[oe] [PATCH] Auto resizing ext2/ext3 images (from Poky)

[Marcin Juszkiewicz]

During my work for OpenedHand I wrote one usefull thing which we used for
ext2/ext3 images - autosizing.

In few words: it checks how big rootfs is, adds IMAGE_EXTRA_SPACE amount
of kilobytes to it and gives that size to genext2fs.

Below is a patch with code changes. Check it and say what You think about
it. One thing is missing - support for fixed size ext2/3 images big enough
to fit resulting rootfs.

diff --git a/classes/image.bbclass b/classes/image.bbclass
index e9c0ecd..901ab34 100644
--- a/classes/image.bbclass
+++ b/classes/image.bbclass
@@ -107,6 +107,7 @@ fakeroot do_rootfs () {
 
 	${IMAGE_PREPROCESS_COMMAND}
 
+	ROOTFS_SIZE=`du -ks ${IMAGE_ROOTFS}|awk '{print ${IMAGE_EXTRA_SPACE} + $1}'`
 	${@get_imagecmds(d)}
 
 	${IMAGE_POSTPROCESS_COMMAND}
diff --git a/conf/bitbake.conf b/conf/bitbake.conf
index 8a754fd..159f17f 100644
--- a/conf/bitbake.conf
+++ b/conf/bitbake.conf
@@ -302,9 +302,9 @@ IMAGE_CMD = ""
 IMAGE_CMD_jffs2 = "mkfs.jffs2 -x lzo --root=${IMAGE_ROOTFS} --faketime --output=${DEPLOY_DIR_IMAGE}/${IMAGE_NAME}.rootfs.jffs2 ${EXTRA_IMAGECMD}"
 IMAGE_CMD_yaffs2 = "mkyaffs2image ${EXTRA_IMAGECMD} ${IMAGE_ROOTFS} ${DEPLOY_DIR_IMAGE}/${IMAGE_NAME}.rootfs.yaffs2"
 IMAGE_CMD_cramfs = "mkcramfs ${IMAGE_ROOTFS} ${DEPLOY_DIR_IMAGE}/${IMAGE_NAME}.rootfs.cramfs ${EXTRA_IMAGECMD}"
-IMAGE_CMD_ext2 = "genext2fs -b ${IMAGE_ROOTFS_SIZE} -d ${IMAGE_ROOTFS} ${DEPLOY_DIR_IMAGE}/${IMAGE_NAME}.rootfs.ext2 ${EXTRA_IMAGECMD}"
+IMAGE_CMD_ext2 = "genext2fs -b ${ROOTFS_SIZE} -d ${IMAGE_ROOTFS} ${DEPLOY_DIR_IMAGE}/${IMAGE_NAME}.rootfs.ext2 ${EXTRA_IMAGECMD}"
 IMAGE_CMD_ext2.gz = "rm -rf ${DEPLOY_DIR_IMAGE}/tmp.gz && mkdir ${DEPLOY_DIR_IMAGE}/tmp.gz; genext2fs -b ${IMAGE_ROOTFS_SIZE} -d ${IMAGE_ROOTFS} 
${DEPLOY_DIR_IMAGE}/tmp.gz/${IMAGE_NAME}.rootfs.ext2 ${EXTRA_IMAGECMD}; gzip -f -9 ${DEPLOY_DIR_IMAGE}/tmp.gz/${IMAGE_NAME}.rootfs.ext2; mv 
${DEPLOY_DIR_IMAGE}/tmp.gz/${IMAGE_NAME}.rootfs.ext2.gz ${DEPLOY_DIR_IMAGE}/${IMAGE_NAME}.rootfs.ext2.gz; rmdir ${DEPLOY_DIR_IMAGE}/tmp.gz"
-IMAGE_CMD_ext3 = "genext2fs -b ${IMAGE_ROOTFS_SIZE} -d ${IMAGE_ROOTFS} ${DEPLOY_DIR_IMAGE}/${IMAGE_NAME}.rootfs.ext3 ${EXTRA_IMAGECMD}; tune2fs -j 
${DEPLOY_DIR_IMAGE}/${IMAGE_NAME}.rootfs.ext3"
+IMAGE_CMD_ext3 = "genext2fs -b ${ROOTFS_SIZE} -d ${IMAGE_ROOTFS} ${DEPLOY_DIR_IMAGE}/${IMAGE_NAME}.rootfs.ext3 ${EXTRA_IMAGECMD}; tune2fs -j 
${DEPLOY_DIR_IMAGE}/${IMAGE_NAME}.rootfs.ext3"
 IMAGE_CMD_ext3.gz = "rm -rf ${DEPLOY_DIR_IMAGE}/tmp.gz && mkdir ${DEPLOY_DIR_IMAGE}/tmp.gz; genext2fs -b ${IMAGE_ROOTFS_SIZE} -d ${IMAGE_ROOTFS} 
${DEPLOY_DIR_IMAGE}/tmp.gz/${IMAGE_NAME}.rootfs.ext3 ${EXTRA_IMAGECMD}; tune2fs -j ${DEPLOY_DIR_IMAGE}/tmp.gz/${IMAGE_NAME}.rootfs.ext3; gzip -f -9 
${DEPLOY_DIR_IMAGE}/tmp.gz/${IMAGE_NAME}.rootfs.ext3; mv ${DEPLOY_DIR_IMAGE}/tmp.gz/${IMAGE_NAME}.rootfs.ext3.gz 
${DEPLOY_DIR_IMAGE}/${IMAGE_NAME}.rootfs.ext3.gz; rmdir ${DEPLOY_DIR_IMAGE}/tmp.gz"
 IMAGE_CMD_squashfs = "mksquashfs ${IMAGE_ROOTFS} ${DEPLOY_DIR_IMAGE}/${IMAGE_NAME}.rootfs.squashfs ${EXTRA_IMAGECMD} -noappend"
 IMAGE_CMD_squashfs-lzma = "mksquashfs-lzma ${IMAGE_ROOTFS} ${DEPLOY_DIR_IMAGE}/${IMAGE_NAME}.rootfs.squashfs-lzma ${EXTRA_IMAGECMD} -noappend"
 

Regards, 
-- 
JID:      hrw at jabber.org
Website:  http://blog.haerwu.biz/
LinkedIn: http://www.linkedin.com/in/marcinjuszkiewicz