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Commit | Line | Data |
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8b0eca7c DH |
1 | #include "cache.h" |
2 | #include "pack.h" | |
aa7e44bf | 3 | #include "csum-file.h" |
33add2ad | 4 | #include "remote.h" |
d9fef9d9 | 5 | #include "chunk-format.h" |
5dfaf49a TB |
6 | #include "pack-mtimes.h" |
7 | #include "oidmap.h" | |
5dfaf49a | 8 | #include "pack-objects.h" |
aa7e44bf | 9 | |
ebcfb379 JH |
10 | void reset_pack_idx_option(struct pack_idx_option *opts) |
11 | { | |
12 | memset(opts, 0, sizeof(*opts)); | |
13 | opts->version = 2; | |
14 | opts->off32_limit = 0x7fffffff; | |
15 | } | |
aa7e44bf GB |
16 | |
17 | static int sha1_compare(const void *_a, const void *_b) | |
18 | { | |
19 | struct pack_idx_entry *a = *(struct pack_idx_entry **)_a; | |
20 | struct pack_idx_entry *b = *(struct pack_idx_entry **)_b; | |
e6a492b7 | 21 | return oidcmp(&a->oid, &b->oid); |
aa7e44bf GB |
22 | } |
23 | ||
3c9fc074 JH |
24 | static int cmp_uint32(const void *a_, const void *b_) |
25 | { | |
26 | uint32_t a = *((uint32_t *)a_); | |
27 | uint32_t b = *((uint32_t *)b_); | |
28 | ||
29 | return (a < b) ? -1 : (a != b); | |
30 | } | |
31 | ||
fb956c1f JH |
32 | static int need_large_offset(off_t offset, const struct pack_idx_option *opts) |
33 | { | |
3c9fc074 JH |
34 | uint32_t ofsval; |
35 | ||
36 | if ((offset >> 31) || (opts->off32_limit < offset)) | |
37 | return 1; | |
38 | if (!opts->anomaly_nr) | |
39 | return 0; | |
40 | ofsval = offset; | |
41 | return !!bsearch(&ofsval, opts->anomaly, opts->anomaly_nr, | |
42 | sizeof(ofsval), cmp_uint32); | |
fb956c1f JH |
43 | } |
44 | ||
aa7e44bf | 45 | /* |
e2bfa50a JB |
46 | * The *sha1 contains the pack content SHA1 hash. |
47 | * The objects array passed in will be sorted by SHA1 on exit. | |
aa7e44bf | 48 | */ |
3bb72562 | 49 | const char *write_idx_file(const char *index_name, struct pack_idx_entry **objects, |
ebcfb379 | 50 | int nr_objects, const struct pack_idx_option *opts, |
1190a1ac | 51 | const unsigned char *sha1) |
aa7e44bf | 52 | { |
98a3beab | 53 | struct hashfile *f; |
aa7e44bf GB |
54 | struct pack_idx_entry **sorted_by_sha, **list, **last; |
55 | off_t last_obj_offset = 0; | |
aa7e44bf | 56 | int i, fd; |
aa7e44bf GB |
57 | uint32_t index_version; |
58 | ||
59 | if (nr_objects) { | |
60 | sorted_by_sha = objects; | |
61 | list = sorted_by_sha; | |
62 | last = sorted_by_sha + nr_objects; | |
63 | for (i = 0; i < nr_objects; ++i) { | |
64 | if (objects[i]->offset > last_obj_offset) | |
65 | last_obj_offset = objects[i]->offset; | |
66 | } | |
9ed0d8d6 | 67 | QSORT(sorted_by_sha, nr_objects, sha1_compare); |
aa7e44bf GB |
68 | } |
69 | else | |
70 | sorted_by_sha = list = last = NULL; | |
71 | ||
e337a04d JH |
72 | if (opts->flags & WRITE_IDX_VERIFY) { |
73 | assert(index_name); | |
98a3beab | 74 | f = hashfd_check(index_name); |
aa7e44bf | 75 | } else { |
e337a04d | 76 | if (!index_name) { |
594fa999 JK |
77 | struct strbuf tmp_file = STRBUF_INIT; |
78 | fd = odb_mkstemp(&tmp_file, "pack/tmp_idx_XXXXXX"); | |
79 | index_name = strbuf_detach(&tmp_file, NULL); | |
e337a04d JH |
80 | } else { |
81 | unlink(index_name); | |
66e905b7 | 82 | fd = xopen(index_name, O_CREAT|O_EXCL|O_WRONLY, 0600); |
e337a04d | 83 | } |
98a3beab | 84 | f = hashfd(fd, index_name); |
aa7e44bf | 85 | } |
aa7e44bf GB |
86 | |
87 | /* if last object's offset is >= 2^31 we should use index V2 */ | |
fb956c1f | 88 | index_version = need_large_offset(last_obj_offset, opts) ? 2 : opts->version; |
aa7e44bf GB |
89 | |
90 | /* index versions 2 and above need a header */ | |
91 | if (index_version >= 2) { | |
92 | struct pack_idx_header hdr; | |
93 | hdr.idx_signature = htonl(PACK_IDX_SIGNATURE); | |
94 | hdr.idx_version = htonl(index_version); | |
98a3beab | 95 | hashwrite(f, &hdr, sizeof(hdr)); |
aa7e44bf GB |
96 | } |
97 | ||
98 | /* | |
99 | * Write the first-level table (the list is sorted, | |
100 | * but we use a 256-entry lookup to be able to avoid | |
101 | * having to do eight extra binary search iterations). | |
102 | */ | |
103 | for (i = 0; i < 256; i++) { | |
104 | struct pack_idx_entry **next = list; | |
105 | while (next < last) { | |
106 | struct pack_idx_entry *obj = *next; | |
e6a492b7 | 107 | if (obj->oid.hash[0] != i) |
aa7e44bf GB |
108 | break; |
109 | next++; | |
110 | } | |
06d43fad | 111 | hashwrite_be32(f, next - sorted_by_sha); |
aa7e44bf GB |
112 | list = next; |
113 | } | |
aa7e44bf | 114 | |
aa7e44bf GB |
115 | /* |
116 | * Write the actual SHA1 entries.. | |
117 | */ | |
118 | list = sorted_by_sha; | |
119 | for (i = 0; i < nr_objects; i++) { | |
120 | struct pack_idx_entry *obj = *list++; | |
389cf68c RS |
121 | if (index_version < 2) |
122 | hashwrite_be32(f, obj->offset); | |
98a3beab | 123 | hashwrite(f, obj->oid.hash, the_hash_algo->rawsz); |
68be2fea | 124 | if ((opts->flags & WRITE_IDX_STRICT) && |
4a7e27e9 | 125 | (i && oideq(&list[-2]->oid, &obj->oid))) |
68be2fea | 126 | die("The same object %s appears twice in the pack", |
e6a492b7 | 127 | oid_to_hex(&obj->oid)); |
aa7e44bf GB |
128 | } |
129 | ||
130 | if (index_version >= 2) { | |
131 | unsigned int nr_large_offset = 0; | |
132 | ||
133 | /* write the crc32 table */ | |
134 | list = sorted_by_sha; | |
135 | for (i = 0; i < nr_objects; i++) { | |
136 | struct pack_idx_entry *obj = *list++; | |
389cf68c | 137 | hashwrite_be32(f, obj->crc32); |
aa7e44bf GB |
138 | } |
139 | ||
140 | /* write the 32-bit offset table */ | |
141 | list = sorted_by_sha; | |
142 | for (i = 0; i < nr_objects; i++) { | |
143 | struct pack_idx_entry *obj = *list++; | |
fb956c1f JH |
144 | uint32_t offset; |
145 | ||
146 | offset = (need_large_offset(obj->offset, opts) | |
147 | ? (0x80000000 | nr_large_offset++) | |
148 | : obj->offset); | |
389cf68c | 149 | hashwrite_be32(f, offset); |
aa7e44bf GB |
150 | } |
151 | ||
152 | /* write the large offset table */ | |
153 | list = sorted_by_sha; | |
154 | while (nr_large_offset) { | |
155 | struct pack_idx_entry *obj = *list++; | |
156 | uint64_t offset = obj->offset; | |
fb956c1f JH |
157 | |
158 | if (!need_large_offset(offset, opts)) | |
159 | continue; | |
970909c2 | 160 | hashwrite_be64(f, offset); |
fb956c1f | 161 | nr_large_offset--; |
aa7e44bf GB |
162 | } |
163 | } | |
164 | ||
98a3beab | 165 | hashwrite(f, sha1, the_hash_algo->rawsz); |
020406ea NS |
166 | finalize_hashfile(f, NULL, FSYNC_COMPONENT_PACK_METADATA, |
167 | CSUM_HASH_IN_STREAM | CSUM_CLOSE | | |
168 | ((opts->flags & WRITE_IDX_VERIFY) ? 0 : CSUM_FSYNC)); | |
aa7e44bf GB |
169 | return index_name; |
170 | } | |
8b0eca7c | 171 | |
8ef50d99 TB |
172 | static int pack_order_cmp(const void *va, const void *vb, void *ctx) |
173 | { | |
174 | struct pack_idx_entry **objects = ctx; | |
175 | ||
176 | off_t oa = objects[*(uint32_t*)va]->offset; | |
177 | off_t ob = objects[*(uint32_t*)vb]->offset; | |
178 | ||
179 | if (oa < ob) | |
180 | return -1; | |
181 | if (oa > ob) | |
182 | return 1; | |
183 | return 0; | |
184 | } | |
185 | ||
186 | static void write_rev_header(struct hashfile *f) | |
187 | { | |
8ef50d99 TB |
188 | hashwrite_be32(f, RIDX_SIGNATURE); |
189 | hashwrite_be32(f, RIDX_VERSION); | |
d9fef9d9 | 190 | hashwrite_be32(f, oid_version(the_hash_algo)); |
8ef50d99 TB |
191 | } |
192 | ||
193 | static void write_rev_index_positions(struct hashfile *f, | |
a587b5a7 | 194 | uint32_t *pack_order, |
8ef50d99 TB |
195 | uint32_t nr_objects) |
196 | { | |
8ef50d99 | 197 | uint32_t i; |
8ef50d99 TB |
198 | for (i = 0; i < nr_objects; i++) |
199 | hashwrite_be32(f, pack_order[i]); | |
8ef50d99 TB |
200 | } |
201 | ||
202 | static void write_rev_trailer(struct hashfile *f, const unsigned char *hash) | |
203 | { | |
204 | hashwrite(f, hash, the_hash_algo->rawsz); | |
205 | } | |
206 | ||
207 | const char *write_rev_file(const char *rev_name, | |
208 | struct pack_idx_entry **objects, | |
209 | uint32_t nr_objects, | |
210 | const unsigned char *hash, | |
211 | unsigned flags) | |
a587b5a7 TB |
212 | { |
213 | uint32_t *pack_order; | |
214 | uint32_t i; | |
215 | const char *ret; | |
216 | ||
8fe8bae9 ÆAB |
217 | if (!(flags & WRITE_REV) && !(flags & WRITE_REV_VERIFY)) |
218 | return NULL; | |
219 | ||
a587b5a7 TB |
220 | ALLOC_ARRAY(pack_order, nr_objects); |
221 | for (i = 0; i < nr_objects; i++) | |
222 | pack_order[i] = i; | |
223 | QSORT_S(pack_order, nr_objects, pack_order_cmp, objects); | |
224 | ||
225 | ret = write_rev_file_order(rev_name, pack_order, nr_objects, hash, | |
226 | flags); | |
227 | ||
228 | free(pack_order); | |
229 | ||
230 | return ret; | |
231 | } | |
232 | ||
233 | const char *write_rev_file_order(const char *rev_name, | |
234 | uint32_t *pack_order, | |
235 | uint32_t nr_objects, | |
236 | const unsigned char *hash, | |
237 | unsigned flags) | |
8ef50d99 TB |
238 | { |
239 | struct hashfile *f; | |
240 | int fd; | |
241 | ||
242 | if ((flags & WRITE_REV) && (flags & WRITE_REV_VERIFY)) | |
243 | die(_("cannot both write and verify reverse index")); | |
244 | ||
245 | if (flags & WRITE_REV) { | |
246 | if (!rev_name) { | |
247 | struct strbuf tmp_file = STRBUF_INIT; | |
248 | fd = odb_mkstemp(&tmp_file, "pack/tmp_rev_XXXXXX"); | |
249 | rev_name = strbuf_detach(&tmp_file, NULL); | |
250 | } else { | |
251 | unlink(rev_name); | |
66e905b7 | 252 | fd = xopen(rev_name, O_CREAT|O_EXCL|O_WRONLY, 0600); |
8ef50d99 TB |
253 | } |
254 | f = hashfd(fd, rev_name); | |
255 | } else if (flags & WRITE_REV_VERIFY) { | |
256 | struct stat statbuf; | |
257 | if (stat(rev_name, &statbuf)) { | |
258 | if (errno == ENOENT) { | |
259 | /* .rev files are optional */ | |
260 | return NULL; | |
261 | } else | |
262 | die_errno(_("could not stat: %s"), rev_name); | |
263 | } | |
264 | f = hashfd_check(rev_name); | |
265 | } else | |
266 | return NULL; | |
267 | ||
268 | write_rev_header(f); | |
269 | ||
a587b5a7 | 270 | write_rev_index_positions(f, pack_order, nr_objects); |
8ef50d99 TB |
271 | write_rev_trailer(f, hash); |
272 | ||
273 | if (rev_name && adjust_shared_perm(rev_name) < 0) | |
274 | die(_("failed to make %s readable"), rev_name); | |
275 | ||
020406ea NS |
276 | finalize_hashfile(f, NULL, FSYNC_COMPONENT_PACK_METADATA, |
277 | CSUM_HASH_IN_STREAM | CSUM_CLOSE | | |
278 | ((flags & WRITE_IDX_VERIFY) ? 0 : CSUM_FSYNC)); | |
8ef50d99 TB |
279 | |
280 | return rev_name; | |
281 | } | |
282 | ||
5dfaf49a TB |
283 | static void write_mtimes_header(struct hashfile *f) |
284 | { | |
285 | hashwrite_be32(f, MTIMES_SIGNATURE); | |
286 | hashwrite_be32(f, MTIMES_VERSION); | |
287 | hashwrite_be32(f, oid_version(the_hash_algo)); | |
288 | } | |
289 | ||
290 | /* | |
291 | * Writes the object mtimes of "objects" for use in a .mtimes file. | |
292 | * Note that objects must be in lexicographic (index) order, which is | |
293 | * the expected ordering of these values in the .mtimes file. | |
294 | */ | |
295 | static void write_mtimes_objects(struct hashfile *f, | |
296 | struct packing_data *to_pack, | |
297 | struct pack_idx_entry **objects, | |
298 | uint32_t nr_objects) | |
299 | { | |
300 | uint32_t i; | |
301 | for (i = 0; i < nr_objects; i++) { | |
302 | struct object_entry *e = (struct object_entry*)objects[i]; | |
303 | hashwrite_be32(f, oe_cruft_mtime(to_pack, e)); | |
304 | } | |
305 | } | |
306 | ||
307 | static void write_mtimes_trailer(struct hashfile *f, const unsigned char *hash) | |
308 | { | |
309 | hashwrite(f, hash, the_hash_algo->rawsz); | |
310 | } | |
311 | ||
82db195e | 312 | static const char *write_mtimes_file(struct packing_data *to_pack, |
5dfaf49a TB |
313 | struct pack_idx_entry **objects, |
314 | uint32_t nr_objects, | |
315 | const unsigned char *hash) | |
316 | { | |
82db195e DS |
317 | struct strbuf tmp_file = STRBUF_INIT; |
318 | const char *mtimes_name; | |
5dfaf49a TB |
319 | struct hashfile *f; |
320 | int fd; | |
321 | ||
322 | if (!to_pack) | |
323 | BUG("cannot call write_mtimes_file with NULL packing_data"); | |
324 | ||
82db195e DS |
325 | fd = odb_mkstemp(&tmp_file, "pack/tmp_mtimes_XXXXXX"); |
326 | mtimes_name = strbuf_detach(&tmp_file, NULL); | |
5dfaf49a TB |
327 | f = hashfd(fd, mtimes_name); |
328 | ||
329 | write_mtimes_header(f); | |
330 | write_mtimes_objects(f, to_pack, objects, nr_objects); | |
331 | write_mtimes_trailer(f, hash); | |
332 | ||
333 | if (adjust_shared_perm(mtimes_name) < 0) | |
334 | die(_("failed to make %s readable"), mtimes_name); | |
335 | ||
336 | finalize_hashfile(f, NULL, FSYNC_COMPONENT_PACK_METADATA, | |
337 | CSUM_HASH_IN_STREAM | CSUM_CLOSE | CSUM_FSYNC); | |
338 | ||
339 | return mtimes_name; | |
340 | } | |
341 | ||
98a3beab | 342 | off_t write_pack_header(struct hashfile *f, uint32_t nr_entries) |
c0ad4657 JH |
343 | { |
344 | struct pack_header hdr; | |
345 | ||
346 | hdr.hdr_signature = htonl(PACK_SIGNATURE); | |
347 | hdr.hdr_version = htonl(PACK_VERSION); | |
348 | hdr.hdr_entries = htonl(nr_entries); | |
98a3beab | 349 | hashwrite(f, &hdr, sizeof(hdr)); |
c0ad4657 JH |
350 | return sizeof(hdr); |
351 | } | |
352 | ||
abeb40e5 NP |
353 | /* |
354 | * Update pack header with object_count and compute new SHA1 for pack data | |
355 | * associated to pack_fd, and write that SHA1 at the end. That new SHA1 | |
356 | * is also returned in new_pack_sha1. | |
357 | * | |
358 | * If partial_pack_sha1 is non null, then the SHA1 of the existing pack | |
359 | * (without the header update) is computed and validated against the | |
360 | * one provided in partial_pack_sha1. The validation is performed at | |
361 | * partial_pack_offset bytes in the pack file. The SHA1 of the remaining | |
362 | * data (i.e. from partial_pack_offset to the end) is then computed and | |
363 | * returned in partial_pack_sha1. | |
364 | * | |
365 | * Note that new_pack_sha1 is updated last, so both new_pack_sha1 and | |
366 | * partial_pack_sha1 can refer to the same buffer if the caller is not | |
367 | * interested in the resulting SHA1 of pack data above partial_pack_offset. | |
368 | */ | |
8b0eca7c | 369 | void fixup_pack_header_footer(int pack_fd, |
81c58cd4 | 370 | unsigned char *new_pack_hash, |
8b0eca7c | 371 | const char *pack_name, |
abeb40e5 | 372 | uint32_t object_count, |
81c58cd4 | 373 | unsigned char *partial_pack_hash, |
abeb40e5 | 374 | off_t partial_pack_offset) |
8b0eca7c | 375 | { |
d35825da | 376 | int aligned_sz, buf_sz = 8 * 1024; |
81c58cd4 | 377 | git_hash_ctx old_hash_ctx, new_hash_ctx; |
8b0eca7c DH |
378 | struct pack_header hdr; |
379 | char *buf; | |
90dca671 | 380 | ssize_t read_result; |
8b0eca7c | 381 | |
81c58cd4 | 382 | the_hash_algo->init_fn(&old_hash_ctx); |
383 | the_hash_algo->init_fn(&new_hash_ctx); | |
abeb40e5 | 384 | |
8b0eca7c | 385 | if (lseek(pack_fd, 0, SEEK_SET) != 0) |
d824cbba | 386 | die_errno("Failed seeking to start of '%s'", pack_name); |
90dca671 JK |
387 | read_result = read_in_full(pack_fd, &hdr, sizeof(hdr)); |
388 | if (read_result < 0) | |
d824cbba | 389 | die_errno("Unable to reread header of '%s'", pack_name); |
90dca671 JK |
390 | else if (read_result != sizeof(hdr)) |
391 | die_errno("Unexpected short read for header of '%s'", | |
392 | pack_name); | |
8b0eca7c | 393 | if (lseek(pack_fd, 0, SEEK_SET) != 0) |
d824cbba | 394 | die_errno("Failed seeking to start of '%s'", pack_name); |
81c58cd4 | 395 | the_hash_algo->update_fn(&old_hash_ctx, &hdr, sizeof(hdr)); |
8b0eca7c | 396 | hdr.hdr_entries = htonl(object_count); |
81c58cd4 | 397 | the_hash_algo->update_fn(&new_hash_ctx, &hdr, sizeof(hdr)); |
8b0eca7c | 398 | write_or_die(pack_fd, &hdr, sizeof(hdr)); |
abeb40e5 | 399 | partial_pack_offset -= sizeof(hdr); |
8b0eca7c DH |
400 | |
401 | buf = xmalloc(buf_sz); | |
d35825da | 402 | aligned_sz = buf_sz - sizeof(hdr); |
8b0eca7c | 403 | for (;;) { |
abeb40e5 | 404 | ssize_t m, n; |
81c58cd4 | 405 | m = (partial_pack_hash && partial_pack_offset < aligned_sz) ? |
d35825da | 406 | partial_pack_offset : aligned_sz; |
abeb40e5 | 407 | n = xread(pack_fd, buf, m); |
8b0eca7c DH |
408 | if (!n) |
409 | break; | |
410 | if (n < 0) | |
d824cbba | 411 | die_errno("Failed to checksum '%s'", pack_name); |
81c58cd4 | 412 | the_hash_algo->update_fn(&new_hash_ctx, buf, n); |
abeb40e5 | 413 | |
d35825da NP |
414 | aligned_sz -= n; |
415 | if (!aligned_sz) | |
416 | aligned_sz = buf_sz; | |
417 | ||
81c58cd4 | 418 | if (!partial_pack_hash) |
abeb40e5 NP |
419 | continue; |
420 | ||
81c58cd4 | 421 | the_hash_algo->update_fn(&old_hash_ctx, buf, n); |
abeb40e5 NP |
422 | partial_pack_offset -= n; |
423 | if (partial_pack_offset == 0) { | |
81c58cd4 | 424 | unsigned char hash[GIT_MAX_RAWSZ]; |
425 | the_hash_algo->final_fn(hash, &old_hash_ctx); | |
67947c34 | 426 | if (!hasheq(hash, partial_pack_hash)) |
abeb40e5 NP |
427 | die("Unexpected checksum for %s " |
428 | "(disk corruption?)", pack_name); | |
429 | /* | |
430 | * Now let's compute the SHA1 of the remainder of the | |
431 | * pack, which also means making partial_pack_offset | |
432 | * big enough not to matter anymore. | |
433 | */ | |
81c58cd4 | 434 | the_hash_algo->init_fn(&old_hash_ctx); |
abeb40e5 NP |
435 | partial_pack_offset = ~partial_pack_offset; |
436 | partial_pack_offset -= MSB(partial_pack_offset, 1); | |
437 | } | |
8b0eca7c DH |
438 | } |
439 | free(buf); | |
440 | ||
81c58cd4 | 441 | if (partial_pack_hash) |
442 | the_hash_algo->final_fn(partial_pack_hash, &old_hash_ctx); | |
443 | the_hash_algo->final_fn(new_pack_hash, &new_hash_ctx); | |
444 | write_or_die(pack_fd, new_pack_hash, the_hash_algo->rawsz); | |
020406ea | 445 | fsync_component_or_die(FSYNC_COMPONENT_PACK, pack_fd, pack_name); |
8b0eca7c | 446 | } |
106764e6 | 447 | |
5476e1ef | 448 | char *index_pack_lockfile(int ip_out, int *is_well_formed) |
106764e6 | 449 | { |
81c58cd4 | 450 | char packname[GIT_MAX_HEXSZ + 6]; |
451 | const int len = the_hash_algo->hexsz + 6; | |
106764e6 SP |
452 | |
453 | /* | |
6e180cdc | 454 | * The first thing we expect from index-pack's output |
106764e6 SP |
455 | * is "pack\t%40s\n" or "keep\t%40s\n" (46 bytes) where |
456 | * %40s is the newly created pack SHA1 name. In the "keep" | |
457 | * case, we need it to remove the corresponding .keep file | |
458 | * later on. If we don't get that then tough luck with it. | |
459 | */ | |
81c58cd4 | 460 | if (read_in_full(ip_out, packname, len) == len && packname[len-1] == '\n') { |
d7731444 | 461 | const char *name; |
5476e1ef JT |
462 | |
463 | if (is_well_formed) | |
464 | *is_well_formed = 1; | |
81c58cd4 | 465 | packname[len-1] = 0; |
d7731444 RS |
466 | if (skip_prefix(packname, "keep\t", &name)) |
467 | return xstrfmt("%s/pack/pack-%s.keep", | |
468 | get_object_directory(), name); | |
5476e1ef | 469 | return NULL; |
106764e6 | 470 | } |
5476e1ef JT |
471 | if (is_well_formed) |
472 | *is_well_formed = 0; | |
106764e6 SP |
473 | return NULL; |
474 | } | |
f965c525 NP |
475 | |
476 | /* | |
477 | * The per-object header is a pretty dense thing, which is | |
478 | * - first byte: low four bits are "size", then three bits of "type", | |
479 | * and the high bit is "size continues". | |
480 | * - each byte afterwards: low seven bits are size continuation, | |
481 | * with the high bit being "size continues" | |
482 | */ | |
7202a6fa JK |
483 | int encode_in_pack_object_header(unsigned char *hdr, int hdr_len, |
484 | enum object_type type, uintmax_t size) | |
f965c525 NP |
485 | { |
486 | int n = 1; | |
487 | unsigned char c; | |
488 | ||
489 | if (type < OBJ_COMMIT || type > OBJ_REF_DELTA) | |
490 | die("bad type %d", type); | |
491 | ||
492 | c = (type << 4) | (size & 15); | |
493 | size >>= 4; | |
494 | while (size) { | |
7202a6fa JK |
495 | if (n == hdr_len) |
496 | die("object size is too enormous to format"); | |
f965c525 NP |
497 | *hdr++ = c | 0x80; |
498 | c = size & 0x7f; | |
499 | size >>= 7; | |
500 | n++; | |
501 | } | |
502 | *hdr = c; | |
503 | return n; | |
504 | } | |
cdf9db3c | 505 | |
98a3beab | 506 | struct hashfile *create_tmp_packfile(char **pack_tmp_name) |
cdf9db3c | 507 | { |
594fa999 | 508 | struct strbuf tmpname = STRBUF_INIT; |
cdf9db3c JH |
509 | int fd; |
510 | ||
594fa999 JK |
511 | fd = odb_mkstemp(&tmpname, "pack/tmp_pack_XXXXXX"); |
512 | *pack_tmp_name = strbuf_detach(&tmpname, NULL); | |
98a3beab | 513 | return hashfd(fd, *pack_tmp_name); |
cdf9db3c | 514 | } |
0e990530 | 515 | |
66833f0e ÆAB |
516 | static void rename_tmp_packfile(struct strbuf *name_prefix, const char *source, |
517 | const char *ext) | |
518 | { | |
519 | size_t name_prefix_len = name_prefix->len; | |
520 | ||
521 | strbuf_addstr(name_prefix, ext); | |
522 | if (rename(source, name_prefix->buf)) | |
523 | die_errno("unable to rename temporary file to '%s'", | |
524 | name_prefix->buf); | |
525 | strbuf_setlen(name_prefix, name_prefix_len); | |
526 | } | |
527 | ||
2ec02dd5 ÆAB |
528 | void rename_tmp_packfile_idx(struct strbuf *name_buffer, |
529 | char **idx_tmp_name) | |
530 | { | |
531 | rename_tmp_packfile(name_buffer, *idx_tmp_name, "idx"); | |
532 | } | |
533 | ||
534 | void stage_tmp_packfiles(struct strbuf *name_buffer, | |
0e990530 JH |
535 | const char *pack_tmp_name, |
536 | struct pack_idx_entry **written_list, | |
537 | uint32_t nr_written, | |
1c573cdd | 538 | struct packing_data *to_pack, |
0e990530 | 539 | struct pack_idx_option *pack_idx_opts, |
2ec02dd5 ÆAB |
540 | unsigned char hash[], |
541 | char **idx_tmp_name) | |
0e990530 | 542 | { |
2ec02dd5 | 543 | const char *rev_tmp_name = NULL; |
5dfaf49a | 544 | const char *mtimes_tmp_name = NULL; |
0e990530 JH |
545 | |
546 | if (adjust_shared_perm(pack_tmp_name)) | |
547 | die_errno("unable to make temporary pack file readable"); | |
548 | ||
2ec02dd5 ÆAB |
549 | *idx_tmp_name = (char *)write_idx_file(NULL, written_list, nr_written, |
550 | pack_idx_opts, hash); | |
551 | if (adjust_shared_perm(*idx_tmp_name)) | |
0e990530 JH |
552 | die_errno("unable to make temporary index file readable"); |
553 | ||
8ef50d99 TB |
554 | rev_tmp_name = write_rev_file(NULL, written_list, nr_written, hash, |
555 | pack_idx_opts->flags); | |
556 | ||
5dfaf49a | 557 | if (pack_idx_opts->flags & WRITE_MTIMES) { |
82db195e | 558 | mtimes_tmp_name = write_mtimes_file(to_pack, written_list, |
5dfaf49a TB |
559 | nr_written, |
560 | hash); | |
561 | } | |
562 | ||
66833f0e | 563 | rename_tmp_packfile(name_buffer, pack_tmp_name, "pack"); |
66833f0e ÆAB |
564 | if (rev_tmp_name) |
565 | rename_tmp_packfile(name_buffer, rev_tmp_name, "rev"); | |
5dfaf49a TB |
566 | if (mtimes_tmp_name) |
567 | rename_tmp_packfile(name_buffer, mtimes_tmp_name, "mtimes"); | |
0e990530 | 568 | } |
33add2ad CC |
569 | |
570 | void write_promisor_file(const char *promisor_name, struct ref **sought, int nr_sought) | |
571 | { | |
7c99bc23 | 572 | int i, err; |
33add2ad CC |
573 | FILE *output = xfopen(promisor_name, "w"); |
574 | ||
575 | for (i = 0; i < nr_sought; i++) | |
576 | fprintf(output, "%s %s\n", oid_to_hex(&sought[i]->old_oid), | |
577 | sought[i]->name); | |
7c99bc23 CC |
578 | |
579 | err = ferror(output); | |
580 | err |= fclose(output); | |
581 | if (err) | |
582 | die(_("could not write '%s' promisor file"), promisor_name); | |
33add2ad | 583 | } |