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