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#!/sbin/sh
# Validate that the incoming OTA is compatible with an already-installed
# system
grep -q "Command:.*\"--wipe\_data\"" /tmp/recovery.log
if [ $? -eq 0 ]; then
echo "Data will be wiped after install; skipping signature check..."
exit 0
fi
grep -q "Command:.*\"--headless\"" /tmp/recovery.log
if [ $? -eq 0 ]; then
echo "Headless mode install; skipping signature check..."
exit 0
fi
if [ -f /data/system/packages.xml -a -f /tmp/releasekey ]; then
relCert=$(grep -A3 'package name="com.android.htmlviewer"' /data/system/packages.xml | grep "cert index" | head -n 1 | sed -e 's|.*"\([[:digit:]][[:digit:]]*\)".*|\1|g')
# Tools missing? Err on the side of caution and exit cleanly
if [ "z$relCert" == "z" ]; then exit 0; fi
grep "cert index=\"$relCert\"" /data/system/packages.xml | grep -q `cat /tmp/releasekey`
if [ $? -ne 0 ]; then
echo "You have an installed system that isn't signed with this build's key, aborting..."
exit 124
fi
fi
exit 0
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