1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
|
#include "cache.h"
#include "pack.h"
#include "pack-revindex.h"
struct idx_entry
{
const unsigned char *sha1;
off_t offset;
};
static int compare_entries(const void *e1, const void *e2)
{
const struct idx_entry *entry1 = e1;
const struct idx_entry *entry2 = e2;
if (entry1->offset < entry2->offset)
return -1;
if (entry1->offset > entry2->offset)
return 1;
return 0;
}
static int verify_packfile(struct packed_git *p,
struct pack_window **w_curs)
{
off_t index_size = p->index_size;
const unsigned char *index_base = p->index_data;
SHA_CTX ctx;
unsigned char sha1[20];
off_t offset = 0, pack_sig = p->pack_size - 20;
uint32_t nr_objects, i;
int err;
struct idx_entry *entries;
/* Note that the pack header checks are actually performed by
* use_pack when it first opens the pack file. If anything
* goes wrong during those checks then the call will die out
* immediately.
*/
SHA1_Init(&ctx);
while (offset < pack_sig) {
unsigned int remaining;
unsigned char *in = use_pack(p, w_curs, offset, &remaining);
offset += remaining;
if (offset > pack_sig)
remaining -= (unsigned int)(offset - pack_sig);
SHA1_Update(&ctx, in, remaining);
}
SHA1_Final(sha1, &ctx);
if (hashcmp(sha1, use_pack(p, w_curs, pack_sig, NULL)))
return error("Packfile %s SHA1 mismatch with itself",
p->pack_name);
if (hashcmp(sha1, index_base + index_size - 40))
return error("Packfile %s SHA1 mismatch with idx",
p->pack_name);
unuse_pack(w_curs);
/* Make sure everything reachable from idx is valid. Since we
* have verified that nr_objects matches between idx and pack,
* we do not do scan-streaming check on the pack file.
*/
nr_objects = p->num_objects;
entries = xmalloc(nr_objects * sizeof(*entries));
/* first sort entries by pack offset, since unpacking them is more efficient that way */
for (i = 0; i < nr_objects; i++) {
entries[i].sha1 = nth_packed_object_sha1(p, i);
if (!entries[i].sha1)
die("internal error pack-check nth-packed-object");
entries[i].offset = find_pack_entry_one(entries[i].sha1, p);
if (!entries[i].offset)
die("internal error pack-check find-pack-entry-one");
}
qsort(entries, nr_objects, sizeof(*entries), compare_entries);
for (i = 0, err = 0; i < nr_objects; i++) {
void *data;
enum object_type type;
unsigned long size;
data = unpack_entry(p, entries[i].offset, &type, &size);
if (!data) {
err = error("cannot unpack %s from %s",
sha1_to_hex(entries[i].sha1), p->pack_name);
continue;
}
if (check_sha1_signature(entries[i].sha1, data, size, typename(type))) {
err = error("packed %s from %s is corrupt",
sha1_to_hex(entries[i].sha1), p->pack_name);
free(data);
continue;
}
free(data);
}
free(entries);
return err;
}
#define MAX_CHAIN 50
static void show_pack_info(struct packed_git *p)
{
uint32_t nr_objects, i, chain_histogram[MAX_CHAIN+1];
nr_objects = p->num_objects;
memset(chain_histogram, 0, sizeof(chain_histogram));
init_pack_revindex();
for (i = 0; i < nr_objects; i++) {
const unsigned char *sha1;
unsigned char base_sha1[20];
const char *type;
unsigned long size;
unsigned long store_size;
off_t offset;
unsigned int delta_chain_length;
sha1 = nth_packed_object_sha1(p, i);
if (!sha1)
die("internal error pack-check nth-packed-object");
offset = find_pack_entry_one(sha1, p);
if (!offset)
die("internal error pack-check find-pack-entry-one");
type = packed_object_info_detail(p, offset, &size, &store_size,
&delta_chain_length,
base_sha1);
printf("%s ", sha1_to_hex(sha1));
if (!delta_chain_length)
printf("%-6s %lu %"PRIuMAX"\n",
type, size, (uintmax_t)offset);
else {
printf("%-6s %lu %"PRIuMAX" %u %s\n",
type, size, (uintmax_t)offset,
delta_chain_length, sha1_to_hex(base_sha1));
if (delta_chain_length <= MAX_CHAIN)
chain_histogram[delta_chain_length]++;
else
chain_histogram[0]++;
}
}
for (i = 0; i <= MAX_CHAIN; i++) {
if (!chain_histogram[i])
continue;
printf("chain length = %d: %d object%s\n", i,
chain_histogram[i], chain_histogram[i] > 1 ? "s" : "");
}
if (chain_histogram[0])
printf("chain length > %d: %d object%s\n", MAX_CHAIN,
chain_histogram[0], chain_histogram[0] > 1 ? "s" : "");
}
int verify_pack(struct packed_git *p, int verbose)
{
off_t index_size;
const unsigned char *index_base;
SHA_CTX ctx;
unsigned char sha1[20];
int ret;
if (open_pack_index(p))
return error("packfile %s index not opened", p->pack_name);
index_size = p->index_size;
index_base = p->index_data;
ret = 0;
/* Verify SHA1 sum of the index file */
SHA1_Init(&ctx);
SHA1_Update(&ctx, index_base, (unsigned int)(index_size - 20));
SHA1_Final(sha1, &ctx);
if (hashcmp(sha1, index_base + index_size - 20))
ret = error("Packfile index for %s SHA1 mismatch",
p->pack_name);
if (!ret) {
/* Verify pack file */
struct pack_window *w_curs = NULL;
ret = verify_packfile(p, &w_curs);
unuse_pack(&w_curs);
}
if (verbose) {
if (ret)
printf("%s: bad\n", p->pack_name);
else {
show_pack_info(p);
printf("%s: ok\n", p->pack_name);
}
}
return ret;
}
|
