[Bug 1551960] Re: lxc-attach does not work any more with input redirection

[Martin Pitt]

I locally applied https://github.com/lxc/lxc/commit/12752e2 to our
current package and built it. Now it looks better:

# lxc-attach -n a runlevel
N 5
# lxc-attach -n a runlevel </dev/null
N 5
# lxc-attach -n a runlevel </dev/null 2>/dev/null
N 5
# lxc-attach -n a runlevel </dev/null 2>/dev/null | cat

So redirecting stdin only now does not show this
"lxc_console_cb_tty_master: 683 Bad file" error any more, and
redirecting stderr now works too. But redirecting stdout in addition
still doesn't?

Maybe I'm missing another fix from trunk, though.

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https://bugs.launchpad.net/bugs/1551960

Title:
  lxc-attach does not work any more with input redirection

Status in lxc package in Ubuntu:
  Fix Committed

Bug description:
  LXC 2.0.0~rc{2,3,4} break autopkgtest's LXC runner. Downgrading to
  2.0.0~rc1 works again. The issue is that lxc-attach stops working
  properly with input redirection.

  # lxc-start -n a

  Until 2.0.0~rc1 I could redirect lxc-attach's stdout:
  # lxc-attach -n a runlevel </dev/null 2>/dev/null |cat
  N 5

  But now this does not work any more:
  # lxc-attach -n a runlevel 
  N 5
  # lxc-attach -n a runlevel </dev/null
  lxc-attach: console.c: lxc_console_cb_tty_master: 683 Bad file descriptor - failed to write
  # lxc-attach -n a runlevel </dev/null 2>/dev/null
  # lxc-attach -n a runlevel </dev/null 2>/dev/null | cat
  # 

  I. e. the last two commands don't have any output at all any more.

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