backuptool: introduce addon.d script versioning
* Since A/B addon.d scripts are going to need to do things in a
specific way or things could go horribly wrong for a user, let's
introduce versioning so that scripts can claim to be compatible.
* A script can denote it is compatible with addon.d version 2 by
adding: "# ADDOND_VERSION=2" somewhere in its script.
* Only A/B will require version 2 scripts for now, and version 2
scripts will still run on non-A/B. Additionally if a script does
not explicitly denote its version, assume its version 1.
* Version 1: The same old scripts we've always used. We cannot assume
these will all work with A/B backuptools.
* Version 2: Scripts that denote they are compatible with version 2
must be aware of the fact that A/B devices will run this
script for a rom, during a seamless update, mounted at
/postinstall. The best way to ensure compatibility would
be to use the pre-designated functions found in the
backuptool[,_ab].functions scripts.
Change-Id: I5573018dabd21bb64c7c964e2081806072a75243
diff --git a/prebuilt/common/bin/backuptool_ab.sh b/prebuilt/common/bin/backuptool_ab.sh
index 00f5da0..8c5e7f6 100755
--- a/prebuilt/common/bin/backuptool_ab.sh
+++ b/prebuilt/common/bin/backuptool_ab.sh
@@ -7,6 +7,8 @@
export C=/postinstall/tmp/backupdir
export V=8.1
+export ADDOND_VERSION=2
+
# Scripts in /system/addon.d expect to find backuptool.functions in /tmp
mkdir -p /postinstall/tmp/
cp -f /postinstall/system/bin/backuptool_ab.functions /postinstall/tmp/backuptool.functions
@@ -16,6 +18,18 @@
if [ -d /system/addon.d/ ]; then
mkdir -p /postinstall/tmp/addon.d/
cp -a /system/addon.d/* /postinstall/tmp/addon.d/
+
+ # Discard any scripts that aren't at least our version level
+ for f in /postinstall/tmp/addon.d/*sh; do
+ SCRIPT_VERSION=$(grep "^# ADDOND_VERSION=" $f | cut -d= -f2)
+ if [ -z "$SCRIPT_VERSION" ]; then
+ SCRIPT_VERSION=1
+ fi
+ if [ $SCRIPT_VERSION -lt $ADDOND_VERSION ]; then
+ rm $f
+ fi
+ done
+
chmod 755 /postinstall/tmp/addon.d/*.sh
fi
}