bin/38412: restore(8) can't handle correctly old incremental dump files

[taca%back-street.net@localhost]

>Number:         38412
>Category:       bin
>Synopsis:       restore(8) can't handle correctly old incremental dump files
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    bin-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Sat Apr 12 10:00:00 +0000 2008
>Originator:     Takahiro Kambe
>Release:        NetBSD 4.0_STABLE
>Organization:
        
>Environment:
        
        
System: NetBSD ns.back-street.net 4.0_STABLE NetBSD 4.0_STABLE (EPIA) #7: Sat 
Mar 22 17:53:01 JST 2008 
taca%boy.a.back-street.net@localhost:/data/i386/obj4/sys/arch/i386/compile/EPIA 
i386
Architecture: i386
Machine: i386
>Description:
        NetBSD 4.0's restore(8) can't handle correctly old incremantal
        dump files which backuped on NetBSD 1.6.2 or before.

>How-To-Repeat:
        Try to restore dump files created on NetBSD 1.6.2.

        # restore rf dump.0     (level 0 dump file)
        # restore rf dump.1     (level 1 dump file)

        # /sbin/restore ivf dump.1
        Verify tape and initialize maps
        Dump   date: Thu Jan  1 09:00:00 1970                   (Oops!)
        Dumped from: the epoch                                  (Oops!)
        Level 1 dump of / on host.example.ed.jp:/dev/rwd0a
        Label: none
        Extract directories from tape
        Initialize symbol table.

        When using restore(8) of NetBSD 1.6.2:

        # /netbsd162/restore ivf -
        Verify tape and initialize maps
        Dump   date: Sat Apr 12 09:19:33 2008
        Dumped from: Sat Apr  5 00:21:00 2008
        Level 1 dump of / on host.example.ed.jp:/dev/rwd0a
        Label: none
        Extract directories from tape
        Initialize symbol table.
        restore >

>Fix:
        Old dump files dosen't have c_date and c_ddate field in
        union u_spcl -> struct s_spcl.  But restore(8) command onNetBSD 4.0
        (maybe 2.0 or 3.0) dosen't care for it.

        Use c_old_date and c_old_ddate:

                - dump level is greater than 0.
                - c_date and c_ddate field are zero.

        Other "old" field might be checked.

>Unformatted: