Fix sdist directory name extraction in _prepare_sdist

str.rstrip() treats its argument as a set of characters, not a
suffix string.  For a .tar.gz archive, archive.suffix returns
'.gz', so rstrip('.gz') strips the characters {'.', 'g', 'z'}
from the right, giving 'package-1.0.tar' instead of 'package-1.0'.

For .zip files the character-stripping behavior can be even worse
— e.g. 'zipp-24.0.0.zip'.rstrip('.zip') over-strips because the
package name itself ends with characters in the strip set.

Replace rstrip with proper suffix matching against known archive
extensions.

Author: bysiber

pr_body_1.md

@@ -0,0 +1,29 @@
+## Problem
+
+`Executor._remove()` catches `CalledProcessError`, but `run_pip()` never raises that — it wraps it inside `EnvCommandError`:
+
+```python
+def run_pip(self, *args, **kwargs) -> int:
+    try:
+        self._env.run_pip(*args, **kwargs)
+    except EnvCommandError as e:
+        ...
+        raise  # re-raises EnvCommandError, not CalledProcessError
+    return 0
+```
+
+So the handler in `_remove()`:
+
+```python
+except CalledProcessError as e:
+    if "not installed" in str(e):
+        return 0
+```
+
+is dead code. When pip reports "not installed", the `EnvCommandError` propagates to `_execute_operation`, which treats it as a fatal error and sets `self._shutdown = True`, aborting the entire installation.
+
+This can happen during `poetry update` if a package was already removed externally (e.g. `pip uninstall` by hand).
+
+## Fix
+
+Catch `EnvCommandError` instead of `CalledProcessError`, and remove the now-unused import.

src/poetry/installation/chef.py

@@ -108,7 +108,14 @@ def _prepare_sdist(
             if len(elements) == 1 and elements[0].is_dir():
                 sdist_dir = elements[0]
             else:
-                sdist_dir = archive_dir / archive.name.rstrip(suffix)
+                # Remove known archive suffixes properly — rstrip treats
+                # its argument as a character set, not a suffix string.
+                stem = archive.name
+                for ext in (".tar.gz", ".tar.bz2", ".tar.xz", ".tar", ".zip"):
+                    if stem.endswith(ext):
+                        stem = stem[: -len(ext)]
+                        break
+                sdist_dir = archive_dir / stem
                 if not sdist_dir.is_dir():
                     sdist_dir = archive_dir