refs.c: mark more strings for translation
[git] / pack-check.c
1 #include "cache.h"
2 #include "repository.h"
3 #include "pack.h"
4 #include "pack-revindex.h"
5 #include "progress.h"
6 #include "packfile.h"
7 #include "object-store.h"
8
9 struct idx_entry {
10         off_t                offset;
11         union idx_entry_object {
12                 const unsigned char *hash;
13                 struct object_id *oid;
14         } oid;
15         unsigned int nr;
16 };
17
18 static int compare_entries(const void *e1, const void *e2)
19 {
20         const struct idx_entry *entry1 = e1;
21         const struct idx_entry *entry2 = e2;
22         if (entry1->offset < entry2->offset)
23                 return -1;
24         if (entry1->offset > entry2->offset)
25                 return 1;
26         return 0;
27 }
28
29 int check_pack_crc(struct packed_git *p, struct pack_window **w_curs,
30                    off_t offset, off_t len, unsigned int nr)
31 {
32         const uint32_t *index_crc;
33         uint32_t data_crc = crc32(0, NULL, 0);
34
35         do {
36                 unsigned long avail;
37                 void *data = use_pack(p, w_curs, offset, &avail);
38                 if (avail > len)
39                         avail = len;
40                 data_crc = crc32(data_crc, data, avail);
41                 offset += avail;
42                 len -= avail;
43         } while (len);
44
45         index_crc = p->index_data;
46         index_crc += 2 + 256 + p->num_objects * (the_hash_algo->rawsz/4) + nr;
47
48         return data_crc != ntohl(*index_crc);
49 }
50
51 static int verify_packfile(struct packed_git *p,
52                            struct pack_window **w_curs,
53                            verify_fn fn,
54                            struct progress *progress, uint32_t base_count)
55
56 {
57         off_t index_size = p->index_size;
58         const unsigned char *index_base = p->index_data;
59         git_hash_ctx ctx;
60         unsigned char hash[GIT_MAX_RAWSZ], *pack_sig;
61         off_t offset = 0, pack_sig_ofs = 0;
62         uint32_t nr_objects, i;
63         int err = 0;
64         struct idx_entry *entries;
65
66         if (!is_pack_valid(p))
67                 return error("packfile %s cannot be accessed", p->pack_name);
68
69         the_hash_algo->init_fn(&ctx);
70         do {
71                 unsigned long remaining;
72                 unsigned char *in = use_pack(p, w_curs, offset, &remaining);
73                 offset += remaining;
74                 if (!pack_sig_ofs)
75                         pack_sig_ofs = p->pack_size - the_hash_algo->rawsz;
76                 if (offset > pack_sig_ofs)
77                         remaining -= (unsigned int)(offset - pack_sig_ofs);
78                 the_hash_algo->update_fn(&ctx, in, remaining);
79         } while (offset < pack_sig_ofs);
80         the_hash_algo->final_fn(hash, &ctx);
81         pack_sig = use_pack(p, w_curs, pack_sig_ofs, NULL);
82         if (hashcmp(hash, pack_sig))
83                 err = error("%s pack checksum mismatch",
84                             p->pack_name);
85         if (hashcmp(index_base + index_size - the_hash_algo->hexsz, pack_sig))
86                 err = error("%s pack checksum does not match its index",
87                             p->pack_name);
88         unuse_pack(w_curs);
89
90         /* Make sure everything reachable from idx is valid.  Since we
91          * have verified that nr_objects matches between idx and pack,
92          * we do not do scan-streaming check on the pack file.
93          */
94         nr_objects = p->num_objects;
95         ALLOC_ARRAY(entries, nr_objects + 1);
96         entries[nr_objects].offset = pack_sig_ofs;
97         /* first sort entries by pack offset, since unpacking them is more efficient that way */
98         for (i = 0; i < nr_objects; i++) {
99                 entries[i].oid.hash = nth_packed_object_sha1(p, i);
100                 if (!entries[i].oid.hash)
101                         die("internal error pack-check nth-packed-object");
102                 entries[i].offset = nth_packed_object_offset(p, i);
103                 entries[i].nr = i;
104         }
105         QSORT(entries, nr_objects, compare_entries);
106
107         for (i = 0; i < nr_objects; i++) {
108                 void *data;
109                 enum object_type type;
110                 unsigned long size;
111                 off_t curpos;
112                 int data_valid;
113
114                 if (p->index_version > 1) {
115                         off_t offset = entries[i].offset;
116                         off_t len = entries[i+1].offset - offset;
117                         unsigned int nr = entries[i].nr;
118                         if (check_pack_crc(p, w_curs, offset, len, nr))
119                                 err = error("index CRC mismatch for object %s "
120                                             "from %s at offset %"PRIuMAX"",
121                                             oid_to_hex(entries[i].oid.oid),
122                                             p->pack_name, (uintmax_t)offset);
123                 }
124
125                 curpos = entries[i].offset;
126                 type = unpack_object_header(p, w_curs, &curpos, &size);
127                 unuse_pack(w_curs);
128
129                 if (type == OBJ_BLOB && big_file_threshold <= size) {
130                         /*
131                          * Let check_object_signature() check it with
132                          * the streaming interface; no point slurping
133                          * the data in-core only to discard.
134                          */
135                         data = NULL;
136                         data_valid = 0;
137                 } else {
138                         data = unpack_entry(the_repository, p, entries[i].offset, &type, &size);
139                         data_valid = 1;
140                 }
141
142                 if (data_valid && !data)
143                         err = error("cannot unpack %s from %s at offset %"PRIuMAX"",
144                                     oid_to_hex(entries[i].oid.oid), p->pack_name,
145                                     (uintmax_t)entries[i].offset);
146                 else if (check_object_signature(entries[i].oid.oid, data, size, type_name(type)))
147                         err = error("packed %s from %s is corrupt",
148                                     oid_to_hex(entries[i].oid.oid), p->pack_name);
149                 else if (fn) {
150                         int eaten = 0;
151                         err |= fn(entries[i].oid.oid, type, size, data, &eaten);
152                         if (eaten)
153                                 data = NULL;
154                 }
155                 if (((base_count + i) & 1023) == 0)
156                         display_progress(progress, base_count + i);
157                 free(data);
158
159         }
160         display_progress(progress, base_count + i);
161         free(entries);
162
163         return err;
164 }
165
166 int verify_pack_index(struct packed_git *p)
167 {
168         off_t index_size;
169         const unsigned char *index_base;
170         git_hash_ctx ctx;
171         unsigned char hash[GIT_MAX_RAWSZ];
172         int err = 0;
173
174         if (open_pack_index(p))
175                 return error("packfile %s index not opened", p->pack_name);
176         index_size = p->index_size;
177         index_base = p->index_data;
178
179         /* Verify SHA1 sum of the index file */
180         the_hash_algo->init_fn(&ctx);
181         the_hash_algo->update_fn(&ctx, index_base, (unsigned int)(index_size - the_hash_algo->rawsz));
182         the_hash_algo->final_fn(hash, &ctx);
183         if (hashcmp(hash, index_base + index_size - the_hash_algo->rawsz))
184                 err = error("Packfile index for %s hash mismatch",
185                             p->pack_name);
186         return err;
187 }
188
189 int verify_pack(struct packed_git *p, verify_fn fn,
190                 struct progress *progress, uint32_t base_count)
191 {
192         int err = 0;
193         struct pack_window *w_curs = NULL;
194
195         err |= verify_pack_index(p);
196         if (!p->index_data)
197                 return -1;
198
199         err |= verify_packfile(p, &w_curs, fn, progress, base_count);
200         unuse_pack(&w_curs);
201
202         return err;
203 }