Add a function that allows to copy files preserving their SELinux
context that is generic enough to work with both busybox and toybox.
Change-Id: If2c245863df5675c18dbf43b6bcedeb33383fc38
We should not test symlinks using -e or -f, otherwise the order in
which the files are backed up and restored matters.
Change-Id: I9b87972b27a63ef562c0c5f46f943eafd0a08ce1
Tips & Tricks
=============
* 50-cm.sh contains only a reference implementation. You may customize the methods however you wish.
For example, 20-foobar.sh pre-backup can use a loop with conditionals to generate a dynamic backup list in
/tmp/foobar_file_list which is later printed by list_files() so the backup method will act on those files.
* Optional methods pre-backup, post-backup, pre-restore, or post-restore may be defined for special purposes.
* Inject new files into /tmp/addon.d/ prior to backuptool.sh backup if you want to act during the current CM upgrade.
* Delete files from /tmp/addon.d/ during post-restore if you want to permanently remove files from /system/addon.d/
Addons may use this approach to run a script only once.
* Scripts run in sort -n order. Prefix with numbers 00 through 99 if want to run in a particular order.
* You can have two separate scripts, implementing only backup in one, and only restore in the other with a different
number prefix of each. This allows even greater control the backup/restore order even further.
* You could use pre-backup to generate a one-time use backup script in /tmp/addon.d/ that deletes itself in
post-restore.
Patch Series
============
http://review.cyanogenmod.com/#change,13265
CyanogenMod/android_build
* edify generator
http://review.cyanogenmod.com/#change,13266
CyanogenMod/android_system_core
* permissions on /system/addon.d
http://review.cyanogenmod.com/#change,13267
CyanogenMod/android_vendor_cm
* 50-cm.sh reference backup script
* modular backuptool.sh
* support backuptool.functions used by /system/addon.d/*.sh scripts
Change-Id: Ifd5eaf9dcfd68d92e5043c21d1bae1dc0ad54860
