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				@@ -23,13 +23,7 @@ source tools/internal_ci/helper_scripts/prepare_build_linux_rc 
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				 # If this is a PR using RUN_TESTS_FLAGS var, then add flags to filter tests 
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				 if [ -n "$KOKORO_GITHUB_PULL_REQUEST_NUMBER" ] && [ -n "$RUN_TESTS_FLAGS" ]; then 
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				   sudo apt-get update 
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				-  retry=0 
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				-  until [ $retry -ge 3 ] 
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				-  do 
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				-    sudo apt-get install -y jq && break 
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				-    retry=$[$retry+1] 
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				-    sleep 5 
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				-  done 
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				+  sudo apt-get install -y jq 
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				   ghprbTargetBranch=$(curl -s https://api.github.com/repos/grpc/grpc/pulls/$KOKORO_GITHUB_PULL_REQUEST_NUMBER | jq -r .base.ref) 
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				   export RUN_TESTS_FLAGS="$RUN_TESTS_FLAGS --filter_pr_tests --base_branch origin/$ghprbTargetBranch" 
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				 fi 
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