unshare --pid --fork, the
nsenter command must attach to the child pid not the
unshare pid to get to the right pid namespace.
I can get unshare's pid as follows:
unshare --pid --mount --fork --mount-proc bash & echo PID: $! fg
but I need
unshare's child's pid (2914003) to enter the right namespace:
ps wwfuax | grep -A1 unshare 2914002 pts/4 S 0:00 | \_ unshare --pid --mount --fork --mount-proc bash 2914003 pts/4 S+ 0:00 | \_ bash
nsenter -t 2914003
This does not:
nsenter -t 2914002
I was hoping for some kind of option like
unshare --show-child-pid but there isn't.
What is a nice reliable way to get unshare's child's pid?
pgrep -P pid-of-parent-process-herefind the right pid (or pids)?
pgrep -o -P pid-of-parent-process-herewill give just one: the first (which will be pid 1 inside)