Skip to content
This repository

HTTPS clone URL

Subversion checkout URL

You can clone with HTTPS or Subversion.

Download ZIP
tag: v1.7.11-rc0
Fetching contributors…

Octocat-spinner-32-eaf2f5

Cannot retrieve contributors at this time

file 592 lines (509 sloc) 14.275 kb
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591
#include "cache.h"
#include "commit.h"
#include "walker.h"
#include "http.h"

struct alt_base {
char *base;
int got_indices;
struct packed_git *packs;
struct alt_base *next;
};

enum object_request_state {
WAITING,
ABORTED,
ACTIVE,
COMPLETE
};

struct object_request {
struct walker *walker;
unsigned char sha1[20];
struct alt_base *repo;
enum object_request_state state;
struct http_object_request *req;
struct object_request *next;
};

struct alternates_request {
struct walker *walker;
const char *base;
char *url;
struct strbuf *buffer;
struct active_request_slot *slot;
int http_specific;
};

struct walker_data {
const char *url;
int got_alternates;
struct alt_base *alt;
};

static struct object_request *object_queue_head;

static void fetch_alternates(struct walker *walker, const char *base);

static void process_object_response(void *callback_data);

static void start_object_request(struct walker *walker,
struct object_request *obj_req)
{
struct active_request_slot *slot;
struct http_object_request *req;

req = new_http_object_request(obj_req->repo->base, obj_req->sha1);
if (req == NULL) {
obj_req->state = ABORTED;
return;
}
obj_req->req = req;

slot = req->slot;
slot->callback_func = process_object_response;
slot->callback_data = obj_req;

/* Try to get the request started, abort the request on error */
obj_req->state = ACTIVE;
if (!start_active_slot(slot)) {
obj_req->state = ABORTED;
release_http_object_request(req);
return;
}
}

static void finish_object_request(struct object_request *obj_req)
{
if (finish_http_object_request(obj_req->req))
return;

if (obj_req->req->rename == 0)
walker_say(obj_req->walker, "got %s\n", sha1_to_hex(obj_req->sha1));
}

static void process_object_response(void *callback_data)
{
struct object_request *obj_req =
(struct object_request *)callback_data;
struct walker *walker = obj_req->walker;
struct walker_data *data = walker->data;
struct alt_base *alt = data->alt;

process_http_object_request(obj_req->req);
obj_req->state = COMPLETE;

/* Use alternates if necessary */
if (missing_target(obj_req->req)) {
fetch_alternates(walker, alt->base);
if (obj_req->repo->next != NULL) {
obj_req->repo =
obj_req->repo->next;
release_http_object_request(obj_req->req);
start_object_request(walker, obj_req);
return;
}
}

finish_object_request(obj_req);
}

static void release_object_request(struct object_request *obj_req)
{
struct object_request *entry = object_queue_head;

if (obj_req->req !=NULL && obj_req->req->localfile != -1)
error("fd leakage in release: %d", obj_req->req->localfile);
if (obj_req == object_queue_head) {
object_queue_head = obj_req->next;
} else {
while (entry->next != NULL && entry->next != obj_req)
entry = entry->next;
if (entry->next == obj_req)
entry->next = entry->next->next;
}

free(obj_req);
}

#ifdef USE_CURL_MULTI
static int fill_active_slot(struct walker *walker)
{
struct object_request *obj_req;

for (obj_req = object_queue_head; obj_req; obj_req = obj_req->next) {
if (obj_req->state == WAITING) {
if (has_sha1_file(obj_req->sha1))
obj_req->state = COMPLETE;
else {
start_object_request(walker, obj_req);
return 1;
}
}
}
return 0;
}
#endif

static void prefetch(struct walker *walker, unsigned char *sha1)
{
struct object_request *newreq;
struct object_request *tail;
struct walker_data *data = walker->data;

newreq = xmalloc(sizeof(*newreq));
newreq->walker = walker;
hashcpy(newreq->sha1, sha1);
newreq->repo = data->alt;
newreq->state = WAITING;
newreq->req = NULL;
newreq->next = NULL;

http_is_verbose = walker->get_verbosely;

if (object_queue_head == NULL) {
object_queue_head = newreq;
} else {
tail = object_queue_head;
while (tail->next != NULL)
tail = tail->next;
tail->next = newreq;
}

#ifdef USE_CURL_MULTI
fill_active_slots();
step_active_slots();
#endif
}

static void process_alternates_response(void *callback_data)
{
struct alternates_request *alt_req =
(struct alternates_request *)callback_data;
struct walker *walker = alt_req->walker;
struct walker_data *cdata = walker->data;
struct active_request_slot *slot = alt_req->slot;
struct alt_base *tail = cdata->alt;
const char *base = alt_req->base;
const char null_byte = '\0';
char *data;
int i = 0;

if (alt_req->http_specific) {
if (slot->curl_result != CURLE_OK ||
!alt_req->buffer->len) {

/* Try reusing the slot to get non-http alternates */
alt_req->http_specific = 0;
sprintf(alt_req->url, "%s/objects/info/alternates",
base);
curl_easy_setopt(slot->curl, CURLOPT_URL,
alt_req->url);
active_requests++;
slot->in_use = 1;
if (slot->finished != NULL)
(*slot->finished) = 0;
if (!start_active_slot(slot)) {
cdata->got_alternates = -1;
slot->in_use = 0;
if (slot->finished != NULL)
(*slot->finished) = 1;
}
return;
}
} else if (slot->curl_result != CURLE_OK) {
if (!missing_target(slot)) {
cdata->got_alternates = -1;
return;
}
}

fwrite_buffer((char *)&null_byte, 1, 1, alt_req->buffer);
alt_req->buffer->len--;
data = alt_req->buffer->buf;

while (i < alt_req->buffer->len) {
int posn = i;
while (posn < alt_req->buffer->len && data[posn] != '\n')
posn++;
if (data[posn] == '\n') {
int okay = 0;
int serverlen = 0;
struct alt_base *newalt;
char *target = NULL;
if (data[i] == '/') {
/*
* This counts
* http://git.host/pub/scm/linux.git/
* -----------here^
* so memcpy(dst, base, serverlen) will
* copy up to "...git.host".
*/
const char *colon_ss = strstr(base,"://");
if (colon_ss) {
serverlen = (strchr(colon_ss + 3, '/')
- base);
okay = 1;
}
} else if (!memcmp(data + i, "../", 3)) {
/*
* Relative URL; chop the corresponding
* number of subpath from base (and ../
* from data), and concatenate the result.
*
* The code first drops ../ from data, and
* then drops one ../ from data and one path
* from base. IOW, one extra ../ is dropped
* from data than path is dropped from base.
*
* This is not wrong. The alternate in
* http://git.host/pub/scm/linux.git/
* to borrow from
* http://git.host/pub/scm/linus.git/
* is ../../linus.git/objects/. You need
* two ../../ to borrow from your direct
* neighbour.
*/
i += 3;
serverlen = strlen(base);
while (i + 2 < posn &&
!memcmp(data + i, "../", 3)) {
do {
serverlen--;
} while (serverlen &&
base[serverlen - 1] != '/');
i += 3;
}
/* If the server got removed, give up. */
okay = strchr(base, ':') - base + 3 <
serverlen;
} else if (alt_req->http_specific) {
char *colon = strchr(data + i, ':');
char *slash = strchr(data + i, '/');
if (colon && slash && colon < data + posn &&
slash < data + posn && colon < slash) {
okay = 1;
}
}
/* skip "objects\n" at end */
if (okay) {
target = xmalloc(serverlen + posn - i - 6);
memcpy(target, base, serverlen);
memcpy(target + serverlen, data + i,
posn - i - 7);
target[serverlen + posn - i - 7] = 0;
if (walker->get_verbosely)
fprintf(stderr,
"Also look at %s\n", target);
newalt = xmalloc(sizeof(*newalt));
newalt->next = NULL;
newalt->base = target;
newalt->got_indices = 0;
newalt->packs = NULL;

while (tail->next != NULL)
tail = tail->next;
tail->next = newalt;
}
}
i = posn + 1;
}

cdata->got_alternates = 1;
}

static void fetch_alternates(struct walker *walker, const char *base)
{
struct strbuf buffer = STRBUF_INIT;
char *url;
struct active_request_slot *slot;
struct alternates_request alt_req;
struct walker_data *cdata = walker->data;

/*
* If another request has already started fetching alternates,
* wait for them to arrive and return to processing this request's
* curl message
*/
#ifdef USE_CURL_MULTI
while (cdata->got_alternates == 0) {
step_active_slots();
}
#endif

/* Nothing to do if they've already been fetched */
if (cdata->got_alternates == 1)
return;

/* Start the fetch */
cdata->got_alternates = 0;

if (walker->get_verbosely)
fprintf(stderr, "Getting alternates list for %s\n", base);

url = xmalloc(strlen(base) + 31);
sprintf(url, "%s/objects/info/http-alternates", base);

/*
* Use a callback to process the result, since another request
* may fail and need to have alternates loaded before continuing
*/
slot = get_active_slot();
slot->callback_func = process_alternates_response;
alt_req.walker = walker;
slot->callback_data = &alt_req;

curl_easy_setopt(slot->curl, CURLOPT_FILE, &buffer);
curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
curl_easy_setopt(slot->curl, CURLOPT_URL, url);

alt_req.base = base;
alt_req.url = url;
alt_req.buffer = &buffer;
alt_req.http_specific = 1;
alt_req.slot = slot;

if (start_active_slot(slot))
run_active_slot(slot);
else
cdata->got_alternates = -1;

strbuf_release(&buffer);
free(url);
}

static int fetch_indices(struct walker *walker, struct alt_base *repo)
{
int ret;

if (repo->got_indices)
return 0;

if (walker->get_verbosely)
fprintf(stderr, "Getting pack list for %s\n", repo->base);

switch (http_get_info_packs(repo->base, &repo->packs)) {
case HTTP_OK:
case HTTP_MISSING_TARGET:
repo->got_indices = 1;
ret = 0;
break;
default:
repo->got_indices = 0;
ret = -1;
}

return ret;
}

static int fetch_pack(struct walker *walker, struct alt_base *repo, unsigned char *sha1)
{
struct packed_git *target;
int ret;
struct slot_results results;
struct http_pack_request *preq;

if (fetch_indices(walker, repo))
return -1;
target = find_sha1_pack(sha1, repo->packs);
if (!target)
return -1;

if (walker->get_verbosely) {
fprintf(stderr, "Getting pack %s\n",
sha1_to_hex(target->sha1));
fprintf(stderr, " which contains %s\n",
sha1_to_hex(sha1));
}

preq = new_http_pack_request(target, repo->base);
if (preq == NULL)
goto abort;
preq->lst = &repo->packs;
preq->slot->results = &results;

if (start_active_slot(preq->slot)) {
run_active_slot(preq->slot);
if (results.curl_result != CURLE_OK) {
error("Unable to get pack file %s\n%s", preq->url,
curl_errorstr);
goto abort;
}
} else {
error("Unable to start request");
goto abort;
}

ret = finish_http_pack_request(preq);
release_http_pack_request(preq);
if (ret)
return ret;

return 0;

abort:
return -1;
}

static void abort_object_request(struct object_request *obj_req)
{
release_object_request(obj_req);
}

static int fetch_object(struct walker *walker, struct alt_base *repo, unsigned char *sha1)
{
char *hex = sha1_to_hex(sha1);
int ret = 0;
struct object_request *obj_req = object_queue_head;
struct http_object_request *req;

while (obj_req != NULL && hashcmp(obj_req->sha1, sha1))
obj_req = obj_req->next;
if (obj_req == NULL)
return error("Couldn't find request for %s in the queue", hex);

if (has_sha1_file(obj_req->sha1)) {
if (obj_req->req != NULL)
abort_http_object_request(obj_req->req);
abort_object_request(obj_req);
return 0;
}

#ifdef USE_CURL_MULTI
while (obj_req->state == WAITING)
step_active_slots();
#else
start_object_request(walker, obj_req);
#endif

/*
* obj_req->req might change when fetching alternates in the callback
* process_object_response; therefore, the "shortcut" variable, req,
* is used only after we're done with slots.
*/
while (obj_req->state == ACTIVE)
run_active_slot(obj_req->req->slot);

req = obj_req->req;

if (req->localfile != -1) {
close(req->localfile);
req->localfile = -1;
}

if (obj_req->state == ABORTED) {
ret = error("Request for %s aborted", hex);
} else if (req->curl_result != CURLE_OK &&
req->http_code != 416) {
if (missing_target(req))
ret = -1; /* Be silent, it is probably in a pack. */
else
ret = error("%s (curl_result = %d, http_code = %ld, sha1 = %s)",
req->errorstr, req->curl_result,
req->http_code, hex);
} else if (req->zret != Z_STREAM_END) {
walker->corrupt_object_found++;
ret = error("File %s (%s) corrupt", hex, req->url);
} else if (hashcmp(obj_req->sha1, req->real_sha1)) {
ret = error("File %s has bad hash", hex);
} else if (req->rename < 0) {
ret = error("unable to write sha1 filename %s",
sha1_file_name(req->sha1));
}

release_http_object_request(req);
release_object_request(obj_req);
return ret;
}

static int fetch(struct walker *walker, unsigned char *sha1)
{
struct walker_data *data = walker->data;
struct alt_base *altbase = data->alt;

if (!fetch_object(walker, altbase, sha1))
return 0;
while (altbase) {
if (!fetch_pack(walker, altbase, sha1))
return 0;
fetch_alternates(walker, data->alt->base);
altbase = altbase->next;
}
return error("Unable to find %s under %s", sha1_to_hex(sha1),
data->alt->base);
}

static int fetch_ref(struct walker *walker, struct ref *ref)
{
struct walker_data *data = walker->data;
return http_fetch_ref(data->alt->base, ref);
}

static void cleanup(struct walker *walker)
{
struct walker_data *data = walker->data;
struct alt_base *alt, *alt_next;

if (data) {
alt = data->alt;
while (alt) {
alt_next = alt->next;

free(alt->base);
free(alt);

alt = alt_next;
}
free(data);
walker->data = NULL;
}
}

struct walker *get_http_walker(const char *url)
{
char *s;
struct walker_data *data = xmalloc(sizeof(struct walker_data));
struct walker *walker = xmalloc(sizeof(struct walker));

data->alt = xmalloc(sizeof(*data->alt));
data->alt->base = xmalloc(strlen(url) + 1);
strcpy(data->alt->base, url);
for (s = data->alt->base + strlen(data->alt->base) - 1; *s == '/'; --s)
*s = 0;

data->alt->got_indices = 0;
data->alt->packs = NULL;
data->alt->next = NULL;
data->got_alternates = -1;

walker->corrupt_object_found = 0;
walker->fetch = fetch;
walker->fetch_ref = fetch_ref;
walker->prefetch = prefetch;
walker->cleanup = cleanup;
walker->data = data;

#ifdef USE_CURL_MULTI
add_fill_function(walker, (int (*)(void *)) fill_active_slot);
#endif

return walker;
}
Something went wrong with that request. Please try again.