Fix wrong activated PATH in micromamba shell (#2722)

* Fix wrong activated PATH in micromamba shell

* Add PATH check for shell activation

* Simplify stdout check in shell test

micromamba/src/shell.cpp

@@ -339,7 +339,7 @@ namespace
                     };
 
                     exit(mamba::run_in_environment(
-                        Context::instance().prefix_params.root_prefix,
+                        Context::instance().prefix_params.target_prefix,
                         { get_shell() },
                         ".",
                         static_cast<int>(STREAM_OPTIONS::ALL_STREAMS),

micromamba/tests/test_shell.py

@@ -296,3 +296,14 @@ def test_shell_run_SHELL(self, prefix_selector, tmp_path):
             env={**os.environ, "SHELL": script_path},
         )
         assert ret.returncode == 42
+
+    def test_shell_run_activated(self):
+        """Verify environment properly activated in `micromamba shell`."""
+        skip_if_shell_incompat("bash")
+        create("-n", self.env_name)
+        stdout = subprocess.check_output(
+            [get_umamba(), "shell", "-n", self.env_name],
+            input="echo $PATH",
+            text=True,
+        )
+        assert self.env_name in stdout.split(os.pathsep)[0]