schema: fix generator script to work with vendor directory

schema/generator

@@ -33,8 +33,15 @@ fi
 
 $GENDOC --f $IN --o $DOC
 
-# See schema/generator_import.go for instructions on updating the dependency
-PKG="google.golang.org/api/google-api-go-generator"
+# Though google-api-go-generator is a main, dex vendors the app using the same
+# tool it uses to vendor third party packages. Hence, it can be found in the
+# "vendor" directory.
+#
+# This vendoring is currently done with godep, but may change if/when we move to
+# another tool.
+#
+# See schema/generator_import.go for instructions on updating the dependency.
+PKG="github.com/coreos/dex/vendor/google.golang.org/api/google-api-go-generator"
 
 # First, write the discovery document into a go file so it can be served statically by the API
 cat << EOF > "${OUT}"
@@ -53,7 +60,7 @@ echo -n '`' >> "${OUT}"
 # Now build google-api-go-generator - we vendor so this is consistently reproducible
 GEN_PATH="bin/google-api-go-generator"
 if [ ! -f ${GEN_PATH} ]; then
-	GOPATH="${PWD}/Godeps/_workspace" go build -o ${GEN_PATH} ${PKG}
+    go build -o ${GEN_PATH} ${PKG}
 fi
 
 # Build the bindings