[oe-commits] [openembedded-core] 05/86: image: add image-combined-dbg helper class

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rpurdie pushed a commit to branch master-next
in repository openembedded-core.

commit 7ccb077f51c9232de70e5c6f9897fd9986e3be9d
Author: Victor Kamensky <kamensky at cisco.com>
AuthorDate: Thu Apr 5 11:25:26 2018 -0700

    image: add image-combined-dbg helper class
    
    There is IMAGE_GEN_DEBUGFS="1" variable that enables build of
    additional rootfs-dbg and additional archive that contains
    complimentary symbols files for a given image. But the issue
    with this resulting directory and tarball that before use it
    has to be combined with original image content. It is required
    since all cross debugging tools like gdb, perf, and systemtap
    need file system that contains both target executables/libraries
    and their symbols. Those tools need to find executable/library
    first and through it debuglink note find corresponding symbols
    file.
    
    image-combined-dbg when added to USER_CLASSES just copies
    final resulting rootfs back into rootfs-dbg creating combined
    target and debug symbols rootfs that can be used for debugging
    directly.
    
    Signed-off-by: Victor Kamensky <kamensky at cisco.com>
    Signed-off-by: Richard Purdie <richard.purdie at linuxfoundation.org>
---
 meta/classes/image-combined-dbg.bbclass | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/meta/classes/image-combined-dbg.bbclass b/meta/classes/image-combined-dbg.bbclass
new file mode 100644
index 0000000..f4772f7
--- /dev/null
+++ b/meta/classes/image-combined-dbg.bbclass
@@ -0,0 +1,9 @@
+IMAGE_PREPROCESS_COMMAND_append = " combine_dbg_image; "
+
+combine_dbg_image () {
+        if [ "${IMAGE_GEN_DEBUGFS}" = "1" -a -e ${IMAGE_ROOTFS}-dbg ]; then
+                # copy target files into -dbg rootfs, so it can be used for
+                # debug purposes directly
+                tar -C ${IMAGE_ROOTFS} -cf - . | tar -C ${IMAGE_ROOTFS}-dbg -xf -
+        fi
+}

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