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-rw-r--r--test/selfmount.py10
1 files changed, 10 insertions, 0 deletions
diff --git a/test/selfmount.py b/test/selfmount.py
index 86c32fa8..dd59083c 100644
--- a/test/selfmount.py
+++ b/test/selfmount.py
@@ -176,6 +176,16 @@ def run(binary):
held = run(f"for i in $(seq 40); do cat {mount}/pane/{first}/event > /dev/null & done; "
f"sleep 1; timeout 10 cat {mount}/layout > /dev/null; st=$?; kill $(jobs -p); exit $st\n".encode())
check(held == '0', f'cat layout answers beside 40 held event reads ({held!r})')
+ # fs.md's follow recipe, as written, with plain cat, its output
+ # a pipe (where coreutils cat splices): it hears a record made
+ # after it started.
+ recipe = Path(f'/tmp/{name}.follow')
+ ran = run(f"exec 3<>{mount}/log; echo follow >&3; "
+ f"(sleep 1; echo 'Msg recipe-heard' > {mount}/exec) & "
+ f"timeout 5 cat <&3 | cat > {recipe}; exit 0\n".encode())
+ followed = recipe.read_text() if recipe.exists() else ''
+ recipe.unlink(missing_ok=True)
+ check(ran == '0' and 'recipe-heard' in followed, f'the log follow recipe with cat hears a new record ({followed[-120:]!r})')
client.write('/exec', b'Msg still here\n')
text = ''.join(cell[0] for cell in client.screen()['cells'])
check('still here' in text, 'the editor answers after all of that')