[Bug 863629] Re: libvirt-lxc: virFileOpenTtyAt can't be called on /some/other/dev/pts

[Scott Moser]

Just for reference, Serge posted to libc-alpha mailing list at
http://www.cygwin.com/ml/libc-alpha/2011-10/threads.html#00009
("multiple devpts mounts not supported
insysdeps/unix/sysv/linux/ptsname.c:_ptsname_internal()")

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Title:
  libvirt-lxc: virFileOpenTtyAt can't be called on /some/other/dev/pts

Status in “libvirt” package in Ubuntu:
  Confirmed

Bug description:
  lxcControllerRun() is calling virFileOpenTtyAt() with a slave opened
  on /the/container/chroot/dev/pts.  While it is not documented in the
  manpages, glibc's grantpt does a first check (ensuring that the passed
  in fd is a pty slave) with '/dev/pts' as the hardcoded path, appending
  the pty#.

  lxcControllerRun always calls this on the first slave opened after
  creating the new /dev/pts, so grantpt is always checking /dev/pts/0.
  Therefore, if your host does not have /dev/pts/0 (easy to reproduce
  using screen), then grantpt will fail, and the container creation will
  subsequently also fail.

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