[build] Automatic BUILD dependency generation (grpc#29597)

* [build] Automatic dependency analysis

* add to sanity

* Automated change: Fix sanity tests

* review feedback

Co-authored-by: ctiller <[email protected]>

Author: ctiller

BUILD

@@ -2506,10 +2506,11 @@ grpc_cc_library(
         "src/core/lib/surface/channel_init.h",
     ],
     language = "c++",
+    tags = ["grpc-autodeps"],
     deps = [
         "channel_stack_builder",
         "channel_stack_type",
-        "gpr_base",
+        "gpr_platform",
     ],
 )
 

tools/buildgen/generate_projects.sh

@@ -26,12 +26,14 @@ if [[ "${YAML_OK}" != "True" ]]; then
   python3 -m pip install --upgrade --ignore-installed PyYAML==5.3.1 --user
 fi
 
+cd `dirname $0`/../..
+
+tools/distrib/fix_build_deps.py
+
 echo "Generating build_autogenerated.yaml from bazel BUILD file"
 rm -f build_autogenerated.yaml
 python3 tools/buildgen/extract_metadata_from_bazel_xml.py
 
-cd `dirname $0`/../..
-
 tools/buildgen/build_cleaner.py build_handwritten.yaml
 
 # check build_autogenerated.yaml is already in its "clean" form

tools/distrib/buildozer.sh

@@ -0,0 +1,77 @@
+#! /bin/bash
+# Copyright 2019 The gRPC Authors
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+set -e
+
+BUILDOZER_VERSION="4.2.2"
+TEMP_BUILDOZER_PATH="/tmp/buildozer-for-grpc"
+
+function error_handling() {
+    error=$1
+    if [[ -x "$error" ]]; then
+        echo "${error}"
+        exit 1
+    fi
+}
+
+function download_buildozer() {
+    platform="$(uname -s)"
+    case "${platform}" in
+        Linux*)     download_link="https://github.com/bazelbuild/buildtools/releases/download/${BUILDOZER_VERSION}/buildozer-linux-amd64";;
+        Darwin*)    download_link="https://github.com/bazelbuild/buildtools/releases/download/${BUILDOZER_VERSION}/buildozer-darwin-amd64";;
+        *)          error_handling "Unsupported platform: ${platform}";;
+    esac
+
+    if [ -x "$(command -v curl)" ]; then
+        curl -L -o ${TEMP_BUILDOZER_PATH} ${download_link}
+    elif [ -x "$(command -v wget)" ]; then
+        wget -O ${TEMP_BUILDOZER_PATH} ${download_link}
+    else
+        error_handling "Download failed: curl and wget not available"
+    fi
+
+    chmod +x ${TEMP_BUILDOZER_PATH}
+}
+
+
+# Get the correct version of buildozer
+if [ -x "$(command -v buildozer)" ]; then
+    existing_buildozer_version="$(buildozer -version 2>&1 | head -n1 | cut -d" " -f3)"
+    if [[ "${existing_buildozer_version}" != "${BUILDOZER_VERSION}" ]]; then
+        download_buildozer
+        buildozer_bin="${TEMP_BUILDOZER_PATH}"
+    else
+        buildozer_bin="buildozer"
+    fi
+else
+    if [ -x ${TEMP_BUILDOZER_PATH} ]; then
+        existing_buildozer_version="$(${TEMP_BUILDOZER_PATH} -version 2>&1 | head -n1 | cut -d" " -f3)"
+        if [[ "${existing_buildozer_version}" != "${BUILDOZER_VERSION}" ]]; then
+            download_buildozer
+        fi
+    else
+        download_buildozer
+    fi
+    buildozer_bin="${TEMP_BUILDOZER_PATH}"
+fi
+
+# cd to repo root
+dir=$(dirname "${0}")
+cd "${dir}/../.."
+
+set -ex
+
+# shellcheck disable=SC2086,SC2068
+${buildozer_bin} "$@"