move show_pack_info() where it belongs
[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];
39 SHA_CTX c;
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);
85 obj_req->zret = inflate(&obj_req->stream, Z_SYNC_FLUSH);
86 SHA1_Update(&obj_req->c, expn,
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
e388ab74 145 inflateInit(&obj_req->stream);
1d389ab6 146
e388ab74 147 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
NH
185 memset(&obj_req->stream, 0, sizeof(obj_req->stream));
186 inflateInit(&obj_req->stream);
187 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
NH
234 fchmod(obj_req->local, 0444);
235 close(obj_req->local); obj_req->local = -1;
1d389ab6 236
e388ab74 237 if (obj_req->http_code == 416) {
1d389ab6 238 fprintf(stderr, "Warning: requested range invalid; we may already have all the data.\n");
e388ab74
NH
239 } else if (obj_req->curl_result != CURLE_OK) {
240 if (stat(obj_req->tmpfile, &st) == 0)
50496b21 241 if (st.st_size == 0)
e388ab74 242 unlink(obj_req->tmpfile);
1d389ab6
NH
243 return;
244 }
245
e388ab74
NH
246 inflateEnd(&obj_req->stream);
247 SHA1_Final(obj_req->real_sha1, &obj_req->c);
248 if (obj_req->zret != Z_STREAM_END) {
249 unlink(obj_req->tmpfile);
1d389ab6
NH
250 return;
251 }
a89fccd2 252 if (hashcmp(obj_req->sha1, obj_req->real_sha1)) {
e388ab74 253 unlink(obj_req->tmpfile);
1d389ab6
NH
254 return;
255 }
e388ab74
NH
256 obj_req->rename =
257 move_temp_to_file(obj_req->tmpfile, obj_req->filename);
1d389ab6 258
e388ab74 259 if (obj_req->rename == 0)
30ae764b 260 walker_say(obj_req->walker, "got %s\n", sha1_to_hex(obj_req->sha1));
1d389ab6
NH
261}
262
29508e1e
NH
263static void process_object_response(void *callback_data)
264{
e388ab74
NH
265 struct object_request *obj_req =
266 (struct object_request *)callback_data;
30ae764b
DB
267 struct walker *walker = obj_req->walker;
268 struct walker_data *data = walker->data;
269 struct alt_base *alt = data->alt;
29508e1e 270
e388ab74
NH
271 obj_req->curl_result = obj_req->slot->curl_result;
272 obj_req->http_code = obj_req->slot->http_code;
273 obj_req->slot = NULL;
274 obj_req->state = COMPLETE;
29508e1e
NH
275
276 /* Use alternates if necessary */
be4a015b 277 if (missing_target(obj_req)) {
30ae764b 278 fetch_alternates(walker, alt->base);
e388ab74
NH
279 if (obj_req->repo->next != NULL) {
280 obj_req->repo =
281 obj_req->repo->next;
282 close(obj_req->local);
283 obj_req->local = -1;
30ae764b 284 start_object_request(walker, obj_req);
29508e1e
NH
285 return;
286 }
287 }
288
e388ab74 289 finish_object_request(obj_req);
29508e1e
NH
290}
291
e388ab74 292static void release_object_request(struct object_request *obj_req)
1d389ab6 293{
e388ab74 294 struct object_request *entry = object_queue_head;
1d389ab6 295
e388ab74
NH
296 if (obj_req->local != -1)
297 error("fd leakage in release: %d", obj_req->local);
298 if (obj_req == object_queue_head) {
299 object_queue_head = obj_req->next;
1d389ab6 300 } else {
e388ab74 301 while (entry->next != NULL && entry->next != obj_req)
1d389ab6 302 entry = entry->next;
e388ab74 303 if (entry->next == obj_req)
1d389ab6
NH
304 entry->next = entry->next->next;
305 }
306
e388ab74
NH
307 free(obj_req->url);
308 free(obj_req);
1d389ab6
NH
309}
310
a7a8d378 311#ifdef USE_CURL_MULTI
30ae764b 312static int fill_active_slot(struct walker *walker)
1d389ab6 313{
45c17412 314 struct object_request *obj_req;
1d389ab6 315
45c17412 316 for (obj_req = object_queue_head; obj_req; obj_req = obj_req->next) {
e388ab74
NH
317 if (obj_req->state == WAITING) {
318 if (has_sha1_file(obj_req->sha1))
09db444f 319 obj_req->state = COMPLETE;
45c17412 320 else {
30ae764b 321 start_object_request(walker, obj_req);
45c17412
DB
322 return 1;
323 }
f1a906a3 324 }
8fcf7f9a 325 }
45c17412 326 return 0;
1d389ab6 327}
a7a8d378 328#endif
1d389ab6 329
30ae764b 330static void prefetch(struct walker *walker, unsigned char *sha1)
1d389ab6 331{
e388ab74
NH
332 struct object_request *newreq;
333 struct object_request *tail;
30ae764b 334 struct walker_data *data = walker->data;
1d389ab6
NH
335 char *filename = sha1_file_name(sha1);
336
337 newreq = xmalloc(sizeof(*newreq));
30ae764b 338 newreq->walker = walker;
e702496e 339 hashcpy(newreq->sha1, sha1);
30ae764b 340 newreq->repo = data->alt;
1d389ab6
NH
341 newreq->url = NULL;
342 newreq->local = -1;
343 newreq->state = WAITING;
344 snprintf(newreq->filename, sizeof(newreq->filename), "%s", filename);
345 snprintf(newreq->tmpfile, sizeof(newreq->tmpfile),
346 "%s.temp", filename);
e8dff6ba 347 newreq->slot = NULL;
1d389ab6
NH
348 newreq->next = NULL;
349
e388ab74
NH
350 if (object_queue_head == NULL) {
351 object_queue_head = newreq;
1d389ab6 352 } else {
e388ab74 353 tail = object_queue_head;
1d389ab6
NH
354 while (tail->next != NULL) {
355 tail = tail->next;
356 }
357 tail->next = newreq;
358 }
29508e1e 359
a7a8d378 360#ifdef USE_CURL_MULTI
29508e1e
NH
361 fill_active_slots();
362 step_active_slots();
a7a8d378 363#endif
1d389ab6
NH
364}
365
30ae764b 366static int fetch_index(struct walker *walker, struct alt_base *repo, unsigned char *sha1)
182005b9 367{
1d389ab6 368 char *hex = sha1_to_hex(sha1);
182005b9
DB
369 char *filename;
370 char *url;
49a0f240 371 char tmpfile[PATH_MAX];
49a0f240
NH
372 long prev_posn = 0;
373 char range[RANGE_HEADER_SIZE];
374 struct curl_slist *range_header = NULL;
30ae764b 375 struct walker_data *data = walker->data;
182005b9
DB
376
377 FILE *indexfile;
1d389ab6 378 struct active_request_slot *slot;
cb754fdf 379 struct slot_results results;
182005b9
DB
380
381 if (has_pack_index(sha1))
382 return 0;
383
30ae764b 384 if (walker->get_verbosely)
1d389ab6 385 fprintf(stderr, "Getting index for pack %s\n", hex);
8fcf7f9a 386
b3661567 387 url = xmalloc(strlen(repo->base) + 64);
1d389ab6 388 sprintf(url, "%s/objects/pack/pack-%s.idx", repo->base, hex);
8fcf7f9a 389
182005b9 390 filename = sha1_pack_index_name(sha1);
49a0f240
NH
391 snprintf(tmpfile, sizeof(tmpfile), "%s.temp", filename);
392 indexfile = fopen(tmpfile, "a");
182005b9
DB
393 if (!indexfile)
394 return error("Unable to open local file %s for pack index",
84ef0338 395 tmpfile);
182005b9 396
1d389ab6 397 slot = get_active_slot();
c8568e13 398 slot->results = &results;
1d389ab6
NH
399 curl_easy_setopt(slot->curl, CURLOPT_FILE, indexfile);
400 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite);
401 curl_easy_setopt(slot->curl, CURLOPT_URL, url);
30ae764b 402 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, data->no_pragma_header);
1d389ab6
NH
403 slot->local = indexfile;
404
49a0f240
NH
405 /* If there is data present from a previous transfer attempt,
406 resume where it left off */
407 prev_posn = ftell(indexfile);
408 if (prev_posn>0) {
30ae764b 409 if (walker->get_verbosely)
49a0f240
NH
410 fprintf(stderr,
411 "Resuming fetch of index for pack %s at byte %ld\n",
1d389ab6 412 hex, prev_posn);
49a0f240
NH
413 sprintf(range, "Range: bytes=%ld-", prev_posn);
414 range_header = curl_slist_append(range_header, range);
1d389ab6 415 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, range_header);
49a0f240
NH
416 }
417
1d389ab6
NH
418 if (start_active_slot(slot)) {
419 run_active_slot(slot);
c8568e13 420 if (results.curl_result != CURLE_OK) {
1d389ab6
NH
421 fclose(indexfile);
422 return error("Unable to get pack index %s\n%s", url,
423 curl_errorstr);
424 }
425 } else {
313c4714 426 fclose(indexfile);
1d389ab6 427 return error("Unable to start request");
182005b9
DB
428 }
429
430 fclose(indexfile);
49a0f240 431
b721e01f 432 return move_temp_to_file(tmpfile, filename);
182005b9
DB
433}
434
30ae764b 435static int setup_index(struct walker *walker, struct alt_base *repo, unsigned char *sha1)
182005b9
DB
436{
437 struct packed_git *new_pack;
438 if (has_pack_file(sha1))
a9486b02 439 return 0; /* don't list this as something we can get */
182005b9 440
30ae764b 441 if (fetch_index(walker, repo, sha1))
182005b9
DB
442 return -1;
443
444 new_pack = parse_pack_index(sha1);
b3661567
DB
445 new_pack->next = repo->packs;
446 repo->packs = new_pack;
182005b9
DB
447 return 0;
448}
449
e388ab74 450static void process_alternates_response(void *callback_data)
b3661567 451{
e388ab74
NH
452 struct alternates_request *alt_req =
453 (struct alternates_request *)callback_data;
30ae764b
DB
454 struct walker *walker = alt_req->walker;
455 struct walker_data *cdata = walker->data;
acc075a8 456 struct active_request_slot *slot = alt_req->slot;
30ae764b 457 struct alt_base *tail = cdata->alt;
8e29f6a0 458 const char *base = alt_req->base;
bc8f2652 459 static const char null_byte = '\0';
acc075a8
NH
460 char *data;
461 int i = 0;
1d389ab6 462
acc075a8
NH
463 if (alt_req->http_specific) {
464 if (slot->curl_result != CURLE_OK ||
028c2976 465 !alt_req->buffer->len) {
acc075a8
NH
466
467 /* Try reusing the slot to get non-http alternates */
468 alt_req->http_specific = 0;
469 sprintf(alt_req->url, "%s/objects/info/alternates",
470 base);
471 curl_easy_setopt(slot->curl, CURLOPT_URL,
472 alt_req->url);
473 active_requests++;
474 slot->in_use = 1;
c9826473
NH
475 if (slot->finished != NULL)
476 (*slot->finished) = 0;
a3f583cb 477 if (!start_active_slot(slot)) {
30ae764b 478 cdata->got_alternates = -1;
29508e1e 479 slot->in_use = 0;
c9826473
NH
480 if (slot->finished != NULL)
481 (*slot->finished) = 1;
1d389ab6 482 }
a3f583cb 483 return;
b3661567 484 }
acc075a8 485 } else if (slot->curl_result != CURLE_OK) {
be4a015b 486 if (!missing_target(slot)) {
30ae764b 487 cdata->got_alternates = -1;
acc075a8
NH
488 return;
489 }
b3661567
DB
490 }
491
29508e1e 492 fwrite_buffer(&null_byte, 1, 1, alt_req->buffer);
028c2976
MH
493 alt_req->buffer->len--;
494 data = alt_req->buffer->buf;
1b0c1e67 495
028c2976 496 while (i < alt_req->buffer->len) {
b3661567 497 int posn = i;
028c2976 498 while (posn < alt_req->buffer->len && data[posn] != '\n')
b3661567
DB
499 posn++;
500 if (data[posn] == '\n') {
1b0c1e67
DB
501 int okay = 0;
502 int serverlen = 0;
503 struct alt_base *newalt;
504 char *target = NULL;
b3661567 505 if (data[i] == '/') {
5df1e0d0
JH
506 /* This counts
507 * http://git.host/pub/scm/linux.git/
508 * -----------here^
509 * so memcpy(dst, base, serverlen) will
510 * copy up to "...git.host".
511 */
512 const char *colon_ss = strstr(base,"://");
513 if (colon_ss) {
514 serverlen = (strchr(colon_ss + 3, '/')
515 - base);
516 okay = 1;
517 }
1b0c1e67 518 } else if (!memcmp(data + i, "../", 3)) {
5df1e0d0
JH
519 /* Relative URL; chop the corresponding
520 * number of subpath from base (and ../
521 * from data), and concatenate the result.
522 *
523 * The code first drops ../ from data, and
524 * then drops one ../ from data and one path
525 * from base. IOW, one extra ../ is dropped
526 * from data than path is dropped from base.
527 *
528 * This is not wrong. The alternate in
529 * http://git.host/pub/scm/linux.git/
530 * to borrow from
531 * http://git.host/pub/scm/linus.git/
532 * is ../../linus.git/objects/. You need
533 * two ../../ to borrow from your direct
534 * neighbour.
535 */
1b0c1e67
DB
536 i += 3;
537 serverlen = strlen(base);
8fcf7f9a 538 while (i + 2 < posn &&
1b0c1e67
DB
539 !memcmp(data + i, "../", 3)) {
540 do {
541 serverlen--;
542 } while (serverlen &&
543 base[serverlen - 1] != '/');
544 i += 3;
545 }
a9486b02 546 /* If the server got removed, give up. */
8fcf7f9a 547 okay = strchr(base, ':') - base + 3 <
1b0c1e67 548 serverlen;
acc075a8 549 } else if (alt_req->http_specific) {
1b0c1e67
DB
550 char *colon = strchr(data + i, ':');
551 char *slash = strchr(data + i, '/');
552 if (colon && slash && colon < data + posn &&
553 slash < data + posn && colon < slash) {
554 okay = 1;
555 }
556 }
5df1e0d0 557 /* skip "objects\n" at end */
1b0c1e67
DB
558 if (okay) {
559 target = xmalloc(serverlen + posn - i - 6);
5df1e0d0
JH
560 memcpy(target, base, serverlen);
561 memcpy(target + serverlen, data + i,
562 posn - i - 7);
563 target[serverlen + posn - i - 7] = 0;
30ae764b 564 if (walker->get_verbosely)
8fcf7f9a 565 fprintf(stderr,
b3661567
DB
566 "Also look at %s\n", target);
567 newalt = xmalloc(sizeof(*newalt));
1d389ab6 568 newalt->next = NULL;
b3661567
DB
569 newalt->base = target;
570 newalt->got_indices = 0;
571 newalt->packs = NULL;
8d9fbe57 572
1d389ab6
NH
573 while (tail->next != NULL)
574 tail = tail->next;
575 tail->next = newalt;
b3661567
DB
576 }
577 }
578 i = posn + 1;
579 }
bc8f2652 580
30ae764b 581 cdata->got_alternates = 1;
acc075a8
NH
582}
583
30ae764b 584static void fetch_alternates(struct walker *walker, const char *base)
acc075a8 585{
028c2976 586 struct strbuf buffer = STRBUF_INIT;
acc075a8 587 char *url;
acc075a8 588 struct active_request_slot *slot;
cb754fdf 589 struct alternates_request alt_req;
30ae764b 590 struct walker_data *cdata = walker->data;
acc075a8
NH
591
592 /* If another request has already started fetching alternates,
593 wait for them to arrive and return to processing this request's
594 curl message */
29508e1e 595#ifdef USE_CURL_MULTI
30ae764b 596 while (cdata->got_alternates == 0) {
29508e1e 597 step_active_slots();
acc075a8 598 }
29508e1e 599#endif
acc075a8
NH
600
601 /* Nothing to do if they've already been fetched */
30ae764b 602 if (cdata->got_alternates == 1)
acc075a8
NH
603 return;
604
605 /* Start the fetch */
30ae764b 606 cdata->got_alternates = 0;
acc075a8 607
30ae764b 608 if (walker->get_verbosely)
acc075a8 609 fprintf(stderr, "Getting alternates list for %s\n", base);
8fcf7f9a 610
acc075a8
NH
611 url = xmalloc(strlen(base) + 31);
612 sprintf(url, "%s/objects/info/http-alternates", base);
613
614 /* Use a callback to process the result, since another request
615 may fail and need to have alternates loaded before continuing */
616 slot = get_active_slot();
e388ab74 617 slot->callback_func = process_alternates_response;
30ae764b 618 alt_req.walker = walker;
acc075a8
NH
619 slot->callback_data = &alt_req;
620
621 curl_easy_setopt(slot->curl, CURLOPT_FILE, &buffer);
29508e1e 622 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
acc075a8
NH
623 curl_easy_setopt(slot->curl, CURLOPT_URL, url);
624
625 alt_req.base = base;
626 alt_req.url = url;
627 alt_req.buffer = &buffer;
628 alt_req.http_specific = 1;
629 alt_req.slot = slot;
630
631 if (start_active_slot(slot))
632 run_active_slot(slot);
633 else
30ae764b 634 cdata->got_alternates = -1;
acc075a8 635
028c2976 636 strbuf_release(&buffer);
acc075a8 637 free(url);
b3661567
DB
638}
639
30ae764b 640static int fetch_indices(struct walker *walker, struct alt_base *repo)
182005b9
DB
641{
642 unsigned char sha1[20];
643 char *url;
028c2976 644 struct strbuf buffer = STRBUF_INIT;
182005b9
DB
645 char *data;
646 int i = 0;
3a462bc9 647 int ret = 0;
182005b9 648
1d389ab6 649 struct active_request_slot *slot;
cb754fdf 650 struct slot_results results;
1d389ab6 651
b3661567 652 if (repo->got_indices)
182005b9
DB
653 return 0;
654
30ae764b 655 if (walker->get_verbosely)
6fd72e39 656 fprintf(stderr, "Getting pack list for %s\n", repo->base);
8fcf7f9a 657
b3661567
DB
658 url = xmalloc(strlen(repo->base) + 21);
659 sprintf(url, "%s/objects/info/packs", repo->base);
182005b9 660
1d389ab6 661 slot = get_active_slot();
c8568e13 662 slot->results = &results;
1d389ab6 663 curl_easy_setopt(slot->curl, CURLOPT_FILE, &buffer);
29508e1e 664 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
1d389ab6
NH
665 curl_easy_setopt(slot->curl, CURLOPT_URL, url);
666 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, NULL);
667 if (start_active_slot(slot)) {
668 run_active_slot(slot);
c8568e13 669 if (results.curl_result != CURLE_OK) {
be4a015b 670 if (missing_target(&results)) {
5e3a7691 671 repo->got_indices = 1;
3a462bc9 672 goto cleanup;
5e3a7691
NH
673 } else {
674 repo->got_indices = 0;
3a462bc9
MH
675 ret = error("%s", curl_errorstr);
676 goto cleanup;
5e3a7691 677 }
bc8f2652 678 }
1d389ab6 679 } else {
5e3a7691 680 repo->got_indices = 0;
3a462bc9
MH
681 ret = error("Unable to start request");
682 goto cleanup;
1d389ab6 683 }
182005b9 684
028c2976
MH
685 data = buffer.buf;
686 while (i < buffer.len) {
182005b9
DB
687 switch (data[i]) {
688 case 'P':
689 i++;
028c2976 690 if (i + 52 <= buffer.len &&
cc44c765 691 !prefixcmp(data + i, " pack-") &&
1968d77d 692 !prefixcmp(data + i + 46, ".pack\n")) {
182005b9 693 get_sha1_hex(data + i + 6, sha1);
30ae764b 694 setup_index(walker, repo, sha1);
182005b9
DB
695 i += 51;
696 break;
697 }
698 default:
028c2976 699 while (i < buffer.len && data[i] != '\n')
182005b9
DB
700 i++;
701 }
702 i++;
b3661567 703 }
182005b9 704
b3661567 705 repo->got_indices = 1;
3a462bc9
MH
706cleanup:
707 strbuf_release(&buffer);
708 free(url);
709 return ret;
182005b9
DB
710}
711
30ae764b 712static int fetch_pack(struct walker *walker, struct alt_base *repo, unsigned char *sha1)
182005b9
DB
713{
714 char *url;
715 struct packed_git *target;
716 struct packed_git **lst;
717 FILE *packfile;
718 char *filename;
49a0f240
NH
719 char tmpfile[PATH_MAX];
720 int ret;
721 long prev_posn = 0;
722 char range[RANGE_HEADER_SIZE];
723 struct curl_slist *range_header = NULL;
30ae764b 724 struct walker_data *data = walker->data;
1d389ab6
NH
725
726 struct active_request_slot *slot;
cb754fdf 727 struct slot_results results;
182005b9 728
30ae764b 729 if (fetch_indices(walker, repo))
182005b9 730 return -1;
b3661567 731 target = find_sha1_pack(sha1, repo->packs);
182005b9 732 if (!target)
b3661567 733 return -1;
182005b9 734
30ae764b 735 if (walker->get_verbosely) {
182005b9
DB
736 fprintf(stderr, "Getting pack %s\n",
737 sha1_to_hex(target->sha1));
738 fprintf(stderr, " which contains %s\n",
739 sha1_to_hex(sha1));
740 }
741
b3661567 742 url = xmalloc(strlen(repo->base) + 65);
182005b9 743 sprintf(url, "%s/objects/pack/pack-%s.pack",
b3661567 744 repo->base, sha1_to_hex(target->sha1));
182005b9
DB
745
746 filename = sha1_pack_name(target->sha1);
49a0f240
NH
747 snprintf(tmpfile, sizeof(tmpfile), "%s.temp", filename);
748 packfile = fopen(tmpfile, "a");
182005b9
DB
749 if (!packfile)
750 return error("Unable to open local file %s for pack",
84ef0338 751 tmpfile);
182005b9 752
1d389ab6 753 slot = get_active_slot();
c8568e13 754 slot->results = &results;
1d389ab6
NH
755 curl_easy_setopt(slot->curl, CURLOPT_FILE, packfile);
756 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite);
757 curl_easy_setopt(slot->curl, CURLOPT_URL, url);
30ae764b 758 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, data->no_pragma_header);
1d389ab6 759 slot->local = packfile;
1ddea77e 760
49a0f240
NH
761 /* If there is data present from a previous transfer attempt,
762 resume where it left off */
763 prev_posn = ftell(packfile);
764 if (prev_posn>0) {
30ae764b 765 if (walker->get_verbosely)
49a0f240
NH
766 fprintf(stderr,
767 "Resuming fetch of pack %s at byte %ld\n",
768 sha1_to_hex(target->sha1), prev_posn);
769 sprintf(range, "Range: bytes=%ld-", prev_posn);
770 range_header = curl_slist_append(range_header, range);
1d389ab6 771 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, range_header);
49a0f240
NH
772 }
773
1d389ab6
NH
774 if (start_active_slot(slot)) {
775 run_active_slot(slot);
c8568e13 776 if (results.curl_result != CURLE_OK) {
1d389ab6
NH
777 fclose(packfile);
778 return error("Unable to get pack file %s\n%s", url,
779 curl_errorstr);
780 }
781 } else {
313c4714 782 fclose(packfile);
1d389ab6 783 return error("Unable to start request");
182005b9
DB
784 }
785
1c23d794 786 target->pack_size = ftell(packfile);
182005b9
DB
787 fclose(packfile);
788
b721e01f 789 ret = move_temp_to_file(tmpfile, filename);
49a0f240 790 if (ret)
b721e01f 791 return ret;
49a0f240 792
b3661567 793 lst = &repo->packs;
182005b9
DB
794 while (*lst != target)
795 lst = &((*lst)->next);
796 *lst = (*lst)->next;
797
77d3ecee 798 if (verify_pack(target))
271421cd 799 return -1;
182005b9
DB
800 install_packed_git(target);
801
802 return 0;
803}
804
53f31389
MW
805static void abort_object_request(struct object_request *obj_req)
806{
807 if (obj_req->local >= 0) {
808 close(obj_req->local);
809 obj_req->local = -1;
810 }
811 unlink(obj_req->tmpfile);
812 if (obj_req->slot) {
a6080a0a 813 release_active_slot(obj_req->slot);
53f31389
MW
814 obj_req->slot = NULL;
815 }
816 release_object_request(obj_req);
817}
818
30ae764b 819static int fetch_object(struct walker *walker, struct alt_base *repo, unsigned char *sha1)
6eb7ed54
DB
820{
821 char *hex = sha1_to_hex(sha1);
29508e1e 822 int ret = 0;
e388ab74 823 struct object_request *obj_req = object_queue_head;
1d389ab6 824
a89fccd2 825 while (obj_req != NULL && hashcmp(obj_req->sha1, sha1))
e388ab74
NH
826 obj_req = obj_req->next;
827 if (obj_req == NULL)
1d389ab6
NH
828 return error("Couldn't find request for %s in the queue", hex);
829
e388ab74 830 if (has_sha1_file(obj_req->sha1)) {
53f31389 831 abort_object_request(obj_req);
11f0dafe
NH
832 return 0;
833 }
834
a7a8d378 835#ifdef USE_CURL_MULTI
e388ab74 836 while (obj_req->state == WAITING) {
29508e1e 837 step_active_slots();
1d389ab6 838 }
a7a8d378 839#else
30ae764b 840 start_object_request(walker, obj_req);
a7a8d378 841#endif
6eb7ed54 842
e388ab74
NH
843 while (obj_req->state == ACTIVE) {
844 run_active_slot(obj_req->slot);
a7a8d378 845 }
e388ab74
NH
846 if (obj_req->local != -1) {
847 close(obj_req->local); obj_req->local = -1;
313c4714 848 }
6eb7ed54 849
e388ab74 850 if (obj_req->state == ABORTED) {
29508e1e 851 ret = error("Request for %s aborted", hex);
e388ab74
NH
852 } else if (obj_req->curl_result != CURLE_OK &&
853 obj_req->http_code != 416) {
be4a015b 854 if (missing_target(obj_req))
e2029eb9
PB
855 ret = -1; /* Be silent, it is probably in a pack. */
856 else
857 ret = error("%s (curl_result = %d, http_code = %ld, sha1 = %s)",
e388ab74
NH
858 obj_req->errorstr, obj_req->curl_result,
859 obj_req->http_code, hex);
860 } else if (obj_req->zret != Z_STREAM_END) {
30ae764b 861 walker->corrupt_object_found++;
bd2afde8 862 ret = error("File %s (%s) corrupt", hex, obj_req->url);
a89fccd2 863 } else if (hashcmp(obj_req->sha1, obj_req->real_sha1)) {
bd2afde8 864 ret = error("File %s has bad hash", hex);
e388ab74 865 } else if (obj_req->rename < 0) {
7b934ec0
MW
866 ret = error("unable to write sha1 filename %s",
867 obj_req->filename);
6eb7ed54 868 }
49a0f240 869
e388ab74 870 release_object_request(obj_req);
29508e1e 871 return ret;
6eb7ed54
DB
872}
873
30ae764b 874static int fetch(struct walker *walker, unsigned char *sha1)
b3661567 875{
30ae764b
DB
876 struct walker_data *data = walker->data;
877 struct alt_base *altbase = data->alt;
1d389ab6 878
30ae764b 879 if (!fetch_object(walker, altbase, sha1))
1d389ab6 880 return 0;
b3661567 881 while (altbase) {
30ae764b 882 if (!fetch_pack(walker, altbase, sha1))
b3661567 883 return 0;
30ae764b 884 fetch_alternates(walker, data->alt->base);
b3661567
DB
885 altbase = altbase->next;
886 }
bd2afde8 887 return error("Unable to find %s under %s", sha1_to_hex(sha1),
30ae764b 888 data->alt->base);
b3661567
DB
889}
890
c13b2633 891static int fetch_ref(struct walker *walker, struct ref *ref)
cd541a68 892{
30ae764b 893 struct walker_data *data = walker->data;
c13b2633 894 return http_fetch_ref(data->alt->base, ref);
cd541a68
DB
895}
896
30ae764b
DB
897static void cleanup(struct walker *walker)
898{
899 struct walker_data *data = walker->data;
900 http_cleanup();
901
902 curl_slist_free_all(data->no_pragma_header);
903}
904
9fc6440d 905struct walker *get_http_walker(const char *url, struct remote *remote)
6eb7ed54 906{
9c880b3e 907 char *s;
30ae764b
DB
908 struct walker_data *data = xmalloc(sizeof(struct walker_data));
909 struct walker *walker = xmalloc(sizeof(struct walker));
6eb7ed54 910
9fc6440d 911 http_init(remote);
d402d556 912
30ae764b 913 data->no_pragma_header = curl_slist_append(NULL, "Pragma:");
3dcb90f5 914
30ae764b
DB
915 data->alt = xmalloc(sizeof(*data->alt));
916 data->alt->base = xmalloc(strlen(url) + 1);
917 strcpy(data->alt->base, url);
918 for (s = data->alt->base + strlen(data->alt->base) - 1; *s == '/'; --s)
9c880b3e 919 *s = 0;
6eb7ed54 920
30ae764b
DB
921 data->alt->got_indices = 0;
922 data->alt->packs = NULL;
923 data->alt->next = NULL;
924 data->got_alternates = -1;
fc57b6aa 925
30ae764b
DB
926 walker->corrupt_object_found = 0;
927 walker->fetch = fetch;
928 walker->fetch_ref = fetch_ref;
929 walker->prefetch = prefetch;
930 walker->cleanup = cleanup;
931 walker->data = data;
6eb7ed54 932
30ae764b
DB
933#ifdef USE_CURL_MULTI
934 add_fill_function(walker, (int (*)(void *)) fill_active_slot);
935#endif
8e29f6a0 936
30ae764b 937 return walker;
6eb7ed54 938}