[infer][tests] No longer rely on Infer being in the PATH for the genrule integration test

Summary: This should no work even when Infer is not setup in the PATH

Reviewed By: jvillard

Differential Revision: D4262356

fbshipit-source-id: e3fa779

infer/tests/build_systems/buck/Makefile

@@ -20,14 +20,18 @@ include $(TESTS_DIR)/java.make
 include $(TESTS_DIR)/base.make
 
 $(JAR_OUTPUT): $(JAVA_SOURCE_FILES)
-	NO_BUCKD=1 buck build --no-cache //infer/tests/codetoanalyze/java/infer:compile
+	$(call silent_on_success,\
+	  cd $(ROOT_DIR) && \
+	  INFER_BIN=$(INFER_BIN) NO_BUCKD=1 buck build --no-cache //infer/tests/codetoanalyze/java/infer:compile)
 
 .PHONY: genrule
 genrule: $(JAR_OUTPUT)
-	NO_BUCKD=1 buck build --no-cache //infer/tests/codetoanalyze/java/infer:run_infer
+	$(call silent_on_success,\
+	  cd $(ROOT_DIR) && \
+	  INFER_BIN=$(INFER_BIN) NO_BUCKD=1 buck build --no-cache //infer/tests/codetoanalyze/java/infer:run_infer)
 
 infer-out/report.json: genrule $(INFER_BIN) $(JAVA_SOURCE_FILES)
 	$(call silent_on_success,\
 	  cd $(ROOT_DIR) && \
-	  NO_BUCKD=1 $(INFER_BIN) -a $(ANALYZER) --results-dir $(CURDIR)/infer-out  -- \
+	  INFER_BIN=$(INFER_BIN) NO_BUCKD=1 $(INFER_BIN) -a $(ANALYZER) --results-dir $(CURDIR)/infer-out  -- \
 	    buck build --no-cache //infer/tests/codetoanalyze/java/infer:compile)

infer/tests/codetoanalyze/java/infer/BUCK

@@ -1,5 +1,7 @@
 # TODO: this file exists only to support buck integration in infer/tests/build_systems/build_integration_tests.py
 
+import os
+
 sources = glob(['**/*.java'])
 
 java_library(
@@ -23,7 +25,7 @@ genrule(
     srcs = sources,
     out = 'infer-out',
     bash = ' '.join([
-        'infer',
+        os.getenv('INFER_BIN', 'infer'),
         '--sourcepath',
         '$SRCDIR',
         '--classpath',