Specific fix considering that the CI is now Azure

certbot/README.rst

@@ -73,9 +73,9 @@ ACME working area in github: https://github.com/ietf-wg-acme/acme
 
 |build-status|
 
-.. |build-status| image:: https://travis-ci.com/certbot/certbot.svg?branch=master
-   :target: https://travis-ci.com/certbot/certbot
-   :alt: Travis CI status
+.. |build-status| image:: https://img.shields.io/azure-devops/build/certbot/ba534f81-a483-4b9b-9b4e-a60bec8fee72/2/master
+   :target: https://dev.azure.com/certbot/certbot/_build?definitionId=2
+   :alt: Azure Pipelines CI status
 
 .. Do not modify this comment unless you know what you're doing. tag:links-end
 

tests/lock_test.py

@@ -59,9 +59,9 @@ def set_up():
     command = set_up_command(config_dir, logs_dir, work_dir, nginx_dir)
 
     dirs = [logs_dir, config_dir, work_dir]
-    # Travis and Circle CI set CI to true so we
-    # will always test Nginx's lock during CI
-    if os.environ.get('CI') == 'true' or util.exe_exists('nginx'):
+    # A specific environment variable for Azure Pipelines is SYSTEM_TEAMFOUNDATIONSERVERURI.
+    # If set, then we know we are on a CI job, and we test Nginx's lock.
+    if os.environ.get('SYSTEM_TEAMFOUNDATIONSERVERURI') == 'true' or util.exe_exists('nginx'):
         dirs.append(nginx_dir)
     else:
         logger.warning('Skipping Nginx lock tests')

tests/modification-check.py

@@ -57,7 +57,7 @@ def validate_scripts_content(repo_path, temp_cwd):
             'letsencrypt-auto-source/pieces/fetch.py')), temp_cwd)
 
         # Compare file against current version in the target branch
-        branch = os.environ.get('TRAVIS_BRANCH', 'master')
+        branch = os.environ.get('BUILD_SOURCEBRANCHNAME', 'master')
         url = (
             'https://raw.githubusercontent.com/certbot/certbot/{0}/certbot-auto'
             .format(branch))