index-pack --verify (or verify-pack) is about verifying the pack
itself. SHA-1 collision test is about outside (probably malicious)
objects with the same SHA-1 entering current repo.
SHA-1 collision test is currently done unconditionally. Which means if
you verify an in-repo pack, all objects from the pack will be checked
against objects in repo, which are themselves.
Skip this test for --verify, unless --strict is also specified.
linux-2.6 $ ls -sh .git/objects/pack/pack-e7732c98a8d54840add294c3c562840f78764196.pack
401M .git/objects/pack/pack-e7732c98a8d54840add294c3c562840f78764196.pack
Without the patch (and with another patch to cut out second pass in
index-pack):
linux-2.6 $ time ~/w/git/old index-pack -v --verify .git/objects/pack/pack-e7732c98a8d54840add294c3c562840f78764196.pack
Indexing objects: 100% (1944656/1944656), done.
fatal: pack has 1617280 unresolved deltas
real 1m1.223s
user 0m55.028s
sys 0m0.828s
With the patch:
linux-2.6 $ time ~/w/git/git index-pack -v --verify .git/objects/pack/pack-e7732c98a8d54840add294c3c562840f78764196.pack
Indexing objects: 100% (1944656/1944656), done.
fatal: pack has 1617280 unresolved deltas
real 0m41.714s
user 0m40.994s
sys 0m0.550s
Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@xxxxxxxxx>
---
builtin/index-pack.c | 5 +++--
1 files changed, 3 insertions(+), 2 deletions(-)
diff --git a/builtin/index-pack.c b/builtin/index-pack.c
index dd1c5c9..cee83b9 100644
--- a/builtin/index-pack.c
+++ b/builtin/index-pack.c
@@ -62,6 +62,7 @@ static int nr_resolved_deltas;
static int from_stdin;
static int strict;
+static int verify;
static int verbose;
static struct progress *progress;
@@ -461,7 +462,7 @@ static void sha1_object(const void *data, unsigned long size,
enum object_type type, unsigned char *sha1)
{
hash_sha1_file(data, size, typename(type), sha1);
- if (has_sha1_file(sha1)) {
+ if ((strict || !verify) && has_sha1_file(sha1)) {
void *has_data;
enum object_type has_type;
unsigned long has_size;
@@ -1078,7 +1079,7 @@ static void show_pack_info(int stat_only)
int cmd_index_pack(int argc, const char **argv, const char *prefix)
{
- int i, fix_thin_pack = 0, verify = 0, stat_only = 0, stat = 0;
+ int i, fix_thin_pack = 0, stat_only = 0, stat = 0;
const char *curr_pack, *curr_index;
const char *index_name = NULL, *pack_name = NULL;
const char *keep_name = NULL, *keep_msg = NULL;
--
1.7.3.1.256.g2539c.dirty
--
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