Hi! I've run into an issue where I get the following error:
```
"{binary_path} appears to have been moved or deleted since this application
was launched. Continouation from this state is impossible. Exiting now."
```
Context:
- The application starts at a scheduled time;
- Upon an external event, the application starts a background process using
the `multiprocessing` library
- In between the two, a deploy can alter the symlink to the binary by
removing or updating it
- If the deploy has happened, the background process cannot start and dies
with the error from above
>From what I've read, the error is triggered when the background process
tries to import python modules which it cannot find.
What I'm trying to understand is why that happens if the background process
is started using the `fork` method? And then, as a follow-up, is there
anything that can be done to mitigate this?
The parent process works fine even though the binary has been altered. I
suppose it is running off an temp directory? Could the background process
also be started using it?
Code to reproduce:
```
import multiprocessing as mp
import sys, time, platform, pathlib
import faulthandler
EXE = pathlib.Path(sys.executable) # PyInstaller onefile
HB = pathlib.Path.cwd() / "heartbeat.log"
LOG = pathlib.Path.cwd() / "test.log"
def log(msg):
LOG.write_text((LOG.read_text() if LOG.exists() else "") + msg + "\n")
def worker():
log("worker: start")
for _ in range(20):
HB.write_text((HB.read_text() if HB.exists() else "") + msg + "\n")
time.sleep(0.5)
log("worker: done")
def try_delete_target(path: pathlib.Path):
try:
path.unlink()
log(f"deleter: successfully unlinked {path}")
except Exception as e:
log(f"deleter: failed to unlink {path}: {type(e).__name__}: {e}")
def spawn_worker(func):
mp.freeze_support()
log(f"parent: {mp.get_start_method()}")
p = mp.Process(target=func)
p.start()
return p
def main():
faulthandler.enable(open("faulthandler.txt", "w"))
LOG.write_text("")
HB.write_text("")
log(f"parent: exe path = {EXE}")
log(f"parent: platform = {platform.platform()}")
try_delete_target(EXE)
spawn_worker(worker)
log("parent: spawned background worker")
for i in range(6):
log(f"parent: tick {i}")
time.sleep(1)
log("parent: exiting")
if __name__ == "__main__":
main()
```
The platform I'm running this on is Linux. Would really appreciate some
help and intuition on this one, thanks! :)
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