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