如何在模拟器/设备中为应用程序打补丁，类似于Google Play通过“智能应用程序更新”进行的操作？ [英] How to patch an application in emulator/device similar to how Google Play is doing with "Smart app updates"?

问题描述

是否可以在本地（使用 adb 或其他方式）实现Google Play在智能应用更新中的功能？

Is it possible to achieve locally (using adb or other ways) what Google Play is doing in "Smart app updates" ?

我想做的是在PC上创建一个二进制diff（使用某些命令行工具），然后使用Android工具（adb，shell等）将该差异部署到模拟器/设备。

What I want to do is to create a binary diff on the PC (using some command line tools) and then deploy the diff to simulator/device using Android tools (adb, shell, etc).

我知道
https://android.stackexchange.com/questions/36421/what-is-the-applypatch-tool-and-how-does-one-use-it
，它不提供有关如何实际创建和应用补丁的任何信息，只是 adb shell applypatch 是什么。

我试图在此处快速进行修补的C ++ Android实现代码： https://android.googlesource.com/platform/bootable /recovery/+/master/applypatch/main.cpp#167

I tried to take a quick look at the C++ Android implementation code here which does the patching: https://android.googlesource.com/platform/bootable/recovery/+/master/applypatch/main.cpp#167

到目前为止，我使用bsdiff创建了一个二进制diff，显然它使用与Google Play和Android正在使用。但是我不知道该如何实际应用补丁。

So far I created a binary diff using bsdiff, which apparently uses same algorithm with what Google Play and Android is using. But I don't know how to actually apply the patch.

编辑：为澄清起见，这是一个很好的例子：

EDIT: To clarify, here's a good example:

• 我的PC上有 com.appv1.apk ，并且还安装在设备/仿真器上。 / li>
  
• 我的PC上有 com.appv2.apk 。


• 使用 bsdiff 我在 com.appv1.apk 和 com.appv2.apk 叫做 diff.bin



• I have com.appv1.apk on my PC and also installed on the device/emulator.
• I have com.appv2.apk on my PC.
• Using bsdiff I create the binary diff between com.appv1.apk and com.appv2.apk called let's say diff.bin

现在，什么是实际的 adb 命令，我需要运行将 diff.bin 部署在设备/仿真器上，以便在部署diff后，设备/仿真器上的 com.appv1.apk 变为 com.appv2.apk ？

Now, what is the actual adb command I need to run to deploy diff.binon the device/emulator such that after deploying the diff, com.appv1.apk on the device/emulator becomes com.appv2.apk ?

推荐答案

我会说在用法之间打印：

usage: applypatch [-b <bonus-file>] <src-file> <tgt-file> <tgt-sha1> <tgt-size> [<src-sha1>:<patch> ...]
   or  applypatch -c <file> [<sha1> ...]
   or  applypatch -s <bytes>
   or  applypatch -l

Filenames may be of the form
  MTD:<partition>:<len_1>:<sha1_1>:<len_2>:<sha1_2>:...
to specify reading from or writing to an MTD partition.

以及以下注释：

// This program applies binary patches to files in a way that is safe
// (the original file is not touched until we have the desired
// replacement for it) and idempotent (it's okay to run this program
// multiple times).
//
// - if the sha1 hash of <tgt-file> is <tgt-sha1>, does nothing and exits
//   successfully.
//
// - otherwise, if no <src-sha1>:<patch> is provided, flashes <tgt-file> with
//   <src-file>. <tgt-file> must be a partition name, while <src-file> must
//   be a regular image file. <src-file> will not be deleted on success.
//
// - otherwise, if the sha1 hash of <src-file> is <src-sha1>, applies the
//   bsdiff <patch> to <src-file> to produce a new file (the type of patch
//   is automatically detected from the file header).  If that new
//   file has sha1 hash <tgt-sha1>, moves it to replace <tgt-file>, and
//   exits successfully.  Note that if <src-file> and <tgt-file> are
//   not the same, <src-file> is NOT deleted on success.  <tgt-file>
//   may be the string "-" to mean "the same as src-file".
//
// - otherwise, or if any error is encountered, exits with non-zero
//   status.
//
// <src-file> (or <file> in check mode) may refer to an EMMC partition
// to read the source data.  See the comments for the
// LoadPartitionContents() function for the format of such a filename.

这很简单。

因此，使用 diff.bin <修补 com.appv1.apk 的基本命令/ code>并将结果保存到 com.appv2.apk 将是：

So the basic command to patch com.appv1.apk with diff.bin and save the result to the com.appv2.apk would be:

applypatch com.appv1.apk com.appv2.apk <com.appv2.apk SHA1> <com.appv2.apk size> <com.appv1.apk SHA1>:diff.bin

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