sparse_img.py: Don't write empty map groups.
In certain cases, we may have no mapping of ZERO or NONZERO blocks in
the image (such as squashfs at the moment). Don't write those groups if
they are empty.
Change-Id: I82aa05fbbd79130b08868585edd5298e531c4f5a
diff --git a/tools/releasetools/sparse_img.py b/tools/releasetools/sparse_img.py
index 49b3a67..7019f00 100644
--- a/tools/releasetools/sparse_img.py
+++ b/tools/releasetools/sparse_img.py
@@ -221,9 +221,14 @@
nonzero_blocks.append(b)
nonzero_blocks.append(b+1)
- out["__ZERO"] = rangelib.RangeSet(data=zero_blocks)
- out["__NONZERO"] = rangelib.RangeSet(data=nonzero_blocks)
- out["__COPY"] = clobbered_blocks
+ assert zero_blocks or nonzero_blocks or clobbered_blocks
+
+ if zero_blocks:
+ out["__ZERO"] = rangelib.RangeSet(data=zero_blocks)
+ if nonzero_blocks:
+ out["__NONZERO"] = rangelib.RangeSet(data=nonzero_blocks)
+ if clobbered_blocks:
+ out["__COPY"] = clobbered_blocks
def ResetFileMap(self):
"""Throw away the file map and treat the entire image as
