Introduce an unlink(2) wrapper which gives warning if unlink failed
[git/git.git] / http-walker.c
CommitLineData
6eb7ed54
DB
1#include "cache.h"
2#include "commit.h"
271421cd 3#include "pack.h"
30ae764b 4#include "walker.h"
29508e1e 5#include "http.h"
7baa3e86 6
49a0f240
NH
7#define PREV_BUF_SIZE 4096
8#define RANGE_HEADER_SIZE 30
9
b3661567
DB
10struct alt_base
11{
2afea3bc 12 char *base;
b3661567
DB
13 int got_indices;
14 struct packed_git *packs;
15 struct alt_base *next;
16};
17
e388ab74 18enum object_request_state {
1d389ab6
NH
19 WAITING,
20 ABORTED,
21 ACTIVE,
22 COMPLETE,
23};
6eb7ed54 24
e388ab74 25struct object_request
1d389ab6 26{
30ae764b 27 struct walker *walker;
1d389ab6
NH
28 unsigned char sha1[20];
29 struct alt_base *repo;
30 char *url;
31 char filename[PATH_MAX];
32 char tmpfile[PATH_MAX];
33 int local;
e388ab74 34 enum object_request_state state;
1d389ab6
NH
35 CURLcode curl_result;
36 char errorstr[CURL_ERROR_SIZE];
37 long http_code;
38 unsigned char real_sha1[20];
9126f009 39 git_SHA_CTX c;
1d389ab6
NH
40 z_stream stream;
41 int zret;
42 int rename;
43 struct active_request_slot *slot;
e388ab74 44 struct object_request *next;
1d389ab6
NH
45};
46
e388ab74 47struct alternates_request {
30ae764b 48 struct walker *walker;
8e29f6a0 49 const char *base;
acc075a8 50 char *url;
028c2976 51 struct strbuf *buffer;
acc075a8
NH
52 struct active_request_slot *slot;
53 int http_specific;
54};
55
30ae764b
DB
56struct walker_data {
57 const char *url;
58 int got_alternates;
59 struct alt_base *alt;
60 struct curl_slist *no_pragma_header;
61};
62
96f1e58f 63static struct object_request *object_queue_head;
bc8f2652 64
182005b9
DB
65static size_t fwrite_sha1_file(void *ptr, size_t eltsize, size_t nmemb,
66 void *data)
67{
bf0f910d 68 unsigned char expn[4096];
6eb7ed54
DB
69 size_t size = eltsize * nmemb;
70 int posn = 0;
e388ab74 71 struct object_request *obj_req = (struct object_request *)data;
6eb7ed54 72 do {
93822c22 73 ssize_t retval = xwrite(obj_req->local,
1d7f171c 74 (char *) ptr + posn, size - posn);
6eb7ed54
DB
75 if (retval < 0)
76 return posn;
77 posn += retval;
78 } while (posn < size);
79
e388ab74
NH
80 obj_req->stream.avail_in = size;
81 obj_req->stream.next_in = ptr;
6eb7ed54 82 do {
e388ab74
NH
83 obj_req->stream.next_out = expn;
84 obj_req->stream.avail_out = sizeof(expn);
39c68542 85 obj_req->zret = git_inflate(&obj_req->stream, Z_SYNC_FLUSH);
9126f009 86 git_SHA1_Update(&obj_req->c, expn,
e388ab74
NH
87 sizeof(expn) - obj_req->stream.avail_out);
88 } while (obj_req->stream.avail_in && obj_req->zret == Z_OK);
1d389ab6 89 data_received++;
6eb7ed54
DB
90 return size;
91}
92
30ae764b 93static void fetch_alternates(struct walker *walker, const char *base);
1d389ab6 94
29508e1e 95static void process_object_response(void *callback_data);
1d389ab6 96
30ae764b
DB
97static void start_object_request(struct walker *walker,
98 struct object_request *obj_req)
1d389ab6 99{
e388ab74 100 char *hex = sha1_to_hex(obj_req->sha1);
1d389ab6
NH
101 char prevfile[PATH_MAX];
102 char *url;
103 char *posn;
104 int prevlocal;
105 unsigned char prev_buf[PREV_BUF_SIZE];
106 ssize_t prev_read = 0;
107 long prev_posn = 0;
108 char range[RANGE_HEADER_SIZE];
109 struct curl_slist *range_header = NULL;
110 struct active_request_slot *slot;
30ae764b 111 struct walker_data *data = walker->data;
1d389ab6 112
e388ab74 113 snprintf(prevfile, sizeof(prevfile), "%s.prev", obj_req->filename);
1d389ab6 114 unlink(prevfile);
e388ab74
NH
115 rename(obj_req->tmpfile, prevfile);
116 unlink(obj_req->tmpfile);
1d389ab6 117
e388ab74
NH
118 if (obj_req->local != -1)
119 error("fd leakage in start: %d", obj_req->local);
120 obj_req->local = open(obj_req->tmpfile,
1d389ab6 121 O_WRONLY | O_CREAT | O_EXCL, 0666);
b721e01f
JH
122 /* This could have failed due to the "lazy directory creation";
123 * try to mkdir the last path component.
124 */
e388ab74
NH
125 if (obj_req->local < 0 && errno == ENOENT) {
126 char *dir = strrchr(obj_req->tmpfile, '/');
b721e01f
JH
127 if (dir) {
128 *dir = 0;
e388ab74 129 mkdir(obj_req->tmpfile, 0777);
b721e01f
JH
130 *dir = '/';
131 }
e388ab74 132 obj_req->local = open(obj_req->tmpfile,
b721e01f
JH
133 O_WRONLY | O_CREAT | O_EXCL, 0666);
134 }
135
e388ab74
NH
136 if (obj_req->local < 0) {
137 obj_req->state = ABORTED;
bd2afde8 138 error("Couldn't create temporary file %s for %s: %s",
e388ab74 139 obj_req->tmpfile, obj_req->filename, strerror(errno));
1d389ab6
NH
140 return;
141 }
142
e388ab74 143 memset(&obj_req->stream, 0, sizeof(obj_req->stream));
1d389ab6 144
39c68542 145 git_inflate_init(&obj_req->stream);
1d389ab6 146
9126f009 147 git_SHA1_Init(&obj_req->c);
1d389ab6 148
2afea3bc
GP
149 url = xmalloc(strlen(obj_req->repo->base) + 51);
150 obj_req->url = xmalloc(strlen(obj_req->repo->base) + 51);
e388ab74
NH
151 strcpy(url, obj_req->repo->base);
152 posn = url + strlen(obj_req->repo->base);
2afea3bc
GP
153 strcpy(posn, "/objects/");
154 posn += 9;
1d389ab6
NH
155 memcpy(posn, hex, 2);
156 posn += 2;
157 *(posn++) = '/';
158 strcpy(posn, hex + 2);
e388ab74 159 strcpy(obj_req->url, url);
1d389ab6
NH
160
161 /* If a previous temp file is present, process what was already
162 fetched. */
163 prevlocal = open(prevfile, O_RDONLY);
164 if (prevlocal != -1) {
165 do {
93d26e4c 166 prev_read = xread(prevlocal, prev_buf, PREV_BUF_SIZE);
1d389ab6
NH
167 if (prev_read>0) {
168 if (fwrite_sha1_file(prev_buf,
169 1,
170 prev_read,
e388ab74 171 obj_req) == prev_read) {
1d389ab6
NH
172 prev_posn += prev_read;
173 } else {
174 prev_read = -1;
175 }
176 }
177 } while (prev_read > 0);
178 close(prevlocal);
179 }
180 unlink(prevfile);
181
182 /* Reset inflate/SHA1 if there was an error reading the previous temp
183 file; also rewind to the beginning of the local file. */
184 if (prev_read == -1) {
e388ab74 185 memset(&obj_req->stream, 0, sizeof(obj_req->stream));
39c68542 186 git_inflate_init(&obj_req->stream);
9126f009 187 git_SHA1_Init(&obj_req->c);
1d389ab6
NH
188 if (prev_posn>0) {
189 prev_posn = 0;
b5da2467 190 lseek(obj_req->local, 0, SEEK_SET);
e388ab74 191 ftruncate(obj_req->local, 0);
1d389ab6
NH
192 }
193 }
194
195 slot = get_active_slot();
29508e1e 196 slot->callback_func = process_object_response;
e388ab74
NH
197 slot->callback_data = obj_req;
198 obj_req->slot = slot;
29508e1e 199
e388ab74 200 curl_easy_setopt(slot->curl, CURLOPT_FILE, obj_req);
1d389ab6 201 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_sha1_file);
e388ab74 202 curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, obj_req->errorstr);
1d389ab6 203 curl_easy_setopt(slot->curl, CURLOPT_URL, url);
30ae764b 204 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, data->no_pragma_header);
1d389ab6
NH
205
206 /* If we have successfully processed data from a previous fetch
207 attempt, only fetch the data we don't already have. */
208 if (prev_posn>0) {
30ae764b 209 if (walker->get_verbosely)
1d389ab6
NH
210 fprintf(stderr,
211 "Resuming fetch of object %s at byte %ld\n",
212 hex, prev_posn);
213 sprintf(range, "Range: bytes=%ld-", prev_posn);
214 range_header = curl_slist_append(range_header, range);
215 curl_easy_setopt(slot->curl,
216 CURLOPT_HTTPHEADER, range_header);
217 }
218
a7a8d378 219 /* Try to get the request started, abort the request on error */
e388ab74 220 obj_req->state = ACTIVE;
1d389ab6 221 if (!start_active_slot(slot)) {
e388ab74
NH
222 obj_req->state = ABORTED;
223 obj_req->slot = NULL;
224 close(obj_req->local); obj_req->local = -1;
225 free(obj_req->url);
226 return;
1d389ab6 227 }
1d389ab6
NH
228}
229
e388ab74 230static void finish_object_request(struct object_request *obj_req)
1d389ab6 231{
50496b21
NH
232 struct stat st;
233
e388ab74 234 close(obj_req->local); obj_req->local = -1;
1d389ab6 235
e388ab74 236 if (obj_req->http_code == 416) {
1d389ab6 237 fprintf(stderr, "Warning: requested range invalid; we may already have all the data.\n");
e388ab74
NH
238 } else if (obj_req->curl_result != CURLE_OK) {
239 if (stat(obj_req->tmpfile, &st) == 0)
50496b21 240 if (st.st_size == 0)
e388ab74 241 unlink(obj_req->tmpfile);
1d389ab6
NH
242 return;
243 }
244
39c68542 245 git_inflate_end(&obj_req->stream);
9126f009 246 git_SHA1_Final(obj_req->real_sha1, &obj_req->c);
e388ab74
NH
247 if (obj_req->zret != Z_STREAM_END) {
248 unlink(obj_req->tmpfile);
1d389ab6
NH
249 return;
250 }
a89fccd2 251 if (hashcmp(obj_req->sha1, obj_req->real_sha1)) {
e388ab74 252 unlink(obj_req->tmpfile);
1d389ab6
NH
253 return;
254 }
e388ab74
NH
255 obj_req->rename =
256 move_temp_to_file(obj_req->tmpfile, obj_req->filename);
1d389ab6 257
e388ab74 258 if (obj_req->rename == 0)
30ae764b 259 walker_say(obj_req->walker, "got %s\n", sha1_to_hex(obj_req->sha1));
1d389ab6
NH
260}
261
29508e1e
NH
262static void process_object_response(void *callback_data)
263{
e388ab74
NH
264 struct object_request *obj_req =
265 (struct object_request *)callback_data;
30ae764b
DB
266 struct walker *walker = obj_req->walker;
267 struct walker_data *data = walker->data;
268 struct alt_base *alt = data->alt;
29508e1e 269
e388ab74
NH
270 obj_req->curl_result = obj_req->slot->curl_result;
271 obj_req->http_code = obj_req->slot->http_code;
272 obj_req->slot = NULL;
273 obj_req->state = COMPLETE;
29508e1e
NH
274
275 /* Use alternates if necessary */
be4a015b 276 if (missing_target(obj_req)) {
30ae764b 277 fetch_alternates(walker, alt->base);
e388ab74
NH
278 if (obj_req->repo->next != NULL) {
279 obj_req->repo =
280 obj_req->repo->next;
281 close(obj_req->local);
282 obj_req->local = -1;
30ae764b 283 start_object_request(walker, obj_req);
29508e1e
NH
284 return;
285 }
286 }
287
e388ab74 288 finish_object_request(obj_req);
29508e1e
NH
289}
290
e388ab74 291static void release_object_request(struct object_request *obj_req)
1d389ab6 292{
e388ab74 293 struct object_request *entry = object_queue_head;
1d389ab6 294
e388ab74
NH
295 if (obj_req->local != -1)
296 error("fd leakage in release: %d", obj_req->local);
297 if (obj_req == object_queue_head) {
298 object_queue_head = obj_req->next;
1d389ab6 299 } else {
e388ab74 300 while (entry->next != NULL && entry->next != obj_req)
1d389ab6 301 entry = entry->next;
e388ab74 302 if (entry->next == obj_req)
1d389ab6
NH
303 entry->next = entry->next->next;
304 }
305
e388ab74
NH
306 free(obj_req->url);
307 free(obj_req);
1d389ab6
NH
308}
309
a7a8d378 310#ifdef USE_CURL_MULTI
30ae764b 311static int fill_active_slot(struct walker *walker)
1d389ab6 312{
45c17412 313 struct object_request *obj_req;
1d389ab6 314
45c17412 315 for (obj_req = object_queue_head; obj_req; obj_req = obj_req->next) {
e388ab74
NH
316 if (obj_req->state == WAITING) {
317 if (has_sha1_file(obj_req->sha1))
09db444f 318 obj_req->state = COMPLETE;
45c17412 319 else {
30ae764b 320 start_object_request(walker, obj_req);
45c17412
DB
321 return 1;
322 }
f1a906a3 323 }
8fcf7f9a 324 }
45c17412 325 return 0;
1d389ab6 326}
a7a8d378 327#endif
1d389ab6 328
30ae764b 329static void prefetch(struct walker *walker, unsigned char *sha1)
1d389ab6 330{
e388ab74
NH
331 struct object_request *newreq;
332 struct object_request *tail;
30ae764b 333 struct walker_data *data = walker->data;
1d389ab6
NH
334 char *filename = sha1_file_name(sha1);
335
336 newreq = xmalloc(sizeof(*newreq));
30ae764b 337 newreq->walker = walker;
e702496e 338 hashcpy(newreq->sha1, sha1);
30ae764b 339 newreq->repo = data->alt;
1d389ab6
NH
340 newreq->url = NULL;
341 newreq->local = -1;
342 newreq->state = WAITING;
343 snprintf(newreq->filename, sizeof(newreq->filename), "%s", filename);
344 snprintf(newreq->tmpfile, sizeof(newreq->tmpfile),
345 "%s.temp", filename);
e8dff6ba 346 newreq->slot = NULL;
1d389ab6
NH
347 newreq->next = NULL;
348
e388ab74
NH
349 if (object_queue_head == NULL) {
350 object_queue_head = newreq;
1d389ab6 351 } else {
e388ab74 352 tail = object_queue_head;
1d389ab6
NH
353 while (tail->next != NULL) {
354 tail = tail->next;
355 }
356 tail->next = newreq;
357 }
29508e1e 358
a7a8d378 359#ifdef USE_CURL_MULTI
29508e1e
NH
360 fill_active_slots();
361 step_active_slots();
a7a8d378 362#endif
1d389ab6
NH
363}
364
30ae764b 365static int fetch_index(struct walker *walker, struct alt_base *repo, unsigned char *sha1)
182005b9 366{
1d389ab6 367 char *hex = sha1_to_hex(sha1);
182005b9
DB
368 char *filename;
369 char *url;
49a0f240 370 char tmpfile[PATH_MAX];
49a0f240
NH
371 long prev_posn = 0;
372 char range[RANGE_HEADER_SIZE];
373 struct curl_slist *range_header = NULL;
30ae764b 374 struct walker_data *data = walker->data;
182005b9
DB
375
376 FILE *indexfile;
1d389ab6 377 struct active_request_slot *slot;
cb754fdf 378 struct slot_results results;
182005b9
DB
379
380 if (has_pack_index(sha1))
381 return 0;
382
30ae764b 383 if (walker->get_verbosely)
1d389ab6 384 fprintf(stderr, "Getting index for pack %s\n", hex);
8fcf7f9a 385
b3661567 386 url = xmalloc(strlen(repo->base) + 64);
1d389ab6 387 sprintf(url, "%s/objects/pack/pack-%s.idx", repo->base, hex);
8fcf7f9a 388
182005b9 389 filename = sha1_pack_index_name(sha1);
49a0f240
NH
390 snprintf(tmpfile, sizeof(tmpfile), "%s.temp", filename);
391 indexfile = fopen(tmpfile, "a");
182005b9
DB
392 if (!indexfile)
393 return error("Unable to open local file %s for pack index",
84ef0338 394 tmpfile);
182005b9 395
1d389ab6 396 slot = get_active_slot();
c8568e13 397 slot->results = &results;
1d389ab6
NH
398 curl_easy_setopt(slot->curl, CURLOPT_FILE, indexfile);
399 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite);
400 curl_easy_setopt(slot->curl, CURLOPT_URL, url);
30ae764b 401 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, data->no_pragma_header);
1d389ab6
NH
402 slot->local = indexfile;
403
49a0f240
NH
404 /* If there is data present from a previous transfer attempt,
405 resume where it left off */
406 prev_posn = ftell(indexfile);
407 if (prev_posn>0) {
30ae764b 408 if (walker->get_verbosely)
49a0f240
NH
409 fprintf(stderr,
410 "Resuming fetch of index for pack %s at byte %ld\n",
1d389ab6 411 hex, prev_posn);
49a0f240
NH
412 sprintf(range, "Range: bytes=%ld-", prev_posn);
413 range_header = curl_slist_append(range_header, range);
1d389ab6 414 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, range_header);
49a0f240
NH
415 }
416
1d389ab6
NH
417 if (start_active_slot(slot)) {
418 run_active_slot(slot);
c8568e13 419 if (results.curl_result != CURLE_OK) {
1d389ab6
NH
420 fclose(indexfile);
421 return error("Unable to get pack index %s\n%s", url,
422 curl_errorstr);
423 }
424 } else {
313c4714 425 fclose(indexfile);
1d389ab6 426 return error("Unable to start request");
182005b9
DB
427 }
428
429 fclose(indexfile);
49a0f240 430
b721e01f 431 return move_temp_to_file(tmpfile, filename);
182005b9
DB
432}
433
30ae764b 434static int setup_index(struct walker *walker, struct alt_base *repo, unsigned char *sha1)
182005b9
DB
435{
436 struct packed_git *new_pack;
437 if (has_pack_file(sha1))
a9486b02 438 return 0; /* don't list this as something we can get */
182005b9 439
30ae764b 440 if (fetch_index(walker, repo, sha1))
182005b9
DB
441 return -1;
442
443 new_pack = parse_pack_index(sha1);
a70c232e
JH
444 if (!new_pack)
445 return -1; /* parse_pack_index() already issued error message */
b3661567
DB
446 new_pack->next = repo->packs;
447 repo->packs = new_pack;
182005b9
DB
448 return 0;
449}
450
e388ab74 451static void process_alternates_response(void *callback_data)
b3661567 452{
e388ab74
NH
453 struct alternates_request *alt_req =
454 (struct alternates_request *)callback_data;
30ae764b
DB
455 struct walker *walker = alt_req->walker;
456 struct walker_data *cdata = walker->data;
acc075a8 457 struct active_request_slot *slot = alt_req->slot;
30ae764b 458 struct alt_base *tail = cdata->alt;
8e29f6a0 459 const char *base = alt_req->base;
bc8f2652 460 static const char null_byte = '\0';
acc075a8
NH
461 char *data;
462 int i = 0;
1d389ab6 463
acc075a8
NH
464 if (alt_req->http_specific) {
465 if (slot->curl_result != CURLE_OK ||
028c2976 466 !alt_req->buffer->len) {
acc075a8
NH
467
468 /* Try reusing the slot to get non-http alternates */
469 alt_req->http_specific = 0;
470 sprintf(alt_req->url, "%s/objects/info/alternates",
471 base);
472 curl_easy_setopt(slot->curl, CURLOPT_URL,
473 alt_req->url);
474 active_requests++;
475 slot->in_use = 1;
c9826473
NH
476 if (slot->finished != NULL)
477 (*slot->finished) = 0;
a3f583cb 478 if (!start_active_slot(slot)) {
30ae764b 479 cdata->got_alternates = -1;
29508e1e 480 slot->in_use = 0;
c9826473
NH
481 if (slot->finished != NULL)
482 (*slot->finished) = 1;
1d389ab6 483 }
a3f583cb 484 return;
b3661567 485 }
acc075a8 486 } else if (slot->curl_result != CURLE_OK) {
be4a015b 487 if (!missing_target(slot)) {
30ae764b 488 cdata->got_alternates = -1;
acc075a8
NH
489 return;
490 }
b3661567
DB
491 }
492
29508e1e 493 fwrite_buffer(&null_byte, 1, 1, alt_req->buffer);
028c2976
MH
494 alt_req->buffer->len--;
495 data = alt_req->buffer->buf;
1b0c1e67 496
028c2976 497 while (i < alt_req->buffer->len) {
b3661567 498 int posn = i;
028c2976 499 while (posn < alt_req->buffer->len && data[posn] != '\n')
b3661567
DB
500 posn++;
501 if (data[posn] == '\n') {
1b0c1e67
DB
502 int okay = 0;
503 int serverlen = 0;
504 struct alt_base *newalt;
505 char *target = NULL;
b3661567 506 if (data[i] == '/') {
5df1e0d0
JH
507 /* This counts
508 * http://git.host/pub/scm/linux.git/
509 * -----------here^
510 * so memcpy(dst, base, serverlen) will
511 * copy up to "...git.host".
512 */
513 const char *colon_ss = strstr(base,"://");
514 if (colon_ss) {
515 serverlen = (strchr(colon_ss + 3, '/')
516 - base);
517 okay = 1;
518 }
1b0c1e67 519 } else if (!memcmp(data + i, "../", 3)) {
5df1e0d0
JH
520 /* Relative URL; chop the corresponding
521 * number of subpath from base (and ../
522 * from data), and concatenate the result.
523 *
524 * The code first drops ../ from data, and
525 * then drops one ../ from data and one path
526 * from base. IOW, one extra ../ is dropped
527 * from data than path is dropped from base.
528 *
529 * This is not wrong. The alternate in
530 * http://git.host/pub/scm/linux.git/
531 * to borrow from
532 * http://git.host/pub/scm/linus.git/
533 * is ../../linus.git/objects/. You need
534 * two ../../ to borrow from your direct
535 * neighbour.
536 */
1b0c1e67
DB
537 i += 3;
538 serverlen = strlen(base);
8fcf7f9a 539 while (i + 2 < posn &&
1b0c1e67
DB
540 !memcmp(data + i, "../", 3)) {
541 do {
542 serverlen--;
543 } while (serverlen &&
544 base[serverlen - 1] != '/');
545 i += 3;
546 }
a9486b02 547 /* If the server got removed, give up. */
8fcf7f9a 548 okay = strchr(base, ':') - base + 3 <
1b0c1e67 549 serverlen;
acc075a8 550 } else if (alt_req->http_specific) {
1b0c1e67
DB
551 char *colon = strchr(data + i, ':');
552 char *slash = strchr(data + i, '/');
553 if (colon && slash && colon < data + posn &&
554 slash < data + posn && colon < slash) {
555 okay = 1;
556 }
557 }
5df1e0d0 558 /* skip "objects\n" at end */
1b0c1e67
DB
559 if (okay) {
560 target = xmalloc(serverlen + posn - i - 6);
5df1e0d0
JH
561 memcpy(target, base, serverlen);
562 memcpy(target + serverlen, data + i,
563 posn - i - 7);
564 target[serverlen + posn - i - 7] = 0;
30ae764b 565 if (walker->get_verbosely)
8fcf7f9a 566 fprintf(stderr,
b3661567
DB
567 "Also look at %s\n", target);
568 newalt = xmalloc(sizeof(*newalt));
1d389ab6 569 newalt->next = NULL;
b3661567
DB
570 newalt->base = target;
571 newalt->got_indices = 0;
572 newalt->packs = NULL;
8d9fbe57 573
1d389ab6
NH
574 while (tail->next != NULL)
575 tail = tail->next;
576 tail->next = newalt;
b3661567
DB
577 }
578 }
579 i = posn + 1;
580 }
bc8f2652 581
30ae764b 582 cdata->got_alternates = 1;
acc075a8
NH
583}
584
30ae764b 585static void fetch_alternates(struct walker *walker, const char *base)
acc075a8 586{
028c2976 587 struct strbuf buffer = STRBUF_INIT;
acc075a8 588 char *url;
acc075a8 589 struct active_request_slot *slot;
cb754fdf 590 struct alternates_request alt_req;
30ae764b 591 struct walker_data *cdata = walker->data;
acc075a8
NH
592
593 /* If another request has already started fetching alternates,
594 wait for them to arrive and return to processing this request's
595 curl message */
29508e1e 596#ifdef USE_CURL_MULTI
30ae764b 597 while (cdata->got_alternates == 0) {
29508e1e 598 step_active_slots();
acc075a8 599 }
29508e1e 600#endif
acc075a8
NH
601
602 /* Nothing to do if they've already been fetched */
30ae764b 603 if (cdata->got_alternates == 1)
acc075a8
NH
604 return;
605
606 /* Start the fetch */
30ae764b 607 cdata->got_alternates = 0;
acc075a8 608
30ae764b 609 if (walker->get_verbosely)
acc075a8 610 fprintf(stderr, "Getting alternates list for %s\n", base);
8fcf7f9a 611
acc075a8
NH
612 url = xmalloc(strlen(base) + 31);
613 sprintf(url, "%s/objects/info/http-alternates", base);
614
615 /* Use a callback to process the result, since another request
616 may fail and need to have alternates loaded before continuing */
617 slot = get_active_slot();
e388ab74 618 slot->callback_func = process_alternates_response;
30ae764b 619 alt_req.walker = walker;
acc075a8
NH
620 slot->callback_data = &alt_req;
621
622 curl_easy_setopt(slot->curl, CURLOPT_FILE, &buffer);
29508e1e 623 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
acc075a8
NH
624 curl_easy_setopt(slot->curl, CURLOPT_URL, url);
625
626 alt_req.base = base;
627 alt_req.url = url;
628 alt_req.buffer = &buffer;
629 alt_req.http_specific = 1;
630 alt_req.slot = slot;
631
632 if (start_active_slot(slot))
633 run_active_slot(slot);
634 else
30ae764b 635 cdata->got_alternates = -1;
acc075a8 636
028c2976 637 strbuf_release(&buffer);
acc075a8 638 free(url);
b3661567
DB
639}
640
30ae764b 641static int fetch_indices(struct walker *walker, struct alt_base *repo)
182005b9
DB
642{
643 unsigned char sha1[20];
644 char *url;
028c2976 645 struct strbuf buffer = STRBUF_INIT;
182005b9
DB
646 char *data;
647 int i = 0;
3a462bc9 648 int ret = 0;
182005b9 649
1d389ab6 650 struct active_request_slot *slot;
cb754fdf 651 struct slot_results results;
1d389ab6 652
b3661567 653 if (repo->got_indices)
182005b9
DB
654 return 0;
655
30ae764b 656 if (walker->get_verbosely)
6fd72e39 657 fprintf(stderr, "Getting pack list for %s\n", repo->base);
8fcf7f9a 658
b3661567
DB
659 url = xmalloc(strlen(repo->base) + 21);
660 sprintf(url, "%s/objects/info/packs", repo->base);
182005b9 661
1d389ab6 662 slot = get_active_slot();
c8568e13 663 slot->results = &results;
1d389ab6 664 curl_easy_setopt(slot->curl, CURLOPT_FILE, &buffer);
29508e1e 665 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
1d389ab6
NH
666 curl_easy_setopt(slot->curl, CURLOPT_URL, url);
667 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, NULL);
668 if (start_active_slot(slot)) {
669 run_active_slot(slot);
c8568e13 670 if (results.curl_result != CURLE_OK) {
be4a015b 671 if (missing_target(&results)) {
5e3a7691 672 repo->got_indices = 1;
3a462bc9 673 goto cleanup;
5e3a7691
NH
674 } else {
675 repo->got_indices = 0;
3a462bc9
MH
676 ret = error("%s", curl_errorstr);
677 goto cleanup;
5e3a7691 678 }
bc8f2652 679 }
1d389ab6 680 } else {
5e3a7691 681 repo->got_indices = 0;
3a462bc9
MH
682 ret = error("Unable to start request");
683 goto cleanup;
1d389ab6 684 }
182005b9 685
028c2976
MH
686 data = buffer.buf;
687 while (i < buffer.len) {
182005b9
DB
688 switch (data[i]) {
689 case 'P':
690 i++;
028c2976 691 if (i + 52 <= buffer.len &&
cc44c765 692 !prefixcmp(data + i, " pack-") &&
1968d77d 693 !prefixcmp(data + i + 46, ".pack\n")) {
182005b9 694 get_sha1_hex(data + i + 6, sha1);
30ae764b 695 setup_index(walker, repo, sha1);
182005b9
DB
696 i += 51;
697 break;
698 }
699 default:
028c2976 700 while (i < buffer.len && data[i] != '\n')
182005b9
DB
701 i++;
702 }
703 i++;
b3661567 704 }
182005b9 705
b3661567 706 repo->got_indices = 1;
3a462bc9
MH
707cleanup:
708 strbuf_release(&buffer);
709 free(url);
710 return ret;
182005b9
DB
711}
712
30ae764b 713static int fetch_pack(struct walker *walker, struct alt_base *repo, unsigned char *sha1)
182005b9
DB
714{
715 char *url;
716 struct packed_git *target;
717 struct packed_git **lst;
718 FILE *packfile;
719 char *filename;
49a0f240
NH
720 char tmpfile[PATH_MAX];
721 int ret;
722 long prev_posn = 0;
723 char range[RANGE_HEADER_SIZE];
724 struct curl_slist *range_header = NULL;
30ae764b 725 struct walker_data *data = walker->data;
1d389ab6
NH
726
727 struct active_request_slot *slot;
cb754fdf 728 struct slot_results results;
182005b9 729
30ae764b 730 if (fetch_indices(walker, repo))
182005b9 731 return -1;
b3661567 732 target = find_sha1_pack(sha1, repo->packs);
182005b9 733 if (!target)
b3661567 734 return -1;
182005b9 735
30ae764b 736 if (walker->get_verbosely) {
182005b9
DB
737 fprintf(stderr, "Getting pack %s\n",
738 sha1_to_hex(target->sha1));
739 fprintf(stderr, " which contains %s\n",
740 sha1_to_hex(sha1));
741 }
742
b3661567 743 url = xmalloc(strlen(repo->base) + 65);
182005b9 744 sprintf(url, "%s/objects/pack/pack-%s.pack",
b3661567 745 repo->base, sha1_to_hex(target->sha1));
182005b9
DB
746
747 filename = sha1_pack_name(target->sha1);
49a0f240
NH
748 snprintf(tmpfile, sizeof(tmpfile), "%s.temp", filename);
749 packfile = fopen(tmpfile, "a");
182005b9
DB
750 if (!packfile)
751 return error("Unable to open local file %s for pack",
84ef0338 752 tmpfile);
182005b9 753
1d389ab6 754 slot = get_active_slot();
c8568e13 755 slot->results = &results;
1d389ab6
NH
756 curl_easy_setopt(slot->curl, CURLOPT_FILE, packfile);
757 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite);
758 curl_easy_setopt(slot->curl, CURLOPT_URL, url);
30ae764b 759 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, data->no_pragma_header);
1d389ab6 760 slot->local = packfile;
1ddea77e 761
49a0f240
NH
762 /* If there is data present from a previous transfer attempt,
763 resume where it left off */
764 prev_posn = ftell(packfile);
765 if (prev_posn>0) {
30ae764b 766 if (walker->get_verbosely)
49a0f240
NH
767 fprintf(stderr,
768 "Resuming fetch of pack %s at byte %ld\n",
769 sha1_to_hex(target->sha1), prev_posn);
770 sprintf(range, "Range: bytes=%ld-", prev_posn);
771 range_header = curl_slist_append(range_header, range);
1d389ab6 772 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, range_header);
49a0f240
NH
773 }
774
1d389ab6
NH
775 if (start_active_slot(slot)) {
776 run_active_slot(slot);
c8568e13 777 if (results.curl_result != CURLE_OK) {
1d389ab6
NH
778 fclose(packfile);
779 return error("Unable to get pack file %s\n%s", url,
780 curl_errorstr);
781 }
782 } else {
313c4714 783 fclose(packfile);
1d389ab6 784 return error("Unable to start request");
182005b9
DB
785 }
786
1c23d794 787 target->pack_size = ftell(packfile);
182005b9
DB
788 fclose(packfile);
789
b721e01f 790 ret = move_temp_to_file(tmpfile, filename);
49a0f240 791 if (ret)
b721e01f 792 return ret;
49a0f240 793
b3661567 794 lst = &repo->packs;
182005b9
DB
795 while (*lst != target)
796 lst = &((*lst)->next);
797 *lst = (*lst)->next;
798
77d3ecee 799 if (verify_pack(target))
271421cd 800 return -1;
182005b9
DB
801 install_packed_git(target);
802
803 return 0;
804}
805
53f31389
MW
806static void abort_object_request(struct object_request *obj_req)
807{
808 if (obj_req->local >= 0) {
809 close(obj_req->local);
810 obj_req->local = -1;
811 }
812 unlink(obj_req->tmpfile);
813 if (obj_req->slot) {
a6080a0a 814 release_active_slot(obj_req->slot);
53f31389
MW
815 obj_req->slot = NULL;
816 }
817 release_object_request(obj_req);
818}
819
30ae764b 820static int fetch_object(struct walker *walker, struct alt_base *repo, unsigned char *sha1)
6eb7ed54
DB
821{
822 char *hex = sha1_to_hex(sha1);
29508e1e 823 int ret = 0;
e388ab74 824 struct object_request *obj_req = object_queue_head;
1d389ab6 825
a89fccd2 826 while (obj_req != NULL && hashcmp(obj_req->sha1, sha1))
e388ab74
NH
827 obj_req = obj_req->next;
828 if (obj_req == NULL)
1d389ab6
NH
829 return error("Couldn't find request for %s in the queue", hex);
830
e388ab74 831 if (has_sha1_file(obj_req->sha1)) {
53f31389 832 abort_object_request(obj_req);
11f0dafe
NH
833 return 0;
834 }
835
a7a8d378 836#ifdef USE_CURL_MULTI
e388ab74 837 while (obj_req->state == WAITING) {
29508e1e 838 step_active_slots();
1d389ab6 839 }
a7a8d378 840#else
30ae764b 841 start_object_request(walker, obj_req);
a7a8d378 842#endif
6eb7ed54 843
e388ab74
NH
844 while (obj_req->state == ACTIVE) {
845 run_active_slot(obj_req->slot);
a7a8d378 846 }
e388ab74
NH
847 if (obj_req->local != -1) {
848 close(obj_req->local); obj_req->local = -1;
313c4714 849 }
6eb7ed54 850
e388ab74 851 if (obj_req->state == ABORTED) {
29508e1e 852 ret = error("Request for %s aborted", hex);
e388ab74
NH
853 } else if (obj_req->curl_result != CURLE_OK &&
854 obj_req->http_code != 416) {
be4a015b 855 if (missing_target(obj_req))
e2029eb9
PB
856 ret = -1; /* Be silent, it is probably in a pack. */
857 else
858 ret = error("%s (curl_result = %d, http_code = %ld, sha1 = %s)",
e388ab74
NH
859 obj_req->errorstr, obj_req->curl_result,
860 obj_req->http_code, hex);
861 } else if (obj_req->zret != Z_STREAM_END) {
30ae764b 862 walker->corrupt_object_found++;
bd2afde8 863 ret = error("File %s (%s) corrupt", hex, obj_req->url);
a89fccd2 864 } else if (hashcmp(obj_req->sha1, obj_req->real_sha1)) {
bd2afde8 865 ret = error("File %s has bad hash", hex);
e388ab74 866 } else if (obj_req->rename < 0) {
7b934ec0
MW
867 ret = error("unable to write sha1 filename %s",
868 obj_req->filename);
6eb7ed54 869 }
49a0f240 870
e388ab74 871 release_object_request(obj_req);
29508e1e 872 return ret;
6eb7ed54
DB
873}
874
30ae764b 875static int fetch(struct walker *walker, unsigned char *sha1)
b3661567 876{
30ae764b
DB
877 struct walker_data *data = walker->data;
878 struct alt_base *altbase = data->alt;
1d389ab6 879
30ae764b 880 if (!fetch_object(walker, altbase, sha1))
1d389ab6 881 return 0;
b3661567 882 while (altbase) {
30ae764b 883 if (!fetch_pack(walker, altbase, sha1))
b3661567 884 return 0;
30ae764b 885 fetch_alternates(walker, data->alt->base);
b3661567
DB
886 altbase = altbase->next;
887 }
bd2afde8 888 return error("Unable to find %s under %s", sha1_to_hex(sha1),
30ae764b 889 data->alt->base);
b3661567
DB
890}
891
c13b2633 892static int fetch_ref(struct walker *walker, struct ref *ref)
cd541a68 893{
30ae764b 894 struct walker_data *data = walker->data;
c13b2633 895 return http_fetch_ref(data->alt->base, ref);
cd541a68
DB
896}
897
30ae764b
DB
898static void cleanup(struct walker *walker)
899{
900 struct walker_data *data = walker->data;
901 http_cleanup();
902
903 curl_slist_free_all(data->no_pragma_header);
904}
905
9fc6440d 906struct walker *get_http_walker(const char *url, struct remote *remote)
6eb7ed54 907{
9c880b3e 908 char *s;
30ae764b
DB
909 struct walker_data *data = xmalloc(sizeof(struct walker_data));
910 struct walker *walker = xmalloc(sizeof(struct walker));
6eb7ed54 911
9fc6440d 912 http_init(remote);
d402d556 913
30ae764b 914 data->no_pragma_header = curl_slist_append(NULL, "Pragma:");
3dcb90f5 915
30ae764b
DB
916 data->alt = xmalloc(sizeof(*data->alt));
917 data->alt->base = xmalloc(strlen(url) + 1);
918 strcpy(data->alt->base, url);
919 for (s = data->alt->base + strlen(data->alt->base) - 1; *s == '/'; --s)
9c880b3e 920 *s = 0;
6eb7ed54 921
30ae764b
DB
922 data->alt->got_indices = 0;
923 data->alt->packs = NULL;
924 data->alt->next = NULL;
925 data->got_alternates = -1;
fc57b6aa 926
30ae764b
DB
927 walker->corrupt_object_found = 0;
928 walker->fetch = fetch;
929 walker->fetch_ref = fetch_ref;
930 walker->prefetch = prefetch;
931 walker->cleanup = cleanup;
932 walker->data = data;
6eb7ed54 933
30ae764b
DB
934#ifdef USE_CURL_MULTI
935 add_fill_function(walker, (int (*)(void *)) fill_active_slot);
936#endif
8e29f6a0 937
30ae764b 938 return walker;
6eb7ed54 939}