Merge "Add help message for likely typo to lunch" am: 757e2e1fc1

Original change: https://android-review.googlesource.com/c/platform/build/+/1736893

Change-Id: I3ed2ca1d5f2039f955db4f6d5a1401b4e7b307b8
diff --git a/envsetup.sh b/envsetup.sh
index 120f6e0..bbb18e5 100644
--- a/envsetup.sh
+++ b/envsetup.sh
@@ -703,6 +703,10 @@
     build_build_var_cache
     if [ $? -ne 0 ]
     then
+        if [[ "$product" =~ .*_(eng|user|userdebug) ]]
+        then
+            echo "Did you mean -${product/*_/}? (dash instead of underscore)"
+        fi
         return 1
     fi
     export TARGET_PRODUCT=$(get_build_var TARGET_PRODUCT)