General const correctness fixes
[git/git.git] / pack-check.c
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1#include "cache.h"
2#include "pack.h"
3
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4static int verify_packfile(struct packed_git *p,
5 struct pack_window **w_curs)
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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];
079afb18 11 unsigned long offset = 0, pack_sig = p->pack_size - 20;
f3bf9224 12 int nr_objects, err, i;
f9253394 13
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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 */
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19
20 SHA1_Init(&ctx);
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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 }
f9253394 29 SHA1_Final(sha1, &ctx);
079afb18 30 if (hashcmp(sha1, use_pack(p, w_curs, pack_sig, NULL)))
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31 return error("Packfile %s SHA1 mismatch with itself",
32 p->pack_name);
a89fccd2 33 if (hashcmp(sha1, (unsigned char *)index_base + index_size - 40))
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34 return error("Packfile %s SHA1 mismatch with idx",
35 p->pack_name);
079afb18 36 unuse_pack(w_curs);
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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 */
079afb18 42 nr_objects = num_packed_objects(p);
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43 for (i = err = 0; i < nr_objects; i++) {
44 unsigned char sha1[20];
f3bf9224 45 void *data;
21666f1a 46 enum object_type type;
43057304 47 unsigned long size, offset;
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48
49 if (nth_packed_object_sha1(p, i, sha1))
50 die("internal error pack-check nth-packed-object");
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51 offset = find_pack_entry_one(sha1, p);
52 if (!offset)
f3bf9224 53 die("internal error pack-check find-pack-entry-one");
21666f1a 54 data = unpack_entry(p, offset, &type, &size);
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55 if (!data) {
56 err = error("cannot unpack %s from %s",
57 sha1_to_hex(sha1), p->pack_name);
58 continue;
59 }
21666f1a 60 if (check_sha1_signature(sha1, data, size, typename(type))) {
1038f0c0 61 err = error("packed %s from %s is corrupt",
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62 sha1_to_hex(sha1), p->pack_name);
63 free(data);
64 continue;
65 }
66 free(data);
67 }
68
69 return err;
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70}
71
72
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73#define MAX_CHAIN 40
74
079afb18 75static void show_pack_info(struct packed_git *p)
f3bf9224 76{
ad8c80a5 77 int nr_objects, i;
473ab165 78 unsigned int chain_histogram[MAX_CHAIN];
ad8c80a5 79
079afb18 80 nr_objects = num_packed_objects(p);
473ab165 81 memset(chain_histogram, 0, sizeof(chain_histogram));
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82
83 for (i = 0; i < nr_objects; i++) {
84 unsigned char sha1[20], base_sha1[20];
21666f1a 85 const char *type;
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86 unsigned long size;
87 unsigned long store_size;
43057304 88 unsigned long offset;
f8f135c9 89 unsigned int delta_chain_length;
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90
91 if (nth_packed_object_sha1(p, i, sha1))
92 die("internal error pack-check nth-packed-object");
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93 offset = find_pack_entry_one(sha1, p);
94 if (!offset)
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95 die("internal error pack-check find-pack-entry-one");
96
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97 type = packed_object_info_detail(p, offset, &size, &store_size,
98 &delta_chain_length,
99 base_sha1);
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100 printf("%s ", sha1_to_hex(sha1));
101 if (!delta_chain_length)
43057304 102 printf("%-6s %lu %lu\n", type, size, offset);
473ab165 103 else {
43057304 104 printf("%-6s %lu %lu %u %s\n", type, size, offset,
ad8c80a5 105 delta_chain_length, sha1_to_hex(base_sha1));
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106 if (delta_chain_length < MAX_CHAIN)
107 chain_histogram[delta_chain_length]++;
108 else
109 chain_histogram[0]++;
110 }
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111 }
112
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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 }
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122}
123
124int verify_pack(struct packed_git *p, int verbose)
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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
f3bf9224 132 ret = 0;
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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);
a89fccd2 137 if (hashcmp(sha1, (unsigned char *)index_base + index_size - 20))
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138 ret = error("Packfile index for %s SHA1 mismatch",
139 p->pack_name);
140
141 if (!ret) {
142 /* Verify pack file */
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143 struct pack_window *w_curs = NULL;
144 ret = verify_packfile(p, &w_curs);
145 unuse_pack(&w_curs);
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146 }
147
148 if (verbose) {
149 if (ret)
150 printf("%s: bad\n", p->pack_name);
151 else {
079afb18 152 show_pack_info(p);
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153 printf("%s: ok\n", p->pack_name);
154 }
155 }
f9253394 156
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157 return ret;
158}