Don't use sudo if it doesn't exist

src/freedombone-prep

@@ -133,7 +133,12 @@ if [ ! -d ~/freedombone/$DEBIAN_FILE_NAME ]; then
     exit 4
 fi
 cd $DEBIAN_FILE_NAME
-sudo ./setup_sdcard.sh --mmc $MICROSD_DRIVE --dtb beaglebone
+
+SUDO=
+if [ -f /usr/bin/sudo ]; then
+    SUDO='sudo'
+fi
+$SUDO ./setup_sdcard.sh --mmc $MICROSD_DRIVE --dtb beaglebone
 
 echo ''
 echo ''
@@ -149,17 +154,17 @@ if [ ! -b ${MICROSD_DRIVE}1 ]; then
     fi
 fi
 
-sudo cp $MICROSD_MOUNT_POINT/BOOT/bbb-uEnv.txt $MICROSD_MOUNT_POINT/BOOT/uEnv.txt
+$SUDO cp $MICROSD_MOUNT_POINT/BOOT/bbb-uEnv.txt $MICROSD_MOUNT_POINT/BOOT/uEnv.txt
 
-sudo sed -i 's/iface eth0 inet dhcp/iface eth0 inet static/g' $MICROSD_MOUNT_POINT/rootfs/etc/network/interfaces
-sudo sed -i '/iface eth0 inet static/a\    dns-nameservers 213.73.91.35 85.214.20.141' $MICROSD_MOUNT_POINT/rootfs/etc/network/interfaces
-sudo sed -i "/iface eth0 inet static/a\    gateway $ROUTER_IP_ADDRESS" $MICROSD_MOUNT_POINT/rootfs/etc/network/interfaces
-sudo sed -i '/iface eth0 inet static/a\    netmask 255.255.255.0' $MICROSD_MOUNT_POINT/rootfs/etc/network/interfaces
-sudo sed -i "/iface eth0 inet static/a\    address $BBB_FIXED_IP_ADDRESS" $MICROSD_MOUNT_POINT/rootfs/etc/network/interfaces
-sudo sed -i '/iface usb0 inet static/,/    gateway 192.168.7.1/ s/^/#/' $MICROSD_MOUNT_POINT/rootfs/etc/network/interfaces
+$SUDO sed -i 's/iface eth0 inet dhcp/iface eth0 inet static/g' $MICROSD_MOUNT_POINT/rootfs/etc/network/interfaces
+$SUDO sed -i '/iface eth0 inet static/a\    dns-nameservers 213.73.91.35 85.214.20.141' $MICROSD_MOUNT_POINT/rootfs/etc/network/interfaces
+$SUDO sed -i "/iface eth0 inet static/a\    gateway $ROUTER_IP_ADDRESS" $MICROSD_MOUNT_POINT/rootfs/etc/network/interfaces
+$SUDO sed -i '/iface eth0 inet static/a\    netmask 255.255.255.0' $MICROSD_MOUNT_POINT/rootfs/etc/network/interfaces
+$SUDO sed -i "/iface eth0 inet static/a\    address $BBB_FIXED_IP_ADDRESS" $MICROSD_MOUNT_POINT/rootfs/etc/network/interfaces
+$SUDO sed -i '/iface usb0 inet static/,/    gateway 192.168.7.1/ s/^/#/' $MICROSD_MOUNT_POINT/rootfs/etc/network/interfaces
 
-sudo sed -i 's/nameserver.*/nameserver 213.73.91.35/g' $MICROSD_MOUNT_POINT/rootfs/etc/resolv.conf
-sudo sed -i '/nameserver 213.73.91.35/a\nameserver 85.214.20.141' $MICROSD_MOUNT_POINT/rootfs/etc/resolv.conf
+$SUDO sed -i 's/nameserver.*/nameserver 213.73.91.35/g' $MICROSD_MOUNT_POINT/rootfs/etc/resolv.conf
+$SUDO sed -i '/nameserver 213.73.91.35/a\nameserver 85.214.20.141' $MICROSD_MOUNT_POINT/rootfs/etc/resolv.conf
 
 # change the motd to show further install instructions
 echo 'Become the root user by typing:' > $MICROSD_MOUNT_POINT/rootfs/etc/motd