CI: Use templated ansible_user for localhost Ansible tests

refs #1022, #1116

.ci/localhost_ansible_tests.py

@@ -3,8 +3,6 @@
 
 from __future__ import print_function
 
-import getpass
-import io
 import os
 import subprocess
 import sys
@@ -57,18 +55,6 @@ with ci_lib.Fold('machine_prep'):
         os.chdir(IMAGE_PREP_DIR)
         ci_lib.run("ansible-playbook -c local -i localhost, _user_accounts.yml")
 
-    # FIXME Don't hardcode https://github.com/mitogen-hq/mitogen/issues/1022
-    #       and os.environ['USER'] is not populated on Azure macOS runners.
-    os.chdir(HOSTS_DIR)
-    with io.open('default.hosts', 'r+', encoding='utf-8') as f:
-        user = getpass.getuser()
-        content = f.read()
-        content = content.replace("{{ lookup('pipe', 'whoami') }}", user)
-        f.seek(0)
-        f.write(content)
-        f.truncate()
-    ci_lib.dump_file('default.hosts')
-
     cmd = ';'.join([
         'from __future__ import print_function',
         'import os, sys',

tests/ansible/hosts/default.hosts

@@ -4,8 +4,7 @@
 # When running the tests outside CI, make a single 'target' host which is the
 # local machine. The ansible_user override is necessary since some tests want a
 # fixed ansible.cfg remote_user setting to test against.
-# FIXME Hardcoded by replacement in some CI runs https://github.com/mitogen-hq/mitogen/issues/1022
-#       and os.environ['USER'] is not populated on Azure macOS runners.
+# os.environ['USER'] is an empty string on GitHub Actions macOS runners.
 target ansible_host=localhost ansible_user="{{ lookup('pipe', 'whoami') }}"
 
 [test-targets]