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(request->url);
 295                 request->url = NULL;
 296         }
 297 }
 298 #endif
 299
 300 static void start_fetch_packed(struct transfer_request *request)
 301 {
 302         struct packed_git *target;
 303
 304         struct transfer_request *check_request = request_queue_head;
 305         struct http_pack_request *preq;
 306
 307         target = find_sha1_pack(request->obj->oid.hash, repo->packs);
 308         if (!target) {
 309                 fprintf(stderr, "Unable to fetch %s, will not be able to update server info refs\n", oid_to_hex(&request->obj->oid));
 310                 repo->can_update_info_refs = 0;
 311                 release_request(request);
 312                 return;
 313         }
 314
 315         fprintf(stderr, "Fetching pack %s\n", sha1_to_hex(target->sha1));
 316         fprintf(stderr, " which contains %s\n", oid_to_hex(&request->obj->oid));
 317
 318         preq = new_http_pack_request(target, repo->url);
 319         if (preq == NULL) {
 320                 repo->can_update_info_refs = 0;
 321                 return;
 322         }
 323         preq->lst = &repo->packs;
 324
 325         /* Make sure there isn't another open request for this pack */
 326         while (check_request) {
 327                 if (check_request->state == RUN_FETCH_PACKED &&
 328                     !strcmp(check_request->url, preq->url)) {
 329                         release_http_pack_request(preq);
 330                         release_request(request);
 331                         return;
 332                 }
 333                 check_request = check_request->next;
 334         }
 335
 336         preq->slot->callback_func = process_response;
 337         preq->slot->callback_data = request;
 338         request->slot = preq->slot;
 339         request->userData = preq;
 340
 341         /* Try to get the request started, abort the request on error */
 342         request->state = RUN_FETCH_PACKED;
 343         if (!start_active_slot(preq->slot)) {
 344                 fprintf(stderr, "Unable to start GET request\n");
 345                 release_http_pack_request(preq);
 346                 repo->can_update_info_refs = 0;
 347                 release_request(request);
 348         }
 349 }
 350
 351 static void start_put(struct transfer_request *request)
 352 {
 353         char *hex = oid_to_hex(&request->obj->oid);
 354         struct active_request_slot *slot;
 355         struct strbuf buf = STRBUF_INIT;
 356         enum object_type type;
 357         char hdr[50];
 358         void *unpacked;
 359         unsigned long len;
 360         int hdrlen;
 361         ssize_t size;
 362         git_zstream stream;
 363
 364         unpacked = read_sha1_file(request->obj->oid.hash, &type, &len);
 365         hdrlen = xsnprintf(hdr, sizeof(hdr), "%s %lu", typename(type), len) + 1;
 366
 367         /* Set it up */
 368         git_deflate_init(&stream, zlib_compression_level);
 369         size = git_deflate_bound(&stream, len + hdrlen);
 370         strbuf_init(&request->buffer.buf, size);
 371         request->buffer.posn = 0;
 372
 373         /* Compress it */
 374         stream.next_out = (unsigned char *)request->buffer.buf.buf;
 375         stream.avail_out = size;
 376
 377         /* First header.. */
 378         stream.next_in = (void *)hdr;
 379         stream.avail_in = hdrlen;
 380         while (git_deflate(&stream, 0) == Z_OK)
 381                 ; /* nothing */
 382
 383         /* Then the data itself.. */
 384         stream.next_in = unpacked;
 385         stream.avail_in = len;
 386         while (git_deflate(&stream, Z_FINISH) == Z_OK)
 387                 ; /* nothing */
 388         git_deflate_end(&stream);
 389         free(unpacked);
 390
 391         request->buffer.buf.len = stream.total_out;
 392
 393         strbuf_addstr(&buf, "Destination: ");
 394         append_remote_object_url(&buf, repo->url, hex, 0);
 395         request->dest = strbuf_detach(&buf, NULL);
 396
 397         append_remote_object_url(&buf, repo->url, hex, 0);
 398         strbuf_add(&buf, request->lock->tmpfile_suffix, 41);
 399         request->url = strbuf_detach(&buf, NULL);
 400
 401         slot = get_active_slot();
 402         slot->callback_func = process_response;
 403         slot->callback_data = request;
 404         curl_setup_http(slot->curl, request->url, DAV_PUT,
 405                         &request->buffer, fwrite_null);
 406
 407         if (start_active_slot(slot)) {
 408                 request->slot = slot;
 409                 request->state = RUN_PUT;
 410         } else {
 411                 request->state = ABORTED;
 412                 free(request->url);
 413                 request->url = NULL;
 414         }
 415 }
 416
 417 static void start_move(struct transfer_request *request)
 418 {
 419         struct active_request_slot *slot;
 420         struct curl_slist *dav_headers = http_copy_default_headers();
 421
 422         slot = get_active_slot();
 423         slot->callback_func = process_response;
 424         slot->callback_data = request;
 425         curl_setup_http_get(slot->curl, request->url, DAV_MOVE);
 426         dav_headers = curl_slist_append(dav_headers, request->dest);
 427         dav_headers = curl_slist_append(dav_headers, "Overwrite: T");
 428         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
 429
 430         if (start_active_slot(slot)) {
 431                 request->slot = slot;
 432                 request->state = RUN_MOVE;
 433         } else {
 434                 request->state = ABORTED;
 435                 free(request->url);
 436                 request->url = NULL;
 437         }
 438 }
 439
 440 static int refresh_lock(struct remote_lock *lock)
 441 {
 442         struct active_request_slot *slot;
 443         struct slot_results results;
 444         struct curl_slist *dav_headers;
 445         int rc = 0;
 446
 447         lock->refreshing = 1;
 448
 449         dav_headers = get_dav_token_headers(lock, DAV_HEADER_IF | DAV_HEADER_TIMEOUT);
 450
 451         slot = get_active_slot();
 452         slot->results = &results;
 453         curl_setup_http_get(slot->curl, lock->url, DAV_LOCK);
 454         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
 455
 456         if (start_active_slot(slot)) {
 457                 run_active_slot(slot);
 458                 if (results.curl_result != CURLE_OK) {
 459                         fprintf(stderr, "LOCK HTTP error %ld\n",
 460                                 results.http_code);
 461                 } else {
 462                         lock->start_time = time(NULL);
 463                         rc = 1;
 464                 }
 465         }
 466
 467         lock->refreshing = 0;
 468         curl_slist_free_all(dav_headers);
 469
 470         return rc;
 471 }
 472
 473 static void check_locks(void)
 474 {
 475         struct remote_lock *lock = repo->locks;
 476         time_t current_time = time(NULL);
 477         int time_remaining;
 478
 479         while (lock) {
 480                 time_remaining = lock->start_time + lock->timeout -
 481                         current_time;
 482                 if (!lock->refreshing && time_remaining < LOCK_REFRESH) {
 483                         if (!refresh_lock(lock)) {
 484                                 fprintf(stderr,
 485                                         "Unable to refresh lock for %s\n",
 486                                         lock->url);
 487                                 aborted = 1;
 488                                 return;
 489                         }
 490                 }
 491                 lock = lock->next;
 492         }
 493 }
 494
 495 static void release_request(struct transfer_request *request)
 496 {
 497         struct transfer_request *entry = request_queue_head;
 498
 499         if (request == request_queue_head) {
 500                 request_queue_head = request->next;
 501         } else {
 502                 while (entry->next != NULL && entry->next != request)
 503                         entry = entry->next;
 504                 if (entry->next == request)
 505                         entry->next = entry->next->next;
 506         }
 507
 508         free(request->url);
 509         free(request);
 510 }
 511
 512 static void finish_request(struct transfer_request *request)
 513 {
 514         struct http_pack_request *preq;
 515         struct http_object_request *obj_req;
 516
 517         request->curl_result = request->slot->curl_result;
 518         request->http_code = request->slot->http_code;
 519         request->slot = NULL;
 520
 521         /* Keep locks active */
 522         check_locks();
 523
 524         if (request->headers != NULL)
 525                 curl_slist_free_all(request->headers);
 526
 527         /* URL is reused for MOVE after PUT */
 528         if (request->state != RUN_PUT) {
 529                 free(request->url);
 530                 request->url = NULL;
 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 unsigned char *sha1)
 722 {
 723         struct object *obj;
 724
 725         obj = lookup_object(sha1);
 726         if (!obj)
 727                 obj = parse_object(sha1);
 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(ctx->cdata);
 807         ctx->cdata = NULL;
 808
 809         ctx->userFunc(ctx, 0);
 810 }
 811
 812 static void
 813 xml_end_tag(void *userData, const char *name)
 814 {
 815         struct xml_ctx *ctx = (struct xml_ctx *)userData;
 816         const char *c = strchr(name, ':');
 817         char *ep;
 818
 819         ctx->userFunc(ctx, 1);
 820
 821         if (c == NULL)
 822                 c = name;
 823         else
 824                 c++;
 825
 826         ep = ctx->name + strlen(ctx->name) - strlen(c) - 1;
 827         *ep = 0;
 828 }
 829
 830 static void
 831 xml_cdata(void *userData, const XML_Char *s, int len)
 832 {
 833         struct xml_ctx *ctx = (struct xml_ctx *)userData;
 834         free(ctx->cdata);
 835         ctx->cdata = xmemdupz(s, len);
 836 }
 837
 838 static struct remote_lock *lock_remote(const char *path, long timeout)
 839 {
 840         struct active_request_slot *slot;
 841         struct slot_results results;
 842         struct buffer out_buffer = { STRBUF_INIT, 0 };
 843         struct strbuf in_buffer = STRBUF_INIT;
 844         char *url;
 845         char *ep;
 846         char timeout_header[25];
 847         struct remote_lock *lock = NULL;
 848         struct curl_slist *dav_headers = http_copy_default_headers();
 849         struct xml_ctx ctx;
 850         char *escaped;
 851
 852         url = xstrfmt("%s%s", repo->url, path);
 853
 854         /* Make sure leading directories exist for the remote ref */
 855         ep = strchr(url + strlen(repo->url) + 1, '/');
 856         while (ep) {
 857                 char saved_character = ep[1];
 858                 ep[1] = '\0';
 859                 slot = get_active_slot();
 860                 slot->results = &results;
 861                 curl_setup_http_get(slot->curl, url, DAV_MKCOL);
 862                 if (start_active_slot(slot)) {
 863                         run_active_slot(slot);
 864                         if (results.curl_result != CURLE_OK &&
 865                             results.http_code != 405) {
 866                                 fprintf(stderr,
 867                                         "Unable to create branch path %s\n",
 868                                         url);
 869                                 free(url);
 870                                 return NULL;
 871                         }
 872                 } else {
 873                         fprintf(stderr, "Unable to start MKCOL request\n");
 874                         free(url);
 875                         return NULL;
 876                 }
 877                 ep[1] = saved_character;
 878                 ep = strchr(ep + 1, '/');
 879         }
 880
 881         escaped = xml_entities(ident_default_email());
 882         strbuf_addf(&out_buffer.buf, LOCK_REQUEST, escaped);
 883         free(escaped);
 884
 885         xsnprintf(timeout_header, sizeof(timeout_header), "Timeout: Second-%ld", timeout);
 886         dav_headers = curl_slist_append(dav_headers, timeout_header);
 887         dav_headers = curl_slist_append(dav_headers, "Content-Type: text/xml");
 888
 889         slot = get_active_slot();
 890         slot->results = &results;
 891         curl_setup_http(slot->curl, url, DAV_LOCK, &out_buffer, fwrite_buffer);
 892         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
 893         curl_easy_setopt(slot->curl, CURLOPT_FILE, &in_buffer);
 894
 895         lock = xcalloc(1, sizeof(*lock));
 896         lock->timeout = -1;
 897
 898         if (start_active_slot(slot)) {
 899                 run_active_slot(slot);
 900                 if (results.curl_result == CURLE_OK) {
 901                         XML_Parser parser = XML_ParserCreate(NULL);
 902                         enum XML_Status result;
 903                         ctx.name = xcalloc(10, 1);
 904                         ctx.len = 0;
 905                         ctx.cdata = NULL;
 906                         ctx.userFunc = handle_new_lock_ctx;
 907                         ctx.userData = lock;
 908                         XML_SetUserData(parser, &ctx);
 909                         XML_SetElementHandler(parser, xml_start_tag,
 910                                               xml_end_tag);
 911                         XML_SetCharacterDataHandler(parser, xml_cdata);
 912                         result = XML_Parse(parser, in_buffer.buf,
 913                                            in_buffer.len, 1);
 914                         free(ctx.name);
 915                         if (result != XML_STATUS_OK) {
 916                                 fprintf(stderr, "XML error: %s\n",
 917                                         XML_ErrorString(
 918                                                 XML_GetErrorCode(parser)));
 919                                 lock->timeout = -1;
 920                         }
 921                         XML_ParserFree(parser);
 922                 }
 923         } else {
 924                 fprintf(stderr, "Unable to start LOCK request\n");
 925         }
 926
 927         curl_slist_free_all(dav_headers);
 928         strbuf_release(&out_buffer.buf);
 929         strbuf_release(&in_buffer);
 930
 931         if (lock->token == NULL || lock->timeout <= 0) {
 932                 free(lock->token);
 933                 free(lock->owner);
 934                 free(url);
 935                 free(lock);
 936                 lock = NULL;
 937         } else {
 938                 lock->url = url;
 939                 lock->start_time = time(NULL);
 940                 lock->next = repo->locks;
 941                 repo->locks = lock;
 942         }
 943
 944         return lock;
 945 }
 946
 947 static int unlock_remote(struct remote_lock *lock)
 948 {
 949         struct active_request_slot *slot;
 950         struct slot_results results;
 951         struct remote_lock *prev = repo->locks;
 952         struct curl_slist *dav_headers;
 953         int rc = 0;
 954
 955         dav_headers = get_dav_token_headers(lock, DAV_HEADER_LOCK);
 956
 957         slot = get_active_slot();
 958         slot->results = &results;
 959         curl_setup_http_get(slot->curl, lock->url, DAV_UNLOCK);
 960         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
 961
 962         if (start_active_slot(slot)) {
 963                 run_active_slot(slot);
 964                 if (results.curl_result == CURLE_OK)
 965                         rc = 1;
 966                 else
 967                         fprintf(stderr, "UNLOCK HTTP error %ld\n",
 968                                 results.http_code);
 969         } else {
 970                 fprintf(stderr, "Unable to start UNLOCK request\n");
 971         }
 972
 973         curl_slist_free_all(dav_headers);
 974
 975         if (repo->locks == lock) {
 976                 repo->locks = lock->next;
 977         } else {
 978                 while (prev && prev->next != lock)
 979                         prev = prev->next;
 980                 if (prev)
 981                         prev->next = prev->next->next;
 982         }
 983
 984         free(lock->owner);
 985         free(lock->url);
 986         free(lock->token);
 987         free(lock);
 988
 989         return rc;
 990 }
 991
 992 static void remove_locks(void)
 993 {
 994         struct remote_lock *lock = repo->locks;
 995
 996         fprintf(stderr, "Removing remote locks...\n");
 997         while (lock) {
 998                 struct remote_lock *next = lock->next;
 999                 unlock_remote(lock);
1000                 lock = next;
1001         }
1002 }
1003
1004 static void remove_locks_on_signal(int signo)
1005 {
1006         remove_locks();
1007         sigchain_pop(signo);
1008         raise(signo);
1009 }
1010
1011 static void remote_ls(const char *path, int flags,
1012                       void (*userFunc)(struct remote_ls_ctx *ls),
1013                       void *userData);
1014
1015 /* extract hex from sharded "xx/x{40}" filename */
1016 static int get_sha1_hex_from_objpath(const char *path, unsigned char *sha1)
1017 {
1018         char hex[40];
1019
1020         if (strlen(path) != 41)
1021                 return -1;
1022
1023         memcpy(hex, path, 2);
1024         path += 2;
1025         path++; /* skip '/' */
1026         memcpy(hex, path, 38);
1027
1028         return get_sha1_hex(hex, sha1);
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         unsigned char sha1[20];
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_sha1_hex_from_objpath(path, sha1))
1044                 return;
1045
1046         one_remote_object(sha1);
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(ls->dentry_name);
1109                 ls->dentry_name = NULL;
1110                 ls->dentry_flags = 0;
1111         }
1112 }
1113
1114 /*
1115  * NEEDSWORK: remote_ls() ignores info/refs on the remote side.  But it
1116  * should _only_ heed the information from that file, instead of trying to
1117  * determine the refs from the remote file system (badly: it does not even
1118  * know about packed-refs).
1119  */
1120 static void remote_ls(const char *path, int flags,
1121                       void (*userFunc)(struct remote_ls_ctx *ls),
1122                       void *userData)
1123 {
1124         char *url = xstrfmt("%s%s", repo->url, path);
1125         struct active_request_slot *slot;
1126         struct slot_results results;
1127         struct strbuf in_buffer = STRBUF_INIT;
1128         struct buffer out_buffer = { STRBUF_INIT, 0 };
1129         struct curl_slist *dav_headers = http_copy_default_headers();
1130         struct xml_ctx ctx;
1131         struct remote_ls_ctx ls;
1132
1133         ls.flags = flags;
1134         ls.path = xstrdup(path);
1135         ls.dentry_name = NULL;
1136         ls.dentry_flags = 0;
1137         ls.userData = userData;
1138         ls.userFunc = userFunc;
1139
1140         strbuf_addf(&out_buffer.buf, PROPFIND_ALL_REQUEST);
1141
1142         dav_headers = curl_slist_append(dav_headers, "Depth: 1");
1143         dav_headers = curl_slist_append(dav_headers, "Content-Type: text/xml");
1144
1145         slot = get_active_slot();
1146         slot->results = &results;
1147         curl_setup_http(slot->curl, url, DAV_PROPFIND,
1148                         &out_buffer, fwrite_buffer);
1149         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
1150         curl_easy_setopt(slot->curl, CURLOPT_FILE, &in_buffer);
1151
1152         if (start_active_slot(slot)) {
1153                 run_active_slot(slot);
1154                 if (results.curl_result == CURLE_OK) {
1155                         XML_Parser parser = XML_ParserCreate(NULL);
1156                         enum XML_Status result;
1157                         ctx.name = xcalloc(10, 1);
1158                         ctx.len = 0;
1159                         ctx.cdata = NULL;
1160                         ctx.userFunc = handle_remote_ls_ctx;
1161                         ctx.userData = &ls;
1162                         XML_SetUserData(parser, &ctx);
1163                         XML_SetElementHandler(parser, xml_start_tag,
1164                                               xml_end_tag);
1165                         XML_SetCharacterDataHandler(parser, xml_cdata);
1166                         result = XML_Parse(parser, in_buffer.buf,
1167                                            in_buffer.len, 1);
1168                         free(ctx.name);
1169
1170                         if (result != XML_STATUS_OK) {
1171                                 fprintf(stderr, "XML error: %s\n",
1172                                         XML_ErrorString(
1173                                                 XML_GetErrorCode(parser)));
1174                         }
1175                         XML_ParserFree(parser);
1176                 }
1177         } else {
1178                 fprintf(stderr, "Unable to start PROPFIND request\n");
1179         }
1180
1181         free(ls.path);
1182         free(url);
1183         strbuf_release(&out_buffer.buf);
1184         strbuf_release(&in_buffer);
1185         curl_slist_free_all(dav_headers);
1186 }
1187
1188 static void get_remote_object_list(unsigned char parent)
1189 {
1190         char path[] = "objects/XX/";
1191         static const char hex[] = "0123456789abcdef";
1192         unsigned int val = parent;
1193
1194         path[8] = hex[val >> 4];
1195         path[9] = hex[val & 0xf];
1196         remote_dir_exists[val] = 0;
1197         remote_ls(path, (PROCESS_FILES | PROCESS_DIRS),
1198                   process_ls_object, &val);
1199 }
1200
1201 static int locking_available(void)
1202 {
1203         struct active_request_slot *slot;
1204         struct slot_results results;
1205         struct strbuf in_buffer = STRBUF_INIT;
1206         struct buffer out_buffer = { STRBUF_INIT, 0 };
1207         struct curl_slist *dav_headers = http_copy_default_headers();
1208         struct xml_ctx ctx;
1209         int lock_flags = 0;
1210         char *escaped;
1211
1212         escaped = xml_entities(repo->url);
1213         strbuf_addf(&out_buffer.buf, PROPFIND_SUPPORTEDLOCK_REQUEST, escaped);
1214         free(escaped);
1215
1216         dav_headers = curl_slist_append(dav_headers, "Depth: 0");
1217         dav_headers = curl_slist_append(dav_headers, "Content-Type: text/xml");
1218
1219         slot = get_active_slot();
1220         slot->results = &results;
1221         curl_setup_http(slot->curl, repo->url, DAV_PROPFIND,
1222                         &out_buffer, fwrite_buffer);
1223         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
1224         curl_easy_setopt(slot->curl, CURLOPT_FILE, &in_buffer);
1225
1226         if (start_active_slot(slot)) {
1227                 run_active_slot(slot);
1228                 if (results.curl_result == CURLE_OK) {
1229                         XML_Parser parser = XML_ParserCreate(NULL);
1230                         enum XML_Status result;
1231                         ctx.name = xcalloc(10, 1);
1232                         ctx.len = 0;
1233                         ctx.cdata = NULL;
1234                         ctx.userFunc = handle_lockprop_ctx;
1235                         ctx.userData = &lock_flags;
1236                         XML_SetUserData(parser, &ctx);
1237                         XML_SetElementHandler(parser, xml_start_tag,
1238                                               xml_end_tag);
1239                         result = XML_Parse(parser, in_buffer.buf,
1240                                            in_buffer.len, 1);
1241                         free(ctx.name);
1242
1243                         if (result != XML_STATUS_OK) {
1244                                 fprintf(stderr, "XML error: %s\n",
1245                                         XML_ErrorString(
1246                                                 XML_GetErrorCode(parser)));
1247                                 lock_flags = 0;
1248                         }
1249                         XML_ParserFree(parser);
1250                         if (!lock_flags)
1251                                 error("no DAV locking support on %s",
1252                                       repo->url);
1253
1254                 } else {
1255                         error("Cannot access URL %s, return code %d",
1256                               repo->url, results.curl_result);
1257                         lock_flags = 0;
1258                 }
1259         } else {
1260                 error("Unable to start PROPFIND request on %s", repo->url);
1261         }
1262
1263         strbuf_release(&out_buffer.buf);
1264         strbuf_release(&in_buffer);
1265         curl_slist_free_all(dav_headers);
1266
1267         return lock_flags;
1268 }
1269
1270 static struct object_list **add_one_object(struct object *obj, struct object_list **p)
1271 {
1272         struct object_list *entry = xmalloc(sizeof(struct object_list));
1273         entry->item = obj;
1274         entry->next = *p;
1275         *p = entry;
1276         return &entry->next;
1277 }
1278
1279 static struct object_list **process_blob(struct blob *blob,
1280                                          struct object_list **p)
1281 {
1282         struct object *obj = &blob->object;
1283
1284         obj->flags |= LOCAL;
1285
1286         if (obj->flags & (UNINTERESTING | SEEN))
1287                 return p;
1288
1289         obj->flags |= SEEN;
1290         return add_one_object(obj, p);
1291 }
1292
1293 static struct object_list **process_tree(struct tree *tree,
1294                                          struct object_list **p)
1295 {
1296         struct object *obj = &tree->object;
1297         struct tree_desc desc;
1298         struct name_entry entry;
1299
1300         obj->flags |= LOCAL;
1301
1302         if (obj->flags & (UNINTERESTING | SEEN))
1303                 return p;
1304         if (parse_tree(tree) < 0)
1305                 die("bad tree object %s", oid_to_hex(&obj->oid));
1306
1307         obj->flags |= SEEN;
1308         p = add_one_object(obj, p);
1309
1310         init_tree_desc(&desc, tree->buffer, tree->size);
1311
1312         while (tree_entry(&desc, &entry))
1313                 switch (object_type(entry.mode)) {
1314                 case OBJ_TREE:
1315                         p = process_tree(lookup_tree(entry.oid->hash), p);
1316                         break;
1317                 case OBJ_BLOB:
1318                         p = process_blob(lookup_blob(entry.oid->hash), p);
1319                         break;
1320                 default:
1321                         /* Subproject commit - not in this repository */
1322                         break;
1323                 }
1324
1325         free_tree_buffer(tree);
1326         return p;
1327 }
1328
1329 static int get_delta(struct rev_info *revs, struct remote_lock *lock)
1330 {
1331         int i;
1332         struct commit *commit;
1333         struct object_list **p = &objects;
1334         int count = 0;
1335
1336         while ((commit = get_revision(revs)) != NULL) {
1337                 p = process_tree(commit->tree, p);
1338                 commit->object.flags |= LOCAL;
1339                 if (!(commit->object.flags & UNINTERESTING))
1340                         count += add_send_request(&commit->object, lock);
1341         }
1342
1343         for (i = 0; i < revs->pending.nr; i++) {
1344                 struct object_array_entry *entry = revs->pending.objects + i;
1345                 struct object *obj = entry->item;
1346                 const char *name = entry->name;
1347
1348                 if (obj->flags & (UNINTERESTING | SEEN))
1349                         continue;
1350                 if (obj->type == OBJ_TAG) {
1351                         obj->flags |= SEEN;
1352                         p = add_one_object(obj, p);
1353                         continue;
1354                 }
1355                 if (obj->type == OBJ_TREE) {
1356                         p = process_tree((struct tree *)obj, p);
1357                         continue;
1358                 }
1359                 if (obj->type == OBJ_BLOB) {
1360                         p = process_blob((struct blob *)obj, p);
1361                         continue;
1362                 }
1363                 die("unknown pending object %s (%s)", oid_to_hex(&obj->oid), name);
1364         }
1365
1366         while (objects) {
1367                 if (!(objects->item->flags & UNINTERESTING))
1368                         count += add_send_request(objects->item, lock);
1369                 objects = objects->next;
1370         }
1371
1372         return count;
1373 }
1374
1375 static int update_remote(unsigned char *sha1, struct remote_lock *lock)
1376 {
1377         struct active_request_slot *slot;
1378         struct slot_results results;
1379         struct buffer out_buffer = { STRBUF_INIT, 0 };
1380         struct curl_slist *dav_headers;
1381
1382         dav_headers = get_dav_token_headers(lock, DAV_HEADER_IF);
1383
1384         strbuf_addf(&out_buffer.buf, "%s\n", sha1_to_hex(sha1));
1385
1386         slot = get_active_slot();
1387         slot->results = &results;
1388         curl_setup_http(slot->curl, lock->url, DAV_PUT,
1389                         &out_buffer, fwrite_null);
1390         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
1391
1392         if (start_active_slot(slot)) {
1393                 run_active_slot(slot);
1394                 strbuf_release(&out_buffer.buf);
1395                 if (results.curl_result != CURLE_OK) {
1396                         fprintf(stderr,
1397                                 "PUT error: curl result=%d, HTTP code=%ld\n",
1398                                 results.curl_result, results.http_code);
1399                         /* We should attempt recovery? */
1400                         return 0;
1401                 }
1402         } else {
1403                 strbuf_release(&out_buffer.buf);
1404                 fprintf(stderr, "Unable to start PUT request\n");
1405                 return 0;
1406         }
1407
1408         return 1;
1409 }
1410
1411 static struct ref *remote_refs;
1412
1413 static void one_remote_ref(const char *refname)
1414 {
1415         struct ref *ref;
1416         struct object *obj;
1417
1418         ref = alloc_ref(refname);
1419
1420         if (http_fetch_ref(repo->url, ref) != 0) {
1421                 fprintf(stderr,
1422                         "Unable to fetch ref %s from %s\n",
1423                         refname, repo->url);
1424                 free(ref);
1425                 return;
1426         }
1427
1428         /*
1429          * Fetch a copy of the object if it doesn't exist locally - it
1430          * may be required for updating server info later.
1431          */
1432         if (repo->can_update_info_refs && !has_object_file(&ref->old_oid)) {
1433                 obj = lookup_unknown_object(ref->old_oid.hash);
1434                 if (obj) {
1435                         fprintf(stderr, "  fetch %s for %s\n",
1436                                 oid_to_hex(&ref->old_oid), refname);
1437                         add_fetch_request(obj);
1438                 }
1439         }
1440
1441         ref->next = remote_refs;
1442         remote_refs = ref;
1443 }
1444
1445 static void get_dav_remote_heads(void)
1446 {
1447         remote_ls("refs/", (PROCESS_FILES | PROCESS_DIRS | RECURSIVE), process_ls_ref, NULL);
1448 }
1449
1450 static void add_remote_info_ref(struct remote_ls_ctx *ls)
1451 {
1452         struct strbuf *buf = (struct strbuf *)ls->userData;
1453         struct object *o;
1454         struct ref *ref;
1455
1456         ref = alloc_ref(ls->dentry_name);
1457
1458         if (http_fetch_ref(repo->url, ref) != 0) {
1459                 fprintf(stderr,
1460                         "Unable to fetch ref %s from %s\n",
1461                         ls->dentry_name, repo->url);
1462                 aborted = 1;
1463                 free(ref);
1464                 return;
1465         }
1466
1467         o = parse_object(ref->old_oid.hash);
1468         if (!o) {
1469                 fprintf(stderr,
1470                         "Unable to parse object %s for remote ref %s\n",
1471                         oid_to_hex(&ref->old_oid), ls->dentry_name);
1472                 aborted = 1;
1473                 free(ref);
1474                 return;
1475         }
1476
1477         strbuf_addf(buf, "%s\t%s\n",
1478                     oid_to_hex(&ref->old_oid), ls->dentry_name);
1479
1480         if (o->type == OBJ_TAG) {
1481                 o = deref_tag(o, ls->dentry_name, 0);
1482                 if (o)
1483                         strbuf_addf(buf, "%s\t%s^{}\n",
1484                                     oid_to_hex(&o->oid), ls->dentry_name);
1485         }
1486         free(ref);
1487 }
1488
1489 static void update_remote_info_refs(struct remote_lock *lock)
1490 {
1491         struct buffer buffer = { STRBUF_INIT, 0 };
1492         struct active_request_slot *slot;
1493         struct slot_results results;
1494         struct curl_slist *dav_headers;
1495
1496         remote_ls("refs/", (PROCESS_FILES | RECURSIVE),
1497                   add_remote_info_ref, &buffer.buf);
1498         if (!aborted) {
1499                 dav_headers = get_dav_token_headers(lock, DAV_HEADER_IF);
1500
1501                 slot = get_active_slot();
1502                 slot->results = &results;
1503                 curl_setup_http(slot->curl, lock->url, DAV_PUT,
1504                                 &buffer, fwrite_null);
1505                 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
1506
1507                 if (start_active_slot(slot)) {
1508                         run_active_slot(slot);
1509                         if (results.curl_result != CURLE_OK) {
1510                                 fprintf(stderr,
1511                                         "PUT error: curl result=%d, HTTP code=%ld\n",
1512                                         results.curl_result, results.http_code);
1513                         }
1514                 }
1515         }
1516         strbuf_release(&buffer.buf);
1517 }
1518
1519 static int remote_exists(const char *path)
1520 {
1521         char *url = xstrfmt("%s%s", repo->url, path);
1522         int ret;
1523
1524
1525         switch (http_get_strbuf(url, NULL, NULL)) {
1526         case HTTP_OK:
1527                 ret = 1;
1528                 break;
1529         case HTTP_MISSING_TARGET:
1530                 ret = 0;
1531                 break;
1532         case HTTP_ERROR:
1533                 error("unable to access '%s': %s", url, curl_errorstr);
1534         default:
1535                 ret = -1;
1536         }
1537         free(url);
1538         return ret;
1539 }
1540
1541 static void fetch_symref(const char *path, char **symref, unsigned char *sha1)
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(*symref);
1553         *symref = NULL;
1554         hashclr(sha1);
1555
1556         if (buffer.len == 0)
1557                 return;
1558
1559         /* Cut off trailing newline. */
1560         strbuf_rtrim(&buffer);
1561
1562         /* If it's a symref, set the refname; otherwise try for a sha1 */
1563         if (skip_prefix(buffer.buf, "ref: ", &name)) {
1564                 *symref = xmemdupz(name, buffer.len - (name - buffer.buf));
1565         } else {
1566                 get_sha1_hex(buffer.buf, sha1);
1567         }
1568
1569         strbuf_release(&buffer);
1570 }
1571
1572 static int verify_merge_base(unsigned char *head_sha1, struct ref *remote)
1573 {
1574         struct commit *head = lookup_commit_or_die(head_sha1, "HEAD");
1575         struct commit *branch = lookup_commit_or_die(remote->old_oid.hash, 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         unsigned char head_sha1[20];
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_sha1);
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_sha1);
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_sha1(head_sha1))
1633                         return error("Unable to resolve remote HEAD");
1634                 if (!has_sha1_file(head_sha1))
1635                         return error("Remote HEAD resolves to object %s\nwhich does not exist locally, perhaps you need to fetch?", sha1_to_hex(head_sha1));
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_sha1, 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 main(int argc, char **argv)
1696 {
1697         struct transfer_request *request;
1698         struct transfer_request *next_request;
1699         int nr_refspec = 0;
1700         char **refspec = NULL;
1701         struct remote_lock *ref_lock = NULL;
1702         struct remote_lock *info_ref_lock = NULL;
1703         struct rev_info revs;
1704         int delete_branch = 0;
1705         int force_delete = 0;
1706         int objects_to_send;
1707         int rc = 0;
1708         int i;
1709         int new_refs;
1710         struct ref *ref, *local_refs;
1711
1712         git_setup_gettext();
1713
1714         git_extract_argv0_path(argv[0]);
1715
1716         repo = xcalloc(1, sizeof(*repo));
1717
1718         argv++;
1719         for (i = 1; i < argc; i++, argv++) {
1720                 char *arg = *argv;
1721
1722                 if (*arg == '-') {
1723                         if (!strcmp(arg, "--all")) {
1724                                 push_all = MATCH_REFS_ALL;
1725                                 continue;
1726                         }
1727                         if (!strcmp(arg, "--force")) {
1728                                 force_all = 1;
1729                                 continue;
1730                         }
1731                         if (!strcmp(arg, "--dry-run")) {
1732                                 dry_run = 1;
1733                                 continue;
1734                         }
1735                         if (!strcmp(arg, "--helper-status")) {
1736                                 helper_status = 1;
1737                                 continue;
1738                         }
1739                         if (!strcmp(arg, "--verbose")) {
1740                                 push_verbosely = 1;
1741                                 http_is_verbose = 1;
1742                                 continue;
1743                         }
1744                         if (!strcmp(arg, "-d")) {
1745                                 delete_branch = 1;
1746                                 continue;
1747                         }
1748                         if (!strcmp(arg, "-D")) {
1749                                 delete_branch = 1;
1750                                 force_delete = 1;
1751                                 continue;
1752                         }
1753                         if (!strcmp(arg, "-h"))
1754                                 usage(http_push_usage);
1755                 }
1756                 if (!repo->url) {
1757                         char *path = strstr(arg, "//");
1758                         str_end_url_with_slash(arg, &repo->url);
1759                         repo->path_len = strlen(repo->url);
1760                         if (path) {
1761                                 repo->path = strchr(path+2, '/');
1762                                 if (repo->path)
1763                                         repo->path_len = strlen(repo->path);
1764                         }
1765                         continue;
1766                 }
1767                 refspec = argv;
1768                 nr_refspec = argc - i;
1769                 break;
1770         }
1771
1772 #ifndef USE_CURL_MULTI
1773         die("git-push is not available for http/https repository when not compiled with USE_CURL_MULTI");
1774 #endif
1775
1776         if (!repo->url)
1777                 usage(http_push_usage);
1778
1779         if (delete_branch && nr_refspec != 1)
1780                 die("You must specify only one branch name when deleting a remote branch");
1781
1782         setup_git_directory();
1783
1784         memset(remote_dir_exists, -1, 256);
1785
1786         http_init(NULL, repo->url, 1);
1787
1788 #ifdef USE_CURL_MULTI
1789         is_running_queue = 0;
1790 #endif
1791
1792         /* Verify DAV compliance/lock support */
1793         if (!locking_available()) {
1794                 rc = 1;
1795                 goto cleanup;
1796         }
1797
1798         sigchain_push_common(remove_locks_on_signal);
1799
1800         /* Check whether the remote has server info files */
1801         repo->can_update_info_refs = 0;
1802         repo->has_info_refs = remote_exists("info/refs");
1803         repo->has_info_packs = remote_exists("objects/info/packs");
1804         if (repo->has_info_refs) {
1805                 info_ref_lock = lock_remote("info/refs", LOCK_TIME);
1806                 if (info_ref_lock)
1807                         repo->can_update_info_refs = 1;
1808                 else {
1809                         error("cannot lock existing info/refs");
1810                         rc = 1;
1811                         goto cleanup;
1812                 }
1813         }
1814         if (repo->has_info_packs)
1815                 fetch_indices();
1816
1817         /* Get a list of all local and remote heads to validate refspecs */
1818         local_refs = get_local_heads();
1819         fprintf(stderr, "Fetching remote heads...\n");
1820         get_dav_remote_heads();
1821         run_request_queue();
1822
1823         /* Remove a remote branch if -d or -D was specified */
1824         if (delete_branch) {
1825                 if (delete_remote_branch(refspec[0], force_delete) == -1) {
1826                         fprintf(stderr, "Unable to delete remote branch %s\n",
1827                                 refspec[0]);
1828                         if (helper_status)
1829                                 printf("error %s cannot remove\n", refspec[0]);
1830                 }
1831                 goto cleanup;
1832         }
1833
1834         /* match them up */
1835         if (match_push_refs(local_refs, &remote_refs,
1836                             nr_refspec, (const char **) refspec, push_all)) {
1837                 rc = -1;
1838                 goto cleanup;
1839         }
1840         if (!remote_refs) {
1841                 fprintf(stderr, "No refs in common and none specified; doing nothing.\n");
1842                 if (helper_status)
1843                         printf("error null no match\n");
1844                 rc = 0;
1845                 goto cleanup;
1846         }
1847
1848         new_refs = 0;
1849         for (ref = remote_refs; ref; ref = ref->next) {
1850                 struct argv_array commit_argv = ARGV_ARRAY_INIT;
1851
1852                 if (!ref->peer_ref)
1853                         continue;
1854
1855                 if (is_null_oid(&ref->peer_ref->new_oid)) {
1856                         if (delete_remote_branch(ref->name, 1) == -1) {
1857                                 error("Could not remove %s", ref->name);
1858                                 if (helper_status)
1859                                         printf("error %s cannot remove\n", ref->name);
1860                                 rc = -4;
1861                         }
1862                         else if (helper_status)
1863                                 printf("ok %s\n", ref->name);
1864                         new_refs++;
1865                         continue;
1866                 }
1867
1868                 if (!oidcmp(&ref->old_oid, &ref->peer_ref->new_oid)) {
1869                         if (push_verbosely)
1870                                 fprintf(stderr, "'%s': up-to-date\n", ref->name);
1871                         if (helper_status)
1872                                 printf("ok %s up to date\n", ref->name);
1873                         continue;
1874                 }
1875
1876                 if (!force_all &&
1877                     !is_null_oid(&ref->old_oid) &&
1878                     !ref->force) {
1879                         if (!has_object_file(&ref->old_oid) ||
1880                             !ref_newer(&ref->peer_ref->new_oid,
1881                                        &ref->old_oid)) {
1882                                 /*
1883                                  * We do not have the remote ref, or
1884                                  * we know that the remote ref is not
1885                                  * an ancestor of what we are trying to
1886                                  * push.  Either way this can be losing
1887                                  * commits at the remote end and likely
1888                                  * we were not up to date to begin with.
1889                                  */
1890                                 error("remote '%s' is not an ancestor of\n"
1891                                       "local '%s'.\n"
1892                                       "Maybe you are not up-to-date and "
1893                                       "need to pull first?",
1894                                       ref->name,
1895                                       ref->peer_ref->name);
1896                                 if (helper_status)
1897                                         printf("error %s non-fast forward\n", ref->name);
1898                                 rc = -2;
1899                                 continue;
1900                         }
1901                 }
1902                 oidcpy(&ref->new_oid, &ref->peer_ref->new_oid);
1903                 new_refs++;
1904
1905                 fprintf(stderr, "updating '%s'", ref->name);
1906                 if (strcmp(ref->name, ref->peer_ref->name))
1907                         fprintf(stderr, " using '%s'", ref->peer_ref->name);
1908                 fprintf(stderr, "\n  from %s\n  to   %s\n",
1909                         oid_to_hex(&ref->old_oid), oid_to_hex(&ref->new_oid));
1910                 if (dry_run) {
1911                         if (helper_status)
1912                                 printf("ok %s\n", ref->name);
1913                         continue;
1914                 }
1915
1916                 /* Lock remote branch ref */
1917                 ref_lock = lock_remote(ref->name, LOCK_TIME);
1918                 if (ref_lock == NULL) {
1919                         fprintf(stderr, "Unable to lock remote branch %s\n",
1920                                 ref->name);
1921                         if (helper_status)
1922                                 printf("error %s lock error\n", ref->name);
1923                         rc = 1;
1924                         continue;
1925                 }
1926
1927                 /* Set up revision info for this refspec */
1928                 argv_array_push(&commit_argv, ""); /* ignored */
1929                 argv_array_push(&commit_argv, "--objects");
1930                 argv_array_push(&commit_argv, oid_to_hex(&ref->new_oid));
1931                 if (!push_all && !is_null_oid(&ref->old_oid))
1932                         argv_array_pushf(&commit_argv, "^%s",
1933                                          oid_to_hex(&ref->old_oid));
1934                 init_revisions(&revs, setup_git_directory());
1935                 setup_revisions(commit_argv.argc, commit_argv.argv, &revs, NULL);
1936                 revs.edge_hint = 0; /* just in case */
1937
1938                 /* Generate a list of objects that need to be pushed */
1939                 pushing = 0;
1940                 if (prepare_revision_walk(&revs))
1941                         die("revision walk setup failed");
1942                 mark_edges_uninteresting(&revs, NULL);
1943                 objects_to_send = get_delta(&revs, ref_lock);
1944                 finish_all_active_slots();
1945
1946                 /* Push missing objects to remote, this would be a
1947                    convenient time to pack them first if appropriate. */
1948                 pushing = 1;
1949                 if (objects_to_send)
1950                         fprintf(stderr, "    sending %d objects\n",
1951                                 objects_to_send);
1952
1953                 run_request_queue();
1954
1955                 /* Update the remote branch if all went well */
1956                 if (aborted || !update_remote(ref->new_oid.hash, ref_lock))
1957                         rc = 1;
1958
1959                 if (!rc)
1960                         fprintf(stderr, "    done\n");
1961                 if (helper_status)
1962                         printf("%s %s\n", !rc ? "ok" : "error", ref->name);
1963                 unlock_remote(ref_lock);
1964                 check_locks();
1965                 argv_array_clear(&commit_argv);
1966         }
1967
1968         /* Update remote server info if appropriate */
1969         if (repo->has_info_refs && new_refs) {
1970                 if (info_ref_lock && repo->can_update_info_refs) {
1971                         fprintf(stderr, "Updating remote server info\n");
1972                         if (!dry_run)
1973                                 update_remote_info_refs(info_ref_lock);
1974                 } else {
1975                         fprintf(stderr, "Unable to update server info\n");
1976                 }
1977         }
1978
1979  cleanup:
1980         if (info_ref_lock)
1981                 unlock_remote(info_ref_lock);
1982         free(repo);
1983
1984         http_cleanup();
1985
1986         request = request_queue_head;
1987         while (request != NULL) {
1988                 next_request = request->next;
1989                 release_request(request);
1990                 request = next_request;
1991         }
1992
1993         return rc;
1994 }