Andrew's git / gitweb.git / transport.c
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transport.con commit msysgit: Add the --large-address-aware linker directive to the makefile. (fb99070)
   1#include "cache.h"
   2#include "transport.h"
   3#include "run-command.h"
   4#include "pkt-line.h"
   5#include "fetch-pack.h"
   6#include "send-pack.h"
   7#include "walker.h"
   8#include "bundle.h"
   9#include "dir.h"
  10#include "refs.h"
  11#include "branch.h"
  12#include "url.h"
  13#include "submodule.h"
  14#include "string-list.h"
  15
  16/* rsync support */
  17
  18/*
  19 * We copy packed-refs and refs/ into a temporary file, then read the
  20 * loose refs recursively (sorting whenever possible), and then inserting
  21 * those packed refs that are not yet in the list (not validating, but
  22 * assuming that the file is sorted).
  23 *
  24 * Appears refactoring this from refs.c is too cumbersome.
  25 */
  26
  27static int str_cmp(const void *a, const void *b)
  28{
  29        const char *s1 = a;
  30        const char *s2 = b;
  31
  32        return strcmp(s1, s2);
  33}
  34
  35/* path->buf + name_offset is expected to point to "refs/" */
  36
  37static int read_loose_refs(struct strbuf *path, int name_offset,
  38                struct ref **tail)
  39{
  40        DIR *dir = opendir(path->buf);
  41        struct dirent *de;
  42        struct {
  43                char **entries;
  44                int nr, alloc;
  45        } list;
  46        int i, pathlen;
  47
  48        if (!dir)
  49                return -1;
  50
  51        memset (&list, 0, sizeof(list));
  52
  53        while ((de = readdir(dir))) {
  54                if (is_dot_or_dotdot(de->d_name))
  55                        continue;
  56                ALLOC_GROW(list.entries, list.nr + 1, list.alloc);
  57                list.entries[list.nr++] = xstrdup(de->d_name);
  58        }
  59        closedir(dir);
  60
  61        /* sort the list */
  62
  63        qsort(list.entries, list.nr, sizeof(char *), str_cmp);
  64
  65        pathlen = path->len;
  66        strbuf_addch(path, '/');
  67
  68        for (i = 0; i < list.nr; i++, strbuf_setlen(path, pathlen + 1)) {
  69                strbuf_addstr(path, list.entries[i]);
  70                if (read_loose_refs(path, name_offset, tail)) {
  71                        int fd = open(path->buf, O_RDONLY);
  72                        char buffer[40];
  73                        struct ref *next;
  74
  75                        if (fd < 0)
  76                                continue;
  77                        next = alloc_ref(path->buf + name_offset);
  78                        if (read_in_full(fd, buffer, 40) != 40 ||
  79                                        get_sha1_hex(buffer, next->old_sha1)) {
  80                                close(fd);
  81                                free(next);
  82                                continue;
  83                        }
  84                        close(fd);
  85                        (*tail)->next = next;
  86                        *tail = next;
  87                }
  88        }
  89        strbuf_setlen(path, pathlen);
  90
  91        for (i = 0; i < list.nr; i++)
  92                free(list.entries[i]);
  93        free(list.entries);
  94
  95        return 0;
  96}
  97
  98/* insert the packed refs for which no loose refs were found */
  99
 100static void insert_packed_refs(const char *packed_refs, struct ref **list)
 101{
 102        FILE *f = fopen(packed_refs, "r");
 103        static char buffer[PATH_MAX];
 104
 105        if (!f)
 106                return;
 107
 108        for (;;) {
 109                int cmp = 0; /* assigned before used */
 110                int len;
 111
 112                if (!fgets(buffer, sizeof(buffer), f)) {
 113                        fclose(f);
 114                        return;
 115                }
 116
 117                if (hexval(buffer[0]) > 0xf)
 118                        continue;
 119                len = strlen(buffer);
 120                if (len && buffer[len - 1] == '\n')
 121                        buffer[--len] = '\0';
 122                if (len < 41)
 123                        continue;
 124                while ((*list)->next &&
 125                                (cmp = strcmp(buffer + 41,
 126                                      (*list)->next->name)) > 0)
 127                        list = &(*list)->next;
 128                if (!(*list)->next || cmp < 0) {
 129                        struct ref *next = alloc_ref(buffer + 41);
 130                        buffer[40] = '\0';
 131                        if (get_sha1_hex(buffer, next->old_sha1)) {
 132                                warning ("invalid SHA-1: %s", buffer);
 133                                free(next);
 134                                continue;
 135                        }
 136                        next->next = (*list)->next;
 137                        (*list)->next = next;
 138                        list = &(*list)->next;
 139                }
 140        }
 141}
 142
 143static void set_upstreams(struct transport *transport, struct ref *refs,
 144        int pretend)
 145{
 146        struct ref *ref;
 147        for (ref = refs; ref; ref = ref->next) {
 148                const char *localname;
 149                const char *tmp;
 150                const char *remotename;
 151                unsigned char sha[20];
 152                int flag = 0;
 153                /*
 154                 * Check suitability for tracking. Must be successful /
 155                 * already up-to-date ref create/modify (not delete).
 156                 */
 157                if (ref->status != REF_STATUS_OK &&
 158                        ref->status != REF_STATUS_UPTODATE)
 159                        continue;
 160                if (!ref->peer_ref)
 161                        continue;
 162                if (is_null_sha1(ref->new_sha1))
 163                        continue;
 164
 165                /* Follow symbolic refs (mainly for HEAD). */
 166                localname = ref->peer_ref->name;
 167                remotename = ref->name;
 168                tmp = resolve_ref_unsafe(localname, sha, 1, &flag);
 169                if (tmp && flag & REF_ISSYMREF &&
 170                        !prefixcmp(tmp, "refs/heads/"))
 171                        localname = tmp;
 172
 173                /* Both source and destination must be local branches. */
 174                if (!localname || prefixcmp(localname, "refs/heads/"))
 175                        continue;
 176                if (!remotename || prefixcmp(remotename, "refs/heads/"))
 177                        continue;
 178
 179                if (!pretend)
 180                        install_branch_config(BRANCH_CONFIG_VERBOSE,
 181                                localname + 11, transport->remote->name,
 182                                remotename);
 183                else
 184                        printf("Would set upstream of '%s' to '%s' of '%s'\n",
 185                                localname + 11, remotename + 11,
 186                                transport->remote->name);
 187        }
 188}
 189
 190static const char *rsync_url(const char *url)
 191{
 192        return prefixcmp(url, "rsync://") ? skip_prefix(url, "rsync:") : url;
 193}
 194
 195static struct ref *get_refs_via_rsync(struct transport *transport, int for_push)
 196{
 197        struct strbuf buf = STRBUF_INIT, temp_dir = STRBUF_INIT;
 198        struct ref dummy = {NULL}, *tail = &dummy;
 199        struct child_process rsync;
 200        const char *args[5];
 201        int temp_dir_len;
 202
 203        if (for_push)
 204                return NULL;
 205
 206        /* copy the refs to the temporary directory */
 207
 208        strbuf_addstr(&temp_dir, git_path("rsync-refs-XXXXXX"));
 209        if (!mkdtemp(temp_dir.buf))
 210                die_errno ("Could not make temporary directory");
 211        temp_dir_len = temp_dir.len;
 212
 213        strbuf_addstr(&buf, rsync_url(transport->url));
 214        strbuf_addstr(&buf, "/refs");
 215
 216        memset(&rsync, 0, sizeof(rsync));
 217        rsync.argv = args;
 218        rsync.stdout_to_stderr = 1;
 219        args[0] = "rsync";
 220        args[1] = (transport->verbose > 1) ? "-rv" : "-r";
 221        args[2] = buf.buf;
 222        args[3] = temp_dir.buf;
 223        args[4] = NULL;
 224
 225        if (run_command(&rsync))
 226                die ("Could not run rsync to get refs");
 227
 228        strbuf_reset(&buf);
 229        strbuf_addstr(&buf, rsync_url(transport->url));
 230        strbuf_addstr(&buf, "/packed-refs");
 231
 232        args[2] = buf.buf;
 233
 234        if (run_command(&rsync))
 235                die ("Could not run rsync to get refs");
 236
 237        /* read the copied refs */
 238
 239        strbuf_addstr(&temp_dir, "/refs");
 240        read_loose_refs(&temp_dir, temp_dir_len + 1, &tail);
 241        strbuf_setlen(&temp_dir, temp_dir_len);
 242
 243        tail = &dummy;
 244        strbuf_addstr(&temp_dir, "/packed-refs");
 245        insert_packed_refs(temp_dir.buf, &tail);
 246        strbuf_setlen(&temp_dir, temp_dir_len);
 247
 248        if (remove_dir_recursively(&temp_dir, 0))
 249                warning ("Error removing temporary directory %s.",
 250                                temp_dir.buf);
 251
 252        strbuf_release(&buf);
 253        strbuf_release(&temp_dir);
 254
 255        return dummy.next;
 256}
 257
 258static int fetch_objs_via_rsync(struct transport *transport,
 259                                int nr_objs, struct ref **to_fetch)
 260{
 261        struct strbuf buf = STRBUF_INIT;
 262        struct child_process rsync;
 263        const char *args[8];
 264        int result;
 265
 266        strbuf_addstr(&buf, rsync_url(transport->url));
 267        strbuf_addstr(&buf, "/objects/");
 268
 269        memset(&rsync, 0, sizeof(rsync));
 270        rsync.argv = args;
 271        rsync.stdout_to_stderr = 1;
 272        args[0] = "rsync";
 273        args[1] = (transport->verbose > 1) ? "-rv" : "-r";
 274        args[2] = "--ignore-existing";
 275        args[3] = "--exclude";
 276        args[4] = "info";
 277        args[5] = buf.buf;
 278        args[6] = get_object_directory();
 279        args[7] = NULL;
 280
 281        /* NEEDSWORK: handle one level of alternates */
 282        result = run_command(&rsync);
 283
 284        strbuf_release(&buf);
 285
 286        return result;
 287}
 288
 289static int write_one_ref(const char *name, const unsigned char *sha1,
 290                int flags, void *data)
 291{
 292        struct strbuf *buf = data;
 293        int len = buf->len;
 294        FILE *f;
 295
 296        /* when called via for_each_ref(), flags is non-zero */
 297        if (flags && prefixcmp(name, "refs/heads/") &&
 298                        prefixcmp(name, "refs/tags/"))
 299                return 0;
 300
 301        strbuf_addstr(buf, name);
 302        if (safe_create_leading_directories(buf->buf) ||
 303                        !(f = fopen(buf->buf, "w")) ||
 304                        fprintf(f, "%s\n", sha1_to_hex(sha1)) < 0 ||
 305                        fclose(f))
 306                return error("problems writing temporary file %s", buf->buf);
 307        strbuf_setlen(buf, len);
 308        return 0;
 309}
 310
 311static int write_refs_to_temp_dir(struct strbuf *temp_dir,
 312                int refspec_nr, const char **refspec)
 313{
 314        int i;
 315
 316        for (i = 0; i < refspec_nr; i++) {
 317                unsigned char sha1[20];
 318                char *ref;
 319
 320                if (dwim_ref(refspec[i], strlen(refspec[i]), sha1, &ref) != 1)
 321                        return error("Could not get ref %s", refspec[i]);
 322
 323                if (write_one_ref(ref, sha1, 0, temp_dir)) {
 324                        free(ref);
 325                        return -1;
 326                }
 327                free(ref);
 328        }
 329        return 0;
 330}
 331
 332static int rsync_transport_push(struct transport *transport,
 333                int refspec_nr, const char **refspec, int flags)
 334{
 335        struct strbuf buf = STRBUF_INIT, temp_dir = STRBUF_INIT;
 336        int result = 0, i;
 337        struct child_process rsync;
 338        const char *args[10];
 339
 340        if (flags & TRANSPORT_PUSH_MIRROR)
 341                return error("rsync transport does not support mirror mode");
 342
 343        /* first push the objects */
 344
 345        strbuf_addstr(&buf, rsync_url(transport->url));
 346        strbuf_addch(&buf, '/');
 347
 348        memset(&rsync, 0, sizeof(rsync));
 349        rsync.argv = args;
 350        rsync.stdout_to_stderr = 1;
 351        i = 0;
 352        args[i++] = "rsync";
 353        args[i++] = "-a";
 354        if (flags & TRANSPORT_PUSH_DRY_RUN)
 355                args[i++] = "--dry-run";
 356        if (transport->verbose > 1)
 357                args[i++] = "-v";
 358        args[i++] = "--ignore-existing";
 359        args[i++] = "--exclude";
 360        args[i++] = "info";
 361        args[i++] = get_object_directory();
 362        args[i++] = buf.buf;
 363        args[i++] = NULL;
 364
 365        if (run_command(&rsync))
 366                return error("Could not push objects to %s",
 367                                rsync_url(transport->url));
 368
 369        /* copy the refs to the temporary directory; they could be packed. */
 370
 371        strbuf_addstr(&temp_dir, git_path("rsync-refs-XXXXXX"));
 372        if (!mkdtemp(temp_dir.buf))
 373                die_errno ("Could not make temporary directory");
 374        strbuf_addch(&temp_dir, '/');
 375
 376        if (flags & TRANSPORT_PUSH_ALL) {
 377                if (for_each_ref(write_one_ref, &temp_dir))
 378                        return -1;
 379        } else if (write_refs_to_temp_dir(&temp_dir, refspec_nr, refspec))
 380                return -1;
 381
 382        i = 2;
 383        if (flags & TRANSPORT_PUSH_DRY_RUN)
 384                args[i++] = "--dry-run";
 385        if (!(flags & TRANSPORT_PUSH_FORCE))
 386                args[i++] = "--ignore-existing";
 387        args[i++] = temp_dir.buf;
 388        args[i++] = rsync_url(transport->url);
 389        args[i++] = NULL;
 390        if (run_command(&rsync))
 391                result = error("Could not push to %s",
 392                                rsync_url(transport->url));
 393
 394        if (remove_dir_recursively(&temp_dir, 0))
 395                warning ("Could not remove temporary directory %s.",
 396                                temp_dir.buf);
 397
 398        strbuf_release(&buf);
 399        strbuf_release(&temp_dir);
 400
 401        return result;
 402}
 403
 404struct bundle_transport_data {
 405        int fd;
 406        struct bundle_header header;
 407};
 408
 409static struct ref *get_refs_from_bundle(struct transport *transport, int for_push)
 410{
 411        struct bundle_transport_data *data = transport->data;
 412        struct ref *result = NULL;
 413        int i;
 414
 415        if (for_push)
 416                return NULL;
 417
 418        if (data->fd > 0)
 419                close(data->fd);
 420        data->fd = read_bundle_header(transport->url, &data->header);
 421        if (data->fd < 0)
 422                die ("Could not read bundle '%s'.", transport->url);
 423        for (i = 0; i < data->header.references.nr; i++) {
 424                struct ref_list_entry *e = data->header.references.list + i;
 425                struct ref *ref = alloc_ref(e->name);
 426                hashcpy(ref->old_sha1, e->sha1);
 427                ref->next = result;
 428                result = ref;
 429        }
 430        return result;
 431}
 432
 433static int fetch_refs_from_bundle(struct transport *transport,
 434                               int nr_heads, struct ref **to_fetch)
 435{
 436        struct bundle_transport_data *data = transport->data;
 437        return unbundle(&data->header, data->fd,
 438                        transport->progress ? BUNDLE_VERBOSE : 0);
 439}
 440
 441static int close_bundle(struct transport *transport)
 442{
 443        struct bundle_transport_data *data = transport->data;
 444        if (data->fd > 0)
 445                close(data->fd);
 446        free(data);
 447        return 0;
 448}
 449
 450struct git_transport_data {
 451        struct git_transport_options options;
 452        struct child_process *conn;
 453        int fd[2];
 454        unsigned got_remote_heads : 1;
 455        struct extra_have_objects extra_have;
 456};
 457
 458static int set_git_option(struct git_transport_options *opts,
 459                          const char *name, const char *value)
 460{
 461        if (!strcmp(name, TRANS_OPT_UPLOADPACK)) {
 462                opts->uploadpack = value;
 463                return 0;
 464        } else if (!strcmp(name, TRANS_OPT_RECEIVEPACK)) {
 465                opts->receivepack = value;
 466                return 0;
 467        } else if (!strcmp(name, TRANS_OPT_THIN)) {
 468                opts->thin = !!value;
 469                return 0;
 470        } else if (!strcmp(name, TRANS_OPT_FOLLOWTAGS)) {
 471                opts->followtags = !!value;
 472                return 0;
 473        } else if (!strcmp(name, TRANS_OPT_KEEP)) {
 474                opts->keep = !!value;
 475                return 0;
 476        } else if (!strcmp(name, TRANS_OPT_DEPTH)) {
 477                if (!value)
 478                        opts->depth = 0;
 479                else {
 480                        char *end;
 481                        opts->depth = strtol(value, &end, 0);
 482                        if (*end)
 483                                die("transport: invalid depth option '%s'", value);
 484                }
 485                return 0;
 486        }
 487        return 1;
 488}
 489
 490static int connect_setup(struct transport *transport, int for_push, int verbose)
 491{
 492        struct git_transport_data *data = transport->data;
 493
 494        if (data->conn)
 495                return 0;
 496
 497        data->conn = git_connect(data->fd, transport->url,
 498                                 for_push ? data->options.receivepack :
 499                                 data->options.uploadpack,
 500                                 verbose ? CONNECT_VERBOSE : 0);
 501
 502        return 0;
 503}
 504
 505static struct ref *get_refs_via_connect(struct transport *transport, int for_push)
 506{
 507        struct git_transport_data *data = transport->data;
 508        struct ref *refs;
 509
 510        connect_setup(transport, for_push, 0);
 511        get_remote_heads(data->fd[0], NULL, 0, &refs,
 512                         for_push ? REF_NORMAL : 0, &data->extra_have);
 513        data->got_remote_heads = 1;
 514
 515        return refs;
 516}
 517
 518static int fetch_refs_via_pack(struct transport *transport,
 519                               int nr_heads, struct ref **to_fetch)
 520{
 521        struct git_transport_data *data = transport->data;
 522        const struct ref *refs;
 523        char *dest = xstrdup(transport->url);
 524        struct fetch_pack_args args;
 525        struct ref *refs_tmp = NULL;
 526
 527        memset(&args, 0, sizeof(args));
 528        args.uploadpack = data->options.uploadpack;
 529        args.keep_pack = data->options.keep;
 530        args.lock_pack = 1;
 531        args.use_thin_pack = data->options.thin;
 532        args.include_tag = data->options.followtags;
 533        args.verbose = (transport->verbose > 1);
 534        args.quiet = (transport->verbose < 0);
 535        args.no_progress = !transport->progress;
 536        args.depth = data->options.depth;
 537
 538        if (!data->got_remote_heads) {
 539                connect_setup(transport, 0, 0);
 540                get_remote_heads(data->fd[0], NULL, 0, &refs_tmp, 0, NULL);
 541                data->got_remote_heads = 1;
 542        }
 543
 544        refs = fetch_pack(&args, data->fd, data->conn,
 545                          refs_tmp ? refs_tmp : transport->remote_refs,
 546                          dest, to_fetch, nr_heads,
 547                          &transport->pack_lockfile);
 548        close(data->fd[0]);
 549        close(data->fd[1]);
 550        if (finish_connect(data->conn))
 551                refs = NULL;
 552        data->conn = NULL;
 553        data->got_remote_heads = 0;
 554
 555        free_refs(refs_tmp);
 556
 557        free(dest);
 558        return (refs ? 0 : -1);
 559}
 560
 561static int push_had_errors(struct ref *ref)
 562{
 563        for (; ref; ref = ref->next) {
 564                switch (ref->status) {
 565                case REF_STATUS_NONE:
 566                case REF_STATUS_UPTODATE:
 567                case REF_STATUS_OK:
 568                        break;
 569                default:
 570                        return 1;
 571                }
 572        }
 573        return 0;
 574}
 575
 576int transport_refs_pushed(struct ref *ref)
 577{
 578        for (; ref; ref = ref->next) {
 579                switch(ref->status) {
 580                case REF_STATUS_NONE:
 581                case REF_STATUS_UPTODATE:
 582                        break;
 583                default:
 584                        return 1;
 585                }
 586        }
 587        return 0;
 588}
 589
 590void transport_update_tracking_ref(struct remote *remote, struct ref *ref, int verbose)
 591{
 592        struct refspec rs;
 593
 594        if (ref->status != REF_STATUS_OK && ref->status != REF_STATUS_UPTODATE)
 595                return;
 596
 597        rs.src = ref->name;
 598        rs.dst = NULL;
 599
 600        if (!remote_find_tracking(remote, &rs)) {
 601                if (verbose)
 602                        fprintf(stderr, "updating local tracking ref '%s'\n", rs.dst);
 603                if (ref->deletion) {
 604                        delete_ref(rs.dst, NULL, 0);
 605                } else
 606                        update_ref("update by push", rs.dst,
 607                                        ref->new_sha1, NULL, 0, 0);
 608                free(rs.dst);
 609        }
 610}
 611
 612static void print_ref_status(char flag, const char *summary, struct ref *to, struct ref *from, const char *msg, int porcelain)
 613{
 614        if (porcelain) {
 615                if (from)
 616                        fprintf(stdout, "%c\t%s:%s\t", flag, from->name, to->name);
 617                else
 618                        fprintf(stdout, "%c\t:%s\t", flag, to->name);
 619                if (msg)
 620                        fprintf(stdout, "%s (%s)\n", summary, msg);
 621                else
 622                        fprintf(stdout, "%s\n", summary);
 623        } else {
 624                fprintf(stderr, " %c %-*s ", flag, TRANSPORT_SUMMARY_WIDTH, summary);
 625                if (from)
 626                        fprintf(stderr, "%s -> %s", prettify_refname(from->name), prettify_refname(to->name));
 627                else
 628                        fputs(prettify_refname(to->name), stderr);
 629                if (msg) {
 630                        fputs(" (", stderr);
 631                        fputs(msg, stderr);
 632                        fputc(')', stderr);
 633                }
 634                fputc('\n', stderr);
 635        }
 636}
 637
 638static const char *status_abbrev(unsigned char sha1[20])
 639{
 640        return find_unique_abbrev(sha1, DEFAULT_ABBREV);
 641}
 642
 643static void print_ok_ref_status(struct ref *ref, int porcelain)
 644{
 645        if (ref->deletion)
 646                print_ref_status('-', "[deleted]", ref, NULL, NULL, porcelain);
 647        else if (is_null_sha1(ref->old_sha1))
 648                print_ref_status('*',
 649                        (!prefixcmp(ref->name, "refs/tags/") ? "[new tag]" :
 650                        "[new branch]"),
 651                        ref, ref->peer_ref, NULL, porcelain);
 652        else {
 653                char quickref[84];
 654                char type;
 655                const char *msg;
 656
 657                strcpy(quickref, status_abbrev(ref->old_sha1));
 658                if (ref->forced_update) {
 659                        strcat(quickref, "...");
 660                        type = '+';
 661                        msg = "forced update";
 662                } else {
 663                        strcat(quickref, "..");
 664                        type = ' ';
 665                        msg = NULL;
 666                }
 667                strcat(quickref, status_abbrev(ref->new_sha1));
 668
 669                print_ref_status(type, quickref, ref, ref->peer_ref, msg, porcelain);
 670        }
 671}
 672
 673static int print_one_push_status(struct ref *ref, const char *dest, int count, int porcelain)
 674{
 675        if (!count)
 676                fprintf(porcelain ? stdout : stderr, "To %s\n", dest);
 677
 678        switch(ref->status) {
 679        case REF_STATUS_NONE:
 680                print_ref_status('X', "[no match]", ref, NULL, NULL, porcelain);
 681                break;
 682        case REF_STATUS_REJECT_NODELETE:
 683                print_ref_status('!', "[rejected]", ref, NULL,
 684                                                 "remote does not support deleting refs", porcelain);
 685                break;
 686        case REF_STATUS_UPTODATE:
 687                print_ref_status('=', "[up to date]", ref,
 688                                                 ref->peer_ref, NULL, porcelain);
 689                break;
 690        case REF_STATUS_REJECT_NONFASTFORWARD:
 691                print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 692                                                 "non-fast-forward", porcelain);
 693                break;
 694        case REF_STATUS_REJECT_ALREADY_EXISTS:
 695                print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 696                                                 "already exists", porcelain);
 697                break;
 698        case REF_STATUS_REJECT_FETCH_FIRST:
 699                print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 700                                                 "fetch first", porcelain);
 701                break;
 702        case REF_STATUS_REJECT_NEEDS_FORCE:
 703                print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 704                                                 "needs force", porcelain);
 705                break;
 706        case REF_STATUS_REMOTE_REJECT:
 707                print_ref_status('!', "[remote rejected]", ref,
 708                                                 ref->deletion ? NULL : ref->peer_ref,
 709                                                 ref->remote_status, porcelain);
 710                break;
 711        case REF_STATUS_EXPECTING_REPORT:
 712                print_ref_status('!', "[remote failure]", ref,
 713                                                 ref->deletion ? NULL : ref->peer_ref,
 714                                                 "remote failed to report status", porcelain);
 715                break;
 716        case REF_STATUS_OK:
 717                print_ok_ref_status(ref, porcelain);
 718                break;
 719        }
 720
 721        return 1;
 722}
 723
 724void transport_print_push_status(const char *dest, struct ref *refs,
 725                                  int verbose, int porcelain, unsigned int *reject_reasons)
 726{
 727        struct ref *ref;
 728        int n = 0;
 729        unsigned char head_sha1[20];
 730        char *head;
 731
 732        head = resolve_refdup("HEAD", head_sha1, 1, NULL);
 733
 734        if (verbose) {
 735                for (ref = refs; ref; ref = ref->next)
 736                        if (ref->status == REF_STATUS_UPTODATE)
 737                                n += print_one_push_status(ref, dest, n, porcelain);
 738        }
 739
 740        for (ref = refs; ref; ref = ref->next)
 741                if (ref->status == REF_STATUS_OK)
 742                        n += print_one_push_status(ref, dest, n, porcelain);
 743
 744        *reject_reasons = 0;
 745        for (ref = refs; ref; ref = ref->next) {
 746                if (ref->status != REF_STATUS_NONE &&
 747                    ref->status != REF_STATUS_UPTODATE &&
 748                    ref->status != REF_STATUS_OK)
 749                        n += print_one_push_status(ref, dest, n, porcelain);
 750                if (ref->status == REF_STATUS_REJECT_NONFASTFORWARD) {
 751                        if (head != NULL && !strcmp(head, ref->name))
 752                                *reject_reasons |= REJECT_NON_FF_HEAD;
 753                        else
 754                                *reject_reasons |= REJECT_NON_FF_OTHER;
 755                } else if (ref->status == REF_STATUS_REJECT_ALREADY_EXISTS) {
 756                        *reject_reasons |= REJECT_ALREADY_EXISTS;
 757                } else if (ref->status == REF_STATUS_REJECT_FETCH_FIRST) {
 758                        *reject_reasons |= REJECT_FETCH_FIRST;
 759                } else if (ref->status == REF_STATUS_REJECT_NEEDS_FORCE) {
 760                        *reject_reasons |= REJECT_NEEDS_FORCE;
 761                }
 762        }
 763}
 764
 765void transport_verify_remote_names(int nr_heads, const char **heads)
 766{
 767        int i;
 768
 769        for (i = 0; i < nr_heads; i++) {
 770                const char *local = heads[i];
 771                const char *remote = strrchr(heads[i], ':');
 772
 773                if (*local == '+')
 774                        local++;
 775
 776                /* A matching refspec is okay.  */
 777                if (remote == local && remote[1] == '\0')
 778                        continue;
 779
 780                remote = remote ? (remote + 1) : local;
 781                if (check_refname_format(remote,
 782                                REFNAME_ALLOW_ONELEVEL|REFNAME_REFSPEC_PATTERN))
 783                        die("remote part of refspec is not a valid name in %s",
 784                                heads[i]);
 785        }
 786}
 787
 788static int git_transport_push(struct transport *transport, struct ref *remote_refs, int flags)
 789{
 790        struct git_transport_data *data = transport->data;
 791        struct send_pack_args args;
 792        int ret;
 793
 794        if (!data->got_remote_heads) {
 795                struct ref *tmp_refs;
 796                connect_setup(transport, 1, 0);
 797
 798                get_remote_heads(data->fd[0], NULL, 0, &tmp_refs, REF_NORMAL, NULL);
 799                data->got_remote_heads = 1;
 800        }
 801
 802        memset(&args, 0, sizeof(args));
 803        args.send_mirror = !!(flags & TRANSPORT_PUSH_MIRROR);
 804        args.force_update = !!(flags & TRANSPORT_PUSH_FORCE);
 805        args.use_thin_pack = data->options.thin;
 806        args.verbose = (transport->verbose > 0);
 807        args.quiet = (transport->verbose < 0);
 808        args.progress = transport->progress;
 809        args.dry_run = !!(flags & TRANSPORT_PUSH_DRY_RUN);
 810        args.porcelain = !!(flags & TRANSPORT_PUSH_PORCELAIN);
 811
 812        ret = send_pack(&args, data->fd, data->conn, remote_refs,
 813                        &data->extra_have);
 814
 815        close(data->fd[1]);
 816        close(data->fd[0]);
 817        ret |= finish_connect(data->conn);
 818        data->conn = NULL;
 819        data->got_remote_heads = 0;
 820
 821        return ret;
 822}
 823
 824static int connect_git(struct transport *transport, const char *name,
 825                       const char *executable, int fd[2])
 826{
 827        struct git_transport_data *data = transport->data;
 828        data->conn = git_connect(data->fd, transport->url,
 829                                 executable, 0);
 830        fd[0] = data->fd[0];
 831        fd[1] = data->fd[1];
 832        return 0;
 833}
 834
 835static int disconnect_git(struct transport *transport)
 836{
 837        struct git_transport_data *data = transport->data;
 838        if (data->conn) {
 839                if (data->got_remote_heads)
 840                        packet_flush(data->fd[1]);
 841                close(data->fd[0]);
 842                close(data->fd[1]);
 843                finish_connect(data->conn);
 844        }
 845
 846        free(data);
 847        return 0;
 848}
 849
 850void transport_take_over(struct transport *transport,
 851                         struct child_process *child)
 852{
 853        struct git_transport_data *data;
 854
 855        if (!transport->smart_options)
 856                die("Bug detected: Taking over transport requires non-NULL "
 857                    "smart_options field.");
 858
 859        data = xcalloc(1, sizeof(*data));
 860        data->options = *transport->smart_options;
 861        data->conn = child;
 862        data->fd[0] = data->conn->out;
 863        data->fd[1] = data->conn->in;
 864        data->got_remote_heads = 0;
 865        transport->data = data;
 866
 867        transport->set_option = NULL;
 868        transport->get_refs_list = get_refs_via_connect;
 869        transport->fetch = fetch_refs_via_pack;
 870        transport->push = NULL;
 871        transport->push_refs = git_transport_push;
 872        transport->disconnect = disconnect_git;
 873        transport->smart_options = &(data->options);
 874}
 875
 876static int is_local(const char *url)
 877{
 878        const char *colon = strchr(url, ':');
 879        const char *slash = strchr(url, '/');
 880        return !colon || (slash && slash < colon) ||
 881                has_dos_drive_prefix(url);
 882}
 883
 884static int is_file(const char *url)
 885{
 886        struct stat buf;
 887        if (stat(url, &buf))
 888                return 0;
 889        return S_ISREG(buf.st_mode);
 890}
 891
 892static int external_specification_len(const char *url)
 893{
 894        return strchr(url, ':') - url;
 895}
 896
 897struct transport *transport_get(struct remote *remote, const char *url)
 898{
 899        const char *helper;
 900        struct transport *ret = xcalloc(1, sizeof(*ret));
 901
 902        ret->progress = isatty(2);
 903
 904        if (!remote)
 905                die("No remote provided to transport_get()");
 906
 907        ret->got_remote_refs = 0;
 908        ret->remote = remote;
 909        helper = remote->foreign_vcs;
 910
 911        if (!url && remote->url)
 912                url = remote->url[0];
 913        ret->url = url;
 914
 915        /* maybe it is a foreign URL? */
 916        if (url) {
 917                const char *p = url;
 918
 919                while (is_urlschemechar(p == url, *p))
 920                        p++;
 921                if (!prefixcmp(p, "::"))
 922                        helper = xstrndup(url, p - url);
 923        }
 924
 925        if (helper) {
 926                transport_helper_init(ret, helper);
 927        } else if (!prefixcmp(url, "rsync:")) {
 928                ret->get_refs_list = get_refs_via_rsync;
 929                ret->fetch = fetch_objs_via_rsync;
 930                ret->push = rsync_transport_push;
 931                ret->smart_options = NULL;
 932        } else if (is_local(url) && is_file(url) && is_bundle(url, 1)) {
 933                struct bundle_transport_data *data = xcalloc(1, sizeof(*data));
 934                ret->data = data;
 935                ret->get_refs_list = get_refs_from_bundle;
 936                ret->fetch = fetch_refs_from_bundle;
 937                ret->disconnect = close_bundle;
 938                ret->smart_options = NULL;
 939        } else if (!is_url(url)
 940                || !prefixcmp(url, "file://")
 941                || !prefixcmp(url, "git://")
 942                || !prefixcmp(url, "ssh://")
 943                || !prefixcmp(url, "git+ssh://")
 944                || !prefixcmp(url, "ssh+git://")) {
 945                /* These are builtin smart transports. */
 946                struct git_transport_data *data = xcalloc(1, sizeof(*data));
 947                ret->data = data;
 948                ret->set_option = NULL;
 949                ret->get_refs_list = get_refs_via_connect;
 950                ret->fetch = fetch_refs_via_pack;
 951                ret->push_refs = git_transport_push;
 952                ret->connect = connect_git;
 953                ret->disconnect = disconnect_git;
 954                ret->smart_options = &(data->options);
 955
 956                data->conn = NULL;
 957                data->got_remote_heads = 0;
 958        } else {
 959                /* Unknown protocol in URL. Pass to external handler. */
 960                int len = external_specification_len(url);
 961                char *handler = xmalloc(len + 1);
 962                handler[len] = 0;
 963                strncpy(handler, url, len);
 964                transport_helper_init(ret, handler);
 965        }
 966
 967        if (ret->smart_options) {
 968                ret->smart_options->thin = 1;
 969                ret->smart_options->uploadpack = "git-upload-pack";
 970                if (remote->uploadpack)
 971                        ret->smart_options->uploadpack = remote->uploadpack;
 972                ret->smart_options->receivepack = "git-receive-pack";
 973                if (remote->receivepack)
 974                        ret->smart_options->receivepack = remote->receivepack;
 975        }
 976
 977        return ret;
 978}
 979
 980int transport_set_option(struct transport *transport,
 981                         const char *name, const char *value)
 982{
 983        int git_reports = 1, protocol_reports = 1;
 984
 985        if (transport->smart_options)
 986                git_reports = set_git_option(transport->smart_options,
 987                                             name, value);
 988
 989        if (transport->set_option)
 990                protocol_reports = transport->set_option(transport, name,
 991                                                        value);
 992
 993        /* If either report is 0, report 0 (success). */
 994        if (!git_reports || !protocol_reports)
 995                return 0;
 996        /* If either reports -1 (invalid value), report -1. */
 997        if ((git_reports == -1) || (protocol_reports == -1))
 998                return -1;
 999        /* Otherwise if both report unknown, report unknown. */
1000        return 1;
1001}
1002
1003void transport_set_verbosity(struct transport *transport, int verbosity,
1004        int force_progress)
1005{
1006        if (verbosity >= 1)
1007                transport->verbose = verbosity <= 3 ? verbosity : 3;
1008        if (verbosity < 0)
1009                transport->verbose = -1;
1010
1011        /**
1012         * Rules used to determine whether to report progress (processing aborts
1013         * when a rule is satisfied):
1014         *
1015         *   . Report progress, if force_progress is 1 (ie. --progress).
1016         *   . Don't report progress, if force_progress is 0 (ie. --no-progress).
1017         *   . Don't report progress, if verbosity < 0 (ie. -q/--quiet ).
1018         *   . Report progress if isatty(2) is 1.
1019         **/
1020        if (force_progress >= 0)
1021                transport->progress = !!force_progress;
1022        else
1023                transport->progress = verbosity >= 0 && isatty(2);
1024}
1025
1026static void die_with_unpushed_submodules(struct string_list *needs_pushing)
1027{
1028        int i;
1029
1030        fprintf(stderr, "The following submodule paths contain changes that can\n"
1031                        "not be found on any remote:\n");
1032        for (i = 0; i < needs_pushing->nr; i++)
1033                printf("  %s\n", needs_pushing->items[i].string);
1034        fprintf(stderr, "\nPlease try\n\n"
1035                        "       git push --recurse-submodules=on-demand\n\n"
1036                        "or cd to the path and use\n\n"
1037                        "       git push\n\n"
1038                        "to push them to a remote.\n\n");
1039
1040        string_list_clear(needs_pushing, 0);
1041
1042        die("Aborting.");
1043}
1044
1045static int run_pre_push_hook(struct transport *transport,
1046                             struct ref *remote_refs)
1047{
1048        int ret = 0, x;
1049        struct ref *r;
1050        struct child_process proc;
1051        struct strbuf buf;
1052        const char *argv[4];
1053
1054        if (!(argv[0] = find_hook("pre-push")))
1055                return 0;
1056
1057        argv[1] = transport->remote->name;
1058        argv[2] = transport->url;
1059        argv[3] = NULL;
1060
1061        memset(&proc, 0, sizeof(proc));
1062        proc.argv = argv;
1063        proc.in = -1;
1064
1065        if (start_command(&proc)) {
1066                finish_command(&proc);
1067                return -1;
1068        }
1069
1070        strbuf_init(&buf, 256);
1071
1072        for (r = remote_refs; r; r = r->next) {
1073                if (!r->peer_ref) continue;
1074                if (r->status == REF_STATUS_REJECT_NONFASTFORWARD) continue;
1075                if (r->status == REF_STATUS_UPTODATE) continue;
1076
1077                strbuf_reset(&buf);
1078                strbuf_addf( &buf, "%s %s %s %s\n",
1079                         r->peer_ref->name, sha1_to_hex(r->new_sha1),
1080                         r->name, sha1_to_hex(r->old_sha1));
1081
1082                if (write_in_full(proc.in, buf.buf, buf.len) != buf.len) {
1083                        ret = -1;
1084                        break;
1085                }
1086        }
1087
1088        strbuf_release(&buf);
1089
1090        x = close(proc.in);
1091        if (!ret)
1092                ret = x;
1093
1094        x = finish_command(&proc);
1095        if (!ret)
1096                ret = x;
1097
1098        return ret;
1099}
1100
1101int transport_push(struct transport *transport,
1102                   int refspec_nr, const char **refspec, int flags,
1103                   unsigned int *reject_reasons)
1104{
1105        *reject_reasons = 0;
1106        transport_verify_remote_names(refspec_nr, refspec);
1107
1108        if (transport->push) {
1109                /* Maybe FIXME. But no important transport uses this case. */
1110                if (flags & TRANSPORT_PUSH_SET_UPSTREAM)
1111                        die("This transport does not support using --set-upstream");
1112
1113                return transport->push(transport, refspec_nr, refspec, flags);
1114        } else if (transport->push_refs) {
1115                struct ref *remote_refs =
1116                        transport->get_refs_list(transport, 1);
1117                struct ref *local_refs = get_local_heads();
1118                int match_flags = MATCH_REFS_NONE;
1119                int verbose = (transport->verbose > 0);
1120                int quiet = (transport->verbose < 0);
1121                int porcelain = flags & TRANSPORT_PUSH_PORCELAIN;
1122                int pretend = flags & TRANSPORT_PUSH_DRY_RUN;
1123                int push_ret, ret, err;
1124
1125                if (flags & TRANSPORT_PUSH_ALL)
1126                        match_flags |= MATCH_REFS_ALL;
1127                if (flags & TRANSPORT_PUSH_MIRROR)
1128                        match_flags |= MATCH_REFS_MIRROR;
1129                if (flags & TRANSPORT_PUSH_PRUNE)
1130                        match_flags |= MATCH_REFS_PRUNE;
1131                if (flags & TRANSPORT_PUSH_FOLLOW_TAGS)
1132                        match_flags |= MATCH_REFS_FOLLOW_TAGS;
1133
1134                if (match_push_refs(local_refs, &remote_refs,
1135                                    refspec_nr, refspec, match_flags)) {
1136                        return -1;
1137                }
1138
1139                set_ref_status_for_push(remote_refs,
1140                        flags & TRANSPORT_PUSH_MIRROR,
1141                        flags & TRANSPORT_PUSH_FORCE);
1142
1143                if (!(flags & TRANSPORT_PUSH_NO_HOOK))
1144                        if (run_pre_push_hook(transport, remote_refs))
1145                                return -1;
1146
1147                if ((flags & TRANSPORT_RECURSE_SUBMODULES_ON_DEMAND) && !is_bare_repository()) {
1148                        struct ref *ref = remote_refs;
1149                        for (; ref; ref = ref->next)
1150                                if (!is_null_sha1(ref->new_sha1) &&
1151                                    !push_unpushed_submodules(ref->new_sha1,
1152                                            transport->remote->name))
1153                                    die ("Failed to push all needed submodules!");
1154                }
1155
1156                if ((flags & (TRANSPORT_RECURSE_SUBMODULES_ON_DEMAND |
1157                              TRANSPORT_RECURSE_SUBMODULES_CHECK)) && !is_bare_repository()) {
1158                        struct ref *ref = remote_refs;
1159                        struct string_list needs_pushing;
1160
1161                        memset(&needs_pushing, 0, sizeof(struct string_list));
1162                        needs_pushing.strdup_strings = 1;
1163                        for (; ref; ref = ref->next)
1164                                if (!is_null_sha1(ref->new_sha1) &&
1165                                    find_unpushed_submodules(ref->new_sha1,
1166                                            transport->remote->name, &needs_pushing))
1167                                        die_with_unpushed_submodules(&needs_pushing);
1168                }
1169
1170                push_ret = transport->push_refs(transport, remote_refs, flags);
1171                err = push_had_errors(remote_refs);
1172                ret = push_ret | err;
1173
1174                if (!quiet || err)
1175                        transport_print_push_status(transport->url, remote_refs,
1176                                        verbose | porcelain, porcelain,
1177                                        reject_reasons);
1178
1179                if (flags & TRANSPORT_PUSH_SET_UPSTREAM)
1180                        set_upstreams(transport, remote_refs, pretend);
1181
1182                if (!(flags & TRANSPORT_PUSH_DRY_RUN)) {
1183                        struct ref *ref;
1184                        for (ref = remote_refs; ref; ref = ref->next)
1185                                transport_update_tracking_ref(transport->remote, ref, verbose);
1186                }
1187
1188                if (porcelain && !push_ret)
1189                        puts("Done");
1190                else if (!quiet && !ret && !transport_refs_pushed(remote_refs))
1191                        fprintf(stderr, "Everything up-to-date\n");
1192
1193                return ret;
1194        }
1195        return 1;
1196}
1197
1198const struct ref *transport_get_remote_refs(struct transport *transport)
1199{
1200        if (!transport->got_remote_refs) {
1201                transport->remote_refs = transport->get_refs_list(transport, 0);
1202                transport->got_remote_refs = 1;
1203        }
1204
1205        return transport->remote_refs;
1206}
1207
1208int transport_fetch_refs(struct transport *transport, struct ref *refs)
1209{
1210        int rc;
1211        int nr_heads = 0, nr_alloc = 0, nr_refs = 0;
1212        struct ref **heads = NULL;
1213        struct ref *rm;
1214
1215        for (rm = refs; rm; rm = rm->next) {
1216                nr_refs++;
1217                if (rm->peer_ref &&
1218                    !is_null_sha1(rm->old_sha1) &&
1219                    !hashcmp(rm->peer_ref->old_sha1, rm->old_sha1))
1220                        continue;
1221                ALLOC_GROW(heads, nr_heads + 1, nr_alloc);
1222                heads[nr_heads++] = rm;
1223        }
1224
1225        if (!nr_heads) {
1226                /*
1227                 * When deepening of a shallow repository is requested,
1228                 * then local and remote refs are likely to still be equal.
1229                 * Just feed them all to the fetch method in that case.
1230                 * This condition shouldn't be met in a non-deepening fetch
1231                 * (see builtin-fetch.c:quickfetch()).
1232                 */
1233                heads = xmalloc(nr_refs * sizeof(*heads));
1234                for (rm = refs; rm; rm = rm->next)
1235                        heads[nr_heads++] = rm;
1236        }
1237
1238        rc = transport->fetch(transport, nr_heads, heads);
1239
1240        free(heads);
1241        return rc;
1242}
1243
1244void transport_unlock_pack(struct transport *transport)
1245{
1246        if (transport->pack_lockfile) {
1247                unlink_or_warn(transport->pack_lockfile);
1248                free(transport->pack_lockfile);
1249                transport->pack_lockfile = NULL;
1250        }
1251}
1252
1253int transport_connect(struct transport *transport, const char *name,
1254                      const char *exec, int fd[2])
1255{
1256        if (transport->connect)
1257                return transport->connect(transport, name, exec, fd);
1258        else
1259                die("Operation not supported by protocol");
1260}
1261
1262int transport_disconnect(struct transport *transport)
1263{
1264        int ret = 0;
1265        if (transport->disconnect)
1266                ret = transport->disconnect(transport);
1267        free(transport);
1268        return ret;
1269}
1270
1271/*
1272 * Strip username (and password) from a URL and return
1273 * it in a newly allocated string.
1274 */
1275char *transport_anonymize_url(const char *url)
1276{
1277        char *anon_url, *scheme_prefix, *anon_part;
1278        size_t anon_len, prefix_len = 0;
1279
1280        anon_part = strchr(url, '@');
1281        if (is_local(url) || !anon_part)
1282                goto literal_copy;
1283
1284        anon_len = strlen(++anon_part);
1285        scheme_prefix = strstr(url, "://");
1286        if (!scheme_prefix) {
1287                if (!strchr(anon_part, ':'))
1288                        /* cannot be "me@there:/path/name" */
1289                        goto literal_copy;
1290        } else {
1291                const char *cp;
1292                /* make sure scheme is reasonable */
1293                for (cp = url; cp < scheme_prefix; cp++) {
1294                        switch (*cp) {
1295                                /* RFC 1738 2.1 */
1296                        case '+': case '.': case '-':
1297                                break; /* ok */
1298                        default:
1299                                if (isalnum(*cp))
1300                                        break;
1301                                /* it isn't */
1302                                goto literal_copy;
1303                        }
1304                }
1305                /* @ past the first slash does not count */
1306                cp = strchr(scheme_prefix + 3, '/');
1307                if (cp && cp < anon_part)
1308                        goto literal_copy;
1309                prefix_len = scheme_prefix - url + 3;
1310        }
1311        anon_url = xcalloc(1, 1 + prefix_len + anon_len);
1312        memcpy(anon_url, url, prefix_len);
1313        memcpy(anon_url + prefix_len, anon_part, anon_len);
1314        return anon_url;
1315literal_copy:
1316        return xstrdup(url);
1317}
1318
1319struct alternate_refs_data {
1320        alternate_ref_fn *fn;
1321        void *data;
1322};
1323
1324static int refs_from_alternate_cb(struct alternate_object_database *e,
1325                                  void *data)
1326{
1327        char *other;
1328        size_t len;
1329        struct remote *remote;
1330        struct transport *transport;
1331        const struct ref *extra;
1332        struct alternate_refs_data *cb = data;
1333
1334        e->name[-1] = '\0';
1335        other = xstrdup(real_path(e->base));
1336        e->name[-1] = '/';
1337        len = strlen(other);
1338
1339        while (other[len-1] == '/')
1340                other[--len] = '\0';
1341        if (len < 8 || memcmp(other + len - 8, "/objects", 8))
1342                return 0;
1343        /* Is this a git repository with refs? */
1344        memcpy(other + len - 8, "/refs", 6);
1345        if (!is_directory(other))
1346                return 0;
1347        other[len - 8] = '\0';
1348        remote = remote_get(other);
1349        transport = transport_get(remote, other);
1350        for (extra = transport_get_remote_refs(transport);
1351             extra;
1352             extra = extra->next)
1353                cb->fn(extra, cb->data);
1354        transport_disconnect(transport);
1355        free(other);
1356        return 0;
1357}
1358
1359void for_each_alternate_ref(alternate_ref_fn fn, void *data)
1360{
1361        struct alternate_refs_data cb;
1362        cb.fn = fn;
1363        cb.data = data;
1364        foreach_alt_odb(refs_from_alternate_cb, &cb);
1365}