Fix bad return code in bash activation if hashing is disabled

If hashing is disabled in bash, the `hash` command will return a nonzero
return code. Since it is the last command in the script that return code
will also be the "return code" of the source command, so if anyone uses

source activate.sh || die horribly

having hashing disabled will ruin their day.

Fix this by overriding the return code of `hash` if it's bad.
Add tests to verify a good return code and try with and without hashing.

docs/changelog/2717.bugfix.rst

@@ -0,0 +1 @@
+Fix bad return code from activate.sh if hashing is disabled - by :user:'fenkes-ibm'.

src/virtualenv/activation/bash/activate.sh

@@ -84,4 +84,4 @@ pydoc () {
 # The hash command must be called to get it to forget past
 # commands. Without forgetting past commands the $PATH changes
 # we made may not be respected
-hash -r 2>/dev/null
+hash -r 2>/dev/null || true

tests/unit/activation/conftest.py

@@ -79,6 +79,7 @@ def __call__(self, monkeypatch, tmp_path):
             process = Popen(invoke, stdout=subprocess.PIPE, stderr=subprocess.STDOUT, env=env)
             raw_, _ = process.communicate()
             raw = raw_.decode()
+            assert process.returncode == 0, raw
         except subprocess.CalledProcessError as exception:
             output = exception.output + exception.stderr
             assert not exception.returncode, output  # noqa: PT017

tests/unit/activation/test_bash.py

@@ -7,7 +7,8 @@
 
 
 @pytest.mark.skipif(IS_WIN, reason="Github Actions ships with WSL bash")
-def test_bash(raise_on_non_source_class, activation_tester):
+@pytest.mark.parametrize("hashing_enabled", [True, False])
+def test_bash(raise_on_non_source_class, hashing_enabled, activation_tester):
     class Bash(raise_on_non_source_class):
         def __init__(self, session) -> None:
             super().__init__(
@@ -18,6 +19,11 @@ def __init__(self, session) -> None:
                 "sh",
                 "You must source this script: $ source ",
             )
+            self.deactivate += " || exit 1"
+            self._invoke_script.append("-h" if hashing_enabled else "+h")
+
+        def activate_call(self, script):
+            return super().activate_call(script) + " || exit 1"
 
         def print_prompt(self):
             return self.print_os_env_var("PS1")