是否有可能在本地(使用adb
或其他方式)实现Google Play在“智能应用更新”中所做的工作?
我想要做的是在PC上创建二进制差异(使用一些命令行工具),然后使用Android工具(adb,shell等)将差异部署到模拟器/设备。
我知道
https://android.stackexchange.com/questions/36421/what-is-the-applypatch-tool-and-how-does-one-use-it
它没有提供关于如何实际创建和应用补丁的任何信息,只是adb shell applypatch
是什么。
我试着快速浏览一下修补程序中的C ++ Android实现代码:https://android.googlesource.com/platform/bootable/recovery/+/master/applypatch/main.cpp#167
到目前为止,我使用bsdiff创建了一个二元差异,它显然使用与Google Play和Android正在使用的算法相同的算法。但我不知道如何实际应用补丁。
编辑:澄清一下,这是一个很好的例子:
com.appv1.apk
,并且还安装在设备/模拟器上。com.appv2.apk
。bsdiff
我在com.appv1.apk
和com.appv2.apk
之间创建二进制差异,称为diff.bin
现在,我需要在设备/模拟器上运行以部署adb
的实际diff.bin
命令是什么,以便在部署差异后,设备/模拟器上的com.appv1.apk
变为{ {1}}?
答案 0 :(得分:1)
我会说在用法之间打印出来:
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.
以及以下评论:
// 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.
非常简单。
因此,使用com.appv1.apk
修补diff.bin
并将结果保存到com.appv2.apk
的基本命令是:
applypatch com.appv1.apk com.appv2.apk <com.appv2.apk SHA1> <com.appv2.apk size> <com.appv1.apk SHA1>:diff.bin