clone: create intermediate directories of destination repo
[git/git.git] / pack-check.c
CommitLineData
f9253394
JH
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;
f9253394 27 SHA_CTX ctx;
62413604
NP
28 unsigned char sha1[20], *pack_sig;
29 off_t offset = 0, pack_sig_ofs = p->pack_size - 20;
326bf396 30 uint32_t nr_objects, i;
62413604 31 int err = 0;
3af51928 32 struct idx_entry *entries;
f9253394 33
079afb18
SP
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 */
f9253394
JH
39
40 SHA1_Init(&ctx);
62413604 41 while (offset < pack_sig_ofs) {
079afb18
SP
42 unsigned int remaining;
43 unsigned char *in = use_pack(p, w_curs, offset, &remaining);
44 offset += remaining;
62413604
NP
45 if (offset > pack_sig_ofs)
46 remaining -= (unsigned int)(offset - pack_sig_ofs);
079afb18
SP
47 SHA1_Update(&ctx, in, remaining);
48 }
f9253394 49 SHA1_Final(sha1, &ctx);
62413604
NP
50 pack_sig = use_pack(p, w_curs, pack_sig_ofs, NULL);
51 if (hashcmp(sha1, pack_sig))
52 err = error("%s SHA1 checksum mismatch",
53 p->pack_name);
54 if (hashcmp(index_base + index_size - 40, pack_sig))
55 err = error("%s SHA1 does not match its inddex",
56 p->pack_name);
079afb18 57 unuse_pack(w_curs);
f3bf9224
JH
58
59 /* Make sure everything reachable from idx is valid. Since we
60 * have verified that nr_objects matches between idx and pack,
61 * we do not do scan-streaming check on the pack file.
62 */
57059091 63 nr_objects = p->num_objects;
3af51928
AJ
64 entries = xmalloc(nr_objects * sizeof(*entries));
65 /* first sort entries by pack offset, since unpacking them is more efficient that way */
66 for (i = 0; i < nr_objects; i++) {
67 entries[i].sha1 = nth_packed_object_sha1(p, i);
68 if (!entries[i].sha1)
69 die("internal error pack-check nth-packed-object");
70 entries[i].offset = find_pack_entry_one(entries[i].sha1, p);
71 if (!entries[i].offset)
72 die("internal error pack-check find-pack-entry-one");
73 }
74 qsort(entries, nr_objects, sizeof(*entries), compare_entries);
75
62413604 76 for (i = 0; i < nr_objects; i++) {
f3bf9224 77 void *data;
21666f1a 78 enum object_type type;
c4001d92 79 unsigned long size;
f3bf9224 80
3af51928 81 data = unpack_entry(p, entries[i].offset, &type, &size);
f3bf9224 82 if (!data) {
62413604
NP
83 err = error("cannot unpack %s from %s at offset %"PRIuMAX"",
84 sha1_to_hex(entries[i].sha1), p->pack_name,
85 (uintmax_t)entries[i].offset);
86 break;
f3bf9224 87 }
3af51928 88 if (check_sha1_signature(entries[i].sha1, data, size, typename(type))) {
1038f0c0 89 err = error("packed %s from %s is corrupt",
3af51928 90 sha1_to_hex(entries[i].sha1), p->pack_name);
f3bf9224 91 free(data);
62413604 92 break;
f3bf9224
JH
93 }
94 free(data);
95 }
3af51928 96 free(entries);
f3bf9224
JH
97
98 return err;
f9253394
JH
99}
100
101
ddcf786f 102#define MAX_CHAIN 50
473ab165 103
079afb18 104static void show_pack_info(struct packed_git *p)
f3bf9224 105{
ddcf786f 106 uint32_t nr_objects, i, chain_histogram[MAX_CHAIN+1];
70f5d5d3 107
57059091 108 nr_objects = p->num_objects;
473ab165 109 memset(chain_histogram, 0, sizeof(chain_histogram));
ad8c80a5
JH
110
111 for (i = 0; i < nr_objects; i++) {
d72308e0
NP
112 const unsigned char *sha1;
113 unsigned char base_sha1[20];
21666f1a 114 const char *type;
ad8c80a5
JH
115 unsigned long size;
116 unsigned long store_size;
c4001d92 117 off_t offset;
f8f135c9 118 unsigned int delta_chain_length;
ad8c80a5 119
d72308e0
NP
120 sha1 = nth_packed_object_sha1(p, i);
121 if (!sha1)
ad8c80a5 122 die("internal error pack-check nth-packed-object");
43057304
NP
123 offset = find_pack_entry_one(sha1, p);
124 if (!offset)
ad8c80a5
JH
125 die("internal error pack-check find-pack-entry-one");
126
21666f1a
NP
127 type = packed_object_info_detail(p, offset, &size, &store_size,
128 &delta_chain_length,
129 base_sha1);
ad8c80a5
JH
130 printf("%s ", sha1_to_hex(sha1));
131 if (!delta_chain_length)
5f4347bb
NP
132 printf("%-6s %lu %lu %"PRIuMAX"\n",
133 type, size, store_size, (uintmax_t)offset);
473ab165 134 else {
5f4347bb
NP
135 printf("%-6s %lu %lu %"PRIuMAX" %u %s\n",
136 type, size, store_size, (uintmax_t)offset,
ad8c80a5 137 delta_chain_length, sha1_to_hex(base_sha1));
ddcf786f 138 if (delta_chain_length <= MAX_CHAIN)
473ab165
JH
139 chain_histogram[delta_chain_length]++;
140 else
141 chain_histogram[0]++;
142 }
ad8c80a5
JH
143 }
144
ddcf786f 145 for (i = 0; i <= MAX_CHAIN; i++) {
473ab165
JH
146 if (!chain_histogram[i])
147 continue;
ddcf786f
NP
148 printf("chain length = %d: %d object%s\n", i,
149 chain_histogram[i], chain_histogram[i] > 1 ? "s" : "");
473ab165 150 }
ddcf786f
NP
151 if (chain_histogram[0])
152 printf("chain length > %d: %d object%s\n", MAX_CHAIN,
153 chain_histogram[0], chain_histogram[0] > 1 ? "s" : "");
f3bf9224
JH
154}
155
156int verify_pack(struct packed_git *p, int verbose)
f9253394 157{
d079837e
SP
158 off_t index_size;
159 const unsigned char *index_base;
f9253394
JH
160 SHA_CTX ctx;
161 unsigned char sha1[20];
62413604
NP
162 int err = 0;
163 struct pack_window *w_curs = NULL;
f9253394 164
d079837e
SP
165 if (open_pack_index(p))
166 return error("packfile %s index not opened", p->pack_name);
167 index_size = p->index_size;
168 index_base = p->index_data;
169
f9253394
JH
170 /* Verify SHA1 sum of the index file */
171 SHA1_Init(&ctx);
c4001d92 172 SHA1_Update(&ctx, index_base, (unsigned int)(index_size - 20));
f9253394 173 SHA1_Final(sha1, &ctx);
42873078 174 if (hashcmp(sha1, index_base + index_size - 20))
62413604 175 err = error("Packfile index for %s SHA1 mismatch",
f3bf9224
JH
176 p->pack_name);
177
62413604
NP
178 /* Verify pack file */
179 err |= verify_packfile(p, &w_curs);
180 unuse_pack(&w_curs);
f3bf9224
JH
181
182 if (verbose) {
62413604 183 if (err)
f3bf9224
JH
184 printf("%s: bad\n", p->pack_name);
185 else {
079afb18 186 show_pack_info(p);
f3bf9224
JH
187 printf("%s: ok\n", p->pack_name);
188 }
189 }
f9253394 190
62413604 191 return err;
f9253394 192}