image_types.bbclass: manage 'cpio_append' directory

For cpio images, do_rootfs() can operate on a dirty '${WORKDIR}/cpio_append'
directory which contains e.g. files from previous builds.  This can cause
unwanted files in the image or can break the build.

E.g. when there is a cpio_append/init -> /sbin/init symlink symlink, the
'ln -sf' can fail due to SELinux restrictions:

| $ ls -la cpio_append/init
| lrwxrwxrwx. 1 ensc ensc 10 22. Jan 16:26 cpio_append/init -> /sbin/init
|
| $ strace ln -sf /sbin/init cpio_append/init
| ...
| stat("cpio_append/init", 0x7fffbb9ca310) = -1 EACCES (Permission denied)
| exit_group(1)                           = ?

Patch cleans up 'cpio_append' before executing the 'do_rootfs' task by
adding it to 'cleandirs'.  An alternative implementation (which avoids
creation of this empty dir for non-cpio images) might remove it within
IMAGE_CMD_cpio, but this might break builds where people rely on the
existence of this directory (e.g. to add local files).

(From OE-Core rev: 4db3cc2360289c062fa0df4678f2f2ef990f0c1a)

Signed-off-by: Enrico Scholz <enrico.scholz@sigma-chemnitz.de>
Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

1 files changed, 1 insertions, 1 deletions

diff --git a/meta/classes/image_types.bbclass b/meta/classes/image_types.bbclass
index 80a67bae47..0c27f298fc 100644
--- a/meta/classes/image_types.bbclass
+++ b/meta/classes/image_types.bbclass
@@ -68,10 +68,10 @@ IMAGE_CMD_squashfs-xz = "mksquashfs ${IMAGE_ROOTFS} ${DEPLOY_DIR_IMAGE}/${IMAGE_
 IMAGE_CMD_squashfs-lzo = "mksquashfs ${IMAGE_ROOTFS} ${DEPLOY_DIR_IMAGE}/${IMAGE_NAME}.rootfs.squashfs-lzo ${EXTRA_IMAGECMD} -noappend -comp lzo"
 IMAGE_CMD_tar = "tar -cvf ${DEPLOY_DIR_IMAGE}/${IMAGE_NAME}.rootfs.tar -C ${IMAGE_ROOTFS} ."
 
+do_rootfs[cleandirs] += "${WORKDIR}/cpio_append"
 IMAGE_CMD_cpio () {
         (cd ${IMAGE_ROOTFS} && find . | cpio -o -H newc >${DEPLOY_DIR_IMAGE}/${IMAGE_NAME}.rootfs.cpio)
         if [ ! -L ${IMAGE_ROOTFS}/init -a ! -e ${IMAGE_ROOTFS}/init ]; then
-                mkdir -p ${WORKDIR}/cpio_append
                 if [ -L ${IMAGE_ROOTFS}/sbin/init -o -e ${IMAGE_ROOTFS}/sbin/init ]; then
                         ln -sf /sbin/init ${WORKDIR}/cpio_append/init
                 else