bug#18386: logname fails with error "logname: no login name" (is there an echo in here)

[Bernhard Voelker]

On 09/02/2014 02:06 AM, Linda Walsh wrote:
> >  logname
> logname: no login name

logname(1) works here on a regular openSUSE-13.1 system, and
just calls getlogin(3) to get the information as required:

  $ ltrace logname
  ...
  getlogin()                 = "berny"

which in turn seems to retrieve the information like this:

  $ strace logname
  ...
  open("/proc/self/loginuid", O_RDONLY)   = 3
  read(3, "717", 12)                      = 3
  close(3)                                = 0
  socket(PF_LOCAL, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0) = 3
  connect(3, {sa_family=AF_LOCAL, sun_path="/var/run/nscd/socket"}, 110) = 0
  sendto(3, "\2\0\0\0\v\0\0\0\7\0\0\0passwd\0", 19, MSG_NOSIGNAL, NULL, 0) = 19
  ...

Don't you have /proc mounted?

> Ishtar:/> who -a
> Ishtar:/> who -t
> Ishtar:/> who -u
> Ishtar:/> who -b
> Linux Ishtar 3.16.0-Isht-Van #1 SMP PREEMPT Tue Aug 12 11:11:02 PDT 2014 x86_64 
> x86_64 x86_64 GNU/Linux
>
> I wonder if the who command's output being broken is related?

Similar for who(1) here:

  $ strace who
  ...
  open("/var/run/utmp", O_RDONLY|O_CLOEXEC) = 3
  ...

> Distro is a 13.1 SuSE base, but wouldn't call it a stock system (still boots 
> w/sysvinit)

It looks like trying to avoid systemd is not that easy ...

Have a nice day,
Berny