feat: Change qcow allocation (#555)

src/disk.sh

@@ -422,6 +422,14 @@ addDevice () {
 
 DISK_EXT="$(fmt2ext "$DISK_FMT")" || exit $?
 
+if [ -z "$ALLOCATE" ]; then
+  if [[ "${DISK_FMT,,}" == "raw" ]]; then
+    ALLOCATE="Y"
+  else
+    ALLOCATE="N"
+  fi
+fi
+
 if [[ "$ALLOCATE" == [Nn]* ]]; then
   DISK_TYPE="growable"
   DISK_ALLOC="preallocation=off"

src/reset.sh

@@ -15,7 +15,7 @@ trap 'error "Status $? while: $BASH_COMMAND (line $LINENO/$BASH_LINENO)"' ERR
 : ${DEBUG:='N'}         # Disable debugging mode
 : ${COUNTRY:=''}        # Country code for mirror
 : ${CONSOLE:='N'}       # Disable console mode
-: ${ALLOCATE:='Y'}      # Preallocate diskspace
+: ${ALLOCATE:=''}       # Preallocate diskspace
 : ${ARGUMENTS:=''}      # Extra QEMU parameters
 : ${CPU_CORES:='1'}     # Amount of CPU cores
 : ${RAM_SIZE:='1G'}     # Maximum RAM amount