tree 3d1ee0b59b604f785a6315d2070eb3eb2c7dde64
parent 85dd84e3ee6f47ea32f9eba0cd9baef5a8dbfc04
author Alessandro Astone <ales.astone@gmail.com> 1609263508 +0100
committer Jackeagle <jackeagle102@gmail.com> 1615971861 +0100

backuptool: Support seamless backup and restore to extra partitions

For scripts declaring ADDOND_VERSION=3 automatically mount
vendor, product, system_ext and others (when they're dedicated partitions).

Also expose the get_output_path() function to get the path to where
a file is mounted in case it lives in a dedicated partition.

ab exapmles:
get_output_path "system/product/priv-app/MyApp.apk"  = "/postinstall/product/priv-app/MyApk.apk"
get_output_path "system/app/MySystemApp.apk"         = "/postinstall/system/app/MySystemApp.apk"

a-only examples:
get_output_path "/mnt/system/system/product/priv-app/MyApp.apk" = "/mnt/system/system/product/priv-app/MyApp.apk"

******************************************************************
Instead of cycling all scripts for each stage, run
pre-backup -> backup -> post-backup in quick succession
(and likewise for restore), to ensure backwards compatibility
with scripts that wrongly assumed their environment not to
change between steps.
This is needed because we want to undo any mounting done for V3
scripts when executing V2 scripts. If a V2 script did mounting in
pre-restore and expected things to still be mounted in restore,
we would break their (yes incorrect) assumption.

Change-Id: I73fbad6f45824fed99e4482128769435348588f5