image installation scripts for bluetooth and ssh on a raspberry pi

burn.sh

#!/bin/sh
if test $# -ne 2
then
    echo "Usage: ./burn.sh image_name disk_name"
    exit 1
fi
img=$1
sd=$2
echo "Are you sure you want to run: (Y)"
echo "'sudo dd bs=4M if=$img of=/dev/$sd status=progress conv=fsync'"
read okay
if test "$okay" = "Y"
then
    sudo dd bs=4M if="$img" "of=/dev/$sd" status=progress conv=fsync
    sync
else
    echo "Didn't burn $img to $sd."
fi

setup-bt.sh

#!/bin/sh
set -e

root_mnt="$1"
hostname="$2"

# Set Hostname
echo "Setting Bluetooth Hostname to $hostname."
echo "PRETTY_HOSTNAME=$hostname" > "$root_mnt/etc/machine-info"

# Enable bluetooth serial services
bluet_service="bluetooth.service"
bluet_location="$root_mnt/lib/systemd/system/$bluet_service"

bluez_service="dbus-org.bluez.service"
bluez_location="$root_mnt/etc/systemd/system/$bluez_service"

service_name="$bluet_service"
serivce_loc="$bluet_location"

mark="# BT serial config"

service_str="$mark\n\
# Add -C for compatibility\n\
ExecStart=/usr/lib/bluetooth/bluetoothd -C\n\
# Add the SP profile\n\
ExecStartPost=/usr/bin/sdptool add SP\n\
# Make bluetooth discoverable\n\
ExecStartPost=/bin/hciconfig hci0 piscan"

echo "Enabling bluetooth serial services by editing '$serivce_loc'."

if grep -xq "$mark" "$serivce_loc"
then
    echo "'$serivce_loc' already edited."
else
    sudo sed -i "s|^Exec.*toothd$|$service_str|" "$serivce_loc"
fi

# create the rfcomm service to enable the bluetooth serial port from systemctl
rf_service="$root_mnt/etc/systemd/system/rfcomm.service"

echo -n "Creating rfcomm service to enable the Bluetooth serial port "
echo "from systemctl by creating '$rf_service'."

sudo cat > "$rf_service" << EOF
[Unit]
Description=RFCOMM service
After=$service_name
Requires=$service_name

[Service]
ExecStart=/usr/bin/rfcomm watch hci0 1 getty rfcomm0 115200 vt100 -a pi

[Install]
WantedBy=multi-user.target
EOF

echo "Finished setting up bluetooth."

setup-ssh.sh

#!/bin/sh
set -e

boot_mnt="$1"

# Enable ssh
echo "Enabling SSH by creating '$boot_mnt/ssh'."
sudo touch "$boot_mnt/ssh"

# Enable device tree overlay
config="$boot_mnt/config.txt"
config_str="dtoverlay=dwc2"

echo "Enabling device tree overlay by adding '$config_str' to '$config'."

if grep -xq "$config_str" "$config"
then
    echo "'$config_str' already in '$config'."
else
    sudo echo >> "$config"
    sudo echo "# Enable device tree overlay for SSH over USB" >> "$config"
    sudo echo "$config_str" >> "$config"
fi


# ??
#echo "start_x=0" >> "$boot_mnt/config.txt"

# Enable modules
cmdline="$boot_mnt/cmdline.txt"
cmdline_str="modules-load=dwc2,g_ether"
echo "Enable modules by editing '$cmdline' to include '$cmdline_str'."

if grep -q "$cmdline_str" "$cmdline"
then
    echo "'$cmdline_str' already in '$cmdline'."
else
    sudo sed -i "s/rootwait/rootwait $cmdline_str/" "$cmdline"
fi

echo "Finished setting up ssh."

setup.sh

#!/bin/sh

distro="https://downloads.raspberrypi.org/raspbian_lite_latest"

if test "$#" -ne 1
then
    echo "usage sudo ./setup.sh image"
    exit 1
fi

img="$1"
boot_mnt="$(mktemp -d)"
root_mnt="$(mktemp -d)"
hostname="raspberry-pi"

# parition and mount
sudo losetup -P /dev/loop0 "$img" || exit 1
echo "Mounting boot to $boot_mnt."
sudo mount "/dev/loop0p1" "$boot_mnt" || exit 1
echo "Mounting root to $root_mnt."
sudo mount "/dev/loop0p2" "$root_mnt" || exit 1


# setup ssh
sh setup-ssh.sh "$boot_mnt"

# setup bt
sh setup-bt.sh "$root_mnt" "$hostname"

# Unmount
echo "Unmounting '$boot_mnt'."
sudo umount "$boot_mnt"
echo "Unmounting '$root_mnt'."
sudo umount "$root_mnt"

sudo losetup -D "$img"

echo "Done!"