launchpad: Add warning about Bazaar code hosting phase-out

.github/workflows/pythonpackage.yml

@@ -84,6 +84,6 @@ jobs:
         if: "matrix.os == 'windows-latest'"
       - name: Run mypy
         run: |
-          python -m pip install mypy types-PyYAML types-paramiko types-setuptools
+          python -m pip install mypy types-PyYAML types-paramiko types-setuptools typing-extensions
           python -m mypy breezy
         if: "matrix.python-version != 'pypy3'"

breezy/plugins/launchpad/__init__.py

@@ -35,12 +35,20 @@
 # see http://wiki.bazaar.canonical.com/Specs/BranchRegistrationTool
 
 from ... import (
+    ui,
     version_info,  # noqa: F401
 )
 from ...commands import plugin_cmds
 from ...directory_service import directories
 from ...help_topics import topic_registry
 
+# Register the Bazaar deprecation warning template
+ui.UIFactory._user_warning_templates["launchpad_bazaar_deprecation"] = (
+    "Launchpad is phasing out Bazaar code hosting. "
+    "For more information, see: "
+    "https://blog.launchpad.net/general/phasing-out-bazaar-code-hosting"
+)
+
 for klsname, aliases in [
     ("cmd_launchpad_open", ["lp-open"]),
     ("cmd_launchpad_login", ["lp-login"]),
@@ -89,6 +97,9 @@ def load_tests(loader, basic_tests, pattern):
 Launchpad.net provides free Bazaar branch hosting with integrated bug and
 specification tracking.
 
+NOTE: Launchpad is phasing out Bazaar code hosting. For more information, see:
+https://blog.launchpad.net/general/phasing-out-bazaar-code-hosting
+
 The bzr client (through the plugin called 'launchpad') has special
 features to communicate with Launchpad:
 

breezy/plugins/launchpad/forge.py

@@ -430,6 +430,9 @@ def _publish_bzr(
         allow_lossy=True,
         tag_selector=None,
     ):
+        from ... import ui
+
+        ui.ui_factory.show_user_warning("launchpad_bazaar_deprecation")
         to_path = self._get_derived_bzr_path(base_branch, name, owner, project)
         to_transport = get_transport(BZR_SCHEME_MAP["ssh"] + to_path)
         try:

breezy/plugins/launchpad/lp_directory.py

@@ -18,7 +18,7 @@
 
 from urllib.parse import urlsplit
 
-from ... import debug, errors, trace, transport
+from ... import debug, errors, trace, transport, ui
 from ...urlutils import InvalidURL, join, split
 from .account import get_lp_login
 from .uris import LPNET_SERVICE_ROOT
@@ -92,6 +92,7 @@ def _resolve_via_api(path, url, api_base_url=LPNET_SERVICE_ROOT):
         path, subpath = split(path)
         subpaths.insert(0, subpath)
     if lp_branch:
+        ui.ui_factory.show_user_warning("launchpad_bazaar_deprecation")
         return {
             "urls": [
                 join(lp_branch.composePublicURL(scheme="bzr+ssh"), *subpaths),

doc/en/release-notes/brz-3.3.txt

@@ -10,6 +10,11 @@ brz 3.3.13
 
 :3.3.13: UNRELEASED
 
+* Add warning when accessing Bazaar branches on Launchpad, as Launchpad
+  is phasing out Bazaar code hosting. The warning can be suppressed by
+  adding ``launchpad_bazaar_deprecation`` to the ``suppress_warnings``
+  configuration option. (Jelmer Vernooij)
+
 brz 3.3.12
 ##########