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test: serialize the frontend acceptance stand-in's shared state #116

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test: serialize the frontend acceptance stand-in's shared state #116

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9 changes: 8 additions & 1 deletion tests/python/test_native_frontend_acceptance.py
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Original file line number Diff line number Diff line change
Expand Up @@ -22,11 +22,16 @@
# One stand-in serves as both hack-native and hack-v5 (by file name) over a shared state file.
# `up` refuses unless a prepared base is required, then stays in the foreground until `down`.
FAKE = r'''#!PYTHON
import json, os, pathlib, secrets, sys, time
import fcntl, json, os, pathlib, secrets, sys, time
here = pathlib.Path(__file__).parent
name = pathlib.Path(__file__).name
path = here / "state.json"
fault = os.environ.get("FAKE_FAULT", "")
# Invocations run concurrently (a foreground `up` while the driver polls `ps`). Each holds this
# exclusive lock across its read-modify-write of the shared state, so no invocation saves a stale
# copy over another's update; it is released only before a long wait.
lock = open(here / "state.lock", "a")
fcntl.flock(lock, fcntl.LOCK_EX)


def load():
Expand Down Expand Up @@ -86,6 +91,7 @@ def reply(body, code=0):
up_env={k: v for k, v in os.environ.items() if k.startswith("HACK_NATIVE_")})
state.setdefault("run", "r" + secrets.token_hex(8))
save(state)
fcntl.flock(lock, fcntl.LOCK_UN)
deadline = time.time() + 30
while time.time() < deadline:
time.sleep(0.02)
Expand All @@ -94,6 +100,7 @@ def reply(body, code=0):
sys.exit(3)
if argv[0] == "ps":
if fault == "ps-hang":
fcntl.flock(lock, fcntl.LOCK_UN)
time.sleep(10)
if state.get("foreground"):
reply({"status": "observed", "phase": "ready-observed", "backend": "native", "run": state["run"],
Expand Down
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