Android OTA 增量升级失败的问题

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博客围绕安卓增量升级失败问题展开。通过查看日志和脚本，发现是升级前后 syste/etc/recovery-resource.dat 文件的 sha1 校验码检查失败。原因是首次烧录软件只全编未 make otapackage，而增量包 base.zip 经过该操作。解决办法是给客户的软件要全编并 make otapackage。

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问题描述

增量升级失败，查看log

cat /cache/recovery/last_log

Installing update...
Verifying current system...file "/system/etc/recovery-resource.dat" doesn't have any of expected sha1 sums; checking cache
failed to stat "/cache/saved.file": No such file or directory
failed to load cache file
script aborted: "/system/etc/recovery-resource.dat" has unexpected contents.

"/system/etc/recovery-resource.dat" has unexpected contents.
E:Error in /mnt/media_rw/udisk/lierda_update.zip
(Status 7)
Installation aborted.

查看 update\META-INF\com\google\android\updater-script

apply_patch_check("/system/etc/recovery-resource.dat", "1074e1187579a9b7113486f2d78e18b5f7c033af", "b55e605cbf5b6500016ca108f2a1069078a6689c") || abort("\"/system/etc/recovery-resource.dat\" has unexpected contents.");

发现是检查由升级前后的 syste/etc/recovery-resource.dat 文件的sha1 校验码失败