From: Shawn Pearce Date: Mon, 21 Aug 2006 07:10:02 +0000 (-0400) Subject: Verify we know how to read a pack before trying to using it. X-Git-Tag: v1.4.3-rc1~213 X-Git-Url: http://git.tremily.us/?a=commitdiff_plain;h=da7560110f91088ee2a664e98f75ff54e0d9e1e1;p=git.git Verify we know how to read a pack before trying to using it. 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 Signed-off-by: Junio C Hamano --- diff --git a/sha1_file.c b/sha1_file.c index 04f7f94d2..5f34c69d3 100644 --- a/sha1_file.c +++ b/sha1_file.c @@ -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. */