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image/image_types.bbclass: fix fatal error during cpio debugfs creation 

If /init is just a symlink to /sbin/init, debugfs creation
fails with the following error:

ERROR: Error: The image creation script '<...>/debugfs.create_image.cpio' returned 1:
touch: cannot touch '<...>/cpio_append/init': Permission denied
WARNING: exit code 1 from a shell command.

ERROR: Function failed: do_rootfs

The reason is that IMAGE_CMD_cpio() is run twice on the same
WORKDIR. The first run creates a symlink in WORKDIR/cpio_append/init
to point to /sbin/init, while the 2nd run then tries to 'touch'
that link, which will fail, of course since /sbin/init is not
usually writable by non-root users.

Fix this by providing knowledge to the IMAGE_CMD_xxx() scripts
with regards to the fact that they are being executed in the
context of debugfs creation. The IMAGE_CMD_cpio() can now be
intelligent in the sense that it can avoid all additional symlink
handling during the debugfs run. The symlinks do not need to
be part of the debugfs, so we can skip that part altogether
in that case.

(From OE-Core rev: 659ae1d7df28115429f6f31450fad6d1f86e3031)

Signed-off-by: André Draszik <adraszik@tycoint.com>
Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
This commit is contained in:
André Draszik 2016-06-10 16:11:38 +01:00 committed by Richard Purdie
parent 3332061f69
commit 9ac4c8b11c
2 changed files with 14 additions and 6 deletions
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1
meta/classes/image.bbclass
View File

@ -287,6 +287,7 @@ def setup_debugfs_variables(d):
d.appendVar('IMAGE_ROOTFS', '-dbg')
d.appendVar('IMAGE_LINK_NAME', '-dbg')
d.appendVar('IMAGE_NAME','-dbg')
d.setVar('IMAGE_BUILDING_DEBUGFS', 'true')
debugfs_image_fstypes = d.getVar('IMAGE_FSTYPES_DEBUGFS', True)
if debugfs_image_fstypes:
d.setVar('IMAGE_FSTYPES', debugfs_image_fstypes)

19
meta/classes/image_types.bbclass
View File

@ -101,13 +101,20 @@ IMAGE_CMD_tar = "${IMAGE_CMD_TAR} -cvf ${DEPLOY_DIR_IMAGE}/${IMAGE_NAME}${IMAGE_
do_image_cpio[cleandirs] += "${WORKDIR}/cpio_append"
IMAGE_CMD_cpio () {
(cd ${IMAGE_ROOTFS} && find . | cpio -o -H newc >${DEPLOY_DIR_IMAGE}/${IMAGE_NAME}${IMAGE_NAME_SUFFIX}.cpio)
if [ ! -L ${IMAGE_ROOTFS}/init -a ! -e ${IMAGE_ROOTFS}/init ]; then
if [ -L ${IMAGE_ROOTFS}/sbin/init -o -e ${IMAGE_ROOTFS}/sbin/init ]; then
ln -sf /sbin/init ${WORKDIR}/cpio_append/init
else
touch ${WORKDIR}/cpio_append/init
# We only need the /init symlink if we're building the real
# image. The -dbg image doesn't need it! By being clever
# about this we also avoid 'touch' below failing, as it
# might be trying to touch /sbin/init on the host since both
# the normal and the -dbg image share the same WORKDIR
if [ "${IMAGE_BUILDING_DEBUGFS}" != "true" ]; then
if [ ! -L ${IMAGE_ROOTFS}/init ] && [ ! -e ${IMAGE_ROOTFS}/init ]; then
if [ -L ${IMAGE_ROOTFS}/sbin/init ] || [ -e ${IMAGE_ROOTFS}/sbin/init ]; then
ln -sf /sbin/init ${WORKDIR}/cpio_append/init
else
touch ${WORKDIR}/cpio_append/init
fi
(cd ${WORKDIR}/cpio_append && echo ./init | cpio -oA -H newc -F ${DEPLOY_DIR_IMAGE}/${IMAGE_NAME}${IMAGE_NAME_SUFFIX}.cpio)
fi
(cd ${WORKDIR}/cpio_append && echo ./init | cpio -oA -H newc -F ${DEPLOY_DIR_IMAGE}/${IMAGE_NAME}${IMAGE_NAME_SUFFIX}.cpio)
fi
}