git.oblomov.eu Git - git/blob - 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[41];
 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.hash);
 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", sha1_to_hex(target->sha1));
 319         fprintf(stderr, " which contains %s\n", oid_to_hex(&request->obj->oid));
 320
 321         preq = new_http_pack_request(target, repo->url);
 322         if (preq == NULL) {
 323                 repo->can_update_info_refs = 0;
 324                 return;
 325         }
 326         preq->lst = &repo->packs;
 327
 328         /* Make sure there isn't another open request for this pack */
 329         while (check_request) {
 330                 if (check_request->state == RUN_FETCH_PACKED &&
 331                     !strcmp(check_request->url, preq->url)) {
 332                         release_http_pack_request(preq);
 333                         release_request(request);
 334                         return;
 335                 }
 336                 check_request = check_request->next;
 337         }
 338
 339         preq->slot->callback_func = process_response;
 340         preq->slot->callback_data = request;
 341         request->slot = preq->slot;
 342         request->userData = preq;
 343
 344         /* Try to get the request started, abort the request on error */
 345         request->state = RUN_FETCH_PACKED;
 346         if (!start_active_slot(preq->slot)) {
 347                 fprintf(stderr, "Unable to start GET request\n");
 348                 release_http_pack_request(preq);
 349                 repo->can_update_info_refs = 0;
 350                 release_request(request);
 351         }
 352 }
 353
 354 static void start_put(struct transfer_request *request)
 355 {
 356         char *hex = oid_to_hex(&request->obj->oid);
 357         struct active_request_slot *slot;
 358         struct strbuf buf = STRBUF_INIT;
 359         enum object_type type;
 360         char hdr[50];
 361         void *unpacked;
 362         unsigned long len;
 363         int hdrlen;
 364         ssize_t size;
 365         git_zstream stream;
 366
 367         unpacked = read_object_file(&request->obj->oid, &type, &len);
 368         hdrlen = xsnprintf(hdr, sizeof(hdr), "%s %lu", type_name(type), len) + 1;
 369
 370         /* Set it up */
 371         git_deflate_init(&stream, zlib_compression_level);
 372         size = git_deflate_bound(&stream, len + hdrlen);
 373         strbuf_init(&request->buffer.buf, size);
 374         request->buffer.posn = 0;
 375
 376         /* Compress it */
 377         stream.next_out = (unsigned char *)request->buffer.buf.buf;
 378         stream.avail_out = size;
 379
 380         /* First header.. */
 381         stream.next_in = (void *)hdr;
 382         stream.avail_in = hdrlen;
 383         while (git_deflate(&stream, 0) == Z_OK)
 384                 ; /* nothing */
 385
 386         /* Then the data itself.. */
 387         stream.next_in = unpacked;
 388         stream.avail_in = len;
 389         while (git_deflate(&stream, Z_FINISH) == Z_OK)
 390                 ; /* nothing */
 391         git_deflate_end(&stream);
 392         free(unpacked);
 393
 394         request->buffer.buf.len = stream.total_out;
 395
 396         strbuf_addstr(&buf, "Destination: ");
 397         append_remote_object_url(&buf, repo->url, hex, 0);
 398         request->dest = strbuf_detach(&buf, NULL);
 399
 400         append_remote_object_url(&buf, repo->url, hex, 0);
 401         strbuf_add(&buf, request->lock->tmpfile_suffix, 41);
 402         request->url = strbuf_detach(&buf, NULL);
 403
 404         slot = get_active_slot();
 405         slot->callback_func = process_response;
 406         slot->callback_data = request;
 407         curl_setup_http(slot->curl, request->url, DAV_PUT,
 408                         &request->buffer, fwrite_null);
 409
 410         if (start_active_slot(slot)) {
 411                 request->slot = slot;
 412                 request->state = RUN_PUT;
 413         } else {
 414                 request->state = ABORTED;
 415                 FREE_AND_NULL(request->url);
 416         }
 417 }
 418
 419 static void start_move(struct transfer_request *request)
 420 {
 421         struct active_request_slot *slot;
 422         struct curl_slist *dav_headers = http_copy_default_headers();
 423
 424         slot = get_active_slot();
 425         slot->callback_func = process_response;
 426         slot->callback_data = request;
 427         curl_setup_http_get(slot->curl, request->url, DAV_MOVE);
 428         dav_headers = curl_slist_append(dav_headers, request->dest);
 429         dav_headers = curl_slist_append(dav_headers, "Overwrite: T");
 430         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
 431
 432         if (start_active_slot(slot)) {
 433                 request->slot = slot;
 434                 request->state = RUN_MOVE;
 435         } else {
 436                 request->state = ABORTED;
 437                 FREE_AND_NULL(request->url);
 438         }
 439 }
 440
 441 static int refresh_lock(struct remote_lock *lock)
 442 {
 443         struct active_request_slot *slot;
 444         struct slot_results results;
 445         struct curl_slist *dav_headers;
 446         int rc = 0;
 447
 448         lock->refreshing = 1;
 449
 450         dav_headers = get_dav_token_headers(lock, DAV_HEADER_IF | DAV_HEADER_TIMEOUT);
 451
 452         slot = get_active_slot();
 453         slot->results = &results;
 454         curl_setup_http_get(slot->curl, lock->url, DAV_LOCK);
 455         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
 456
 457         if (start_active_slot(slot)) {
 458                 run_active_slot(slot);
 459                 if (results.curl_result != CURLE_OK) {
 460                         fprintf(stderr, "LOCK HTTP error %ld\n",
 461                                 results.http_code);
 462                 } else {
 463                         lock->start_time = time(NULL);
 464                         rc = 1;
 465                 }
 466         }
 467
 468         lock->refreshing = 0;
 469         curl_slist_free_all(dav_headers);
 470
 471         return rc;
 472 }
 473
 474 static void check_locks(void)
 475 {
 476         struct remote_lock *lock = repo->locks;
 477         time_t current_time = time(NULL);
 478         int time_remaining;
 479
 480         while (lock) {
 481                 time_remaining = lock->start_time + lock->timeout -
 482                         current_time;
 483                 if (!lock->refreshing && time_remaining < LOCK_REFRESH) {
 484                         if (!refresh_lock(lock)) {
 485                                 fprintf(stderr,
 486                                         "Unable to refresh lock for %s\n",
 487                                         lock->url);
 488                                 aborted = 1;
 489                                 return;
 490                         }
 491                 }
 492                 lock = lock->next;
 493         }
 494 }
 495
 496 static void release_request(struct transfer_request *request)
 497 {
 498         struct transfer_request *entry = request_queue_head;
 499
 500         if (request == request_queue_head) {
 501                 request_queue_head = request->next;
 502         } else {
 503                 while (entry->next != NULL && entry->next != request)
 504                         entry = entry->next;
 505                 if (entry->next == request)
 506                         entry->next = entry->next->next;
 507         }
 508
 509         free(request->url);
 510         free(request);
 511 }
 512
 513 static void finish_request(struct transfer_request *request)
 514 {
 515         struct http_pack_request *preq;
 516         struct http_object_request *obj_req;
 517
 518         request->curl_result = request->slot->curl_result;
 519         request->http_code = request->slot->http_code;
 520         request->slot = NULL;
 521
 522         /* Keep locks active */
 523         check_locks();
 524
 525         if (request->headers != NULL)
 526                 curl_slist_free_all(request->headers);
 527
 528         /* URL is reused for MOVE after PUT */
 529         if (request->state != RUN_PUT) {
 530                 FREE_AND_NULL(request->url);
 531         }
 532
 533         if (request->state == RUN_MKCOL) {
 534                 if (request->curl_result == CURLE_OK ||
 535                     request->http_code == 405) {
 536                         remote_dir_exists[request->obj->oid.hash[0]] = 1;
 537                         start_put(request);
 538                 } else {
 539                         fprintf(stderr, "MKCOL %s failed, aborting (%d/%ld)\n",
 540                                 oid_to_hex(&request->obj->oid),
 541                                 request->curl_result, request->http_code);
 542                         request->state = ABORTED;
 543                         aborted = 1;
 544                 }
 545         } else if (request->state == RUN_PUT) {
 546                 if (request->curl_result == CURLE_OK) {
 547                         start_move(request);
 548                 } else {
 549                         fprintf(stderr, "PUT %s failed, aborting (%d/%ld)\n",
 550                                 oid_to_hex(&request->obj->oid),
 551                                 request->curl_result, request->http_code);
 552                         request->state = ABORTED;
 553                         aborted = 1;
 554                 }
 555         } else if (request->state == RUN_MOVE) {
 556                 if (request->curl_result == CURLE_OK) {
 557                         if (push_verbosely)
 558                                 fprintf(stderr, "    sent %s\n",
 559                                         oid_to_hex(&request->obj->oid));
 560                         request->obj->flags |= REMOTE;
 561                         release_request(request);
 562                 } else {
 563                         fprintf(stderr, "MOVE %s failed, aborting (%d/%ld)\n",
 564                                 oid_to_hex(&request->obj->oid),
 565                                 request->curl_result, request->http_code);
 566                         request->state = ABORTED;
 567                         aborted = 1;
 568                 }
 569         } else if (request->state == RUN_FETCH_LOOSE) {
 570                 obj_req = (struct http_object_request *)request->userData;
 571
 572                 if (finish_http_object_request(obj_req) == 0)
 573                         if (obj_req->rename == 0)
 574                                 request->obj->flags |= (LOCAL | REMOTE);
 575
 576                 /* Try fetching packed if necessary */
 577                 if (request->obj->flags & LOCAL) {
 578                         release_http_object_request(obj_req);
 579                         release_request(request);
 580                 } else
 581                         start_fetch_packed(request);
 582
 583         } else if (request->state == RUN_FETCH_PACKED) {
 584                 int fail = 1;
 585                 if (request->curl_result != CURLE_OK) {
 586                         fprintf(stderr, "Unable to get pack file %s\n%s",
 587                                 request->url, curl_errorstr);
 588                 } else {
 589                         preq = (struct http_pack_request *)request->userData;
 590
 591                         if (preq) {
 592                                 if (finish_http_pack_request(preq) == 0)
 593                                         fail = 0;
 594                                 release_http_pack_request(preq);
 595                         }
 596                 }
 597                 if (fail)
 598                         repo->can_update_info_refs = 0;
 599                 release_request(request);
 600         }
 601 }
 602
 603 #ifdef USE_CURL_MULTI
 604 static int is_running_queue;
 605 static int fill_active_slot(void *unused)
 606 {
 607         struct transfer_request *request;
 608
 609         if (aborted || !is_running_queue)
 610                 return 0;
 611
 612         for (request = request_queue_head; request; request = request->next) {
 613                 if (request->state == NEED_FETCH) {
 614                         start_fetch_loose(request);
 615                         return 1;
 616                 } else if (pushing && request->state == NEED_PUSH) {
 617                         if (remote_dir_exists[request->obj->oid.hash[0]] == 1) {
 618                                 start_put(request);
 619                         } else {
 620                                 start_mkcol(request);
 621                         }
 622                         return 1;
 623                 }
 624         }
 625         return 0;
 626 }
 627 #endif
 628
 629 static void get_remote_object_list(unsigned char parent);
 630
 631 static void add_fetch_request(struct object *obj)
 632 {
 633         struct transfer_request *request;
 634
 635         check_locks();
 636
 637         /*
 638          * Don't fetch the object if it's known to exist locally
 639          * or is already in the request queue
 640          */
 641         if (remote_dir_exists[obj->oid.hash[0]] == -1)
 642                 get_remote_object_list(obj->oid.hash[0]);
 643         if (obj->flags & (LOCAL | FETCHING))
 644                 return;
 645
 646         obj->flags |= FETCHING;
 647         request = xmalloc(sizeof(*request));
 648         request->obj = obj;
 649         request->url = NULL;
 650         request->lock = NULL;
 651         request->headers = NULL;
 652         request->state = NEED_FETCH;
 653         request->next = request_queue_head;
 654         request_queue_head = request;
 655
 656 #ifdef USE_CURL_MULTI
 657         fill_active_slots();
 658         step_active_slots();
 659 #endif
 660 }
 661
 662 static int add_send_request(struct object *obj, struct remote_lock *lock)
 663 {
 664         struct transfer_request *request;
 665         struct packed_git *target;
 666
 667         /* Keep locks active */
 668         check_locks();
 669
 670         /*
 671          * Don't push the object if it's known to exist on the remote
 672          * or is already in the request queue
 673          */
 674         if (remote_dir_exists[obj->oid.hash[0]] == -1)
 675                 get_remote_object_list(obj->oid.hash[0]);
 676         if (obj->flags & (REMOTE | PUSHING))
 677                 return 0;
 678         target = find_sha1_pack(obj->oid.hash, repo->packs);
 679         if (target) {
 680                 obj->flags |= REMOTE;
 681                 return 0;
 682         }
 683
 684         obj->flags |= PUSHING;
 685         request = xmalloc(sizeof(*request));
 686         request->obj = obj;
 687         request->url = NULL;
 688         request->lock = lock;
 689         request->headers = NULL;
 690         request->state = NEED_PUSH;
 691         request->next = request_queue_head;
 692         request_queue_head = request;
 693
 694 #ifdef USE_CURL_MULTI
 695         fill_active_slots();
 696         step_active_slots();
 697 #endif
 698
 699         return 1;
 700 }
 701
 702 static int fetch_indices(void)
 703 {
 704         int ret;
 705
 706         if (push_verbosely)
 707                 fprintf(stderr, "Getting pack list\n");
 708
 709         switch (http_get_info_packs(repo->url, &repo->packs)) {
 710         case HTTP_OK:
 711         case HTTP_MISSING_TARGET:
 712                 ret = 0;
 713                 break;
 714         default:
 715                 ret = -1;
 716         }
 717
 718         return ret;
 719 }
 720
 721 static void one_remote_object(const struct object_id *oid)
 722 {
 723         struct object *obj;
 724
 725         obj = lookup_object(the_repository, oid->hash);
 726         if (!obj)
 727                 obj = parse_object(the_repository, oid);
 728
 729         /* Ignore remote objects that don't exist locally */
 730         if (!obj)
 731                 return;
 732
 733         obj->flags |= REMOTE;
 734         if (!object_list_contains(objects, obj))
 735                 object_list_insert(obj, &objects);
 736 }
 737
 738 static void handle_lockprop_ctx(struct xml_ctx *ctx, int tag_closed)
 739 {
 740         int *lock_flags = (int *)ctx->userData;
 741
 742         if (tag_closed) {
 743                 if (!strcmp(ctx->name, DAV_CTX_LOCKENTRY)) {
 744                         if ((*lock_flags & DAV_PROP_LOCKEX) &&
 745                             (*lock_flags & DAV_PROP_LOCKWR)) {
 746                                 *lock_flags |= DAV_LOCK_OK;
 747                         }
 748                         *lock_flags &= DAV_LOCK_OK;
 749                 } else if (!strcmp(ctx->name, DAV_CTX_LOCKTYPE_WRITE)) {
 750                         *lock_flags |= DAV_PROP_LOCKWR;
 751                 } else if (!strcmp(ctx->name, DAV_CTX_LOCKTYPE_EXCLUSIVE)) {
 752                         *lock_flags |= DAV_PROP_LOCKEX;
 753                 }
 754         }
 755 }
 756
 757 static void handle_new_lock_ctx(struct xml_ctx *ctx, int tag_closed)
 758 {
 759         struct remote_lock *lock = (struct remote_lock *)ctx->userData;
 760         git_SHA_CTX sha_ctx;
 761         unsigned char lock_token_sha1[20];
 762
 763         if (tag_closed && ctx->cdata) {
 764                 if (!strcmp(ctx->name, DAV_ACTIVELOCK_OWNER)) {
 765                         lock->owner = xstrdup(ctx->cdata);
 766                 } else if (!strcmp(ctx->name, DAV_ACTIVELOCK_TIMEOUT)) {
 767                         const char *arg;
 768                         if (skip_prefix(ctx->cdata, "Second-", &arg))
 769                                 lock->timeout = strtol(arg, NULL, 10);
 770                 } else if (!strcmp(ctx->name, DAV_ACTIVELOCK_TOKEN)) {
 771                         lock->token = xstrdup(ctx->cdata);
 772
 773                         git_SHA1_Init(&sha_ctx);
 774                         git_SHA1_Update(&sha_ctx, lock->token, strlen(lock->token));
 775                         git_SHA1_Final(lock_token_sha1, &sha_ctx);
 776
 777                         lock->tmpfile_suffix[0] = '_';
 778                         memcpy(lock->tmpfile_suffix + 1, sha1_to_hex(lock_token_sha1), 40);
 779                 }
 780         }
 781 }
 782
 783 static void one_remote_ref(const char *refname);
 784
 785 static void
 786 xml_start_tag(void *userData, const char *name, const char **atts)
 787 {
 788         struct xml_ctx *ctx = (struct xml_ctx *)userData;
 789         const char *c = strchr(name, ':');
 790         int old_namelen, new_len;
 791
 792         if (c == NULL)
 793                 c = name;
 794         else
 795                 c++;
 796
 797         old_namelen = strlen(ctx->name);
 798         new_len = old_namelen + strlen(c) + 2;
 799
 800         if (new_len > ctx->len) {
 801                 ctx->name = xrealloc(ctx->name, new_len);
 802                 ctx->len = new_len;
 803         }
 804         xsnprintf(ctx->name + old_namelen, ctx->len - old_namelen, ".%s", c);
 805
 806         FREE_AND_NULL(ctx->cdata);
 807
 808         ctx->userFunc(ctx, 0);
 809 }
 810
 811 static void
 812 xml_end_tag(void *userData, const char *name)
 813 {
 814         struct xml_ctx *ctx = (struct xml_ctx *)userData;
 815         const char *c = strchr(name, ':');
 816         char *ep;
 817
 818         ctx->userFunc(ctx, 1);
 819
 820         if (c == NULL)
 821                 c = name;
 822         else
 823                 c++;
 824
 825         ep = ctx->name + strlen(ctx->name) - strlen(c) - 1;
 826         *ep = 0;
 827 }
 828
 829 static void
 830 xml_cdata(void *userData, const XML_Char *s, int len)
 831 {
 832         struct xml_ctx *ctx = (struct xml_ctx *)userData;
 833         free(ctx->cdata);
 834         ctx->cdata = xmemdupz(s, len);
 835 }
 836
 837 static struct remote_lock *lock_remote(const char *path, long timeout)
 838 {
 839         struct active_request_slot *slot;
 840         struct slot_results results;
 841         struct buffer out_buffer = { STRBUF_INIT, 0 };
 842         struct strbuf in_buffer = STRBUF_INIT;
 843         char *url;
 844         char *ep;
 845         char timeout_header[25];
 846         struct remote_lock *lock = NULL;
 847         struct curl_slist *dav_headers = http_copy_default_headers();
 848         struct xml_ctx ctx;
 849         char *escaped;
 850
 851         url = xstrfmt("%s%s", repo->url, path);
 852
 853         /* Make sure leading directories exist for the remote ref */
 854         ep = strchr(url + strlen(repo->url) + 1, '/');
 855         while (ep) {
 856                 char saved_character = ep[1];
 857                 ep[1] = '\0';
 858                 slot = get_active_slot();
 859                 slot->results = &results;
 860                 curl_setup_http_get(slot->curl, url, DAV_MKCOL);
 861                 if (start_active_slot(slot)) {
 862                         run_active_slot(slot);
 863                         if (results.curl_result != CURLE_OK &&
 864                             results.http_code != 405) {
 865                                 fprintf(stderr,
 866                                         "Unable to create branch path %s\n",
 867                                         url);
 868                                 free(url);
 869                                 return NULL;
 870                         }
 871                 } else {
 872                         fprintf(stderr, "Unable to start MKCOL request\n");
 873                         free(url);
 874                         return NULL;
 875                 }
 876                 ep[1] = saved_character;
 877                 ep = strchr(ep + 1, '/');
 878         }
 879
 880         escaped = xml_entities(ident_default_email());
 881         strbuf_addf(&out_buffer.buf, LOCK_REQUEST, escaped);
 882         free(escaped);
 883
 884         xsnprintf(timeout_header, sizeof(timeout_header), "Timeout: Second-%ld", timeout);
 885         dav_headers = curl_slist_append(dav_headers, timeout_header);
 886         dav_headers = curl_slist_append(dav_headers, "Content-Type: text/xml");
 887
 888         slot = get_active_slot();
 889         slot->results = &results;
 890         curl_setup_http(slot->curl, url, DAV_LOCK, &out_buffer, fwrite_buffer);
 891         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
 892         curl_easy_setopt(slot->curl, CURLOPT_FILE, &in_buffer);
 893
 894         lock = xcalloc(1, sizeof(*lock));
 895         lock->timeout = -1;
 896
 897         if (start_active_slot(slot)) {
 898                 run_active_slot(slot);
 899                 if (results.curl_result == CURLE_OK) {
 900                         XML_Parser parser = XML_ParserCreate(NULL);
 901                         enum XML_Status result;
 902                         ctx.name = xcalloc(10, 1);
 903                         ctx.len = 0;
 904                         ctx.cdata = NULL;
 905                         ctx.userFunc = handle_new_lock_ctx;
 906                         ctx.userData = lock;
 907                         XML_SetUserData(parser, &ctx);
 908                         XML_SetElementHandler(parser, xml_start_tag,
 909                                               xml_end_tag);
 910                         XML_SetCharacterDataHandler(parser, xml_cdata);
 911                         result = XML_Parse(parser, in_buffer.buf,
 912                                            in_buffer.len, 1);
 913                         free(ctx.name);
 914                         if (result != XML_STATUS_OK) {
 915                                 fprintf(stderr, "XML error: %s\n",
 916                                         XML_ErrorString(
 917                                                 XML_GetErrorCode(parser)));
 918                                 lock->timeout = -1;
 919                         }
 920                         XML_ParserFree(parser);
 921                 } else {
 922                         fprintf(stderr,
 923                                 "error: curl result=%d, HTTP code=%ld\n",
 924                                 results.curl_result, results.http_code);
 925                 }
 926         } else {
 927                 fprintf(stderr, "Unable to start LOCK request\n");
 928         }
 929
 930         curl_slist_free_all(dav_headers);
 931         strbuf_release(&out_buffer.buf);
 932         strbuf_release(&in_buffer);
 933
 934         if (lock->token == NULL || lock->timeout <= 0) {
 935                 free(lock->token);
 936                 free(lock->owner);
 937                 free(url);
 938                 FREE_AND_NULL(lock);
 939         } else {
 940                 lock->url = url;
 941                 lock->start_time = time(NULL);
 942                 lock->next = repo->locks;
 943                 repo->locks = lock;
 944         }
 945
 946         return lock;
 947 }
 948
 949 static int unlock_remote(struct remote_lock *lock)
 950 {
 951         struct active_request_slot *slot;
 952         struct slot_results results;
 953         struct remote_lock *prev = repo->locks;
 954         struct curl_slist *dav_headers;
 955         int rc = 0;
 956
 957         dav_headers = get_dav_token_headers(lock, DAV_HEADER_LOCK);
 958
 959         slot = get_active_slot();
 960         slot->results = &results;
 961         curl_setup_http_get(slot->curl, lock->url, DAV_UNLOCK);
 962         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
 963
 964         if (start_active_slot(slot)) {
 965                 run_active_slot(slot);
 966                 if (results.curl_result == CURLE_OK)
 967                         rc = 1;
 968                 else
 969                         fprintf(stderr, "UNLOCK HTTP error %ld\n",
 970                                 results.http_code);
 971         } else {
 972                 fprintf(stderr, "Unable to start UNLOCK request\n");
 973         }
 974
 975         curl_slist_free_all(dav_headers);
 976
 977         if (repo->locks == lock) {
 978                 repo->locks = lock->next;
 979         } else {
 980                 while (prev && prev->next != lock)
 981                         prev = prev->next;
 982                 if (prev)
 983                         prev->next = prev->next->next;
 984         }
 985
 986         free(lock->owner);
 987         free(lock->url);
 988         free(lock->token);
 989         free(lock);
 990
 991         return rc;
 992 }
 993
 994 static void remove_locks(void)
 995 {
 996         struct remote_lock *lock = repo->locks;
 997
 998         fprintf(stderr, "Removing remote locks...\n");
 999         while (lock) {
1000                 struct remote_lock *next = lock->next;
1001                 unlock_remote(lock);
1002                 lock = next;
1003         }
1004 }
1005
1006 static void remove_locks_on_signal(int signo)
1007 {
1008         remove_locks();
1009         sigchain_pop(signo);
1010         raise(signo);
1011 }
1012
1013 static void remote_ls(const char *path, int flags,
1014                       void (*userFunc)(struct remote_ls_ctx *ls),
1015                       void *userData);
1016
1017 /* extract hex from sharded "xx/x{38}" filename */
1018 static int get_oid_hex_from_objpath(const char *path, struct object_id *oid)
1019 {
1020         if (strlen(path) != GIT_SHA1_HEXSZ + 1)
1021                 return -1;
1022
1023         if (hex_to_bytes(oid->hash, path, 1))
1024                 return -1;
1025         path += 2;
1026         path++; /* skip '/' */
1027
1028         return hex_to_bytes(oid->hash + 1, path, GIT_SHA1_RAWSZ - 1);
1029 }
1030
1031 static void process_ls_object(struct remote_ls_ctx *ls)
1032 {
1033         unsigned int *parent = (unsigned int *)ls->userData;
1034         const char *path = ls->dentry_name;
1035         struct object_id oid;
1036
1037         if (!strcmp(ls->path, ls->dentry_name) && (ls->flags & IS_DIR)) {
1038                 remote_dir_exists[*parent] = 1;
1039                 return;
1040         }
1041
1042         if (!skip_prefix(path, "objects/", &path) ||
1043             get_oid_hex_from_objpath(path, &oid))
1044                 return;
1045
1046         one_remote_object(&oid);
1047 }
1048
1049 static void process_ls_ref(struct remote_ls_ctx *ls)
1050 {
1051         if (!strcmp(ls->path, ls->dentry_name) && (ls->dentry_flags & IS_DIR)) {
1052                 fprintf(stderr, "  %s\n", ls->dentry_name);
1053                 return;
1054         }
1055
1056         if (!(ls->dentry_flags & IS_DIR))
1057                 one_remote_ref(ls->dentry_name);
1058 }
1059
1060 static void handle_remote_ls_ctx(struct xml_ctx *ctx, int tag_closed)
1061 {
1062         struct remote_ls_ctx *ls = (struct remote_ls_ctx *)ctx->userData;
1063
1064         if (tag_closed) {
1065                 if (!strcmp(ctx->name, DAV_PROPFIND_RESP) && ls->dentry_name) {
1066                         if (ls->dentry_flags & IS_DIR) {
1067
1068                                 /* ensure collection names end with slash */
1069                                 str_end_url_with_slash(ls->dentry_name, &ls->dentry_name);
1070
1071                                 if (ls->flags & PROCESS_DIRS) {
1072                                         ls->userFunc(ls);
1073                                 }
1074                                 if (strcmp(ls->dentry_name, ls->path) &&
1075                                     ls->flags & RECURSIVE) {
1076                                         remote_ls(ls->dentry_name,
1077                                                   ls->flags,
1078                                                   ls->userFunc,
1079                                                   ls->userData);
1080                                 }
1081                         } else if (ls->flags & PROCESS_FILES) {
1082                                 ls->userFunc(ls);
1083                         }
1084                 } else if (!strcmp(ctx->name, DAV_PROPFIND_NAME) && ctx->cdata) {
1085                         char *path = ctx->cdata;
1086                         if (*ctx->cdata == 'h') {
1087                                 path = strstr(path, "//");
1088                                 if (path) {
1089                                         path = strchr(path+2, '/');
1090                                 }
1091                         }
1092                         if (path) {
1093                                 const char *url = repo->url;
1094                                 if (repo->path)
1095                                         url = repo->path;
1096                                 if (strncmp(path, url, repo->path_len))
1097                                         error("Parsed path '%s' does not match url: '%s'",
1098                                               path, url);
1099                                 else {
1100                                         path += repo->path_len;
1101                                         ls->dentry_name = xstrdup(path);
1102                                 }
1103                         }
1104                 } else if (!strcmp(ctx->name, DAV_PROPFIND_COLLECTION)) {
1105                         ls->dentry_flags |= IS_DIR;
1106                 }
1107         } else if (!strcmp(ctx->name, DAV_PROPFIND_RESP)) {
1108                 FREE_AND_NULL(ls->dentry_name);
1109                 ls->dentry_flags = 0;
1110         }
1111 }
1112
1113 /*
1114  * NEEDSWORK: remote_ls() ignores info/refs on the remote side.  But it
1115  * should _only_ heed the information from that file, instead of trying to
1116  * determine the refs from the remote file system (badly: it does not even
1117  * know about packed-refs).
1118  */
1119 static void remote_ls(const char *path, int flags,
1120                       void (*userFunc)(struct remote_ls_ctx *ls),
1121                       void *userData)
1122 {
1123         char *url = xstrfmt("%s%s", repo->url, path);
1124         struct active_request_slot *slot;
1125         struct slot_results results;
1126         struct strbuf in_buffer = STRBUF_INIT;
1127         struct buffer out_buffer = { STRBUF_INIT, 0 };
1128         struct curl_slist *dav_headers = http_copy_default_headers();
1129         struct xml_ctx ctx;
1130         struct remote_ls_ctx ls;
1131
1132         ls.flags = flags;
1133         ls.path = xstrdup(path);
1134         ls.dentry_name = NULL;
1135         ls.dentry_flags = 0;
1136         ls.userData = userData;
1137         ls.userFunc = userFunc;
1138
1139         strbuf_addstr(&out_buffer.buf, PROPFIND_ALL_REQUEST);
1140
1141         dav_headers = curl_slist_append(dav_headers, "Depth: 1");
1142         dav_headers = curl_slist_append(dav_headers, "Content-Type: text/xml");
1143
1144         slot = get_active_slot();
1145         slot->results = &results;
1146         curl_setup_http(slot->curl, url, DAV_PROPFIND,
1147                         &out_buffer, fwrite_buffer);
1148         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
1149         curl_easy_setopt(slot->curl, CURLOPT_FILE, &in_buffer);
1150
1151         if (start_active_slot(slot)) {
1152                 run_active_slot(slot);
1153                 if (results.curl_result == CURLE_OK) {
1154                         XML_Parser parser = XML_ParserCreate(NULL);
1155                         enum XML_Status result;
1156                         ctx.name = xcalloc(10, 1);
1157                         ctx.len = 0;
1158                         ctx.cdata = NULL;
1159                         ctx.userFunc = handle_remote_ls_ctx;
1160                         ctx.userData = &ls;
1161                         XML_SetUserData(parser, &ctx);
1162                         XML_SetElementHandler(parser, xml_start_tag,
1163                                               xml_end_tag);
1164                         XML_SetCharacterDataHandler(parser, xml_cdata);
1165                         result = XML_Parse(parser, in_buffer.buf,
1166                                            in_buffer.len, 1);
1167                         free(ctx.name);
1168
1169                         if (result != XML_STATUS_OK) {
1170                                 fprintf(stderr, "XML error: %s\n",
1171                                         XML_ErrorString(
1172                                                 XML_GetErrorCode(parser)));
1173                         }
1174                         XML_ParserFree(parser);
1175                 }
1176         } else {
1177                 fprintf(stderr, "Unable to start PROPFIND request\n");
1178         }
1179
1180         free(ls.path);
1181         free(url);
1182         strbuf_release(&out_buffer.buf);
1183         strbuf_release(&in_buffer);
1184         curl_slist_free_all(dav_headers);
1185 }
1186
1187 static void get_remote_object_list(unsigned char parent)
1188 {
1189         char path[] = "objects/XX/";
1190         static const char hex[] = "0123456789abcdef";
1191         unsigned int val = parent;
1192
1193         path[8] = hex[val >> 4];
1194         path[9] = hex[val & 0xf];
1195         remote_dir_exists[val] = 0;
1196         remote_ls(path, (PROCESS_FILES | PROCESS_DIRS),
1197                   process_ls_object, &val);
1198 }
1199
1200 static int locking_available(void)
1201 {
1202         struct active_request_slot *slot;
1203         struct slot_results results;
1204         struct strbuf in_buffer = STRBUF_INIT;
1205         struct buffer out_buffer = { STRBUF_INIT, 0 };
1206         struct curl_slist *dav_headers = http_copy_default_headers();
1207         struct xml_ctx ctx;
1208         int lock_flags = 0;
1209         char *escaped;
1210
1211         escaped = xml_entities(repo->url);
1212         strbuf_addf(&out_buffer.buf, PROPFIND_SUPPORTEDLOCK_REQUEST, escaped);
1213         free(escaped);
1214
1215         dav_headers = curl_slist_append(dav_headers, "Depth: 0");
1216         dav_headers = curl_slist_append(dav_headers, "Content-Type: text/xml");
1217
1218         slot = get_active_slot();
1219         slot->results = &results;
1220         curl_setup_http(slot->curl, repo->url, DAV_PROPFIND,
1221                         &out_buffer, fwrite_buffer);
1222         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
1223         curl_easy_setopt(slot->curl, CURLOPT_FILE, &in_buffer);
1224
1225         if (start_active_slot(slot)) {
1226                 run_active_slot(slot);
1227                 if (results.curl_result == CURLE_OK) {
1228                         XML_Parser parser = XML_ParserCreate(NULL);
1229                         enum XML_Status result;
1230                         ctx.name = xcalloc(10, 1);
1231                         ctx.len = 0;
1232                         ctx.cdata = NULL;
1233                         ctx.userFunc = handle_lockprop_ctx;
1234                         ctx.userData = &lock_flags;
1235                         XML_SetUserData(parser, &ctx);
1236                         XML_SetElementHandler(parser, xml_start_tag,
1237                                               xml_end_tag);
1238                         result = XML_Parse(parser, in_buffer.buf,
1239                                            in_buffer.len, 1);
1240                         free(ctx.name);
1241
1242                         if (result != XML_STATUS_OK) {
1243                                 fprintf(stderr, "XML error: %s\n",
1244                                         XML_ErrorString(
1245                                                 XML_GetErrorCode(parser)));
1246                                 lock_flags = 0;
1247                         }
1248                         XML_ParserFree(parser);
1249                         if (!lock_flags)
1250                                 error("no DAV locking support on %s",
1251                                       repo->url);
1252
1253                 } else {
1254                         error("Cannot access URL %s, return code %d",
1255                               repo->url, results.curl_result);
1256                         lock_flags = 0;
1257                 }
1258         } else {
1259                 error("Unable to start PROPFIND request on %s", repo->url);
1260         }
1261
1262         strbuf_release(&out_buffer.buf);
1263         strbuf_release(&in_buffer);
1264         curl_slist_free_all(dav_headers);
1265
1266         return lock_flags;
1267 }
1268
1269 static struct object_list **add_one_object(struct object *obj, struct object_list **p)
1270 {
1271         struct object_list *entry = xmalloc(sizeof(struct object_list));
1272         entry->item = obj;
1273         entry->next = *p;
1274         *p = entry;
1275         return &entry->next;
1276 }
1277
1278 static struct object_list **process_blob(struct blob *blob,
1279                                          struct object_list **p)
1280 {
1281         struct object *obj = &blob->object;
1282
1283         obj->flags |= LOCAL;
1284
1285         if (obj->flags & (UNINTERESTING | SEEN))
1286                 return p;
1287
1288         obj->flags |= SEEN;
1289         return add_one_object(obj, p);
1290 }
1291
1292 static struct object_list **process_tree(struct tree *tree,
1293                                          struct object_list **p)
1294 {
1295         struct object *obj = &tree->object;
1296         struct tree_desc desc;
1297         struct name_entry entry;
1298
1299         obj->flags |= LOCAL;
1300
1301         if (obj->flags & (UNINTERESTING | SEEN))
1302                 return p;
1303         if (parse_tree(tree) < 0)
1304                 die("bad tree object %s", oid_to_hex(&obj->oid));
1305
1306         obj->flags |= SEEN;
1307         p = add_one_object(obj, p);
1308
1309         init_tree_desc(&desc, tree->buffer, tree->size);
1310
1311         while (tree_entry(&desc, &entry))
1312                 switch (object_type(entry.mode)) {
1313                 case OBJ_TREE:
1314                         p = process_tree(lookup_tree(the_repository, entry.oid),
1315                                          p);
1316                         break;
1317                 case OBJ_BLOB:
1318                         p = process_blob(lookup_blob(the_repository, entry.oid),
1319                                          p);
1320                         break;
1321                 default:
1322                         /* Subproject commit - not in this repository */
1323                         break;
1324                 }
1325
1326         free_tree_buffer(tree);
1327         return p;
1328 }
1329
1330 static int get_delta(struct rev_info *revs, struct remote_lock *lock)
1331 {
1332         int i;
1333         struct commit *commit;
1334         struct object_list **p = &objects;
1335         int count = 0;
1336
1337         while ((commit = get_revision(revs)) != NULL) {
1338                 p = process_tree(get_commit_tree(commit), p);
1339                 commit->object.flags |= LOCAL;
1340                 if (!(commit->object.flags & UNINTERESTING))
1341                         count += add_send_request(&commit->object, lock);
1342         }
1343
1344         for (i = 0; i < revs->pending.nr; i++) {
1345                 struct object_array_entry *entry = revs->pending.objects + i;
1346                 struct object *obj = entry->item;
1347                 const char *name = entry->name;
1348
1349                 if (obj->flags & (UNINTERESTING | SEEN))
1350                         continue;
1351                 if (obj->type == OBJ_TAG) {
1352                         obj->flags |= SEEN;
1353                         p = add_one_object(obj, p);
1354                         continue;
1355                 }
1356                 if (obj->type == OBJ_TREE) {
1357                         p = process_tree((struct tree *)obj, p);
1358                         continue;
1359                 }
1360                 if (obj->type == OBJ_BLOB) {
1361                         p = process_blob((struct blob *)obj, p);
1362                         continue;
1363                 }
1364                 die("unknown pending object %s (%s)", oid_to_hex(&obj->oid), name);
1365         }
1366
1367         while (objects) {
1368                 if (!(objects->item->flags & UNINTERESTING))
1369                         count += add_send_request(objects->item, lock);
1370                 objects = objects->next;
1371         }
1372
1373         return count;
1374 }
1375
1376 static int update_remote(unsigned char *sha1, struct remote_lock *lock)
1377 {
1378         struct active_request_slot *slot;
1379         struct slot_results results;
1380         struct buffer out_buffer = { STRBUF_INIT, 0 };
1381         struct curl_slist *dav_headers;
1382
1383         dav_headers = get_dav_token_headers(lock, DAV_HEADER_IF);
1384
1385         strbuf_addf(&out_buffer.buf, "%s\n", sha1_to_hex(sha1));
1386
1387         slot = get_active_slot();
1388         slot->results = &results;
1389         curl_setup_http(slot->curl, lock->url, DAV_PUT,
1390                         &out_buffer, fwrite_null);
1391         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
1392
1393         if (start_active_slot(slot)) {
1394                 run_active_slot(slot);
1395                 strbuf_release(&out_buffer.buf);
1396                 if (results.curl_result != CURLE_OK) {
1397                         fprintf(stderr,
1398                                 "PUT error: curl result=%d, HTTP code=%ld\n",
1399                                 results.curl_result, results.http_code);
1400                         /* We should attempt recovery? */
1401                         return 0;
1402                 }
1403         } else {
1404                 strbuf_release(&out_buffer.buf);
1405                 fprintf(stderr, "Unable to start PUT request\n");
1406                 return 0;
1407         }
1408
1409         return 1;
1410 }
1411
1412 static struct ref *remote_refs;
1413
1414 static void one_remote_ref(const char *refname)
1415 {
1416         struct ref *ref;
1417         struct object *obj;
1418
1419         ref = alloc_ref(refname);
1420
1421         if (http_fetch_ref(repo->url, ref) != 0) {
1422                 fprintf(stderr,
1423                         "Unable to fetch ref %s from %s\n",
1424                         refname, repo->url);
1425                 free(ref);
1426                 return;
1427         }
1428
1429         /*
1430          * Fetch a copy of the object if it doesn't exist locally - it
1431          * may be required for updating server info later.
1432          */
1433         if (repo->can_update_info_refs && !has_object_file(&ref->old_oid)) {
1434                 obj = lookup_unknown_object(ref->old_oid.hash);
1435                 fprintf(stderr, "  fetch %s for %s\n",
1436                         oid_to_hex(&ref->old_oid), refname);
1437                 add_fetch_request(obj);
1438         }
1439
1440         ref->next = remote_refs;
1441         remote_refs = ref;
1442 }
1443
1444 static void get_dav_remote_heads(void)
1445 {
1446         remote_ls("refs/", (PROCESS_FILES | PROCESS_DIRS | RECURSIVE), process_ls_ref, NULL);
1447 }
1448
1449 static void add_remote_info_ref(struct remote_ls_ctx *ls)
1450 {
1451         struct strbuf *buf = (struct strbuf *)ls->userData;
1452         struct object *o;
1453         struct ref *ref;
1454
1455         ref = alloc_ref(ls->dentry_name);
1456
1457         if (http_fetch_ref(repo->url, ref) != 0) {
1458                 fprintf(stderr,
1459                         "Unable to fetch ref %s from %s\n",
1460                         ls->dentry_name, repo->url);
1461                 aborted = 1;
1462                 free(ref);
1463                 return;
1464         }
1465
1466         o = parse_object(the_repository, &ref->old_oid);
1467         if (!o) {
1468                 fprintf(stderr,
1469                         "Unable to parse object %s for remote ref %s\n",
1470                         oid_to_hex(&ref->old_oid), ls->dentry_name);
1471                 aborted = 1;
1472                 free(ref);
1473                 return;
1474         }
1475
1476         strbuf_addf(buf, "%s\t%s\n",
1477                     oid_to_hex(&ref->old_oid), ls->dentry_name);
1478
1479         if (o->type == OBJ_TAG) {
1480                 o = deref_tag(the_repository, o, ls->dentry_name, 0);
1481                 if (o)
1482                         strbuf_addf(buf, "%s\t%s^{}\n",
1483                                     oid_to_hex(&o->oid), ls->dentry_name);
1484         }
1485         free(ref);
1486 }
1487
1488 static void update_remote_info_refs(struct remote_lock *lock)
1489 {
1490         struct buffer buffer = { STRBUF_INIT, 0 };
1491         struct active_request_slot *slot;
1492         struct slot_results results;
1493         struct curl_slist *dav_headers;
1494
1495         remote_ls("refs/", (PROCESS_FILES | RECURSIVE),
1496                   add_remote_info_ref, &buffer.buf);
1497         if (!aborted) {
1498                 dav_headers = get_dav_token_headers(lock, DAV_HEADER_IF);
1499
1500                 slot = get_active_slot();
1501                 slot->results = &results;
1502                 curl_setup_http(slot->curl, lock->url, DAV_PUT,
1503                                 &buffer, fwrite_null);
1504                 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
1505
1506                 if (start_active_slot(slot)) {
1507                         run_active_slot(slot);
1508                         if (results.curl_result != CURLE_OK) {
1509                                 fprintf(stderr,
1510                                         "PUT error: curl result=%d, HTTP code=%ld\n",
1511                                         results.curl_result, results.http_code);
1512                         }
1513                 }
1514         }
1515         strbuf_release(&buffer.buf);
1516 }
1517
1518 static int remote_exists(const char *path)
1519 {
1520         char *url = xstrfmt("%s%s", repo->url, path);
1521         int ret;
1522
1523
1524         switch (http_get_strbuf(url, NULL, NULL)) {
1525         case HTTP_OK:
1526                 ret = 1;
1527                 break;
1528         case HTTP_MISSING_TARGET:
1529                 ret = 0;
1530                 break;
1531         case HTTP_ERROR:
1532                 error("unable to access '%s': %s", url, curl_errorstr);
1533                 /* fallthrough */
1534         default:
1535                 ret = -1;
1536         }
1537         free(url);
1538         return ret;
1539 }
1540
1541 static void fetch_symref(const char *path, char **symref, struct object_id *oid)
1542 {
1543         char *url = xstrfmt("%s%s", repo->url, path);
1544         struct strbuf buffer = STRBUF_INIT;
1545         const char *name;
1546
1547         if (http_get_strbuf(url, &buffer, NULL) != HTTP_OK)
1548                 die("Couldn't get %s for remote symref\n%s", url,
1549                     curl_errorstr);
1550         free(url);
1551
1552         FREE_AND_NULL(*symref);
1553         oidclr(oid);
1554
1555         if (buffer.len == 0)
1556                 return;
1557
1558         /* Cut off trailing newline. */
1559         strbuf_rtrim(&buffer);
1560
1561         /* If it's a symref, set the refname; otherwise try for a sha1 */
1562         if (skip_prefix(buffer.buf, "ref: ", &name)) {
1563                 *symref = xmemdupz(name, buffer.len - (name - buffer.buf));
1564         } else {
1565                 get_oid_hex(buffer.buf, oid);
1566         }
1567
1568         strbuf_release(&buffer);
1569 }
1570
1571 static int verify_merge_base(struct object_id *head_oid, struct ref *remote)
1572 {
1573         struct commit *head = lookup_commit_or_die(head_oid, "HEAD");
1574         struct commit *branch = lookup_commit_or_die(&remote->old_oid,
1575                                                      remote->name);
1576
1577         return in_merge_bases(branch, head);
1578 }
1579
1580 static int delete_remote_branch(const char *pattern, int force)
1581 {
1582         struct ref *refs = remote_refs;
1583         struct ref *remote_ref = NULL;
1584         struct object_id head_oid;
1585         char *symref = NULL;
1586         int match;
1587         int patlen = strlen(pattern);
1588         int i;
1589         struct active_request_slot *slot;
1590         struct slot_results results;
1591         char *url;
1592
1593         /* Find the remote branch(es) matching the specified branch name */
1594         for (match = 0; refs; refs = refs->next) {
1595                 char *name = refs->name;
1596                 int namelen = strlen(name);
1597                 if (namelen < patlen ||
1598                     memcmp(name + namelen - patlen, pattern, patlen))
1599                         continue;
1600                 if (namelen != patlen && name[namelen - patlen - 1] != '/')
1601                         continue;
1602                 match++;
1603                 remote_ref = refs;
1604         }
1605         if (match == 0)
1606                 return error("No remote branch matches %s", pattern);
1607         if (match != 1)
1608                 return error("More than one remote branch matches %s",
1609                              pattern);
1610
1611         /*
1612          * Remote HEAD must be a symref (not exactly foolproof; a remote
1613          * symlink to a symref will look like a symref)
1614          */
1615         fetch_symref("HEAD", &symref, &head_oid);
1616         if (!symref)
1617                 return error("Remote HEAD is not a symref");
1618
1619         /* Remote branch must not be the remote HEAD */
1620         for (i = 0; symref && i < MAXDEPTH; i++) {
1621                 if (!strcmp(remote_ref->name, symref))
1622                         return error("Remote branch %s is the current HEAD",
1623                                      remote_ref->name);
1624                 fetch_symref(symref, &symref, &head_oid);
1625         }
1626
1627         /* Run extra sanity checks if delete is not forced */
1628         if (!force) {
1629                 /* Remote HEAD must resolve to a known object */
1630                 if (symref)
1631                         return error("Remote HEAD symrefs too deep");
1632                 if (is_null_oid(&head_oid))
1633                         return error("Unable to resolve remote HEAD");
1634                 if (!has_object_file(&head_oid))
1635                         return error("Remote HEAD resolves to object %s\nwhich does not exist locally, perhaps you need to fetch?", oid_to_hex(&head_oid));
1636
1637                 /* Remote branch must resolve to a known object */
1638                 if (is_null_oid(&remote_ref->old_oid))
1639                         return error("Unable to resolve remote branch %s",
1640                                      remote_ref->name);
1641                 if (!has_object_file(&remote_ref->old_oid))
1642                         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));
1643
1644                 /* Remote branch must be an ancestor of remote HEAD */
1645                 if (!verify_merge_base(&head_oid, remote_ref)) {
1646                         return error("The branch '%s' is not an ancestor "
1647                                      "of your current HEAD.\n"
1648                                      "If you are sure you want to delete it,"
1649                                      " run:\n\t'git http-push -D %s %s'",
1650                                      remote_ref->name, repo->url, pattern);
1651                 }
1652         }
1653
1654         /* Send delete request */
1655         fprintf(stderr, "Removing remote branch '%s'\n", remote_ref->name);
1656         if (dry_run)
1657                 return 0;
1658         url = xstrfmt("%s%s", repo->url, remote_ref->name);
1659         slot = get_active_slot();
1660         slot->results = &results;
1661         curl_setup_http_get(slot->curl, url, DAV_DELETE);
1662         if (start_active_slot(slot)) {
1663                 run_active_slot(slot);
1664                 free(url);
1665                 if (results.curl_result != CURLE_OK)
1666                         return error("DELETE request failed (%d/%ld)",
1667                                      results.curl_result, results.http_code);
1668         } else {
1669                 free(url);
1670                 return error("Unable to start DELETE request");
1671         }
1672
1673         return 0;
1674 }
1675
1676 static void run_request_queue(void)
1677 {
1678 #ifdef USE_CURL_MULTI
1679         is_running_queue = 1;
1680         fill_active_slots();
1681         add_fill_function(NULL, fill_active_slot);
1682 #endif
1683         do {
1684                 finish_all_active_slots();
1685 #ifdef USE_CURL_MULTI
1686                 fill_active_slots();
1687 #endif
1688         } while (request_queue_head && !aborted);
1689
1690 #ifdef USE_CURL_MULTI
1691         is_running_queue = 0;
1692 #endif
1693 }
1694
1695 int cmd_main(int argc, const char **argv)
1696 {
1697         struct transfer_request *request;
1698         struct transfer_request *next_request;
1699         struct refspec rs = REFSPEC_INIT_PUSH;
1700         struct remote_lock *ref_lock = NULL;
1701         struct remote_lock *info_ref_lock = NULL;
1702         struct rev_info revs;
1703         int delete_branch = 0;
1704         int force_delete = 0;
1705         int objects_to_send;
1706         int rc = 0;
1707         int i;
1708         int new_refs;
1709         struct ref *ref, *local_refs;
1710
1711         repo = xcalloc(1, sizeof(*repo));
1712
1713         argv++;
1714         for (i = 1; i < argc; i++, argv++) {
1715                 const char *arg = *argv;
1716
1717                 if (*arg == '-') {
1718                         if (!strcmp(arg, "--all")) {
1719                                 push_all = MATCH_REFS_ALL;
1720                                 continue;
1721                         }
1722                         if (!strcmp(arg, "--force")) {
1723                                 force_all = 1;
1724                                 continue;
1725                         }
1726                         if (!strcmp(arg, "--dry-run")) {
1727                                 dry_run = 1;
1728                                 continue;
1729                         }
1730                         if (!strcmp(arg, "--helper-status")) {
1731                                 helper_status = 1;
1732                                 continue;
1733                         }
1734                         if (!strcmp(arg, "--verbose")) {
1735                                 push_verbosely = 1;
1736                                 http_is_verbose = 1;
1737                                 continue;
1738                         }
1739                         if (!strcmp(arg, "-d")) {
1740                                 delete_branch = 1;
1741                                 continue;
1742                         }
1743                         if (!strcmp(arg, "-D")) {
1744                                 delete_branch = 1;
1745                                 force_delete = 1;
1746                                 continue;
1747                         }
1748                         if (!strcmp(arg, "-h"))
1749                                 usage(http_push_usage);
1750                 }
1751                 if (!repo->url) {
1752                         char *path = strstr(arg, "//");
1753                         str_end_url_with_slash(arg, &repo->url);
1754                         repo->path_len = strlen(repo->url);
1755                         if (path) {
1756                                 repo->path = strchr(path+2, '/');
1757                                 if (repo->path)
1758                                         repo->path_len = strlen(repo->path);
1759                         }
1760                         continue;
1761                 }
1762                 refspec_appendn(&rs, argv, argc - i);
1763                 break;
1764         }
1765
1766 #ifndef USE_CURL_MULTI
1767         die("git-push is not available for http/https repository when not compiled with USE_CURL_MULTI");
1768 #endif
1769
1770         if (!repo->url)
1771                 usage(http_push_usage);
1772
1773         if (delete_branch && rs.nr != 1)
1774                 die("You must specify only one branch name when deleting a remote branch");
1775
1776         setup_git_directory();
1777
1778         memset(remote_dir_exists, -1, 256);
1779
1780         http_init(NULL, repo->url, 1);
1781
1782 #ifdef USE_CURL_MULTI
1783         is_running_queue = 0;
1784 #endif
1785
1786         /* Verify DAV compliance/lock support */
1787         if (!locking_available()) {
1788                 rc = 1;
1789                 goto cleanup;
1790         }
1791
1792         sigchain_push_common(remove_locks_on_signal);
1793
1794         /* Check whether the remote has server info files */
1795         repo->can_update_info_refs = 0;
1796         repo->has_info_refs = remote_exists("info/refs");
1797         repo->has_info_packs = remote_exists("objects/info/packs");
1798         if (repo->has_info_refs) {
1799                 info_ref_lock = lock_remote("info/refs", LOCK_TIME);
1800                 if (info_ref_lock)
1801                         repo->can_update_info_refs = 1;
1802                 else {
1803                         error("cannot lock existing info/refs");
1804                         rc = 1;
1805                         goto cleanup;
1806                 }
1807         }
1808         if (repo->has_info_packs)
1809                 fetch_indices();
1810
1811         /* Get a list of all local and remote heads to validate refspecs */
1812         local_refs = get_local_heads();
1813         fprintf(stderr, "Fetching remote heads...\n");
1814         get_dav_remote_heads();
1815         run_request_queue();
1816
1817         /* Remove a remote branch if -d or -D was specified */
1818         if (delete_branch) {
1819                 const char *branch = rs.items[i].src;
1820                 if (delete_remote_branch(branch, force_delete) == -1) {
1821                         fprintf(stderr, "Unable to delete remote branch %s\n",
1822                                 branch);
1823                         if (helper_status)
1824                                 printf("error %s cannot remove\n", branch);
1825                 }
1826                 goto cleanup;
1827         }
1828
1829         /* match them up */
1830         if (match_push_refs(local_refs, &remote_refs, &rs, push_all)) {
1831                 rc = -1;
1832                 goto cleanup;
1833         }
1834         if (!remote_refs) {
1835                 fprintf(stderr, "No refs in common and none specified; doing nothing.\n");
1836                 if (helper_status)
1837                         printf("error null no match\n");
1838                 rc = 0;
1839                 goto cleanup;
1840         }
1841
1842         new_refs = 0;
1843         for (ref = remote_refs; ref; ref = ref->next) {
1844                 struct argv_array commit_argv = ARGV_ARRAY_INIT;
1845
1846                 if (!ref->peer_ref)
1847                         continue;
1848
1849                 if (is_null_oid(&ref->peer_ref->new_oid)) {
1850                         if (delete_remote_branch(ref->name, 1) == -1) {
1851                                 error("Could not remove %s", ref->name);
1852                                 if (helper_status)
1853                                         printf("error %s cannot remove\n", ref->name);
1854                                 rc = -4;
1855                         }
1856                         else if (helper_status)
1857                                 printf("ok %s\n", ref->name);
1858                         new_refs++;
1859                         continue;
1860                 }
1861
1862                 if (oideq(&ref->old_oid, &ref->peer_ref->new_oid)) {
1863                         if (push_verbosely)
1864                                 fprintf(stderr, "'%s': up-to-date\n", ref->name);
1865                         if (helper_status)
1866                                 printf("ok %s up to date\n", ref->name);
1867                         continue;
1868                 }
1869
1870                 if (!force_all &&
1871                     !is_null_oid(&ref->old_oid) &&
1872                     !ref->force) {
1873                         if (!has_object_file(&ref->old_oid) ||
1874                             !ref_newer(&ref->peer_ref->new_oid,
1875                                        &ref->old_oid)) {
1876                                 /*
1877                                  * We do not have the remote ref, or
1878                                  * we know that the remote ref is not
1879                                  * an ancestor of what we are trying to
1880                                  * push.  Either way this can be losing
1881                                  * commits at the remote end and likely
1882                                  * we were not up to date to begin with.
1883                                  */
1884                                 error("remote '%s' is not an ancestor of\n"
1885                                       "local '%s'.\n"
1886                                       "Maybe you are not up-to-date and "
1887                                       "need to pull first?",
1888                                       ref->name,
1889                                       ref->peer_ref->name);
1890                                 if (helper_status)
1891                                         printf("error %s non-fast forward\n", ref->name);
1892                                 rc = -2;
1893                                 continue;
1894                         }
1895                 }
1896                 oidcpy(&ref->new_oid, &ref->peer_ref->new_oid);
1897                 new_refs++;
1898
1899                 fprintf(stderr, "updating '%s'", ref->name);
1900                 if (strcmp(ref->name, ref->peer_ref->name))
1901                         fprintf(stderr, " using '%s'", ref->peer_ref->name);
1902                 fprintf(stderr, "\n  from %s\n  to   %s\n",
1903                         oid_to_hex(&ref->old_oid), oid_to_hex(&ref->new_oid));
1904                 if (dry_run) {
1905                         if (helper_status)
1906                                 printf("ok %s\n", ref->name);
1907                         continue;
1908                 }
1909
1910                 /* Lock remote branch ref */
1911                 ref_lock = lock_remote(ref->name, LOCK_TIME);
1912                 if (ref_lock == NULL) {
1913                         fprintf(stderr, "Unable to lock remote branch %s\n",
1914                                 ref->name);
1915                         if (helper_status)
1916                                 printf("error %s lock error\n", ref->name);
1917                         rc = 1;
1918                         continue;
1919                 }
1920
1921                 /* Set up revision info for this refspec */
1922                 argv_array_push(&commit_argv, ""); /* ignored */
1923                 argv_array_push(&commit_argv, "--objects");
1924                 argv_array_push(&commit_argv, oid_to_hex(&ref->new_oid));
1925                 if (!push_all && !is_null_oid(&ref->old_oid))
1926                         argv_array_pushf(&commit_argv, "^%s",
1927                                          oid_to_hex(&ref->old_oid));
1928                 repo_init_revisions(the_repository, &revs, setup_git_directory());
1929                 setup_revisions(commit_argv.argc, commit_argv.argv, &revs, NULL);
1930                 revs.edge_hint = 0; /* just in case */
1931
1932                 /* Generate a list of objects that need to be pushed */
1933                 pushing = 0;
1934                 if (prepare_revision_walk(&revs))
1935                         die("revision walk setup failed");
1936                 mark_edges_uninteresting(&revs, NULL);
1937                 objects_to_send = get_delta(&revs, ref_lock);
1938                 finish_all_active_slots();
1939
1940                 /* Push missing objects to remote, this would be a
1941                    convenient time to pack them first if appropriate. */
1942                 pushing = 1;
1943                 if (objects_to_send)
1944                         fprintf(stderr, "    sending %d objects\n",
1945                                 objects_to_send);
1946
1947                 run_request_queue();
1948
1949                 /* Update the remote branch if all went well */
1950                 if (aborted || !update_remote(ref->new_oid.hash, ref_lock))
1951                         rc = 1;
1952
1953                 if (!rc)
1954                         fprintf(stderr, "    done\n");
1955                 if (helper_status)
1956                         printf("%s %s\n", !rc ? "ok" : "error", ref->name);
1957                 unlock_remote(ref_lock);
1958                 check_locks();
1959                 argv_array_clear(&commit_argv);
1960         }
1961
1962         /* Update remote server info if appropriate */
1963         if (repo->has_info_refs && new_refs) {
1964                 if (info_ref_lock && repo->can_update_info_refs) {
1965                         fprintf(stderr, "Updating remote server info\n");
1966                         if (!dry_run)
1967                                 update_remote_info_refs(info_ref_lock);
1968                 } else {
1969                         fprintf(stderr, "Unable to update server info\n");
1970                 }
1971         }
1972
1973  cleanup:
1974         if (info_ref_lock)
1975                 unlock_remote(info_ref_lock);
1976         free(repo);
1977
1978         http_cleanup();
1979
1980         request = request_queue_head;
1981         while (request != NULL) {
1982                 next_request = request->next;
1983                 release_request(request);
1984                 request = next_request;
1985         }
1986
1987         return rc;
1988 }