[PATCH 2/2] isoimage-isohybrid-isar: fix disk full if no initrd exists

["'Quirin Gylstorff' via isar-users" <isar-users@googlegroups.com>]

From: Quirin Gylstorff <quirin.gylstorff@siemens.com>

If no initrd was generated during the rootfs build the wic plugin
uses the existing rootfs as initrd. The plugin uses shutil.copytree
to copy the rootfs to a new folder. As the rootfs contains `/dev/full`
this will fill the disk until it is full.

To avoid this error ignore all files in `/dev/` of the rootfs.

Tested-by:    Herbert Bernecker <herbert.bernecker@siemens.com>
Signed-off-by: Quirin Gylstorff <quirin.gylstorff@siemens.com>
---
 .../lib/wic/plugins/source/isoimage-isohybrid-isar.py     | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/meta/scripts/lib/wic/plugins/source/isoimage-isohybrid-isar.py b/meta/scripts/lib/wic/plugins/source/isoimage-isohybrid-isar.py
index 690e291e..fb6c6b39 100644
--- a/meta/scripts/lib/wic/plugins/source/isoimage-isohybrid-isar.py
+++ b/meta/scripts/lib/wic/plugins/source/isoimage-isohybrid-isar.py
@@ -203,8 +203,14 @@ class IsoImagePlugin(SourcePlugin):
             # Create initrd from rootfs directory
             initrd = "%s/initrd.cpio.gz" % cr_workdir
             initrd_dir = "%s/INITRD" % cr_workdir
+            def ignore_contents(src, names):
+                if os.path.basename(src) == 'dev':
+                    return names
+                return []
+
             shutil.copytree("%s" % rootfs_dir, \
-                            "%s" % initrd_dir, symlinks=True)
+                            "%s" % initrd_dir, \
+                            ignore=ignore_contents, symlinks=True)
 
             if os.path.isfile("%s/init" % rootfs_dir):
                 shutil.copy2("%s/init" % rootfs_dir, "%s/init" % initrd_dir)
-- 
2.51.2

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