Add eng/download-checkout-llvm.yml eng/download-llvm-release.py eng/d…

…ownload-llvm-release.yml

eng/download-checkout-llvm.yml

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+steps:
+- download: current
+  artifact: $(LLVMSourceBundle)
+  displayName: Download LLVM bundle
+
+- script: git clone $(Pipeline.Workspace)\$(LLVMSourceBundle)\$(LLVMSourceBundle) $(Build.SourcesDirectory)\src\llvm-project
+  displayName: Checkout LLVM from bundle (Windows)
+  condition: and(succeeded(), eq(variables['Agent.OS'], 'Windows_NT'))
+
+- script: git clone $(Pipeline.Workspace)/$(LLVMSourceBundle)/$(LLVMSourceBundle) $(Build.SourcesDirectory)/src/llvm-project
+  displayName: Checkout LLVM from bundle (Linux or macOS)
+  condition: and(succeeded(), ne(variables['Agent.OS'], 'Windows_NT'))

eng/download-llvm-release.py

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+#!/usr/bin/env python3
+#
+# Licensed to the .NET Foundation under one or more agreements.
+# The .NET Foundation licenses this file to you under the MIT license.
+#
+import argparse
+import io
+import os
+import sys
+import tarfile
+from urllib import request
+from urllib.error import URLError, HTTPError
+
+Release_urls = {
+  'llvmorg-9.0.1': {
+      'linux': 'https://github.com/llvm/llvm-project/releases/download/llvmorg-9.0.1/clang+llvm-9.0.1-x86_64-linux-gnu-ubuntu-16.04.tar.xz',
+      'macos': 'https://github.com/llvm/llvm-project/releases/download/llvmorg-9.0.1/clang+llvm-9.0.1-x86_64-apple-darwin.tar.xz'
+  },
+  'llvmorg-10.0.1': {
+      'linux': 'https://github.com/llvm/llvm-project/releases/download/llvmorg-10.0.1/clang+llvm-10.0.1-x86_64-linux-gnu-ubuntu-16.04.tar.xz',
+      'macos': 'https://github.com/llvm/llvm-project/releases/download/llvmorg-10.0.1/clang+llvm-10.0.1-x86_64-apple-darwin.tar.xz'
+  }
+}
+
+def download_llvm_release(release_url, output_dir):
+    try:
+        with request.urlopen(release_url) as response:
+            downloaded_bytes = response.read()
+    except (URLError, HTTPError) as err:
+        print(err)
+        sys.exit(1)
+
+    with io.BytesIO(downloaded_bytes) as downloaded_fileobj:
+        with tarfile.open(fileobj=downloaded_fileobj, mode='r:xz') as archive:
+            archive.extractall(path=output_dir)
+
+if __name__ == '__main__':
+    parser = argparse.ArgumentParser()
+    parser.add_argument('-release', required=True, choices=Release_urls.keys())
+    parser.add_argument('-os', required=True, choices=['linux', 'macos'])
+    parser.add_argument('-output-dir', dest='output_dir', default=os.getcwd())
+    args = parser.parse_args()
+
+    release_url = Release_urls[args.release][args.os]
+    download_llvm_release(release_url, args.output_dir)

eng/download-llvm-release.yml

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+parameters:
+- name: os
+  type: string
+- name: release
+  type: string
+
+steps:
+- script: python3 $(Build.SourcesDirectory)/eng/download-llvm-release.py -os ${{ parameters.os }} -release ${{ parameters.release }} -output-dir $(Pipeline.Workspace)
+  displayName: Download LLVM release from GitHub
+
+- script: echo '##vso[task.prependpath]'$(find $(Pipeline.Workspace) -name "clang+llvm-*" -type d)/bin
+  displayName: Add Clang and LLVM to the PATH