i've come to the insight that the tool "genext2fs"
does a very limited job in respect to what i would
consider current file system standards.
it does what its name says: generating an ext2 file system.
it does _not_:
- generate an UUID
- set the revision level to >0 (that might indicate an ext3 file system)
- set the members that come with a revision >0
if later on a "tune2fs -j" is applied to such an ext2 file system (as specified
by OE bitbake.conf)
then a journal is created making it effectively an ext3 file system.
this step does _not_:
- generate an UUID
- set the revision level to >0 (that might indicate an ext3 file system)
- set the members that come with a revision >0
this might or might not be correct in terms of the tool.
with my limited knowledge level=0 might not be allowed to receive a journal -
or alternatively when the journal is added the level value and members should
see an update.
my short term choice was the addition of "e2fschk -y <image>" to my local
version of the OE bitbake.conf file. (see patch below. Note: that my local file
is not a current version, ext4 and misc packer formats are missing but you
should be able to get the clue on the subject.)
this step _does_:
- generate an UUID
- set the revision level to >0 (that might indicate an ext3 file system)
- set the members that come with a revision >0
as a result i get sane, checked and thus most probably working file system
image. any later fs check on the image will either succeed or fail depending on
what changes the file system has seen since its creation.
if that step is not applied i would never be able to automatically verify the
file system since it had errors inside at already its release time.
regards, Alex.
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--- bitbake.conf.orig 2011-07-22 15:56:09.000000000 +0200
+++ bitbake.conf 2011-07-22 15:55:18.000000000 +0200
@@ -330,8 +330,8 @@
IMAGE_CMD_cramfs = "mkcramfs ${IMAGE_ROOTFS} ${DEPLOY_DIR_IMAGE}/${IMAGE_NAME}.rootfs.cramfs ${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 ${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_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; e2fsck -y ${DEPLOY_DIR_IMAGE}/${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; e2fsck -y ${DEPLOY_DIR_IMAGE}/tmp.gz/${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"
IMAGE_CMD_tar = "cd ${IMAGE_ROOTFS} && tar -cvf ${DEPLOY_DIR_IMAGE}/${IMAGE_NAME}.rootfs.tar ."
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