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