[buildd-tools-devel] Bug#849169: sbuild: Expect programe reported "no more ptys" and failed in rebuilding gcc with normal (non-root) user

[Xiangyu LIU]

Package: sbuild
Version: 0.72.0-2
Severity: minor

Dear Sbuild Maintainer,


   I want to rebuild locally gcc-5 and gcc-4.9 in current stretch by Sbuild.


   I download the source of gcc-5 (Debian) and gcc-4.9 (from Ubuntu) and rebuild by "sbuild -d stretch gcc-xxxxx.dsc".
   But building failed with reporting:
      "The system has no more ptys. Ask your system administrator to create more."
      "while executing"
      "spawn ls"

   I gave a try in Sbuild with root user:
   # expect -c "spawn ls"
   It is OK to output "spawn ls"

   But when I type above command with normal user:
   sh-4.4$ expect -c "spawn ls"
           spawn ls
           The system has no more ptys.  Ask your system administrator to create more.
           while executing
           "spawn ls"

   I check the /dev/pts, it was mounted in sbuild (with both root/normal users):
        sh-4.4$ mount | grep pts
                devpts on /dev/pts type devpts (rw,nosuid,noexec,relatime,gid=5,mode=620,ptmxmode=000)

        (stretch-amd64-sbuild)root at WFA256:/# mount | grep pts
                                             devpts on /dev/pts type devpts (rw,nosuid,noexec,relatime,gid=5,mode=620,ptmxmode=000)

  
   I have same issue in pbuilder if I rebuild gcc by:
      $ sudo pbuilder build gcc-xxxx.dsc

   But it is OK if rebuild with root user by sbuild
      $ sudo sbuild -d stretch gcc-xxxx.dsc


   Yes I can rebuild gcc by sudo sbuild, but I don't know what is happening in Sbuild with normal user.
   Any comment or advice would be very appreciated !


-- System Information:
Debian Release: stretch/sid
  APT prefers testing
  APT policy: (500, 'testing')
Architecture: amd64 (x86_64)

Kernel: Linux 4.8.15-02.custom.slackware-sign (SMP w/4 CPU cores)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/bash
Init: systemd (via /run/systemd/system)

Versions of packages sbuild depends on:
ii  adduser         3.115
ii  apt-utils       1.4~beta2
ii  libsbuild-perl  0.72.0-2
pn  perl:any        <none>

Versions of packages sbuild recommends:
ii  debootstrap  1.0.87

Versions of packages sbuild suggests:
pn  autopkgtest  <none>
pn  deborphan    <none>
ii  wget         1.18-4

-- Configuration Files:
/etc/sbuild/sbuild.conf changed:
$build_arch_all = 1;
$distribution = 'stretch';
1;


-- no debconf information