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|
#!/system/bin/sh
#
# Backup and restore addon /system files
#
export S=/system
export C=/postinstall/tmp/backupdir
export V=16.0
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
# Preserve /system/addon.d in /tmp/addon.d
preserve_addon_d() {
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 $f
fi
done
chmod 755 /postinstall/tmp/addon.d/*.sh
fi
}
# Restore /postinstall/system/addon.d from /postinstall/tmp/addon.d
restore_addon_d() {
if [ -d /postinstall/tmp/addon.d/ ]; then
mkdir -p /postinstall/system/addon.d/
cp -a /postinstall/tmp/addon.d/* /postinstall/system/addon.d/
rm -rf /postinstall/tmp/addon.d/
fi
}
# Proceed only if /system is the expected major and minor version
check_prereq() {
# If there is no build.prop file the partition is probably empty.
if [ ! -r /system/build.prop ]; then
return 0
fi
grep -q "^ro.lineage.version=$V.*" /system/build.prop && return 1
echo "Not backing up files from incompatible version: $V"
return 0
}
check_blacklist() {
if [ -f /system/addon.d/blacklist -a -d /$1/addon.d/ ]; then
## Discard any known bad backup scripts
cd /$1/addon.d/
for f in *sh; do
[ -f $f ] || continue
s=$(md5sum $f | cut -c-32)
grep -q $s /system/addon.d/blacklist && rm -f $f
done
fi
}
check_whitelist() {
found=0
if [ -f /system/addon.d/whitelist ];then
## forcefully keep any version-independent stuff
cd /$1/addon.d/
for f in *sh; do
s=$(md5sum $f | cut -c-32)
grep -q $s /system/addon.d/whitelist
if [ $? -eq 0 ]; then
found=1
else
rm -f $f
fi
done
fi
return $found
}
# Execute /system/addon.d/*.sh scripts with $1 parameter
run_stage() {
if [ -d /postinstall/tmp/addon.d/ ]; then
for script in $(find /postinstall/tmp/addon.d/ -name '*.sh' |sort -n); do
# we have no /sbin/sh in android, only recovery
# use /system/bin/sh here instead
sed -i '0,/#!\/sbin\/sh/{s|#!/sbin/sh|#!/system/bin/sh|}' $script
# we can't count on /tmp existing on an A/B device, so utilize /postinstall/tmp
# as a pseudo-/tmp dir
sed -i 's|. /tmp/backuptool.functions|. /postinstall/tmp/backuptool.functions|g' $script
$script $1
done
fi
}
case "$1" in
backup)
mkdir -p $C
if check_prereq; then
if check_whitelist postinstall/system; then
exit 127
fi
fi
check_blacklist postinstall/system
preserve_addon_d
run_stage pre-backup
run_stage backup
run_stage post-backup
;;
restore)
if check_prereq; then
if check_whitelist postinstall/tmp; then
exit 127
fi
fi
check_blacklist postinstall/tmp
run_stage pre-restore
run_stage restore
run_stage post-restore
restore_addon_d
rm -rf $C
rm -rf /postinstall/tmp
sync
;;
*)
echo "Usage: $0 {backup|restore}"
exit 1
esac
exit 0
|
