Ability to autodetect backup drive

src/freedombone

@@ -387,6 +387,9 @@ install_web_admin
 function_check setup_final
 setup_final
 
+function_check store_drives_baseline
+store_drives_baseline
+
 echo ''
 echo $"${PROJECT_NAME} installation is complete."
 echo ''

src/freedombone-backup-local

@@ -368,14 +368,23 @@ function backup_postgresql {
     backup_directory_to_usb $temp_backup_dir postgresql
 }
 
+backup_device="$1"
+
 # has the remove option been set ?
-remove_option=$2
-if [[ $1 == "remove" ]]; then
+remove_option="$2"
+if [[ "$backup_device" == "remove" ]]; then
     remove_option=$1
 fi
+if [[ "$backup_device" == "detect" || "$backup_device" == "auto"* ]]; then
+    backup_device=$(detect_connected_drives)
+    if [[ "$backup_device" != 'sd'* ]]; then
+        echo $'No backup device was detected'
+        exit 356835
+    fi
+fi
 
 gpg_agent_setup root
-backup_mount_drive "$1" "$2"
+backup_mount_drive "$backup_device" "$2"
 remove_backup_directory "$remove_option"
 make_backup_directory
 check_storage_space_remaining

src/freedombone-utils-backup

@@ -147,7 +147,7 @@ function backup_to_friends_servers {
 function backup_mount_drive {
     if [ "$1" ]; then
         if [[ "$1" == "/dev/"* ]]; then
-            USB_DRIVE=$1
+            USB_DRIVE="$1"
         else
             USB_DRIVE=/dev/${1}1
         fi
@@ -156,12 +156,12 @@ function backup_mount_drive {
     # get the admin user
     ADMIN_USERNAME=$(get_completion_param "Admin user")
     if [ "$2" ]; then
-        ADMIN_USERNAME=$2
+        ADMIN_USERNAME="$2"
     fi
     ADMIN_NAME=$(getent passwd "$ADMIN_USERNAME" | cut -d: -f5 | cut -d, -f1)
 
     if [ "$3" ]; then
-        RESTORE_APP=$3
+        RESTORE_APP="$3"
     fi
 
     # check that the backup destination is available
@@ -836,4 +836,26 @@ function backup_extra_directories {
     done <"$BACKUP_EXTRA_DIRECTORIES"
 }
 
+DRIVES_BASELINE_FILE=/root/.drives_baseline
+
+function store_drives_baseline {
+    if [ -f $DRIVES_BASELINE_FILE ]; then
+        return
+    fi
+    # shellcheck disable=SC2012
+    ls -gA /dev/sd* | awk -F '/dev/' '{print $2}' > $DRIVES_BASELINE_FILE
+}
+
+function detect_connected_drives {
+    if [ ! -f $DRIVES_BASELINE_FILE ]; then
+        # shellcheck disable=SC2012
+        ls -gA /dev/sd* | awk -F '/dev/' '{print $2}' > $DRIVES_BASELINE_FILE
+        return
+    fi
+    # shellcheck disable=SC2012
+    ls -gA /dev/sd* | awk -F '/dev/' '{print $2}' > /tmp/.drives_current
+
+    diff /tmp/.drives_current ${DRIVES_BASELINE_FILE} | awk -F '< ' '{print $2}'  | sed '/^$/d'  | sed 's/[0-9]*//g' | uniq | head -n 1
+}
+
 # NOTE: deliberately no exit 0

src/freedombone-utils-final

@@ -45,6 +45,8 @@ function install_final {
     split_gpg_key_into_fragments
     lockdown_permissions
 
+    store_drives_baseline
+
     mark_completed "${FUNCNAME[0]}"
     clear
     echo ''