install.sh

#!/bin/bash -e

# Check for dependencies.
hash curl grep openssl

DASHBOARD_URL=https://alohacam.io
API_URL=https://api.alohacam.io
DOWNLOAD_URL=http://get.alohacam.io
VERSION=latest
KEYFILE=key.pem
CERTFILE=cert.pem
CSRFILE=req.pem
REBOOT_REQUIRED=false

[ -e lanikai.env ] && source lanikai.env


# Identify platform and architecture.
if [ -z "$PLAT" ]; then
    case "$OSTYPE" in
        linux*)
            PLAT=linux ;;
        *)
            echo "Unsupported platform: $OSTYPE"
            exit 1 ;;
    esac
fi
if [ -z "$ARCH" ]; then
    case "$(uname -m)" in
        armv6*)
            ARCH=armv6 ;;
        armv7*)
            ARCH=armv7 ;;
        aarch64*)
            ARCH=aarch64 ;;
        *)
            echo "Unsupported architecture: $(uname -m)"
            exit 1 ;;
    esac
fi

# Download latest alohacam binary.
if [ -z "$SKIP_DOWNLOAD" ]; then
    curl -L -o alohacam $DOWNLOAD_URL/release/$VERSION/alohacam-$PLAT-$ARCH
    chmod a+x alohacam
fi

# Install rng-tools to ensure have sufficient entropy for certificates
if [ ! -e /usr/sbin/rngd ]; then
    echo "Installing rng-tools to ensure sufficient entropy for generating"
    echo "certificates (requires sudo)."
    sudo apt-get install -y rng-tools
fi

# Generate a private key, if we don't already have one.
if [ ! -e $KEYFILE ]; then
    echo "Generating private key"
    openssl ecparam -name prime256v1 -genkey -out $KEYFILE

    rm -f $CERTFILE
fi

# Request a certificate, if we don't already have one.
if [ ! -e $CERTFILE ]; then
    if [ -z "$TOKEN" ]; then
        echo "Visit the Alohacam dashboard to obtain an activation token for this device:"
        echo "    $DASHBOARD_URL/devices/"
        while [ -z "$TOKEN" ]; do
            read -r -p "Enter activation token: "
            TOKEN=$(echo "$REPLY" | tr -cd '0-9A-Za-z')
        done
    fi

    # Generate a certificate signing request. The activation token is included as
    # the Subject Common Name.
    openssl req -new -key $KEYFILE -subj "/CN=Activation:$TOKEN" -out $CSRFILE

    # Submit CSR with activation request. If successful, we'll receive a PEM-encoded
    # certificate in response.
    if curl -fsSL -F "csr=<$CSRFILE" -o $CERTFILE "$API_URL/activate-device/$TOKEN"; then
        echo "Success. You may now run Alohacam."
        rm -f $CSRFILE
    else
        echo "Unable to activate your device."
        echo "Try requesting a new activation code."
    fi
fi

# Load v4l2 driver on boot (if not already enabled).
if ! grep -q "^bcm2835-v4l2$" /etc/modules; then
    echo "Modifying /etc/modules to enable camera driver (requires sudo)"
    sudo sh -c 'echo "bcm2835-v4l2" >> /etc/modules'
fi
if ! lsmod | grep -q "^bcm2835_v4l2"; then
    echo "Loading camera driver (requires sudo)"
    sudo modprobe bcm2835-v4l2
fi

# Ensure Raspberry Pi bootloader configured to enable camera.
if ! grep -q "^start_x=1$" /boot/config.txt; then
    echo "Modifying /boot/config.txt to enable camera (requires sudo)"
    sudo sh -c 'echo "start_x=1" >> /boot/config.txt'
    REBOOT_REQUIRED=true
fi

# Reboot prompt.
if $REBOOT_REQUIRED; then
    echo "Some changes require you to reboot your Raspberry Pi."
    read -p "Reboot now (y/N)? " yesno
    case $yesno in
        [Yy]* ) sudo reboot;
    esac
else
    ./alohacam
fi