image.bbclass, kernel.bbclass: create warning file about deleting deploydir files

New users sometimes delete files in tmp/deploy/images assuming they will
be re-created just by re-running the build, and then are confused when
this doesn't work. To discourage people from doing this, create a file
called README_-_DO_NOT_DELETE_FILES_IN_THIS_DIRECTORY.txt in
tmp/deploy/images containing an explanation of what needs to be done to
re-create files there.

Fixes [YOCTO #1315] and [YOCTO #1346].

(From OE-Core rev: 4316c5e9eec67d71f4699102a63a5f968bd8d1d9)

Signed-off-by: Paul Eggleton <paul.eggleton@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

2 files changed, 4 insertions, 0 deletions

diff --git a/meta/classes/image.bbclass b/meta/classes/image.bbclass
index 54eb78b7c9..286ae013f9 100644
--- a/meta/classes/image.bbclass
+++ b/meta/classes/image.bbclass
@@ -138,6 +138,8 @@ fakeroot do_rootfs () {
         mkdir -p ${IMAGE_ROOTFS}
         mkdir -p ${DEPLOY_DIR_IMAGE}
 
+        cp -n ${COREBASE}/meta/files/deploydir_readme.txt ${DEPLOY_DIR_IMAGE}/README_-_DO_NOT_DELETE_FILES_IN_THIS_DIRECTORY.txt
+
         if [ "${USE_DEVFS}" != "1" ]; then
                 for devtable in ${@get_devtable_list(d)}; do
                         makedevs -r ${IMAGE_ROOTFS} -D $devtable
diff --git a/meta/classes/kernel.bbclass b/meta/classes/kernel.bbclass
index 386b05e57a..a2b10f2c7a 100644
--- a/meta/classes/kernel.bbclass
+++ b/meta/classes/kernel.bbclass
@@ -500,6 +500,8 @@ kernel_do_deploy() {
         cd ${DEPLOYDIR}
         rm -f ${KERNEL_IMAGE_SYMLINK_NAME}.bin
         ln -sf ${KERNEL_IMAGE_BASE_NAME}.bin ${KERNEL_IMAGE_SYMLINK_NAME}.bin
+
+        cp -n ${COREBASE}/meta/files/deploydir_readme.txt ${DEPLOYDIR}/README_-_DO_NOT_DELETE_FILES_IN_THIS_DIRECTORY.txt
 }
 do_deploy[dirs] = "${DEPLOYDIR} ${B}"