Only do bugreport on user build with ADB enabled

This makes it less likely that users that don't know what a bugreport is
will trigger it, but leaves the possibility for developers to trigger a
bugreport with a key combo.

Bug: 5866877
Change-Id: Ifc3c5126ec9342880a3635845a89c5a4a40156d2
diff --git a/bugmailer/ b/bugmailer/
index ba8eeb7..93d1c8a 100755
--- a/bugmailer/
+++ b/bugmailer/
@@ -1,5 +1,12 @@
+# Do not allow bugreports on user builds unless USB debugging
+# is enabled.
+if [ "x$(getprop" = "xuser" -a \
+     "x$(getprop init.svc.adbd)" != "xrunning" ]; then
+  exit 0
 timestamp=`date +'%Y-%m-%d-%H-%M-%S'`