TTY inconsistency

[nixpig]

Appears to be inconsistency in TTY in brownie runtime compared to runc; also appears to be dependent on image.

---

brownie / alpine

~ $ docker run -it --rm --runtime brownie alpine

/ # ps -o pid,tty,comm
PID   TT     COMMAND
    1 136,1  sh
    7 136,1  ps

/ # ls -la /dev/pts
total 0
drwxr-xr-x    2 root     root             0 Dec 27 08:07 .
drwxrwxrwt    5 root     root           340 Dec 27 08:07 ..
c---------    1 root     root        5,   2 Dec 27 08:07 ptmx

runc / alpine

~ $ docker run -it --rm --runtime runc alpine

/ # ps -o pid,tty,comm
PID   TT     COMMAND
    1 136,0  sh
    7 136,0  ps

/ # ls -la /dev/pts
total 0
drwxr-xr-x    2 root     root             0 Dec 27 08:09 .
drwxr-xr-x    5 root     root           360 Dec 27 08:09 ..
crw--w----    1 root     tty       136,   0 Dec 27 08:09 0
crw-rw-rw-    1 root     root        5,   2 Dec 27 08:09 ptmx

brownie / ubuntu

~ $ docker run -it --rm --runtime brownie ubuntu

root@26e799317c8b:/# ps -o pid,tty,comm
    PID TT       COMMAND
      1 ?        bash
      9 ?        ps

root@26e799317c8b:/# ls -la /dev/pts
total 0
drwxr-xr-x 2 root root    0 Dec 27 08:10 .
drwxrwxrwt 5 root root  340 Dec 27 08:10 ..
c--------- 1 root root 5, 2 Dec 27 08:10 ptmx

runc / ubuntu

~ $ docker run -it --rm --runtime runc ubuntu

root@87c02b6e2ebc:/# ps -o pid,tty,comm
    PID TT       COMMAND
      1 pts/0    bash
      9 pts/0    ps

root@87c02b6e2ebc:/# ls -la /dev/pts
total 0
drwxr-xr-x 2 root root      0 Dec 27 08:11 .
drwxr-xr-x 5 root root    360 Dec 27 08:11 ..
crw--w---- 1 root tty  136, 0 Dec 27 08:11 0
crw-rw-rw- 1 root root   5, 2 Dec 27 08:11 ptmx