Edit's w to a file changed on disk since read is refused once, as Save is (w again to overwrite), the rest of an X/'/w written and the refused named; Edit filters get a pane command's environment ($PARDES_MOUNT, $PARDES_9P, $PARDES_PID, $winid); an Edit with no commands runs beside one whose commands run unless it touches a file that one changes, refused busy (EBUSY) as is a second Edit with commands

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

1 files changed, 7 insertions, 0 deletions

diff --git a/test/selfmount.py b/test/selfmount.py
index c8a81df9..347093e1 100644
--- a/test/selfmount.py
+++ b/test/selfmount.py
@@ -307,6 +307,13 @@ def run(binary):
             ran = run(f"echo 'Edit $ < cat {mount}/pane/{edited}/body' > {mount}/pane/{edited}/ctl\n".encode())
             check(ran == '0' and client.read(f'/pane/{edited}/body') == b'apple\npear\napple\npear\n',
                   f'an Edit whose command reads the session through its mount ({ran!r})')
+            # A filter gets what a pane's command gets: the session's mount,
+            # socket and pid.
+            env_pane = int(client.read('/pane/new'))
+            ran = run(f"echo 'Edit $ < printf \"%s|%s|%s\" \"$PARDES_MOUNT\" \"$PARDES_9P\" \"$PARDES_PID\"' > {mount}/pane/{env_pane}/ctl\n".encode())
+            got_env = client.read(f'/pane/{env_pane}/body').decode().split('|')
+            check(ran == '0' and len(got_env) == 3 and got_env[0] == mount and got_env[1] == sock and got_env[2].isdigit(),
+                  f'an Edit filter has $PARDES_MOUNT, $PARDES_9P and $PARDES_PID ({got_env!r})')
             # An interrupted Edit write is flushed: its command is stopped and
             # nothing changes, and the next Edit runs.
             flushed = Path(f'/tmp/{name}.flushed')