Remove straight.plugin dependency (#80084) (#81019)

(cherry picked from commit f587856)

changelogs/fragments/build-no-straight.yaml

@@ -0,0 +1,2 @@
+minor_changes:
+  - Removed ``straight.plugin`` from the build and packaging requirements.

docs/docsite/requirements.txt

@@ -15,4 +15,3 @@ sphinx-notfound-page >= 0.6
 sphinx-intl
 sphinx-ansible-theme >= 0.9.1
 resolvelib
-straight.plugin # Needed for hacking/build-ansible.py which is the backend build script

hacking/build-ansible.py

@@ -10,16 +10,20 @@ __metaclass__ = type
 
 
 import argparse
+import importlib
+import inspect
 import os.path
+import pkgutil
 import sys
-
-from straight.plugin import load
+import typing as t
 
 try:
     import argcomplete
 except ImportError:
     argcomplete = None
 
+C = t.TypeVar('C')
+
 
 def build_lib_path(this_script=__file__):
     """Return path to the common build library directory."""
@@ -55,6 +59,27 @@ def create_arg_parser(program_name):
     return parser
 
 
+def load(package: str, subclasses: t.Type[C]) -> list[t.Type[C]]:
+    """Load modules in the specified package and return concrete types that derive from the specified base class."""
+    for module in pkgutil.iter_modules(importlib.import_module(package).__path__, f'{package}.'):
+        try:
+            importlib.import_module(module.name)
+        except ImportError:
+            pass  # ignore plugins which are missing dependencies
+
+    types: set[t.Type[C]] = set()
+    queue: list[t.Type[C]] = [subclasses]
+
+    while queue:
+        for child in queue.pop().__subclasses__():
+            queue.append(child)
+
+            if not inspect.isabstract(child):
+                types.add(child)
+
+    return sorted(types, key=lambda sc: sc.__name__)
+
+
 def main():
     """
     Start our run.
@@ -69,7 +94,9 @@ def main():
                             help='Show tracebacks and other debugging information')
     subparsers = arg_parser.add_subparsers(title='Subcommands', dest='command',
                                            help='for help use build-ansible.py SUBCOMMANDS -h')
-    subcommands.pipe('init_parser', subparsers.add_parser)
+
+    for subcommand in subcommands:
+        subcommand.init_parser(subparsers.add_parser)
 
     if argcomplete:
         argcomplete.autocomplete(arg_parser)

packaging/pep517_backend/_backend.py

@@ -164,7 +164,6 @@ def get_requires_for_build_sdist(
     manpage_build_deps = [
         'docutils',  # provides `rst2man`
         'jinja2',  # used in `hacking/build-ansible.py generate-man`
-        'straight.plugin',  # used in `hacking/build-ansible.py` for subcommand
         'pyyaml',  # needed for importing in-tree `ansible-core` from `lib/`
     ] if build_manpages_requested else []
 

test/integration/targets/canonical-pep517-self-packaging/minimum-build-constraints.txt

@@ -13,4 +13,3 @@ docutils == 0.16
 Jinja2 == 3.0.0
 MarkupSafe == 2.0.0
 PyYAML == 5.3
-straight.plugin == 1.4.2

test/integration/targets/canonical-pep517-self-packaging/modernish-build-constraints.txt

@@ -8,4 +8,3 @@ docutils == 0.19
 Jinja2 == 3.1.2
 MarkupSafe == 2.1.2
 PyYAML == 6.0
-straight.plugin == 1.5.0  # WARNING: v1.5.0 doesn't have a Git tag / src