|  | @@ -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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