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Two head revisions?


From: Derek R. Price
Subject: Two head revisions?
Date: Fri, 28 Apr 2006 11:47:20 -0400
User-agent: Thunderbird 1.5 (X11/20060313)

Has anyone ever seen RCS archive corruption in the form of two head
revisions or have any idea how it may have come about?

It appears to have happened as part of a commit.  The head revision was
initially 1.4.  CVS overwrote the metadata entry for 1.4 (commit time,
author, state, branches, next), but put a second, undiffed entry for the
head revision after the first.  So, before the commit, the file probably
looked like:

RCSHEADER

1.4
date YYYY.MM.DD.hh.mm.ss;       author janedoe; state Exp;
branches;
next    1.3;

[REVISION METADATA 1.3-1.1)

desc
@@

1.4
log
@what jane did
@
text
@jane's content
@

1.3
log
@what's gone before
@
text
@a diff from jane's content
@

...



Then, after the (otherwise successful) commit:

RCSHEADER

1.4
date YYYY.MM.DD.hh.mm.ss;       author joeschmoe;       state Exp;
branches;
next    1.3;

[REVISION METADATA 1.3-1.1)

desc
@@

1.4
log
@what jane did
@
text
@jane's content
@

1.4
log
@what joe did
@
text
@joe's content (based on jane's content, but not the diff from it)
@

1.3
log
@what's gone before
@
text
@a diff from joe's content
@

...



I know for a fact that the final 1.3 text is a diff from joe's content,
because if I reconstruct the file minus joe's head revision, I get an
"invalid change text" error checking out 1.3, but if I reconstruct it
minus jane's head revision, revision 1.3 will check out.

Using the two head revisions, I cannot reproduce this problem via a
simple commit.

Regards,

Derek
-- 
Derek R. Price
CVS Solutions Architect
Ximbiot <http://ximbiot.com>
v: +1 248.835.1260
f: +1 248.835.1263
<address@hidden>




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