Andrew's git / gitweb.git / http-push.c
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http-push.con commit CodingGuidelines: add Python coding guidelines (9ef43dd)
   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
  14#include <expat.h>
  15
  16static const char http_push_usage[] =
  17"git http-push [--all] [--dry-run] [--force] [--verbose] <remote> [<head>...]\n";
  18
  19#ifndef XML_STATUS_OK
  20enum XML_Status {
  21  XML_STATUS_OK = 1,
  22  XML_STATUS_ERROR = 0
  23};
  24#define XML_STATUS_OK    1
  25#define XML_STATUS_ERROR 0
  26#endif
  27
  28#define PREV_BUF_SIZE 4096
  29
  30/* DAV methods */
  31#define DAV_LOCK "LOCK"
  32#define DAV_MKCOL "MKCOL"
  33#define DAV_MOVE "MOVE"
  34#define DAV_PROPFIND "PROPFIND"
  35#define DAV_PUT "PUT"
  36#define DAV_UNLOCK "UNLOCK"
  37#define DAV_DELETE "DELETE"
  38
  39/* DAV lock flags */
  40#define DAV_PROP_LOCKWR (1u << 0)
  41#define DAV_PROP_LOCKEX (1u << 1)
  42#define DAV_LOCK_OK (1u << 2)
  43
  44/* DAV XML properties */
  45#define DAV_CTX_LOCKENTRY ".multistatus.response.propstat.prop.supportedlock.lockentry"
  46#define DAV_CTX_LOCKTYPE_WRITE ".multistatus.response.propstat.prop.supportedlock.lockentry.locktype.write"
  47#define DAV_CTX_LOCKTYPE_EXCLUSIVE ".multistatus.response.propstat.prop.supportedlock.lockentry.lockscope.exclusive"
  48#define DAV_ACTIVELOCK_OWNER ".prop.lockdiscovery.activelock.owner.href"
  49#define DAV_ACTIVELOCK_TIMEOUT ".prop.lockdiscovery.activelock.timeout"
  50#define DAV_ACTIVELOCK_TOKEN ".prop.lockdiscovery.activelock.locktoken.href"
  51#define DAV_PROPFIND_RESP ".multistatus.response"
  52#define DAV_PROPFIND_NAME ".multistatus.response.href"
  53#define DAV_PROPFIND_COLLECTION ".multistatus.response.propstat.prop.resourcetype.collection"
  54
  55/* DAV request body templates */
  56#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>"
  57#define PROPFIND_ALL_REQUEST "<?xml version=\"1.0\" encoding=\"utf-8\" ?>\n<D:propfind xmlns:D=\"DAV:\">\n<D:allprop/>\n</D:propfind>"
  58#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>"
  59
  60#define LOCK_TIME 600
  61#define LOCK_REFRESH 30
  62
  63/* bits #0-15 in revision.h */
  64
  65#define LOCAL    (1u<<16)
  66#define REMOTE   (1u<<17)
  67#define FETCHING (1u<<18)
  68#define PUSHING  (1u<<19)
  69
  70/* We allow "recursive" symbolic refs. Only within reason, though */
  71#define MAXDEPTH 5
  72
  73static int pushing;
  74static int aborted;
  75static signed char remote_dir_exists[256];
  76
  77static int push_verbosely;
  78static int push_all = MATCH_REFS_NONE;
  79static int force_all;
  80static int dry_run;
  81static int helper_status;
  82
  83static struct object_list *objects;
  84
  85struct repo {
  86        char *url;
  87        char *path;
  88        int path_len;
  89        int has_info_refs;
  90        int can_update_info_refs;
  91        int has_info_packs;
  92        struct packed_git *packs;
  93        struct remote_lock *locks;
  94};
  95
  96static struct repo *repo;
  97
  98enum transfer_state {
  99        NEED_FETCH,
 100        RUN_FETCH_LOOSE,
 101        RUN_FETCH_PACKED,
 102        NEED_PUSH,
 103        RUN_MKCOL,
 104        RUN_PUT,
 105        RUN_MOVE,
 106        ABORTED,
 107        COMPLETE
 108};
 109
 110struct transfer_request {
 111        struct object *obj;
 112        char *url;
 113        char *dest;
 114        struct remote_lock *lock;
 115        struct curl_slist *headers;
 116        struct buffer buffer;
 117        enum transfer_state state;
 118        CURLcode curl_result;
 119        char errorstr[CURL_ERROR_SIZE];
 120        long http_code;
 121        void *userData;
 122        struct active_request_slot *slot;
 123        struct transfer_request *next;
 124};
 125
 126static struct transfer_request *request_queue_head;
 127
 128struct xml_ctx {
 129        char *name;
 130        int len;
 131        char *cdata;
 132        void (*userFunc)(struct xml_ctx *ctx, int tag_closed);
 133        void *userData;
 134};
 135
 136struct remote_lock {
 137        char *url;
 138        char *owner;
 139        char *token;
 140        char tmpfile_suffix[41];
 141        time_t start_time;
 142        long timeout;
 143        int refreshing;
 144        struct remote_lock *next;
 145};
 146
 147/* Flags that control remote_ls processing */
 148#define PROCESS_FILES (1u << 0)
 149#define PROCESS_DIRS  (1u << 1)
 150#define RECURSIVE     (1u << 2)
 151
 152/* Flags that remote_ls passes to callback functions */
 153#define IS_DIR (1u << 0)
 154
 155struct remote_ls_ctx {
 156        char *path;
 157        void (*userFunc)(struct remote_ls_ctx *ls);
 158        void *userData;
 159        int flags;
 160        char *dentry_name;
 161        int dentry_flags;
 162        struct remote_ls_ctx *parent;
 163};
 164
 165/* get_dav_token_headers options */
 166enum dav_header_flag {
 167        DAV_HEADER_IF = (1u << 0),
 168        DAV_HEADER_LOCK = (1u << 1),
 169        DAV_HEADER_TIMEOUT = (1u << 2)
 170};
 171
 172static char *xml_entities(const char *s)
 173{
 174        struct strbuf buf = STRBUF_INIT;
 175        strbuf_addstr_xml_quoted(&buf, s);
 176        return strbuf_detach(&buf, NULL);
 177}
 178
 179static void curl_setup_http_get(CURL *curl, const char *url,
 180                const char *custom_req)
 181{
 182        curl_easy_setopt(curl, CURLOPT_HTTPGET, 1);
 183        curl_easy_setopt(curl, CURLOPT_URL, url);
 184        curl_easy_setopt(curl, CURLOPT_CUSTOMREQUEST, custom_req);
 185        curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, fwrite_null);
 186}
 187
 188static void curl_setup_http(CURL *curl, const char *url,
 189                const char *custom_req, struct buffer *buffer,
 190                curl_write_callback write_fn)
 191{
 192        curl_easy_setopt(curl, CURLOPT_PUT, 1);
 193        curl_easy_setopt(curl, CURLOPT_URL, url);
 194        curl_easy_setopt(curl, CURLOPT_INFILE, buffer);
 195        curl_easy_setopt(curl, CURLOPT_INFILESIZE, buffer->buf.len);
 196        curl_easy_setopt(curl, CURLOPT_READFUNCTION, fread_buffer);
 197#ifndef NO_CURL_IOCTL
 198        curl_easy_setopt(curl, CURLOPT_IOCTLFUNCTION, ioctl_buffer);
 199        curl_easy_setopt(curl, CURLOPT_IOCTLDATA, &buffer);
 200#endif
 201        curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, write_fn);
 202        curl_easy_setopt(curl, CURLOPT_NOBODY, 0);
 203        curl_easy_setopt(curl, CURLOPT_CUSTOMREQUEST, custom_req);
 204        curl_easy_setopt(curl, CURLOPT_UPLOAD, 1);
 205}
 206
 207static struct curl_slist *get_dav_token_headers(struct remote_lock *lock, enum dav_header_flag options)
 208{
 209        struct strbuf buf = STRBUF_INIT;
 210        struct curl_slist *dav_headers = NULL;
 211
 212        if (options & DAV_HEADER_IF) {
 213                strbuf_addf(&buf, "If: (<%s>)", lock->token);
 214                dav_headers = curl_slist_append(dav_headers, buf.buf);
 215                strbuf_reset(&buf);
 216        }
 217        if (options & DAV_HEADER_LOCK) {
 218                strbuf_addf(&buf, "Lock-Token: <%s>", lock->token);
 219                dav_headers = curl_slist_append(dav_headers, buf.buf);
 220                strbuf_reset(&buf);
 221        }
 222        if (options & DAV_HEADER_TIMEOUT) {
 223                strbuf_addf(&buf, "Timeout: Second-%ld", lock->timeout);
 224                dav_headers = curl_slist_append(dav_headers, buf.buf);
 225                strbuf_reset(&buf);
 226        }
 227        strbuf_release(&buf);
 228
 229        return dav_headers;
 230}
 231
 232static void finish_request(struct transfer_request *request);
 233static void release_request(struct transfer_request *request);
 234
 235static void process_response(void *callback_data)
 236{
 237        struct transfer_request *request =
 238                (struct transfer_request *)callback_data;
 239
 240        finish_request(request);
 241}
 242
 243#ifdef USE_CURL_MULTI
 244
 245static void start_fetch_loose(struct transfer_request *request)
 246{
 247        struct active_request_slot *slot;
 248        struct http_object_request *obj_req;
 249
 250        obj_req = new_http_object_request(repo->url, request->obj->sha1);
 251        if (obj_req == NULL) {
 252                request->state = ABORTED;
 253                return;
 254        }
 255
 256        slot = obj_req->slot;
 257        slot->callback_func = process_response;
 258        slot->callback_data = request;
 259        request->slot = slot;
 260        request->userData = obj_req;
 261
 262        /* Try to get the request started, abort the request on error */
 263        request->state = RUN_FETCH_LOOSE;
 264        if (!start_active_slot(slot)) {
 265                fprintf(stderr, "Unable to start GET request\n");
 266                repo->can_update_info_refs = 0;
 267                release_http_object_request(obj_req);
 268                release_request(request);
 269        }
 270}
 271
 272static void start_mkcol(struct transfer_request *request)
 273{
 274        char *hex = sha1_to_hex(request->obj->sha1);
 275        struct active_request_slot *slot;
 276
 277        request->url = get_remote_object_url(repo->url, hex, 1);
 278
 279        slot = get_active_slot();
 280        slot->callback_func = process_response;
 281        slot->callback_data = request;
 282        curl_setup_http_get(slot->curl, request->url, DAV_MKCOL);
 283        curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, request->errorstr);
 284
 285        if (start_active_slot(slot)) {
 286                request->slot = slot;
 287                request->state = RUN_MKCOL;
 288        } else {
 289                request->state = ABORTED;
 290                free(request->url);
 291                request->url = NULL;
 292        }
 293}
 294#endif
 295
 296static void start_fetch_packed(struct transfer_request *request)
 297{
 298        struct packed_git *target;
 299
 300        struct transfer_request *check_request = request_queue_head;
 301        struct http_pack_request *preq;
 302
 303        target = find_sha1_pack(request->obj->sha1, repo->packs);
 304        if (!target) {
 305                fprintf(stderr, "Unable to fetch %s, will not be able to update server info refs\n", sha1_to_hex(request->obj->sha1));
 306                repo->can_update_info_refs = 0;
 307                release_request(request);
 308                return;
 309        }
 310
 311        fprintf(stderr, "Fetching pack %s\n", sha1_to_hex(target->sha1));
 312        fprintf(stderr, " which contains %s\n", sha1_to_hex(request->obj->sha1));
 313
 314        preq = new_http_pack_request(target, repo->url);
 315        if (preq == NULL) {
 316                release_http_pack_request(preq);
 317                repo->can_update_info_refs = 0;
 318                return;
 319        }
 320        preq->lst = &repo->packs;
 321
 322        /* Make sure there isn't another open request for this pack */
 323        while (check_request) {
 324                if (check_request->state == RUN_FETCH_PACKED &&
 325                    !strcmp(check_request->url, preq->url)) {
 326                        release_http_pack_request(preq);
 327                        release_request(request);
 328                        return;
 329                }
 330                check_request = check_request->next;
 331        }
 332
 333        preq->slot->callback_func = process_response;
 334        preq->slot->callback_data = request;
 335        request->slot = preq->slot;
 336        request->userData = preq;
 337
 338        /* Try to get the request started, abort the request on error */
 339        request->state = RUN_FETCH_PACKED;
 340        if (!start_active_slot(preq->slot)) {
 341                fprintf(stderr, "Unable to start GET request\n");
 342                release_http_pack_request(preq);
 343                repo->can_update_info_refs = 0;
 344                release_request(request);
 345        }
 346}
 347
 348static void start_put(struct transfer_request *request)
 349{
 350        char *hex = sha1_to_hex(request->obj->sha1);
 351        struct active_request_slot *slot;
 352        struct strbuf buf = STRBUF_INIT;
 353        enum object_type type;
 354        char hdr[50];
 355        void *unpacked;
 356        unsigned long len;
 357        int hdrlen;
 358        ssize_t size;
 359        git_zstream stream;
 360
 361        unpacked = read_sha1_file(request->obj->sha1, &type, &len);
 362        hdrlen = sprintf(hdr, "%s %lu", typename(type), len) + 1;
 363
 364        /* Set it up */
 365        memset(&stream, 0, sizeof(stream));
 366        git_deflate_init(&stream, zlib_compression_level);
 367        size = git_deflate_bound(&stream, len + hdrlen);
 368        strbuf_init(&request->buffer.buf, size);
 369        request->buffer.posn = 0;
 370
 371        /* Compress it */
 372        stream.next_out = (unsigned char *)request->buffer.buf.buf;
 373        stream.avail_out = size;
 374
 375        /* First header.. */
 376        stream.next_in = (void *)hdr;
 377        stream.avail_in = hdrlen;
 378        while (git_deflate(&stream, 0) == Z_OK)
 379                ; /* nothing */
 380
 381        /* Then the data itself.. */
 382        stream.next_in = unpacked;
 383        stream.avail_in = len;
 384        while (git_deflate(&stream, Z_FINISH) == Z_OK)
 385                ; /* nothing */
 386        git_deflate_end(&stream);
 387        free(unpacked);
 388
 389        request->buffer.buf.len = stream.total_out;
 390
 391        strbuf_addstr(&buf, "Destination: ");
 392        append_remote_object_url(&buf, repo->url, hex, 0);
 393        request->dest = strbuf_detach(&buf, NULL);
 394
 395        append_remote_object_url(&buf, repo->url, hex, 0);
 396        strbuf_add(&buf, request->lock->tmpfile_suffix, 41);
 397        request->url = strbuf_detach(&buf, NULL);
 398
 399        slot = get_active_slot();
 400        slot->callback_func = process_response;
 401        slot->callback_data = request;
 402        curl_setup_http(slot->curl, request->url, DAV_PUT,
 403                        &request->buffer, fwrite_null);
 404
 405        if (start_active_slot(slot)) {
 406                request->slot = slot;
 407                request->state = RUN_PUT;
 408        } else {
 409                request->state = ABORTED;
 410                free(request->url);
 411                request->url = NULL;
 412        }
 413}
 414
 415static void start_move(struct transfer_request *request)
 416{
 417        struct active_request_slot *slot;
 418        struct curl_slist *dav_headers = NULL;
 419
 420        slot = get_active_slot();
 421        slot->callback_func = process_response;
 422        slot->callback_data = request;
 423        curl_setup_http_get(slot->curl, request->url, DAV_MOVE);
 424        dav_headers = curl_slist_append(dav_headers, request->dest);
 425        dav_headers = curl_slist_append(dav_headers, "Overwrite: T");
 426        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
 427
 428        if (start_active_slot(slot)) {
 429                request->slot = slot;
 430                request->state = RUN_MOVE;
 431        } else {
 432                request->state = ABORTED;
 433                free(request->url);
 434                request->url = NULL;
 435        }
 436}
 437
 438static int refresh_lock(struct remote_lock *lock)
 439{
 440        struct active_request_slot *slot;
 441        struct slot_results results;
 442        struct curl_slist *dav_headers;
 443        int rc = 0;
 444
 445        lock->refreshing = 1;
 446
 447        dav_headers = get_dav_token_headers(lock, DAV_HEADER_IF | DAV_HEADER_TIMEOUT);
 448
 449        slot = get_active_slot();
 450        slot->results = &results;
 451        curl_setup_http_get(slot->curl, lock->url, DAV_LOCK);
 452        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
 453
 454        if (start_active_slot(slot)) {
 455                run_active_slot(slot);
 456                if (results.curl_result != CURLE_OK) {
 457                        fprintf(stderr, "LOCK HTTP error %ld\n",
 458                                results.http_code);
 459                } else {
 460                        lock->start_time = time(NULL);
 461                        rc = 1;
 462                }
 463        }
 464
 465        lock->refreshing = 0;
 466        curl_slist_free_all(dav_headers);
 467
 468        return rc;
 469}
 470
 471static void check_locks(void)
 472{
 473        struct remote_lock *lock = repo->locks;
 474        time_t current_time = time(NULL);
 475        int time_remaining;
 476
 477        while (lock) {
 478                time_remaining = lock->start_time + lock->timeout -
 479                        current_time;
 480                if (!lock->refreshing && time_remaining < LOCK_REFRESH) {
 481                        if (!refresh_lock(lock)) {
 482                                fprintf(stderr,
 483                                        "Unable to refresh lock for %s\n",
 484                                        lock->url);
 485                                aborted = 1;
 486                                return;
 487                        }
 488                }
 489                lock = lock->next;
 490        }
 491}
 492
 493static void release_request(struct transfer_request *request)
 494{
 495        struct transfer_request *entry = request_queue_head;
 496
 497        if (request == request_queue_head) {
 498                request_queue_head = request->next;
 499        } else {
 500                while (entry->next != NULL && entry->next != request)
 501                        entry = entry->next;
 502                if (entry->next == request)
 503                        entry->next = entry->next->next;
 504        }
 505
 506        free(request->url);
 507        free(request);
 508}
 509
 510static void finish_request(struct transfer_request *request)
 511{
 512        struct http_pack_request *preq;
 513        struct http_object_request *obj_req;
 514
 515        request->curl_result = request->slot->curl_result;
 516        request->http_code = request->slot->http_code;
 517        request->slot = NULL;
 518
 519        /* Keep locks active */
 520        check_locks();
 521
 522        if (request->headers != NULL)
 523                curl_slist_free_all(request->headers);
 524
 525        /* URL is reused for MOVE after PUT */
 526        if (request->state != RUN_PUT) {
 527                free(request->url);
 528                request->url = NULL;
 529        }
 530
 531        if (request->state == RUN_MKCOL) {
 532                if (request->curl_result == CURLE_OK ||
 533                    request->http_code == 405) {
 534                        remote_dir_exists[request->obj->sha1[0]] = 1;
 535                        start_put(request);
 536                } else {
 537                        fprintf(stderr, "MKCOL %s failed, aborting (%d/%ld)\n",
 538                                sha1_to_hex(request->obj->sha1),
 539                                request->curl_result, request->http_code);
 540                        request->state = ABORTED;
 541                        aborted = 1;
 542                }
 543        } else if (request->state == RUN_PUT) {
 544                if (request->curl_result == CURLE_OK) {
 545                        start_move(request);
 546                } else {
 547                        fprintf(stderr, "PUT %s failed, aborting (%d/%ld)\n",
 548                                sha1_to_hex(request->obj->sha1),
 549                                request->curl_result, request->http_code);
 550                        request->state = ABORTED;
 551                        aborted = 1;
 552                }
 553        } else if (request->state == RUN_MOVE) {
 554                if (request->curl_result == CURLE_OK) {
 555                        if (push_verbosely)
 556                                fprintf(stderr, "    sent %s\n",
 557                                        sha1_to_hex(request->obj->sha1));
 558                        request->obj->flags |= REMOTE;
 559                        release_request(request);
 560                } else {
 561                        fprintf(stderr, "MOVE %s failed, aborting (%d/%ld)\n",
 562                                sha1_to_hex(request->obj->sha1),
 563                                request->curl_result, request->http_code);
 564                        request->state = ABORTED;
 565                        aborted = 1;
 566                }
 567        } else if (request->state == RUN_FETCH_LOOSE) {
 568                obj_req = (struct http_object_request *)request->userData;
 569
 570                if (finish_http_object_request(obj_req) == 0)
 571                        if (obj_req->rename == 0)
 572                                request->obj->flags |= (LOCAL | REMOTE);
 573
 574                /* Try fetching packed if necessary */
 575                if (request->obj->flags & LOCAL) {
 576                        release_http_object_request(obj_req);
 577                        release_request(request);
 578                } else
 579                        start_fetch_packed(request);
 580
 581        } else if (request->state == RUN_FETCH_PACKED) {
 582                int fail = 1;
 583                if (request->curl_result != CURLE_OK) {
 584                        fprintf(stderr, "Unable to get pack file %s\n%s",
 585                                request->url, curl_errorstr);
 586                } else {
 587                        preq = (struct http_pack_request *)request->userData;
 588
 589                        if (preq) {
 590                                if (finish_http_pack_request(preq) == 0)
 591                                        fail = 0;
 592                                release_http_pack_request(preq);
 593                        }
 594                }
 595                if (fail)
 596                        repo->can_update_info_refs = 0;
 597                release_request(request);
 598        }
 599}
 600
 601#ifdef USE_CURL_MULTI
 602static int is_running_queue;
 603static int fill_active_slot(void *unused)
 604{
 605        struct transfer_request *request;
 606
 607        if (aborted || !is_running_queue)
 608                return 0;
 609
 610        for (request = request_queue_head; request; request = request->next) {
 611                if (request->state == NEED_FETCH) {
 612                        start_fetch_loose(request);
 613                        return 1;
 614                } else if (pushing && request->state == NEED_PUSH) {
 615                        if (remote_dir_exists[request->obj->sha1[0]] == 1) {
 616                                start_put(request);
 617                        } else {
 618                                start_mkcol(request);
 619                        }
 620                        return 1;
 621                }
 622        }
 623        return 0;
 624}
 625#endif
 626
 627static void get_remote_object_list(unsigned char parent);
 628
 629static void add_fetch_request(struct object *obj)
 630{
 631        struct transfer_request *request;
 632
 633        check_locks();
 634
 635        /*
 636         * Don't fetch the object if it's known to exist locally
 637         * or is already in the request queue
 638         */
 639        if (remote_dir_exists[obj->sha1[0]] == -1)
 640                get_remote_object_list(obj->sha1[0]);
 641        if (obj->flags & (LOCAL | FETCHING))
 642                return;
 643
 644        obj->flags |= FETCHING;
 645        request = xmalloc(sizeof(*request));
 646        request->obj = obj;
 647        request->url = NULL;
 648        request->lock = NULL;
 649        request->headers = NULL;
 650        request->state = NEED_FETCH;
 651        request->next = request_queue_head;
 652        request_queue_head = request;
 653
 654#ifdef USE_CURL_MULTI
 655        fill_active_slots();
 656        step_active_slots();
 657#endif
 658}
 659
 660static int add_send_request(struct object *obj, struct remote_lock *lock)
 661{
 662        struct transfer_request *request = request_queue_head;
 663        struct packed_git *target;
 664
 665        /* Keep locks active */
 666        check_locks();
 667
 668        /*
 669         * Don't push the object if it's known to exist on the remote
 670         * or is already in the request queue
 671         */
 672        if (remote_dir_exists[obj->sha1[0]] == -1)
 673                get_remote_object_list(obj->sha1[0]);
 674        if (obj->flags & (REMOTE | PUSHING))
 675                return 0;
 676        target = find_sha1_pack(obj->sha1, repo->packs);
 677        if (target) {
 678                obj->flags |= REMOTE;
 679                return 0;
 680        }
 681
 682        obj->flags |= PUSHING;
 683        request = xmalloc(sizeof(*request));
 684        request->obj = obj;
 685        request->url = NULL;
 686        request->lock = lock;
 687        request->headers = NULL;
 688        request->state = NEED_PUSH;
 689        request->next = request_queue_head;
 690        request_queue_head = request;
 691
 692#ifdef USE_CURL_MULTI
 693        fill_active_slots();
 694        step_active_slots();
 695#endif
 696
 697        return 1;
 698}
 699
 700static int fetch_indices(void)
 701{
 702        int ret;
 703
 704        if (push_verbosely)
 705                fprintf(stderr, "Getting pack list\n");
 706
 707        switch (http_get_info_packs(repo->url, &repo->packs)) {
 708        case HTTP_OK:
 709        case HTTP_MISSING_TARGET:
 710                ret = 0;
 711                break;
 712        default:
 713                ret = -1;
 714        }
 715
 716        return ret;
 717}
 718
 719static void one_remote_object(const char *hex)
 720{
 721        unsigned char sha1[20];
 722        struct object *obj;
 723
 724        if (get_sha1_hex(hex, sha1) != 0)
 725                return;
 726
 727        obj = lookup_object(sha1);
 728        if (!obj)
 729                obj = parse_object(sha1);
 730
 731        /* Ignore remote objects that don't exist locally */
 732        if (!obj)
 733                return;
 734
 735        obj->flags |= REMOTE;
 736        if (!object_list_contains(objects, obj))
 737                object_list_insert(obj, &objects);
 738}
 739
 740static void handle_lockprop_ctx(struct xml_ctx *ctx, int tag_closed)
 741{
 742        int *lock_flags = (int *)ctx->userData;
 743
 744        if (tag_closed) {
 745                if (!strcmp(ctx->name, DAV_CTX_LOCKENTRY)) {
 746                        if ((*lock_flags & DAV_PROP_LOCKEX) &&
 747                            (*lock_flags & DAV_PROP_LOCKWR)) {
 748                                *lock_flags |= DAV_LOCK_OK;
 749                        }
 750                        *lock_flags &= DAV_LOCK_OK;
 751                } else if (!strcmp(ctx->name, DAV_CTX_LOCKTYPE_WRITE)) {
 752                        *lock_flags |= DAV_PROP_LOCKWR;
 753                } else if (!strcmp(ctx->name, DAV_CTX_LOCKTYPE_EXCLUSIVE)) {
 754                        *lock_flags |= DAV_PROP_LOCKEX;
 755                }
 756        }
 757}
 758
 759static void handle_new_lock_ctx(struct xml_ctx *ctx, int tag_closed)
 760{
 761        struct remote_lock *lock = (struct remote_lock *)ctx->userData;
 762        git_SHA_CTX sha_ctx;
 763        unsigned char lock_token_sha1[20];
 764
 765        if (tag_closed && ctx->cdata) {
 766                if (!strcmp(ctx->name, DAV_ACTIVELOCK_OWNER)) {
 767                        lock->owner = xmalloc(strlen(ctx->cdata) + 1);
 768                        strcpy(lock->owner, ctx->cdata);
 769                } else if (!strcmp(ctx->name, DAV_ACTIVELOCK_TIMEOUT)) {
 770                        if (!prefixcmp(ctx->cdata, "Second-"))
 771                                lock->timeout =
 772                                        strtol(ctx->cdata + 7, NULL, 10);
 773                } else if (!strcmp(ctx->name, DAV_ACTIVELOCK_TOKEN)) {
 774                        lock->token = xmalloc(strlen(ctx->cdata) + 1);
 775                        strcpy(lock->token, ctx->cdata);
 776
 777                        git_SHA1_Init(&sha_ctx);
 778                        git_SHA1_Update(&sha_ctx, lock->token, strlen(lock->token));
 779                        git_SHA1_Final(lock_token_sha1, &sha_ctx);
 780
 781                        lock->tmpfile_suffix[0] = '_';
 782                        memcpy(lock->tmpfile_suffix + 1, sha1_to_hex(lock_token_sha1), 40);
 783                }
 784        }
 785}
 786
 787static void one_remote_ref(const char *refname);
 788
 789static void
 790xml_start_tag(void *userData, const char *name, const char **atts)
 791{
 792        struct xml_ctx *ctx = (struct xml_ctx *)userData;
 793        const char *c = strchr(name, ':');
 794        int new_len;
 795
 796        if (c == NULL)
 797                c = name;
 798        else
 799                c++;
 800
 801        new_len = strlen(ctx->name) + strlen(c) + 2;
 802
 803        if (new_len > ctx->len) {
 804                ctx->name = xrealloc(ctx->name, new_len);
 805                ctx->len = new_len;
 806        }
 807        strcat(ctx->name, ".");
 808        strcat(ctx->name, c);
 809
 810        free(ctx->cdata);
 811        ctx->cdata = NULL;
 812
 813        ctx->userFunc(ctx, 0);
 814}
 815
 816static void
 817xml_end_tag(void *userData, const char *name)
 818{
 819        struct xml_ctx *ctx = (struct xml_ctx *)userData;
 820        const char *c = strchr(name, ':');
 821        char *ep;
 822
 823        ctx->userFunc(ctx, 1);
 824
 825        if (c == NULL)
 826                c = name;
 827        else
 828                c++;
 829
 830        ep = ctx->name + strlen(ctx->name) - strlen(c) - 1;
 831        *ep = 0;
 832}
 833
 834static void
 835xml_cdata(void *userData, const XML_Char *s, int len)
 836{
 837        struct xml_ctx *ctx = (struct xml_ctx *)userData;
 838        free(ctx->cdata);
 839        ctx->cdata = xmemdupz(s, len);
 840}
 841
 842static struct remote_lock *lock_remote(const char *path, long timeout)
 843{
 844        struct active_request_slot *slot;
 845        struct slot_results results;
 846        struct buffer out_buffer = { STRBUF_INIT, 0 };
 847        struct strbuf in_buffer = STRBUF_INIT;
 848        char *url;
 849        char *ep;
 850        char timeout_header[25];
 851        struct remote_lock *lock = NULL;
 852        struct curl_slist *dav_headers = NULL;
 853        struct xml_ctx ctx;
 854        char *escaped;
 855
 856        url = xmalloc(strlen(repo->url) + strlen(path) + 1);
 857        sprintf(url, "%s%s", repo->url, path);
 858
 859        /* Make sure leading directories exist for the remote ref */
 860        ep = strchr(url + strlen(repo->url) + 1, '/');
 861        while (ep) {
 862                char saved_character = ep[1];
 863                ep[1] = '\0';
 864                slot = get_active_slot();
 865                slot->results = &results;
 866                curl_setup_http_get(slot->curl, url, DAV_MKCOL);
 867                if (start_active_slot(slot)) {
 868                        run_active_slot(slot);
 869                        if (results.curl_result != CURLE_OK &&
 870                            results.http_code != 405) {
 871                                fprintf(stderr,
 872                                        "Unable to create branch path %s\n",
 873                                        url);
 874                                free(url);
 875                                return NULL;
 876                        }
 877                } else {
 878                        fprintf(stderr, "Unable to start MKCOL request\n");
 879                        free(url);
 880                        return NULL;
 881                }
 882                ep[1] = saved_character;
 883                ep = strchr(ep + 1, '/');
 884        }
 885
 886        escaped = xml_entities(ident_default_email());
 887        strbuf_addf(&out_buffer.buf, LOCK_REQUEST, escaped);
 888        free(escaped);
 889
 890        sprintf(timeout_header, "Timeout: Second-%ld", timeout);
 891        dav_headers = curl_slist_append(dav_headers, timeout_header);
 892        dav_headers = curl_slist_append(dav_headers, "Content-Type: text/xml");
 893
 894        slot = get_active_slot();
 895        slot->results = &results;
 896        curl_setup_http(slot->curl, url, DAV_LOCK, &out_buffer, fwrite_buffer);
 897        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
 898        curl_easy_setopt(slot->curl, CURLOPT_FILE, &in_buffer);
 899
 900        lock = xcalloc(1, sizeof(*lock));
 901        lock->timeout = -1;
 902
 903        if (start_active_slot(slot)) {
 904                run_active_slot(slot);
 905                if (results.curl_result == CURLE_OK) {
 906                        XML_Parser parser = XML_ParserCreate(NULL);
 907                        enum XML_Status result;
 908                        ctx.name = xcalloc(10, 1);
 909                        ctx.len = 0;
 910                        ctx.cdata = NULL;
 911                        ctx.userFunc = handle_new_lock_ctx;
 912                        ctx.userData = lock;
 913                        XML_SetUserData(parser, &ctx);
 914                        XML_SetElementHandler(parser, xml_start_tag,
 915                                              xml_end_tag);
 916                        XML_SetCharacterDataHandler(parser, xml_cdata);
 917                        result = XML_Parse(parser, in_buffer.buf,
 918                                           in_buffer.len, 1);
 919                        free(ctx.name);
 920                        if (result != XML_STATUS_OK) {
 921                                fprintf(stderr, "XML error: %s\n",
 922                                        XML_ErrorString(
 923                                                XML_GetErrorCode(parser)));
 924                                lock->timeout = -1;
 925                        }
 926                        XML_ParserFree(parser);
 927                }
 928        } else {
 929                fprintf(stderr, "Unable to start LOCK request\n");
 930        }
 931
 932        curl_slist_free_all(dav_headers);
 933        strbuf_release(&out_buffer.buf);
 934        strbuf_release(&in_buffer);
 935
 936        if (lock->token == NULL || lock->timeout <= 0) {
 937                free(lock->token);
 938                free(lock->owner);
 939                free(url);
 940                free(lock);
 941                lock = NULL;
 942        } else {
 943                lock->url = url;
 944                lock->start_time = time(NULL);
 945                lock->next = repo->locks;
 946                repo->locks = lock;
 947        }
 948
 949        return lock;
 950}
 951
 952static int unlock_remote(struct remote_lock *lock)
 953{
 954        struct active_request_slot *slot;
 955        struct slot_results results;
 956        struct remote_lock *prev = repo->locks;
 957        struct curl_slist *dav_headers;
 958        int rc = 0;
 959
 960        dav_headers = get_dav_token_headers(lock, DAV_HEADER_LOCK);
 961
 962        slot = get_active_slot();
 963        slot->results = &results;
 964        curl_setup_http_get(slot->curl, lock->url, DAV_UNLOCK);
 965        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
 966
 967        if (start_active_slot(slot)) {
 968                run_active_slot(slot);
 969                if (results.curl_result == CURLE_OK)
 970                        rc = 1;
 971                else
 972                        fprintf(stderr, "UNLOCK HTTP error %ld\n",
 973                                results.http_code);
 974        } else {
 975                fprintf(stderr, "Unable to start UNLOCK request\n");
 976        }
 977
 978        curl_slist_free_all(dav_headers);
 979
 980        if (repo->locks == lock) {
 981                repo->locks = lock->next;
 982        } else {
 983                while (prev && prev->next != lock)
 984                        prev = prev->next;
 985                if (prev)
 986                        prev->next = prev->next->next;
 987        }
 988
 989        free(lock->owner);
 990        free(lock->url);
 991        free(lock->token);
 992        free(lock);
 993
 994        return rc;
 995}
 996
 997static void remove_locks(void)
 998{
 999        struct remote_lock *lock = repo->locks;
1000
1001        fprintf(stderr, "Removing remote locks...\n");
1002        while (lock) {
1003                struct remote_lock *next = lock->next;
1004                unlock_remote(lock);
1005                lock = next;
1006        }
1007}
1008
1009static void remove_locks_on_signal(int signo)
1010{
1011        remove_locks();
1012        sigchain_pop(signo);
1013        raise(signo);
1014}
1015
1016static void remote_ls(const char *path, int flags,
1017                      void (*userFunc)(struct remote_ls_ctx *ls),
1018                      void *userData);
1019
1020static void process_ls_object(struct remote_ls_ctx *ls)
1021{
1022        unsigned int *parent = (unsigned int *)ls->userData;
1023        char *path = ls->dentry_name;
1024        char *obj_hex;
1025
1026        if (!strcmp(ls->path, ls->dentry_name) && (ls->flags & IS_DIR)) {
1027                remote_dir_exists[*parent] = 1;
1028                return;
1029        }
1030
1031        if (strlen(path) != 49)
1032                return;
1033        path += 8;
1034        obj_hex = xmalloc(strlen(path));
1035        /* NB: path is not null-terminated, can not use strlcpy here */
1036        memcpy(obj_hex, path, 2);
1037        strcpy(obj_hex + 2, path + 3);
1038        one_remote_object(obj_hex);
1039        free(obj_hex);
1040}
1041
1042static void process_ls_ref(struct remote_ls_ctx *ls)
1043{
1044        if (!strcmp(ls->path, ls->dentry_name) && (ls->dentry_flags & IS_DIR)) {
1045                fprintf(stderr, "  %s\n", ls->dentry_name);
1046                return;
1047        }
1048
1049        if (!(ls->dentry_flags & IS_DIR))
1050                one_remote_ref(ls->dentry_name);
1051}
1052
1053static void handle_remote_ls_ctx(struct xml_ctx *ctx, int tag_closed)
1054{
1055        struct remote_ls_ctx *ls = (struct remote_ls_ctx *)ctx->userData;
1056
1057        if (tag_closed) {
1058                if (!strcmp(ctx->name, DAV_PROPFIND_RESP) && ls->dentry_name) {
1059                        if (ls->dentry_flags & IS_DIR) {
1060
1061                                /* ensure collection names end with slash */
1062                                str_end_url_with_slash(ls->dentry_name, &ls->dentry_name);
1063
1064                                if (ls->flags & PROCESS_DIRS) {
1065                                        ls->userFunc(ls);
1066                                }
1067                                if (strcmp(ls->dentry_name, ls->path) &&
1068                                    ls->flags & RECURSIVE) {
1069                                        remote_ls(ls->dentry_name,
1070                                                  ls->flags,
1071                                                  ls->userFunc,
1072                                                  ls->userData);
1073                                }
1074                        } else if (ls->flags & PROCESS_FILES) {
1075                                ls->userFunc(ls);
1076                        }
1077                } else if (!strcmp(ctx->name, DAV_PROPFIND_NAME) && ctx->cdata) {
1078                        char *path = ctx->cdata;
1079                        if (*ctx->cdata == 'h') {
1080                                path = strstr(path, "//");
1081                                if (path) {
1082                                        path = strchr(path+2, '/');
1083                                }
1084                        }
1085                        if (path) {
1086                                const char *url = repo->url;
1087                                if (repo->path)
1088                                        url = repo->path;
1089                                if (strncmp(path, url, repo->path_len))
1090                                        error("Parsed path '%s' does not match url: '%s'",
1091                                              path, url);
1092                                else {
1093                                        path += repo->path_len;
1094                                        ls->dentry_name = xstrdup(path);
1095                                }
1096                        }
1097                } else if (!strcmp(ctx->name, DAV_PROPFIND_COLLECTION)) {
1098                        ls->dentry_flags |= IS_DIR;
1099                }
1100        } else if (!strcmp(ctx->name, DAV_PROPFIND_RESP)) {
1101                free(ls->dentry_name);
1102                ls->dentry_name = NULL;
1103                ls->dentry_flags = 0;
1104        }
1105}
1106
1107/*
1108 * NEEDSWORK: remote_ls() ignores info/refs on the remote side.  But it
1109 * should _only_ heed the information from that file, instead of trying to
1110 * determine the refs from the remote file system (badly: it does not even
1111 * know about packed-refs).
1112 */
1113static void remote_ls(const char *path, int flags,
1114                      void (*userFunc)(struct remote_ls_ctx *ls),
1115                      void *userData)
1116{
1117        char *url = xmalloc(strlen(repo->url) + strlen(path) + 1);
1118        struct active_request_slot *slot;
1119        struct slot_results results;
1120        struct strbuf in_buffer = STRBUF_INIT;
1121        struct buffer out_buffer = { STRBUF_INIT, 0 };
1122        struct curl_slist *dav_headers = NULL;
1123        struct xml_ctx ctx;
1124        struct remote_ls_ctx ls;
1125
1126        ls.flags = flags;
1127        ls.path = xstrdup(path);
1128        ls.dentry_name = NULL;
1129        ls.dentry_flags = 0;
1130        ls.userData = userData;
1131        ls.userFunc = userFunc;
1132
1133        sprintf(url, "%s%s", repo->url, path);
1134
1135        strbuf_addf(&out_buffer.buf, PROPFIND_ALL_REQUEST);
1136
1137        dav_headers = curl_slist_append(dav_headers, "Depth: 1");
1138        dav_headers = curl_slist_append(dav_headers, "Content-Type: text/xml");
1139
1140        slot = get_active_slot();
1141        slot->results = &results;
1142        curl_setup_http(slot->curl, url, DAV_PROPFIND,
1143                        &out_buffer, fwrite_buffer);
1144        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
1145        curl_easy_setopt(slot->curl, CURLOPT_FILE, &in_buffer);
1146
1147        if (start_active_slot(slot)) {
1148                run_active_slot(slot);
1149                if (results.curl_result == CURLE_OK) {
1150                        XML_Parser parser = XML_ParserCreate(NULL);
1151                        enum XML_Status result;
1152                        ctx.name = xcalloc(10, 1);
1153                        ctx.len = 0;
1154                        ctx.cdata = NULL;
1155                        ctx.userFunc = handle_remote_ls_ctx;
1156                        ctx.userData = &ls;
1157                        XML_SetUserData(parser, &ctx);
1158                        XML_SetElementHandler(parser, xml_start_tag,
1159                                              xml_end_tag);
1160                        XML_SetCharacterDataHandler(parser, xml_cdata);
1161                        result = XML_Parse(parser, in_buffer.buf,
1162                                           in_buffer.len, 1);
1163                        free(ctx.name);
1164
1165                        if (result != XML_STATUS_OK) {
1166                                fprintf(stderr, "XML error: %s\n",
1167                                        XML_ErrorString(
1168                                                XML_GetErrorCode(parser)));
1169                        }
1170                        XML_ParserFree(parser);
1171                }
1172        } else {
1173                fprintf(stderr, "Unable to start PROPFIND request\n");
1174        }
1175
1176        free(ls.path);
1177        free(url);
1178        strbuf_release(&out_buffer.buf);
1179        strbuf_release(&in_buffer);
1180        curl_slist_free_all(dav_headers);
1181}
1182
1183static void get_remote_object_list(unsigned char parent)
1184{
1185        char path[] = "objects/XX/";
1186        static const char hex[] = "0123456789abcdef";
1187        unsigned int val = parent;
1188
1189        path[8] = hex[val >> 4];
1190        path[9] = hex[val & 0xf];
1191        remote_dir_exists[val] = 0;
1192        remote_ls(path, (PROCESS_FILES | PROCESS_DIRS),
1193                  process_ls_object, &val);
1194}
1195
1196static int locking_available(void)
1197{
1198        struct active_request_slot *slot;
1199        struct slot_results results;
1200        struct strbuf in_buffer = STRBUF_INIT;
1201        struct buffer out_buffer = { STRBUF_INIT, 0 };
1202        struct curl_slist *dav_headers = NULL;
1203        struct xml_ctx ctx;
1204        int lock_flags = 0;
1205        char *escaped;
1206
1207        escaped = xml_entities(repo->url);
1208        strbuf_addf(&out_buffer.buf, PROPFIND_SUPPORTEDLOCK_REQUEST, escaped);
1209        free(escaped);
1210
1211        dav_headers = curl_slist_append(dav_headers, "Depth: 0");
1212        dav_headers = curl_slist_append(dav_headers, "Content-Type: text/xml");
1213
1214        slot = get_active_slot();
1215        slot->results = &results;
1216        curl_setup_http(slot->curl, repo->url, DAV_PROPFIND,
1217                        &out_buffer, fwrite_buffer);
1218        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
1219        curl_easy_setopt(slot->curl, CURLOPT_FILE, &in_buffer);
1220
1221        if (start_active_slot(slot)) {
1222                run_active_slot(slot);
1223                if (results.curl_result == CURLE_OK) {
1224                        XML_Parser parser = XML_ParserCreate(NULL);
1225                        enum XML_Status result;
1226                        ctx.name = xcalloc(10, 1);
1227                        ctx.len = 0;
1228                        ctx.cdata = NULL;
1229                        ctx.userFunc = handle_lockprop_ctx;
1230                        ctx.userData = &lock_flags;
1231                        XML_SetUserData(parser, &ctx);
1232                        XML_SetElementHandler(parser, xml_start_tag,
1233                                              xml_end_tag);
1234                        result = XML_Parse(parser, in_buffer.buf,
1235                                           in_buffer.len, 1);
1236                        free(ctx.name);
1237
1238                        if (result != XML_STATUS_OK) {
1239                                fprintf(stderr, "XML error: %s\n",
1240                                        XML_ErrorString(
1241                                                XML_GetErrorCode(parser)));
1242                                lock_flags = 0;
1243                        }
1244                        XML_ParserFree(parser);
1245                        if (!lock_flags)
1246                                error("no DAV locking support on %s",
1247                                      repo->url);
1248
1249                } else {
1250                        error("Cannot access URL %s, return code %d",
1251                              repo->url, results.curl_result);
1252                        lock_flags = 0;
1253                }
1254        } else {
1255                error("Unable to start PROPFIND request on %s", repo->url);
1256        }
1257
1258        strbuf_release(&out_buffer.buf);
1259        strbuf_release(&in_buffer);
1260        curl_slist_free_all(dav_headers);
1261
1262        return lock_flags;
1263}
1264
1265static struct object_list **add_one_object(struct object *obj, struct object_list **p)
1266{
1267        struct object_list *entry = xmalloc(sizeof(struct object_list));
1268        entry->item = obj;
1269        entry->next = *p;
1270        *p = entry;
1271        return &entry->next;
1272}
1273
1274static struct object_list **process_blob(struct blob *blob,
1275                                         struct object_list **p,
1276                                         struct name_path *path,
1277                                         const char *name)
1278{
1279        struct object *obj = &blob->object;
1280
1281        obj->flags |= LOCAL;
1282
1283        if (obj->flags & (UNINTERESTING | SEEN))
1284                return p;
1285
1286        obj->flags |= SEEN;
1287        return add_one_object(obj, p);
1288}
1289
1290static struct object_list **process_tree(struct tree *tree,
1291                                         struct object_list **p,
1292                                         struct name_path *path,
1293                                         const char *name)
1294{
1295        struct object *obj = &tree->object;
1296        struct tree_desc desc;
1297        struct name_entry entry;
1298        struct name_path me;
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", sha1_to_hex(obj->sha1));
1306
1307        obj->flags |= SEEN;
1308        name = xstrdup(name);
1309        p = add_one_object(obj, p);
1310        me.up = path;
1311        me.elem = name;
1312        me.elem_len = strlen(name);
1313
1314        init_tree_desc(&desc, tree->buffer, tree->size);
1315
1316        while (tree_entry(&desc, &entry))
1317                switch (object_type(entry.mode)) {
1318                case OBJ_TREE:
1319                        p = process_tree(lookup_tree(entry.sha1), p, &me, name);
1320                        break;
1321                case OBJ_BLOB:
1322                        p = process_blob(lookup_blob(entry.sha1), p, &me, name);
1323                        break;
1324                default:
1325                        /* Subproject commit - not in this repository */
1326                        break;
1327                }
1328
1329        free(tree->buffer);
1330        tree->buffer = NULL;
1331        return p;
1332}
1333
1334static int get_delta(struct rev_info *revs, struct remote_lock *lock)
1335{
1336        int i;
1337        struct commit *commit;
1338        struct object_list **p = &objects;
1339        int count = 0;
1340
1341        while ((commit = get_revision(revs)) != NULL) {
1342                p = process_tree(commit->tree, p, NULL, "");
1343                commit->object.flags |= LOCAL;
1344                if (!(commit->object.flags & UNINTERESTING))
1345                        count += add_send_request(&commit->object, lock);
1346        }
1347
1348        for (i = 0; i < revs->pending.nr; i++) {
1349                struct object_array_entry *entry = revs->pending.objects + i;
1350                struct object *obj = entry->item;
1351                const char *name = entry->name;
1352
1353                if (obj->flags & (UNINTERESTING | SEEN))
1354                        continue;
1355                if (obj->type == OBJ_TAG) {
1356                        obj->flags |= SEEN;
1357                        p = add_one_object(obj, p);
1358                        continue;
1359                }
1360                if (obj->type == OBJ_TREE) {
1361                        p = process_tree((struct tree *)obj, p, NULL, name);
1362                        continue;
1363                }
1364                if (obj->type == OBJ_BLOB) {
1365                        p = process_blob((struct blob *)obj, p, NULL, name);
1366                        continue;
1367                }
1368                die("unknown pending object %s (%s)", sha1_to_hex(obj->sha1), name);
1369        }
1370
1371        while (objects) {
1372                if (!(objects->item->flags & UNINTERESTING))
1373                        count += add_send_request(objects->item, lock);
1374                objects = objects->next;
1375        }
1376
1377        return count;
1378}
1379
1380static int update_remote(unsigned char *sha1, struct remote_lock *lock)
1381{
1382        struct active_request_slot *slot;
1383        struct slot_results results;
1384        struct buffer out_buffer = { STRBUF_INIT, 0 };
1385        struct curl_slist *dav_headers;
1386
1387        dav_headers = get_dav_token_headers(lock, DAV_HEADER_IF);
1388
1389        strbuf_addf(&out_buffer.buf, "%s\n", sha1_to_hex(sha1));
1390
1391        slot = get_active_slot();
1392        slot->results = &results;
1393        curl_setup_http(slot->curl, lock->url, DAV_PUT,
1394                        &out_buffer, fwrite_null);
1395        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
1396
1397        if (start_active_slot(slot)) {
1398                run_active_slot(slot);
1399                strbuf_release(&out_buffer.buf);
1400                if (results.curl_result != CURLE_OK) {
1401                        fprintf(stderr,
1402                                "PUT error: curl result=%d, HTTP code=%ld\n",
1403                                results.curl_result, results.http_code);
1404                        /* We should attempt recovery? */
1405                        return 0;
1406                }
1407        } else {
1408                strbuf_release(&out_buffer.buf);
1409                fprintf(stderr, "Unable to start PUT request\n");
1410                return 0;
1411        }
1412
1413        return 1;
1414}
1415
1416static struct ref *remote_refs;
1417
1418static void one_remote_ref(const char *refname)
1419{
1420        struct ref *ref;
1421        struct object *obj;
1422
1423        ref = alloc_ref(refname);
1424
1425        if (http_fetch_ref(repo->url, ref) != 0) {
1426                fprintf(stderr,
1427                        "Unable to fetch ref %s from %s\n",
1428                        refname, repo->url);
1429                free(ref);
1430                return;
1431        }
1432
1433        /*
1434         * Fetch a copy of the object if it doesn't exist locally - it
1435         * may be required for updating server info later.
1436         */
1437        if (repo->can_update_info_refs && !has_sha1_file(ref->old_sha1)) {
1438                obj = lookup_unknown_object(ref->old_sha1);
1439                if (obj) {
1440                        fprintf(stderr, "  fetch %s for %s\n",
1441                                sha1_to_hex(ref->old_sha1), refname);
1442                        add_fetch_request(obj);
1443                }
1444        }
1445
1446        ref->next = remote_refs;
1447        remote_refs = ref;
1448}
1449
1450static void get_dav_remote_heads(void)
1451{
1452        remote_ls("refs/", (PROCESS_FILES | PROCESS_DIRS | RECURSIVE), process_ls_ref, NULL);
1453}
1454
1455static void add_remote_info_ref(struct remote_ls_ctx *ls)
1456{
1457        struct strbuf *buf = (struct strbuf *)ls->userData;
1458        struct object *o;
1459        int len;
1460        char *ref_info;
1461        struct ref *ref;
1462
1463        ref = alloc_ref(ls->dentry_name);
1464
1465        if (http_fetch_ref(repo->url, ref) != 0) {
1466                fprintf(stderr,
1467                        "Unable to fetch ref %s from %s\n",
1468                        ls->dentry_name, repo->url);
1469                aborted = 1;
1470                free(ref);
1471                return;
1472        }
1473
1474        o = parse_object(ref->old_sha1);
1475        if (!o) {
1476                fprintf(stderr,
1477                        "Unable to parse object %s for remote ref %s\n",
1478                        sha1_to_hex(ref->old_sha1), ls->dentry_name);
1479                aborted = 1;
1480                free(ref);
1481                return;
1482        }
1483
1484        len = strlen(ls->dentry_name) + 42;
1485        ref_info = xcalloc(len + 1, 1);
1486        sprintf(ref_info, "%s   %s\n",
1487                sha1_to_hex(ref->old_sha1), ls->dentry_name);
1488        fwrite_buffer(ref_info, 1, len, buf);
1489        free(ref_info);
1490
1491        if (o->type == OBJ_TAG) {
1492                o = deref_tag(o, ls->dentry_name, 0);
1493                if (o) {
1494                        len = strlen(ls->dentry_name) + 45;
1495                        ref_info = xcalloc(len + 1, 1);
1496                        sprintf(ref_info, "%s   %s^{}\n",
1497                                sha1_to_hex(o->sha1), ls->dentry_name);
1498                        fwrite_buffer(ref_info, 1, len, buf);
1499                        free(ref_info);
1500                }
1501        }
1502        free(ref);
1503}
1504
1505static void update_remote_info_refs(struct remote_lock *lock)
1506{
1507        struct buffer buffer = { STRBUF_INIT, 0 };
1508        struct active_request_slot *slot;
1509        struct slot_results results;
1510        struct curl_slist *dav_headers;
1511
1512        remote_ls("refs/", (PROCESS_FILES | RECURSIVE),
1513                  add_remote_info_ref, &buffer.buf);
1514        if (!aborted) {
1515                dav_headers = get_dav_token_headers(lock, DAV_HEADER_IF);
1516
1517                slot = get_active_slot();
1518                slot->results = &results;
1519                curl_setup_http(slot->curl, lock->url, DAV_PUT,
1520                                &buffer, fwrite_null);
1521                curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
1522
1523                if (start_active_slot(slot)) {
1524                        run_active_slot(slot);
1525                        if (results.curl_result != CURLE_OK) {
1526                                fprintf(stderr,
1527                                        "PUT error: curl result=%d, HTTP code=%ld\n",
1528                                        results.curl_result, results.http_code);
1529                        }
1530                }
1531        }
1532        strbuf_release(&buffer.buf);
1533}
1534
1535static int remote_exists(const char *path)
1536{
1537        char *url = xmalloc(strlen(repo->url) + strlen(path) + 1);
1538        int ret;
1539
1540        sprintf(url, "%s%s", repo->url, path);
1541
1542        switch (http_get_strbuf(url, NULL, 0)) {
1543        case HTTP_OK:
1544                ret = 1;
1545                break;
1546        case HTTP_MISSING_TARGET:
1547                ret = 0;
1548                break;
1549        case HTTP_ERROR:
1550                http_error(url, HTTP_ERROR);
1551        default:
1552                ret = -1;
1553        }
1554        free(url);
1555        return ret;
1556}
1557
1558static void fetch_symref(const char *path, char **symref, unsigned char *sha1)
1559{
1560        char *url;
1561        struct strbuf buffer = STRBUF_INIT;
1562
1563        url = xmalloc(strlen(repo->url) + strlen(path) + 1);
1564        sprintf(url, "%s%s", repo->url, path);
1565
1566        if (http_get_strbuf(url, &buffer, 0) != HTTP_OK)
1567                die("Couldn't get %s for remote symref\n%s", url,
1568                    curl_errorstr);
1569        free(url);
1570
1571        free(*symref);
1572        *symref = NULL;
1573        hashclr(sha1);
1574
1575        if (buffer.len == 0)
1576                return;
1577
1578        /* If it's a symref, set the refname; otherwise try for a sha1 */
1579        if (!prefixcmp((char *)buffer.buf, "ref: ")) {
1580                *symref = xmemdupz((char *)buffer.buf + 5, buffer.len - 6);
1581        } else {
1582                get_sha1_hex(buffer.buf, sha1);
1583        }
1584
1585        strbuf_release(&buffer);
1586}
1587
1588static int verify_merge_base(unsigned char *head_sha1, struct ref *remote)
1589{
1590        struct commit *head = lookup_commit_or_die(head_sha1, "HEAD");
1591        struct commit *branch = lookup_commit_or_die(remote->old_sha1, remote->name);
1592
1593        return in_merge_bases(branch, head);
1594}
1595
1596static int delete_remote_branch(const char *pattern, int force)
1597{
1598        struct ref *refs = remote_refs;
1599        struct ref *remote_ref = NULL;
1600        unsigned char head_sha1[20];
1601        char *symref = NULL;
1602        int match;
1603        int patlen = strlen(pattern);
1604        int i;
1605        struct active_request_slot *slot;
1606        struct slot_results results;
1607        char *url;
1608
1609        /* Find the remote branch(es) matching the specified branch name */
1610        for (match = 0; refs; refs = refs->next) {
1611                char *name = refs->name;
1612                int namelen = strlen(name);
1613                if (namelen < patlen ||
1614                    memcmp(name + namelen - patlen, pattern, patlen))
1615                        continue;
1616                if (namelen != patlen && name[namelen - patlen - 1] != '/')
1617                        continue;
1618                match++;
1619                remote_ref = refs;
1620        }
1621        if (match == 0)
1622                return error("No remote branch matches %s", pattern);
1623        if (match != 1)
1624                return error("More than one remote branch matches %s",
1625                             pattern);
1626
1627        /*
1628         * Remote HEAD must be a symref (not exactly foolproof; a remote
1629         * symlink to a symref will look like a symref)
1630         */
1631        fetch_symref("HEAD", &symref, head_sha1);
1632        if (!symref)
1633                return error("Remote HEAD is not a symref");
1634
1635        /* Remote branch must not be the remote HEAD */
1636        for (i = 0; symref && i < MAXDEPTH; i++) {
1637                if (!strcmp(remote_ref->name, symref))
1638                        return error("Remote branch %s is the current HEAD",
1639                                     remote_ref->name);
1640                fetch_symref(symref, &symref, head_sha1);
1641        }
1642
1643        /* Run extra sanity checks if delete is not forced */
1644        if (!force) {
1645                /* Remote HEAD must resolve to a known object */
1646                if (symref)
1647                        return error("Remote HEAD symrefs too deep");
1648                if (is_null_sha1(head_sha1))
1649                        return error("Unable to resolve remote HEAD");
1650                if (!has_sha1_file(head_sha1))
1651                        return error("Remote HEAD resolves to object %s\nwhich does not exist locally, perhaps you need to fetch?", sha1_to_hex(head_sha1));
1652
1653                /* Remote branch must resolve to a known object */
1654                if (is_null_sha1(remote_ref->old_sha1))
1655                        return error("Unable to resolve remote branch %s",
1656                                     remote_ref->name);
1657                if (!has_sha1_file(remote_ref->old_sha1))
1658                        return error("Remote branch %s resolves to object %s\nwhich does not exist locally, perhaps you need to fetch?", remote_ref->name, sha1_to_hex(remote_ref->old_sha1));
1659
1660                /* Remote branch must be an ancestor of remote HEAD */
1661                if (!verify_merge_base(head_sha1, remote_ref)) {
1662                        return error("The branch '%s' is not an ancestor "
1663                                     "of your current HEAD.\n"
1664                                     "If you are sure you want to delete it,"
1665                                     " run:\n\t'git http-push -D %s %s'",
1666                                     remote_ref->name, repo->url, pattern);
1667                }
1668        }
1669
1670        /* Send delete request */
1671        fprintf(stderr, "Removing remote branch '%s'\n", remote_ref->name);
1672        if (dry_run)
1673                return 0;
1674        url = xmalloc(strlen(repo->url) + strlen(remote_ref->name) + 1);
1675        sprintf(url, "%s%s", repo->url, remote_ref->name);
1676        slot = get_active_slot();
1677        slot->results = &results;
1678        curl_setup_http_get(slot->curl, url, DAV_DELETE);
1679        if (start_active_slot(slot)) {
1680                run_active_slot(slot);
1681                free(url);
1682                if (results.curl_result != CURLE_OK)
1683                        return error("DELETE request failed (%d/%ld)",
1684                                     results.curl_result, results.http_code);
1685        } else {
1686                free(url);
1687                return error("Unable to start DELETE request");
1688        }
1689
1690        return 0;
1691}
1692
1693static void run_request_queue(void)
1694{
1695#ifdef USE_CURL_MULTI
1696        is_running_queue = 1;
1697        fill_active_slots();
1698        add_fill_function(NULL, fill_active_slot);
1699#endif
1700        do {
1701                finish_all_active_slots();
1702#ifdef USE_CURL_MULTI
1703                fill_active_slots();
1704#endif
1705        } while (request_queue_head && !aborted);
1706
1707#ifdef USE_CURL_MULTI
1708        is_running_queue = 0;
1709#endif
1710}
1711
1712int main(int argc, char **argv)
1713{
1714        struct transfer_request *request;
1715        struct transfer_request *next_request;
1716        int nr_refspec = 0;
1717        char **refspec = NULL;
1718        struct remote_lock *ref_lock = NULL;
1719        struct remote_lock *info_ref_lock = NULL;
1720        struct rev_info revs;
1721        int delete_branch = 0;
1722        int force_delete = 0;
1723        int objects_to_send;
1724        int rc = 0;
1725        int i;
1726        int new_refs;
1727        struct ref *ref, *local_refs;
1728
1729        git_setup_gettext();
1730
1731        git_extract_argv0_path(argv[0]);
1732
1733        repo = xcalloc(sizeof(*repo), 1);
1734
1735        argv++;
1736        for (i = 1; i < argc; i++, argv++) {
1737                char *arg = *argv;
1738
1739                if (*arg == '-') {
1740                        if (!strcmp(arg, "--all")) {
1741                                push_all = MATCH_REFS_ALL;
1742                                continue;
1743                        }
1744                        if (!strcmp(arg, "--force")) {
1745                                force_all = 1;
1746                                continue;
1747                        }
1748                        if (!strcmp(arg, "--dry-run")) {
1749                                dry_run = 1;
1750                                continue;
1751                        }
1752                        if (!strcmp(arg, "--helper-status")) {
1753                                helper_status = 1;
1754                                continue;
1755                        }
1756                        if (!strcmp(arg, "--verbose")) {
1757                                push_verbosely = 1;
1758                                http_is_verbose = 1;
1759                                continue;
1760                        }
1761                        if (!strcmp(arg, "-d")) {
1762                                delete_branch = 1;
1763                                continue;
1764                        }
1765                        if (!strcmp(arg, "-D")) {
1766                                delete_branch = 1;
1767                                force_delete = 1;
1768                                continue;
1769                        }
1770                        if (!strcmp(arg, "-h"))
1771                                usage(http_push_usage);
1772                }
1773                if (!repo->url) {
1774                        char *path = strstr(arg, "//");
1775                        str_end_url_with_slash(arg, &repo->url);
1776                        repo->path_len = strlen(repo->url);
1777                        if (path) {
1778                                repo->path = strchr(path+2, '/');
1779                                if (repo->path)
1780                                        repo->path_len = strlen(repo->path);
1781                        }
1782                        continue;
1783                }
1784                refspec = argv;
1785                nr_refspec = argc - i;
1786                break;
1787        }
1788
1789#ifndef USE_CURL_MULTI
1790        die("git-push is not available for http/https repository when not compiled with USE_CURL_MULTI");
1791#endif
1792
1793        if (!repo->url)
1794                usage(http_push_usage);
1795
1796        if (delete_branch && nr_refspec != 1)
1797                die("You must specify only one branch name when deleting a remote branch");
1798
1799        setup_git_directory();
1800
1801        memset(remote_dir_exists, -1, 256);
1802
1803        http_init(NULL, repo->url, 1);
1804
1805#ifdef USE_CURL_MULTI
1806        is_running_queue = 0;
1807#endif
1808
1809        /* Verify DAV compliance/lock support */
1810        if (!locking_available()) {
1811                rc = 1;
1812                goto cleanup;
1813        }
1814
1815        sigchain_push_common(remove_locks_on_signal);
1816
1817        /* Check whether the remote has server info files */
1818        repo->can_update_info_refs = 0;
1819        repo->has_info_refs = remote_exists("info/refs");
1820        repo->has_info_packs = remote_exists("objects/info/packs");
1821        if (repo->has_info_refs) {
1822                info_ref_lock = lock_remote("info/refs", LOCK_TIME);
1823                if (info_ref_lock)
1824                        repo->can_update_info_refs = 1;
1825                else {
1826                        error("cannot lock existing info/refs");
1827                        rc = 1;
1828                        goto cleanup;
1829                }
1830        }
1831        if (repo->has_info_packs)
1832                fetch_indices();
1833
1834        /* Get a list of all local and remote heads to validate refspecs */
1835        local_refs = get_local_heads();
1836        fprintf(stderr, "Fetching remote heads...\n");
1837        get_dav_remote_heads();
1838        run_request_queue();
1839
1840        /* Remove a remote branch if -d or -D was specified */
1841        if (delete_branch) {
1842                if (delete_remote_branch(refspec[0], force_delete) == -1) {
1843                        fprintf(stderr, "Unable to delete remote branch %s\n",
1844                                refspec[0]);
1845                        if (helper_status)
1846                                printf("error %s cannot remove\n", refspec[0]);
1847                }
1848                goto cleanup;
1849        }
1850
1851        /* match them up */
1852        if (match_push_refs(local_refs, &remote_refs,
1853                            nr_refspec, (const char **) refspec, push_all)) {
1854                rc = -1;
1855                goto cleanup;
1856        }
1857        if (!remote_refs) {
1858                fprintf(stderr, "No refs in common and none specified; doing nothing.\n");
1859                if (helper_status)
1860                        printf("error null no match\n");
1861                rc = 0;
1862                goto cleanup;
1863        }
1864
1865        new_refs = 0;
1866        for (ref = remote_refs; ref; ref = ref->next) {
1867                char old_hex[60], *new_hex;
1868                const char *commit_argv[5];
1869                int commit_argc;
1870                char *new_sha1_hex, *old_sha1_hex;
1871
1872                if (!ref->peer_ref)
1873                        continue;
1874
1875                if (is_null_sha1(ref->peer_ref->new_sha1)) {
1876                        if (delete_remote_branch(ref->name, 1) == -1) {
1877                                error("Could not remove %s", ref->name);
1878                                if (helper_status)
1879                                        printf("error %s cannot remove\n", ref->name);
1880                                rc = -4;
1881                        }
1882                        else if (helper_status)
1883                                printf("ok %s\n", ref->name);
1884                        new_refs++;
1885                        continue;
1886                }
1887
1888                if (!hashcmp(ref->old_sha1, ref->peer_ref->new_sha1)) {
1889                        if (push_verbosely)
1890                                fprintf(stderr, "'%s': up-to-date\n", ref->name);
1891                        if (helper_status)
1892                                printf("ok %s up to date\n", ref->name);
1893                        continue;
1894                }
1895
1896                if (!force_all &&
1897                    !is_null_sha1(ref->old_sha1) &&
1898                    !ref->force) {
1899                        if (!has_sha1_file(ref->old_sha1) ||
1900                            !ref_newer(ref->peer_ref->new_sha1,
1901                                       ref->old_sha1)) {
1902                                /*
1903                                 * We do not have the remote ref, or
1904                                 * we know that the remote ref is not
1905                                 * an ancestor of what we are trying to
1906                                 * push.  Either way this can be losing
1907                                 * commits at the remote end and likely
1908                                 * we were not up to date to begin with.
1909                                 */
1910                                error("remote '%s' is not an ancestor of\n"
1911                                      "local '%s'.\n"
1912                                      "Maybe you are not up-to-date and "
1913                                      "need to pull first?",
1914                                      ref->name,
1915                                      ref->peer_ref->name);
1916                                if (helper_status)
1917                                        printf("error %s non-fast forward\n", ref->name);
1918                                rc = -2;
1919                                continue;
1920                        }
1921                }
1922                hashcpy(ref->new_sha1, ref->peer_ref->new_sha1);
1923                new_refs++;
1924                strcpy(old_hex, sha1_to_hex(ref->old_sha1));
1925                new_hex = sha1_to_hex(ref->new_sha1);
1926
1927                fprintf(stderr, "updating '%s'", ref->name);
1928                if (strcmp(ref->name, ref->peer_ref->name))
1929                        fprintf(stderr, " using '%s'", ref->peer_ref->name);
1930                fprintf(stderr, "\n  from %s\n  to   %s\n", old_hex, new_hex);
1931                if (dry_run) {
1932                        if (helper_status)
1933                                printf("ok %s\n", ref->name);
1934                        continue;
1935                }
1936
1937                /* Lock remote branch ref */
1938                ref_lock = lock_remote(ref->name, LOCK_TIME);
1939                if (ref_lock == NULL) {
1940                        fprintf(stderr, "Unable to lock remote branch %s\n",
1941                                ref->name);
1942                        if (helper_status)
1943                                printf("error %s lock error\n", ref->name);
1944                        rc = 1;
1945                        continue;
1946                }
1947
1948                /* Set up revision info for this refspec */
1949                commit_argc = 3;
1950                new_sha1_hex = xstrdup(sha1_to_hex(ref->new_sha1));
1951                old_sha1_hex = NULL;
1952                commit_argv[1] = "--objects";
1953                commit_argv[2] = new_sha1_hex;
1954                if (!push_all && !is_null_sha1(ref->old_sha1)) {
1955                        old_sha1_hex = xmalloc(42);
1956                        sprintf(old_sha1_hex, "^%s",
1957                                sha1_to_hex(ref->old_sha1));
1958                        commit_argv[3] = old_sha1_hex;
1959                        commit_argc++;
1960                }
1961                commit_argv[commit_argc] = NULL;
1962                init_revisions(&revs, setup_git_directory());
1963                setup_revisions(commit_argc, commit_argv, &revs, NULL);
1964                revs.edge_hint = 0; /* just in case */
1965                free(new_sha1_hex);
1966                if (old_sha1_hex) {
1967                        free(old_sha1_hex);
1968                        commit_argv[1] = NULL;
1969                }
1970
1971                /* Generate a list of objects that need to be pushed */
1972                pushing = 0;
1973                if (prepare_revision_walk(&revs))
1974                        die("revision walk setup failed");
1975                mark_edges_uninteresting(revs.commits, &revs, NULL);
1976                objects_to_send = get_delta(&revs, ref_lock);
1977                finish_all_active_slots();
1978
1979                /* Push missing objects to remote, this would be a
1980                   convenient time to pack them first if appropriate. */
1981                pushing = 1;
1982                if (objects_to_send)
1983                        fprintf(stderr, "    sending %d objects\n",
1984                                objects_to_send);
1985
1986                run_request_queue();
1987
1988                /* Update the remote branch if all went well */
1989                if (aborted || !update_remote(ref->new_sha1, ref_lock))
1990                        rc = 1;
1991
1992                if (!rc)
1993                        fprintf(stderr, "    done\n");
1994                if (helper_status)
1995                        printf("%s %s\n", !rc ? "ok" : "error", ref->name);
1996                unlock_remote(ref_lock);
1997                check_locks();
1998        }
1999
2000        /* Update remote server info if appropriate */
2001        if (repo->has_info_refs && new_refs) {
2002                if (info_ref_lock && repo->can_update_info_refs) {
2003                        fprintf(stderr, "Updating remote server info\n");
2004                        if (!dry_run)
2005                                update_remote_info_refs(info_ref_lock);
2006                } else {
2007                        fprintf(stderr, "Unable to update server info\n");
2008                }
2009        }
2010
2011 cleanup:
2012        if (info_ref_lock)
2013                unlock_remote(info_ref_lock);
2014        free(repo);
2015
2016        http_cleanup();
2017
2018        request = request_queue_head;
2019        while (request != NULL) {
2020                next_request = request->next;
2021                release_request(request);
2022                request = next_request;
2023        }
2024
2025        return rc;
2026}