"git checkout -- paths..." should error out when paths cannot be written
[git/git.git] / pack-check.c
CommitLineData
f9253394
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1#include "cache.h"
2#include "pack.h"
70f5d5d3 3#include "pack-revindex.h"
f9253394 4
3af51928
AJ
5struct idx_entry
6{
7 const unsigned char *sha1;
8 off_t offset;
9};
10
11static int compare_entries(const void *e1, const void *e2)
12{
13 const struct idx_entry *entry1 = e1;
14 const struct idx_entry *entry2 = e2;
15 if (entry1->offset < entry2->offset)
16 return -1;
17 if (entry1->offset > entry2->offset)
18 return 1;
19 return 0;
20}
21
03e79c88
SP
22static int verify_packfile(struct packed_git *p,
23 struct pack_window **w_curs)
f9253394 24{
c4001d92 25 off_t index_size = p->index_size;
42873078 26 const unsigned char *index_base = p->index_data;
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27 SHA_CTX ctx;
28 unsigned char sha1[20];
c4001d92 29 off_t offset = 0, pack_sig = p->pack_size - 20;
326bf396
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30 uint32_t nr_objects, i;
31 int err;
3af51928 32 struct idx_entry *entries;
f9253394 33
079afb18
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34 /* Note that the pack header checks are actually performed by
35 * use_pack when it first opens the pack file. If anything
36 * goes wrong during those checks then the call will die out
37 * immediately.
38 */
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39
40 SHA1_Init(&ctx);
079afb18
SP
41 while (offset < pack_sig) {
42 unsigned int remaining;
43 unsigned char *in = use_pack(p, w_curs, offset, &remaining);
44 offset += remaining;
45 if (offset > pack_sig)
c4001d92 46 remaining -= (unsigned int)(offset - pack_sig);
079afb18
SP
47 SHA1_Update(&ctx, in, remaining);
48 }
f9253394 49 SHA1_Final(sha1, &ctx);
079afb18 50 if (hashcmp(sha1, use_pack(p, w_curs, pack_sig, NULL)))
f9253394
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51 return error("Packfile %s SHA1 mismatch with itself",
52 p->pack_name);
42873078 53 if (hashcmp(sha1, index_base + index_size - 40))
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54 return error("Packfile %s SHA1 mismatch with idx",
55 p->pack_name);
079afb18 56 unuse_pack(w_curs);
f3bf9224
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57
58 /* Make sure everything reachable from idx is valid. Since we
59 * have verified that nr_objects matches between idx and pack,
60 * we do not do scan-streaming check on the pack file.
61 */
57059091 62 nr_objects = p->num_objects;
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63 entries = xmalloc(nr_objects * sizeof(*entries));
64 /* first sort entries by pack offset, since unpacking them is more efficient that way */
65 for (i = 0; i < nr_objects; i++) {
66 entries[i].sha1 = nth_packed_object_sha1(p, i);
67 if (!entries[i].sha1)
68 die("internal error pack-check nth-packed-object");
69 entries[i].offset = find_pack_entry_one(entries[i].sha1, p);
70 if (!entries[i].offset)
71 die("internal error pack-check find-pack-entry-one");
72 }
73 qsort(entries, nr_objects, sizeof(*entries), compare_entries);
74
326bf396 75 for (i = 0, err = 0; i < nr_objects; i++) {
f3bf9224 76 void *data;
21666f1a 77 enum object_type type;
c4001d92 78 unsigned long size;
f3bf9224 79
3af51928 80 data = unpack_entry(p, entries[i].offset, &type, &size);
f3bf9224
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81 if (!data) {
82 err = error("cannot unpack %s from %s",
3af51928 83 sha1_to_hex(entries[i].sha1), p->pack_name);
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84 continue;
85 }
3af51928 86 if (check_sha1_signature(entries[i].sha1, data, size, typename(type))) {
1038f0c0 87 err = error("packed %s from %s is corrupt",
3af51928 88 sha1_to_hex(entries[i].sha1), p->pack_name);
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89 free(data);
90 continue;
91 }
92 free(data);
93 }
3af51928 94 free(entries);
f3bf9224
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95
96 return err;
f9253394
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97}
98
99
ddcf786f 100#define MAX_CHAIN 50
473ab165 101
079afb18 102static void show_pack_info(struct packed_git *p)
f3bf9224 103{
ddcf786f 104 uint32_t nr_objects, i, chain_histogram[MAX_CHAIN+1];
70f5d5d3 105
57059091 106 nr_objects = p->num_objects;
473ab165 107 memset(chain_histogram, 0, sizeof(chain_histogram));
70f5d5d3 108 init_pack_revindex();
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109
110 for (i = 0; i < nr_objects; i++) {
d72308e0
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111 const unsigned char *sha1;
112 unsigned char base_sha1[20];
21666f1a 113 const char *type;
ad8c80a5
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114 unsigned long size;
115 unsigned long store_size;
c4001d92 116 off_t offset;
f8f135c9 117 unsigned int delta_chain_length;
ad8c80a5 118
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119 sha1 = nth_packed_object_sha1(p, i);
120 if (!sha1)
ad8c80a5 121 die("internal error pack-check nth-packed-object");
43057304
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122 offset = find_pack_entry_one(sha1, p);
123 if (!offset)
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124 die("internal error pack-check find-pack-entry-one");
125
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126 type = packed_object_info_detail(p, offset, &size, &store_size,
127 &delta_chain_length,
128 base_sha1);
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129 printf("%s ", sha1_to_hex(sha1));
130 if (!delta_chain_length)
5f4347bb
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131 printf("%-6s %lu %lu %"PRIuMAX"\n",
132 type, size, store_size, (uintmax_t)offset);
473ab165 133 else {
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134 printf("%-6s %lu %lu %"PRIuMAX" %u %s\n",
135 type, size, store_size, (uintmax_t)offset,
ad8c80a5 136 delta_chain_length, sha1_to_hex(base_sha1));
ddcf786f 137 if (delta_chain_length <= MAX_CHAIN)
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138 chain_histogram[delta_chain_length]++;
139 else
140 chain_histogram[0]++;
141 }
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142 }
143
ddcf786f 144 for (i = 0; i <= MAX_CHAIN; i++) {
473ab165
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145 if (!chain_histogram[i])
146 continue;
ddcf786f
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147 printf("chain length = %d: %d object%s\n", i,
148 chain_histogram[i], chain_histogram[i] > 1 ? "s" : "");
473ab165 149 }
ddcf786f
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150 if (chain_histogram[0])
151 printf("chain length > %d: %d object%s\n", MAX_CHAIN,
152 chain_histogram[0], chain_histogram[0] > 1 ? "s" : "");
f3bf9224
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153}
154
155int verify_pack(struct packed_git *p, int verbose)
f9253394 156{
d079837e
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157 off_t index_size;
158 const unsigned char *index_base;
f9253394
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159 SHA_CTX ctx;
160 unsigned char sha1[20];
161 int ret;
162
d079837e
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163 if (open_pack_index(p))
164 return error("packfile %s index not opened", p->pack_name);
165 index_size = p->index_size;
166 index_base = p->index_data;
167
f3bf9224 168 ret = 0;
f9253394
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169 /* Verify SHA1 sum of the index file */
170 SHA1_Init(&ctx);
c4001d92 171 SHA1_Update(&ctx, index_base, (unsigned int)(index_size - 20));
f9253394 172 SHA1_Final(sha1, &ctx);
42873078 173 if (hashcmp(sha1, index_base + index_size - 20))
f3bf9224
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174 ret = error("Packfile index for %s SHA1 mismatch",
175 p->pack_name);
176
177 if (!ret) {
178 /* Verify pack file */
03e79c88
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179 struct pack_window *w_curs = NULL;
180 ret = verify_packfile(p, &w_curs);
181 unuse_pack(&w_curs);
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182 }
183
184 if (verbose) {
185 if (ret)
186 printf("%s: bad\n", p->pack_name);
187 else {
079afb18 188 show_pack_info(p);
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189 printf("%s: ok\n", p->pack_name);
190 }
191 }
f9253394 192
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193 return ret;
194}