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releasetools: Always write the last block if it's padded.

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In BBOTAs if the last block of a DataImage is padded, we should always
write the whole block even for incremental OTAs. Because otherwise the
last block may be skipped if unchanged, but would fail the post-install
verification if it has non-zero contents in the padding bytes.

Bug: 23828506
Change-Id: I4b0af7344d18261258cd48d18c029c089d6ff365
This commit is contained in:
Tao Bao 2015-09-05 20:35:32 -07:00
parent 762746705c
commit 7589e961a7
1 changed files with 21 additions and 6 deletions
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27
tools/releasetools/blockimgdiff.py
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@ -106,11 +106,13 @@ class DataImage(Image):
assert not (trim and pad)
partial = len(self.data) % self.blocksize
padded = False
if partial > 0:
if trim:
self.data = self.data[:-partial]
elif pad:
self.data += '\0' * (self.blocksize - partial)
padded = True
else:
raise ValueError(("data for DataImage must be multiple of %d bytes "
"unless trim or pad is specified") %
@ -120,14 +122,23 @@ class DataImage(Image):
self.total_blocks = len(self.data) / self.blocksize
self.care_map = RangeSet(data=(0, self.total_blocks))
self.clobbered_blocks = RangeSet()
# When the last block is padded, we always write the whole block even for
# incremental OTAs. Because otherwise the last block may get skipped if
# unchanged for an incremental, but would fail the post-install
# verification if it has non-zero contents in the padding bytes.
# Bug: 23828506
if padded:
self.clobbered_blocks = RangeSet(
data=(self.total_blocks-1, self.total_blocks))
else:
self.clobbered_blocks = RangeSet()
self.extended = RangeSet()
zero_blocks = []
nonzero_blocks = []
reference = '\0' * self.blocksize
for i in range(self.total_blocks):
for i in range(self.total_blocks-1 if padded else self.total_blocks):
d = self.data[i*self.blocksize : (i+1)*self.blocksize]
if d == reference:
zero_blocks.append(i)
@ -139,14 +150,18 @@ class DataImage(Image):
self.file_map = {"__ZERO": RangeSet(zero_blocks),
"__NONZERO": RangeSet(nonzero_blocks)}
if self.clobbered_blocks:
self.file_map["__COPY"] = self.clobbered_blocks
def ReadRangeSet(self, ranges):
return [self.data[s*self.blocksize:e*self.blocksize] for (s, e) in ranges]
def TotalSha1(self, include_clobbered_blocks=False):
# DataImage always carries empty clobbered_blocks, so
# include_clobbered_blocks can be ignored.
assert self.clobbered_blocks.size() == 0
return sha1(self.data).hexdigest()
if not include_clobbered_blocks:
ranges = self.care_map.subtract(self.clobbered_blocks)
return sha1(self.ReadRangeSet(ranges)).hexdigest()
else:
return sha1(self.data).hexdigest()
class Transfer(object):