Use importlib in Python >= 3.12, add Conan v1 deprecation message (#1…

…4841)

* Use importlib in Python 3.12

* Add Conan 1 deprecation warning

* Move warning to only show in create/install/build

conans/client/command.py

@@ -4,6 +4,7 @@
 import os
 import signal
 import sys
+import textwrap
 from argparse import ArgumentError
 from difflib import get_close_matches
 
@@ -318,6 +319,7 @@ def create(self, *args):
         that the package has been created correctly. Check 'conan test' command
         to know more about 'test_folder' project.
         """
+        self._warn_conan_version()
         parser = argparse.ArgumentParser(description=self.create.__doc__,
                                          prog="conan create",
                                          formatter_class=SmartFormatter)
@@ -469,6 +471,7 @@ def install(self, *args):
         the package is installed, Conan will write the files for the specified
         generators.
         """
+        self._warn_conan_version()
         parser = argparse.ArgumentParser(description=self.install.__doc__,
                                          prog="conan install",
                                          formatter_class=SmartFormatter)
@@ -859,7 +862,7 @@ def build(self, *args):
         using a build helper, like CMake(), the --package-folder will be
         configured as the destination folder for the install step.
         """
-
+        self._warn_conan_version()
         parser = argparse.ArgumentParser(description=self.build.__doc__,
                                          prog="conan build",
                                          formatter_class=SmartFormatter)
@@ -2177,6 +2180,12 @@ def _warn_python_version(self):
                               front=Color.BRIGHT_RED)
             self._out.writeln("*"*width, front=Color.BRIGHT_RED)
 
+    def _warn_conan_version(self):
+        width = 70
+        self._out.writeln(textwrap.fill("Conan 1 is on a deprecation path, "
+                                        "please consider migrating to Conan 2", width),
+                          front=Color.BRIGHT_YELLOW)
+
     def run(self, *args):
         """HIDDEN: entry point for executing commands, dispatcher to class
         methods

conans/client/loader.py

@@ -1,5 +1,4 @@
 import fnmatch
-import imp
 import inspect
 import os
 import re
@@ -40,6 +39,9 @@ def __init__(self, runner, output, python_requires, generator_manager=None, pyre
         sys.modules["conans"].python_requires = python_requires
         self._cached_conanfile_classes = {}
         self._requester = requester
+        if sys.version_info.major >= 3 and sys.version_info.minor >= 12:
+            from importlib import invalidate_caches
+            invalidate_caches()
 
     def load_basic(self, conanfile_path, lock_python_requires=None, user=None, channel=None,
                    display=""):
@@ -439,8 +441,15 @@ def _parse_conanfile(conan_file_path):
             old_dont_write_bytecode = sys.dont_write_bytecode
             try:
                 sys.dont_write_bytecode = True
-                # FIXME: imp is deprecated in favour of implib
-                loaded = imp.load_source(module_id, conan_file_path)
+                # imp is deprecated in favour of importlib, removed in 3.12
+                if sys.version_info.major >= 3 and sys.version_info.minor >= 12:
+                    from importlib import util as imp_util
+                    spec = imp_util.spec_from_file_location(module_id, conan_file_path)
+                    loaded = imp_util.module_from_spec(spec)
+                    spec.loader.exec_module(loaded)
+                else:
+                    import imp
+                    loaded = imp.load_source(module_id, conan_file_path)
                 sys.dont_write_bytecode = old_dont_write_bytecode
             except ImportError:
                 version_txt = _get_required_conan_version_without_loading(conan_file_path)