[Bug 211406] su -l clears LOGNAME environment variable

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=211406

            Bug ID: 211406
           Summary: su -l clears LOGNAME environment variable
           Product: Base System
           Version: 10.3-STABLE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: bin
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: d.y.kazarov at mail.ru

Created attachment 173036
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=173036&action=edit
Patch for su.c and su.1

POSIX 1003.1 states:
"LOGNAME
    The system shall initialize this variable at the time of login to be the
user's login name. See <pwd.h>. For a value of LOGNAME to be portable across
implementations of POSIX.1-2008, the value should be composed of characters
from the portable filename character set."
(http://pubs.opengroup.org/onlinepubs/009695399/basedefs/xbd_chap08.html)

"su -l" Simulate a full login. But LOGNAME is unset after "su -l".

samba port depends on this variable during some operations (see
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=175544) but samba's developer
refuses to do anything about it (see
https://bugzilla.samba.org/show_bug.cgi?id=9592).

IMHO "su -l" shall set this variable  since it's part of POSIX standard.

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