Run clang-tidy in CUDA 9.2 container

Jenkinsfile

@@ -115,23 +115,12 @@ def buildClangTidyJob() {
     node(nodeReq) {
         unstash name: 'srcs'
         echo "Running clang-tidy job..."
+        // Invoke command inside docker
         // Install Google Test and Python yaml
+        dockerTarget = "gpu"
+        dockerArgs = "--build-arg CUDA_VERSION=9.2"
         sh """
-        pip3 install pyyaml
-
-        rm -rf gtest googletest-release-1.7.0
-        wget -nc https://github.com/google/googletest/archive/release-1.7.0.zip
-        jar -xf release-1.7.0.zip
-        mv googletest-release-1.7.0 gtest && cd gtest
-        cmake . && make
-        mkdir lib && mv libgtest.a lib
-        cd ..
-        rm -rf release-1.7.0.zip*
-        """
-        // Run clang-tidy job
-        sh """#!/bin/bash
-        source tests/ci_build/setup_cuda_path.sh
-        python3 tests/ci_build/tidy.py --gtest-path=${WORKSPACE}/gtest
+        ${dockerRun} ${dockerTarget} ${dockerArgs} tests/ci_build/clang_tidy.sh
         """
       }
   }

tests/ci_build/Dockerfile.clang_tidy

@@ -0,0 +1,45 @@
+ARG CUDA_VERSION
+FROM nvidia/cuda:$CUDA_VERSION-devel-ubuntu18.04
+
+# Environment
+ENV DEBIAN_FRONTEND noninteractive
+
+# Install all basic requirements
+RUN \
+    apt-get update && \
+    apt-get install -y tar unzip wget git build-essential cmake python3 python3-pip llvm-7 clang-tidy-7 clang-7
+
+# Set default clang-tidy version
+RUN \
+    update-alternatives --install /usr/bin/clang-tidy clang-tidy /usr/bin/clang-tidy-7 100 && \
+    update-alternatives --install /usr/bin/clang clang /usr/bin/clang-7 100
+
+# NCCL2 (License: https://docs.nvidia.com/deeplearning/sdk/nccl-sla/index.html)
+RUN \
+    export CUDA_SHORT=`echo $CUDA_VERSION | egrep -o '[0-9]+\.[0-9]'` && \
+    if [ "${CUDA_SHORT}" != "10.0" ]; then \
+    wget https://developer.download.nvidia.com/compute/redist/nccl/v2.2/nccl_2.2.13-1%2Bcuda${CUDA_SHORT}_x86_64.txz && \
+    tar xf "nccl_2.2.13-1+cuda${CUDA_SHORT}_x86_64.txz" && \
+    cp nccl_2.2.13-1+cuda${CUDA_SHORT}_x86_64/include/nccl.h /usr/include && \
+    cp nccl_2.2.13-1+cuda${CUDA_SHORT}_x86_64/lib/* /usr/lib && \
+    rm -f nccl_2.2.13-1+cuda${CUDA_SHORT}_x86_64.txz && \
+    rm -r nccl_2.2.13-1+cuda${CUDA_SHORT}_x86_64; fi
+
+# Install Python packages
+RUN \
+    pip3 install pyyaml
+
+ENV GOSU_VERSION 1.10
+
+# Install lightweight sudo (not bound to TTY)
+RUN set -ex; \
+    wget -O /usr/local/bin/gosu "https://github.com/tianon/gosu/releases/download/$GOSU_VERSION/gosu-amd64" && \
+    chmod +x /usr/local/bin/gosu && \
+    gosu nobody true
+
+# Default entry-point to use if running locally
+# It will preserve attributes of created files
+COPY entrypoint.sh /scripts/
+
+WORKDIR /workspace
+ENTRYPOINT ["/scripts/entrypoint.sh"]

tests/ci_build/clang_tidy.sh

@@ -0,0 +1,12 @@
+#!/bin/bash
+
+rm -rf gtest googletest-release-1.7.0
+wget -nc https://github.com/google/googletest/archive/release-1.7.0.zip
+unzip -n release-1.7.0.zip
+mv googletest-release-1.7.0 gtest && cd gtest
+cmake . && make
+mkdir lib && mv libgtest.a lib
+cd ..
+rm -rf release-1.7.0.zip*
+
+python3 tests/ci_build/tidy.py --gtest-path=${PWD}/gtest

tests/ci_build/tidy.py

@@ -43,8 +43,6 @@ def __init__(self, gtest_path, cpp_lint, cuda_lint):
             raise ValueError('Both --cpp and --cuda are set to 0.')
         self.root_path = os.path.abspath(os.path.curdir)
         print('Project root:', self.root_path)
-        if 'xgboost' not in os.path.basename(self.root_path.rstrip('/')):
-            raise ValueError('Linter should be invoked in project root.')
         self.cdb_path = os.path.join(self.root_path, 'cdb')
 
     def __enter__(self):