kitten @ ls: Return environ of foreground process

This is needed on macOS where we now run the shell via login and we
aren't allowed to read the environ of login because its setuid.

Fixes #6749

docs/changelog.rst

@@ -78,6 +78,8 @@ Detailed list of changes
 
 - Render Private Use Unicode symbols using two cells if the second cell contains a non-breaking space as well as a normal space
 
+- kitten @ ls: Return the environment of the foreground process instead of the initial child process (:iss:`6749`)
+
 
 0.30.1 [2023-10-05]
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

kitty/child.py

@@ -214,10 +214,11 @@ class Child:
         self.cwd = os.path.abspath(cwd)
         self.stdin = stdin
         self.env = env or {}
+        self.final_env:Dict[str, str] = {}
         self.is_default_shell = bool(self.argv and self.argv[0] == shell_path)
         self.should_run_via_run_shell_kitten = is_macos and self.is_default_shell
 
-    def final_env(self) -> Dict[str, str]:
+    def get_final_env(self) -> Dict[str, str]:
         from kitty.options.utils import DELETE_ENV_VAR
         env = default_env().copy()
         opts = fast_data_types.get_options()
@@ -273,8 +274,7 @@ class Child:
             os.set_inheritable(stdin_read_fd, True)
         else:
             stdin_read_fd = stdin_write_fd = -1
-        final_env = self.final_env()
-        env = tuple(f'{k}={v}' for k, v in final_env.items())
+        self.final_env = self.get_final_env()
         argv = list(self.argv)
         cwd = self.cwd
         if self.should_run_via_run_shell_kitten:
@@ -311,6 +311,7 @@ class Child:
                 argv = ['/usr/bin/login', '-f', '-l', '-p', user] + argv
         self.final_exe = which(argv[0]) or argv[0]
         self.final_argv0 = argv[0]
+        env = tuple(f'{k}={v}' for k, v in self.final_env.items())
         pid = fast_data_types.spawn(
             self.final_exe, cwd, tuple(argv), env, master, slave, stdin_read_fd, stdin_write_fd,
             ready_read_fd, ready_write_fd, tuple(handled_signals), kitten_exe(), opts.forward_stdio)

kitty/window.py

@@ -654,7 +654,7 @@ class Window:
             'pid': self.child.pid,
             'cwd': self.child.current_cwd or self.child.cwd,
             'cmdline': self.child.cmdline,
-            'env': self.child.environ,
+            'env': self.child.foreground_environ or self.child.environ or self.child.final_env,
             'foreground_processes': self.child.foreground_processes,
             'is_self': is_self,
             'at_prompt': self.at_prompt,