http-push.con commit Merge branch 'jc/push-cert' into maint (631f6f1)
   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#ifdef EXPAT_NEEDS_XMLPARSE_H
  15#include <xmlparse.h>
  16#else
  17#include <expat.h>
  18#endif
  19
  20static const char http_push_usage[] =
  21"git http-push [--all] [--dry-run] [--force] [--verbose] <remote> [<head>...]\n";
  22
  23#ifndef XML_STATUS_OK
  24enum XML_Status {
  25  XML_STATUS_OK = 1,
  26  XML_STATUS_ERROR = 0
  27};
  28#define XML_STATUS_OK    1
  29#define XML_STATUS_ERROR 0
  30#endif
  31
  32#define PREV_BUF_SIZE 4096
  33
  34/* DAV methods */
  35#define DAV_LOCK "LOCK"
  36#define DAV_MKCOL "MKCOL"
  37#define DAV_MOVE "MOVE"
  38#define DAV_PROPFIND "PROPFIND"
  39#define DAV_PUT "PUT"
  40#define DAV_UNLOCK "UNLOCK"
  41#define DAV_DELETE "DELETE"
  42
  43/* DAV lock flags */
  44#define DAV_PROP_LOCKWR (1u << 0)
  45#define DAV_PROP_LOCKEX (1u << 1)
  46#define DAV_LOCK_OK (1u << 2)
  47
  48/* DAV XML properties */
  49#define DAV_CTX_LOCKENTRY ".multistatus.response.propstat.prop.supportedlock.lockentry"
  50#define DAV_CTX_LOCKTYPE_WRITE ".multistatus.response.propstat.prop.supportedlock.lockentry.locktype.write"
  51#define DAV_CTX_LOCKTYPE_EXCLUSIVE ".multistatus.response.propstat.prop.supportedlock.lockentry.lockscope.exclusive"
  52#define DAV_ACTIVELOCK_OWNER ".prop.lockdiscovery.activelock.owner.href"
  53#define DAV_ACTIVELOCK_TIMEOUT ".prop.lockdiscovery.activelock.timeout"
  54#define DAV_ACTIVELOCK_TOKEN ".prop.lockdiscovery.activelock.locktoken.href"
  55#define DAV_PROPFIND_RESP ".multistatus.response"
  56#define DAV_PROPFIND_NAME ".multistatus.response.href"
  57#define DAV_PROPFIND_COLLECTION ".multistatus.response.propstat.prop.resourcetype.collection"
  58
  59/* DAV request body templates */
  60#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>"
  61#define PROPFIND_ALL_REQUEST "<?xml version=\"1.0\" encoding=\"utf-8\" ?>\n<D:propfind xmlns:D=\"DAV:\">\n<D:allprop/>\n</D:propfind>"
  62#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>"
  63
  64#define LOCK_TIME 600
  65#define LOCK_REFRESH 30
  66
  67/* Remember to update object flag allocation in object.h */
  68#define LOCAL    (1u<<16)
  69#define REMOTE   (1u<<17)
  70#define FETCHING (1u<<18)
  71#define PUSHING  (1u<<19)
  72
  73/* We allow "recursive" symbolic refs. Only within reason, though */
  74#define MAXDEPTH 5
  75
  76static int pushing;
  77static int aborted;
  78static signed char remote_dir_exists[256];
  79
  80static int push_verbosely;
  81static int push_all = MATCH_REFS_NONE;
  82static int force_all;
  83static int dry_run;
  84static int helper_status;
  85
  86static struct object_list *objects;
  87
  88struct repo {
  89        char *url;
  90        char *path;
  91        int path_len;
  92        int has_info_refs;
  93        int can_update_info_refs;
  94        int has_info_packs;
  95        struct packed_git *packs;
  96        struct remote_lock *locks;
  97};
  98
  99static struct repo *repo;
 100
 101enum transfer_state {
 102        NEED_FETCH,
 103        RUN_FETCH_LOOSE,
 104        RUN_FETCH_PACKED,
 105        NEED_PUSH,
 106        RUN_MKCOL,
 107        RUN_PUT,
 108        RUN_MOVE,
 109        ABORTED,
 110        COMPLETE
 111};
 112
 113struct transfer_request {
 114        struct object *obj;
 115        char *url;
 116        char *dest;
 117        struct remote_lock *lock;
 118        struct curl_slist *headers;
 119        struct buffer buffer;
 120        enum transfer_state state;
 121        CURLcode curl_result;
 122        char errorstr[CURL_ERROR_SIZE];
 123        long http_code;
 124        void *userData;
 125        struct active_request_slot *slot;
 126        struct transfer_request *next;
 127};
 128
 129static struct transfer_request *request_queue_head;
 130
 131struct xml_ctx {
 132        char *name;
 133        int len;
 134        char *cdata;
 135        void (*userFunc)(struct xml_ctx *ctx, int tag_closed);
 136        void *userData;
 137};
 138
 139struct remote_lock {
 140        char *url;
 141        char *owner;
 142        char *token;
 143        char tmpfile_suffix[41];
 144        time_t start_time;
 145        long timeout;
 146        int refreshing;
 147        struct remote_lock *next;
 148};
 149
 150/* Flags that control remote_ls processing */
 151#define PROCESS_FILES (1u << 0)
 152#define PROCESS_DIRS  (1u << 1)
 153#define RECURSIVE     (1u << 2)
 154
 155/* Flags that remote_ls passes to callback functions */
 156#define IS_DIR (1u << 0)
 157
 158struct remote_ls_ctx {
 159        char *path;
 160        void (*userFunc)(struct remote_ls_ctx *ls);
 161        void *userData;
 162        int flags;
 163        char *dentry_name;
 164        int dentry_flags;
 165        struct remote_ls_ctx *parent;
 166};
 167
 168/* get_dav_token_headers options */
 169enum dav_header_flag {
 170        DAV_HEADER_IF = (1u << 0),
 171        DAV_HEADER_LOCK = (1u << 1),
 172        DAV_HEADER_TIMEOUT = (1u << 2)
 173};
 174
 175static char *xml_entities(const char *s)
 176{
 177        struct strbuf buf = STRBUF_INIT;
 178        strbuf_addstr_xml_quoted(&buf, s);
 179        return strbuf_detach(&buf, NULL);
 180}
 181
 182static void curl_setup_http_get(CURL *curl, const char *url,
 183                const char *custom_req)
 184{
 185        curl_easy_setopt(curl, CURLOPT_HTTPGET, 1);
 186        curl_easy_setopt(curl, CURLOPT_URL, url);
 187        curl_easy_setopt(curl, CURLOPT_CUSTOMREQUEST, custom_req);
 188        curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, fwrite_null);
 189}
 190
 191static void curl_setup_http(CURL *curl, const char *url,
 192                const char *custom_req, struct buffer *buffer,
 193                curl_write_callback write_fn)
 194{
 195        curl_easy_setopt(curl, CURLOPT_PUT, 1);
 196        curl_easy_setopt(curl, CURLOPT_URL, url);
 197        curl_easy_setopt(curl, CURLOPT_INFILE, buffer);
 198        curl_easy_setopt(curl, CURLOPT_INFILESIZE, buffer->buf.len);
 199        curl_easy_setopt(curl, CURLOPT_READFUNCTION, fread_buffer);
 200#ifndef NO_CURL_IOCTL
 201        curl_easy_setopt(curl, CURLOPT_IOCTLFUNCTION, ioctl_buffer);
 202        curl_easy_setopt(curl, CURLOPT_IOCTLDATA, buffer);
 203#endif
 204        curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, write_fn);
 205        curl_easy_setopt(curl, CURLOPT_NOBODY, 0);
 206        curl_easy_setopt(curl, CURLOPT_CUSTOMREQUEST, custom_req);
 207        curl_easy_setopt(curl, CURLOPT_UPLOAD, 1);
 208}
 209
 210static struct curl_slist *get_dav_token_headers(struct remote_lock *lock, enum dav_header_flag options)
 211{
 212        struct strbuf buf = STRBUF_INIT;
 213        struct curl_slist *dav_headers = NULL;
 214
 215        if (options & DAV_HEADER_IF) {
 216                strbuf_addf(&buf, "If: (<%s>)", lock->token);
 217                dav_headers = curl_slist_append(dav_headers, buf.buf);
 218                strbuf_reset(&buf);
 219        }
 220        if (options & DAV_HEADER_LOCK) {
 221                strbuf_addf(&buf, "Lock-Token: <%s>", lock->token);
 222                dav_headers = curl_slist_append(dav_headers, buf.buf);
 223                strbuf_reset(&buf);
 224        }
 225        if (options & DAV_HEADER_TIMEOUT) {
 226                strbuf_addf(&buf, "Timeout: Second-%ld", lock->timeout);
 227                dav_headers = curl_slist_append(dav_headers, buf.buf);
 228                strbuf_reset(&buf);
 229        }
 230        strbuf_release(&buf);
 231
 232        return dav_headers;
 233}
 234
 235static void finish_request(struct transfer_request *request);
 236static void release_request(struct transfer_request *request);
 237
 238static void process_response(void *callback_data)
 239{
 240        struct transfer_request *request =
 241                (struct transfer_request *)callback_data;
 242
 243        finish_request(request);
 244}
 245
 246#ifdef USE_CURL_MULTI
 247
 248static void start_fetch_loose(struct transfer_request *request)
 249{
 250        struct active_request_slot *slot;
 251        struct http_object_request *obj_req;
 252
 253        obj_req = new_http_object_request(repo->url, request->obj->sha1);
 254        if (obj_req == NULL) {
 255                request->state = ABORTED;
 256                return;
 257        }
 258
 259        slot = obj_req->slot;
 260        slot->callback_func = process_response;
 261        slot->callback_data = request;
 262        request->slot = slot;
 263        request->userData = obj_req;
 264
 265        /* Try to get the request started, abort the request on error */
 266        request->state = RUN_FETCH_LOOSE;
 267        if (!start_active_slot(slot)) {
 268                fprintf(stderr, "Unable to start GET request\n");
 269                repo->can_update_info_refs = 0;
 270                release_http_object_request(obj_req);
 271                release_request(request);
 272        }
 273}
 274
 275static void start_mkcol(struct transfer_request *request)
 276{
 277        char *hex = sha1_to_hex(request->obj->sha1);
 278        struct active_request_slot *slot;
 279
 280        request->url = get_remote_object_url(repo->url, hex, 1);
 281
 282        slot = get_active_slot();
 283        slot->callback_func = process_response;
 284        slot->callback_data = request;
 285        curl_setup_http_get(slot->curl, request->url, DAV_MKCOL);
 286        curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, request->errorstr);
 287
 288        if (start_active_slot(slot)) {
 289                request->slot = slot;
 290                request->state = RUN_MKCOL;
 291        } else {
 292                request->state = ABORTED;
 293                free(request->url);
 294                request->url = NULL;
 295        }
 296}
 297#endif
 298
 299static void start_fetch_packed(struct transfer_request *request)
 300{
 301        struct packed_git *target;
 302
 303        struct transfer_request *check_request = request_queue_head;
 304        struct http_pack_request *preq;
 305
 306        target = find_sha1_pack(request->obj->sha1, repo->packs);
 307        if (!target) {
 308                fprintf(stderr, "Unable to fetch %s, will not be able to update server info refs\n", sha1_to_hex(request->obj->sha1));
 309                repo->can_update_info_refs = 0;
 310                release_request(request);
 311                return;
 312        }
 313
 314        fprintf(stderr, "Fetching pack %s\n", sha1_to_hex(target->sha1));
 315        fprintf(stderr, " which contains %s\n", sha1_to_hex(request->obj->sha1));
 316
 317        preq = new_http_pack_request(target, repo->url);
 318        if (preq == NULL) {
 319                release_http_pack_request(preq);
 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
 351static void start_put(struct transfer_request *request)
 352{
 353        char *hex = sha1_to_hex(request->obj->sha1);
 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->sha1, &type, &len);
 365        hdrlen = sprintf(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
 417static void start_move(struct transfer_request *request)
 418{
 419        struct active_request_slot *slot;
 420        struct curl_slist *dav_headers = NULL;
 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
 440static 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
 473static 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
 495static 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
 512static 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->sha1[0]] = 1;
 537                        start_put(request);
 538                } else {
 539                        fprintf(stderr, "MKCOL %s failed, aborting (%d/%ld)\n",
 540                                sha1_to_hex(request->obj->sha1),
 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                                sha1_to_hex(request->obj->sha1),
 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                                        sha1_to_hex(request->obj->sha1));
 560                        request->obj->flags |= REMOTE;
 561                        release_request(request);
 562                } else {
 563                        fprintf(stderr, "MOVE %s failed, aborting (%d/%ld)\n",
 564                                sha1_to_hex(request->obj->sha1),
 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
 604static int is_running_queue;
 605static 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->sha1[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
 629static void get_remote_object_list(unsigned char parent);
 630
 631static 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->sha1[0]] == -1)
 642                get_remote_object_list(obj->sha1[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
 662static 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->sha1[0]] == -1)
 675                get_remote_object_list(obj->sha1[0]);
 676        if (obj->flags & (REMOTE | PUSHING))
 677                return 0;
 678        target = find_sha1_pack(obj->sha1, 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
 702static 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
 721static 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
 738static 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
 757static 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
 783static void one_remote_ref(const char *refname);
 784
 785static void
 786xml_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 new_len;
 791
 792        if (c == NULL)
 793                c = name;
 794        else
 795                c++;
 796
 797        new_len = strlen(ctx->name) + strlen(c) + 2;
 798
 799        if (new_len > ctx->len) {
 800                ctx->name = xrealloc(ctx->name, new_len);
 801                ctx->len = new_len;
 802        }
 803        strcat(ctx->name, ".");
 804        strcat(ctx->name, c);
 805
 806        free(ctx->cdata);
 807        ctx->cdata = NULL;
 808
 809        ctx->userFunc(ctx, 0);
 810}
 811
 812static void
 813xml_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
 830static void
 831xml_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
 838static 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 = NULL;
 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        sprintf(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
 947static 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
 992static 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
1004static void remove_locks_on_signal(int signo)
1005{
1006        remove_locks();
1007        sigchain_pop(signo);
1008        raise(signo);
1009}
1010
1011static 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 */
1016static 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
1031static 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
1049static 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
1060static 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 */
1120static 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 = NULL;
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
1188static 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
1201static 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 = NULL;
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
1270static 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
1279static struct object_list **process_blob(struct blob *blob,
1280                                         struct object_list **p,
1281                                         struct name_path *path,
1282                                         const char *name)
1283{
1284        struct object *obj = &blob->object;
1285
1286        obj->flags |= LOCAL;
1287
1288        if (obj->flags & (UNINTERESTING | SEEN))
1289                return p;
1290
1291        obj->flags |= SEEN;
1292        return add_one_object(obj, p);
1293}
1294
1295static struct object_list **process_tree(struct tree *tree,
1296                                         struct object_list **p,
1297                                         struct name_path *path,
1298                                         const char *name)
1299{
1300        struct object *obj = &tree->object;
1301        struct tree_desc desc;
1302        struct name_entry entry;
1303        struct name_path me;
1304
1305        obj->flags |= LOCAL;
1306
1307        if (obj->flags & (UNINTERESTING | SEEN))
1308                return p;
1309        if (parse_tree(tree) < 0)
1310                die("bad tree object %s", sha1_to_hex(obj->sha1));
1311
1312        obj->flags |= SEEN;
1313        name = xstrdup(name);
1314        p = add_one_object(obj, p);
1315        me.up = path;
1316        me.elem = name;
1317        me.elem_len = strlen(name);
1318
1319        init_tree_desc(&desc, tree->buffer, tree->size);
1320
1321        while (tree_entry(&desc, &entry))
1322                switch (object_type(entry.mode)) {
1323                case OBJ_TREE:
1324                        p = process_tree(lookup_tree(entry.sha1), p, &me, name);
1325                        break;
1326                case OBJ_BLOB:
1327                        p = process_blob(lookup_blob(entry.sha1), p, &me, name);
1328                        break;
1329                default:
1330                        /* Subproject commit - not in this repository */
1331                        break;
1332                }
1333
1334        free_tree_buffer(tree);
1335        return p;
1336}
1337
1338static int get_delta(struct rev_info *revs, struct remote_lock *lock)
1339{
1340        int i;
1341        struct commit *commit;
1342        struct object_list **p = &objects;
1343        int count = 0;
1344
1345        while ((commit = get_revision(revs)) != NULL) {
1346                p = process_tree(commit->tree, p, NULL, "");
1347                commit->object.flags |= LOCAL;
1348                if (!(commit->object.flags & UNINTERESTING))
1349                        count += add_send_request(&commit->object, lock);
1350        }
1351
1352        for (i = 0; i < revs->pending.nr; i++) {
1353                struct object_array_entry *entry = revs->pending.objects + i;
1354                struct object *obj = entry->item;
1355                const char *name = entry->name;
1356
1357                if (obj->flags & (UNINTERESTING | SEEN))
1358                        continue;
1359                if (obj->type == OBJ_TAG) {
1360                        obj->flags |= SEEN;
1361                        p = add_one_object(obj, p);
1362                        continue;
1363                }
1364                if (obj->type == OBJ_TREE) {
1365                        p = process_tree((struct tree *)obj, p, NULL, name);
1366                        continue;
1367                }
1368                if (obj->type == OBJ_BLOB) {
1369                        p = process_blob((struct blob *)obj, p, NULL, name);
1370                        continue;
1371                }
1372                die("unknown pending object %s (%s)", sha1_to_hex(obj->sha1), name);
1373        }
1374
1375        while (objects) {
1376                if (!(objects->item->flags & UNINTERESTING))
1377                        count += add_send_request(objects->item, lock);
1378                objects = objects->next;
1379        }
1380
1381        return count;
1382}
1383
1384static int update_remote(unsigned char *sha1, struct remote_lock *lock)
1385{
1386        struct active_request_slot *slot;
1387        struct slot_results results;
1388        struct buffer out_buffer = { STRBUF_INIT, 0 };
1389        struct curl_slist *dav_headers;
1390
1391        dav_headers = get_dav_token_headers(lock, DAV_HEADER_IF);
1392
1393        strbuf_addf(&out_buffer.buf, "%s\n", sha1_to_hex(sha1));
1394
1395        slot = get_active_slot();
1396        slot->results = &results;
1397        curl_setup_http(slot->curl, lock->url, DAV_PUT,
1398                        &out_buffer, fwrite_null);
1399        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
1400
1401        if (start_active_slot(slot)) {
1402                run_active_slot(slot);
1403                strbuf_release(&out_buffer.buf);
1404                if (results.curl_result != CURLE_OK) {
1405                        fprintf(stderr,
1406                                "PUT error: curl result=%d, HTTP code=%ld\n",
1407                                results.curl_result, results.http_code);
1408                        /* We should attempt recovery? */
1409                        return 0;
1410                }
1411        } else {
1412                strbuf_release(&out_buffer.buf);
1413                fprintf(stderr, "Unable to start PUT request\n");
1414                return 0;
1415        }
1416
1417        return 1;
1418}
1419
1420static struct ref *remote_refs;
1421
1422static void one_remote_ref(const char *refname)
1423{
1424        struct ref *ref;
1425        struct object *obj;
1426
1427        ref = alloc_ref(refname);
1428
1429        if (http_fetch_ref(repo->url, ref) != 0) {
1430                fprintf(stderr,
1431                        "Unable to fetch ref %s from %s\n",
1432                        refname, repo->url);
1433                free(ref);
1434                return;
1435        }
1436
1437        /*
1438         * Fetch a copy of the object if it doesn't exist locally - it
1439         * may be required for updating server info later.
1440         */
1441        if (repo->can_update_info_refs && !has_sha1_file(ref->old_sha1)) {
1442                obj = lookup_unknown_object(ref->old_sha1);
1443                if (obj) {
1444                        fprintf(stderr, "  fetch %s for %s\n",
1445                                sha1_to_hex(ref->old_sha1), refname);
1446                        add_fetch_request(obj);
1447                }
1448        }
1449
1450        ref->next = remote_refs;
1451        remote_refs = ref;
1452}
1453
1454static void get_dav_remote_heads(void)
1455{
1456        remote_ls("refs/", (PROCESS_FILES | PROCESS_DIRS | RECURSIVE), process_ls_ref, NULL);
1457}
1458
1459static void add_remote_info_ref(struct remote_ls_ctx *ls)
1460{
1461        struct strbuf *buf = (struct strbuf *)ls->userData;
1462        struct object *o;
1463        int len;
1464        char *ref_info;
1465        struct ref *ref;
1466
1467        ref = alloc_ref(ls->dentry_name);
1468
1469        if (http_fetch_ref(repo->url, ref) != 0) {
1470                fprintf(stderr,
1471                        "Unable to fetch ref %s from %s\n",
1472                        ls->dentry_name, repo->url);
1473                aborted = 1;
1474                free(ref);
1475                return;
1476        }
1477
1478        o = parse_object(ref->old_sha1);
1479        if (!o) {
1480                fprintf(stderr,
1481                        "Unable to parse object %s for remote ref %s\n",
1482                        sha1_to_hex(ref->old_sha1), ls->dentry_name);
1483                aborted = 1;
1484                free(ref);
1485                return;
1486        }
1487
1488        len = strlen(ls->dentry_name) + 42;
1489        ref_info = xcalloc(len + 1, 1);
1490        sprintf(ref_info, "%s   %s\n",
1491                sha1_to_hex(ref->old_sha1), ls->dentry_name);
1492        fwrite_buffer(ref_info, 1, len, buf);
1493        free(ref_info);
1494
1495        if (o->type == OBJ_TAG) {
1496                o = deref_tag(o, ls->dentry_name, 0);
1497                if (o) {
1498                        len = strlen(ls->dentry_name) + 45;
1499                        ref_info = xcalloc(len + 1, 1);
1500                        sprintf(ref_info, "%s   %s^{}\n",
1501                                sha1_to_hex(o->sha1), ls->dentry_name);
1502                        fwrite_buffer(ref_info, 1, len, buf);
1503                        free(ref_info);
1504                }
1505        }
1506        free(ref);
1507}
1508
1509static void update_remote_info_refs(struct remote_lock *lock)
1510{
1511        struct buffer buffer = { STRBUF_INIT, 0 };
1512        struct active_request_slot *slot;
1513        struct slot_results results;
1514        struct curl_slist *dav_headers;
1515
1516        remote_ls("refs/", (PROCESS_FILES | RECURSIVE),
1517                  add_remote_info_ref, &buffer.buf);
1518        if (!aborted) {
1519                dav_headers = get_dav_token_headers(lock, DAV_HEADER_IF);
1520
1521                slot = get_active_slot();
1522                slot->results = &results;
1523                curl_setup_http(slot->curl, lock->url, DAV_PUT,
1524                                &buffer, fwrite_null);
1525                curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
1526
1527                if (start_active_slot(slot)) {
1528                        run_active_slot(slot);
1529                        if (results.curl_result != CURLE_OK) {
1530                                fprintf(stderr,
1531                                        "PUT error: curl result=%d, HTTP code=%ld\n",
1532                                        results.curl_result, results.http_code);
1533                        }
1534                }
1535        }
1536        strbuf_release(&buffer.buf);
1537}
1538
1539static int remote_exists(const char *path)
1540{
1541        char *url = xstrfmt("%s%s", repo->url, path);
1542        int ret;
1543
1544
1545        switch (http_get_strbuf(url, NULL, NULL)) {
1546        case HTTP_OK:
1547                ret = 1;
1548                break;
1549        case HTTP_MISSING_TARGET:
1550                ret = 0;
1551                break;
1552        case HTTP_ERROR:
1553                error("unable to access '%s': %s", url, curl_errorstr);
1554        default:
1555                ret = -1;
1556        }
1557        free(url);
1558        return ret;
1559}
1560
1561static void fetch_symref(const char *path, char **symref, unsigned char *sha1)
1562{
1563        char *url = xstrfmt("%s%s", repo->url, path);
1564        struct strbuf buffer = STRBUF_INIT;
1565        const char *name;
1566
1567        if (http_get_strbuf(url, &buffer, NULL) != HTTP_OK)
1568                die("Couldn't get %s for remote symref\n%s", url,
1569                    curl_errorstr);
1570        free(url);
1571
1572        free(*symref);
1573        *symref = NULL;
1574        hashclr(sha1);
1575
1576        if (buffer.len == 0)
1577                return;
1578
1579        /* Cut off trailing newline. */
1580        strbuf_rtrim(&buffer);
1581
1582        /* If it's a symref, set the refname; otherwise try for a sha1 */
1583        if (skip_prefix(buffer.buf, "ref: ", &name)) {
1584                *symref = xmemdupz(name, buffer.len - (name - buffer.buf));
1585        } else {
1586                get_sha1_hex(buffer.buf, sha1);
1587        }
1588
1589        strbuf_release(&buffer);
1590}
1591
1592static int verify_merge_base(unsigned char *head_sha1, struct ref *remote)
1593{
1594        struct commit *head = lookup_commit_or_die(head_sha1, "HEAD");
1595        struct commit *branch = lookup_commit_or_die(remote->old_sha1, remote->name);
1596
1597        return in_merge_bases(branch, head);
1598}
1599
1600static int delete_remote_branch(const char *pattern, int force)
1601{
1602        struct ref *refs = remote_refs;
1603        struct ref *remote_ref = NULL;
1604        unsigned char head_sha1[20];
1605        char *symref = NULL;
1606        int match;
1607        int patlen = strlen(pattern);
1608        int i;
1609        struct active_request_slot *slot;
1610        struct slot_results results;
1611        char *url;
1612
1613        /* Find the remote branch(es) matching the specified branch name */
1614        for (match = 0; refs; refs = refs->next) {
1615                char *name = refs->name;
1616                int namelen = strlen(name);
1617                if (namelen < patlen ||
1618                    memcmp(name + namelen - patlen, pattern, patlen))
1619                        continue;
1620                if (namelen != patlen && name[namelen - patlen - 1] != '/')
1621                        continue;
1622                match++;
1623                remote_ref = refs;
1624        }
1625        if (match == 0)
1626                return error("No remote branch matches %s", pattern);
1627        if (match != 1)
1628                return error("More than one remote branch matches %s",
1629                             pattern);
1630
1631        /*
1632         * Remote HEAD must be a symref (not exactly foolproof; a remote
1633         * symlink to a symref will look like a symref)
1634         */
1635        fetch_symref("HEAD", &symref, head_sha1);
1636        if (!symref)
1637                return error("Remote HEAD is not a symref");
1638
1639        /* Remote branch must not be the remote HEAD */
1640        for (i = 0; symref && i < MAXDEPTH; i++) {
1641                if (!strcmp(remote_ref->name, symref))
1642                        return error("Remote branch %s is the current HEAD",
1643                                     remote_ref->name);
1644                fetch_symref(symref, &symref, head_sha1);
1645        }
1646
1647        /* Run extra sanity checks if delete is not forced */
1648        if (!force) {
1649                /* Remote HEAD must resolve to a known object */
1650                if (symref)
1651                        return error("Remote HEAD symrefs too deep");
1652                if (is_null_sha1(head_sha1))
1653                        return error("Unable to resolve remote HEAD");
1654                if (!has_sha1_file(head_sha1))
1655                        return error("Remote HEAD resolves to object %s\nwhich does not exist locally, perhaps you need to fetch?", sha1_to_hex(head_sha1));
1656
1657                /* Remote branch must resolve to a known object */
1658                if (is_null_sha1(remote_ref->old_sha1))
1659                        return error("Unable to resolve remote branch %s",
1660                                     remote_ref->name);
1661                if (!has_sha1_file(remote_ref->old_sha1))
1662                        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));
1663
1664                /* Remote branch must be an ancestor of remote HEAD */
1665                if (!verify_merge_base(head_sha1, remote_ref)) {
1666                        return error("The branch '%s' is not an ancestor "
1667                                     "of your current HEAD.\n"
1668                                     "If you are sure you want to delete it,"
1669                                     " run:\n\t'git http-push -D %s %s'",
1670                                     remote_ref->name, repo->url, pattern);
1671                }
1672        }
1673
1674        /* Send delete request */
1675        fprintf(stderr, "Removing remote branch '%s'\n", remote_ref->name);
1676        if (dry_run)
1677                return 0;
1678        url = xstrfmt("%s%s", repo->url, remote_ref->name);
1679        slot = get_active_slot();
1680        slot->results = &results;
1681        curl_setup_http_get(slot->curl, url, DAV_DELETE);
1682        if (start_active_slot(slot)) {
1683                run_active_slot(slot);
1684                free(url);
1685                if (results.curl_result != CURLE_OK)
1686                        return error("DELETE request failed (%d/%ld)",
1687                                     results.curl_result, results.http_code);
1688        } else {
1689                free(url);
1690                return error("Unable to start DELETE request");
1691        }
1692
1693        return 0;
1694}
1695
1696static void run_request_queue(void)
1697{
1698#ifdef USE_CURL_MULTI
1699        is_running_queue = 1;
1700        fill_active_slots();
1701        add_fill_function(NULL, fill_active_slot);
1702#endif
1703        do {
1704                finish_all_active_slots();
1705#ifdef USE_CURL_MULTI
1706                fill_active_slots();
1707#endif
1708        } while (request_queue_head && !aborted);
1709
1710#ifdef USE_CURL_MULTI
1711        is_running_queue = 0;
1712#endif
1713}
1714
1715int main(int argc, char **argv)
1716{
1717        struct transfer_request *request;
1718        struct transfer_request *next_request;
1719        int nr_refspec = 0;
1720        char **refspec = NULL;
1721        struct remote_lock *ref_lock = NULL;
1722        struct remote_lock *info_ref_lock = NULL;
1723        struct rev_info revs;
1724        int delete_branch = 0;
1725        int force_delete = 0;
1726        int objects_to_send;
1727        int rc = 0;
1728        int i;
1729        int new_refs;
1730        struct ref *ref, *local_refs;
1731
1732        git_setup_gettext();
1733
1734        git_extract_argv0_path(argv[0]);
1735
1736        repo = xcalloc(1, sizeof(*repo));
1737
1738        argv++;
1739        for (i = 1; i < argc; i++, argv++) {
1740                char *arg = *argv;
1741
1742                if (*arg == '-') {
1743                        if (!strcmp(arg, "--all")) {
1744                                push_all = MATCH_REFS_ALL;
1745                                continue;
1746                        }
1747                        if (!strcmp(arg, "--force")) {
1748                                force_all = 1;
1749                                continue;
1750                        }
1751                        if (!strcmp(arg, "--dry-run")) {
1752                                dry_run = 1;
1753                                continue;
1754                        }
1755                        if (!strcmp(arg, "--helper-status")) {
1756                                helper_status = 1;
1757                                continue;
1758                        }
1759                        if (!strcmp(arg, "--verbose")) {
1760                                push_verbosely = 1;
1761                                http_is_verbose = 1;
1762                                continue;
1763                        }
1764                        if (!strcmp(arg, "-d")) {
1765                                delete_branch = 1;
1766                                continue;
1767                        }
1768                        if (!strcmp(arg, "-D")) {
1769                                delete_branch = 1;
1770                                force_delete = 1;
1771                                continue;
1772                        }
1773                        if (!strcmp(arg, "-h"))
1774                                usage(http_push_usage);
1775                }
1776                if (!repo->url) {
1777                        char *path = strstr(arg, "//");
1778                        str_end_url_with_slash(arg, &repo->url);
1779                        repo->path_len = strlen(repo->url);
1780                        if (path) {
1781                                repo->path = strchr(path+2, '/');
1782                                if (repo->path)
1783                                        repo->path_len = strlen(repo->path);
1784                        }
1785                        continue;
1786                }
1787                refspec = argv;
1788                nr_refspec = argc - i;
1789                break;
1790        }
1791
1792#ifndef USE_CURL_MULTI
1793        die("git-push is not available for http/https repository when not compiled with USE_CURL_MULTI");
1794#endif
1795
1796        if (!repo->url)
1797                usage(http_push_usage);
1798
1799        if (delete_branch && nr_refspec != 1)
1800                die("You must specify only one branch name when deleting a remote branch");
1801
1802        setup_git_directory();
1803
1804        memset(remote_dir_exists, -1, 256);
1805
1806        http_init(NULL, repo->url, 1);
1807
1808#ifdef USE_CURL_MULTI
1809        is_running_queue = 0;
1810#endif
1811
1812        /* Verify DAV compliance/lock support */
1813        if (!locking_available()) {
1814                rc = 1;
1815                goto cleanup;
1816        }
1817
1818        sigchain_push_common(remove_locks_on_signal);
1819
1820        /* Check whether the remote has server info files */
1821        repo->can_update_info_refs = 0;
1822        repo->has_info_refs = remote_exists("info/refs");
1823        repo->has_info_packs = remote_exists("objects/info/packs");
1824        if (repo->has_info_refs) {
1825                info_ref_lock = lock_remote("info/refs", LOCK_TIME);
1826                if (info_ref_lock)
1827                        repo->can_update_info_refs = 1;
1828                else {
1829                        error("cannot lock existing info/refs");
1830                        rc = 1;
1831                        goto cleanup;
1832                }
1833        }
1834        if (repo->has_info_packs)
1835                fetch_indices();
1836
1837        /* Get a list of all local and remote heads to validate refspecs */
1838        local_refs = get_local_heads();
1839        fprintf(stderr, "Fetching remote heads...\n");
1840        get_dav_remote_heads();
1841        run_request_queue();
1842
1843        /* Remove a remote branch if -d or -D was specified */
1844        if (delete_branch) {
1845                if (delete_remote_branch(refspec[0], force_delete) == -1) {
1846                        fprintf(stderr, "Unable to delete remote branch %s\n",
1847                                refspec[0]);
1848                        if (helper_status)
1849                                printf("error %s cannot remove\n", refspec[0]);
1850                }
1851                goto cleanup;
1852        }
1853
1854        /* match them up */
1855        if (match_push_refs(local_refs, &remote_refs,
1856                            nr_refspec, (const char **) refspec, push_all)) {
1857                rc = -1;
1858                goto cleanup;
1859        }
1860        if (!remote_refs) {
1861                fprintf(stderr, "No refs in common and none specified; doing nothing.\n");
1862                if (helper_status)
1863                        printf("error null no match\n");
1864                rc = 0;
1865                goto cleanup;
1866        }
1867
1868        new_refs = 0;
1869        for (ref = remote_refs; ref; ref = ref->next) {
1870                char old_hex[60], *new_hex;
1871                const char *commit_argv[5];
1872                int commit_argc;
1873                char *new_sha1_hex, *old_sha1_hex;
1874
1875                if (!ref->peer_ref)
1876                        continue;
1877
1878                if (is_null_sha1(ref->peer_ref->new_sha1)) {
1879                        if (delete_remote_branch(ref->name, 1) == -1) {
1880                                error("Could not remove %s", ref->name);
1881                                if (helper_status)
1882                                        printf("error %s cannot remove\n", ref->name);
1883                                rc = -4;
1884                        }
1885                        else if (helper_status)
1886                                printf("ok %s\n", ref->name);
1887                        new_refs++;
1888                        continue;
1889                }
1890
1891                if (!hashcmp(ref->old_sha1, ref->peer_ref->new_sha1)) {
1892                        if (push_verbosely)
1893                                fprintf(stderr, "'%s': up-to-date\n", ref->name);
1894                        if (helper_status)
1895                                printf("ok %s up to date\n", ref->name);
1896                        continue;
1897                }
1898
1899                if (!force_all &&
1900                    !is_null_sha1(ref->old_sha1) &&
1901                    !ref->force) {
1902                        if (!has_sha1_file(ref->old_sha1) ||
1903                            !ref_newer(ref->peer_ref->new_sha1,
1904                                       ref->old_sha1)) {
1905                                /*
1906                                 * We do not have the remote ref, or
1907                                 * we know that the remote ref is not
1908                                 * an ancestor of what we are trying to
1909                                 * push.  Either way this can be losing
1910                                 * commits at the remote end and likely
1911                                 * we were not up to date to begin with.
1912                                 */
1913                                error("remote '%s' is not an ancestor of\n"
1914                                      "local '%s'.\n"
1915                                      "Maybe you are not up-to-date and "
1916                                      "need to pull first?",
1917                                      ref->name,
1918                                      ref->peer_ref->name);
1919                                if (helper_status)
1920                                        printf("error %s non-fast forward\n", ref->name);
1921                                rc = -2;
1922                                continue;
1923                        }
1924                }
1925                hashcpy(ref->new_sha1, ref->peer_ref->new_sha1);
1926                new_refs++;
1927                strcpy(old_hex, sha1_to_hex(ref->old_sha1));
1928                new_hex = sha1_to_hex(ref->new_sha1);
1929
1930                fprintf(stderr, "updating '%s'", ref->name);
1931                if (strcmp(ref->name, ref->peer_ref->name))
1932                        fprintf(stderr, " using '%s'", ref->peer_ref->name);
1933                fprintf(stderr, "\n  from %s\n  to   %s\n", old_hex, new_hex);
1934                if (dry_run) {
1935                        if (helper_status)
1936                                printf("ok %s\n", ref->name);
1937                        continue;
1938                }
1939
1940                /* Lock remote branch ref */
1941                ref_lock = lock_remote(ref->name, LOCK_TIME);
1942                if (ref_lock == NULL) {
1943                        fprintf(stderr, "Unable to lock remote branch %s\n",
1944                                ref->name);
1945                        if (helper_status)
1946                                printf("error %s lock error\n", ref->name);
1947                        rc = 1;
1948                        continue;
1949                }
1950
1951                /* Set up revision info for this refspec */
1952                commit_argc = 3;
1953                new_sha1_hex = xstrdup(sha1_to_hex(ref->new_sha1));
1954                old_sha1_hex = NULL;
1955                commit_argv[1] = "--objects";
1956                commit_argv[2] = new_sha1_hex;
1957                if (!push_all && !is_null_sha1(ref->old_sha1)) {
1958                        old_sha1_hex = xmalloc(42);
1959                        sprintf(old_sha1_hex, "^%s",
1960                                sha1_to_hex(ref->old_sha1));
1961                        commit_argv[3] = old_sha1_hex;
1962                        commit_argc++;
1963                }
1964                commit_argv[commit_argc] = NULL;
1965                init_revisions(&revs, setup_git_directory());
1966                setup_revisions(commit_argc, commit_argv, &revs, NULL);
1967                revs.edge_hint = 0; /* just in case */
1968                free(new_sha1_hex);
1969                if (old_sha1_hex) {
1970                        free(old_sha1_hex);
1971                        commit_argv[1] = NULL;
1972                }
1973
1974                /* Generate a list of objects that need to be pushed */
1975                pushing = 0;
1976                if (prepare_revision_walk(&revs))
1977                        die("revision walk setup failed");
1978                mark_edges_uninteresting(&revs, NULL);
1979                objects_to_send = get_delta(&revs, ref_lock);
1980                finish_all_active_slots();
1981
1982                /* Push missing objects to remote, this would be a
1983                   convenient time to pack them first if appropriate. */
1984                pushing = 1;
1985                if (objects_to_send)
1986                        fprintf(stderr, "    sending %d objects\n",
1987                                objects_to_send);
1988
1989                run_request_queue();
1990
1991                /* Update the remote branch if all went well */
1992                if (aborted || !update_remote(ref->new_sha1, ref_lock))
1993                        rc = 1;
1994
1995                if (!rc)
1996                        fprintf(stderr, "    done\n");
1997                if (helper_status)
1998                        printf("%s %s\n", !rc ? "ok" : "error", ref->name);
1999                unlock_remote(ref_lock);
2000                check_locks();
2001        }
2002
2003        /* Update remote server info if appropriate */
2004        if (repo->has_info_refs && new_refs) {
2005                if (info_ref_lock && repo->can_update_info_refs) {
2006                        fprintf(stderr, "Updating remote server info\n");
2007                        if (!dry_run)
2008                                update_remote_info_refs(info_ref_lock);
2009                } else {
2010                        fprintf(stderr, "Unable to update server info\n");
2011                }
2012        }
2013
2014 cleanup:
2015        if (info_ref_lock)
2016                unlock_remote(info_ref_lock);
2017        free(repo);
2018
2019        http_cleanup();
2020
2021        request = request_queue_head;
2022        while (request != NULL) {
2023                next_request = request->next;
2024                release_request(request);
2025                request = next_request;
2026        }
2027
2028        return rc;
2029}