Add a parameter to set free space in qemu images

Avoid the need to redimension the qemu disk size.

README.md

@@ -97,6 +97,9 @@ The following environment variables are supported:
 
    Change the keyboard default mapping (gb=qwerty, fr=azerty).
 
+ * `FREE_SPACE_MB` (Default: <int> 400)
+
+   Add a free space in the partition (value in megabyte). If Qemu image is generated it could be usefull to have a lot of free space.
 
 A simple example for building Raspbian:
 

build.sh

@@ -134,6 +134,7 @@ fi
 
 export USE_QEMU="${USE_QEMU:-0}"
 export LAST_STAGE=${LAST_STAGE:-5}
+export FREE_SPACE_MB=${FREE_SPACE_MB:-400}
 export RPI_LOCALHOST=${RPI_LOCALHOST:-"raspberrypi"}
 export RPI_USERNAME=${RPI_USERNAME:-"pi"}
 export RPI_USERPASS=${RPI_USERPASS:-"raspberry"}

config.exemple

@@ -1,6 +1,7 @@
 IMG_NAME="Raspbian"
 USE_QEMU=1
 LAST_STAGE=5
+FREE_SPACE_MB=500
 KEYBOARD_LANG="gb"
 RPI_LOCALHOST="raspberrypi"
 RPI_USERNAME="pi"

export-image/prerun.sh

@@ -16,6 +16,11 @@ ROUND_SIZE="$((4 * 1024 * 1024))"
 ROUNDED_ROOT_SECTOR=$(((2 * BOOT_SIZE + ROUND_SIZE) / ROUND_SIZE * ROUND_SIZE / 512 + 8192))
 IMG_SIZE=$(((BOOT_SIZE + TOTAL_SIZE + (800 * 1024 * 1024) + ROUND_SIZE - 1) / ROUND_SIZE * ROUND_SIZE))
 
+if [ "${USE_QEMU}" = "1" ]; then
+	log "Added ${FREE_SPACE_MB} to qemu image (${IMG_SIZE})"
+	IMG_SIZE=$(((BOOT_SIZE + TOTAL_SIZE + (FREE_SPACE_MB * 1024 * 1024) + ROUND_SIZE - 1) / ROUND_SIZE * ROUND_SIZE))
+fi
+
 truncate -s "${IMG_SIZE}" "${IMG_FILE}"
 fdisk -H 255 -S 63 "${IMG_FILE}" <<EOF
 o

export-noobs/00-release/00-run.sh

@@ -17,7 +17,7 @@ BOOT_SIZE="$(( BOOT_SIZE / 1000000 + 1))"
 ROOT_SIZE="$(( ROOT_SIZE / 1000000 + 1))"
 
 BOOT_NOM="$(( BOOT_SIZE * 3 ))"
-ROOT_NOM="$(( ROOT_SIZE + 400 ))"
+ROOT_NOM="$(( ROOT_SIZE + 400))"
 
 mv "${NOOBS_DIR}/OS.png" "${NOOBS_DIR}/${NOOBS_NAME// /_}.png"