Enumerate installed packages & versions in the log as part of environment info.

src/debugpy/common/log.py

@@ -279,7 +279,7 @@ def prefixed(format_string, *args, **kwargs):
         _tls.prefix = old_prefix
 
 
-def describe_environment(header):
+def get_environment_description(header):
     import sysconfig
     import site  # noqa
 
@@ -342,9 +342,31 @@ def describe_environment(header):
     report_paths("os.__file__")
     report_paths("threading.__file__")
     report_paths("debugpy.__file__")
+    report("\n")
 
-    result = "".join(result).rstrip("\n")
-    info("{0}", result)
+    importlib_metadata = None
+    try:
+        import importlib_metadata
+    except ImportError:
+        try:
+            from importlib import metadata as importlib_metadata
+        except ImportError:
+            pass
+    if importlib_metadata is None:
+        report("Cannot enumerate installed packages - missing importlib_metadata.")
+    else:
+        report("Installed packages:\n")
+        try:
+            for pkg in importlib_metadata.distributions():
+                report("    {0}=={1}\n", pkg.name, pkg.version)
+        except Exception:
+            swallow_exception("Error while enumerating installed packages.")
+
+    return "".join(result).rstrip("\n")
+
+
+def describe_environment(header):
+    info("{0}", get_environment_description(header))
 
 
 stderr = LogFile(

tests/pytest_fixtures.py

@@ -69,6 +69,7 @@ def test_wrapper(request, long_tmpdir):
         with log.to_file(prefix="tests"):
             timestamp.reset()
             log.info("{0} started.", request.node.nodeid)
+            log.describe_environment("Environment:")
             try:
                 yield
             finally:

tests/pytest_hooks.py

@@ -36,7 +36,7 @@ def pytest_configure(config):
 
 
 def pytest_report_header(config):
-    log.describe_environment(f"Test environment for tests-{os.getpid()}")
+    return log.get_environment_description(f"Test environment for tests-{os.getpid()}")
 
 
 @pytest.hookimpl(hookwrapper=True, tryfirst=True)

tests/requirements.txt

@@ -7,6 +7,7 @@ pytest-timeout
 
 ## Used by test helpers:
 
+importlib_metadata
 psutil
 
 ## Used in Python code that is run/debugged by the tests: