Merge branch 'es/doc-worktree-guessremote-config'
[git.git] / pack-check.c
blob2cc3603189b8cd27781fd16cba2eb10a16817038
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"
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;
18 static int compare_entries(const void *e1, const void *e2)
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;
29 int check_pack_crc(struct packed_git *p, struct pack_window **w_curs,
30 off_t offset, off_t len, unsigned int nr)
32 const uint32_t *index_crc;
33 uint32_t data_crc = crc32(0, NULL, 0);
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);
45 index_crc = p->index_data;
46 index_crc += 2 + 256 + p->num_objects * (the_hash_algo->rawsz/4) + nr;
48 return data_crc != ntohl(*index_crc);
51 static int verify_packfile(struct repository *r,
52 struct packed_git *p,
53 struct pack_window **w_curs,
54 verify_fn fn,
55 struct progress *progress, uint32_t base_count)
58 off_t index_size = p->index_size;
59 const unsigned char *index_base = p->index_data;
60 git_hash_ctx ctx;
61 unsigned char hash[GIT_MAX_RAWSZ], *pack_sig;
62 off_t offset = 0, pack_sig_ofs = 0;
63 uint32_t nr_objects, i;
64 int err = 0;
65 struct idx_entry *entries;
67 if (!is_pack_valid(p))
68 return error("packfile %s cannot be accessed", p->pack_name);
70 the_hash_algo->init_fn(&ctx);
71 do {
72 unsigned long remaining;
73 unsigned char *in = use_pack(p, w_curs, offset, &remaining);
74 offset += remaining;
75 if (!pack_sig_ofs)
76 pack_sig_ofs = p->pack_size - the_hash_algo->rawsz;
77 if (offset > pack_sig_ofs)
78 remaining -= (unsigned int)(offset - pack_sig_ofs);
79 the_hash_algo->update_fn(&ctx, in, remaining);
80 } while (offset < pack_sig_ofs);
81 the_hash_algo->final_fn(hash, &ctx);
82 pack_sig = use_pack(p, w_curs, pack_sig_ofs, NULL);
83 if (!hasheq(hash, pack_sig))
84 err = error("%s pack checksum mismatch",
85 p->pack_name);
86 if (!hasheq(index_base + index_size - the_hash_algo->hexsz, pack_sig))
87 err = error("%s pack checksum does not match its index",
88 p->pack_name);
89 unuse_pack(w_curs);
91 /* Make sure everything reachable from idx is valid. Since we
92 * have verified that nr_objects matches between idx and pack,
93 * we do not do scan-streaming check on the pack file.
95 nr_objects = p->num_objects;
96 ALLOC_ARRAY(entries, nr_objects + 1);
97 entries[nr_objects].offset = pack_sig_ofs;
98 /* first sort entries by pack offset, since unpacking them is more efficient that way */
99 for (i = 0; i < nr_objects; i++) {
100 entries[i].oid.hash = nth_packed_object_sha1(p, i);
101 if (!entries[i].oid.hash)
102 die("internal error pack-check nth-packed-object");
103 entries[i].offset = nth_packed_object_offset(p, i);
104 entries[i].nr = i;
106 QSORT(entries, nr_objects, compare_entries);
108 for (i = 0; i < nr_objects; i++) {
109 void *data;
110 enum object_type type;
111 unsigned long size;
112 off_t curpos;
113 int data_valid;
115 if (p->index_version > 1) {
116 off_t offset = entries[i].offset;
117 off_t len = entries[i+1].offset - offset;
118 unsigned int nr = entries[i].nr;
119 if (check_pack_crc(p, w_curs, offset, len, nr))
120 err = error("index CRC mismatch for object %s "
121 "from %s at offset %"PRIuMAX"",
122 oid_to_hex(entries[i].oid.oid),
123 p->pack_name, (uintmax_t)offset);
126 curpos = entries[i].offset;
127 type = unpack_object_header(p, w_curs, &curpos, &size);
128 unuse_pack(w_curs);
130 if (type == OBJ_BLOB && big_file_threshold <= size) {
132 * Let check_object_signature() check it with
133 * the streaming interface; no point slurping
134 * the data in-core only to discard.
136 data = NULL;
137 data_valid = 0;
138 } else {
139 data = unpack_entry(r, p, entries[i].offset, &type, &size);
140 data_valid = 1;
143 if (data_valid && !data)
144 err = error("cannot unpack %s from %s at offset %"PRIuMAX"",
145 oid_to_hex(entries[i].oid.oid), p->pack_name,
146 (uintmax_t)entries[i].offset);
147 else if (check_object_signature(entries[i].oid.oid, data, size, type_name(type)))
148 err = error("packed %s from %s is corrupt",
149 oid_to_hex(entries[i].oid.oid), p->pack_name);
150 else if (fn) {
151 int eaten = 0;
152 err |= fn(entries[i].oid.oid, type, size, data, &eaten);
153 if (eaten)
154 data = NULL;
156 if (((base_count + i) & 1023) == 0)
157 display_progress(progress, base_count + i);
158 free(data);
161 display_progress(progress, base_count + i);
162 free(entries);
164 return err;
167 int verify_pack_index(struct packed_git *p)
169 off_t index_size;
170 const unsigned char *index_base;
171 git_hash_ctx ctx;
172 unsigned char hash[GIT_MAX_RAWSZ];
173 int err = 0;
175 if (open_pack_index(p))
176 return error("packfile %s index not opened", p->pack_name);
177 index_size = p->index_size;
178 index_base = p->index_data;
180 /* Verify SHA1 sum of the index file */
181 the_hash_algo->init_fn(&ctx);
182 the_hash_algo->update_fn(&ctx, index_base, (unsigned int)(index_size - the_hash_algo->rawsz));
183 the_hash_algo->final_fn(hash, &ctx);
184 if (!hasheq(hash, index_base + index_size - the_hash_algo->rawsz))
185 err = error("Packfile index for %s hash mismatch",
186 p->pack_name);
187 return err;
190 int verify_pack(struct repository *r, struct packed_git *p, verify_fn fn,
191 struct progress *progress, uint32_t base_count)
193 int err = 0;
194 struct pack_window *w_curs = NULL;
196 err |= verify_pack_index(p);
197 if (!p->index_data)
198 return -1;
200 err |= verify_packfile(r, p, &w_curs, fn, progress, base_count);
201 unuse_pack(&w_curs);
203 return err;