tree b0270a3806d7f8f62559df25517ac41943e59a4a
parent 4c376814ce62b90afb4b31c729a4fe6a52091368
author Dan Pasanen <dan.pasanen@gmail.com> 1494451775 -0500
committer Michael Bestas <mkbestas@lineageos.org> 1661093986 +0300
gpgsig -----BEGIN PGP SIGNATURE-----
 
 iQJLBAABCgA1FiEEHrBYPudH862glXQBzJUERRm+ZmkFAmMCSGUXHG1rYmVzdGFz
 QGxpbmVhZ2Vvcy5vcmcACgkQzJUERRm+Zmlp9RAApl+7qkeuXD7e8TYZcf1NBcoo
 lz2G12WGkwU/ntdk9cmdRzfVGNw8TULC6WA+4hZjoto47PnBXNgZMzWucF8ukFTE
 jPhE64At4t+KI9GelNXBhoh8vGRFfS3SU9c1cNSNl8tUdPhR2hKUvRmYed5wFWI4
 ub7AgsappMdosYfE7lEEa1EpTLK571u5lt04uUiiw8250yQVTx+F6T+vib1r9NMs
 VXM8qns77V7CWPCwDfxAFI8yid8JuZ8ukcAjT62grFlPiJ6fdbgdVc9nmArMQlgC
 meaQuEEgKEehHLIh9qnQPffXufFWlhAeU4gppEqv0KPd8FDVDPx8hcy1C+4XvKwx
 xOB6cbAOG/vdSAm3eJsoPIXLWJ0fBLjes2xXX5Kmre7iO00gos9CtIIXYSTBqtKC
 bLHxxuiwOD2xY3JSfId1w57Rg1pl5HSSNXYeJ5EmxD8qqT4DvLfMl0C26Ru3XNxO
 EaFHauwpS9nnBuwe8a0fcZnvhXVSL2EyDR9Ifd71qqsfGvCx+YyVhXoDJeyhm9cw
 lFZzN9/G7LlbN5hK2V61tWgwYE+sLnZbbwh50ozM695HtNsnj/KYxaBhmedjVsBe
 S/IH3vB7xdLN8e76Had0aqbBNmuO7SmHIUuLJbiFm9EJ/xcq9OxwRxgdpVZXEnnf
 neQxVPuFl56fAaXLG7k=
 =owgf
 -----END PGP SIGNATURE-----

update_engine: Run backuptool script before normal postinstall script

* Check if the currently running /system has ever been mounted R/W.
  If it has, we can assume that running backuptool_ab scripts won't
  do anything catastrophic like break verity. Also this is a good
  indicator that the partition has been messed with since the initial
  installation of the rom (for instance if a gapps or su package had
  been added).

* Mount the new target slot's /system partition at /postinstall R/W,
  before the normal dex preopt script is run, and perform backuptool_ab
  operations. This will allow retaining addon packages, similar to what
  we've historically used in recovery flashes for non-A/B devices. This,
  since it mounts the new /system R/W, will also ensure it gets triggered
  again on the next flash.

* This assume that all backuptool operations are contained in /system
  and that we won't ever screw around with retaining things on /vendor.

Change-Id: I00ca479ccc24080bf3457334a6c9e4c07dd20f45