1 files changed, 50 insertions, 4 deletions
diff --git a/src/debputy/analysis/debian_dir.py b/src/debputy/analysis/debian_dir.py
index 68a5c1b..d63b0c9 100644
--- a/src/debputy/analysis/debian_dir.py
+++ b/src/debputy/analysis/debian_dir.py
@@ -15,6 +15,7 @@ from typing import (
     Iterator,
     TypedDict,
     NotRequired,
+    FrozenSet,
 )
 
 from debputy.analysis import REFERENCE_DATA_TABLE
@@ -277,12 +278,49 @@ def _kpf_install_pattern(
     return ppkpf.info.get("install_pattern")
 
 
+def _parse_dh_cmd_list(
+    cmd_list: Optional[List[Union[Mapping[str, Any], object]]]
+) -> Iterable[str]:
+    if not isinstance(cmd_list, list):
+        return
+
+    for command in cmd_list:
+        if not isinstance(command, dict):
+            continue
+        command_name = command.get("command")
+        if isinstance(command_name, str):
+            yield command_name
+
+
+def _resolve_active_and_inactive_dh_commands(
+    dh_rules_addons: Iterable[str],
+) -> Tuple[FrozenSet[str], FrozenSet[str]]:
+    cmd = ["dh_assistant", "list-commands", "--output-format=json"]
+    if dh_rules_addons:
+        addons = ",".join(dh_rules_addons)
+        cmd.append(f"--with={addons}")
+    try:
+        output = subprocess.check_output(
+            cmd,
+            stderr=subprocess.DEVNULL,
+        )
+    except (subprocess.CalledProcessError, FileNotFoundError):
+        return frozenset(), frozenset()
+    else:
+        result = json.loads(output)
+        active_commands = frozenset(_parse_dh_cmd_list(result.get("commands")))
+        disabled_commands = frozenset(
+            _parse_dh_cmd_list(result.get("disabled-commands"))
+        )
+        return active_commands, disabled_commands
+
+
 def _resolve_debhelper_config_files(
     debian_dir: VirtualPath,
     binary_packages: Mapping[str, BinaryPackage],
     debputy_plugin_metadata: DebputyPluginMetadata,
     dh_ppf_docs: Dict[str, PluginProvidedKnownPackagingFile],
-    dh_rules_addons: Iterable[str],
+    dh_rules_addons: Sequence[str],
     dh_compat_level: int,
     saw_dh: bool,
 ) -> Tuple[List[PackagerProvidedFile], Optional[object], int]:
@@ -311,6 +349,7 @@ def _resolve_debhelper_config_files(
             "config-files", []
         )
         issues = result.get("issues")
+    active_commands, _ = _resolve_active_and_inactive_dh_commands(dh_rules_addons)
     for config_file in config_files:
         if not isinstance(config_file, dict):
             continue
@@ -369,6 +408,8 @@ def _resolve_debhelper_config_files(
                 else:
                     continue
                 is_active = command.get("is-active", True)
+                if is_active is None and command_name in active_commands:
+                    is_active = True
                 if not isinstance(is_active, bool):
                     continue
                 if is_active:
@@ -396,6 +437,13 @@ def _resolve_debhelper_config_files(
             "packageless_is_fallback_for_all_packages",
             False,
         )
+        has_active_command = (
+            ppkpf.info.get("has_active_command", False) if saw_dh else False
+        )
+        if not has_active_command:
+            dh_cmds = ppkpf.info.get("debhelper_commands")
+            if dh_cmds:
+                has_active_command = any(c in active_commands for c in dh_cmds)
         dh_ppfs[stem] = _fake_PPFClassSpec(
             debputy_plugin_metadata,
             stem,
@@ -404,9 +452,7 @@ def _resolve_debhelper_config_files(
             default_priority=default_priority,
             post_formatting_rewrite=post_formatting_rewrite,
             packageless_is_fallback_for_all_packages=packageless_is_fallback_for_all_packages,
-            has_active_command=(
-                ppkpf.info.get("has_active_command", False) if saw_dh else False
-            ),
+            has_active_command=has_active_command,
         )
     all_dh_ppfs = list(
         flatten_ppfs(