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Root filesystem

Install required packages:

qemu-user-static debootstrap binfmt-support

Setup enviroment:

export targetdir=rootfs
export distro=stretch
mkdir $targetdir

Build the root file system: download the needed .deb packages and unpack it into $targetdir:

sudo debootstrap --arch=armhf --foreign $distro $targetdir
sudo cp /usr/bin/qemu-arm-static $targetdir/usr/bin
sudo cp /etc/resolv.conf $targetdir/etc
sudo chroot $targetdir

Configure and install the root filesystem by running the .deb configuration scripts inside the emulated armhf architecture (this is why qemu-arm-static is needed)
```
export distro=stretch
export LANG=C
/debootstrap/debootstrap --second-stage
```

Setup APT:

cat <<EOT > /etc/apt/sources.list
deb http://ftp.ch.debian.org/debian/ $distro main contrib non-free
deb-src http://ftp.ch.debian.org/debian/ $distro main contrib non-free
deb http://security.debian.org/debian-security $distro/updates main contrib non-free
deb-src http://security.debian.org/debian-security $distro/updates main contrib non-free
deb http://ftp.ch.debian.org/debian/ $distro-updates main contrib non-free
deb-src http://ftp.ch.debian.org/debian/ $distro-updates main contrib non-free
EOT

Disable the recommended and suggested packages automatic installation to reduce the root file system size:

cat << EOT > /etc/apt/apt.conf.d/71-no-recommends
APT::Install-Recommends "0";
APT::Install-Suggests "0";
EOT

Install required packages:

apt update
apt install locales dialog
dpkg-reconfigure locales
apt install openssh-server ntpdate resolvconf sudo less hwinfo ntp tcsh zsh vim

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