot script and shutdown
+# 
+# Status: functional
+# Licence: GPLv3
+# Author: sylvain303@github
+
+# wrapper to use ssh with our nopasskey
+# Usage: sshpi "some remote commands"
+sshpi() {
+    ssh -i _build_arm_steps/nopasskey pi@$PI_IP "$@"
+}
+
+# harcoded test IP, you can change for yours for debuging. See main()
+PI_IP=192.168.1.2
+# the installer script is used localy, no git clone else where.
+YUNOHOST_INSTALL=../install_yunohostv2
+# the folder on the raspberrypi, where script are uploaded
+YUNOHOST_REMOTE_DIR=/tmp/install_yunohost
+# dummy password
+PASSROOT='Free_money?yunomakeit'
+
+# used by main() See at the end.
+ask_root_pass() {
+    echo "HINT: very good program to generate strong memorisable passwords: pwqgen"
+    echo "HINT: sudo apt-get install passwdqc"
+    echo -n "Enter a new root password for raspberrypi: "
+    read PASSROOT
+}
+
+# helper to "scp" a local script to the raspberrypi
+# Usage: scp_yunohost local_filename
+scp_yunohost() {
+    if [[ -z "$1" ]]
+    then
+        echo "scp_yunohost: expect a local filename"
+        return 1
+    fi
+
+    if [[ ! -f "$1" ]]
+    then
+        echo "scp_yunohost: filename not found: '$1'"
+        return 1
+    fi 
+
+    if [[ -z "$YUNOHOST_REMOTE_DIR" ]]
+    then
+        echo "scp_yunohost: error \$YUNOHOST_REMOTE_DIR is empty"
+        return 1
+    fi
+
+    local script="$1"
+    local scriptb="$(basename $script)"
+
+    # no real scp, just wrap with sshpi
+    cat "$script" | \
+    sshpi "mkdir -p $YUNOHOST_REMOTE_DIR && \
+        cat > $YUNOHOST_REMOTE_DIR/$scriptb && \
+        chmod a+x $YUNOHOST_REMOTE_DIR/$scriptb
+        "
+}
+
+# helper, compute common remote_step script name so they can be skiped by do_step
+make_step_file() {
+    local step_name="$1"
+    local step_file="yuno_step_${step_name}.sh"
+    echo $step_file
+}
+
+# helper will create a local script and upload it to raspberrypi in $YUNOHOST_REMOTE_DIR
+# Usage: create_remote_script $FUNCNAME "shell commands…"
+create_remote_script() {
+    local step_file=$(make_step_file "$1")
+    local actions="$2"
+    local dst="_build_arm_steps/$step_file"
+
+    echo '#!/bin/bash' > $dst
+    echo "# $1" >> $dst
+    echo "$actions" >> $dst
+    scp_yunohost $dst
+
+    # the remote file on the raspi
+    echo $YUNOHOST_REMOTE_DIR/$step_file
+}
+
+# ======================= ACTIONS - remote actions steps to be performed on the raspberrypi.
+
+init_sdcard_and_reboot() {
+    local actions="
+# fix locale warning
+sudo sed -i -e '/\(en_US\|fr_FR\)\.UTF-8/ s/^# //' /etc/locale.gen
+sudo locale-gen
+# enlarge filesystem, we need more space to install yunohost
+sudo raspi-config --expand-rootfs
+echo 'rebooting raspberrypi…'
+sudo reboot
+"
+    create_remote_script $FUNCNAME "$actions"
+}
+
+install_yunohostv2_on_sdcard() {
+    local actions="
+# change root password
+echo 'root:$PASSROOT' | sudo chpasswd
+# some packages
+sudo apt-get -y install git
+cat << ENDMSG
+!!!!!!!!!!!!!!!!!!!!!!! sdcard builder !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
+Launching unattended install_yunohostv2 which will take some time to run…
+You can watch using a new ssh connection to the raspberrypi.
+By example issuing those commands:
+ cd $PWD
+ source 02_install_yunohost.sh
+ sshpi
+ tail -f /var/log/yunohost-installation.log
+!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
+ENDMSG
+# run yunohost installer unattended (scp previously with scp_yunohost)
+cd /tmp/install_yunohost && sudo ./install_yunohostv2 -a
+"
+    create_remote_script $FUNCNAME "$actions"
+}
+
+finalize_yunohost() {
+    local actions="
+# uploaded modified or new config files to the raspberrypi
+cd /
+sudo tar xzf $YUNOHOST_REMOTE_DIR/etc.tgz
+# yunohost-firstboot is an helper to cleanup and resizefs with srinked sdcard
+# image
+sudo chmod a+x /etc/init.d/yunohost-firstboot
+sudo insserv /etc/init.d/yunohost-firstboot
+cat << ENDMSG
+=================================================================================
+We are going to shutdown the raspberrypi now.
+When it's done, the yunohost image is ready to be copied back on your comupter.
+* Unplug raspberrypi
+* remove the sdcard
+* Go to next step!
+=================================================================================
+ENDMSG
+# remove pi user, we will not be able to ssh connect anymore
+# sudo userdel pi
+sudo shutdown -h now
+"
+    create_remote_script $FUNCNAME "$actions"
+}
+
+reboot_pi() {
+    echo "${FUNCNAME}…"
+    sshpi "sudo reboot"
+}
+
+# ======================= END ACTIONS
+
+# helper, simply visualy wait for raspberrypi to come up for ssh
+# Usage: wait_raspberrypi || some_fail command
+wait_raspberrypi() {
+    local max=30
+    local n=1
+    local up=false
+    while [[ $n -le $max ]]
+    do
+        sleep 1
+        # remove redirect to /dev/null to debug
+        output=$(timeout 2 ssh -o "StrictHostKeyChecking=no" \
+            -i _build_arm_steps/nopasskey pi@$PI_IP 'echo up' 2> /dev/null)
+        echo -n .
+        if [[ "$output" == 'up' ]]
+        then
+            up=true
+            break
+        fi
+        n=$(($n + 1))
+    done
+
+    if $up
+    then
+        echo up
+        return 0
+    else
+        echo too_long
+        echo "something goes wrong for your raspberrypi or the timeout it too short"
+        echo "please retry"
+        return 1
+    fi
+}
+
+# wrapper, execute a step script on the raspberrypi or skip it
+# Status: draft
+do_step() {
+    local step=$1
+    local step_file=$(make_step_file $step)
+    local remote_step
+    echo -n "$step: "
+    # skip if script already there
+    if [[ -e "_build_arm_steps/$step_file" ]]
+    then
+        echo "SKIPED"
+        return 1
+    else
+        echo "RUNING"
+        remote_step=$(eval $step)
+        sshpi $remote_step
+        return 0
+    fi
+}
+
+# main script code, wrapped inside a function, so the whole script can also be
+# sourced as a lib, for debug or unittesting purpose.
+main() {
+    # you can comment the 2 lines, for debuging. Fix PI_IP with your dhcp IP.
+    PI_IP=$1
+    ask_root_pass
+
+    do_step init_sdcard_and_reboot
+
+    wait_raspberrypi || return 1
+
+    scp_yunohost $YUNOHOST_INSTALL
+    NEED_REBOOT=false
+    do_step install_yunohostv2_on_sdcard && { NEED_REBOOT=true; }
+
+    # backup the installation.log on the PC
+    sshpi "cat /var/log/yunohost-installation.log" > \
+        _build_arm_steps/yunohost-installation.log 
+
+    $NEED_REBOOT && reboot_pi
+
+    wait_raspberrypi || return 1
+
+    # was ./intsall_arm.sh
+    tar czf _build_arm_steps/etc.tgz etc
+    scp_yunohost _build_arm_steps/etc.tgz
+    do_step finalize_yunohost
+}
+
+# sourcing code detection, if code is sourced for debug purpose, main is not executed.
+[[ $0 != "$BASH_SOURCE" ]] && sourced=1 || sourced=0
+if  [[ $sourced -eq 0 ]]
+then
+    # pass positional argument as is
+    main "$@"
+fi
diff --git a/build_arm_image/03_copy_sdcard_to_img.sh b/build_arm_image/03_copy_sdcard_to_img.sh
new file mode 100755
index 0000000..760fc61
--- /dev/null
+++ b/build_arm_image/03_copy_sdcard_to_img.sh
@@ -0,0 +1,157 @@
+#!/bin/bash
+#
+# Create the image file from the sdcard
+#
+# Usage:
+#  ./03_copy_sdcard_to_img.sh /dev/sdcard_device
+#
+# the resulting image will be stored in _build_arm_steps
+#
+# Status: prototype
+# Licence: GPLv3
+# Author: sylvain303@github
+
+die() {
+    echo "$*"
+    exit 1
+}
+
+# helper, test if a shell program exists in PATH
+test_tool() {
+    local cmd=$1
+    if type $cmd > /dev/null
+    then
+        # OK
+        return 0
+    else
+        die "tool missing: $cmd"
+    fi
+}
+
+# helper, try to guess top device name
+# /dev/sdp2 => /dev/sdp
+# /dev/mmcblk0p1 => /dev/mmcblk0
+# just some regexp, no smart thing
+get_top_device() {
+    local device="$1"
+    local regexp1='^/dev/sd[a-z]'
+    local regexp2='^/dev/mmcblk[0-9]'
+
+    if [[ "$device" =~ $regexp1 ]]
+    then
+        #echo sd
+        device="${device/[0-9]/}"
+    elif [[ "$device" =~ $regexp2 ]]
+    then
+        #echo mmcblk
+        device="${device/p[0-9]/}"
+    fi
+
+    echo "$device"
+}
+
+# helper, umount the sdcard partition if any
+umount_sdcard_partition() {
+    [[ -z "$SDCARD" ]] && { echo '$SDCARD is empty refusing to run'; return; }
+    local p
+    # search and replace all occurence of / by .
+    local pattern=${SDCARD////.}
+    pattern=${pattern/p[0-9]/}
+    for p in $(df | awk "/^$pattern/ { print \$1 }")
+    do
+        sudo umount $p
+    done
+    echo "done device for sdcard=${pattern//.//}"
+}
+
+dd_from_sdcard() {
+    [[ -z "$SDCARD" ]] && { echo '$SDCARD is empty refusing to run'; return; }
+    [[ -z "$OUTPUT_IMG" ]] && { echo '$OUTPUT_IMG is empty refusing to run'; return; }
+    local count
+    if [[ ! -z "$1" ]]
+    then
+        count="count=$1"
+    fi
+    # ensure that sdcard partitions are unmounted with umount_sdcard_partition
+    sudo dd bs=16M if=$SDCARD of=_build_arm_steps/$OUTPUT_IMG $count
+}
+
+test_all_tools() {
+    for t in $*
+    do
+        test_tool $t
+    done
+}
+
+# debug, not used
+mount_sdcard_data_partition() {
+    local part_data=2
+    [[ ! -d _build_arm_steps/sdcard ]] && mkdir _build_arm_steps/sdcard
+    sudo mount ${SDCARD}p2 _build_arm_steps/sdcard
+}
+
+# prototype, not used. Wanna test if I can d.d only used part of the partion, and fix it back on the PC
+# not working yet, may be not achieved anyway…
+get_used_partition_size() {
+    local start_offset=$(sudo fdisk -l /dev/mmcblk0 | awk '/Linux/ { print $2 * 512 }')
+    local used=$(df -B1 _build_arm_steps/sdcard | awk '/dev.mmcblk0p2/ { print $3 }')
+
+    echo "start_offset=$start_offset"
+    echo "used        =$used"
+
+    local count=$(($start_offset + $used))
+    echo "count       =$count"
+    local div=$(($count / (16 * 1048576) ))
+    echo "16M         =$(($count /      (16 * 1048576) ))"
+    echo "verif       =$(( ($div + 1) * (16 * 1048576) ))"
+}
+
+shrink_img() {
+    echo "shrinking _build_arm_steps/$OUTPUT_IMG"
+    sudo ./autosizer.sh _build_arm_steps/$OUTPUT_IMG
+}
+
+# functions call in that order, edit remove a long running step if already done or if
+# you want to skip it, step states are saved in folder _build_arm_steps and skipped automatically.
+STEPS="
+umount_sdcard_partition
+dd_from_sdcard
+shrink_img"
+
+# main wrapper, so the script can be sourced for debuging purpose or unittesting
+main() {
+    # positional argument must be script argument.
+    # init
+    if [[ -z "$1" ]]
+    then
+        echo "argument 1 error: expecting sdcard_device"
+        exit 1
+    fi
+
+    test_all_tools dd sync sudo losetup
+    if [[ ! -d _build_arm_steps ]]
+    then
+        die "cannot find _build_arm_steps/ folder are you following build step?"
+    fi
+    # reading script argument
+    SDCARD=$(get_top_device "$1")
+    OUTPUT_IMG="$(date "+%Y-%m-%d")_yunohost_rasbian-jessie.img"
+
+    # actions loop
+    for s in $STEPS
+    do
+        echo -n "$s: "
+        eval $s
+    done
+}
+
+# sourcing code detection, if code is sourced for debug purpose, main is not executed.
+[[ $0 != "$BASH_SOURCE" ]] && sourced=1 || sourced=0
+if  [[ $sourced -eq 0 ]]
+then
+    # pass positional argument as is
+    main "$@"
+else
+    # just print STEPS so I can copy/paste to call them interactivly
+    echo $STEPS
+fi
diff --git a/build_arm_image/README.md b/build_arm_image/README.md
new file mode 100644
index 0000000..f5ac192
--- /dev/null
+++ b/build_arm_image/README.md
@@ -0,0 +1,152 @@
+# Build your own yunohost image for Raspberry Pi
+
+This folder contains helper scripts to build an arm image of yunohost for raspberry.
+The files here are for builder. They are not needed to install your yunohost, the purpose is to reproduce the .img.
+Of course you can try the step exlained here, and you will get a fresh yunohost at the end.
+
+The folder etc/ structure maps debian OS folders, shell script here are helpers.
+Files in etc/ subfolders will be copied on the sdcard when installation is finished.
+
+Those scripts are following the steps provided here: https://yunohost.org/#/build_arm_image
+
+### Notes:
+
+`01_create_sdcard.sh` can be used to copy raspbian image to a sdcard and stop here, without yunohost.
+An ssh key is added to remote access pi@raspbian account without passphrase.
+
+Ex:
+```
+ssh -i _build_arm_steps/nopasskey pi@DHCP_IP
+```
+
+Don't forget to at first: `sudo raspbi-config` + enlarge file-system to have full size sdcard for your raspberry.
+(also accomplished by: `sudo raspi-config --expand-rootfs`)
+Enjoy.
+
+## License
+All the content here is distributed under [GPLv3](http://www.gnu.org/licenses/gpl-3.0.txt).
+
+## See also
+* https://forum.yunohost.org/t/building-a-new-image-for-raspberry-debian-jessie-fr-en/1101/13 - discussion about building a new image for Raspberry Pi.
+* http://build.yunohost.org/ - some build here
+
+## Files
+
+Description of the files available here.
+
+All step stripts are using your PC to store some files in the folder `_build_arm_steps/`.  This folder will be created by `01_create_sdcard.sh`. You can wipe it, or remove selected script data form it, to redo a step.
+
+All step scripts are designed to run in this folder on your PC:
+
+~~~bash
+git clone this_repos
+cd path_to/build_arm_image/
+./01_create_sdcard.sh raspbian-jessie.zip /dev/mmcblk0
+# plug and boot raspberrypi
+./02_install_yunohost.sh 192.168.1.200
+# unplug raspberrypi and connect the sdcard back to the PC
+./03_copy_sdcard_to_img.sh /dev/mmcblk0
+~~~
+
+### Steps
+
+Scripts are prefixed by a number which is the order they must be ran.
+
+#### 01_create_sdcard.sh
+
+Create a bootable image for raspbian. You have to download the .zip of the raspbian image.
+([See:](https://www.raspberrypi.org/downloads/raspbian/)
+
+This script embeds sudo call for using `dd` to copy the raw image to the sdcard. 
+It will add an ssh key to `pi` default rasbian user in order to connect later to continue automated installation (See `02_install_yunohost.sh`)
+The pi user will be removed at the end (Not yet, See #4). The ssh key-pair is generated only for you, in `_build_arm_steps/`
+
+Usage:
+
+~~~
+./01_create_sdcard.sh image_rasbian.zip /dev/device_to_sdcard
+~~~
+
+It takes some minutes to perform all the steps (~ 2m3.867s at last run). Be patient.
+
+Use commend like `df` or `lsblk` to find the name of your sdcard device. The script is taking care of umonting the partition if any. 
+It also guesses the disk's name if you gave a partition's name instead of entire disk device's name. i
+(ex: /dev/mmcblk0p2 --> /dev/mmcblk0)
+
+BE CAREFULL not to wipe the wrong device!
+
+#### 02_install_yunohost.sh
+
+Should I say: you have to plug the new sdcard freshly created and boot the Raspberry PI pluged on the same network as your PC?
+
+The Raspberry has hopefully booted and is displaying a console's prompt, which looks like:
+
+~~~
+Raspbian GNU/Linux 8 raspberrypi tty1
+
+raspberrypi login:
+~~~
+
+If DHCP has done its job well, you also have an IP address on the Raspberry PI console screen:
+
+~~~
+My IP address is 192.168.1.123
+~~~
+
+Or what ever your DHCP is giving…
+
+Run (on the PC, not the raspberry):
+
+~~~bash
+./02_install_yunohost.sh 192.168.1.123
+~~~
+
+This step is quite long. It took ~24min on my Raspberry. Be patient.
+A message will be displayed on the screen to explain how you can watch it if you want.
+
+If you got ssh `Host key verification failed.`, to fix it then:
+
+~~~bash
+rm _build_arm_steps/yuno_step*
+# retry
+./02_install_yunohost.sh 192.168.1.123
+~~~
+
+#### 03_copy_sdcard_to_img.sh
+
+When the build is finished, the Raspberry will shutdown. Unplug and insert the sdcard back in the computer.
+
+~~~bash
+./03_copy_sdcard_to_img.sh /dev/sdcard_device
+~~~
+
+This will ask your sudo password and `dd` the resulting img from the sdcard back to your PC. 
+Stored in `_build_arm_steps/` folder. It takes arround 6min on my PC to copy an sdcard of 8G.
+
+The image will be automaticly shrinked to its minimal size using autosizer.sh. 
+
+
+#### test the image back
+
+You can test the resutling image back again with `01_create_sdcard.sh`.
+
+~~~bash
+./01_create_sdcard.sh _build_arm_steps/newly_created_image.img /dev/sdcard_device
+~~~
+
+#### share
+
+You can zip, bzip2, or…, and share your freshly created yunohost image on the [forum](https://forum.yunohost.org).
+
+Enjoy!
+
+### Helper
+
+#### autosizer.sh
+
+Used on your PC to compact the dd image you will copy back after the rapsbian has been built.
+This script requier root privilege to run and modify the local sdcard image.
+
+
+## See also
+* https://github.com/likeitneverwentaway/rpi_buildbot
diff --git a/build_arm_image/autosizer.sh b/build_arm_image/autosizer.sh
new file mode 100755
index 0000000..f7726bc
--- /dev/null
+++ b/build_arm_image/autosizer.sh
@@ -0,0 +1,46 @@
+#!/bin/bash
+# Automatic Image file resizer
+# Written by SirLagz
+#
+# got from: http://sirlagz.net/2013/03/10/script-automatic-rpi-image-downsizer/
+#
+# Usage: sudo autosizer.sh sdcard.img
+
+strImgFile=$1
+
+if [[ ! $(whoami) =~ "root" ]]; then
+    echo ""
+    echo "**********************************"
+    echo "*** This should be run as root ***"
+    echo "**********************************"
+    echo ""
+    exit
+fi
+
+if [[ -z $strImgFile ]]; then
+    echo "Usage: ./autosizer.sh <Image File>"
+    exit
+fi
+
+if [[ ! -e $strImgFile || ! $(file $strImgFile) =~ "DOS/MBR boot sector" ]]; then
+    echo "Error : Not an image file, or file doesn't exist"
+    exit
+fi
+
+partinfo=`parted -m $strImgFile unit B print`
+partnumber=`echo "$partinfo" | grep ext4 | awk -F: ' { print $strImgFile } '`
+partstart=`echo "$partinfo" | grep ext4 | awk -F: ' { print substr($2,0,length($2)-1) } '`
+loopback=`losetup -f --show -o $partstart $strImgFile`
+e2fsck -f $loopback
+minsize=`resize2fs -P $loopback | awk -F': ' ' { print $2 } '`
+minsize=`echo $minsize+1000 | bc`
+resize2fs -p $loopback $minsize
+sleep 1
+losetup -d $loopback
+partnewsize=`echo "$minsize * 4096" | bc`
+newpartend=`echo "$partstart + $partnewsize" | bc`
+# TODO: 2 is probably $partnumber
+part1=`parted $strImgFile rm 2`
+part2=`parted $strImgFile unit B mkpart primary $partstart $newpartend`
+endresult=`parted -m $strImgFile unit B print free | tail -1 | awk -F: ' { print substr($2,0,length($2)-1) } '`
+truncate -s $endresult $strImgFile
diff --git a/build_arm_image/etc/init.d/yunohost-firstboot b/build_arm_image/etc/init.d/yunohost-firstboot
new file mode 100755
index 0000000..78c9ac3
--- /dev/null
+++ b/build_arm_image/etc/init.d/yunohost-firstboot
@@ -0,0 +1,27 @@
+#!/bin/sh
+### BEGIN INIT INFO
+# Provides: expand rootfs and Generates new ssh host keys on first boot
+# Required-Start: $remote_fs $syslog
+# Required-Stop: $remote_fs $syslog
+# Default-Start: 2 3 4 5
+# Default-Stop:
+# Short-Description: Generates new ssh host keys on first boot
+# Description: Generatesapt-get --purge clean new ssh host keys on $
+### END INIT INFO
+echo "Expanding rootfs ..."
+raspi-config --expand-rootfs
+echo "Generating new ssh keys ..."
+# Delete SSH keys
+rm -f /etc/ssh/ssh_host_*
+yes | ssh-keygen -f /etc/ssh/ssh_host_rsa_key -N '' -t rsa
+yes | ssh-keygen -f /etc/ssh/ssh_host_dsa_key -N '' -t dsa
+yes | ssh-keygen -f /etc/ssh/ssh_host_ecdsa_key -N '' -t ecdsa -b 521
+echo "Deleting logs ..."
+find /var/log -type f -exec echo > {} \;
+echo "Purging apt ..."
+apt-get --purge clean
+echo "Removing myself ..."
+insserv -r /etc/init.d/yunohost-firstboot
+rm -f /etc/init.d/yunohost-firstboot
+echo "Rebooting ..."
+reboot