mainapp: Detect duplicate action targets

Tested:
    Passes the unit test suite and manually verified that the daemon
    works with a normal config on a zaius machine. Also verified that it
    produces an error if configured with multiple targets for a single
    action.

Change-Id: I8fba74f5fdfeb22c465e27b478805dc1ca702cd3
Signed-off-by: William A. Kennington III <wak@google.com>

1 files changed, 6 insertions, 0 deletions

diff --git a/mainapp.cpp b/mainapp.cpp
index c61fa85..29cd7e2 100644
--- a/mainapp.cpp
+++ b/mainapp.cpp
@@ -131,6 +131,12 @@ int main(int argc, char* argv[])
             exitWithError("Bad action specified.", argv);
         }
 
+        // Detect duplicate action target arguments
+        if (actionTargetMap.find(action) != actionTargetMap.end())
+        {
+            exitWithError("Duplicate action specified", argv);
+        }
+
         actionTargetMap[action] = std::move(value);
     }
     printActionTargetMap(actionTargetMap);