bin/183962: `last reboot` does not return any result

[Patrick Proniewski]

>Number:         183962
>Category:       bin
>Synopsis:       `last reboot` does not return any result
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Thu Nov 14 18:10:01 UTC 2013
>Closed-Date:
>Last-Modified:
>Originator:     Patrick Proniewski
>Release:        9.2-RELEASE amd64
>Organization:
>Environment:
FreeBSD mydomain 9.2-RELEASE FreeBSD 9.2-RELEASE #0 r255898: Thu Sep 26 22:50:31 UTC 2013     root at bake.isc.freebsd.org:/usr/obj/usr/src/sys/GENERIC  amd64

>Description:
The last(1) command has evolved between FreeBSD 8 and FreeBSD 9. On FreeBSD 8 issuing `last reboot` will list every reboot of the OS during current month (by default). This is done thanks to a virtual user named "reboot" used to register reboot actions into wtmp file.
On FreeBSD 9, storage of these informations has moved from wtmp to a new file: utx. It looks like the pseudo-user "reboot" is no longer available in utx database, so issuing `last reboot` returns nothing :

FreeBSD 8:
---------------
$ last -f /var/log/wtmp.1 reboot
reboot           ~                         Thu Sep 12 07:03

wtmp begins Mon Sep  2 09:53:18 CEST 2013
---------------

FreeBSD 9:
---------------
$ last -f /var/log/utx.log.1 reboot

wtmp begins Mon Sep  2 07:13:57 CEST 2013
---------------

Content of utx.log does not include proper reboot info, instead it lists shutdown and boot time:

$ last -f /var/log/utx.log.1 | grep 'shut\|boot'
boot time                                  Thu Sep 12 06:40
shutdown time                              Thu Sep 12 06:40
user     pts/1    192.168.0.2            Thu Sep 12 06:37 - shutdown  (00:02)

So:

-1 man page is not up to date
-2 last(1) source code is not up to date (still outputs "wtmp begins...")
-3 would be great if `last reboot` could work like in FreeBSD 8.
>How-To-Repeat:
compare output of `last reboot` on FreeBSD 8 and FreeBSD 9.
>Fix:


>Release-Note:
>Audit-Trail:
>Unformatted: