Cthulhu is no longer a fork. Now it is a screen reader written in Golang.

internal/tentacle/testdata/resource_peer.py

@@ -0,0 +1,63 @@
+"""Private cgroup fixture. Never run resource commands outside a bounded group."""
+
+import json
+import os
+import time
+
+
+allocations = []
+for line in iter(input, None):
+    message = json.loads(line)
+    method = message["method"]
+    if method == "initialize":
+        params = message["params"]
+        result = {
+            "protocol": params["protocol"],
+            "session": params["session"],
+            "commands": [{"id": "echo", "title": "Resource fixture", "description": ""}],
+        }
+    elif method == "initialized":
+        continue
+    elif method == "shutdown":
+        break
+    elif method == "command.invoke":
+        action = message["params"]["arguments"].get("action", "location")
+        if action == "detach":
+            childPid = os.fork()
+            if childPid == 0:
+                os.setsid()
+                time.sleep(300)
+                os._exit(0)
+            # Synchronize with the detach; inherited stdout stays open.
+            while os.getsid(childPid) != childPid:
+                time.sleep(0.001)
+            result = childPid
+        elif action == "tasks":
+            childPids = []
+            for _ in range(96):
+                try:
+                    childPid = os.fork()
+                except BlockingIOError:
+                    break
+                if childPid == 0:
+                    time.sleep(300)
+                    os._exit(0)
+                childPids.append(childPid)
+            result = len(childPids)
+        elif action == "memory":
+            allocation = bytearray(message["params"]["arguments"]["bytes"])
+            for offset in range(0, len(allocation), 4096):
+                allocation[offset] = 1
+            allocations.append(allocation)
+            result = True
+        elif action == "cpu":
+            result = True
+        else:
+            with open("/proc/self/cgroup", encoding="ascii") as source:
+                result = source.read().strip()
+    else:
+        raise RuntimeError("Unexpected method")
+    print(json.dumps({"jsonrpc": "2.0", "id": message["id"], "result": result}), flush=True)
+    if method == "command.invoke" and action == "cpu":
+        while True:
+            pass