Initial version

Signed-off-by: Knut Ahlers <knut@ahlers.me>

README.md

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+# Luzifer / flashpi
+
+This repository contains a small helper script I built to aid myself with preparing SDCards for a Raspberry PI. There is no big magic in it and you can do everything done in here by hand but this way it's more convenient...
+
+## What is done?
+
+- Download latest raspbian-lite image (optional, existing image is detected)
+- Flash image to SDCard
+- Resize partition to fill the whole card
+- Write `/etc/network/interfaces` file to enable WiFi with preconfigured password (see `interfaces.txt`)
+- Write SSH key (see `pubkey.txt`)
+- Enable SSHd on the PI
+
+## Usage
+
+The script will only work on Linux machines using the `root` user!
+
+- Insert SDCard and find its mount point using `fdisk -l`
+- Edit `interfaces.txt` and `pubkey.txt`
+- Start flash process:
+    ```bash
+    ./flash.sh <hostname of your new PI> <device of the SDCard>
+    ```

flash.sh

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+#!/bin/bash
+
+set -xe
+
+SDCARD_DEVICE=$2
+SOURCE_IMAGE=${SOURCE_IMAGE:-none}
+STORAGE_DIR=${STORAGE_DIR:-/tmp}
+SYSTEM_NAME=$1
+
+if ( test "$(uname)" != "Linux" ); then
+  echo "This script will only work on Linux. OSX is not capable of writing ext4 filesystems"
+  exit 1
+fi
+
+if ( test "$(whoami)" != "root" ); then
+  echo "Please execute me as user root or using sudo for flashing / mounting SDCARD"
+  exit 1
+fi
+
+if [ -z "$SYSTEM_NAME" ]; then
+  echo "You need to provide a system name!"
+  exit 1
+fi
+
+if [ -z "$SDCARD_DEVICE" ]; then
+  echo "You need to provide a device to modify!"
+  exit 1
+fi
+
+if ! [ -f "${SOURCE_IMAGE}" ]; then
+  echo "Did not find SOURCE_IMAGE, downloading / detecting once"
+  if ( test $(ls -1tr ${STORAGE_DIR}/*raspbian-jessie-lite.img | wc -l) -lt 1 ); then
+    curl -L https://downloads.raspberrypi.org/raspbian_lite_latest -o /tmp/raspbian.zip
+    unzip /tmp/raspbian.zip -d ${STORAGE_DIR}
+    rm /tmp/raspbian.zip
+  fi
+  SOURCE_IMAGE=$(ls -1tr ${STORAGE_DIR}/*raspbian-jessie-lite.img | head -n1)
+fi
+
+echo "Flashing Raspian image"
+dd if=${SOURCE_IMAGE} of=${SDCARD_DEVICE} bs=1048576
+
+echo "Adjusting root filesystem"
+PART_START=$(parted ${SDCARD_DEVICE} -ms unit s p | grep "^2" | cut -f 2 -d: | sed "s/s$//")
+[ "$PART_START" ] || return 1
+
+fdisk ${SDCARD_DEVICE} <<EOF
+p
+d
+2
+n
+p
+2
+$PART_START
+
+p
+w
+$(sleep 5)
+EOF
+
+e2fsck -f "${SDCARD_DEVICE}2"
+resize2fs "${SDCARD_DEVICE}2"
+e2fsck -f "${SDCARD_DEVICE}2"
+
+HERE=$(pwd)
+
+echo "Mounting SDCard"
+mkdir /tmp/pi
+mount "${SDCARD_DEVICE}2" /tmp/pi/
+cd /tmp/pi
+
+echo "Configuring network"
+cp "${HERE}/interfaces.txt" etc/network/interfaces
+
+echo "Setting hostname to ${SYSTEM_NAME}"
+echo "${SYSTEM_NAME}" > etc/hostname
+
+echo "Configuring SSH-key"
+mkdir -p home/pi/.ssh
+cp "${HERE}/pubkey.txt" home/pi/.ssh/authorized_keys
+
+echo "Fixing permissions"
+chown -R 1000:1000 home/pi/.ssh/
+chmod 0700 home/pi/.ssh
+chmod 0600 home/pi/.ssh/authorized_keys
+
+echo "Enabling SSH"
+ln -s /lib/systemd/system/ssh.socket etc/systemd/system/sockets.target.wants/ssh.socket
+
+echo "Unmounting"
+cd ~
+umount /tmp/pi
+rmdir /tmp/pi
+
+echo "Done."

interfaces.txt

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+auto lo
+iface lo inet loopback
+iface eth0 inet dhcp
+
+allow-hotplug wlan0
+auto wlan0
+iface wlan0 inet dhcp
+  wpa-ssid "my-wifi"
+  wpa-psk "topsecretpassword"
+
+
+iface default inet dhcp

pubkey.txt

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+ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIHzwqMqPrIgiOfgkTw35cVVwihnWhjFLVoXY7PZMGSdO luzifer@knut-ws01