[PATCH] lib/oe/rootfs: Fix DEBUGFS generation when using opkg

[Richard Purdie <richard.purdie@linuxfoundation.org>]

When enabling extra DEBUGFS image generation with opkg, errors are seen like:

ERROR: core-image-minimal-1.0-r0 do_rootfs: Cannot get the installed packages list. Command '/media/build1/poky/build/tmp/sysroots/x86_64-linux/usr/bin/opkg -f /media/build1/poky/build/tmp/work/qemux86_64-poky-linux/core-image-minimal/1.0-r0/opkg.conf -o /media/build1/poky/build/tmp/work/qemux86_64-poky-linux/core-image-minimal/1.0-r0/rootfs  --force_postinstall --prefer-arch-to-version   status' returned 0 and stderr:
Collected errors:
 * file_md5sum_alloc: Failed to open file /media/build1/poky/build/tmp/work/qemux86_64-poky-linux/core-image-minimal/1.0-r0/rootfs/etc/syslog-startup.conf.busybox: No such file or directory.
 * file_md5sum_alloc: Failed to open file /media/build1/poky/build/tmp/work/qemux86_64-poky-linux/core-image-minimal/1.0-r0/rootfs/etc/fstab: No such file or directory.

basically for all CONFFILES in the image. This is due to the file rearranging
the rootfs generation code does. If we preserve the /etc directory,
the avoids the problem.

We need to tell copyfile to preserve symlinks since some are present in /etc.

[YOCTO #9490]

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

diff --git a/meta/lib/oe/rootfs.py b/meta/lib/oe/rootfs.py
index a95e1b7..0546c1e 100644
--- a/meta/lib/oe/rootfs.py
+++ b/meta/lib/oe/rootfs.py
@@ -122,7 +122,7 @@ class Rootfs(object):
         bb.note("  Copying back package database...")
         for dir in dirs:
             bb.utils.mkdirhier(self.image_rootfs + os.path.dirname(dir))
-            shutil.copytree(self.image_rootfs + '-orig' + dir, self.image_rootfs + dir)
+            shutil.copytree(self.image_rootfs + '-orig' + dir, self.image_rootfs + dir, symlinks=True)
 
         cpath = oe.cachedpath.CachedPath()
         # Copy files located in /usr/lib/debug or /usr/src/debug
@@ -907,7 +907,7 @@ class OpkgRootfs(DpkgOpkgRootfs):
 
         self.pm.install_complementary()
 
-        self._setup_dbg_rootfs(['/var/lib/opkg'])
+        self._setup_dbg_rootfs(['/etc', '/var/lib/opkg'])
 
         execute_pre_post_process(self.d, opkg_post_process_cmds)