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Verify we know how to read a pack before trying to using it.

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If the pack format were to ever change or be extended in the future
there is no assurance that just because the pack file lives in
objects/pack and doesn't end in .idx that we can read and decompress
its contents properly.

If we encounter what we think is a pack file and it isn't or we don't
recognize its version then die and suggest to the user that they
upgrade to a newer version of GIT which can handle that pack file.

Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
Signed-off-by: Junio C Hamano <junkio@cox.net>
This commit is contained in:
Shawn Pearce 2006-08-21 03:10:02 -04:00 committed by Junio C Hamano
parent 7230e6d042
commit da7560110f
1 changed files with 12 additions and 0 deletions
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12
sha1_file.c
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@ -463,6 +463,7 @@ int use_packed_git(struct packed_git *p)
int fd;
struct stat st;
void *map;
struct pack_header *hdr;
pack_mapped += p->pack_size;
while (PACK_MAX_SZ < pack_mapped && unuse_one_packed_git())
@ -482,6 +483,17 @@ int use_packed_git(struct packed_git *p)
die("packfile %s cannot be mapped.", p->pack_name);
p->pack_base = map;
/* Check if we understand this pack file. If we don't we're
* likely too old to handle it.
*/
hdr = map;
if (hdr->hdr_signature != htonl(PACK_SIGNATURE))
die("packfile %s isn't actually a pack.", p->pack_name);
if (!pack_version_ok(hdr->hdr_version))
die("packfile %s is version %i and not supported"
" (try upgrading GIT to a newer version)",
p->pack_name, ntohl(hdr->hdr_version));
/* Check if the pack file matches with the index file.
* this is cheap.
*/