[all] Add macos checks to to CI

.cirrus.yml

@@ -1,4 +1,6 @@
 task:
+  # don't run on release tags since it creates O(n^2) tasks where n is the number of plugins
+  only_if: $CIRRUS_TAG == ''
   use_compute_credits: $CIRRUS_USER_COLLABORATOR == 'true' && $CIRRUS_PR == ''
   container:
     dockerfile: .ci/Dockerfile
@@ -66,6 +68,8 @@ task:
         - export CIRRUS_COMMIT_MESSAGE=`cat /tmp/cirrus_commit_message.txt`
 
 task:
+  # don't run on release tags since it creates O(n^2) tasks where n is the number of plugins
+  only_if: $CIRRUS_TAG == ''
   use_compute_credits: $CIRRUS_USER_COLLABORATOR == 'true'
   osx_instance:
     image: mojave-xcode-11.2.1-flutter
@@ -97,3 +101,28 @@ task:
         - flutter channel $CHANNEL
         - ./script/incremental_build.sh build-examples --ipa
         - ./script/incremental_build.sh drive-examples
+
+task:
+  # don't run on release tags since it creates O(n^2) tasks where n is the number of plugins
+  only_if: $CIRRUS_TAG == ''
+  use_compute_credits: $CIRRUS_USER_COLLABORATOR == 'true'
+  osx_instance:
+    image: mojave-xcode-11.3-flutter
+  setup_script:
+    - pod repo update
+    - flutter config --enable-macos-desktop
+  upgrade_script:
+    - flutter channel master
+    - flutter upgrade
+    - git fetch origin master
+  activate_script: pub global activate flutter_plugin_tools
+  matrix:
+    - name: lint_darwin_plugins
+      script: ./script/lint_darwin_plugins.sh
+    - name: build-apps+drive-examples
+      env:
+        PATH: $PATH:/usr/local/bin
+      build_script:
+        - flutter channel master
+        - ./script/incremental_build.sh build-examples --macos --no-ipa
+        - ./script/incremental_build.sh drive-examples --macos

script/lint_darwin_plugins.sh

@@ -0,0 +1,88 @@
+#!/bin/bash
+
+# This script lints and tests iOS and macOS platform code.
+
+# So that users can run this script from anywhere and it will work as expected.
+readonly SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" >/dev/null && pwd)"
+readonly REPO_DIR="$(dirname "$SCRIPT_DIR")"
+
+source "$SCRIPT_DIR/common.sh"
+
+function lint_package() {
+  local package_name="$1"
+  local package_dir="${REPO_DIR}/packages/$package_name/"
+  local failure_count=0
+
+  # These podspecs are temporary multi-platform adoption dummy files.
+  local skipped_podspecs=(
+    "url_launcher_web.podspec"
+    "google_sign_in_web.podspec"
+  )
+
+  # TODO: These packages have analyzer warnings. Remove plugins from this list as issues are fixed.
+  local skip_analysis_packages=(
+    "camera.podspec" # https://github.com/flutter/flutter/issues/42673
+  )
+  find "${package_dir}" -type f -name "*\.podspec" | while read podspec; do
+    local podspecBasename=$(basename "${podspec}")
+    if [[ "${skipped_podspecs[*]}" =~ "${podspecBasename}" ]]; then
+      continue
+    fi
+
+    # TODO: Remove --allow-warnings flag https://github.com/flutter/flutter/issues/41444
+    local lint_args=(
+      lib
+      lint
+      "${podspec}"
+      --allow-warnings
+      --fail-fast
+      --silent
+    )
+    if [[ ! "${skip_analysis_packages[*]}" =~ "${podspecBasename}" ]]; then
+      lint_args+=(--analyze)
+      echo "Linting and analyzing ${podspecBasename}"
+    else
+      echo "Linting ${podspecBasename}"
+    fi
+
+    # Build as frameworks.
+    # This will also run any tests set up as a test_spec. See https://blog.cocoapods.org/CocoaPods-1.3.0.
+    pod "${lint_args[@]}"
+    if [[ "$?" -ne 0 ]]; then
+      error "Package ${package_name} has framework issues. Run \"pod lib lint ${podspec} --analyze\" to inspect."
+      failure_count+=1
+    fi
+
+    # Build as libraries.
+    lint_args+=(--use-libraries)
+    pod "${lint_args[@]}"
+    if [[ "$?" -ne 0 ]]; then
+      error "Package ${package_name} has library issues. Run \"pod lib lint ${podspec} --use-libraries --analyze\" to inspect."
+      failure_count+=1
+    fi
+  done
+
+  return "${failure_count}"
+}
+
+function lint_packages() {
+  if [[ ! "$(which pod)" ]]; then 
+    echo "pod not installed. Skipping."
+    return
+  fi
+
+  local failure_count=0
+  for package_name in "$@"; do   
+    lint_package "${package_name}"
+    failure_count+="$?"
+  done
+
+  return "${failure_count}"
+}
+
+# Sets CHANGED_PACKAGE_LIST
+check_changed_packages
+
+if [[ "${#CHANGED_PACKAGE_LIST[@]}" != 0 ]]; then
+  lint_packages "${CHANGED_PACKAGE_LIST[@]}"
+fi