Date: Tue, 25 Mar 2008 09:20:05 GMT From: Jaakko Heinonen <jh@saunalahti.fi> To: freebsd-bugs@FreeBSD.org Subject: Re: bin/121502: option -P appears to be broken in restore(8) since FreeBSD 6.3 (regression) Message-ID: <200803250920.m2P9K5Rs033907@freefall.freebsd.org>
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The following reply was made to PR bin/121502; it has been noted by GNATS.
From: Jaakko Heinonen <jh@saunalahti.fi>
To: Derek =?utf-8?B?S3VsacWEc2tp?= <takeda@takeda.tk>
Cc: bug-followup@FreeBSD.org, green@FreeBSD.org
Subject: Re: bin/121502: option -P appears to be broken in restore(8) since
FreeBSD 6.3 (regression)
Date: Tue, 25 Mar 2008 11:10:20 +0200
Hi,
On 2008-03-24, Derek Kuliński wrote:
> One more thing, before patching, there's a different behavior:
> When I use it with gzip from ports, it behaves pretty much like it did
> in the past (asking for the volume number)
Looking at the source code the behavior after patching might be
correct:
(tape.c)
308 if (pipein) {
309 if (nextvol != 1) {
310 panic("Changing volumes on pipe input?\n");
311 /* Avoid looping if we couldn't ask the user. */
312 if (yflag || ferror(terminal) || feof(terminal))
313 done(1);
314 }
315 if (volno == 1)
316 return;
317 if (pipecmdin) {
318 closemt();
319 goto getpipecmdhdr;
320 }
321 goto gethdr;
322 }
In unpatched restore(8) pipein and pipecmdin are never set at the same time.
Thus the code never reaches line 319 which causes restore(8) to skip "Specify
next volume #: " prompt. (When volno == 1 it's already skipped at line
316.) However looking at it more carefully the goto on line 319 can't be
correct either because then newvol will be uninitialized at line 409.
Seems that -P has been broken since it's introduction to tape.c revision
1.39. I have cc'd green@ who committed the revision 1.39. He should know
what the intended behavior is. (Please see
http://www.freebsd.org/cgi/query-pr.cgi?pr=121502 what we have found out
so far.)
--
Jaakko
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