If defined, this variable value overrides the size of ext* partition file 
created by mkfs.
Otherwise previous logic based on ROOTFS_SIZE variable is used.

It should be set when the final file size would not be above a specific value 
due to fixed
partitionning for example.

Signed-off-by: Charles-Antoine Couret <charles-antoine.cou...@mind.be>
---
 meta/classes-recipe/image_types.bbclass | 25 +++++++++++++++++--------
 1 file changed, 17 insertions(+), 8 deletions(-)

diff --git a/meta/classes-recipe/image_types.bbclass 
b/meta/classes-recipe/image_types.bbclass
index e4939af459..cebbb61545 100644
--- a/meta/classes-recipe/image_types.bbclass
+++ b/meta/classes-recipe/image_types.bbclass
@@ -68,24 +68,33 @@ IMAGE_CMD:cramfs = "mkfs.cramfs ${IMAGE_ROOTFS} 
${IMGDEPLOYDIR}/${IMAGE_NAME}${I
 
 oe_mkext234fs () {
        fstype=$1
+       image_file_maxsize=$2
        extra_imagecmd=""
+       rootfs_file_size=$ROOTFS_SIZE
 
-       if [ $# -gt 1 ]; then
-               shift
+       if [ $# -gt 2 ]; then
+               shift 2
                extra_imagecmd=$@
        fi
 
+
+       if [[ "${image_file_maxsize}" != "\"\"" ]]; then
+               # Remove quotes to get numbers only
+               rootfs_file_size=$(echo "${image_file_maxsize}" | tr -d '"')
+       fi
+
        # If generating an empty image the size of the sparse block should be 
large
        # enough to allocate an ext4 filesystem using 4096 bytes per inode, 
this is
        # about 60K, so dd needs a minimum count of 60, with bs=1024 (bytes per 
IO)
        eval local COUNT=\"0\"
        eval local MIN_COUNT=\"60\"
-       if [ $ROOTFS_SIZE -lt $MIN_COUNT ]; then
+       if [ $rootfs_file_size -lt $MIN_COUNT ]; then
                eval COUNT=\"$MIN_COUNT\"
        fi
+
        # Create a sparse image block
-       bbdebug 1 Executing "dd if=/dev/zero 
of=${IMGDEPLOYDIR}/${IMAGE_NAME}${IMAGE_NAME_SUFFIX}.$fstype seek=$ROOTFS_SIZE 
count=$COUNT bs=1024"
-       dd if=/dev/zero 
of=${IMGDEPLOYDIR}/${IMAGE_NAME}${IMAGE_NAME_SUFFIX}.$fstype seek=$ROOTFS_SIZE 
count=$COUNT bs=1024
+       bbdebug 1 Executing "dd if=/dev/zero 
of=${IMGDEPLOYDIR}/${IMAGE_NAME}${IMAGE_NAME_SUFFIX}.$fstype 
seek=$rootfs_file_size count=$COUNT bs=1024"
+       dd if=/dev/zero 
of=${IMGDEPLOYDIR}/${IMAGE_NAME}${IMAGE_NAME_SUFFIX}.$fstype 
seek=$rootfs_file_size count=$COUNT bs=1024
        bbdebug 1 "Actual Rootfs size:  `du -s ${IMAGE_ROOTFS}`"
        bbdebug 1 "Actual Partition size: `stat -c '%s' 
${IMGDEPLOYDIR}/${IMAGE_NAME}${IMAGE_NAME_SUFFIX}.$fstype`"
        bbdebug 1 Executing "mkfs.$fstype -F $extra_imagecmd 
${IMGDEPLOYDIR}/${IMAGE_NAME}${IMAGE_NAME_SUFFIX}.$fstype -d ${IMAGE_ROOTFS}"
@@ -94,9 +103,9 @@ oe_mkext234fs () {
        fsck.$fstype -pvfD 
${IMGDEPLOYDIR}/${IMAGE_NAME}${IMAGE_NAME_SUFFIX}.$fstype || [ $? -le 3 ]
 }
 
-IMAGE_CMD:ext2 = "oe_mkext234fs ext2 ${EXTRA_IMAGECMD}"
-IMAGE_CMD:ext3 = "oe_mkext234fs ext3 ${EXTRA_IMAGECMD}"
-IMAGE_CMD:ext4 = "oe_mkext234fs ext4 ${EXTRA_IMAGECMD}"
+IMAGE_CMD:ext2 = "oe_mkext234fs ext2 \"${IMAGE_FILE_MAXSIZE:ext2}\" 
${EXTRA_IMAGECMD}"
+IMAGE_CMD:ext3 = "oe_mkext234fs ext3 \"${IMAGE_FILE_MAXSIZE:ext3}\" 
${EXTRA_IMAGECMD}"
+IMAGE_CMD:ext4 = "oe_mkext234fs ext4 \"${IMAGE_FILE_MAXSIZE:ext4}\" 
${EXTRA_IMAGECMD}"
 
 MIN_BTRFS_SIZE ?= "16384"
 IMAGE_CMD:btrfs () {
-- 
2.40.1

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