unl0kr: simplify the crash edge-case handling

hosts/common/programs/unl0kr/default.nix

@@ -25,17 +25,7 @@ let
       #   but modified to not leak pword to CLI
       # - implement some sort of watchdog (e.g. detect spawned children?)
       # - set a timeout at the outer scope (which gets canceled upon successful login)
-      # eval 'redirect-tty "/dev/${tty}" unl0kr ; sleep 5 ; redirect-tty "/dev/${tty}" echo ""' &
-      # redirect-tty "/dev/${tty}" unl0kr &
-      # unl0kr_pid=$!
-      # # login -p: preserve environment
-      # login -p ${cfg.config.user} &
-      # login_pid=$!
-      # # wait for unl0kr, and if it succeeds then hand control fully to `login`.
-      # # otherwise, exit, implicitly killing `login` and probably restarting the service
-      # wait "$unl0kr_pid" && wait "$login_pid"
-
-      redirect-tty "/dev/${tty}" unl0kr &
+      bash -c 'redirect-tty "/dev/${tty}" unl0kr ; sleep 2 ; redirect-tty "/dev/${tty}" echo ""' &
       login -p ${cfg.config.user}
     '';
   };

hosts/common/programs/unl0kr/redirect-tty

@@ -13,7 +13,6 @@ import fcntl
 import subprocess
 import sys
 import termios
-import time
 
 def write_to(text: bytes, dest_path: str) -> None:
     with open(dest_path, "w") as f:
@@ -24,15 +23,7 @@ def main(argv: list[str]):
     dest_path = argv[1]
     cmd = argv[2:]
 
-    try:
-        cmd_output = subprocess.check_output(cmd)
-    except Exception as e:
-        # command failed, somehow.
-        # sleep, to ensure `login` has some time to start
-        # then send it an empty newline to force it to fail
-        time.sleep(1)
-        write_to(b"\n", dest_path)
-        raise
+    cmd_output = subprocess.check_output(cmd)
     write_to(cmd_output, dest_path)
 
 if __name__ == "__main__":