From 68be2fea50e7a34c0e5f9fdf6adb9040c8df197f Mon Sep 17 00:00:00 2001
From: Junio C Hamano <gitster@pobox.com>
Date: Wed, 16 Nov 2011 22:04:13 -0800
Subject: [PATCH] receive-pack, fetch-pack: reject bogus pack that records
objects twice
When receive-pack & fetch-pack are run and store the pack obtained over
the wire to a local repository, they internally run the index-pack command
with the --strict option. Make sure that we reject incoming packfile that
records objects twice to avoid spreading such a damage.
Signed-off-by: Junio C Hamano <gitster@pobox.com>
---
builtin/index-pack.c | 4 +++-
object.c | 2 ++
pack-write.c | 4 ++++
pack.h | 3 ++-
4 files changed, 11 insertions(+), 2 deletions(-)
diff --git a/builtin/index-pack.c b/builtin/index-pack.c
index 0945adbb3bb..98025da7670 100644
--- a/builtin/index-pack.c
+++ b/builtin/index-pack.c
@@ -1122,8 +1122,10 @@ int cmd_index_pack(int argc, const char **argv, const char *prefix)
if (!index_name)
die("--verify with no packfile name given");
read_idx_option(&opts, index_name);
- opts.flags |= WRITE_IDX_VERIFY;
+ opts.flags |= WRITE_IDX_VERIFY | WRITE_IDX_STRICT;
}
+ if (strict)
+ opts.flags |= WRITE_IDX_STRICT;
curr_pack = open_pack_file(pack_name);
parse_pack_header();
diff --git a/object.c b/object.c
index 31976b5d70b..d8d09f92aac 100644
--- a/object.c
+++ b/object.c
@@ -149,6 +149,8 @@ struct object *parse_object_buffer(const unsigned char *sha1, enum object_type t
struct tree *tree = lookup_tree(sha1);
if (tree) {
obj = &tree->object;
+ if (!tree->buffer)
+ tree->object.parsed = 0;
if (!tree->object.parsed) {
if (parse_tree_buffer(tree, buffer, size))
return NULL;
diff --git a/pack-write.c b/pack-write.c
index 9cd3bfbb4b3..f84adde3eb3 100644
--- a/pack-write.c
+++ b/pack-write.c
@@ -129,6 +129,10 @@ const char *write_idx_file(const char *index_name, struct pack_idx_entry **objec
}
sha1write(f, obj->sha1, 20);
git_SHA1_Update(&ctx, obj->sha1, 20);
+ if ((opts->flags & WRITE_IDX_STRICT) &&
+ (i && !hashcmp(list[-2]->sha1, obj->sha1)))
+ die("The same object %s appears twice in the pack",
+ sha1_to_hex(obj->sha1));
}
if (index_version >= 2) {
diff --git a/pack.h b/pack.h
index 722a54e00a2..aca47393190 100644
--- a/pack.h
+++ b/pack.h
@@ -37,7 +37,8 @@ struct pack_header {
struct pack_idx_option {
unsigned flags;
/* flag bits */
-#define WRITE_IDX_VERIFY 01
+#define WRITE_IDX_VERIFY 01 /* verify only, do not write the idx file */
+#define WRITE_IDX_STRICT 02
uint32_t version;
uint32_t off32_limit;