Re: [PATCH] index-pack: correctly initialize appended objects
- From
Junio C Hamano <gitster@pobox.com>
- Date
- Jul 25, 2008, 05:21 UTC
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- <7vy73q4jzp.fsf@gitster.siamese.dyndns.org>
- In-Reply-To
- <alpine.DEB.1.00.0807241821440.8986@racer>
Johannes Schindelin <Johannes.Schindelin@gmx.de> writes:
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> From: Björn Steinbrink <B.Steinbrink@gmx.de> > > When index-pack completes a thin pack it appends objects to the pack. > Since the commit 92392b4(index-pack: Honor core.deltaBaseCacheLimit when > resolving deltas) such an object can be pruned in case of memory > pressure. > > To be able to re-read the object later, a few more fields have to be set. > > Noticed by Pierre Habouzit. > > Hopefully-signed-off-by: Björn Steinbrink <B.Steinbrink@gmx.de> > Hopefully-reviewed-and-signed-off-by: Nicolas Pitre <nico@cam.org>, > > -- > Nico could you have a quick look? (I would ask Shawn, but I know > that he is pretty busy with real world issues.)
Reading get_data_from_pack(), it does rely on hdr_size, idx.offset and idx.offset of the next entry to be set correctly. The function does not seem to use type (which the patch is also setting) nor real_type (which the patch does not set).
However, the code checks objects[nth].real_type all over the place in the code. Doesn't the lack of real_type assignment in append_obj_to_pack() affect them in any way?
Show 13 quoted lines
> diff --git a/index-pack.c b/index-pack.c > index ac20a46..33ba8ef 100644 > --- a/index-pack.c > +++ b/index-pack.c > @@ -699,6 +699,9 @@ static struct object_entry *append_obj_to_pack( > write_or_die(output_fd, header, n); > obj[0].idx.crc32 = crc32(0, Z_NULL, 0); > obj[0].idx.crc32 = crc32(obj[0].idx.crc32, header, n); > + obj[0].hdr_size = n; > + obj[0].type = type; > + obj[0].size = size; > obj[1].idx.offset = obj[0].idx.offset + n; > obj[1].idx.offset += write_compressed(output_fd, buf, size, &obj[0].idx.crc32);