On Mon, Feb 09, 2009 at 11:55:05AM -0500, Venkatesh Srinivas wrote: > On Mon, Feb 09, 2009 at 08:48:33AM -0800, Russ Cox wrote: >> On Mon, Feb 9, 2009 at 4:56 AM, Venkatesh Srinivas <m...@acm.jhu.edu> wrote: >>> vcopy: reading block 0000000000000000000000000000000000000000 (type 16): >>> read asked for 0000000000000000000000000000000000000000 got >>> da39a3ee5e6b4b0d3255bfef95601890afd80709 >> >> The real question is how you got an archive with an all zeros score in it. >> There are some programs that use that internally to mean "no block" >> but any time such a block is written to venti, the score should be the >> zero-byte sha1 da39...0709. >> > > When I use -V with Plan 9's vcopy, the zero score block isn't listed... > I suspect that the block with the zero score is not actually in the > archive? > > -- vs >
I just tripped over this myself and found that apparently Plan 9 native vac
sets root.prev to all zeros when there is no previous root. So I applied
the diff below. I'm not sure this is a correct fix?
--nwf;
diff -r 74392a7c323c src/cmd/venti/copy.c
--- a/src/cmd/venti/copy.c Wed Mar 11 13:37:29 2009 -0700
+++ b/src/cmd/venti/copy.c Tue Mar 31 03:12:53 2009 -0400
@@ -10,6 +10,8 @@
int fast;
int verbose;
VtConn *zsrc, *zdst;
+
+uchar allzeros[VtScoreSize];
void
usage(void)
@@ -54,7 +56,8 @@
break;
}
walk(root.score, VtDirType, 0);
- walk(root.prev, VtRootType, 0);
+ if(memcmp(root.prev, allzeros, VtScoreSize))
+ walk(root.prev, VtRootType, 0);
if(rewrite)
vtrootpack(&root, buf); /* walk might have changed
score */
break;
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