pyrasite-shell hangs / does not start

[mxmlnkn]

On one shell I start: python3 -c 'import time; time.sleep(60)'.

In another shell, I try: pyrasite-shell 681228. Nothing happens, so I try to cancel it after a while and get:

^CTraceback (most recent call last):
  File "/home/user/.local/bin/pyrasite-shell", line 8, in <module>
    sys.exit(shell())
             ^^^^^^^
  File "/home/user/.local/lib/python3.12/site-packages/pyrasite/tools/shell.py", line 30, in shell
    ipc.connect()
  File "/home/user/.local/lib/python3.12/site-packages/pyrasite/ipc.py", line 95, in connect
    self.wait()
  File "/home/user/.local/lib/python3.12/site-packages/pyrasite/ipc.py", line 151, in wait
    (clientsocket, address) = self.server_sock.accept()
                              ^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3.12/socket.py", line 295, in accept
    fd, addr = self._accept()
               ^^^^^^^^^^^^^^
KeyboardInterrupt

I am using Ubuntu 24.04 with Python 3.12 and gdb 15.0.

[lmagyar]

Have you figured out a solution? I have the exact same error message.
I'm running it in a container.

[mxmlnkn]

Unfortunately, no. I have not used it since. I also have no alternative.

[lmagyar]

Based on #75 (comment) I applied the changes from this commit d1e2301 to the injector.py with vi, and it works!

OK, it gave mi an error on start, that "ps: unrecognized option: no-heading", but started up, and I was able to tinker with the variables in a running python app.

docker exec -it `docker ps -q -f name=xxxxxxxx` /bin/bash
apk add --no-cache gdb
pip install pyrasite
vi $(pip show pyrasite | grep Location: | awk '{ print $2 }')/pyrasite/injector.py
pyrasite-shell xxxx

[lmagyar]

Now I have a nice script for it, installs gdb and pyrasite if they are not installed. In fact it uses pyrasite-ng, that works without a patch.

If you are using it in an eg. Alpine based container where ps is implemented with BusyBox, you should "patch" ps also (see below), if you have "real" ps, skip that part.

#!/usr/bin/env bash

apk add --upgrade --no-cache --quiet --no-progress gdb

if ! pip freeze | grep -Eq '^pyrasite-ng=='; then pip install --root-user-action ignore --no-input --quiet pyrasite-ng; fi

mkdir -p /tmp/pyrasite-fake-bin
cat > /tmp/pyrasite-fake-bin/ps <<"EOPS"
#!/usr/bin/env bash
if [[ "$#" == "5" && "${1:-}" == "--no-heading" && "${2:-}" == "-o" && "${3:-}" == "cmd=" && "${4:-}" == "-p" ]]; then
  /bin/ps -o pid=,comm= | grep -E "^\s*$5\s+" | awk '{ print $2 }'
else
  /bin/ps "$@"
fi
EOPS
chmod 755 /tmp/pyrasite-fake-bin/ps

PATH=/tmp/pyrasite-fake-bin:$PATH pyrasite-shell xxxx

And a python script, if you have to call async functions.

def wait(coro):
  event = threading.Event()
  task = asyncio.create_task(coro) # if your target system has some special loop, use their create_task()
  task.add_done_callback(lambda _: event.set())
  event.wait()
  return task.result()

wait(some_async_function())