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HOW DOES UPDATE.ZIP WORK?

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Asked 10 years ago
Modified 2 months ago
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update.zips are packages containing replacements for parts of an Android system.
The packages contain all the files the update is intended to replace and a
script that will do the replacement when it's run.

update.zips can come from OTA updates, but in some cases, it is necessary to
manually download and put an update.zip in some special folder. However, the
update.zip is still detected and applied in the same manner.

What part of Android detects and handles update.zips?

 * updates

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edited Oct 5, 2023 at 16:23

Andrew T.♦
16k1010 gold badges7474 silver badges123123 bronze badges
asked Feb 21, 2014 at 19:52

Christian ChapmanChristian Chapman
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1
 * 2
   Congratulations: someone made update.zip redirect here.
   – user253751
   Jun 9, 2023 at 17:54

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update.zip are never touched by Android.

Inside that archive is a script that is parsed and interpreted by the Recovery
runtime.

The Recovery, at execution, opens the archive by unzipping into a temporary
directory, reads the script, aptly named update-script, analyzes it, and based
on the syntax, executes a function known to Recovery, that function may do the
following, to name but a few:

 * mount /system and other filesystems, and perform read/write file operations
   including, copying the kernel, or, an apk or even formatting a partition etc
 * check the build.prop for certain properties, such as device, manufacturer,
   etc
 * print display to the screen, progress information etc

It is pretty much a de-facto standard incorporated into Android Open Source
Project (AOSP)

ClockworkMod, TWRP are derivatives of the barebones version that resides in AOSP
with additional enhancements, such as touchscreen input.

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answered Feb 22, 2014 at 2:04

t0mm13bt0mm13b
13.4k11 gold badge4747 silver badges5858 bronze badges
4
 * +1 very interesting. So the recovery isn't part of android itself? What does
   it fall under? Part of Linux, a separate entity?
   – RossC
   Feb 22, 2014 at 9:38
 * 2
   @RossC The proper Recovery environment, resides on a separate /recovery
   partition (some manufacturers do not do this for some unknown reason, pseudo
   recovery) barebones limited Android, depending if stock recovery, limited
   shell vs CWM/TWRP which packs more, besides, root privileges. A real modder's
   delight is a device that has the separate partition for recovery.
   – t0mm13b
   Feb 22, 2014 at 13:44
 * 1
   /recovery doesn't look like a partition. In Linux that's just a directory. It
   could be a mounted partition - but it's still just a directory. I say this
   because it's a common misconception I've noticed in Android users.
   – jcora
   Feb 22, 2014 at 18:47
 * @yannbane - try this,cat /proc/mtd or look at /proc/partitions, its how the
   bootloader works, if vol dwn is pressed, bootloader reads kernel from
   /recovery and chain loads it bringing up either stock or custom recovery. It
   is not linux....
   – t0mm13b
   Feb 22, 2014 at 18:59

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