http-push.c

   1 #include "cache.h"
   2 #include "repository.h"
   3 #include "commit.h"
   4 #include "tag.h"
   5 #include "blob.h"
   6 #include "http.h"
   7 #include "refs.h"
   8 #include "diff.h"
   9 #include "revision.h"
  10 #include "exec-cmd.h"
  11 #include "remote.h"
  12 #include "list-objects.h"
  13 #include "sigchain.h"
  14 #include "argv-array.h"
  15 #include "packfile.h"
  16 #include "object-store.h"
  17 #include "commit-reach.h"
  18
  19 #ifdef EXPAT_NEEDS_XMLPARSE_H
  20 #include <xmlparse.h>
  21 #else
  22 #include <expat.h>
  23 #endif
  24
  25 static const char http_push_usage[] =
  26 "git http-push [--all] [--dry-run] [--force] [--verbose] <remote> [<head>...]\n";
  27
  28 #ifndef XML_STATUS_OK
  29 enum XML_Status {
  30   XML_STATUS_OK = 1,
  31   XML_STATUS_ERROR = 0
  32 };
  33 #define XML_STATUS_OK    1
  34 #define XML_STATUS_ERROR 0
  35 #endif
  36
  37 #define PREV_BUF_SIZE 4096
  38
  39 /* DAV methods */
  40 #define DAV_LOCK "LOCK"
  41 #define DAV_MKCOL "MKCOL"
  42 #define DAV_MOVE "MOVE"
  43 #define DAV_PROPFIND "PROPFIND"
  44 #define DAV_PUT "PUT"
  45 #define DAV_UNLOCK "UNLOCK"
  46 #define DAV_DELETE "DELETE"
  47
  48 /* DAV lock flags */
  49 #define DAV_PROP_LOCKWR (1u << 0)
  50 #define DAV_PROP_LOCKEX (1u << 1)
  51 #define DAV_LOCK_OK (1u << 2)
  52
  53 /* DAV XML properties */
  54 #define DAV_CTX_LOCKENTRY ".multistatus.response.propstat.prop.supportedlock.lockentry"
  55 #define DAV_CTX_LOCKTYPE_WRITE ".multistatus.response.propstat.prop.supportedlock.lockentry.locktype.write"
  56 #define DAV_CTX_LOCKTYPE_EXCLUSIVE ".multistatus.response.propstat.prop.supportedlock.lockentry.lockscope.exclusive"
  57 #define DAV_ACTIVELOCK_OWNER ".prop.lockdiscovery.activelock.owner.href"
  58 #define DAV_ACTIVELOCK_TIMEOUT ".prop.lockdiscovery.activelock.timeout"
  59 #define DAV_ACTIVELOCK_TOKEN ".prop.lockdiscovery.activelock.locktoken.href"
  60 #define DAV_PROPFIND_RESP ".multistatus.response"
  61 #define DAV_PROPFIND_NAME ".multistatus.response.href"
  62 #define DAV_PROPFIND_COLLECTION ".multistatus.response.propstat.prop.resourcetype.collection"
  63
  64 /* DAV request body templates */
  65 #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>"
  66 #define PROPFIND_ALL_REQUEST "<?xml version=\"1.0\" encoding=\"utf-8\" ?>\n<D:propfind xmlns:D=\"DAV:\">\n<D:allprop/>\n</D:propfind>"
  67 #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>"
  68
  69 #define LOCK_TIME 600
  70 #define LOCK_REFRESH 30
  71
  72 /* Remember to update object flag allocation in object.h */
  73 #define LOCAL    (1u<<16)
  74 #define REMOTE   (1u<<17)
  75 #define FETCHING (1u<<18)
  76 #define PUSHING  (1u<<19)
  77
  78 /* We allow "recursive" symbolic refs. Only within reason, though */
  79 #define MAXDEPTH 5
  80
  81 static int pushing;
  82 static int aborted;
  83 static signed char remote_dir_exists[256];
  84
  85 static int push_verbosely;
  86 static int push_all = MATCH_REFS_NONE;
  87 static int force_all;
  88 static int dry_run;
  89 static int helper_status;
  90
  91 static struct object_list *objects;
  92
  93 struct repo {
  94         char *url;
  95         char *path;
  96         int path_len;
  97         int has_info_refs;
  98         int can_update_info_refs;
  99         int has_info_packs;
 100         struct packed_git *packs;
 101         struct remote_lock *locks;
 102 };
 103
 104 static struct repo *repo;
 105
 106 enum transfer_state {
 107         NEED_FETCH,
 108         RUN_FETCH_LOOSE,
 109         RUN_FETCH_PACKED,
 110         NEED_PUSH,
 111         RUN_MKCOL,
 112         RUN_PUT,
 113         RUN_MOVE,
 114         ABORTED,
 115         COMPLETE
 116 };
 117
 118 struct transfer_request {
 119         struct object *obj;
 120         char *url;
 121         char *dest;
 122         struct remote_lock *lock;
 123         struct curl_slist *headers;
 124         struct buffer buffer;
 125         enum transfer_state state;
 126         CURLcode curl_result;
 127         char errorstr[CURL_ERROR_SIZE];
 128         long http_code;
 129         void *userData;
 130         struct active_request_slot *slot;
 131         struct transfer_request *next;
 132 };
 133
 134 static struct transfer_request *request_queue_head;
 135
 136 struct xml_ctx {
 137         char *name;
 138         int len;
 139         char *cdata;
 140         void (*userFunc)(struct xml_ctx *ctx, int tag_closed);
 141         void *userData;
 142 };
 143
 144 struct remote_lock {
 145         char *url;
 146         char *owner;
 147         char *token;
 148         char tmpfile_suffix[GIT_MAX_HEXSZ + 1];
 149         time_t start_time;
 150         long timeout;
 151         int refreshing;
 152         struct remote_lock *next;
 153 };
 154
 155 /* Flags that control remote_ls processing */
 156 #define PROCESS_FILES (1u << 0)
 157 #define PROCESS_DIRS  (1u << 1)
 158 #define RECURSIVE     (1u << 2)
 159
 160 /* Flags that remote_ls passes to callback functions */
 161 #define IS_DIR (1u << 0)
 162
 163 struct remote_ls_ctx {
 164         char *path;
 165         void (*userFunc)(struct remote_ls_ctx *ls);
 166         void *userData;
 167         int flags;
 168         char *dentry_name;
 169         int dentry_flags;
 170         struct remote_ls_ctx *parent;
 171 };
 172
 173 /* get_dav_token_headers options */
 174 enum dav_header_flag {
 175         DAV_HEADER_IF = (1u << 0),
 176         DAV_HEADER_LOCK = (1u << 1),
 177         DAV_HEADER_TIMEOUT = (1u << 2)
 178 };
 179
 180 static char *xml_entities(const char *s)
 181 {
 182         struct strbuf buf = STRBUF_INIT;
 183         strbuf_addstr_xml_quoted(&buf, s);
 184         return strbuf_detach(&buf, NULL);
 185 }
 186
 187 static void curl_setup_http_get(CURL *curl, const char *url,
 188                 const char *custom_req)
 189 {
 190         curl_easy_setopt(curl, CURLOPT_HTTPGET, 1);
 191         curl_easy_setopt(curl, CURLOPT_URL, url);
 192         curl_easy_setopt(curl, CURLOPT_CUSTOMREQUEST, custom_req);
 193         curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, fwrite_null);
 194 }
 195
 196 static void curl_setup_http(CURL *curl, const char *url,
 197                 const char *custom_req, struct buffer *buffer,
 198                 curl_write_callback write_fn)
 199 {
 200         curl_easy_setopt(curl, CURLOPT_PUT, 1);
 201         curl_easy_setopt(curl, CURLOPT_URL, url);
 202         curl_easy_setopt(curl, CURLOPT_INFILE, buffer);
 203         curl_easy_setopt(curl, CURLOPT_INFILESIZE, buffer->buf.len);
 204         curl_easy_setopt(curl, CURLOPT_READFUNCTION, fread_buffer);
 205 #ifndef NO_CURL_IOCTL
 206         curl_easy_setopt(curl, CURLOPT_IOCTLFUNCTION, ioctl_buffer);
 207         curl_easy_setopt(curl, CURLOPT_IOCTLDATA, buffer);
 208 #endif
 209         curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, write_fn);
 210         curl_easy_setopt(curl, CURLOPT_NOBODY, 0);
 211         curl_easy_setopt(curl, CURLOPT_CUSTOMREQUEST, custom_req);
 212         curl_easy_setopt(curl, CURLOPT_UPLOAD, 1);
 213 }
 214
 215 static struct curl_slist *get_dav_token_headers(struct remote_lock *lock, enum dav_header_flag options)
 216 {
 217         struct strbuf buf = STRBUF_INIT;
 218         struct curl_slist *dav_headers = http_copy_default_headers();
 219
 220         if (options & DAV_HEADER_IF) {
 221                 strbuf_addf(&buf, "If: (<%s>)", lock->token);
 222                 dav_headers = curl_slist_append(dav_headers, buf.buf);
 223                 strbuf_reset(&buf);
 224         }
 225         if (options & DAV_HEADER_LOCK) {
 226                 strbuf_addf(&buf, "Lock-Token: <%s>", lock->token);
 227                 dav_headers = curl_slist_append(dav_headers, buf.buf);
 228                 strbuf_reset(&buf);
 229         }
 230         if (options & DAV_HEADER_TIMEOUT) {
 231                 strbuf_addf(&buf, "Timeout: Second-%ld", lock->timeout);
 232                 dav_headers = curl_slist_append(dav_headers, buf.buf);
 233                 strbuf_reset(&buf);
 234         }
 235         strbuf_release(&buf);
 236
 237         return dav_headers;
 238 }
 239
 240 static void finish_request(struct transfer_request *request);
 241 static void release_request(struct transfer_request *request);
 242
 243 static void process_response(void *callback_data)
 244 {
 245         struct transfer_request *request =
 246                 (struct transfer_request *)callback_data;
 247
 248         finish_request(request);
 249 }
 250
 251 #ifdef USE_CURL_MULTI
 252
 253 static void start_fetch_loose(struct transfer_request *request)
 254 {
 255         struct active_request_slot *slot;
 256         struct http_object_request *obj_req;
 257
 258         obj_req = new_http_object_request(repo->url, &request->obj->oid);
 259         if (obj_req == NULL) {
 260                 request->state = ABORTED;
 261                 return;
 262         }
 263
 264         slot = obj_req->slot;
 265         slot->callback_func = process_response;
 266         slot->callback_data = request;
 267         request->slot = slot;
 268         request->userData = obj_req;
 269
 270         /* Try to get the request started, abort the request on error */
 271         request->state = RUN_FETCH_LOOSE;
 272         if (!start_active_slot(slot)) {
 273                 fprintf(stderr, "Unable to start GET request\n");
 274                 repo->can_update_info_refs = 0;
 275                 release_http_object_request(obj_req);
 276                 release_request(request);
 277         }
 278 }
 279
 280 static void start_mkcol(struct transfer_request *request)
 281 {
 282         char *hex = oid_to_hex(&request->obj->oid);
 283         struct active_request_slot *slot;
 284
 285         request->url = get_remote_object_url(repo->url, hex, 1);
 286
 287         slot = get_active_slot();
 288         slot->callback_func = process_response;
 289         slot->callback_data = request;
 290         curl_setup_http_get(slot->curl, request->url, DAV_MKCOL);
 291         curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, request->errorstr);
 292
 293         if (start_active_slot(slot)) {
 294                 request->slot = slot;
 295                 request->state = RUN_MKCOL;
 296         } else {
 297                 request->state = ABORTED;
 298                 FREE_AND_NULL(request->url);
 299         }
 300 }
 301 #endif
 302
 303 static void start_fetch_packed(struct transfer_request *request)
 304 {
 305         struct packed_git *target;
 306
 307         struct transfer_request *check_request = request_queue_head;
 308         struct http_pack_request *preq;
 309
 310         target = find_sha1_pack(request->obj->oid.hash, repo->packs);
 311         if (!target) {
 312                 fprintf(stderr, "Unable to fetch %s, will not be able to update server info refs\n", oid_to_hex(&request->obj->oid));
 313                 repo->can_update_info_refs = 0;
 314                 release_request(request);
 315                 return;
 316         }
 317
 318         fprintf(stderr, "Fetching pack %s\n",
 319                 hash_to_hex(target->hash));
 320         fprintf(stderr, " which contains %s\n", oid_to_hex(&request->obj->oid));
 321
 322         preq = new_http_pack_request(target, repo->url);
 323         if (preq == NULL) {
 324                 repo->can_update_info_refs = 0;
 325                 return;
 326         }
 327         preq->lst = &repo->packs;
 328
 329         /* Make sure there isn't another open request for this pack */
 330         while (check_request) {
 331                 if (check_request->state == RUN_FETCH_PACKED &&
 332                     !strcmp(check_request->url, preq->url)) {
 333                         release_http_pack_request(preq);
 334                         release_request(request);
 335                         return;
 336                 }
 337                 check_request = check_request->next;
 338         }
 339
 340         preq->slot->callback_func = process_response;
 341         preq->slot->callback_data = request;
 342         request->slot = preq->slot;
 343         request->userData = preq;
 344
 345         /* Try to get the request started, abort the request on error */
 346         request->state = RUN_FETCH_PACKED;
 347         if (!start_active_slot(preq->slot)) {
 348                 fprintf(stderr, "Unable to start GET request\n");
 349                 release_http_pack_request(preq);
 350                 repo->can_update_info_refs = 0;
 351                 release_request(request);
 352         }
 353 }
 354
 355 static void start_put(struct transfer_request *request)
 356 {
 357         char *hex = oid_to_hex(&request->obj->oid);
 358         struct active_request_slot *slot;
 359         struct strbuf buf = STRBUF_INIT;
 360         enum object_type type;
 361         char hdr[50];
 362         void *unpacked;
 363         unsigned long len;
 364         int hdrlen;
 365         ssize_t size;
 366         git_zstream stream;
 367
 368         unpacked = read_object_file(&request->obj->oid, &type, &len);
 369         hdrlen = xsnprintf(hdr, sizeof(hdr), "%s %"PRIuMAX , type_name(type), (uintmax_t)len) + 1;
 370
 371         /* Set it up */
 372         git_deflate_init(&stream, zlib_compression_level);
 373         size = git_deflate_bound(&stream, len + hdrlen);
 374         strbuf_init(&request->buffer.buf, size);
 375         request->buffer.posn = 0;
 376
 377         /* Compress it */
 378         stream.next_out = (unsigned char *)request->buffer.buf.buf;
 379         stream.avail_out = size;
 380
 381         /* First header.. */
 382         stream.next_in = (void *)hdr;
 383         stream.avail_in = hdrlen;
 384         while (git_deflate(&stream, 0) == Z_OK)
 385                 ; /* nothing */
 386
 387         /* Then the data itself.. */
 388         stream.next_in = unpacked;
 389         stream.avail_in = len;
 390         while (git_deflate(&stream, Z_FINISH) == Z_OK)
 391                 ; /* nothing */
 392         git_deflate_end(&stream);
 393         free(unpacked);
 394
 395         request->buffer.buf.len = stream.total_out;
 396
 397         strbuf_addstr(&buf, "Destination: ");
 398         append_remote_object_url(&buf, repo->url, hex, 0);
 399         request->dest = strbuf_detach(&buf, NULL);
 400
 401         append_remote_object_url(&buf, repo->url, hex, 0);
 402         strbuf_add(&buf, request->lock->tmpfile_suffix, the_hash_algo->hexsz + 1);
 403         request->url = strbuf_detach(&buf, NULL);
 404
 405         slot = get_active_slot();
 406         slot->callback_func = process_response;
 407         slot->callback_data = request;
 408         curl_setup_http(slot->curl, request->url, DAV_PUT,
 409                         &request->buffer, fwrite_null);
 410
 411         if (start_active_slot(slot)) {
 412                 request->slot = slot;
 413                 request->state = RUN_PUT;
 414         } else {
 415                 request->state = ABORTED;
 416                 FREE_AND_NULL(request->url);
 417         }
 418 }
 419
 420 static void start_move(struct transfer_request *request)
 421 {
 422         struct active_request_slot *slot;
 423         struct curl_slist *dav_headers = http_copy_default_headers();
 424
 425         slot = get_active_slot();
 426         slot->callback_func = process_response;
 427         slot->callback_data = request;
 428         curl_setup_http_get(slot->curl, request->url, DAV_MOVE);
 429         dav_headers = curl_slist_append(dav_headers, request->dest);
 430         dav_headers = curl_slist_append(dav_headers, "Overwrite: T");
 431         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
 432
 433         if (start_active_slot(slot)) {
 434                 request->slot = slot;
 435                 request->state = RUN_MOVE;
 436         } else {
 437                 request->state = ABORTED;
 438                 FREE_AND_NULL(request->url);
 439         }
 440 }
 441
 442 static int refresh_lock(struct remote_lock *lock)
 443 {
 444         struct active_request_slot *slot;
 445         struct slot_results results;
 446         struct curl_slist *dav_headers;
 447         int rc = 0;
 448
 449         lock->refreshing = 1;
 450
 451         dav_headers = get_dav_token_headers(lock, DAV_HEADER_IF | DAV_HEADER_TIMEOUT);
 452
 453         slot = get_active_slot();
 454         slot->results = &results;
 455         curl_setup_http_get(slot->curl, lock->url, DAV_LOCK);
 456         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
 457
 458         if (start_active_slot(slot)) {
 459                 run_active_slot(slot);
 460                 if (results.curl_result != CURLE_OK) {
 461                         fprintf(stderr, "LOCK HTTP error %ld\n",
 462                                 results.http_code);
 463                 } else {
 464                         lock->start_time = time(NULL);
 465                         rc = 1;
 466                 }
 467         }
 468
 469         lock->refreshing = 0;
 470         curl_slist_free_all(dav_headers);
 471
 472         return rc;
 473 }
 474
 475 static void check_locks(void)
 476 {
 477         struct remote_lock *lock = repo->locks;
 478         time_t current_time = time(NULL);
 479         int time_remaining;
 480
 481         while (lock) {
 482                 time_remaining = lock->start_time + lock->timeout -
 483                         current_time;
 484                 if (!lock->refreshing && time_remaining < LOCK_REFRESH) {
 485                         if (!refresh_lock(lock)) {
 486                                 fprintf(stderr,
 487                                         "Unable to refresh lock for %s\n",
 488                                         lock->url);
 489                                 aborted = 1;
 490                                 return;
 491                         }
 492                 }
 493                 lock = lock->next;
 494         }
 495 }
 496
 497 static void release_request(struct transfer_request *request)
 498 {
 499         struct transfer_request *entry = request_queue_head;
 500
 501         if (request == request_queue_head) {
 502                 request_queue_head = request->next;
 503         } else {
 504                 while (entry->next != NULL && entry->next != request)
 505                         entry = entry->next;
 506                 if (entry->next == request)
 507                         entry->next = entry->next->next;
 508         }
 509
 510         free(request->url);
 511         free(request);
 512 }
 513
 514 static void finish_request(struct transfer_request *request)
 515 {
 516         struct http_pack_request *preq;
 517         struct http_object_request *obj_req;
 518
 519         request->curl_result = request->slot->curl_result;
 520         request->http_code = request->slot->http_code;
 521         request->slot = NULL;
 522
 523         /* Keep locks active */
 524         check_locks();
 525
 526         if (request->headers != NULL)
 527                 curl_slist_free_all(request->headers);
 528
 529         /* URL is reused for MOVE after PUT and used during FETCH */
 530         if (request->state != RUN_PUT && request->state != RUN_FETCH_PACKED) {
 531                 FREE_AND_NULL(request->url);
 532         }
 533
 534         if (request->state == RUN_MKCOL) {
 535                 if (request->curl_result == CURLE_OK ||
 536                     request->http_code == 405) {
 537                         remote_dir_exists[request->obj->oid.hash[0]] = 1;
 538                         start_put(request);
 539                 } else {
 540                         fprintf(stderr, "MKCOL %s failed, aborting (%d/%ld)\n",
 541                                 oid_to_hex(&request->obj->oid),
 542                                 request->curl_result, request->http_code);
 543                         request->state = ABORTED;
 544                         aborted = 1;
 545                 }
 546         } else if (request->state == RUN_PUT) {
 547                 if (request->curl_result == CURLE_OK) {
 548                         start_move(request);
 549                 } else {
 550                         fprintf(stderr, "PUT %s failed, aborting (%d/%ld)\n",
 551                                 oid_to_hex(&request->obj->oid),
 552                                 request->curl_result, request->http_code);
 553                         request->state = ABORTED;
 554                         aborted = 1;
 555                 }
 556         } else if (request->state == RUN_MOVE) {
 557                 if (request->curl_result == CURLE_OK) {
 558                         if (push_verbosely)
 559                                 fprintf(stderr, "    sent %s\n",
 560                                         oid_to_hex(&request->obj->oid));
 561                         request->obj->flags |= REMOTE;
 562                         release_request(request);
 563                 } else {
 564                         fprintf(stderr, "MOVE %s failed, aborting (%d/%ld)\n",
 565                                 oid_to_hex(&request->obj->oid),
 566                                 request->curl_result, request->http_code);
 567                         request->state = ABORTED;
 568                         aborted = 1;
 569                 }
 570         } else if (request->state == RUN_FETCH_LOOSE) {
 571                 obj_req = (struct http_object_request *)request->userData;
 572
 573                 if (finish_http_object_request(obj_req) == 0)
 574                         if (obj_req->rename == 0)
 575                                 request->obj->flags |= (LOCAL | REMOTE);
 576
 577                 /* Try fetching packed if necessary */
 578                 if (request->obj->flags & LOCAL) {
 579                         release_http_object_request(obj_req);
 580                         release_request(request);
 581                 } else
 582                         start_fetch_packed(request);
 583
 584         } else if (request->state == RUN_FETCH_PACKED) {
 585                 int fail = 1;
 586                 if (request->curl_result != CURLE_OK) {
 587                         fprintf(stderr, "Unable to get pack file %s\n%s",
 588                                 request->url, curl_errorstr);
 589                 } else {
 590                         preq = (struct http_pack_request *)request->userData;
 591
 592                         if (preq) {
 593                                 if (finish_http_pack_request(preq) == 0)
 594                                         fail = 0;
 595                                 release_http_pack_request(preq);
 596                         }
 597                 }
 598                 if (fail)
 599                         repo->can_update_info_refs = 0;
 600                 release_request(request);
 601         }
 602 }
 603
 604 #ifdef USE_CURL_MULTI
 605 static int is_running_queue;
 606 static int fill_active_slot(void *unused)
 607 {
 608         struct transfer_request *request;
 609
 610         if (aborted || !is_running_queue)
 611                 return 0;
 612
 613         for (request = request_queue_head; request; request = request->next) {
 614                 if (request->state == NEED_FETCH) {
 615                         start_fetch_loose(request);
 616                         return 1;
 617                 } else if (pushing && request->state == NEED_PUSH) {
 618                         if (remote_dir_exists[request->obj->oid.hash[0]] == 1) {
 619                                 start_put(request);
 620                         } else {
 621                                 start_mkcol(request);
 622                         }
 623                         return 1;
 624                 }
 625         }
 626         return 0;
 627 }
 628 #endif
 629
 630 static void get_remote_object_list(unsigned char parent);
 631
 632 static void add_fetch_request(struct object *obj)
 633 {
 634         struct transfer_request *request;
 635
 636         check_locks();
 637
 638         /*
 639          * Don't fetch the object if it's known to exist locally
 640          * or is already in the request queue
 641          */
 642         if (remote_dir_exists[obj->oid.hash[0]] == -1)
 643                 get_remote_object_list(obj->oid.hash[0]);
 644         if (obj->flags & (LOCAL | FETCHING))
 645                 return;
 646
 647         obj->flags |= FETCHING;
 648         request = xmalloc(sizeof(*request));
 649         request->obj = obj;
 650         request->url = NULL;
 651         request->lock = NULL;
 652         request->headers = NULL;
 653         request->state = NEED_FETCH;
 654         request->next = request_queue_head;
 655         request_queue_head = request;
 656
 657 #ifdef USE_CURL_MULTI
 658         fill_active_slots();
 659         step_active_slots();
 660 #endif
 661 }
 662
 663 static int add_send_request(struct object *obj, struct remote_lock *lock)
 664 {
 665         struct transfer_request *request;
 666         struct packed_git *target;
 667
 668         /* Keep locks active */
 669         check_locks();
 670
 671         /*
 672          * Don't push the object if it's known to exist on the remote
 673          * or is already in the request queue
 674          */
 675         if (remote_dir_exists[obj->oid.hash[0]] == -1)
 676                 get_remote_object_list(obj->oid.hash[0]);
 677         if (obj->flags & (REMOTE | PUSHING))
 678                 return 0;
 679         target = find_sha1_pack(obj->oid.hash, repo->packs);
 680         if (target) {
 681                 obj->flags |= REMOTE;
 682                 return 0;
 683         }
 684
 685         obj->flags |= PUSHING;
 686         request = xmalloc(sizeof(*request));
 687         request->obj = obj;
 688         request->url = NULL;
 689         request->lock = lock;
 690         request->headers = NULL;
 691         request->state = NEED_PUSH;
 692         request->next = request_queue_head;
 693         request_queue_head = request;
 694
 695 #ifdef USE_CURL_MULTI
 696         fill_active_slots();
 697         step_active_slots();
 698 #endif
 699
 700         return 1;
 701 }
 702
 703 static int fetch_indices(void)
 704 {
 705         int ret;
 706
 707         if (push_verbosely)
 708                 fprintf(stderr, "Getting pack list\n");
 709
 710         switch (http_get_info_packs(repo->url, &repo->packs)) {
 711         case HTTP_OK:
 712         case HTTP_MISSING_TARGET:
 713                 ret = 0;
 714                 break;
 715         default:
 716                 ret = -1;
 717         }
 718
 719         return ret;
 720 }
 721
 722 static void one_remote_object(const struct object_id *oid)
 723 {
 724         struct object *obj;
 725
 726         obj = lookup_object(the_repository, oid);
 727         if (!obj)
 728                 obj = parse_object(the_repository, oid);
 729
 730         /* Ignore remote objects that don't exist locally */
 731         if (!obj)
 732                 return;
 733
 734         obj->flags |= REMOTE;
 735         if (!object_list_contains(objects, obj))
 736                 object_list_insert(obj, &objects);
 737 }
 738
 739 static void handle_lockprop_ctx(struct xml_ctx *ctx, int tag_closed)
 740 {
 741         int *lock_flags = (int *)ctx->userData;
 742
 743         if (tag_closed) {
 744                 if (!strcmp(ctx->name, DAV_CTX_LOCKENTRY)) {
 745                         if ((*lock_flags & DAV_PROP_LOCKEX) &&
 746                             (*lock_flags & DAV_PROP_LOCKWR)) {
 747                                 *lock_flags |= DAV_LOCK_OK;
 748                         }
 749                         *lock_flags &= DAV_LOCK_OK;
 750                 } else if (!strcmp(ctx->name, DAV_CTX_LOCKTYPE_WRITE)) {
 751                         *lock_flags |= DAV_PROP_LOCKWR;
 752                 } else if (!strcmp(ctx->name, DAV_CTX_LOCKTYPE_EXCLUSIVE)) {
 753                         *lock_flags |= DAV_PROP_LOCKEX;
 754                 }
 755         }
 756 }
 757
 758 static void handle_new_lock_ctx(struct xml_ctx *ctx, int tag_closed)
 759 {
 760         struct remote_lock *lock = (struct remote_lock *)ctx->userData;
 761         git_hash_ctx hash_ctx;
 762         unsigned char lock_token_hash[GIT_MAX_RAWSZ];
 763
 764         if (tag_closed && ctx->cdata) {
 765                 if (!strcmp(ctx->name, DAV_ACTIVELOCK_OWNER)) {
 766                         lock->owner = xstrdup(ctx->cdata);
 767                 } else if (!strcmp(ctx->name, DAV_ACTIVELOCK_TIMEOUT)) {
 768                         const char *arg;
 769                         if (skip_prefix(ctx->cdata, "Second-", &arg))
 770                                 lock->timeout = strtol(arg, NULL, 10);
 771                 } else if (!strcmp(ctx->name, DAV_ACTIVELOCK_TOKEN)) {
 772                         lock->token = xstrdup(ctx->cdata);
 773
 774                         the_hash_algo->init_fn(&hash_ctx);
 775                         the_hash_algo->update_fn(&hash_ctx, lock->token, strlen(lock->token));
 776                         the_hash_algo->final_fn(lock_token_hash, &hash_ctx);
 777
 778                         lock->tmpfile_suffix[0] = '_';
 779                         memcpy(lock->tmpfile_suffix + 1, hash_to_hex(lock_token_hash), the_hash_algo->hexsz);
 780                 }
 781         }
 782 }
 783
 784 static void one_remote_ref(const char *refname);
 785
 786 static void
 787 xml_start_tag(void *userData, const char *name, const char **atts)
 788 {
 789         struct xml_ctx *ctx = (struct xml_ctx *)userData;
 790         const char *c = strchr(name, ':');
 791         int old_namelen, new_len;
 792
 793         if (c == NULL)
 794                 c = name;
 795         else
 796                 c++;
 797
 798         old_namelen = strlen(ctx->name);
 799         new_len = old_namelen + strlen(c) + 2;
 800
 801         if (new_len > ctx->len) {
 802                 ctx->name = xrealloc(ctx->name, new_len);
 803                 ctx->len = new_len;
 804         }
 805         xsnprintf(ctx->name + old_namelen, ctx->len - old_namelen, ".%s", c);
 806
 807         FREE_AND_NULL(ctx->cdata);
 808
 809         ctx->userFunc(ctx, 0);
 810 }
 811
 812 static void
 813 xml_end_tag(void *userData, const char *name)
 814 {
 815         struct xml_ctx *ctx = (struct xml_ctx *)userData;
 816         const char *c = strchr(name, ':');
 817         char *ep;
 818
 819         ctx->userFunc(ctx, 1);
 820
 821         if (c == NULL)
 822                 c = name;
 823         else
 824                 c++;
 825
 826         ep = ctx->name + strlen(ctx->name) - strlen(c) - 1;
 827         *ep = 0;
 828 }
 829
 830 static void
 831 xml_cdata(void *userData, const XML_Char *s, int len)
 832 {
 833         struct xml_ctx *ctx = (struct xml_ctx *)userData;
 834         free(ctx->cdata);
 835         ctx->cdata = xmemdupz(s, len);
 836 }
 837
 838 static struct remote_lock *lock_remote(const char *path, long timeout)
 839 {
 840         struct active_request_slot *slot;
 841         struct slot_results results;
 842         struct buffer out_buffer = { STRBUF_INIT, 0 };
 843         struct strbuf in_buffer = STRBUF_INIT;
 844         char *url;
 845         char *ep;
 846         char timeout_header[25];
 847         struct remote_lock *lock = NULL;
 848         struct curl_slist *dav_headers = http_copy_default_headers();
 849         struct xml_ctx ctx;
 850         char *escaped;
 851
 852         url = xstrfmt("%s%s", repo->url, path);
 853
 854         /* Make sure leading directories exist for the remote ref */
 855         ep = strchr(url + strlen(repo->url) + 1, '/');
 856         while (ep) {
 857                 char saved_character = ep[1];
 858                 ep[1] = '\0';
 859                 slot = get_active_slot();
 860                 slot->results = &results;
 861                 curl_setup_http_get(slot->curl, url, DAV_MKCOL);
 862                 if (start_active_slot(slot)) {
 863                         run_active_slot(slot);
 864                         if (results.curl_result != CURLE_OK &&
 865                             results.http_code != 405) {
 866                                 fprintf(stderr,
 867                                         "Unable to create branch path %s\n",
 868                                         url);
 869                                 free(url);
 870                                 return NULL;
 871                         }
 872                 } else {
 873                         fprintf(stderr, "Unable to start MKCOL request\n");
 874                         free(url);
 875                         return NULL;
 876                 }
 877                 ep[1] = saved_character;
 878                 ep = strchr(ep + 1, '/');
 879         }
 880
 881         escaped = xml_entities(ident_default_email());
 882         strbuf_addf(&out_buffer.buf, LOCK_REQUEST, escaped);
 883         free(escaped);
 884
 885         xsnprintf(timeout_header, sizeof(timeout_header), "Timeout: Second-%ld", timeout);
 886         dav_headers = curl_slist_append(dav_headers, timeout_header);
 887         dav_headers = curl_slist_append(dav_headers, "Content-Type: text/xml");
 888
 889         slot = get_active_slot();
 890         slot->results = &results;
 891         curl_setup_http(slot->curl, url, DAV_LOCK, &out_buffer, fwrite_buffer);
 892         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
 893         curl_easy_setopt(slot->curl, CURLOPT_FILE, &in_buffer);
 894
 895         lock = xcalloc(1, sizeof(*lock));
 896         lock->timeout = -1;
 897
 898         if (start_active_slot(slot)) {
 899                 run_active_slot(slot);
 900                 if (results.curl_result == CURLE_OK) {
 901                         XML_Parser parser = XML_ParserCreate(NULL);
 902                         enum XML_Status result;
 903                         ctx.name = xcalloc(10, 1);
 904                         ctx.len = 0;
 905                         ctx.cdata = NULL;
 906                         ctx.userFunc = handle_new_lock_ctx;
 907                         ctx.userData = lock;
 908                         XML_SetUserData(parser, &ctx);
 909                         XML_SetElementHandler(parser, xml_start_tag,
 910                                               xml_end_tag);
 911                         XML_SetCharacterDataHandler(parser, xml_cdata);
 912                         result = XML_Parse(parser, in_buffer.buf,
 913                                            in_buffer.len, 1);
 914                         free(ctx.name);
 915                         if (result != XML_STATUS_OK) {
 916                                 fprintf(stderr, "XML error: %s\n",
 917                                         XML_ErrorString(
 918                                                 XML_GetErrorCode(parser)));
 919                                 lock->timeout = -1;
 920                         }
 921                         XML_ParserFree(parser);
 922                 } else {
 923                         fprintf(stderr,
 924                                 "error: curl result=%d, HTTP code=%ld\n",
 925                                 results.curl_result, results.http_code);
 926                 }
 927         } else {
 928                 fprintf(stderr, "Unable to start LOCK request\n");
 929         }
 930
 931         curl_slist_free_all(dav_headers);
 932         strbuf_release(&out_buffer.buf);
 933         strbuf_release(&in_buffer);
 934
 935         if (lock->token == NULL || lock->timeout <= 0) {
 936                 free(lock->token);
 937                 free(lock->owner);
 938                 free(url);
 939                 FREE_AND_NULL(lock);
 940         } else {
 941                 lock->url = url;
 942                 lock->start_time = time(NULL);
 943                 lock->next = repo->locks;
 944                 repo->locks = lock;
 945         }
 946
 947         return lock;
 948 }
 949
 950 static int unlock_remote(struct remote_lock *lock)
 951 {
 952         struct active_request_slot *slot;
 953         struct slot_results results;
 954         struct remote_lock *prev = repo->locks;
 955         struct curl_slist *dav_headers;
 956         int rc = 0;
 957
 958         dav_headers = get_dav_token_headers(lock, DAV_HEADER_LOCK);
 959
 960         slot = get_active_slot();
 961         slot->results = &results;
 962         curl_setup_http_get(slot->curl, lock->url, DAV_UNLOCK);
 963         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
 964
 965         if (start_active_slot(slot)) {
 966                 run_active_slot(slot);
 967                 if (results.curl_result == CURLE_OK)
 968                         rc = 1;
 969                 else
 970                         fprintf(stderr, "UNLOCK HTTP error %ld\n",
 971                                 results.http_code);
 972         } else {
 973                 fprintf(stderr, "Unable to start UNLOCK request\n");
 974         }
 975
 976         curl_slist_free_all(dav_headers);
 977
 978         if (repo->locks == lock) {
 979                 repo->locks = lock->next;
 980         } else {
 981                 while (prev && prev->next != lock)
 982                         prev = prev->next;
 983                 if (prev)
 984                         prev->next = prev->next->next;
 985         }
 986
 987         free(lock->owner);
 988         free(lock->url);
 989         free(lock->token);
 990         free(lock);
 991
 992         return rc;
 993 }
 994
 995 static void remove_locks(void)
 996 {
 997         struct remote_lock *lock = repo->locks;
 998
 999         fprintf(stderr, "Removing remote locks...\n");
1000         while (lock) {
1001                 struct remote_lock *next = lock->next;
1002                 unlock_remote(lock);
1003                 lock = next;
1004         }
1005 }
1006
1007 static void remove_locks_on_signal(int signo)
1008 {
1009         remove_locks();
1010         sigchain_pop(signo);
1011         raise(signo);
1012 }
1013
1014 static void remote_ls(const char *path, int flags,
1015                       void (*userFunc)(struct remote_ls_ctx *ls),
1016                       void *userData);
1017
1018 /* extract hex from sharded "xx/x{38}" filename */
1019 static int get_oid_hex_from_objpath(const char *path, struct object_id *oid)
1020 {
1021         if (strlen(path) != the_hash_algo->hexsz + 1)
1022                 return -1;
1023
1024         if (hex_to_bytes(oid->hash, path, 1))
1025                 return -1;
1026         path += 2;
1027         path++; /* skip '/' */
1028
1029         return hex_to_bytes(oid->hash + 1, path, the_hash_algo->rawsz - 1);
1030 }
1031
1032 static void process_ls_object(struct remote_ls_ctx *ls)
1033 {
1034         unsigned int *parent = (unsigned int *)ls->userData;
1035         const char *path = ls->dentry_name;
1036         struct object_id oid;
1037
1038         if (!strcmp(ls->path, ls->dentry_name) && (ls->flags & IS_DIR)) {
1039                 remote_dir_exists[*parent] = 1;
1040                 return;
1041         }
1042
1043         if (!skip_prefix(path, "objects/", &path) ||
1044             get_oid_hex_from_objpath(path, &oid))
1045                 return;
1046
1047         one_remote_object(&oid);
1048 }
1049
1050 static void process_ls_ref(struct remote_ls_ctx *ls)
1051 {
1052         if (!strcmp(ls->path, ls->dentry_name) && (ls->dentry_flags & IS_DIR)) {
1053                 fprintf(stderr, "  %s\n", ls->dentry_name);
1054                 return;
1055         }
1056
1057         if (!(ls->dentry_flags & IS_DIR))
1058                 one_remote_ref(ls->dentry_name);
1059 }
1060
1061 static void handle_remote_ls_ctx(struct xml_ctx *ctx, int tag_closed)
1062 {
1063         struct remote_ls_ctx *ls = (struct remote_ls_ctx *)ctx->userData;
1064
1065         if (tag_closed) {
1066                 if (!strcmp(ctx->name, DAV_PROPFIND_RESP) && ls->dentry_name) {
1067                         if (ls->dentry_flags & IS_DIR) {
1068
1069                                 /* ensure collection names end with slash */
1070                                 str_end_url_with_slash(ls->dentry_name, &ls->dentry_name);
1071
1072                                 if (ls->flags & PROCESS_DIRS) {
1073                                         ls->userFunc(ls);
1074                                 }
1075                                 if (strcmp(ls->dentry_name, ls->path) &&
1076                                     ls->flags & RECURSIVE) {
1077                                         remote_ls(ls->dentry_name,
1078                                                   ls->flags,
1079                                                   ls->userFunc,
1080                                                   ls->userData);
1081                                 }
1082                         } else if (ls->flags & PROCESS_FILES) {
1083                                 ls->userFunc(ls);
1084                         }
1085                 } else if (!strcmp(ctx->name, DAV_PROPFIND_NAME) && ctx->cdata) {
1086                         char *path = ctx->cdata;
1087                         if (*ctx->cdata == 'h') {
1088                                 path = strstr(path, "//");
1089                                 if (path) {
1090                                         path = strchr(path+2, '/');
1091                                 }
1092                         }
1093                         if (path) {
1094                                 const char *url = repo->url;
1095                                 if (repo->path)
1096                                         url = repo->path;
1097                                 if (strncmp(path, url, repo->path_len))
1098                                         error("Parsed path '%s' does not match url: '%s'",
1099                                               path, url);
1100                                 else {
1101                                         path += repo->path_len;
1102                                         ls->dentry_name = xstrdup(path);
1103                                 }
1104                         }
1105                 } else if (!strcmp(ctx->name, DAV_PROPFIND_COLLECTION)) {
1106                         ls->dentry_flags |= IS_DIR;
1107                 }
1108         } else if (!strcmp(ctx->name, DAV_PROPFIND_RESP)) {
1109                 FREE_AND_NULL(ls->dentry_name);
1110                 ls->dentry_flags = 0;
1111         }
1112 }
1113
1114 /*
1115  * NEEDSWORK: remote_ls() ignores info/refs on the remote side.  But it
1116  * should _only_ heed the information from that file, instead of trying to
1117  * determine the refs from the remote file system (badly: it does not even
1118  * know about packed-refs).
1119  */
1120 static void remote_ls(const char *path, int flags,
1121                       void (*userFunc)(struct remote_ls_ctx *ls),
1122                       void *userData)
1123 {
1124         char *url = xstrfmt("%s%s", repo->url, path);
1125         struct active_request_slot *slot;
1126         struct slot_results results;
1127         struct strbuf in_buffer = STRBUF_INIT;
1128         struct buffer out_buffer = { STRBUF_INIT, 0 };
1129         struct curl_slist *dav_headers = http_copy_default_headers();
1130         struct xml_ctx ctx;
1131         struct remote_ls_ctx ls;
1132
1133         ls.flags = flags;
1134         ls.path = xstrdup(path);
1135         ls.dentry_name = NULL;
1136         ls.dentry_flags = 0;
1137         ls.userData = userData;
1138         ls.userFunc = userFunc;
1139
1140         strbuf_addstr(&out_buffer.buf, PROPFIND_ALL_REQUEST);
1141
1142         dav_headers = curl_slist_append(dav_headers, "Depth: 1");
1143         dav_headers = curl_slist_append(dav_headers, "Content-Type: text/xml");
1144
1145         slot = get_active_slot();
1146         slot->results = &results;
1147         curl_setup_http(slot->curl, url, DAV_PROPFIND,
1148                         &out_buffer, fwrite_buffer);
1149         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
1150         curl_easy_setopt(slot->curl, CURLOPT_FILE, &in_buffer);
1151
1152         if (start_active_slot(slot)) {
1153                 run_active_slot(slot);
1154                 if (results.curl_result == CURLE_OK) {
1155                         XML_Parser parser = XML_ParserCreate(NULL);
1156                         enum XML_Status result;
1157                         ctx.name = xcalloc(10, 1);
1158                         ctx.len = 0;
1159                         ctx.cdata = NULL;
1160                         ctx.userFunc = handle_remote_ls_ctx;
1161                         ctx.userData = &ls;
1162                         XML_SetUserData(parser, &ctx);
1163                         XML_SetElementHandler(parser, xml_start_tag,
1164                                               xml_end_tag);
1165                         XML_SetCharacterDataHandler(parser, xml_cdata);
1166                         result = XML_Parse(parser, in_buffer.buf,
1167                                            in_buffer.len, 1);
1168                         free(ctx.name);
1169
1170                         if (result != XML_STATUS_OK) {
1171                                 fprintf(stderr, "XML error: %s\n",
1172                                         XML_ErrorString(
1173                                                 XML_GetErrorCode(parser)));
1174                         }
1175                         XML_ParserFree(parser);
1176                 }
1177         } else {
1178                 fprintf(stderr, "Unable to start PROPFIND request\n");
1179         }
1180
1181         free(ls.path);
1182         free(url);
1183         strbuf_release(&out_buffer.buf);
1184         strbuf_release(&in_buffer);
1185         curl_slist_free_all(dav_headers);
1186 }
1187
1188 static void get_remote_object_list(unsigned char parent)
1189 {
1190         char path[] = "objects/XX/";
1191         static const char hex[] = "0123456789abcdef";
1192         unsigned int val = parent;
1193
1194         path[8] = hex[val >> 4];
1195         path[9] = hex[val & 0xf];
1196         remote_dir_exists[val] = 0;
1197         remote_ls(path, (PROCESS_FILES | PROCESS_DIRS),
1198                   process_ls_object, &val);
1199 }
1200
1201 static int locking_available(void)
1202 {
1203         struct active_request_slot *slot;
1204         struct slot_results results;
1205         struct strbuf in_buffer = STRBUF_INIT;
1206         struct buffer out_buffer = { STRBUF_INIT, 0 };
1207         struct curl_slist *dav_headers = http_copy_default_headers();
1208         struct xml_ctx ctx;
1209         int lock_flags = 0;
1210         char *escaped;
1211
1212         escaped = xml_entities(repo->url);
1213         strbuf_addf(&out_buffer.buf, PROPFIND_SUPPORTEDLOCK_REQUEST, escaped);
1214         free(escaped);
1215
1216         dav_headers = curl_slist_append(dav_headers, "Depth: 0");
1217         dav_headers = curl_slist_append(dav_headers, "Content-Type: text/xml");
1218
1219         slot = get_active_slot();
1220         slot->results = &results;
1221         curl_setup_http(slot->curl, repo->url, DAV_PROPFIND,
1222                         &out_buffer, fwrite_buffer);
1223         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
1224         curl_easy_setopt(slot->curl, CURLOPT_FILE, &in_buffer);
1225
1226         if (start_active_slot(slot)) {
1227                 run_active_slot(slot);
1228                 if (results.curl_result == CURLE_OK) {
1229                         XML_Parser parser = XML_ParserCreate(NULL);
1230                         enum XML_Status result;
1231                         ctx.name = xcalloc(10, 1);
1232                         ctx.len = 0;
1233                         ctx.cdata = NULL;
1234                         ctx.userFunc = handle_lockprop_ctx;
1235                         ctx.userData = &lock_flags;
1236                         XML_SetUserData(parser, &ctx);
1237                         XML_SetElementHandler(parser, xml_start_tag,
1238                                               xml_end_tag);
1239                         result = XML_Parse(parser, in_buffer.buf,
1240                                            in_buffer.len, 1);
1241                         free(ctx.name);
1242
1243                         if (result != XML_STATUS_OK) {
1244                                 fprintf(stderr, "XML error: %s\n",
1245                                         XML_ErrorString(
1246                                                 XML_GetErrorCode(parser)));
1247                                 lock_flags = 0;
1248                         }
1249                         XML_ParserFree(parser);
1250                         if (!lock_flags)
1251                                 error("no DAV locking support on %s",
1252                                       repo->url);
1253
1254                 } else {
1255                         error("Cannot access URL %s, return code %d",
1256                               repo->url, results.curl_result);
1257                         lock_flags = 0;
1258                 }
1259         } else {
1260                 error("Unable to start PROPFIND request on %s", repo->url);
1261         }
1262
1263         strbuf_release(&out_buffer.buf);
1264         strbuf_release(&in_buffer);
1265         curl_slist_free_all(dav_headers);
1266
1267         return lock_flags;
1268 }
1269
1270 static struct object_list **add_one_object(struct object *obj, struct object_list **p)
1271 {
1272         struct object_list *entry = xmalloc(sizeof(struct object_list));
1273         entry->item = obj;
1274         entry->next = *p;
1275         *p = entry;
1276         return &entry->next;
1277 }
1278
1279 static struct object_list **process_blob(struct blob *blob,
1280                                          struct object_list **p)
1281 {
1282         struct object *obj = &blob->object;
1283
1284         obj->flags |= LOCAL;
1285
1286         if (obj->flags & (UNINTERESTING | SEEN))
1287                 return p;
1288
1289         obj->flags |= SEEN;
1290         return add_one_object(obj, p);
1291 }
1292
1293 static struct object_list **process_tree(struct tree *tree,
1294                                          struct object_list **p)
1295 {
1296         struct object *obj = &tree->object;
1297         struct tree_desc desc;
1298         struct name_entry entry;
1299
1300         obj->flags |= LOCAL;
1301
1302         if (obj->flags & (UNINTERESTING | SEEN))
1303                 return p;
1304         if (parse_tree(tree) < 0)
1305                 die("bad tree object %s", oid_to_hex(&obj->oid));
1306
1307         obj->flags |= SEEN;
1308         p = add_one_object(obj, p);
1309
1310         init_tree_desc(&desc, tree->buffer, tree->size);
1311
1312         while (tree_entry(&desc, &entry))
1313                 switch (object_type(entry.mode)) {
1314                 case OBJ_TREE:
1315                         p = process_tree(lookup_tree(the_repository, &entry.oid),
1316                                          p);
1317                         break;
1318                 case OBJ_BLOB:
1319                         p = process_blob(lookup_blob(the_repository, &entry.oid),
1320                                          p);
1321                         break;
1322                 default:
1323                         /* Subproject commit - not in this repository */
1324                         break;
1325                 }
1326
1327         free_tree_buffer(tree);
1328         return p;
1329 }
1330
1331 static int get_delta(struct rev_info *revs, struct remote_lock *lock)
1332 {
1333         int i;
1334         struct commit *commit;
1335         struct object_list **p = &objects;
1336         int count = 0;
1337
1338         while ((commit = get_revision(revs)) != NULL) {
1339                 p = process_tree(get_commit_tree(commit), p);
1340                 commit->object.flags |= LOCAL;
1341                 if (!(commit->object.flags & UNINTERESTING))
1342                         count += add_send_request(&commit->object, lock);
1343         }
1344
1345         for (i = 0; i < revs->pending.nr; i++) {
1346                 struct object_array_entry *entry = revs->pending.objects + i;
1347                 struct object *obj = entry->item;
1348                 const char *name = entry->name;
1349
1350                 if (obj->flags & (UNINTERESTING | SEEN))
1351                         continue;
1352                 if (obj->type == OBJ_TAG) {
1353                         obj->flags |= SEEN;
1354                         p = add_one_object(obj, p);
1355                         continue;
1356                 }
1357                 if (obj->type == OBJ_TREE) {
1358                         p = process_tree((struct tree *)obj, p);
1359                         continue;
1360                 }
1361                 if (obj->type == OBJ_BLOB) {
1362                         p = process_blob((struct blob *)obj, p);
1363                         continue;
1364                 }
1365                 die("unknown pending object %s (%s)", oid_to_hex(&obj->oid), name);
1366         }
1367
1368         while (objects) {
1369                 if (!(objects->item->flags & UNINTERESTING))
1370                         count += add_send_request(objects->item, lock);
1371                 objects = objects->next;
1372         }
1373
1374         return count;
1375 }
1376
1377 static int update_remote(const struct object_id *oid, struct remote_lock *lock)
1378 {
1379         struct active_request_slot *slot;
1380         struct slot_results results;
1381         struct buffer out_buffer = { STRBUF_INIT, 0 };
1382         struct curl_slist *dav_headers;
1383
1384         dav_headers = get_dav_token_headers(lock, DAV_HEADER_IF);
1385
1386         strbuf_addf(&out_buffer.buf, "%s\n", oid_to_hex(oid));
1387
1388         slot = get_active_slot();
1389         slot->results = &results;
1390         curl_setup_http(slot->curl, lock->url, DAV_PUT,
1391                         &out_buffer, fwrite_null);
1392         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
1393
1394         if (start_active_slot(slot)) {
1395                 run_active_slot(slot);
1396                 strbuf_release(&out_buffer.buf);
1397                 if (results.curl_result != CURLE_OK) {
1398                         fprintf(stderr,
1399                                 "PUT error: curl result=%d, HTTP code=%ld\n",
1400                                 results.curl_result, results.http_code);
1401                         /* We should attempt recovery? */
1402                         return 0;
1403                 }
1404         } else {
1405                 strbuf_release(&out_buffer.buf);
1406                 fprintf(stderr, "Unable to start PUT request\n");
1407                 return 0;
1408         }
1409
1410         return 1;
1411 }
1412
1413 static struct ref *remote_refs;
1414
1415 static void one_remote_ref(const char *refname)
1416 {
1417         struct ref *ref;
1418         struct object *obj;
1419
1420         ref = alloc_ref(refname);
1421
1422         if (http_fetch_ref(repo->url, ref) != 0) {
1423                 fprintf(stderr,
1424                         "Unable to fetch ref %s from %s\n",
1425                         refname, repo->url);
1426                 free(ref);
1427                 return;
1428         }
1429
1430         /*
1431          * Fetch a copy of the object if it doesn't exist locally - it
1432          * may be required for updating server info later.
1433          */
1434         if (repo->can_update_info_refs && !has_object_file(&ref->old_oid)) {
1435                 obj = lookup_unknown_object(&ref->old_oid);
1436                 fprintf(stderr, "  fetch %s for %s\n",
1437                         oid_to_hex(&ref->old_oid), refname);
1438                 add_fetch_request(obj);
1439         }
1440
1441         ref->next = remote_refs;
1442         remote_refs = ref;
1443 }
1444
1445 static void get_dav_remote_heads(void)
1446 {
1447         remote_ls("refs/", (PROCESS_FILES | PROCESS_DIRS | RECURSIVE), process_ls_ref, NULL);
1448 }
1449
1450 static void add_remote_info_ref(struct remote_ls_ctx *ls)
1451 {
1452         struct strbuf *buf = (struct strbuf *)ls->userData;
1453         struct object *o;
1454         struct ref *ref;
1455
1456         ref = alloc_ref(ls->dentry_name);
1457
1458         if (http_fetch_ref(repo->url, ref) != 0) {
1459                 fprintf(stderr,
1460                         "Unable to fetch ref %s from %s\n",
1461                         ls->dentry_name, repo->url);
1462                 aborted = 1;
1463                 free(ref);
1464                 return;
1465         }
1466
1467         o = parse_object(the_repository, &ref->old_oid);
1468         if (!o) {
1469                 fprintf(stderr,
1470                         "Unable to parse object %s for remote ref %s\n",
1471                         oid_to_hex(&ref->old_oid), ls->dentry_name);
1472                 aborted = 1;
1473                 free(ref);
1474                 return;
1475         }
1476
1477         strbuf_addf(buf, "%s\t%s\n",
1478                     oid_to_hex(&ref->old_oid), ls->dentry_name);
1479
1480         if (o->type == OBJ_TAG) {
1481                 o = deref_tag(the_repository, o, ls->dentry_name, 0);
1482                 if (o)
1483                         strbuf_addf(buf, "%s\t%s^{}\n",
1484                                     oid_to_hex(&o->oid), ls->dentry_name);
1485         }
1486         free(ref);
1487 }
1488
1489 static void update_remote_info_refs(struct remote_lock *lock)
1490 {
1491         struct buffer buffer = { STRBUF_INIT, 0 };
1492         struct active_request_slot *slot;
1493         struct slot_results results;
1494         struct curl_slist *dav_headers;
1495
1496         remote_ls("refs/", (PROCESS_FILES | RECURSIVE),
1497                   add_remote_info_ref, &buffer.buf);
1498         if (!aborted) {
1499                 dav_headers = get_dav_token_headers(lock, DAV_HEADER_IF);
1500
1501                 slot = get_active_slot();
1502                 slot->results = &results;
1503                 curl_setup_http(slot->curl, lock->url, DAV_PUT,
1504                                 &buffer, fwrite_null);
1505                 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
1506
1507                 if (start_active_slot(slot)) {
1508                         run_active_slot(slot);
1509                         if (results.curl_result != CURLE_OK) {
1510                                 fprintf(stderr,
1511                                         "PUT error: curl result=%d, HTTP code=%ld\n",
1512                                         results.curl_result, results.http_code);
1513                         }
1514                 }
1515         }
1516         strbuf_release(&buffer.buf);
1517 }
1518
1519 static int remote_exists(const char *path)
1520 {
1521         char *url = xstrfmt("%s%s", repo->url, path);
1522         int ret;
1523
1524
1525         switch (http_get_strbuf(url, NULL, NULL)) {
1526         case HTTP_OK:
1527                 ret = 1;
1528                 break;
1529         case HTTP_MISSING_TARGET:
1530                 ret = 0;
1531                 break;
1532         case HTTP_ERROR:
1533                 error("unable to access '%s': %s", url, curl_errorstr);
1534                 /* fallthrough */
1535         default:
1536                 ret = -1;
1537         }
1538         free(url);
1539         return ret;
1540 }
1541
1542 static void fetch_symref(const char *path, char **symref, struct object_id *oid)
1543 {
1544         char *url = xstrfmt("%s%s", repo->url, path);
1545         struct strbuf buffer = STRBUF_INIT;
1546         const char *name;
1547
1548         if (http_get_strbuf(url, &buffer, NULL) != HTTP_OK)
1549                 die("Couldn't get %s for remote symref\n%s", url,
1550                     curl_errorstr);
1551         free(url);
1552
1553         FREE_AND_NULL(*symref);
1554         oidclr(oid);
1555
1556         if (buffer.len == 0)
1557                 return;
1558
1559         /* Cut off trailing newline. */
1560         strbuf_rtrim(&buffer);
1561
1562         /* If it's a symref, set the refname; otherwise try for a sha1 */
1563         if (skip_prefix(buffer.buf, "ref: ", &name)) {
1564                 *symref = xmemdupz(name, buffer.len - (name - buffer.buf));
1565         } else {
1566                 get_oid_hex(buffer.buf, oid);
1567         }
1568
1569         strbuf_release(&buffer);
1570 }
1571
1572 static int verify_merge_base(struct object_id *head_oid, struct ref *remote)
1573 {
1574         struct commit *head = lookup_commit_or_die(head_oid, "HEAD");
1575         struct commit *branch = lookup_commit_or_die(&remote->old_oid,
1576                                                      remote->name);
1577
1578         return in_merge_bases(branch, head);
1579 }
1580
1581 static int delete_remote_branch(const char *pattern, int force)
1582 {
1583         struct ref *refs = remote_refs;
1584         struct ref *remote_ref = NULL;
1585         struct object_id head_oid;
1586         char *symref = NULL;
1587         int match;
1588         int patlen = strlen(pattern);
1589         int i;
1590         struct active_request_slot *slot;
1591         struct slot_results results;
1592         char *url;
1593
1594         /* Find the remote branch(es) matching the specified branch name */
1595         for (match = 0; refs; refs = refs->next) {
1596                 char *name = refs->name;
1597                 int namelen = strlen(name);
1598                 if (namelen < patlen ||
1599                     memcmp(name + namelen - patlen, pattern, patlen))
1600                         continue;
1601                 if (namelen != patlen && name[namelen - patlen - 1] != '/')
1602                         continue;
1603                 match++;
1604                 remote_ref = refs;
1605         }
1606         if (match == 0)
1607                 return error("No remote branch matches %s", pattern);
1608         if (match != 1)
1609                 return error("More than one remote branch matches %s",
1610                              pattern);
1611
1612         /*
1613          * Remote HEAD must be a symref (not exactly foolproof; a remote
1614          * symlink to a symref will look like a symref)
1615          */
1616         fetch_symref("HEAD", &symref, &head_oid);
1617         if (!symref)
1618                 return error("Remote HEAD is not a symref");
1619
1620         /* Remote branch must not be the remote HEAD */
1621         for (i = 0; symref && i < MAXDEPTH; i++) {
1622                 if (!strcmp(remote_ref->name, symref))
1623                         return error("Remote branch %s is the current HEAD",
1624                                      remote_ref->name);
1625                 fetch_symref(symref, &symref, &head_oid);
1626         }
1627
1628         /* Run extra sanity checks if delete is not forced */
1629         if (!force) {
1630                 /* Remote HEAD must resolve to a known object */
1631                 if (symref)
1632                         return error("Remote HEAD symrefs too deep");
1633                 if (is_null_oid(&head_oid))
1634                         return error("Unable to resolve remote HEAD");
1635                 if (!has_object_file(&head_oid))
1636                         return error("Remote HEAD resolves to object %s\nwhich does not exist locally, perhaps you need to fetch?", oid_to_hex(&head_oid));
1637
1638                 /* Remote branch must resolve to a known object */
1639                 if (is_null_oid(&remote_ref->old_oid))
1640                         return error("Unable to resolve remote branch %s",
1641                                      remote_ref->name);
1642                 if (!has_object_file(&remote_ref->old_oid))
1643                         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));
1644
1645                 /* Remote branch must be an ancestor of remote HEAD */
1646                 if (!verify_merge_base(&head_oid, remote_ref)) {
1647                         return error("The branch '%s' is not an ancestor "
1648                                      "of your current HEAD.\n"
1649                                      "If you are sure you want to delete it,"
1650                                      " run:\n\t'git http-push -D %s %s'",
1651                                      remote_ref->name, repo->url, pattern);
1652                 }
1653         }
1654
1655         /* Send delete request */
1656         fprintf(stderr, "Removing remote branch '%s'\n", remote_ref->name);
1657         if (dry_run)
1658                 return 0;
1659         url = xstrfmt("%s%s", repo->url, remote_ref->name);
1660         slot = get_active_slot();
1661         slot->results = &results;
1662         curl_setup_http_get(slot->curl, url, DAV_DELETE);
1663         if (start_active_slot(slot)) {
1664                 run_active_slot(slot);
1665                 free(url);
1666                 if (results.curl_result != CURLE_OK)
1667                         return error("DELETE request failed (%d/%ld)",
1668                                      results.curl_result, results.http_code);
1669         } else {
1670                 free(url);
1671                 return error("Unable to start DELETE request");
1672         }
1673
1674         return 0;
1675 }
1676
1677 static void run_request_queue(void)
1678 {
1679 #ifdef USE_CURL_MULTI
1680         is_running_queue = 1;
1681         fill_active_slots();
1682         add_fill_function(NULL, fill_active_slot);
1683 #endif
1684         do {
1685                 finish_all_active_slots();
1686 #ifdef USE_CURL_MULTI
1687                 fill_active_slots();
1688 #endif
1689         } while (request_queue_head && !aborted);
1690
1691 #ifdef USE_CURL_MULTI
1692         is_running_queue = 0;
1693 #endif
1694 }
1695
1696 int cmd_main(int argc, const char **argv)
1697 {
1698         struct transfer_request *request;
1699         struct transfer_request *next_request;
1700         struct refspec rs = REFSPEC_INIT_PUSH;
1701         struct remote_lock *ref_lock = NULL;
1702         struct remote_lock *info_ref_lock = NULL;
1703         struct rev_info revs;
1704         int delete_branch = 0;
1705         int force_delete = 0;
1706         int objects_to_send;
1707         int rc = 0;
1708         int i;
1709         int new_refs;
1710         struct ref *ref, *local_refs;
1711
1712         repo = xcalloc(1, sizeof(*repo));
1713
1714         argv++;
1715         for (i = 1; i < argc; i++, argv++) {
1716                 const char *arg = *argv;
1717
1718                 if (*arg == '-') {
1719                         if (!strcmp(arg, "--all")) {
1720                                 push_all = MATCH_REFS_ALL;
1721                                 continue;
1722                         }
1723                         if (!strcmp(arg, "--force")) {
1724                                 force_all = 1;
1725                                 continue;
1726                         }
1727                         if (!strcmp(arg, "--dry-run")) {
1728                                 dry_run = 1;
1729                                 continue;
1730                         }
1731                         if (!strcmp(arg, "--helper-status")) {
1732                                 helper_status = 1;
1733                                 continue;
1734                         }
1735                         if (!strcmp(arg, "--verbose")) {
1736                                 push_verbosely = 1;
1737                                 http_is_verbose = 1;
1738                                 continue;
1739                         }
1740                         if (!strcmp(arg, "-d")) {
1741                                 delete_branch = 1;
1742                                 continue;
1743                         }
1744                         if (!strcmp(arg, "-D")) {
1745                                 delete_branch = 1;
1746                                 force_delete = 1;
1747                                 continue;
1748                         }
1749                         if (!strcmp(arg, "-h"))
1750                                 usage(http_push_usage);
1751                 }
1752                 if (!repo->url) {
1753                         char *path = strstr(arg, "//");
1754                         str_end_url_with_slash(arg, &repo->url);
1755                         repo->path_len = strlen(repo->url);
1756                         if (path) {
1757                                 repo->path = strchr(path+2, '/');
1758                                 if (repo->path)
1759                                         repo->path_len = strlen(repo->path);
1760                         }
1761                         continue;
1762                 }
1763                 refspec_appendn(&rs, argv, argc - i);
1764                 break;
1765         }
1766
1767 #ifndef USE_CURL_MULTI
1768         die("git-push is not available for http/https repository when not compiled with USE_CURL_MULTI");
1769 #endif
1770
1771         if (!repo->url)
1772                 usage(http_push_usage);
1773
1774         if (delete_branch && rs.nr != 1)
1775                 die("You must specify only one branch name when deleting a remote branch");
1776
1777         setup_git_directory();
1778
1779         memset(remote_dir_exists, -1, 256);
1780
1781         http_init(NULL, repo->url, 1);
1782
1783 #ifdef USE_CURL_MULTI
1784         is_running_queue = 0;
1785 #endif
1786
1787         /* Verify DAV compliance/lock support */
1788         if (!locking_available()) {
1789                 rc = 1;
1790                 goto cleanup;
1791         }
1792
1793         sigchain_push_common(remove_locks_on_signal);
1794
1795         /* Check whether the remote has server info files */
1796         repo->can_update_info_refs = 0;
1797         repo->has_info_refs = remote_exists("info/refs");
1798         repo->has_info_packs = remote_exists("objects/info/packs");
1799         if (repo->has_info_refs) {
1800                 info_ref_lock = lock_remote("info/refs", LOCK_TIME);
1801                 if (info_ref_lock)
1802                         repo->can_update_info_refs = 1;
1803                 else {
1804                         error("cannot lock existing info/refs");
1805                         rc = 1;
1806                         goto cleanup;
1807                 }
1808         }
1809         if (repo->has_info_packs)
1810                 fetch_indices();
1811
1812         /* Get a list of all local and remote heads to validate refspecs */
1813         local_refs = get_local_heads();
1814         fprintf(stderr, "Fetching remote heads...\n");
1815         get_dav_remote_heads();
1816         run_request_queue();
1817
1818         /* Remove a remote branch if -d or -D was specified */
1819         if (delete_branch) {
1820                 const char *branch = rs.items[i].src;
1821                 if (delete_remote_branch(branch, force_delete) == -1) {
1822                         fprintf(stderr, "Unable to delete remote branch %s\n",
1823                                 branch);
1824                         if (helper_status)
1825                                 printf("error %s cannot remove\n", branch);
1826                 }
1827                 goto cleanup;
1828         }
1829
1830         /* match them up */
1831         if (match_push_refs(local_refs, &remote_refs, &rs, push_all)) {
1832                 rc = -1;
1833                 goto cleanup;
1834         }
1835         if (!remote_refs) {
1836                 fprintf(stderr, "No refs in common and none specified; doing nothing.\n");
1837                 if (helper_status)
1838                         printf("error null no match\n");
1839                 rc = 0;
1840                 goto cleanup;
1841         }
1842
1843         new_refs = 0;
1844         for (ref = remote_refs; ref; ref = ref->next) {
1845                 struct argv_array commit_argv = ARGV_ARRAY_INIT;
1846
1847                 if (!ref->peer_ref)
1848                         continue;
1849
1850                 if (is_null_oid(&ref->peer_ref->new_oid)) {
1851                         if (delete_remote_branch(ref->name, 1) == -1) {
1852                                 error("Could not remove %s", ref->name);
1853                                 if (helper_status)
1854                                         printf("error %s cannot remove\n", ref->name);
1855                                 rc = -4;
1856                         }
1857                         else if (helper_status)
1858                                 printf("ok %s\n", ref->name);
1859                         new_refs++;
1860                         continue;
1861                 }
1862
1863                 if (oideq(&ref->old_oid, &ref->peer_ref->new_oid)) {
1864                         if (push_verbosely)
1865                                 fprintf(stderr, "'%s': up-to-date\n", ref->name);
1866                         if (helper_status)
1867                                 printf("ok %s up to date\n", ref->name);
1868                         continue;
1869                 }
1870
1871                 if (!force_all &&
1872                     !is_null_oid(&ref->old_oid) &&
1873                     !ref->force) {
1874                         if (!has_object_file(&ref->old_oid) ||
1875                             !ref_newer(&ref->peer_ref->new_oid,
1876                                        &ref->old_oid)) {
1877                                 /*
1878                                  * We do not have the remote ref, or
1879                                  * we know that the remote ref is not
1880                                  * an ancestor of what we are trying to
1881                                  * push.  Either way this can be losing
1882                                  * commits at the remote end and likely
1883                                  * we were not up to date to begin with.
1884                                  */
1885                                 error("remote '%s' is not an ancestor of\n"
1886                                       "local '%s'.\n"
1887                                       "Maybe you are not up-to-date and "
1888                                       "need to pull first?",
1889                                       ref->name,
1890                                       ref->peer_ref->name);
1891                                 if (helper_status)
1892                                         printf("error %s non-fast forward\n", ref->name);
1893                                 rc = -2;
1894                                 continue;
1895                         }
1896                 }
1897                 oidcpy(&ref->new_oid, &ref->peer_ref->new_oid);
1898                 new_refs++;
1899
1900                 fprintf(stderr, "updating '%s'", ref->name);
1901                 if (strcmp(ref->name, ref->peer_ref->name))
1902                         fprintf(stderr, " using '%s'", ref->peer_ref->name);
1903                 fprintf(stderr, "\n  from %s\n  to   %s\n",
1904                         oid_to_hex(&ref->old_oid), oid_to_hex(&ref->new_oid));
1905                 if (dry_run) {
1906                         if (helper_status)
1907                                 printf("ok %s\n", ref->name);
1908                         continue;
1909                 }
1910
1911                 /* Lock remote branch ref */
1912                 ref_lock = lock_remote(ref->name, LOCK_TIME);
1913                 if (ref_lock == NULL) {
1914                         fprintf(stderr, "Unable to lock remote branch %s\n",
1915                                 ref->name);
1916                         if (helper_status)
1917                                 printf("error %s lock error\n", ref->name);
1918                         rc = 1;
1919                         continue;
1920                 }
1921
1922                 /* Set up revision info for this refspec */
1923                 argv_array_push(&commit_argv, ""); /* ignored */
1924                 argv_array_push(&commit_argv, "--objects");
1925                 argv_array_push(&commit_argv, oid_to_hex(&ref->new_oid));
1926                 if (!push_all && !is_null_oid(&ref->old_oid))
1927                         argv_array_pushf(&commit_argv, "^%s",
1928                                          oid_to_hex(&ref->old_oid));
1929                 repo_init_revisions(the_repository, &revs, setup_git_directory());
1930                 setup_revisions(commit_argv.argc, commit_argv.argv, &revs, NULL);
1931                 revs.edge_hint = 0; /* just in case */
1932
1933                 /* Generate a list of objects that need to be pushed */
1934                 pushing = 0;
1935                 if (prepare_revision_walk(&revs))
1936                         die("revision walk setup failed");
1937                 mark_edges_uninteresting(&revs, NULL, 0);
1938                 objects_to_send = get_delta(&revs, ref_lock);
1939                 finish_all_active_slots();
1940
1941                 /* Push missing objects to remote, this would be a
1942                    convenient time to pack them first if appropriate. */
1943                 pushing = 1;
1944                 if (objects_to_send)
1945                         fprintf(stderr, "    sending %d objects\n",
1946                                 objects_to_send);
1947
1948                 run_request_queue();
1949
1950                 /* Update the remote branch if all went well */
1951                 if (aborted || !update_remote(&ref->new_oid, ref_lock))
1952                         rc = 1;
1953
1954                 if (!rc)
1955                         fprintf(stderr, "    done\n");
1956                 if (helper_status)
1957                         printf("%s %s\n", !rc ? "ok" : "error", ref->name);
1958                 unlock_remote(ref_lock);
1959                 check_locks();
1960                 argv_array_clear(&commit_argv);
1961         }
1962
1963         /* Update remote server info if appropriate */
1964         if (repo->has_info_refs && new_refs) {
1965                 if (info_ref_lock && repo->can_update_info_refs) {
1966                         fprintf(stderr, "Updating remote server info\n");
1967                         if (!dry_run)
1968                                 update_remote_info_refs(info_ref_lock);
1969                 } else {
1970                         fprintf(stderr, "Unable to update server info\n");
1971                 }
1972         }
1973
1974  cleanup:
1975         if (info_ref_lock)
1976                 unlock_remote(info_ref_lock);
1977         free(repo);
1978
1979         http_cleanup();
1980
1981         request = request_queue_head;
1982         while (request != NULL) {
1983                 next_request = request->next;
1984                 release_request(request);
1985                 request = next_request;
1986         }
1987
1988         return rc;
1989 }