[OE-core] [PATCH] wic/filemap: handle FIGETBSZ failing

[Ross Burton]

Some file systems don't support fetching the block size (notably the file system
Docker uses for containers), so handle the iotctl() failing and raise the
expected error.

Signed-off-by: Ross Burton <ross.burton at intel.com>
---
 scripts/lib/wic/filemap.py | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/scripts/lib/wic/filemap.py b/scripts/lib/wic/filemap.py
index 244c07a71cf..a3919fbcad8 100644
--- a/scripts/lib/wic/filemap.py
+++ b/scripts/lib/wic/filemap.py
@@ -32,7 +32,10 @@ def get_block_size(file_obj):
     """
     # Get the block size of the host file-system for the image file by calling
     # the FIGETBSZ ioctl (number 2).
-    binary_data = fcntl.ioctl(file_obj, 2, struct.pack('I', 0))
+    try:
+        binary_data = fcntl.ioctl(file_obj, 2, struct.pack('I', 0))
+    except OSError:
+        raise IOError("Unable to determine block size")
     bsize = struct.unpack('I', binary_data)[0]
     if not bsize:
         import os
-- 
2.11.0