[gnome-continuous-yocto/gnomeostree-3.22-krogoth: 164/246] bitbake: lib/bb/checksum: avoid exception on broken symlinks

[Emmanuele Bassi <ebassi src gnome org>]

commit 95dae8b59854633aa66a9377c493a6bffcdf49a6
Author: Paul Eggleton <paul eggleton linux intel com>
Date:   Tue Jul 26 15:36:40 2016 +1200

    bitbake: lib/bb/checksum: avoid exception on broken symlinks
    
    If using OE's externalsrc with a source tree that is not tracked by git
    and contains broken symlinks, you can receive "TypeError: unorderable
    types: NoneType() < str()" within the file checksum code due to:
    
     checksums.sort(key=operator.itemgetter(1))
    
    Don't add files with no checksum to the checksums list in order to avoid
    this.
    
    (Bitbake rev: 484fe5a3f5b840e5422cbdff0eef9aecfe944a19)
    
    (Bitbake rev: c60f952a5adb1bcbab403779ce08927759bcfb63)
    
    Signed-off-by: Paul Eggleton <paul eggleton linux intel com>
    Signed-off-by: Richard Purdie <richard purdie linuxfoundation org>
    Signed-off-by: Armin Kuster <akuster808 gmail com>
    Signed-off-by: Richard Purdie <richard purdie linuxfoundation org>

 bitbake/lib/bb/checksum.py |    6 ++++--
 1 files changed, 4 insertions(+), 2 deletions(-)
---
diff --git a/bitbake/lib/bb/checksum.py b/bitbake/lib/bb/checksum.py
index 2ec964d..44cb4ac 100644
--- a/bitbake/lib/bb/checksum.py
+++ b/bitbake/lib/bb/checksum.py
@@ -127,13 +127,15 @@ class FileChecksumCache(MultiProcessCache):
                             checksums.extend(checksum_dir(f))
                     else:
                         checksum = checksum_file(f)
-                        checksums.append((f, checksum))
+                        if checksum:
+                            checksums.append((f, checksum))
             elif os.path.isdir(pth):
                 if not os.path.islink(pth):
                     checksums.extend(checksum_dir(pth))
             else:
                 checksum = checksum_file(pth)
-                checksums.append((pth, checksum))
+                if checksum:
+                    checksums.append((pth, checksum))
 
         checksums.sort(key=operator.itemgetter(1))
         return checksums