fix: report TLS trust source in apm doctor

src/apm_cli/commands/marketplace/doctor.py

@@ -195,6 +195,23 @@ def run_doctor(verbose: bool, *, logger_name: str = "doctor") -> int:
         )
     )
 
+    # Check 4: TLS trust source (informational)
+    try:
+        from ...core.tls_trust import describe_tls_trust
+
+        tls_source, tls_precedence = describe_tls_trust()
+        tls_detail = f"{tls_source}; precedence: {tls_precedence}"
+    except Exception as exc:
+        tls_detail = f"Unable to determine TLS trust source: {str(exc)[:60]}"
+    checks.append(
+        _DoctorCheck(
+            name="TLS trust",
+            passed=True,
+            detail=tls_detail,
+            informational=True,
+        )
+    )
+
     # Check 4: marketplace config presence + parsability
     project_root = Path.cwd()
     apm_path = project_root / "apm.yml"

src/apm_cli/core/tls_trust.py

@@ -95,6 +95,26 @@ def log_tls_trust_status() -> None:
         logger.debug(message, *args)
 
 
+def describe_tls_trust(env: Mapping[str, str] | None = None) -> tuple[str, str]:
+    """Return a user-facing trust source and precedence description."""
+    if _env_flag(_DISABLE_ENV_VAR, env):
+        source = f"bundled CA (certifi); {_DISABLE_ENV_VAR}=1 disables OS trust-store injection"
+    elif has_explicit_ca_override(env):
+        source = f"explicit CA bundle: {_explicit_ca_path(env)}"
+    elif _LAST_TLS_STATUS is not None:
+        message, args = _LAST_TLS_STATUS
+        rendered = message % args if args else message
+        source = rendered.removeprefix("TLS: ")
+    else:
+        source = "not selected yet; OS trust store preferred with certifi fallback"
+
+    precedence = (
+        "APM_DISABLE_TRUSTSTORE > REQUESTS_CA_BUNDLE/CURL_CA_BUNDLE > "
+        "APM_EXTRA_CA_BUNDLE (when supported) > OS trust store > certifi fallback"
+    )
+    return source, precedence
+
+
 def _env_flag(name: str, env: Mapping[str, str] | None = None) -> bool:
     environ = os.environ if env is None else env
     return environ.get(name, "").strip().lower() in _TRUTHY

tests/conftest.py

@@ -122,3 +122,28 @@ def _isolate_discovery_state():
     yield
     clear_discovery_cache()
     perf_stats.reset()
+
+
+@pytest.fixture(autouse=True)
+def _isolate_ssl_state():
+    """Restore process-global truststore injection between tests."""
+    import contextlib
+
+    try:
+        import truststore
+    except Exception:
+        truststore = None
+
+    if truststore is not None:
+        with contextlib.suppress(Exception):
+            truststore.extract_from_ssl()
+
+    from apm_cli.core.tls_trust import configure_process_tls_trust
+
+    configure_process_tls_trust.cache_clear()
+    yield
+    configure_process_tls_trust.cache_clear()
+
+    if truststore is not None:
+        with contextlib.suppress(Exception):
+            truststore.extract_from_ssl()

tests/unit/commands/test_marketplace_doctor.py

@@ -245,6 +245,27 @@ def test_no_token_informational(self, mock_run, runner, tmp_path, monkeypatch):
         assert result.exit_code == 0  # no token is informational, not a failure
         assert "unauthenticated" in result.output.lower() or "rate limit" in result.output.lower()
 
+    @patch("apm_cli.commands.marketplace.doctor.subprocess.run")
+    def test_tls_trust_source_is_reported(self, mock_run, runner, tmp_path, monkeypatch):
+        monkeypatch.chdir(tmp_path)
+        mock_run.side_effect = [
+            _make_run_result(0, stdout="git version 2.40.0"),
+            _make_run_result(0),
+        ]
+
+        with patch(
+            "apm_cli.core.tls_trust.describe_tls_trust",
+            return_value=(
+                "OS trust store (truststore)",
+                "APM_DISABLE_TRUSTSTORE > explicit bundle > OS trust store > certifi fallback",
+            ),
+        ):
+            result = runner.invoke(cli, ["doctor"])
+
+        assert result.exit_code == 0
+        assert "TLS trust" in result.output
+        assert "OS trust store" in result.output
+
 
 # ---------------------------------------------------------------------------
 # Check 4: marketplace.yml