git.oblomov.eu Git - git/blob - http-push.c

   1 #include "cache.h"
   2 #include "commit.h"
   3 #include "tag.h"
   4 #include "blob.h"
   5 #include "http.h"
   6 #include "refs.h"
   7 #include "diff.h"
   8 #include "revision.h"
   9 #include "exec_cmd.h"
  10 #include "remote.h"
  11 #include "list-objects.h"
  12 #include "sigchain.h"
  13 #include "argv-array.h"
  14 #include "packfile.h"
  15
  16 #ifdef EXPAT_NEEDS_XMLPARSE_H
  17 #include <xmlparse.h>
  18 #else
  19 #include <expat.h>
  20 #endif
  21
  22 static const char http_push_usage[] =
  23 "git http-push [--all] [--dry-run] [--force] [--verbose] <remote> [<head>...]\n";
  24
  25 #ifndef XML_STATUS_OK
  26 enum XML_Status {
  27   XML_STATUS_OK = 1,
  28   XML_STATUS_ERROR = 0
  29 };
  30 #define XML_STATUS_OK    1
  31 #define XML_STATUS_ERROR 0
  32 #endif
  33
  34 #define PREV_BUF_SIZE 4096
  35
  36 /* DAV methods */
  37 #define DAV_LOCK "LOCK"
  38 #define DAV_MKCOL "MKCOL"
  39 #define DAV_MOVE "MOVE"
  40 #define DAV_PROPFIND "PROPFIND"
  41 #define DAV_PUT "PUT"
  42 #define DAV_UNLOCK "UNLOCK"
  43 #define DAV_DELETE "DELETE"
  44
  45 /* DAV lock flags */
  46 #define DAV_PROP_LOCKWR (1u << 0)
  47 #define DAV_PROP_LOCKEX (1u << 1)
  48 #define DAV_LOCK_OK (1u << 2)
  49
  50 /* DAV XML properties */
  51 #define DAV_CTX_LOCKENTRY ".multistatus.response.propstat.prop.supportedlock.lockentry"
  52 #define DAV_CTX_LOCKTYPE_WRITE ".multistatus.response.propstat.prop.supportedlock.lockentry.locktype.write"
  53 #define DAV_CTX_LOCKTYPE_EXCLUSIVE ".multistatus.response.propstat.prop.supportedlock.lockentry.lockscope.exclusive"
  54 #define DAV_ACTIVELOCK_OWNER ".prop.lockdiscovery.activelock.owner.href"
  55 #define DAV_ACTIVELOCK_TIMEOUT ".prop.lockdiscovery.activelock.timeout"
  56 #define DAV_ACTIVELOCK_TOKEN ".prop.lockdiscovery.activelock.locktoken.href"
  57 #define DAV_PROPFIND_RESP ".multistatus.response"
  58 #define DAV_PROPFIND_NAME ".multistatus.response.href"
  59 #define DAV_PROPFIND_COLLECTION ".multistatus.response.propstat.prop.resourcetype.collection"
  60
  61 /* DAV request body templates */
  62 #define PROPFIND_SUPPORTEDLOCK_REQUEST "<?xml version=\"1.0\" encoding=\"utf-8\" ?>\n<D:propfind xmlns:D=\"DAV:\">\n<D:prop xmlns:R=\"%s\">\n<D:supportedlock/>\n</D:prop>\n</D:propfind>"
  63 #define PROPFIND_ALL_REQUEST "<?xml version=\"1.0\" encoding=\"utf-8\" ?>\n<D:propfind xmlns:D=\"DAV:\">\n<D:allprop/>\n</D:propfind>"
  64 #define LOCK_REQUEST "<?xml version=\"1.0\" encoding=\"utf-8\" ?>\n<D:lockinfo xmlns:D=\"DAV:\">\n<D:lockscope><D:exclusive/></D:lockscope>\n<D:locktype><D:write/></D:locktype>\n<D:owner>\n<D:href>mailto:%s</D:href>\n</D:owner>\n</D:lockinfo>"
  65
  66 #define LOCK_TIME 600
  67 #define LOCK_REFRESH 30
  68
  69 /* Remember to update object flag allocation in object.h */
  70 #define LOCAL    (1u<<16)
  71 #define REMOTE   (1u<<17)
  72 #define FETCHING (1u<<18)
  73 #define PUSHING  (1u<<19)
  74
  75 /* We allow "recursive" symbolic refs. Only within reason, though */
  76 #define MAXDEPTH 5
  77
  78 static int pushing;
  79 static int aborted;
  80 static signed char remote_dir_exists[256];
  81
  82 static int push_verbosely;
  83 static int push_all = MATCH_REFS_NONE;
  84 static int force_all;
  85 static int dry_run;
  86 static int helper_status;
  87
  88 static struct object_list *objects;
  89
  90 struct repo {
  91         char *url;
  92         char *path;
  93         int path_len;
  94         int has_info_refs;
  95         int can_update_info_refs;
  96         int has_info_packs;
  97         struct packed_git *packs;
  98         struct remote_lock *locks;
  99 };
 100
 101 static struct repo *repo;
 102
 103 enum transfer_state {
 104         NEED_FETCH,
 105         RUN_FETCH_LOOSE,
 106         RUN_FETCH_PACKED,
 107         NEED_PUSH,
 108         RUN_MKCOL,
 109         RUN_PUT,
 110         RUN_MOVE,
 111         ABORTED,
 112         COMPLETE
 113 };
 114
 115 struct transfer_request {
 116         struct object *obj;
 117         char *url;
 118         char *dest;
 119         struct remote_lock *lock;
 120         struct curl_slist *headers;
 121         struct buffer buffer;
 122         enum transfer_state state;
 123         CURLcode curl_result;
 124         char errorstr[CURL_ERROR_SIZE];
 125         long http_code;
 126         void *userData;
 127         struct active_request_slot *slot;
 128         struct transfer_request *next;
 129 };
 130
 131 static struct transfer_request *request_queue_head;
 132
 133 struct xml_ctx {
 134         char *name;
 135         int len;
 136         char *cdata;
 137         void (*userFunc)(struct xml_ctx *ctx, int tag_closed);
 138         void *userData;
 139 };
 140
 141 struct remote_lock {
 142         char *url;
 143         char *owner;
 144         char *token;
 145         char tmpfile_suffix[41];
 146         time_t start_time;
 147         long timeout;
 148         int refreshing;
 149         struct remote_lock *next;
 150 };
 151
 152 /* Flags that control remote_ls processing */
 153 #define PROCESS_FILES (1u << 0)
 154 #define PROCESS_DIRS  (1u << 1)
 155 #define RECURSIVE     (1u << 2)
 156
 157 /* Flags that remote_ls passes to callback functions */
 158 #define IS_DIR (1u << 0)
 159
 160 struct remote_ls_ctx {
 161         char *path;
 162         void (*userFunc)(struct remote_ls_ctx *ls);
 163         void *userData;
 164         int flags;
 165         char *dentry_name;
 166         int dentry_flags;
 167         struct remote_ls_ctx *parent;
 168 };
 169
 170 /* get_dav_token_headers options */
 171 enum dav_header_flag {
 172         DAV_HEADER_IF = (1u << 0),
 173         DAV_HEADER_LOCK = (1u << 1),
 174         DAV_HEADER_TIMEOUT = (1u << 2)
 175 };
 176
 177 static char *xml_entities(const char *s)
 178 {
 179         struct strbuf buf = STRBUF_INIT;
 180         strbuf_addstr_xml_quoted(&buf, s);
 181         return strbuf_detach(&buf, NULL);
 182 }
 183
 184 static void curl_setup_http_get(CURL *curl, const char *url,
 185                 const char *custom_req)
 186 {
 187         curl_easy_setopt(curl, CURLOPT_HTTPGET, 1);
 188         curl_easy_setopt(curl, CURLOPT_URL, url);
 189         curl_easy_setopt(curl, CURLOPT_CUSTOMREQUEST, custom_req);
 190         curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, fwrite_null);
 191 }
 192
 193 static void curl_setup_http(CURL *curl, const char *url,
 194                 const char *custom_req, struct buffer *buffer,
 195                 curl_write_callback write_fn)
 196 {
 197         curl_easy_setopt(curl, CURLOPT_PUT, 1);
 198         curl_easy_setopt(curl, CURLOPT_URL, url);
 199         curl_easy_setopt(curl, CURLOPT_INFILE, buffer);
 200         curl_easy_setopt(curl, CURLOPT_INFILESIZE, buffer->buf.len);
 201         curl_easy_setopt(curl, CURLOPT_READFUNCTION, fread_buffer);
 202 #ifndef NO_CURL_IOCTL
 203         curl_easy_setopt(curl, CURLOPT_IOCTLFUNCTION, ioctl_buffer);
 204         curl_easy_setopt(curl, CURLOPT_IOCTLDATA, buffer);
 205 #endif
 206         curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, write_fn);
 207         curl_easy_setopt(curl, CURLOPT_NOBODY, 0);
 208         curl_easy_setopt(curl, CURLOPT_CUSTOMREQUEST, custom_req);
 209         curl_easy_setopt(curl, CURLOPT_UPLOAD, 1);
 210 }
 211
 212 static struct curl_slist *get_dav_token_headers(struct remote_lock *lock, enum dav_header_flag options)
 213 {
 214         struct strbuf buf = STRBUF_INIT;
 215         struct curl_slist *dav_headers = http_copy_default_headers();
 216
 217         if (options & DAV_HEADER_IF) {
 218                 strbuf_addf(&buf, "If: (<%s>)", lock->token);
 219                 dav_headers = curl_slist_append(dav_headers, buf.buf);
 220                 strbuf_reset(&buf);
 221         }
 222         if (options & DAV_HEADER_LOCK) {
 223                 strbuf_addf(&buf, "Lock-Token: <%s>", lock->token);
 224                 dav_headers = curl_slist_append(dav_headers, buf.buf);
 225                 strbuf_reset(&buf);
 226         }
 227         if (options & DAV_HEADER_TIMEOUT) {
 228                 strbuf_addf(&buf, "Timeout: Second-%ld", lock->timeout);
 229                 dav_headers = curl_slist_append(dav_headers, buf.buf);
 230                 strbuf_reset(&buf);
 231         }
 232         strbuf_release(&buf);
 233
 234         return dav_headers;
 235 }
 236
 237 static void finish_request(struct transfer_request *request);
 238 static void release_request(struct transfer_request *request);
 239
 240 static void process_response(void *callback_data)
 241 {
 242         struct transfer_request *request =
 243                 (struct transfer_request *)callback_data;
 244
 245         finish_request(request);
 246 }
 247
 248 #ifdef USE_CURL_MULTI
 249
 250 static void start_fetch_loose(struct transfer_request *request)
 251 {
 252         struct active_request_slot *slot;
 253         struct http_object_request *obj_req;
 254
 255         obj_req = new_http_object_request(repo->url, request->obj->oid.hash);
 256         if (obj_req == NULL) {
 257                 request->state = ABORTED;
 258                 return;
 259         }
 260
 261         slot = obj_req->slot;
 262         slot->callback_func = process_response;
 263         slot->callback_data = request;
 264         request->slot = slot;
 265         request->userData = obj_req;
 266
 267         /* Try to get the request started, abort the request on error */
 268         request->state = RUN_FETCH_LOOSE;
 269         if (!start_active_slot(slot)) {
 270                 fprintf(stderr, "Unable to start GET request\n");
 271                 repo->can_update_info_refs = 0;
 272                 release_http_object_request(obj_req);
 273                 release_request(request);
 274         }
 275 }
 276
 277 static void start_mkcol(struct transfer_request *request)
 278 {
 279         char *hex = oid_to_hex(&request->obj->oid);
 280         struct active_request_slot *slot;
 281
 282         request->url = get_remote_object_url(repo->url, hex, 1);
 283
 284         slot = get_active_slot();
 285         slot->callback_func = process_response;
 286         slot->callback_data = request;
 287         curl_setup_http_get(slot->curl, request->url, DAV_MKCOL);
 288         curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, request->errorstr);
 289
 290         if (start_active_slot(slot)) {
 291                 request->slot = slot;
 292                 request->state = RUN_MKCOL;
 293         } else {
 294                 request->state = ABORTED;
 295                 FREE_AND_NULL(request->url);
 296         }
 297 }
 298 #endif
 299
 300 static void start_fetch_packed(struct transfer_request *request)
 301 {
 302         struct packed_git *target;
 303
 304         struct transfer_request *check_request = request_queue_head;
 305         struct http_pack_request *preq;
 306
 307         target = find_sha1_pack(request->obj->oid.hash, repo->packs);
 308         if (!target) {
 309                 fprintf(stderr, "Unable to fetch %s, will not be able to update server info refs\n", oid_to_hex(&request->obj->oid));
 310                 repo->can_update_info_refs = 0;
 311                 release_request(request);
 312                 return;
 313         }
 314
 315         fprintf(stderr, "Fetching pack %s\n", sha1_to_hex(target->sha1));
 316         fprintf(stderr, " which contains %s\n", oid_to_hex(&request->obj->oid));
 317
 318         preq = new_http_pack_request(target, repo->url);
 319         if (preq == NULL) {
 320                 repo->can_update_info_refs = 0;
 321                 return;
 322         }
 323         preq->lst = &repo->packs;
 324
 325         /* Make sure there isn't another open request for this pack */
 326         while (check_request) {
 327                 if (check_request->state == RUN_FETCH_PACKED &&
 328                     !strcmp(check_request->url, preq->url)) {
 329                         release_http_pack_request(preq);
 330                         release_request(request);
 331                         return;
 332                 }
 333                 check_request = check_request->next;
 334         }
 335
 336         preq->slot->callback_func = process_response;
 337         preq->slot->callback_data = request;
 338         request->slot = preq->slot;
 339         request->userData = preq;
 340
 341         /* Try to get the request started, abort the request on error */
 342         request->state = RUN_FETCH_PACKED;
 343         if (!start_active_slot(preq->slot)) {
 344                 fprintf(stderr, "Unable to start GET request\n");
 345                 release_http_pack_request(preq);
 346                 repo->can_update_info_refs = 0;
 347                 release_request(request);
 348         }
 349 }
 350
 351 static void start_put(struct transfer_request *request)
 352 {
 353         char *hex = oid_to_hex(&request->obj->oid);
 354         struct active_request_slot *slot;
 355         struct strbuf buf = STRBUF_INIT;
 356         enum object_type type;
 357         char hdr[50];
 358         void *unpacked;
 359         unsigned long len;
 360         int hdrlen;
 361         ssize_t size;
 362         git_zstream stream;
 363
 364         unpacked = read_sha1_file(request->obj->oid.hash, &type, &len);
 365         hdrlen = xsnprintf(hdr, sizeof(hdr), "%s %lu", typename(type), len) + 1;
 366
 367         /* Set it up */
 368         git_deflate_init(&stream, zlib_compression_level);
 369         size = git_deflate_bound(&stream, len + hdrlen);
 370         strbuf_init(&request->buffer.buf, size);
 371         request->buffer.posn = 0;
 372
 373         /* Compress it */
 374         stream.next_out = (unsigned char *)request->buffer.buf.buf;
 375         stream.avail_out = size;
 376
 377         /* First header.. */
 378         stream.next_in = (void *)hdr;
 379         stream.avail_in = hdrlen;
 380         while (git_deflate(&stream, 0) == Z_OK)
 381                 ; /* nothing */
 382
 383         /* Then the data itself.. */
 384         stream.next_in = unpacked;
 385         stream.avail_in = len;
 386         while (git_deflate(&stream, Z_FINISH) == Z_OK)
 387                 ; /* nothing */
 388         git_deflate_end(&stream);
 389         free(unpacked);
 390
 391         request->buffer.buf.len = stream.total_out;
 392
 393         strbuf_addstr(&buf, "Destination: ");
 394         append_remote_object_url(&buf, repo->url, hex, 0);
 395         request->dest = strbuf_detach(&buf, NULL);
 396
 397         append_remote_object_url(&buf, repo->url, hex, 0);
 398         strbuf_add(&buf, request->lock->tmpfile_suffix, 41);
 399         request->url = strbuf_detach(&buf, NULL);
 400
 401         slot = get_active_slot();
 402         slot->callback_func = process_response;
 403         slot->callback_data = request;
 404         curl_setup_http(slot->curl, request->url, DAV_PUT,
 405                         &request->buffer, fwrite_null);
 406
 407         if (start_active_slot(slot)) {
 408                 request->slot = slot;
 409                 request->state = RUN_PUT;
 410         } else {
 411                 request->state = ABORTED;
 412                 FREE_AND_NULL(request->url);
 413         }
 414 }
 415
 416 static void start_move(struct transfer_request *request)
 417 {
 418         struct active_request_slot *slot;
 419         struct curl_slist *dav_headers = http_copy_default_headers();
 420
 421         slot = get_active_slot();
 422         slot->callback_func = process_response;
 423         slot->callback_data = request;
 424         curl_setup_http_get(slot->curl, request->url, DAV_MOVE);
 425         dav_headers = curl_slist_append(dav_headers, request->dest);
 426         dav_headers = curl_slist_append(dav_headers, "Overwrite: T");
 427         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
 428
 429         if (start_active_slot(slot)) {
 430                 request->slot = slot;
 431                 request->state = RUN_MOVE;
 432         } else {
 433                 request->state = ABORTED;
 434                 FREE_AND_NULL(request->url);
 435         }
 436 }
 437
 438 static int refresh_lock(struct remote_lock *lock)
 439 {
 440         struct active_request_slot *slot;
 441         struct slot_results results;
 442         struct curl_slist *dav_headers;
 443         int rc = 0;
 444
 445         lock->refreshing = 1;
 446
 447         dav_headers = get_dav_token_headers(lock, DAV_HEADER_IF | DAV_HEADER_TIMEOUT);
 448
 449         slot = get_active_slot();
 450         slot->results = &results;
 451         curl_setup_http_get(slot->curl, lock->url, DAV_LOCK);
 452         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
 453
 454         if (start_active_slot(slot)) {
 455                 run_active_slot(slot);
 456                 if (results.curl_result != CURLE_OK) {
 457                         fprintf(stderr, "LOCK HTTP error %ld\n",
 458                                 results.http_code);
 459                 } else {
 460                         lock->start_time = time(NULL);
 461                         rc = 1;
 462                 }
 463         }
 464
 465         lock->refreshing = 0;
 466         curl_slist_free_all(dav_headers);
 467
 468         return rc;
 469 }
 470
 471 static void check_locks(void)
 472 {
 473         struct remote_lock *lock = repo->locks;
 474         time_t current_time = time(NULL);
 475         int time_remaining;
 476
 477         while (lock) {
 478                 time_remaining = lock->start_time + lock->timeout -
 479                         current_time;
 480                 if (!lock->refreshing && time_remaining < LOCK_REFRESH) {
 481                         if (!refresh_lock(lock)) {
 482                                 fprintf(stderr,
 483                                         "Unable to refresh lock for %s\n",
 484                                         lock->url);
 485                                 aborted = 1;
 486                                 return;
 487                         }
 488                 }
 489                 lock = lock->next;
 490         }
 491 }
 492
 493 static void release_request(struct transfer_request *request)
 494 {
 495         struct transfer_request *entry = request_queue_head;
 496
 497         if (request == request_queue_head) {
 498                 request_queue_head = request->next;
 499         } else {
 500                 while (entry->next != NULL && entry->next != request)
 501                         entry = entry->next;
 502                 if (entry->next == request)
 503                         entry->next = entry->next->next;
 504         }
 505
 506         free(request->url);
 507         free(request);
 508 }
 509
 510 static void finish_request(struct transfer_request *request)
 511 {
 512         struct http_pack_request *preq;
 513         struct http_object_request *obj_req;
 514
 515         request->curl_result = request->slot->curl_result;
 516         request->http_code = request->slot->http_code;
 517         request->slot = NULL;
 518
 519         /* Keep locks active */
 520         check_locks();
 521
 522         if (request->headers != NULL)
 523                 curl_slist_free_all(request->headers);
 524
 525         /* URL is reused for MOVE after PUT */
 526         if (request->state != RUN_PUT) {
 527                 FREE_AND_NULL(request->url);
 528         }
 529
 530         if (request->state == RUN_MKCOL) {
 531                 if (request->curl_result == CURLE_OK ||
 532                     request->http_code == 405) {
 533                         remote_dir_exists[request->obj->oid.hash[0]] = 1;
 534                         start_put(request);
 535                 } else {
 536                         fprintf(stderr, "MKCOL %s failed, aborting (%d/%ld)\n",
 537                                 oid_to_hex(&request->obj->oid),
 538                                 request->curl_result, request->http_code);
 539                         request->state = ABORTED;
 540                         aborted = 1;
 541                 }
 542         } else if (request->state == RUN_PUT) {
 543                 if (request->curl_result == CURLE_OK) {
 544                         start_move(request);
 545                 } else {
 546                         fprintf(stderr, "PUT %s failed, aborting (%d/%ld)\n",
 547                                 oid_to_hex(&request->obj->oid),
 548                                 request->curl_result, request->http_code);
 549                         request->state = ABORTED;
 550                         aborted = 1;
 551                 }
 552         } else if (request->state == RUN_MOVE) {
 553                 if (request->curl_result == CURLE_OK) {
 554                         if (push_verbosely)
 555                                 fprintf(stderr, "    sent %s\n",
 556                                         oid_to_hex(&request->obj->oid));
 557                         request->obj->flags |= REMOTE;
 558                         release_request(request);
 559                 } else {
 560                         fprintf(stderr, "MOVE %s failed, aborting (%d/%ld)\n",
 561                                 oid_to_hex(&request->obj->oid),
 562                                 request->curl_result, request->http_code);
 563                         request->state = ABORTED;
 564                         aborted = 1;
 565                 }
 566         } else if (request->state == RUN_FETCH_LOOSE) {
 567                 obj_req = (struct http_object_request *)request->userData;
 568
 569                 if (finish_http_object_request(obj_req) == 0)
 570                         if (obj_req->rename == 0)
 571                                 request->obj->flags |= (LOCAL | REMOTE);
 572
 573                 /* Try fetching packed if necessary */
 574                 if (request->obj->flags & LOCAL) {
 575                         release_http_object_request(obj_req);
 576                         release_request(request);
 577                 } else
 578                         start_fetch_packed(request);
 579
 580         } else if (request->state == RUN_FETCH_PACKED) {
 581                 int fail = 1;
 582                 if (request->curl_result != CURLE_OK) {
 583                         fprintf(stderr, "Unable to get pack file %s\n%s",
 584                                 request->url, curl_errorstr);
 585                 } else {
 586                         preq = (struct http_pack_request *)request->userData;
 587
 588                         if (preq) {
 589                                 if (finish_http_pack_request(preq) == 0)
 590                                         fail = 0;
 591                                 release_http_pack_request(preq);
 592                         }
 593                 }
 594                 if (fail)
 595                         repo->can_update_info_refs = 0;
 596                 release_request(request);
 597         }
 598 }
 599
 600 #ifdef USE_CURL_MULTI
 601 static int is_running_queue;
 602 static int fill_active_slot(void *unused)
 603 {
 604         struct transfer_request *request;
 605
 606         if (aborted || !is_running_queue)
 607                 return 0;
 608
 609         for (request = request_queue_head; request; request = request->next) {
 610                 if (request->state == NEED_FETCH) {
 611                         start_fetch_loose(request);
 612                         return 1;
 613                 } else if (pushing && request->state == NEED_PUSH) {
 614                         if (remote_dir_exists[request->obj->oid.hash[0]] == 1) {
 615                                 start_put(request);
 616                         } else {
 617                                 start_mkcol(request);
 618                         }
 619                         return 1;
 620                 }
 621         }
 622         return 0;
 623 }
 624 #endif
 625
 626 static void get_remote_object_list(unsigned char parent);
 627
 628 static void add_fetch_request(struct object *obj)
 629 {
 630         struct transfer_request *request;
 631
 632         check_locks();
 633
 634         /*
 635          * Don't fetch the object if it's known to exist locally
 636          * or is already in the request queue
 637          */
 638         if (remote_dir_exists[obj->oid.hash[0]] == -1)
 639                 get_remote_object_list(obj->oid.hash[0]);
 640         if (obj->flags & (LOCAL | FETCHING))
 641                 return;
 642
 643         obj->flags |= FETCHING;
 644         request = xmalloc(sizeof(*request));
 645         request->obj = obj;
 646         request->url = NULL;
 647         request->lock = NULL;
 648         request->headers = NULL;
 649         request->state = NEED_FETCH;
 650         request->next = request_queue_head;
 651         request_queue_head = request;
 652
 653 #ifdef USE_CURL_MULTI
 654         fill_active_slots();
 655         step_active_slots();
 656 #endif
 657 }
 658
 659 static int add_send_request(struct object *obj, struct remote_lock *lock)
 660 {
 661         struct transfer_request *request;
 662         struct packed_git *target;
 663
 664         /* Keep locks active */
 665         check_locks();
 666
 667         /*
 668          * Don't push the object if it's known to exist on the remote
 669          * or is already in the request queue
 670          */
 671         if (remote_dir_exists[obj->oid.hash[0]] == -1)
 672                 get_remote_object_list(obj->oid.hash[0]);
 673         if (obj->flags & (REMOTE | PUSHING))
 674                 return 0;
 675         target = find_sha1_pack(obj->oid.hash, repo->packs);
 676         if (target) {
 677                 obj->flags |= REMOTE;
 678                 return 0;
 679         }
 680
 681         obj->flags |= PUSHING;
 682         request = xmalloc(sizeof(*request));
 683         request->obj = obj;
 684         request->url = NULL;
 685         request->lock = lock;
 686         request->headers = NULL;
 687         request->state = NEED_PUSH;
 688         request->next = request_queue_head;
 689         request_queue_head = request;
 690
 691 #ifdef USE_CURL_MULTI
 692         fill_active_slots();
 693         step_active_slots();
 694 #endif
 695
 696         return 1;
 697 }
 698
 699 static int fetch_indices(void)
 700 {
 701         int ret;
 702
 703         if (push_verbosely)
 704                 fprintf(stderr, "Getting pack list\n");
 705
 706         switch (http_get_info_packs(repo->url, &repo->packs)) {
 707         case HTTP_OK:
 708         case HTTP_MISSING_TARGET:
 709                 ret = 0;
 710                 break;
 711         default:
 712                 ret = -1;
 713         }
 714
 715         return ret;
 716 }
 717
 718 static void one_remote_object(const struct object_id *oid)
 719 {
 720         struct object *obj;
 721
 722         obj = lookup_object(oid->hash);
 723         if (!obj)
 724                 obj = parse_object(oid);
 725
 726         /* Ignore remote objects that don't exist locally */
 727         if (!obj)
 728                 return;
 729
 730         obj->flags |= REMOTE;
 731         if (!object_list_contains(objects, obj))
 732                 object_list_insert(obj, &objects);
 733 }
 734
 735 static void handle_lockprop_ctx(struct xml_ctx *ctx, int tag_closed)
 736 {
 737         int *lock_flags = (int *)ctx->userData;
 738
 739         if (tag_closed) {
 740                 if (!strcmp(ctx->name, DAV_CTX_LOCKENTRY)) {
 741                         if ((*lock_flags & DAV_PROP_LOCKEX) &&
 742                             (*lock_flags & DAV_PROP_LOCKWR)) {
 743                                 *lock_flags |= DAV_LOCK_OK;
 744                         }
 745                         *lock_flags &= DAV_LOCK_OK;
 746                 } else if (!strcmp(ctx->name, DAV_CTX_LOCKTYPE_WRITE)) {
 747                         *lock_flags |= DAV_PROP_LOCKWR;
 748                 } else if (!strcmp(ctx->name, DAV_CTX_LOCKTYPE_EXCLUSIVE)) {
 749                         *lock_flags |= DAV_PROP_LOCKEX;
 750                 }
 751         }
 752 }
 753
 754 static void handle_new_lock_ctx(struct xml_ctx *ctx, int tag_closed)
 755 {
 756         struct remote_lock *lock = (struct remote_lock *)ctx->userData;
 757         git_SHA_CTX sha_ctx;
 758         unsigned char lock_token_sha1[20];
 759
 760         if (tag_closed && ctx->cdata) {
 761                 if (!strcmp(ctx->name, DAV_ACTIVELOCK_OWNER)) {
 762                         lock->owner = xstrdup(ctx->cdata);
 763                 } else if (!strcmp(ctx->name, DAV_ACTIVELOCK_TIMEOUT)) {
 764                         const char *arg;
 765                         if (skip_prefix(ctx->cdata, "Second-", &arg))
 766                                 lock->timeout = strtol(arg, NULL, 10);
 767                 } else if (!strcmp(ctx->name, DAV_ACTIVELOCK_TOKEN)) {
 768                         lock->token = xstrdup(ctx->cdata);
 769
 770                         git_SHA1_Init(&sha_ctx);
 771                         git_SHA1_Update(&sha_ctx, lock->token, strlen(lock->token));
 772                         git_SHA1_Final(lock_token_sha1, &sha_ctx);
 773
 774                         lock->tmpfile_suffix[0] = '_';
 775                         memcpy(lock->tmpfile_suffix + 1, sha1_to_hex(lock_token_sha1), 40);
 776                 }
 777         }
 778 }
 779
 780 static void one_remote_ref(const char *refname);
 781
 782 static void
 783 xml_start_tag(void *userData, const char *name, const char **atts)
 784 {
 785         struct xml_ctx *ctx = (struct xml_ctx *)userData;
 786         const char *c = strchr(name, ':');
 787         int old_namelen, new_len;
 788
 789         if (c == NULL)
 790                 c = name;
 791         else
 792                 c++;
 793
 794         old_namelen = strlen(ctx->name);
 795         new_len = old_namelen + strlen(c) + 2;
 796
 797         if (new_len > ctx->len) {
 798                 ctx->name = xrealloc(ctx->name, new_len);
 799                 ctx->len = new_len;
 800         }
 801         xsnprintf(ctx->name + old_namelen, ctx->len - old_namelen, ".%s", c);
 802
 803         FREE_AND_NULL(ctx->cdata);
 804
 805         ctx->userFunc(ctx, 0);
 806 }
 807
 808 static void
 809 xml_end_tag(void *userData, const char *name)
 810 {
 811         struct xml_ctx *ctx = (struct xml_ctx *)userData;
 812         const char *c = strchr(name, ':');
 813         char *ep;
 814
 815         ctx->userFunc(ctx, 1);
 816
 817         if (c == NULL)
 818                 c = name;
 819         else
 820                 c++;
 821
 822         ep = ctx->name + strlen(ctx->name) - strlen(c) - 1;
 823         *ep = 0;
 824 }
 825
 826 static void
 827 xml_cdata(void *userData, const XML_Char *s, int len)
 828 {
 829         struct xml_ctx *ctx = (struct xml_ctx *)userData;
 830         free(ctx->cdata);
 831         ctx->cdata = xmemdupz(s, len);
 832 }
 833
 834 static struct remote_lock *lock_remote(const char *path, long timeout)
 835 {
 836         struct active_request_slot *slot;
 837         struct slot_results results;
 838         struct buffer out_buffer = { STRBUF_INIT, 0 };
 839         struct strbuf in_buffer = STRBUF_INIT;
 840         char *url;
 841         char *ep;
 842         char timeout_header[25];
 843         struct remote_lock *lock = NULL;
 844         struct curl_slist *dav_headers = http_copy_default_headers();
 845         struct xml_ctx ctx;
 846         char *escaped;
 847
 848         url = xstrfmt("%s%s", repo->url, path);
 849
 850         /* Make sure leading directories exist for the remote ref */
 851         ep = strchr(url + strlen(repo->url) + 1, '/');
 852         while (ep) {
 853                 char saved_character = ep[1];
 854                 ep[1] = '\0';
 855                 slot = get_active_slot();
 856                 slot->results = &results;
 857                 curl_setup_http_get(slot->curl, url, DAV_MKCOL);
 858                 if (start_active_slot(slot)) {
 859                         run_active_slot(slot);
 860                         if (results.curl_result != CURLE_OK &&
 861                             results.http_code != 405) {
 862                                 fprintf(stderr,
 863                                         "Unable to create branch path %s\n",
 864                                         url);
 865                                 free(url);
 866                                 return NULL;
 867                         }
 868                 } else {
 869                         fprintf(stderr, "Unable to start MKCOL request\n");
 870                         free(url);
 871                         return NULL;
 872                 }
 873                 ep[1] = saved_character;
 874                 ep = strchr(ep + 1, '/');
 875         }
 876
 877         escaped = xml_entities(ident_default_email());
 878         strbuf_addf(&out_buffer.buf, LOCK_REQUEST, escaped);
 879         free(escaped);
 880
 881         xsnprintf(timeout_header, sizeof(timeout_header), "Timeout: Second-%ld", timeout);
 882         dav_headers = curl_slist_append(dav_headers, timeout_header);
 883         dav_headers = curl_slist_append(dav_headers, "Content-Type: text/xml");
 884
 885         slot = get_active_slot();
 886         slot->results = &results;
 887         curl_setup_http(slot->curl, url, DAV_LOCK, &out_buffer, fwrite_buffer);
 888         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
 889         curl_easy_setopt(slot->curl, CURLOPT_FILE, &in_buffer);
 890
 891         lock = xcalloc(1, sizeof(*lock));
 892         lock->timeout = -1;
 893
 894         if (start_active_slot(slot)) {
 895                 run_active_slot(slot);
 896                 if (results.curl_result == CURLE_OK) {
 897                         XML_Parser parser = XML_ParserCreate(NULL);
 898                         enum XML_Status result;
 899                         ctx.name = xcalloc(10, 1);
 900                         ctx.len = 0;
 901                         ctx.cdata = NULL;
 902                         ctx.userFunc = handle_new_lock_ctx;
 903                         ctx.userData = lock;
 904                         XML_SetUserData(parser, &ctx);
 905                         XML_SetElementHandler(parser, xml_start_tag,
 906                                               xml_end_tag);
 907                         XML_SetCharacterDataHandler(parser, xml_cdata);
 908                         result = XML_Parse(parser, in_buffer.buf,
 909                                            in_buffer.len, 1);
 910                         free(ctx.name);
 911                         if (result != XML_STATUS_OK) {
 912                                 fprintf(stderr, "XML error: %s\n",
 913                                         XML_ErrorString(
 914                                                 XML_GetErrorCode(parser)));
 915                                 lock->timeout = -1;
 916                         }
 917                         XML_ParserFree(parser);
 918                 }
 919         } else {
 920                 fprintf(stderr, "Unable to start LOCK request\n");
 921         }
 922
 923         curl_slist_free_all(dav_headers);
 924         strbuf_release(&out_buffer.buf);
 925         strbuf_release(&in_buffer);
 926
 927         if (lock->token == NULL || lock->timeout <= 0) {
 928                 free(lock->token);
 929                 free(lock->owner);
 930                 free(url);
 931                 FREE_AND_NULL(lock);
 932         } else {
 933                 lock->url = url;
 934                 lock->start_time = time(NULL);
 935                 lock->next = repo->locks;
 936                 repo->locks = lock;
 937         }
 938
 939         return lock;
 940 }
 941
 942 static int unlock_remote(struct remote_lock *lock)
 943 {
 944         struct active_request_slot *slot;
 945         struct slot_results results;
 946         struct remote_lock *prev = repo->locks;
 947         struct curl_slist *dav_headers;
 948         int rc = 0;
 949
 950         dav_headers = get_dav_token_headers(lock, DAV_HEADER_LOCK);
 951
 952         slot = get_active_slot();
 953         slot->results = &results;
 954         curl_setup_http_get(slot->curl, lock->url, DAV_UNLOCK);
 955         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
 956
 957         if (start_active_slot(slot)) {
 958                 run_active_slot(slot);
 959                 if (results.curl_result == CURLE_OK)
 960                         rc = 1;
 961                 else
 962                         fprintf(stderr, "UNLOCK HTTP error %ld\n",
 963                                 results.http_code);
 964         } else {
 965                 fprintf(stderr, "Unable to start UNLOCK request\n");
 966         }
 967
 968         curl_slist_free_all(dav_headers);
 969
 970         if (repo->locks == lock) {
 971                 repo->locks = lock->next;
 972         } else {
 973                 while (prev && prev->next != lock)
 974                         prev = prev->next;
 975                 if (prev)
 976                         prev->next = prev->next->next;
 977         }
 978
 979         free(lock->owner);
 980         free(lock->url);
 981         free(lock->token);
 982         free(lock);
 983
 984         return rc;
 985 }
 986
 987 static void remove_locks(void)
 988 {
 989         struct remote_lock *lock = repo->locks;
 990
 991         fprintf(stderr, "Removing remote locks...\n");
 992         while (lock) {
 993                 struct remote_lock *next = lock->next;
 994                 unlock_remote(lock);
 995                 lock = next;
 996         }
 997 }
 998
 999 static void remove_locks_on_signal(int signo)
1000 {
1001         remove_locks();
1002         sigchain_pop(signo);
1003         raise(signo);
1004 }
1005
1006 static void remote_ls(const char *path, int flags,
1007                       void (*userFunc)(struct remote_ls_ctx *ls),
1008                       void *userData);
1009
1010 /* extract hex from sharded "xx/x{40}" filename */
1011 static int get_oid_hex_from_objpath(const char *path, struct object_id *oid)
1012 {
1013         char hex[GIT_MAX_HEXSZ];
1014
1015         if (strlen(path) != GIT_SHA1_HEXSZ + 1)
1016                 return -1;
1017
1018         memcpy(hex, path, 2);
1019         path += 2;
1020         path++; /* skip '/' */
1021         memcpy(hex, path, GIT_SHA1_HEXSZ - 2);
1022
1023         return get_oid_hex(hex, oid);
1024 }
1025
1026 static void process_ls_object(struct remote_ls_ctx *ls)
1027 {
1028         unsigned int *parent = (unsigned int *)ls->userData;
1029         const char *path = ls->dentry_name;
1030         struct object_id oid;
1031
1032         if (!strcmp(ls->path, ls->dentry_name) && (ls->flags & IS_DIR)) {
1033                 remote_dir_exists[*parent] = 1;
1034                 return;
1035         }
1036
1037         if (!skip_prefix(path, "objects/", &path) ||
1038             get_oid_hex_from_objpath(path, &oid))
1039                 return;
1040
1041         one_remote_object(&oid);
1042 }
1043
1044 static void process_ls_ref(struct remote_ls_ctx *ls)
1045 {
1046         if (!strcmp(ls->path, ls->dentry_name) && (ls->dentry_flags & IS_DIR)) {
1047                 fprintf(stderr, "  %s\n", ls->dentry_name);
1048                 return;
1049         }
1050
1051         if (!(ls->dentry_flags & IS_DIR))
1052                 one_remote_ref(ls->dentry_name);
1053 }
1054
1055 static void handle_remote_ls_ctx(struct xml_ctx *ctx, int tag_closed)
1056 {
1057         struct remote_ls_ctx *ls = (struct remote_ls_ctx *)ctx->userData;
1058
1059         if (tag_closed) {
1060                 if (!strcmp(ctx->name, DAV_PROPFIND_RESP) && ls->dentry_name) {
1061                         if (ls->dentry_flags & IS_DIR) {
1062
1063                                 /* ensure collection names end with slash */
1064                                 str_end_url_with_slash(ls->dentry_name, &ls->dentry_name);
1065
1066                                 if (ls->flags & PROCESS_DIRS) {
1067                                         ls->userFunc(ls);
1068                                 }
1069                                 if (strcmp(ls->dentry_name, ls->path) &&
1070                                     ls->flags & RECURSIVE) {
1071                                         remote_ls(ls->dentry_name,
1072                                                   ls->flags,
1073                                                   ls->userFunc,
1074                                                   ls->userData);
1075                                 }
1076                         } else if (ls->flags & PROCESS_FILES) {
1077                                 ls->userFunc(ls);
1078                         }
1079                 } else if (!strcmp(ctx->name, DAV_PROPFIND_NAME) && ctx->cdata) {
1080                         char *path = ctx->cdata;
1081                         if (*ctx->cdata == 'h') {
1082                                 path = strstr(path, "//");
1083                                 if (path) {
1084                                         path = strchr(path+2, '/');
1085                                 }
1086                         }
1087                         if (path) {
1088                                 const char *url = repo->url;
1089                                 if (repo->path)
1090                                         url = repo->path;
1091                                 if (strncmp(path, url, repo->path_len))
1092                                         error("Parsed path '%s' does not match url: '%s'",
1093                                               path, url);
1094                                 else {
1095                                         path += repo->path_len;
1096                                         ls->dentry_name = xstrdup(path);
1097                                 }
1098                         }
1099                 } else if (!strcmp(ctx->name, DAV_PROPFIND_COLLECTION)) {
1100                         ls->dentry_flags |= IS_DIR;
1101                 }
1102         } else if (!strcmp(ctx->name, DAV_PROPFIND_RESP)) {
1103                 FREE_AND_NULL(ls->dentry_name);
1104                 ls->dentry_flags = 0;
1105         }
1106 }
1107
1108 /*
1109  * NEEDSWORK: remote_ls() ignores info/refs on the remote side.  But it
1110  * should _only_ heed the information from that file, instead of trying to
1111  * determine the refs from the remote file system (badly: it does not even
1112  * know about packed-refs).
1113  */
1114 static void remote_ls(const char *path, int flags,
1115                       void (*userFunc)(struct remote_ls_ctx *ls),
1116                       void *userData)
1117 {
1118         char *url = xstrfmt("%s%s", repo->url, path);
1119         struct active_request_slot *slot;
1120         struct slot_results results;
1121         struct strbuf in_buffer = STRBUF_INIT;
1122         struct buffer out_buffer = { STRBUF_INIT, 0 };
1123         struct curl_slist *dav_headers = http_copy_default_headers();
1124         struct xml_ctx ctx;
1125         struct remote_ls_ctx ls;
1126
1127         ls.flags = flags;
1128         ls.path = xstrdup(path);
1129         ls.dentry_name = NULL;
1130         ls.dentry_flags = 0;
1131         ls.userData = userData;
1132         ls.userFunc = userFunc;
1133
1134         strbuf_addstr(&out_buffer.buf, PROPFIND_ALL_REQUEST);
1135
1136         dav_headers = curl_slist_append(dav_headers, "Depth: 1");
1137         dav_headers = curl_slist_append(dav_headers, "Content-Type: text/xml");
1138
1139         slot = get_active_slot();
1140         slot->results = &results;
1141         curl_setup_http(slot->curl, url, DAV_PROPFIND,
1142                         &out_buffer, fwrite_buffer);
1143         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
1144         curl_easy_setopt(slot->curl, CURLOPT_FILE, &in_buffer);
1145
1146         if (start_active_slot(slot)) {
1147                 run_active_slot(slot);
1148                 if (results.curl_result == CURLE_OK) {
1149                         XML_Parser parser = XML_ParserCreate(NULL);
1150                         enum XML_Status result;
1151                         ctx.name = xcalloc(10, 1);
1152                         ctx.len = 0;
1153                         ctx.cdata = NULL;
1154                         ctx.userFunc = handle_remote_ls_ctx;
1155                         ctx.userData = &ls;
1156                         XML_SetUserData(parser, &ctx);
1157                         XML_SetElementHandler(parser, xml_start_tag,
1158                                               xml_end_tag);
1159                         XML_SetCharacterDataHandler(parser, xml_cdata);
1160                         result = XML_Parse(parser, in_buffer.buf,
1161                                            in_buffer.len, 1);
1162                         free(ctx.name);
1163
1164                         if (result != XML_STATUS_OK) {
1165                                 fprintf(stderr, "XML error: %s\n",
1166                                         XML_ErrorString(
1167                                                 XML_GetErrorCode(parser)));
1168                         }
1169                         XML_ParserFree(parser);
1170                 }
1171         } else {
1172                 fprintf(stderr, "Unable to start PROPFIND request\n");
1173         }
1174
1175         free(ls.path);
1176         free(url);
1177         strbuf_release(&out_buffer.buf);
1178         strbuf_release(&in_buffer);
1179         curl_slist_free_all(dav_headers);
1180 }
1181
1182 static void get_remote_object_list(unsigned char parent)
1183 {
1184         char path[] = "objects/XX/";
1185         static const char hex[] = "0123456789abcdef";
1186         unsigned int val = parent;
1187
1188         path[8] = hex[val >> 4];
1189         path[9] = hex[val & 0xf];
1190         remote_dir_exists[val] = 0;
1191         remote_ls(path, (PROCESS_FILES | PROCESS_DIRS),
1192                   process_ls_object, &val);
1193 }
1194
1195 static int locking_available(void)
1196 {
1197         struct active_request_slot *slot;
1198         struct slot_results results;
1199         struct strbuf in_buffer = STRBUF_INIT;
1200         struct buffer out_buffer = { STRBUF_INIT, 0 };
1201         struct curl_slist *dav_headers = http_copy_default_headers();
1202         struct xml_ctx ctx;
1203         int lock_flags = 0;
1204         char *escaped;
1205
1206         escaped = xml_entities(repo->url);
1207         strbuf_addf(&out_buffer.buf, PROPFIND_SUPPORTEDLOCK_REQUEST, escaped);
1208         free(escaped);
1209
1210         dav_headers = curl_slist_append(dav_headers, "Depth: 0");
1211         dav_headers = curl_slist_append(dav_headers, "Content-Type: text/xml");
1212
1213         slot = get_active_slot();
1214         slot->results = &results;
1215         curl_setup_http(slot->curl, repo->url, DAV_PROPFIND,
1216                         &out_buffer, fwrite_buffer);
1217         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
1218         curl_easy_setopt(slot->curl, CURLOPT_FILE, &in_buffer);
1219
1220         if (start_active_slot(slot)) {
1221                 run_active_slot(slot);
1222                 if (results.curl_result == CURLE_OK) {
1223                         XML_Parser parser = XML_ParserCreate(NULL);
1224                         enum XML_Status result;
1225                         ctx.name = xcalloc(10, 1);
1226                         ctx.len = 0;
1227                         ctx.cdata = NULL;
1228                         ctx.userFunc = handle_lockprop_ctx;
1229                         ctx.userData = &lock_flags;
1230                         XML_SetUserData(parser, &ctx);
1231                         XML_SetElementHandler(parser, xml_start_tag,
1232                                               xml_end_tag);
1233                         result = XML_Parse(parser, in_buffer.buf,
1234                                            in_buffer.len, 1);
1235                         free(ctx.name);
1236
1237                         if (result != XML_STATUS_OK) {
1238                                 fprintf(stderr, "XML error: %s\n",
1239                                         XML_ErrorString(
1240                                                 XML_GetErrorCode(parser)));
1241                                 lock_flags = 0;
1242                         }
1243                         XML_ParserFree(parser);
1244                         if (!lock_flags)
1245                                 error("no DAV locking support on %s",
1246                                       repo->url);
1247
1248                 } else {
1249                         error("Cannot access URL %s, return code %d",
1250                               repo->url, results.curl_result);
1251                         lock_flags = 0;
1252                 }
1253         } else {
1254                 error("Unable to start PROPFIND request on %s", repo->url);
1255         }
1256
1257         strbuf_release(&out_buffer.buf);
1258         strbuf_release(&in_buffer);
1259         curl_slist_free_all(dav_headers);
1260
1261         return lock_flags;
1262 }
1263
1264 static struct object_list **add_one_object(struct object *obj, struct object_list **p)
1265 {
1266         struct object_list *entry = xmalloc(sizeof(struct object_list));
1267         entry->item = obj;
1268         entry->next = *p;
1269         *p = entry;
1270         return &entry->next;
1271 }
1272
1273 static struct object_list **process_blob(struct blob *blob,
1274                                          struct object_list **p)
1275 {
1276         struct object *obj = &blob->object;
1277
1278         obj->flags |= LOCAL;
1279
1280         if (obj->flags & (UNINTERESTING | SEEN))
1281                 return p;
1282
1283         obj->flags |= SEEN;
1284         return add_one_object(obj, p);
1285 }
1286
1287 static struct object_list **process_tree(struct tree *tree,
1288                                          struct object_list **p)
1289 {
1290         struct object *obj = &tree->object;
1291         struct tree_desc desc;
1292         struct name_entry entry;
1293
1294         obj->flags |= LOCAL;
1295
1296         if (obj->flags & (UNINTERESTING | SEEN))
1297                 return p;
1298         if (parse_tree(tree) < 0)
1299                 die("bad tree object %s", oid_to_hex(&obj->oid));
1300
1301         obj->flags |= SEEN;
1302         p = add_one_object(obj, p);
1303
1304         init_tree_desc(&desc, tree->buffer, tree->size);
1305
1306         while (tree_entry(&desc, &entry))
1307                 switch (object_type(entry.mode)) {
1308                 case OBJ_TREE:
1309                         p = process_tree(lookup_tree(entry.oid), p);
1310                         break;
1311                 case OBJ_BLOB:
1312                         p = process_blob(lookup_blob(entry.oid), p);
1313                         break;
1314                 default:
1315                         /* Subproject commit - not in this repository */
1316                         break;
1317                 }
1318
1319         free_tree_buffer(tree);
1320         return p;
1321 }
1322
1323 static int get_delta(struct rev_info *revs, struct remote_lock *lock)
1324 {
1325         int i;
1326         struct commit *commit;
1327         struct object_list **p = &objects;
1328         int count = 0;
1329
1330         while ((commit = get_revision(revs)) != NULL) {
1331                 p = process_tree(commit->tree, p);
1332                 commit->object.flags |= LOCAL;
1333                 if (!(commit->object.flags & UNINTERESTING))
1334                         count += add_send_request(&commit->object, lock);
1335         }
1336
1337         for (i = 0; i < revs->pending.nr; i++) {
1338                 struct object_array_entry *entry = revs->pending.objects + i;
1339                 struct object *obj = entry->item;
1340                 const char *name = entry->name;
1341
1342                 if (obj->flags & (UNINTERESTING | SEEN))
1343                         continue;
1344                 if (obj->type == OBJ_TAG) {
1345                         obj->flags |= SEEN;
1346                         p = add_one_object(obj, p);
1347                         continue;
1348                 }
1349                 if (obj->type == OBJ_TREE) {
1350                         p = process_tree((struct tree *)obj, p);
1351                         continue;
1352                 }
1353                 if (obj->type == OBJ_BLOB) {
1354                         p = process_blob((struct blob *)obj, p);
1355                         continue;
1356                 }
1357                 die("unknown pending object %s (%s)", oid_to_hex(&obj->oid), name);
1358         }
1359
1360         while (objects) {
1361                 if (!(objects->item->flags & UNINTERESTING))
1362                         count += add_send_request(objects->item, lock);
1363                 objects = objects->next;
1364         }
1365
1366         return count;
1367 }
1368
1369 static int update_remote(unsigned char *sha1, struct remote_lock *lock)
1370 {
1371         struct active_request_slot *slot;
1372         struct slot_results results;
1373         struct buffer out_buffer = { STRBUF_INIT, 0 };
1374         struct curl_slist *dav_headers;
1375
1376         dav_headers = get_dav_token_headers(lock, DAV_HEADER_IF);
1377
1378         strbuf_addf(&out_buffer.buf, "%s\n", sha1_to_hex(sha1));
1379
1380         slot = get_active_slot();
1381         slot->results = &results;
1382         curl_setup_http(slot->curl, lock->url, DAV_PUT,
1383                         &out_buffer, fwrite_null);
1384         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
1385
1386         if (start_active_slot(slot)) {
1387                 run_active_slot(slot);
1388                 strbuf_release(&out_buffer.buf);
1389                 if (results.curl_result != CURLE_OK) {
1390                         fprintf(stderr,
1391                                 "PUT error: curl result=%d, HTTP code=%ld\n",
1392                                 results.curl_result, results.http_code);
1393                         /* We should attempt recovery? */
1394                         return 0;
1395                 }
1396         } else {
1397                 strbuf_release(&out_buffer.buf);
1398                 fprintf(stderr, "Unable to start PUT request\n");
1399                 return 0;
1400         }
1401
1402         return 1;
1403 }
1404
1405 static struct ref *remote_refs;
1406
1407 static void one_remote_ref(const char *refname)
1408 {
1409         struct ref *ref;
1410         struct object *obj;
1411
1412         ref = alloc_ref(refname);
1413
1414         if (http_fetch_ref(repo->url, ref) != 0) {
1415                 fprintf(stderr,
1416                         "Unable to fetch ref %s from %s\n",
1417                         refname, repo->url);
1418                 free(ref);
1419                 return;
1420         }
1421
1422         /*
1423          * Fetch a copy of the object if it doesn't exist locally - it
1424          * may be required for updating server info later.
1425          */
1426         if (repo->can_update_info_refs && !has_object_file(&ref->old_oid)) {
1427                 obj = lookup_unknown_object(ref->old_oid.hash);
1428                 fprintf(stderr, "  fetch %s for %s\n",
1429                         oid_to_hex(&ref->old_oid), refname);
1430                 add_fetch_request(obj);
1431         }
1432
1433         ref->next = remote_refs;
1434         remote_refs = ref;
1435 }
1436
1437 static void get_dav_remote_heads(void)
1438 {
1439         remote_ls("refs/", (PROCESS_FILES | PROCESS_DIRS | RECURSIVE), process_ls_ref, NULL);
1440 }
1441
1442 static void add_remote_info_ref(struct remote_ls_ctx *ls)
1443 {
1444         struct strbuf *buf = (struct strbuf *)ls->userData;
1445         struct object *o;
1446         struct ref *ref;
1447
1448         ref = alloc_ref(ls->dentry_name);
1449
1450         if (http_fetch_ref(repo->url, ref) != 0) {
1451                 fprintf(stderr,
1452                         "Unable to fetch ref %s from %s\n",
1453                         ls->dentry_name, repo->url);
1454                 aborted = 1;
1455                 free(ref);
1456                 return;
1457         }
1458
1459         o = parse_object(&ref->old_oid);
1460         if (!o) {
1461                 fprintf(stderr,
1462                         "Unable to parse object %s for remote ref %s\n",
1463                         oid_to_hex(&ref->old_oid), ls->dentry_name);
1464                 aborted = 1;
1465                 free(ref);
1466                 return;
1467         }
1468
1469         strbuf_addf(buf, "%s\t%s\n",
1470                     oid_to_hex(&ref->old_oid), ls->dentry_name);
1471
1472         if (o->type == OBJ_TAG) {
1473                 o = deref_tag(o, ls->dentry_name, 0);
1474                 if (o)
1475                         strbuf_addf(buf, "%s\t%s^{}\n",
1476                                     oid_to_hex(&o->oid), ls->dentry_name);
1477         }
1478         free(ref);
1479 }
1480
1481 static void update_remote_info_refs(struct remote_lock *lock)
1482 {
1483         struct buffer buffer = { STRBUF_INIT, 0 };
1484         struct active_request_slot *slot;
1485         struct slot_results results;
1486         struct curl_slist *dav_headers;
1487
1488         remote_ls("refs/", (PROCESS_FILES | RECURSIVE),
1489                   add_remote_info_ref, &buffer.buf);
1490         if (!aborted) {
1491                 dav_headers = get_dav_token_headers(lock, DAV_HEADER_IF);
1492
1493                 slot = get_active_slot();
1494                 slot->results = &results;
1495                 curl_setup_http(slot->curl, lock->url, DAV_PUT,
1496                                 &buffer, fwrite_null);
1497                 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
1498
1499                 if (start_active_slot(slot)) {
1500                         run_active_slot(slot);
1501                         if (results.curl_result != CURLE_OK) {
1502                                 fprintf(stderr,
1503                                         "PUT error: curl result=%d, HTTP code=%ld\n",
1504                                         results.curl_result, results.http_code);
1505                         }
1506                 }
1507         }
1508         strbuf_release(&buffer.buf);
1509 }
1510
1511 static int remote_exists(const char *path)
1512 {
1513         char *url = xstrfmt("%s%s", repo->url, path);
1514         int ret;
1515
1516
1517         switch (http_get_strbuf(url, NULL, NULL)) {
1518         case HTTP_OK:
1519                 ret = 1;
1520                 break;
1521         case HTTP_MISSING_TARGET:
1522                 ret = 0;
1523                 break;
1524         case HTTP_ERROR:
1525                 error("unable to access '%s': %s", url, curl_errorstr);
1526         default:
1527                 ret = -1;
1528         }
1529         free(url);
1530         return ret;
1531 }
1532
1533 static void fetch_symref(const char *path, char **symref, struct object_id *oid)
1534 {
1535         char *url = xstrfmt("%s%s", repo->url, path);
1536         struct strbuf buffer = STRBUF_INIT;
1537         const char *name;
1538
1539         if (http_get_strbuf(url, &buffer, NULL) != HTTP_OK)
1540                 die("Couldn't get %s for remote symref\n%s", url,
1541                     curl_errorstr);
1542         free(url);
1543
1544         FREE_AND_NULL(*symref);
1545         oidclr(oid);
1546
1547         if (buffer.len == 0)
1548                 return;
1549
1550         /* Cut off trailing newline. */
1551         strbuf_rtrim(&buffer);
1552
1553         /* If it's a symref, set the refname; otherwise try for a sha1 */
1554         if (skip_prefix(buffer.buf, "ref: ", &name)) {
1555                 *symref = xmemdupz(name, buffer.len - (name - buffer.buf));
1556         } else {
1557                 get_oid_hex(buffer.buf, oid);
1558         }
1559
1560         strbuf_release(&buffer);
1561 }
1562
1563 static int verify_merge_base(struct object_id *head_oid, struct ref *remote)
1564 {
1565         struct commit *head = lookup_commit_or_die(head_oid, "HEAD");
1566         struct commit *branch = lookup_commit_or_die(&remote->old_oid,
1567                                                      remote->name);
1568
1569         return in_merge_bases(branch, head);
1570 }
1571
1572 static int delete_remote_branch(const char *pattern, int force)
1573 {
1574         struct ref *refs = remote_refs;
1575         struct ref *remote_ref = NULL;
1576         struct object_id head_oid;
1577         char *symref = NULL;
1578         int match;
1579         int patlen = strlen(pattern);
1580         int i;
1581         struct active_request_slot *slot;
1582         struct slot_results results;
1583         char *url;
1584
1585         /* Find the remote branch(es) matching the specified branch name */
1586         for (match = 0; refs; refs = refs->next) {
1587                 char *name = refs->name;
1588                 int namelen = strlen(name);
1589                 if (namelen < patlen ||
1590                     memcmp(name + namelen - patlen, pattern, patlen))
1591                         continue;
1592                 if (namelen != patlen && name[namelen - patlen - 1] != '/')
1593                         continue;
1594                 match++;
1595                 remote_ref = refs;
1596         }
1597         if (match == 0)
1598                 return error("No remote branch matches %s", pattern);
1599         if (match != 1)
1600                 return error("More than one remote branch matches %s",
1601                              pattern);
1602
1603         /*
1604          * Remote HEAD must be a symref (not exactly foolproof; a remote
1605          * symlink to a symref will look like a symref)
1606          */
1607         fetch_symref("HEAD", &symref, &head_oid);
1608         if (!symref)
1609                 return error("Remote HEAD is not a symref");
1610
1611         /* Remote branch must not be the remote HEAD */
1612         for (i = 0; symref && i < MAXDEPTH; i++) {
1613                 if (!strcmp(remote_ref->name, symref))
1614                         return error("Remote branch %s is the current HEAD",
1615                                      remote_ref->name);
1616                 fetch_symref(symref, &symref, &head_oid);
1617         }
1618
1619         /* Run extra sanity checks if delete is not forced */
1620         if (!force) {
1621                 /* Remote HEAD must resolve to a known object */
1622                 if (symref)
1623                         return error("Remote HEAD symrefs too deep");
1624                 if (is_null_oid(&head_oid))
1625                         return error("Unable to resolve remote HEAD");
1626                 if (!has_object_file(&head_oid))
1627                         return error("Remote HEAD resolves to object %s\nwhich does not exist locally, perhaps you need to fetch?", oid_to_hex(&head_oid));
1628
1629                 /* Remote branch must resolve to a known object */
1630                 if (is_null_oid(&remote_ref->old_oid))
1631                         return error("Unable to resolve remote branch %s",
1632                                      remote_ref->name);
1633                 if (!has_object_file(&remote_ref->old_oid))
1634                         return error("Remote branch %s resolves to object %s\nwhich does not exist locally, perhaps you need to fetch?", remote_ref->name, oid_to_hex(&remote_ref->old_oid));
1635
1636                 /* Remote branch must be an ancestor of remote HEAD */
1637                 if (!verify_merge_base(&head_oid, remote_ref)) {
1638                         return error("The branch '%s' is not an ancestor "
1639                                      "of your current HEAD.\n"
1640                                      "If you are sure you want to delete it,"
1641                                      " run:\n\t'git http-push -D %s %s'",
1642                                      remote_ref->name, repo->url, pattern);
1643                 }
1644         }
1645
1646         /* Send delete request */
1647         fprintf(stderr, "Removing remote branch '%s'\n", remote_ref->name);
1648         if (dry_run)
1649                 return 0;
1650         url = xstrfmt("%s%s", repo->url, remote_ref->name);
1651         slot = get_active_slot();
1652         slot->results = &results;
1653         curl_setup_http_get(slot->curl, url, DAV_DELETE);
1654         if (start_active_slot(slot)) {
1655                 run_active_slot(slot);
1656                 free(url);
1657                 if (results.curl_result != CURLE_OK)
1658                         return error("DELETE request failed (%d/%ld)",
1659                                      results.curl_result, results.http_code);
1660         } else {
1661                 free(url);
1662                 return error("Unable to start DELETE request");
1663         }
1664
1665         return 0;
1666 }
1667
1668 static void run_request_queue(void)
1669 {
1670 #ifdef USE_CURL_MULTI
1671         is_running_queue = 1;
1672         fill_active_slots();
1673         add_fill_function(NULL, fill_active_slot);
1674 #endif
1675         do {
1676                 finish_all_active_slots();
1677 #ifdef USE_CURL_MULTI
1678                 fill_active_slots();
1679 #endif
1680         } while (request_queue_head && !aborted);
1681
1682 #ifdef USE_CURL_MULTI
1683         is_running_queue = 0;
1684 #endif
1685 }
1686
1687 int cmd_main(int argc, const char **argv)
1688 {
1689         struct transfer_request *request;
1690         struct transfer_request *next_request;
1691         int nr_refspec = 0;
1692         const char **refspec = NULL;
1693         struct remote_lock *ref_lock = NULL;
1694         struct remote_lock *info_ref_lock = NULL;
1695         struct rev_info revs;
1696         int delete_branch = 0;
1697         int force_delete = 0;
1698         int objects_to_send;
1699         int rc = 0;
1700         int i;
1701         int new_refs;
1702         struct ref *ref, *local_refs;
1703
1704         repo = xcalloc(1, sizeof(*repo));
1705
1706         argv++;
1707         for (i = 1; i < argc; i++, argv++) {
1708                 const char *arg = *argv;
1709
1710                 if (*arg == '-') {
1711                         if (!strcmp(arg, "--all")) {
1712                                 push_all = MATCH_REFS_ALL;
1713                                 continue;
1714                         }
1715                         if (!strcmp(arg, "--force")) {
1716                                 force_all = 1;
1717                                 continue;
1718                         }
1719                         if (!strcmp(arg, "--dry-run")) {
1720                                 dry_run = 1;
1721                                 continue;
1722                         }
1723                         if (!strcmp(arg, "--helper-status")) {
1724                                 helper_status = 1;
1725                                 continue;
1726                         }
1727                         if (!strcmp(arg, "--verbose")) {
1728                                 push_verbosely = 1;
1729                                 http_is_verbose = 1;
1730                                 continue;
1731                         }
1732                         if (!strcmp(arg, "-d")) {
1733                                 delete_branch = 1;
1734                                 continue;
1735                         }
1736                         if (!strcmp(arg, "-D")) {
1737                                 delete_branch = 1;
1738                                 force_delete = 1;
1739                                 continue;
1740                         }
1741                         if (!strcmp(arg, "-h"))
1742                                 usage(http_push_usage);
1743                 }
1744                 if (!repo->url) {
1745                         char *path = strstr(arg, "//");
1746                         str_end_url_with_slash(arg, &repo->url);
1747                         repo->path_len = strlen(repo->url);
1748                         if (path) {
1749                                 repo->path = strchr(path+2, '/');
1750                                 if (repo->path)
1751                                         repo->path_len = strlen(repo->path);
1752                         }
1753                         continue;
1754                 }
1755                 refspec = argv;
1756                 nr_refspec = argc - i;
1757                 break;
1758         }
1759
1760 #ifndef USE_CURL_MULTI
1761         die("git-push is not available for http/https repository when not compiled with USE_CURL_MULTI");
1762 #endif
1763
1764         if (!repo->url)
1765                 usage(http_push_usage);
1766
1767         if (delete_branch && nr_refspec != 1)
1768                 die("You must specify only one branch name when deleting a remote branch");
1769
1770         setup_git_directory();
1771
1772         memset(remote_dir_exists, -1, 256);
1773
1774         http_init(NULL, repo->url, 1);
1775
1776 #ifdef USE_CURL_MULTI
1777         is_running_queue = 0;
1778 #endif
1779
1780         /* Verify DAV compliance/lock support */
1781         if (!locking_available()) {
1782                 rc = 1;
1783                 goto cleanup;
1784         }
1785
1786         sigchain_push_common(remove_locks_on_signal);
1787
1788         /* Check whether the remote has server info files */
1789         repo->can_update_info_refs = 0;
1790         repo->has_info_refs = remote_exists("info/refs");
1791         repo->has_info_packs = remote_exists("objects/info/packs");
1792         if (repo->has_info_refs) {
1793                 info_ref_lock = lock_remote("info/refs", LOCK_TIME);
1794                 if (info_ref_lock)
1795                         repo->can_update_info_refs = 1;
1796                 else {
1797                         error("cannot lock existing info/refs");
1798                         rc = 1;
1799                         goto cleanup;
1800                 }
1801         }
1802         if (repo->has_info_packs)
1803                 fetch_indices();
1804
1805         /* Get a list of all local and remote heads to validate refspecs */
1806         local_refs = get_local_heads();
1807         fprintf(stderr, "Fetching remote heads...\n");
1808         get_dav_remote_heads();
1809         run_request_queue();
1810
1811         /* Remove a remote branch if -d or -D was specified */
1812         if (delete_branch) {
1813                 if (delete_remote_branch(refspec[0], force_delete) == -1) {
1814                         fprintf(stderr, "Unable to delete remote branch %s\n",
1815                                 refspec[0]);
1816                         if (helper_status)
1817                                 printf("error %s cannot remove\n", refspec[0]);
1818                 }
1819                 goto cleanup;
1820         }
1821
1822         /* match them up */
1823         if (match_push_refs(local_refs, &remote_refs,
1824                             nr_refspec, (const char **) refspec, push_all)) {
1825                 rc = -1;
1826                 goto cleanup;
1827         }
1828         if (!remote_refs) {
1829                 fprintf(stderr, "No refs in common and none specified; doing nothing.\n");
1830                 if (helper_status)
1831                         printf("error null no match\n");
1832                 rc = 0;
1833                 goto cleanup;
1834         }
1835
1836         new_refs = 0;
1837         for (ref = remote_refs; ref; ref = ref->next) {
1838                 struct argv_array commit_argv = ARGV_ARRAY_INIT;
1839
1840                 if (!ref->peer_ref)
1841                         continue;
1842
1843                 if (is_null_oid(&ref->peer_ref->new_oid)) {
1844                         if (delete_remote_branch(ref->name, 1) == -1) {
1845                                 error("Could not remove %s", ref->name);
1846                                 if (helper_status)
1847                                         printf("error %s cannot remove\n", ref->name);
1848                                 rc = -4;
1849                         }
1850                         else if (helper_status)
1851                                 printf("ok %s\n", ref->name);
1852                         new_refs++;
1853                         continue;
1854                 }
1855
1856                 if (!oidcmp(&ref->old_oid, &ref->peer_ref->new_oid)) {
1857                         if (push_verbosely)
1858                                 fprintf(stderr, "'%s': up-to-date\n", ref->name);
1859                         if (helper_status)
1860                                 printf("ok %s up to date\n", ref->name);
1861                         continue;
1862                 }
1863
1864                 if (!force_all &&
1865                     !is_null_oid(&ref->old_oid) &&
1866                     !ref->force) {
1867                         if (!has_object_file(&ref->old_oid) ||
1868                             !ref_newer(&ref->peer_ref->new_oid,
1869                                        &ref->old_oid)) {
1870                                 /*
1871                                  * We do not have the remote ref, or
1872                                  * we know that the remote ref is not
1873                                  * an ancestor of what we are trying to
1874                                  * push.  Either way this can be losing
1875                                  * commits at the remote end and likely
1876                                  * we were not up to date to begin with.
1877                                  */
1878                                 error("remote '%s' is not an ancestor of\n"
1879                                       "local '%s'.\n"
1880                                       "Maybe you are not up-to-date and "
1881                                       "need to pull first?",
1882                                       ref->name,
1883                                       ref->peer_ref->name);
1884                                 if (helper_status)
1885                                         printf("error %s non-fast forward\n", ref->name);
1886                                 rc = -2;
1887                                 continue;
1888                         }
1889                 }
1890                 oidcpy(&ref->new_oid, &ref->peer_ref->new_oid);
1891                 new_refs++;
1892
1893                 fprintf(stderr, "updating '%s'", ref->name);
1894                 if (strcmp(ref->name, ref->peer_ref->name))
1895                         fprintf(stderr, " using '%s'", ref->peer_ref->name);
1896                 fprintf(stderr, "\n  from %s\n  to   %s\n",
1897                         oid_to_hex(&ref->old_oid), oid_to_hex(&ref->new_oid));
1898                 if (dry_run) {
1899                         if (helper_status)
1900                                 printf("ok %s\n", ref->name);
1901                         continue;
1902                 }
1903
1904                 /* Lock remote branch ref */
1905                 ref_lock = lock_remote(ref->name, LOCK_TIME);
1906                 if (ref_lock == NULL) {
1907                         fprintf(stderr, "Unable to lock remote branch %s\n",
1908                                 ref->name);
1909                         if (helper_status)
1910                                 printf("error %s lock error\n", ref->name);
1911                         rc = 1;
1912                         continue;
1913                 }
1914
1915                 /* Set up revision info for this refspec */
1916                 argv_array_push(&commit_argv, ""); /* ignored */
1917                 argv_array_push(&commit_argv, "--objects");
1918                 argv_array_push(&commit_argv, oid_to_hex(&ref->new_oid));
1919                 if (!push_all && !is_null_oid(&ref->old_oid))
1920                         argv_array_pushf(&commit_argv, "^%s",
1921                                          oid_to_hex(&ref->old_oid));
1922                 init_revisions(&revs, setup_git_directory());
1923                 setup_revisions(commit_argv.argc, commit_argv.argv, &revs, NULL);
1924                 revs.edge_hint = 0; /* just in case */
1925
1926                 /* Generate a list of objects that need to be pushed */
1927                 pushing = 0;
1928                 if (prepare_revision_walk(&revs))
1929                         die("revision walk setup failed");
1930                 mark_edges_uninteresting(&revs, NULL);
1931                 objects_to_send = get_delta(&revs, ref_lock);
1932                 finish_all_active_slots();
1933
1934                 /* Push missing objects to remote, this would be a
1935                    convenient time to pack them first if appropriate. */
1936                 pushing = 1;
1937                 if (objects_to_send)
1938                         fprintf(stderr, "    sending %d objects\n",
1939                                 objects_to_send);
1940
1941                 run_request_queue();
1942
1943                 /* Update the remote branch if all went well */
1944                 if (aborted || !update_remote(ref->new_oid.hash, ref_lock))
1945                         rc = 1;
1946
1947                 if (!rc)
1948                         fprintf(stderr, "    done\n");
1949                 if (helper_status)
1950                         printf("%s %s\n", !rc ? "ok" : "error", ref->name);
1951                 unlock_remote(ref_lock);
1952                 check_locks();
1953                 argv_array_clear(&commit_argv);
1954         }
1955
1956         /* Update remote server info if appropriate */
1957         if (repo->has_info_refs && new_refs) {
1958                 if (info_ref_lock && repo->can_update_info_refs) {
1959                         fprintf(stderr, "Updating remote server info\n");
1960                         if (!dry_run)
1961                                 update_remote_info_refs(info_ref_lock);
1962                 } else {
1963                         fprintf(stderr, "Unable to update server info\n");
1964                 }
1965         }
1966
1967  cleanup:
1968         if (info_ref_lock)
1969                 unlock_remote(info_ref_lock);
1970         free(repo);
1971
1972         http_cleanup();
1973
1974         request = request_queue_head;
1975         while (request != NULL) {
1976                 next_request = request->next;
1977                 release_request(request);
1978                 request = next_request;
1979         }
1980
1981         return rc;
1982 }