git-p4: auto-size the block
[git.git] / pack-check.c
blob385d964bdd1691b962250ec5a49abf2253ca75c1
1 #include "cache.h"
2 #include "pack.h"
3 #include "pack-revindex.h"
4 #include "progress.h"
5 #include "packfile.h"
6 #include "object-store.h"
8 struct idx_entry {
9 off_t offset;
10 union idx_entry_object {
11 const unsigned char *hash;
12 struct object_id *oid;
13 } oid;
14 unsigned int nr;
17 static int compare_entries(const void *e1, const void *e2)
19 const struct idx_entry *entry1 = e1;
20 const struct idx_entry *entry2 = e2;
21 if (entry1->offset < entry2->offset)
22 return -1;
23 if (entry1->offset > entry2->offset)
24 return 1;
25 return 0;
28 int check_pack_crc(struct packed_git *p, struct pack_window **w_curs,
29 off_t offset, off_t len, unsigned int nr)
31 const uint32_t *index_crc;
32 uint32_t data_crc = crc32(0, NULL, 0);
34 do {
35 unsigned long avail;
36 void *data = use_pack(p, w_curs, offset, &avail);
37 if (avail > len)
38 avail = len;
39 data_crc = crc32(data_crc, data, avail);
40 offset += avail;
41 len -= avail;
42 } while (len);
44 index_crc = p->index_data;
45 index_crc += 2 + 256 + p->num_objects * (the_hash_algo->rawsz/4) + nr;
47 return data_crc != ntohl(*index_crc);
50 static int verify_packfile(struct packed_git *p,
51 struct pack_window **w_curs,
52 verify_fn fn,
53 struct progress *progress, uint32_t base_count)
56 off_t index_size = p->index_size;
57 const unsigned char *index_base = p->index_data;
58 git_hash_ctx ctx;
59 unsigned char hash[GIT_MAX_RAWSZ], *pack_sig;
60 off_t offset = 0, pack_sig_ofs = 0;
61 uint32_t nr_objects, i;
62 int err = 0;
63 struct idx_entry *entries;
65 if (!is_pack_valid(p))
66 return error("packfile %s cannot be accessed", p->pack_name);
68 the_hash_algo->init_fn(&ctx);
69 do {
70 unsigned long remaining;
71 unsigned char *in = use_pack(p, w_curs, offset, &remaining);
72 offset += remaining;
73 if (!pack_sig_ofs)
74 pack_sig_ofs = p->pack_size - the_hash_algo->rawsz;
75 if (offset > pack_sig_ofs)
76 remaining -= (unsigned int)(offset - pack_sig_ofs);
77 the_hash_algo->update_fn(&ctx, in, remaining);
78 } while (offset < pack_sig_ofs);
79 the_hash_algo->final_fn(hash, &ctx);
80 pack_sig = use_pack(p, w_curs, pack_sig_ofs, NULL);
81 if (hashcmp(hash, pack_sig))
82 err = error("%s pack checksum mismatch",
83 p->pack_name);
84 if (hashcmp(index_base + index_size - the_hash_algo->hexsz, pack_sig))
85 err = error("%s pack checksum does not match its index",
86 p->pack_name);
87 unuse_pack(w_curs);
89 /* Make sure everything reachable from idx is valid. Since we
90 * have verified that nr_objects matches between idx and pack,
91 * we do not do scan-streaming check on the pack file.
93 nr_objects = p->num_objects;
94 ALLOC_ARRAY(entries, nr_objects + 1);
95 entries[nr_objects].offset = pack_sig_ofs;
96 /* first sort entries by pack offset, since unpacking them is more efficient that way */
97 for (i = 0; i < nr_objects; i++) {
98 entries[i].oid.hash = nth_packed_object_sha1(p, i);
99 if (!entries[i].oid.hash)
100 die("internal error pack-check nth-packed-object");
101 entries[i].offset = nth_packed_object_offset(p, i);
102 entries[i].nr = i;
104 QSORT(entries, nr_objects, compare_entries);
106 for (i = 0; i < nr_objects; i++) {
107 void *data;
108 enum object_type type;
109 unsigned long size;
110 off_t curpos;
111 int data_valid;
113 if (p->index_version > 1) {
114 off_t offset = entries[i].offset;
115 off_t len = entries[i+1].offset - offset;
116 unsigned int nr = entries[i].nr;
117 if (check_pack_crc(p, w_curs, offset, len, nr))
118 err = error("index CRC mismatch for object %s "
119 "from %s at offset %"PRIuMAX"",
120 oid_to_hex(entries[i].oid.oid),
121 p->pack_name, (uintmax_t)offset);
124 curpos = entries[i].offset;
125 type = unpack_object_header(p, w_curs, &curpos, &size);
126 unuse_pack(w_curs);
128 if (type == OBJ_BLOB && big_file_threshold <= size) {
130 * Let check_object_signature() check it with
131 * the streaming interface; no point slurping
132 * the data in-core only to discard.
134 data = NULL;
135 data_valid = 0;
136 } else {
137 data = unpack_entry(p, entries[i].offset, &type, &size);
138 data_valid = 1;
141 if (data_valid && !data)
142 err = error("cannot unpack %s from %s at offset %"PRIuMAX"",
143 oid_to_hex(entries[i].oid.oid), p->pack_name,
144 (uintmax_t)entries[i].offset);
145 else if (check_object_signature(entries[i].oid.oid, data, size, type_name(type)))
146 err = error("packed %s from %s is corrupt",
147 oid_to_hex(entries[i].oid.oid), p->pack_name);
148 else if (fn) {
149 int eaten = 0;
150 err |= fn(entries[i].oid.oid, type, size, data, &eaten);
151 if (eaten)
152 data = NULL;
154 if (((base_count + i) & 1023) == 0)
155 display_progress(progress, base_count + i);
156 free(data);
159 display_progress(progress, base_count + i);
160 free(entries);
162 return err;
165 int verify_pack_index(struct packed_git *p)
167 off_t index_size;
168 const unsigned char *index_base;
169 git_hash_ctx ctx;
170 unsigned char hash[GIT_MAX_RAWSZ];
171 int err = 0;
173 if (open_pack_index(p))
174 return error("packfile %s index not opened", p->pack_name);
175 index_size = p->index_size;
176 index_base = p->index_data;
178 /* Verify SHA1 sum of the index file */
179 the_hash_algo->init_fn(&ctx);
180 the_hash_algo->update_fn(&ctx, index_base, (unsigned int)(index_size - the_hash_algo->rawsz));
181 the_hash_algo->final_fn(hash, &ctx);
182 if (hashcmp(hash, index_base + index_size - the_hash_algo->rawsz))
183 err = error("Packfile index for %s hash mismatch",
184 p->pack_name);
185 return err;
188 int verify_pack(struct packed_git *p, verify_fn fn,
189 struct progress *progress, uint32_t base_count)
191 int err = 0;
192 struct pack_window *w_curs = NULL;
194 err |= verify_pack_index(p);
195 if (!p->index_data)
196 return -1;
198 err |= verify_packfile(p, &w_curs, fn, progress, base_count);
199 unuse_pack(&w_curs);
201 return err;