3 files changed, 75 insertions, 0 deletions
diff --git a/self-hosting-plugins/debputy-self-hosting.json b/self-hosting-plugins/debputy-self-hosting.json
new file mode 100644
index 0000000..fa02d72
--- /dev/null
+++ b/self-hosting-plugins/debputy-self-hosting.json
@@ -0,0 +1,4 @@
+{
+  "plugin-initializer": "initializer",
+  "api-compat-version": 1
+}
diff --git a/self-hosting-plugins/debputy_self_hosting.py b/self-hosting-plugins/debputy_self_hosting.py
new file mode 100644
index 0000000..4db4e05
--- /dev/null
+++ b/self-hosting-plugins/debputy_self_hosting.py
@@ -0,0 +1,61 @@
+import textwrap
+
+from debputy.plugin.api import (
+    DebputyPluginInitializer,
+    VirtualPath,
+    BinaryCtrlAccessor,
+    PackageProcessingContext,
+)
+from debputy.util import POSTINST_DEFAULT_CONDITION
+
+
+def _maintscript_generator(
+    _path: VirtualPath,
+    ctrl: BinaryCtrlAccessor,
+    context: PackageProcessingContext,
+) -> None:
+    maintscript = ctrl.maintscript
+
+    # When `debputy` becomes a stand-alone package, it should have these maintscripts instead of dh-debputy
+    # Admittedly, I hope to get rid of this plugin before then, but ...
+    assert context.binary_package.name != "debputy", "Update the self-hosting plugin"
+    dirname = "/usr/share/debputy"
+
+    if context.binary_package.name == "dh-debputy":
+        ctrl.dpkg_trigger("interest-noawait", dirname)
+        maintscript.unconditionally_in_script(
+            "postinst",
+            textwrap.dedent(
+                f"""\
+            if {POSTINST_DEFAULT_CONDITION} || [ "$1" = "triggered" ] ; then
+                # Ensure all plugins are byte-compiled (plus uninstalled plugins are cleaned up)
+                py3clean {dirname}
+                if command -v py3compile >/dev/null 2>&1; then
+                    py3compile {dirname}
+                fi
+                if command -v pypy3compile >/dev/null 2>&1; then
+                    pypy3compile {dirname} || true
+                fi
+            fi
+        """
+            ),
+        )
+        maintscript.unconditionally_in_script(
+            "prerm",
+            textwrap.dedent(
+                f"""\
+        if command -v py3clean >/dev/null 2>&1; then
+            py3clean {dirname}
+        else
+            find {dirname}/ -type d -name __pycache__ -empty -print0 | xargs --null --no-run-if-empty rmdir
+        fi
+        """
+            ),
+        )
+
+
+def initializer(api: DebputyPluginInitializer) -> None:
+    api.metadata_or_maintscript_detector(
+        "debputy-self-hosting",
+        _maintscript_generator,
+    )
diff --git a/self-hosting-plugins/debputy_self_hosting_test.py b/self-hosting-plugins/debputy_self_hosting_test.py
new file mode 100644
index 0000000..c8da6cc
--- /dev/null
+++ b/self-hosting-plugins/debputy_self_hosting_test.py
@@ -0,0 +1,10 @@
+from debputy.plugin.api.test_api import (
+    initialize_plugin_under_test,
+    build_virtual_file_system,
+)
+
+
+def test_plugin():
+    plugin = initialize_plugin_under_test()
+    fs = build_virtual_file_system([])
+    plugin.run_metadata_detector("debputy-self-hosting", fs)