Android Fota(差分包)制作

Android Fota包制作

Fota包生成步骤
问题

Fota包生成步骤

在Android系统编译(make)完成后，执行 make otapackage即可生成制作差分包所需的target package。
target包路径：android/out/target/product/msm_xxxx/target_files-package.zip
解压target_files-package.zip后，会看到一个ota_target_files.zip，这是制作Fota包需要的ota包。

Fota包是利用base版本（刷在手机中版本）ota_target_files.zip和目标版本的ota_target_files.zip进行制作的。
将base版本的ota_target_files.zip重命名为base.zip，目标版本的ota_target_files.zip重命名为target.zip，将base.zip复制到目标版本target_files-package.zip的解压目录，然后在该目录下执行Fota生成命令。

Fota生成命令：
使用testkey签名Fota包：
./build/tools/releasetools/ota_from_target_files -v --block -p out/host/linux-x86 -k build/target/product/security/testkey -i base.zip target.zip update.zip
使用releasekey签名Fota包：
./build/tools/releasetools/ota_from_target_files -v --block -p out/host/linux-x86 -k build/target/product/security/releasekey -i base.zip target.zip update.zip

对update包重新签名：
java -Xmx2048m -Djava.library.path=out/host/linux-x86/lib64 -jar out/host/linux-x86/framework/signapk.jar -w build/target/product/security/releasekey.x509.pem build/target/product/security/releasekey.pk8 update.zip update1.zip
Note：不同平台Fota包的生成命令可能存在差异。

问题

在Fota的生成过程中，我遇到过如下问题：
错误log：

Exception in thread Thread-1:
Traceback (most recent call last):File "/usr/lib/python2.7/threading.py", line 801, in __bootstrap_innerself.run()File "/usr/lib/python2.7/threading.py", line 754, in runself.__target(*self.__args, **self.__kwargs)File "/home/huangxiaobin/fota/0112/build/tools/releasetools/blockimgdiff.py", line 1535, in SplitLargeApkssrc_name, tgt_name, imgdiff_output)
AssertionError: Failed to create imgdiff patch between //system/app/FactoryTest/FactoryTest.apk and //system/app/FactoryTest/FactoryTest.apk:
W/ziparchive(350584): Zip: bad offsets (dir 16961536, size 18126, eocd 16176846)
imgdiff E 04-20 11:49:38 350584 350584 imgdiff.cpp:661] Failed to open zip file /tmp/src-AyMOMQ: Invalid offset

log提示在对FactoryTest.apk制作差分的时候出错了，疑似system.map不匹配导致的（可能是集成应用所用方法不完善）。

解决方案：
FactoryTest.apk无法制作差分，对该apk进行整体升级。
修改build/make/tools/releasetools/blockimgdiff.py脚本。

diff --git a/build/make/tools/releasetools/blockimgdiff.py b/build/make/tools/releasetools/blockimgdiff.py
--- a/build/make/tools/releasetools/blockimgdiff.py
+++ b/build/make/tools/releasetools/blockimgdiff.py
@@ -192,6 +192,27 @@ class Transfer(object):self.src_sha1 = src_sha1self.style = style+    if tgt_name == "//system/app/FactoryTest/FactoryTest.apk":
+        self.style = "new"
+    #如果多个应用报错，按照相同方式可以添加多个apk
+ # We use OrderedDict rather than dict so that the output is repeatable;# otherwise it would depend on the hash values of the Transfer objects.self.goes_before = OrderedDict()
@@ -220,7 +241,7 @@ class Transfer(object):sum(sr.size() for (_, sr) in self.use_stash))def ConvertToNew(self):
-    assert self.style != "new"
+    #assert self.style != "new"self.use_stash = []self.style = "new"self.src_ranges = RangeSet()
@@ -1357,11 +1378,11 @@ class BlockImageDiff(object):# Split large APKs with imgdiff, if possible. We're intentionally checking# file types one more time (CanUseImgdiff() checks that as well), before# calling the costly RangeSha1()s.
-      if (self.FileTypeSupportedByImgdiff(tgt_name) and
-          self.tgt.RangeSha1(tgt_ranges) != self.src.RangeSha1(src_ranges)):
-        if self.CanUseImgdiff(tgt_name, tgt_ranges, src_ranges, True):
-          large_apks.append((tgt_name, src_name, tgt_ranges, src_ranges))
-          return
+      #if (self.FileTypeSupportedByImgdiff(tgt_name) and
+      #    self.tgt.RangeSha1(tgt_ranges) != self.src.RangeSha1(src_ranges)):
+      #  if self.CanUseImgdiff(tgt_name, tgt_ranges, src_ranges, True):
+      #    large_apks.append((tgt_name, src_name, tgt_ranges, src_ranges))
+      #    returnAddSplitTransfersWithFixedSizeChunks(tgt_name, src_name, tgt_ranges,src_ranges, style, by_id)