#22158 `pants run --debug-adapter` fails with `No such file or directory: 'debugpy.pex/PEX-INFO'` after clearing named caches Issue created by huonw Describe the bug This sequence of actions results in an exception: 1.

pants run --debug-adapter path/to/some/file.py

2. clear the

[GLOBAL].named_caches_dir

cache (as one might do if they're using too much space) 3.

pants run --debug-adapter path/to/some/file.py

again, with no changes to code In this case, the second invocation fails with an error like:

16:24:16.96 [INFO] Launching debug adapter at '127.0.0.1:5678', which will wait for a client connection...
Traceback (most recent call last):
  File "<frozen runpy>", line 198, in _run_module_as_main
  File "<frozen runpy>", line 88, in _run_code
  File "/private/var/folders/sv/vd266m4d4lvctgs2wpnhjs9w0000gn/T/pants-sandbox-ahVg0t/./src.pex/__main__.py", line 236, in <module>
    result, should_exit, is_globals = boot(
                                      ^^^^^
  File "/private/var/folders/sv/vd266m4d4lvctgs2wpnhjs9w0000gn/T/pants-sandbox-ahVg0t/./src.pex/__main__.py", line 207, in boot
    venv_dir = __maybe_run_venv__(
               ^^^^^^^^^^^^^^^^^^^
  File "/private/var/folders/sv/vd266m4d4lvctgs2wpnhjs9w0000gn/T/pants-sandbox-ahVg0t/./src.pex/__main__.py", line 127, in __maybe_run_venv__
    venv_root_dir = venv_dir(
                    ^^^^^^^^^
  File "/private/var/folders/sv/vd266m4d4lvctgs2wpnhjs9w0000gn/T/pants-sandbox-ahVg0t/src.pex/.bootstrap/pex/variables.py", line 854, in venv_dir
  File "/private/var/folders/sv/vd266m4d4lvctgs2wpnhjs9w0000gn/T/pants-sandbox-ahVg0t/src.pex/.bootstrap/pex/variables.py", line 852, in add_pex_path_items
  File "/private/var/folders/sv/vd266m4d4lvctgs2wpnhjs9w0000gn/T/pants-sandbox-ahVg0t/src.pex/.bootstrap/pex/pex_info.py", line 87, in from_pex
FileNotFoundError: [Errno 2] No such file or directory: 'debugpy.pex/PEX-INFO'

Reproducer: cd $(mktemp -d) local_store=$(mktemp -d) named_caches=$(mktemp -d) cat > pants.toml <<EOF [GLOBAL] pants_version = "2.27.0.dev1" backend_packages = ["pants.backend.python"] local_store_dir = "$local_store" named_caches_dir = "$named_caches" [python] interpreter_constraints = ["==3.10.*"] EOF echo "python_sources(name='src')" > BUILD touch foo.py # Start the scheduler pants version # First run: pants run --debug-adapter ./foo.py & # (wait for port to open, i.e. the debug adapter to start) while ! nc -z localhost 5678; do sleep 0.5; done # now kill the first run, which is just waiting on the debug adapter to connect kill -INT %1 # clear the caches: rm -rf "$named_caches" # BUG: second run, fails with: No such file or directory: 'debugpy.pex/PEX-INFO' pants run --debug-adapter ./foo.py Pants version 2.27.0.dev1, likely many many more OS macOS Additional info Add any other information about the problem here, such as attachments or links to gists, if relevant. pantsbuild/pants