Migrate master branch to main

We're a few years behind the curve on this one, but using "master" as a
programming term is a callous practice that explicitly uses the
historical institution of slavery as a cheap, racist metaphor. Switch to
using "main", as it's the new default in git and GitHub.

.azure-pipelines/INSTALL.md

@@ -1,8 +1,8 @@
 # Configuring Azure Pipelines with Certbot
 
 Let's begin. All pipelines are defined in `.azure-pipelines`. Currently there are two:
-* `.azure-pipelines/main.yml` is the main one, executed on PRs for master, and pushes to master,
-* `.azure-pipelines/advanced.yml` add installer testing on top of the main pipeline, and is executed for `test-*` branches, release branches, and nightly run for master.
+* `.azure-pipelines/main.yml` is the main one, executed on PRs for main, and pushes to main,
+* `.azure-pipelines/advanced.yml` add installer testing on top of the main pipeline, and is executed for `test-*` branches, release branches, and nightly run for main.
 
 Several templates are defined in `.azure-pipelines/templates`. These YAML files aggregate common jobs configuration that can be reused in several pipelines.
 
@@ -64,7 +64,7 @@ Azure Pipeline needs RW on code, RO on metadata, RW on checks, commit statuses,
 RW access here is required to allow update of the pipelines YAML files from Azure DevOps interface, and to
 update the status of builds and PRs on GitHub side when Azure Pipelines are triggered.
 Note however that no admin access is defined here: this means that Azure Pipelines cannot do anything with
-protected branches, like master, and cannot modify the security context around this on GitHub.
+protected branches, like main, and cannot modify the security context around this on GitHub.
 Access can be defined for all or only selected repositories, which is nice.
 ```
 
@@ -91,11 +91,11 @@ grant permissions from Azure Pipelines to GitHub in order to setup a GitHub OAut
 then are way too large (admin level on almost everything), while the classic approach does not add any more
 permissions, and works perfectly well.__
 
-- Select GitHub in "Select your repository section", choose certbot/certbot in Repository, master in default branch.
+- Select GitHub in "Select your repository section", choose certbot/certbot in Repository, main in default branch.
 - Click on YAML option for "Select a template"
 - Choose a name for the pipeline (eg. test-pipeline), and browse to the actual pipeline YAML definition in the
   "YAML file path" input (eg. `.azure-pipelines/test-pipeline.yml`)
-- Click "Save & queue", choose the master branch to build the first pipeline, and click "Save and run" button.
+- Click "Save & queue", choose the main branch to build the first pipeline, and click "Save and run" button.
 
 _Done. Pipeline is operational. Repeat to add more pipelines from existing YAML files in `.azure-pipelines`._
 

.azure-pipelines/main.yml

@@ -1,9 +1,9 @@
-# We run the test suite on commits to master so codecov gets coverage data
-# about the master branch and can use it to track coverage changes.
+# We run the test suite on commits to main so codecov gets coverage data
+# about the main branch and can use it to track coverage changes.
 trigger:
-  - master
+  - main
 pr:
-  - master
+  - main
   - '*.x'
 
 variables:

.azure-pipelines/nightly.yml

@@ -1,4 +1,4 @@
-# Nightly pipeline running each day for master.
+# Nightly pipeline running each day for main.
 trigger: none
 pr: none
 schedules:
@@ -6,7 +6,7 @@ schedules:
     displayName: Nightly build
     branches:
       include:
-      - master
+      - main
     always: true
 
 variables:

.github/pull_request_template.md

@@ -1,6 +1,6 @@
 ## Pull Request Checklist
 
 - [ ] The Certbot team has recently expressed interest in reviewing a PR for this. If not, this PR may be closed due our limited resources and need to prioritize how we spend them.
-- [ ] If the change being made is to a [distributed component](https://certbot.eff.org/docs/contributing.html#code-components-and-layout), edit the `master` section of `certbot/CHANGELOG.md` to include a description of the change being made.
+- [ ] If the change being made is to a [distributed component](https://certbot.eff.org/docs/contributing.html#code-components-and-layout), edit the `main` section of `certbot/CHANGELOG.md` to include a description of the change being made.
 - [ ] Add or update any documentation as needed to support the changes in this PR.
 - [ ] Include your name in `AUTHORS.md` if you like.

.github/workflows/merged.yaml

@@ -8,14 +8,14 @@ on:
 jobs:
   if_merged:
     # Forked repos can not access Mattermost secret.
-    if: github.event.pull_request.merged == true && !github.event.pull_request.head.repo.fork 
+    if: github.event.pull_request.merged == true && !github.event.pull_request.head.repo.fork
     runs-on: ubuntu-latest
     steps:
-    - uses: mattermost/action-mattermost-notify@master
+    - uses: mattermost/action-mattermost-notify@main
       with:
         MATTERMOST_WEBHOOK_URL: ${{ secrets.MATTERMOST_MERGE_WEBHOOK }}
         TEXT: >
           [${{ github.repository }}] |
           [${{ github.event.pull_request.title }}
           #${{ github.event.number }}](https://github.com/${{ github.repository }}/pull/${{ github.event.number }})
-          was merged into master by ${{ github.actor }}
+          was merged into main by ${{ github.actor }}

.github/workflows/notify_weekly.yaml

@@ -15,7 +15,7 @@ jobs:
         DATE=$(date --date="7 days ago" +"%Y-%m-%d")
         echo "MERGED_URL=https://github.com/pulls?q=merged%3A%3E${DATE}+org%3Acertbot" >> $GITHUB_ENV
         echo "UPDATED_URL=https://github.com/pulls?q=updated%3A%3E${DATE}+org%3Acertbot" >> $GITHUB_ENV
-    - uses: mattermost/action-mattermost-notify@master
+    - uses: mattermost/action-mattermost-notify@main
       with:
         MATTERMOST_WEBHOOK_URL: ${{ secrets.MATTERMOST_WEBHOOK_URL }}
         MATTERMOST_CHANNEL: private-certbot

certbot/CHANGELOG.md

@@ -2,7 +2,7 @@
 
 Certbot adheres to [Semantic Versioning](https://semver.org/).
 
-## 3.0.0 - master
+## 3.0.0 - main
 
 ### Added
 

certbot/README.rst

@@ -2,11 +2,11 @@
 
 |build-status|
 
-.. |build-status| image:: https://img.shields.io/azure-devops/build/certbot/ba534f81-a483-4b9b-9b4e-a60bec8fee72/5/master
+.. |build-status| image:: https://img.shields.io/azure-devops/build/certbot/ba534f81-a483-4b9b-9b4e-a60bec8fee72/5/main
    :target: https://dev.azure.com/certbot/certbot/_build?definitionId=5
    :alt: Azure Pipelines CI status
  
-.. image:: https://raw.githubusercontent.com/EFForg/design/master/logos/eff-certbot-lockup.png
+.. image:: https://raw.githubusercontent.com/EFForg/design/main/logos/eff-certbot-lockup.png
   :width: 200
   :alt: EFF Certbot Logo
 
@@ -39,7 +39,7 @@ Documentation: https://certbot.eff.org/docs
 
 Software project: https://github.com/certbot/certbot
 
-Changelog: https://github.com/certbot/certbot/blob/master/certbot/CHANGELOG.md
+Changelog: https://github.com/certbot/certbot/blob/main/certbot/CHANGELOG.md
 
 For Contributors: https://certbot.eff.org/docs/contributing.html
 

certbot/docs/contributing.rst

@@ -258,8 +258,8 @@ certificate once it is issued. Some plugins, like the built-in Apache and Nginx
 plugins, implement both interfaces and perform both tasks. Others, like the
 built-in Standalone authenticator, implement just one interface.
 
-.. _interfaces.py: https://github.com/certbot/certbot/blob/master/certbot/certbot/interfaces.py
-.. _plugins/common.py: https://github.com/certbot/certbot/blob/master/certbot/certbot/plugins/common.py#L45
+.. _interfaces.py: https://github.com/certbot/certbot/blob/main/certbot/certbot/interfaces.py
+.. _plugins/common.py: https://github.com/certbot/certbot/blob/main/certbot/certbot/plugins/common.py#L45
 
 
 Authenticators
@@ -389,7 +389,7 @@ identifier ``metadata-1``.
 
 The script used to generate the snapcraft.yaml files for our own externally
 snapped plugins can be found at
-https://github.com/certbot/certbot/blob/master/tools/snap/generate_dnsplugins_snapcraft.sh.
+https://github.com/certbot/certbot/blob/main/tools/snap/generate_dnsplugins_snapcraft.sh.
 
 For more information on building externally snapped plugins, see the section on
 :ref:`Building snaps`.
@@ -562,7 +562,7 @@ Building the Certbot and DNS plugin snaps
 
 Instructions for how to manually build and run the Certbot snap and the externally
 snapped DNS plugins that the Certbot project supplies are located in the README
-file at https://github.com/certbot/certbot/tree/master/tools/snap.
+file at https://github.com/certbot/certbot/tree/main/tools/snap.
 
 Updating the documentation
 ==========================

certbot/docs/packaging.rst

@@ -25,7 +25,7 @@ We release packages and upload them to PyPI (wheels and source tarballs).
 
 The following scripts are used in the process:
 
-- https://github.com/certbot/certbot/blob/master/tools/release.sh
+- https://github.com/certbot/certbot/blob/main/tools/release.sh
 
 We use git tags to identify releases, using `Semantic Versioning`_. For
 example: `v0.11.1`.
@@ -50,7 +50,7 @@ key servers.
 Notes for package maintainers
 =============================
 
-0. Please use our tagged releases, not ``master``!
+0. Please use our tagged releases, not ``main``!
 
 1. Do not package ``certbot-compatibility-test`` as it's only used internally.
 

certbot/docs/using.rst

@@ -99,7 +99,7 @@ Apache
 ------
 
 The Apache plugin currently `supports
-<https://github.com/certbot/certbot/blob/master/certbot-apache/certbot_apache/_internal/entrypoint.py>`_
+<https://github.com/certbot/certbot/blob/main/certbot-apache/certbot_apache/_internal/entrypoint.py>`_
 modern OSes based on Debian, Fedora, SUSE, Gentoo, CentOS and Darwin.
 This automates both obtaining *and* installing certificates on an Apache
 webserver. To specify this plugin on the command line, simply include

letstest/letstest/multitester.py

@@ -66,9 +66,9 @@ parser.add_argument('--branch',
 parser.add_argument('--pull_request',
                     default='~',
                     help='certbot/certbot pull request to trial')
-parser.add_argument('--merge_master',
+parser.add_argument('--merge_main',
                     action='store_true',
-                    help="if set merges PR into master branch of certbot/certbot")
+                    help="if set merges PR into main branch of certbot/certbot")
 parser.add_argument('--saveinstances',
                     action='store_true',
                     help="don't kill EC2 instances after run, useful for debugging")
@@ -207,7 +207,7 @@ def block_until_instance_ready(booting_instance, extra_wait_time=20):
 # Fabric Routines
 #-------------------------------------------------------------------------------
 def local_git_clone(local_cxn, repo_url, log_dir):
-    """clones master of repo_url"""
+    """clones main of repo_url"""
     local_cxn.local('cd %s && if [ -d letsencrypt ]; then rm -rf letsencrypt; fi' % log_dir)
     local_cxn.local('cd %s && git clone %s letsencrypt'% (log_dir, repo_url))
     local_cxn.local('cd %s && tar czf le.tar.gz letsencrypt'% log_dir)
@@ -219,17 +219,17 @@ def local_git_branch(local_cxn, repo_url, branch_name, log_dir):
         (log_dir, repo_url, branch_name))
     local_cxn.local('cd %s && tar czf le.tar.gz letsencrypt' % log_dir)
 
-def local_git_PR(local_cxn, repo_url, PRnumstr, log_dir, merge_master=True):
-    """clones specified pull request from repo_url and optionally merges into master"""
+def local_git_PR(local_cxn, repo_url, PRnumstr, log_dir, merge_main=True):
+    """clones specified pull request from repo_url and optionally merges into main"""
     local_cxn.local('cd %s && if [ -d letsencrypt ]; then rm -rf letsencrypt; fi' % log_dir)
     local_cxn.local('cd %s && git clone %s letsencrypt' % (log_dir, repo_url))
     local_cxn.local('cd %s && cd letsencrypt && '
         'git fetch origin pull/%s/head:lePRtest' % (log_dir, PRnumstr))
     local_cxn.local('cd %s && cd letsencrypt && git checkout lePRtest' % log_dir)
-    if merge_master:
+    if merge_main:
         local_cxn.local('cd %s && cd letsencrypt && git remote update origin' % log_dir)
         local_cxn.local('cd %s && cd letsencrypt && '
-            'git merge origin/master -m "testmerge"' % log_dir)
+            'git merge origin/main -m "testmerge"' % log_dir)
     local_cxn.local('cd %s && tar czf le.tar.gz letsencrypt' % log_dir)
 
 def local_repo_to_remote(cxn, log_dir):
@@ -382,9 +382,9 @@ def main():
         print("Making local git repo")
         if cl_args.pull_request != '~':
             print('Testing PR %s ' % cl_args.pull_request,
-                  "MERGING into master" if cl_args.merge_master else "")
+                  "MERGING into main" if cl_args.merge_main else "")
             local_git_PR(local_cxn, cl_args.repo, cl_args.pull_request, log_dir,
-                         cl_args.merge_master)
+                         cl_args.merge_main)
         elif cl_args.branch != '~':
             print('Testing branch %s of %s' % (cl_args.branch, cl_args.repo))
             local_git_branch(local_cxn, cl_args.repo, cl_args.branch, log_dir)

tools/_changelog_top.txt

@@ -1,4 +1,4 @@
-## nextversion - master
+## nextversion - main
 
 ### Added
 

tools/_release.sh

@@ -97,7 +97,7 @@ fi
 git checkout "$RELEASE_BRANCH"
 
 # Update changelog
-sed -i "s/master/$(date +'%Y-%m-%d')/" certbot/CHANGELOG.md
+sed -i "s/main/$(date +'%Y-%m-%d')/" certbot/CHANGELOG.md
 git add certbot/CHANGELOG.md
 git commit -m "Update changelog for $version release"
 
@@ -205,7 +205,7 @@ git tag --local-user "$RELEASE_GPG_KEY" --sign --message "Release $version" "$ta
 git rm --cached -r "$built_package_dir"
 git commit -m "Remove built packages from git"
 
-# Add master section to CHANGELOG.md
+# Add main section to CHANGELOG.md
 header=$(head -n 4 certbot/CHANGELOG.md)
 body=$(sed s/nextversion/$nextversion/ tools/_changelog_top.txt)
 footer=$(tail -n +5 certbot/CHANGELOG.md)