A shell given a directory is not taken to be in this process's before it has spoken, so it logs no rename to the session's and back

Each host read /proc/<pid>/cwd right after forking the shell and at every
frame after; before the shell's chdir that says this process's directory,
a rename to it, then the real one a frame later, a rename back. A shell
given a directory is named by it already (newShell) and is no longer
asked at fork; and until it has printed anything, an answer naming this
process's directory is not taken.

Co-Authored-By: Claude Opus 5.5 <[email protected]>

1 files changed, 21 insertions, 0 deletions

diff --git a/test/fs.py b/test/fs.py
index 89801a71..d2cd631c 100644
--- a/test/fs.py
+++ b/test/fs.py
@@ -494,6 +494,26 @@ def unattended_messages_expire(binary):
             assert not shown(), 'an unattended message outlived MessageLinger'
 
 
+def new_terminals_named_once(binary):
+    """A terminal started outside the session's directory is named by that
+    directory from its `new` on: no rename to the session's and back."""
+    with tempfile.TemporaryDirectory(prefix='pardes-names-') as directory:
+        root = Path(directory)
+        (root / 'sub').mkdir()
+        with session(binary, root, 'names') as (client, _):
+            made = [look(client, str(root / 'sub'))]
+            before = {int(row.split()[0]) for row in client.read('/index').splitlines()}
+            client.write('/pane/1/ctl', b'Tty\n')
+            if shutil.which('fish'):
+                client.write('/pane/1/ctl', b'Tty fish\n')
+            made += [s for s in (int(row.split()[0]) for row in client.read('/index').splitlines()) if s not in before]
+            time.sleep(1.5)  # their shells start and say where they are
+            log = client.read('/log').decode()
+            for serial in made:
+                assert f'\nrename {serial} ' not in '\n' + log, (serial, log)
+                assert f'\nnew {serial} {root}' in '\n' + log, (serial, log)
+
+
 def python_repl_runs_one_line(binary):
     """A one-line exec sent to Python's own REPL (3.13's pyrepl, which asks
     for bracketed paste) runs at once, with no second Enter: the Enter
@@ -610,6 +630,7 @@ def test(binary, quic=False):
     run_file(binary)
     exit_answers(binary)
     unattended_messages_expire(binary)
+    new_terminals_named_once(binary)
     python_repl_runs_one_line(binary)
     signal_cleans_up(binary)
     for options, message in [