chore: Change primary branch from master to main (#14463)

.github/sync-repo-settings.yaml

@@ -2,7 +2,7 @@ rebaseMergeAllowed: true
 squashMergeAllowed: true
 mergeCommitAllowed: false
 branchProtectionRules:
-- pattern: master
+- pattern: main
   isAdminEnforced: false
   requiredStatusCheckContexts:
     - 'cla/google'

.github/workflows/ci.yml

@@ -2,10 +2,10 @@ name: CI
 on:
   pull_request:
     branches:
-      - master
+      - main
   push:
     branches:
-      - master
+      - main
   schedule:
     - cron: "20 8 * * *"
   workflow_dispatch:

.github/workflows/release-please-label.yml

@@ -2,7 +2,7 @@ name: release-please-label
 on:
   pull_request_target:
     branches:
-      - master
+      - main
     types:
       - opened
 jobs:

.github/workflows/spanner-integration-tests-against-emulator.yaml

@@ -1,7 +1,7 @@
 on:
   push:
     branches:
-      - master
+      - main
     paths:
       - 'google-cloud-spanner*/**'
   pull_request:

.kokoro/presubmit/acceptance.cfg

@@ -39,5 +39,5 @@ env_vars: {
 
 env_vars: {
   key: "EXTRA_CI_ARGS"
-  value: "--base=master --max-gem-count=4 --acceptance"
+  value: "--base=main --max-gem-count=4 --acceptance"
 }

.kokoro/presubmit/samples.cfg

@@ -39,5 +39,5 @@ env_vars: {
 
 env_vars: {
   key: "EXTRA_CI_ARGS"
-  value: "--base=master --max-gem-count=4 --samples-master"
+  value: "--base=main --max-gem-count=4 --samples-master"
 }

CI.md

@@ -193,7 +193,7 @@ Kokoro configurations for the three test trigger types (presubmit, continuous, a
 
 For example: continuous and nightly tests both run on both the oldest and newest Ruby. There is only one [continuous acceptance test config](.kokoro/continuous/acceptance.cfg), and it sets `$RUBY_VERSIONS` to `"OLDEST NEWEST"` indicating that the _one_ Kokoro job should run against both Ruby versions in sequence. However, there are two separate configs for nightly acceptance tests, [one for oldest Ruby](.kokoro/nightly/acceptance-oldest.cfg) and [one for newest Ruby](.kokoro/nightly/acceptance-newest.cfg). These set `$RUBY_VERSIONS` to only one value each: `"OLDEST"`, and `"NEWEST"`, respectively. Hence, each of these separate Kokoro jobs runs against a different Ruby version, and they run concurrently. (We should note, by the way, that the symbolic values `"OLDEST"` and `"NEWEST"` are mapped to specific Ruby versions in [`integration.sh`](.kokoro/integration.sh).) Therefore, if we want to change which versions of Ruby are run sequentially, we can modify this environment variable in the Kokoro configs. If we want to change versions of Ruby run concurrently in separate Kokoro jobs, we need to add or remove Kokoro config files (again, both here and in Google's internal source control.)
 
-The `$EXTRA_CI_ARGS` environment variable contains command line arguments passed directly to `toys ci`, as documented above. For example, presubmit tests analyze the changes between the PR and the master branch by setting `--base=master`, continuous tests analyze the changes since the previous commit by setting `--base=HEAD^`, and nightly tests test all libraries by setting `--all-gems`. These command line arguments can be modified to change the behavior of the various tests.
+The `$EXTRA_CI_ARGS` environment variable contains command line arguments passed directly to `toys ci`, as documented above. For example, presubmit tests analyze the changes between the PR and the main branch by setting `--base=main`, continuous tests analyze the changes since the previous commit by setting `--base=HEAD^`, and nightly tests test all libraries by setting `--all-gems`. These command line arguments can be modified to change the behavior of the various tests.
 
 Of note: the _actual_ trigger of Kokoro tests (i.e. whether it's a presubmit triggered by a PR, a continuous test triggered by pushes to the main branch, or a nightly test triggered by a cron) is controlled by the config files in the internal Google source control. For example, the time setting for the cron can be edited only in the internal config.
 

KOKORO.md

@@ -16,7 +16,7 @@
 
 #### Continuous
 
-- Run when a PR is merged to master. They run all unit tests. They run acceptance tests for a gem if the commit on master which triggered the build contains changes to that gem.
+- Run when a PR is merged to main. They run all unit tests. They run acceptance tests for a gem if the commit on main which triggered the build contains changes to that gem.
 
 #### Nightly
 
@@ -40,11 +40,11 @@
 
 ##### Continuous
 
-- Run when a PR is merged to master.
+- Run when a PR is merged to main.
 
 - Runs all tests for every sample.
 
-- Installs gems from master branch.
+- Installs gems from main branch.
 
 ##### Nightly
 
@@ -88,7 +88,7 @@
 
 ### Updating ruby versions
 
-1. Update the `RUBY_VERSIONS` in the [testing-infra-docker](https://github.com/googleapis/testing-infra-docker) ruby/multi/Dockerfile. When your PR is merged, the images will rebuild automatically. (Note: The windows image is not rebuilt automatically and needs to be handled manually.) This update must be in master to proceed.
+1. Update the `RUBY_VERSIONS` in the [testing-infra-docker](https://github.com/googleapis/testing-infra-docker) ruby/multi/Dockerfile. When your PR is merged, the images will rebuild automatically. (Note: The windows image is not rebuilt automatically and needs to be handled manually.) This update must be in main to proceed.
 1. Run `bundle exec rake kokoro:build` which will update .kokoro/osx.sh to use the ruby versions set above.
 1. Open a PR.
 1. Create the internal configs by following the steps [outlined here](https://docs.google.com/document/d/17Wg3ar8wlFTtut2CcAV9Geg8K9x28MK_UtUsYoyEx2s/edit#heading=h.o8nsr6d5n4va)

README.md

@@ -2,7 +2,7 @@
 
 Idiomatic Ruby client for [Google Cloud Platform](https://cloud.google.com/) services.
 
-[![Coverage Status](https://codecov.io/gh/googleapis/google-cloud-ruby/branch/master/graph/badge.svg)](https://codecov.io/gh/googleapis/google-cloud-ruby)
+[![Coverage Status](https://codecov.io/gh/googleapis/google-cloud-ruby/branch/main/graph/badge.svg)](https://codecov.io/gh/googleapis/google-cloud-ruby)
 [![Gem Version](https://badge.fury.io/rb/google-cloud.svg)](http://badge.fury.io/rb/google-cloud)
 
 * [Homepage](https://googleapis.github.io/google-cloud-ruby/)

Rakefile

@@ -130,7 +130,7 @@ end
 require_relative "rakelib/devsite/devsite_builder"
 
 namespace :docs do
-  desc "Builds documentation for all gems on current branch (assumes master)"
+  desc "Builds documentation for all gems on current branch (assumes main)"
   task :build_master do
     DevsiteBuilder.new(__dir__).build_master
   end
@@ -147,7 +147,7 @@ namespace :docs do
     DevsiteBuilder.new(__dir__).rebuild_tag(tag)
   end
 
-  desc "Builds documentation for all tags and current branch (assumes master)"
+  desc "Builds documentation for all tags and current branch (assumes main)"
   task :republish_all do
     DevsiteBuilder.new(__dir__).republish_all
   end
@@ -350,7 +350,7 @@ task :changes, [:gem] do |t, args|
     valid_gems.each do |gem|
       begin
         tag = current_release_tag gem
-        stats = (`git diff --stat #{tag}..master #{gem}`).split("\n")
+        stats = (`git diff --stat #{tag}..main #{gem}`).split("\n")
         if stats.empty?
           puts "#{gem}: no changes"
         else
@@ -368,7 +368,7 @@ namespace :changes do
     valid_gems.each do |gem|
       begin
         tag = current_release_tag gem
-        stats = (`git diff --stat #{tag}..master #{gem}/lib`).split("\n")
+        stats = (`git diff --stat #{tag}..main #{gem}/lib`).split("\n")
         if stats.empty?
           puts "#{gem}: no changes in lib"
         else
@@ -384,14 +384,14 @@ namespace :changes do
   task :diff, [:gem] do |t, args|
     gem = args[:gem]
     tag = current_release_tag gem
-    sh "git diff #{tag}..master #{gem}"
+    sh "git diff #{tag}..main #{gem}"
   end
 
   desc "Print the logs of changes since the last release."
   task :log, [:gem] do |t, args|
     gem = args[:gem]
     tag = current_release_tag gem
-    sh "git log #{tag}..master #{gem}"
+    sh "git log #{tag}..main #{gem}"
   end
 
   desc "Print the stats of changes since the last release."
@@ -402,7 +402,7 @@ namespace :changes do
       begin
         header gem
         tag = current_release_tag gem
-        sh "git diff --stat #{tag}..master #{gem}"
+        sh "git diff --stat #{tag}..main #{gem}"
       rescue => e
         puts e
       end
@@ -417,7 +417,7 @@ namespace :changes do
       begin
         header gem
         tag = current_release_tag gem
-        sh "git log --pretty=format:\"%h%x09%an%x09%ad%x09%s\" --date=relative #{tag}..master #{gem}"
+        sh "git log --pretty=format:\"%h%x09%an%x09%ad%x09%s\" --date=relative #{tag}..main #{gem}"
       rescue => e
         puts e
       end
@@ -431,7 +431,7 @@ namespace :changes do
   end
 
   def oldest_commit_since_release gem, tag
-    commit_dates = (`git log --pretty=format:\"%ad\" --date=relative #{tag}..master #{gem}`).split("\n")
+    commit_dates = (`git log --pretty=format:\"%ad\" --date=relative #{tag}..main #{gem}`).split("\n")
     commit_dates.last
   end
 end
@@ -661,7 +661,7 @@ end
 
 # Returns [gem_name, gem_version]
 def split_tag str
-  return [nil, str] if str == "master" # Support use of "master" even without gem name
+  return [nil, str] if str == "main" # Support use of "main" even without gem name
   fail "'tag' must be in the format <gem>/<version> Actual: #{str}" unless str.include?("/")
   parts = str.split("/")
   fail "'tag' must be in the format <gem>/<version>. Actual: #{str}" unless parts.length == 2

rakelib/kokoro/kokoro.rb

@@ -125,7 +125,7 @@ def nightly
 
   def post
     job_info
-    git_commit = ENV.fetch "KOKORO_GITHUB_COMMIT", "master"
+    git_commit = ENV.fetch "KOKORO_GITHUB_COMMIT", "main"
 
     markdown_files = Dir.glob "**/*.md"
     broken_markdown_links = check_links markdown_files,