Copy custom file to /boot when flashing

Adds the ability to specify a custom file to be copied to the boot partition when flashing. I use this to write some configuration (docker-compose files and bash scripts) used for my custom host initialization.

README.md

@@ -28,6 +28,7 @@ This script can
 * copy an optional cloud-init `user-data` and `meta-data` file into the boot partition of the SD image
 * copy an optional `config.txt` file into the boot partition of the SD image (eg. to enable onboard WiFi)
 * copy an optional `device-init.yaml` or `occidentalis.txt` file into the boot partition of the SD image (for older HypriotOS versions)
+* copy an optional custom file into the boot partition of the SD image
 * optional set the hostname of this SD image
 * optional set the WiFi settings as well
 * play a little sound after flashing
@@ -89,6 +90,7 @@ OPTIONS:
    --force|-f     Force flash without security prompt (for automation)
    --userdata|-u  Copy this cloud-init config file to /boot/user-data
    --metadata|-m  Copy this cloud-init config file to /boot/meta-data
+   --file|-F      Copy this custom file to /boot
 ```
 
 If no image is specified, the script will try to configure an existing

flash

@@ -38,6 +38,7 @@ OPTIONS:
   --force|-f      Force flash without security prompt (for automation)
   --userdata|-u   Copy this cloud-init file to /boot/user-data
   --metadata|-m   Copy this cloud-init file to /boot/meta-data
+  --file|-F       Copy this file to /boot
 
 If no image is specified, the script will try to configure an existing
 image. This is useful to try several configuration without the need to
@@ -79,6 +80,7 @@ do
     --force) args="${args}-f ";;
     --userdata) args="${args}-u ";;
     --metadata) args="${args}-m ";;
+    --file) args="${args}-F ";;
     # pass through anything else
     *) [[ "${arg:0:1}" == "-" ]] || delim="\""
       args="${args}${delim}${arg}${delim} ";;
@@ -87,7 +89,7 @@ done
 # reset the translated args
 eval set -- "$args"
 # now we can process with getopt
-while getopts ":h:vc:n:s:p:C:l:d:fu:m:" opt; do
+while getopts ":h:vc:n:s:p:C:l:d:fu:m:F:" opt; do
   case $opt in
     h)  usage ;;
     v)  version ;;
@@ -101,6 +103,7 @@ while getopts ":h:vc:n:s:p:C:l:d:fu:m:" opt; do
     f)  FORCE=1 ;;
     u)  USER_DATA=$OPTARG ;;
     m)  META_DATA=$OPTARG ;;
+    F)  FILE=$OPTARG ;;
     \?) usage ;;
     :)
       echo "option -$OPTARG requires an argument"
@@ -501,6 +504,13 @@ if [ -n "${META_DATA}" ]; then
   fi
 fi
 
+if [ -n "${FILE}" ]; then
+  if [ ! -f "${FILE}" ]; then
+    echo "File ${FILE} not found!"
+    exit 10
+  fi
+fi
+
 if [ -n "${BOOT_CONF}" ]; then
   if [ ! -f "${BOOT_CONF}" ]; then
     echo "File ${BOOT_CONF} not found!"
@@ -661,6 +671,11 @@ mount_boot_disk "${disk}" "${boot}"
     cp "${META_DATA}" "${boot}/meta-data"
   fi
 
+  if [ -f "${FILE}" ]; then
+    echo "Copying file ${FILE} to ${boot}/ ..."
+    cp "${FILE}" "${boot}/"
+  fi
+
 
 if [ -f "${boot}/device-init.yaml" ]; then
   echo "Setting device-init"