Linux Pipe into Proxmox LXC?

I had to re-install my Proxmox box to another machine because the motherboard died.

I have this alias I'm trying to restore.

Code:

alias rdip='readip ; echo "-- ^ local - v VPN --" ; echo "curl icanhazip.com" > /mnt/dl/pipe ; sleep 1 ; tail -n 1 /mnt/ramdisk/pipe_out.txt '

Key bit:

Code:

echo "curl icanhazip.com" > /mnt/dl/pipe

What could possibly be in /mnt/dl/pipe ?? It appears by sending command to this pipe file, it executes in the LXC container.

My internet searching is failing me, only found a python script. Help me Bit-tech, you are my only hope

 

Ah okay, I found the script inside the LXC responsible:

Code:

#!/bin/bash
while true; do eval "$(cat /mnt/dl/pipe )" &> /mnt/ramdisk/pipe_out.txt; done

So inside the LXC there is a script constantly running, looking for commands in /mnt/dl/pipe.
Host (or anything has access to this mounted drive) write command into that file.
LXC script writes the return into pip_out.txt.
Host prints it out.

So it was working, except curl behaves differently in the pipe. I don't get the IP in pipe_out.txt, I get a load of stats.

Code:

 tail /mnt/ramdisk/pipe_out.txt
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
  0     0    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0

Any idea why?
Running the command ("curl icanhazip.com") directly in the LXC shell do return IP.

-----EDIT:
Found why, the hostpipe.sh script had &> instead of >.
Curl prints out the progress meter as stderr, which gets redirected into the txt file via &>

But for some reason using > does not print anything to the output text file. Empty.
Running curl without redirect do print out my IP.
Hum......?

 

Restored my alias by doing the following:

Code:

alias rdip='readip ; echo "-- ^ local - v VPN --" ; pct exec 201 /root/check_ip.sh ; sleep 1 ; tail -n 1 /mnt/ramdisk/pipe_out.txt '

Inside the LXC, simply put an executable script containing the following:

Code:

curl -s icanhazip.com > /mnt/ramdisk/pipe_out.txt

/mnt/ramdisk is mounted tmpfs on host, then passed through as mount point into LXC.
In lxc config file:

Code:

mp1: /mnt/ramdisk,mp=/mnt/ramdisk

Never figured out why curl wouldn't print into text file, probably due to some file permission error.