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

[Martin Pitt]

Public bug reported:

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.

** Affects: autopkgtest (Ubuntu)
     Importance: High
         Status: New

** Affects: lxc (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: regression-release xenial

** Also affects: autopkgtest (Ubuntu)
   Importance: Undecided
       Status: New

** Changed in: autopkgtest (Ubuntu)
   Importance: Undecided => High

** Tags added: regression-release xenial

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

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

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