97eed6cbf6bb7e076bd46f5d59cb5e66ac47ccc5
   1#include "cache.h"
   2#include "transport.h"
   3#include "quote.h"
   4#include "run-command.h"
   5#include "commit.h"
   6#include "diff.h"
   7#include "revision.h"
   8#include "quote.h"
   9#include "remote.h"
  10
  11static int debug;
  12
  13struct helper_data
  14{
  15        const char *name;
  16        struct child_process *helper;
  17        FILE *out;
  18        unsigned fetch : 1,
  19                import : 1,
  20                option : 1,
  21                push : 1;
  22        /* These go from remote name (as in "list") to private name */
  23        struct refspec *refspecs;
  24        int refspec_nr;
  25        /* Transport options for fetch-pack/send-pack (should one of
  26         * those be invoked).
  27         */
  28        struct git_transport_options transport_options;
  29};
  30
  31static void sendline(struct helper_data *helper, struct strbuf *buffer)
  32{
  33        if (debug)
  34                fprintf(stderr, "Debug: Remote helper: -> %s", buffer->buf);
  35        if (write_in_full(helper->helper->in, buffer->buf, buffer->len)
  36                != buffer->len)
  37                die_errno("Full write to remote helper failed");
  38}
  39
  40static int recvline(struct helper_data *helper, struct strbuf *buffer)
  41{
  42        strbuf_reset(buffer);
  43        if (debug)
  44                fprintf(stderr, "Debug: Remote helper: Waiting...\n");
  45        if (strbuf_getline(buffer, helper->out, '\n') == EOF) {
  46                if (debug)
  47                        fprintf(stderr, "Debug: Remote helper quit.\n");
  48                exit(128);
  49        }
  50
  51        if (debug)
  52                fprintf(stderr, "Debug: Remote helper: <- %s\n", buffer->buf);
  53        return 0;
  54}
  55
  56static void xchgline(struct helper_data *helper, struct strbuf *buffer)
  57{
  58        sendline(helper, buffer);
  59        recvline(helper, buffer);
  60}
  61
  62static void write_constant(int fd, const char *str)
  63{
  64        if (debug)
  65                fprintf(stderr, "Debug: Remote helper: -> %s", str);
  66        if (write_in_full(fd, str, strlen(str)) != strlen(str))
  67                die_errno("Full write to remote helper failed");
  68}
  69
  70const char *remove_ext_force(const char *url)
  71{
  72        if (url) {
  73                const char *colon = strchr(url, ':');
  74                if (colon && colon[1] == ':')
  75                        return colon + 2;
  76        }
  77        return url;
  78}
  79
  80static struct child_process *get_helper(struct transport *transport)
  81{
  82        struct helper_data *data = transport->data;
  83        struct strbuf buf = STRBUF_INIT;
  84        struct child_process *helper;
  85        const char **refspecs = NULL;
  86        int refspec_nr = 0;
  87        int refspec_alloc = 0;
  88        int duped;
  89
  90        if (data->helper)
  91                return data->helper;
  92
  93        helper = xcalloc(1, sizeof(*helper));
  94        helper->in = -1;
  95        helper->out = -1;
  96        helper->err = 0;
  97        helper->argv = xcalloc(4, sizeof(*helper->argv));
  98        strbuf_addf(&buf, "remote-%s", data->name);
  99        helper->argv[0] = strbuf_detach(&buf, NULL);
 100        helper->argv[1] = transport->remote->name;
 101        helper->argv[2] = remove_ext_force(transport->url);
 102        helper->git_cmd = 1;
 103        if (start_command(helper))
 104                die("Unable to run helper: git %s", helper->argv[0]);
 105        data->helper = helper;
 106
 107        /*
 108         * Open the output as FILE* so strbuf_getline() can be used.
 109         * Do this with duped fd because fclose() will close the fd,
 110         * and stuff like taking over will require the fd to remain.
 111         *
 112         */
 113        duped = dup(helper->out);
 114        if (duped < 0)
 115                die_errno("Can't dup helper output fd");
 116        data->out = xfdopen(duped, "r");
 117
 118        write_constant(helper->in, "capabilities\n");
 119
 120        while (1) {
 121                const char *capname;
 122                int mandatory = 0;
 123                recvline(data, &buf);
 124
 125                if (!*buf.buf)
 126                        break;
 127
 128                if (*buf.buf == '*') {
 129                        capname = buf.buf + 1;
 130                        mandatory = 1;
 131                } else
 132                        capname = buf.buf;
 133
 134                if (debug)
 135                        fprintf(stderr, "Debug: Got cap %s\n", capname);
 136                if (!strcmp(capname, "fetch"))
 137                        data->fetch = 1;
 138                else if (!strcmp(capname, "option"))
 139                        data->option = 1;
 140                else if (!strcmp(capname, "push"))
 141                        data->push = 1;
 142                else if (!strcmp(capname, "import"))
 143                        data->import = 1;
 144                else if (!data->refspecs && !prefixcmp(capname, "refspec ")) {
 145                        ALLOC_GROW(refspecs,
 146                                   refspec_nr + 1,
 147                                   refspec_alloc);
 148                        refspecs[refspec_nr++] = strdup(buf.buf + strlen("refspec "));
 149                } else if (mandatory) {
 150                        die("Unknown madatory capability %s. This remote "
 151                            "helper probably needs newer version of Git.\n",
 152                            capname);
 153                }
 154        }
 155        if (refspecs) {
 156                int i;
 157                data->refspec_nr = refspec_nr;
 158                data->refspecs = parse_fetch_refspec(refspec_nr, refspecs);
 159                for (i = 0; i < refspec_nr; i++) {
 160                        free((char *)refspecs[i]);
 161                }
 162                free(refspecs);
 163        }
 164        strbuf_release(&buf);
 165        if (debug)
 166                fprintf(stderr, "Debug: Capabilities complete.\n");
 167        return data->helper;
 168}
 169
 170static int disconnect_helper(struct transport *transport)
 171{
 172        struct helper_data *data = transport->data;
 173        struct strbuf buf = STRBUF_INIT;
 174
 175        if (data->helper) {
 176                if (debug)
 177                        fprintf(stderr, "Debug: Disconnecting.\n");
 178                strbuf_addf(&buf, "\n");
 179                sendline(data, &buf);
 180                close(data->helper->in);
 181                close(data->helper->out);
 182                fclose(data->out);
 183                finish_command(data->helper);
 184                free((char *)data->helper->argv[0]);
 185                free(data->helper->argv);
 186                free(data->helper);
 187                data->helper = NULL;
 188        }
 189        return 0;
 190}
 191
 192static const char *unsupported_options[] = {
 193        TRANS_OPT_UPLOADPACK,
 194        TRANS_OPT_RECEIVEPACK,
 195        TRANS_OPT_THIN,
 196        TRANS_OPT_KEEP
 197        };
 198static const char *boolean_options[] = {
 199        TRANS_OPT_THIN,
 200        TRANS_OPT_KEEP,
 201        TRANS_OPT_FOLLOWTAGS
 202        };
 203
 204static int set_helper_option(struct transport *transport,
 205                          const char *name, const char *value)
 206{
 207        struct helper_data *data = transport->data;
 208        struct strbuf buf = STRBUF_INIT;
 209        int i, ret, is_bool = 0;
 210
 211        get_helper(transport);
 212
 213        if (!data->option)
 214                return 1;
 215
 216        for (i = 0; i < ARRAY_SIZE(unsupported_options); i++) {
 217                if (!strcmp(name, unsupported_options[i]))
 218                        return 1;
 219        }
 220
 221        for (i = 0; i < ARRAY_SIZE(boolean_options); i++) {
 222                if (!strcmp(name, boolean_options[i])) {
 223                        is_bool = 1;
 224                        break;
 225                }
 226        }
 227
 228        strbuf_addf(&buf, "option %s ", name);
 229        if (is_bool)
 230                strbuf_addstr(&buf, value ? "true" : "false");
 231        else
 232                quote_c_style(value, &buf, NULL, 0);
 233        strbuf_addch(&buf, '\n');
 234
 235        xchgline(data, &buf);
 236
 237        if (!strcmp(buf.buf, "ok"))
 238                ret = 0;
 239        else if (!prefixcmp(buf.buf, "error")) {
 240                ret = -1;
 241        } else if (!strcmp(buf.buf, "unsupported"))
 242                ret = 1;
 243        else {
 244                warning("%s unexpectedly said: '%s'", data->name, buf.buf);
 245                ret = 1;
 246        }
 247        strbuf_release(&buf);
 248        return ret;
 249}
 250
 251static void standard_options(struct transport *t)
 252{
 253        char buf[16];
 254        int n;
 255        int v = t->verbose;
 256        int no_progress = v < 0 || (!t->progress && !isatty(1));
 257
 258        set_helper_option(t, "progress", !no_progress ? "true" : "false");
 259
 260        n = snprintf(buf, sizeof(buf), "%d", v + 1);
 261        if (n >= sizeof(buf))
 262                die("impossibly large verbosity value");
 263        set_helper_option(t, "verbosity", buf);
 264}
 265
 266static int release_helper(struct transport *transport)
 267{
 268        struct helper_data *data = transport->data;
 269        free_refspec(data->refspec_nr, data->refspecs);
 270        data->refspecs = NULL;
 271        disconnect_helper(transport);
 272        free(transport->data);
 273        return 0;
 274}
 275
 276static int fetch_with_fetch(struct transport *transport,
 277                            int nr_heads, struct ref **to_fetch)
 278{
 279        struct helper_data *data = transport->data;
 280        int i;
 281        struct strbuf buf = STRBUF_INIT;
 282
 283        standard_options(transport);
 284
 285        for (i = 0; i < nr_heads; i++) {
 286                const struct ref *posn = to_fetch[i];
 287                if (posn->status & REF_STATUS_UPTODATE)
 288                        continue;
 289
 290                strbuf_addf(&buf, "fetch %s %s\n",
 291                            sha1_to_hex(posn->old_sha1), posn->name);
 292        }
 293
 294        strbuf_addch(&buf, '\n');
 295        sendline(data, &buf);
 296
 297        while (1) {
 298                recvline(data, &buf);
 299
 300                if (!prefixcmp(buf.buf, "lock ")) {
 301                        const char *name = buf.buf + 5;
 302                        if (transport->pack_lockfile)
 303                                warning("%s also locked %s", data->name, name);
 304                        else
 305                                transport->pack_lockfile = xstrdup(name);
 306                }
 307                else if (!buf.len)
 308                        break;
 309                else
 310                        warning("%s unexpectedly said: '%s'", data->name, buf.buf);
 311        }
 312        strbuf_release(&buf);
 313        return 0;
 314}
 315
 316static int get_importer(struct transport *transport, struct child_process *fastimport)
 317{
 318        struct child_process *helper = get_helper(transport);
 319        memset(fastimport, 0, sizeof(*fastimport));
 320        fastimport->in = helper->out;
 321        fastimport->argv = xcalloc(5, sizeof(*fastimport->argv));
 322        fastimport->argv[0] = "fast-import";
 323        fastimport->argv[1] = "--quiet";
 324
 325        fastimport->git_cmd = 1;
 326        return start_command(fastimport);
 327}
 328
 329static int fetch_with_import(struct transport *transport,
 330                             int nr_heads, struct ref **to_fetch)
 331{
 332        struct child_process fastimport;
 333        struct helper_data *data = transport->data;
 334        int i;
 335        struct ref *posn;
 336        struct strbuf buf = STRBUF_INIT;
 337
 338        get_helper(transport);
 339
 340        if (get_importer(transport, &fastimport))
 341                die("Couldn't run fast-import");
 342
 343        for (i = 0; i < nr_heads; i++) {
 344                posn = to_fetch[i];
 345                if (posn->status & REF_STATUS_UPTODATE)
 346                        continue;
 347
 348                strbuf_addf(&buf, "import %s\n", posn->name);
 349                sendline(data, &buf);
 350                strbuf_reset(&buf);
 351        }
 352        disconnect_helper(transport);
 353        finish_command(&fastimport);
 354        free(fastimport.argv);
 355        fastimport.argv = NULL;
 356
 357        for (i = 0; i < nr_heads; i++) {
 358                char *private;
 359                posn = to_fetch[i];
 360                if (posn->status & REF_STATUS_UPTODATE)
 361                        continue;
 362                if (data->refspecs)
 363                        private = apply_refspecs(data->refspecs, data->refspec_nr, posn->name);
 364                else
 365                        private = strdup(posn->name);
 366                read_ref(private, posn->old_sha1);
 367                free(private);
 368        }
 369        strbuf_release(&buf);
 370        return 0;
 371}
 372
 373static int fetch(struct transport *transport,
 374                 int nr_heads, struct ref **to_fetch)
 375{
 376        struct helper_data *data = transport->data;
 377        int i, count;
 378
 379        count = 0;
 380        for (i = 0; i < nr_heads; i++)
 381                if (!(to_fetch[i]->status & REF_STATUS_UPTODATE))
 382                        count++;
 383
 384        if (!count)
 385                return 0;
 386
 387        if (data->fetch)
 388                return fetch_with_fetch(transport, nr_heads, to_fetch);
 389
 390        if (data->import)
 391                return fetch_with_import(transport, nr_heads, to_fetch);
 392
 393        return -1;
 394}
 395
 396static int push_refs(struct transport *transport,
 397                struct ref *remote_refs, int flags)
 398{
 399        int force_all = flags & TRANSPORT_PUSH_FORCE;
 400        int mirror = flags & TRANSPORT_PUSH_MIRROR;
 401        struct helper_data *data = transport->data;
 402        struct strbuf buf = STRBUF_INIT;
 403        struct child_process *helper;
 404        struct ref *ref;
 405
 406        if (!remote_refs)
 407                return 0;
 408
 409        helper = get_helper(transport);
 410        if (!data->push)
 411                return 1;
 412
 413        for (ref = remote_refs; ref; ref = ref->next) {
 414                if (ref->peer_ref)
 415                        hashcpy(ref->new_sha1, ref->peer_ref->new_sha1);
 416                else if (!mirror)
 417                        continue;
 418
 419                ref->deletion = is_null_sha1(ref->new_sha1);
 420                if (!ref->deletion &&
 421                        !hashcmp(ref->old_sha1, ref->new_sha1)) {
 422                        ref->status = REF_STATUS_UPTODATE;
 423                        continue;
 424                }
 425
 426                if (force_all)
 427                        ref->force = 1;
 428
 429                strbuf_addstr(&buf, "push ");
 430                if (!ref->deletion) {
 431                        if (ref->force)
 432                                strbuf_addch(&buf, '+');
 433                        if (ref->peer_ref)
 434                                strbuf_addstr(&buf, ref->peer_ref->name);
 435                        else
 436                                strbuf_addstr(&buf, sha1_to_hex(ref->new_sha1));
 437                }
 438                strbuf_addch(&buf, ':');
 439                strbuf_addstr(&buf, ref->name);
 440                strbuf_addch(&buf, '\n');
 441        }
 442        if (buf.len == 0)
 443                return 0;
 444
 445        transport->verbose = flags & TRANSPORT_PUSH_VERBOSE ? 1 : 0;
 446        standard_options(transport);
 447
 448        if (flags & TRANSPORT_PUSH_DRY_RUN) {
 449                if (set_helper_option(transport, "dry-run", "true") != 0)
 450                        die("helper %s does not support dry-run", data->name);
 451        }
 452
 453        strbuf_addch(&buf, '\n');
 454        sendline(data, &buf);
 455
 456        ref = remote_refs;
 457        while (1) {
 458                char *refname, *msg;
 459                int status;
 460
 461                recvline(data, &buf);
 462                if (!buf.len)
 463                        break;
 464
 465                if (!prefixcmp(buf.buf, "ok ")) {
 466                        status = REF_STATUS_OK;
 467                        refname = buf.buf + 3;
 468                } else if (!prefixcmp(buf.buf, "error ")) {
 469                        status = REF_STATUS_REMOTE_REJECT;
 470                        refname = buf.buf + 6;
 471                } else
 472                        die("expected ok/error, helper said '%s'\n", buf.buf);
 473
 474                msg = strchr(refname, ' ');
 475                if (msg) {
 476                        struct strbuf msg_buf = STRBUF_INIT;
 477                        const char *end;
 478
 479                        *msg++ = '\0';
 480                        if (!unquote_c_style(&msg_buf, msg, &end))
 481                                msg = strbuf_detach(&msg_buf, NULL);
 482                        else
 483                                msg = xstrdup(msg);
 484                        strbuf_release(&msg_buf);
 485
 486                        if (!strcmp(msg, "no match")) {
 487                                status = REF_STATUS_NONE;
 488                                free(msg);
 489                                msg = NULL;
 490                        }
 491                        else if (!strcmp(msg, "up to date")) {
 492                                status = REF_STATUS_UPTODATE;
 493                                free(msg);
 494                                msg = NULL;
 495                        }
 496                        else if (!strcmp(msg, "non-fast forward")) {
 497                                status = REF_STATUS_REJECT_NONFASTFORWARD;
 498                                free(msg);
 499                                msg = NULL;
 500                        }
 501                }
 502
 503                if (ref)
 504                        ref = find_ref_by_name(ref, refname);
 505                if (!ref)
 506                        ref = find_ref_by_name(remote_refs, refname);
 507                if (!ref) {
 508                        warning("helper reported unexpected status of %s", refname);
 509                        continue;
 510                }
 511
 512                ref->status = status;
 513                ref->remote_status = msg;
 514        }
 515        strbuf_release(&buf);
 516        return 0;
 517}
 518
 519static int has_attribute(const char *attrs, const char *attr) {
 520        int len;
 521        if (!attrs)
 522                return 0;
 523
 524        len = strlen(attr);
 525        for (;;) {
 526                const char *space = strchrnul(attrs, ' ');
 527                if (len == space - attrs && !strncmp(attrs, attr, len))
 528                        return 1;
 529                if (!*space)
 530                        return 0;
 531                attrs = space + 1;
 532        }
 533}
 534
 535static struct ref *get_refs_list(struct transport *transport, int for_push)
 536{
 537        struct helper_data *data = transport->data;
 538        struct child_process *helper;
 539        struct ref *ret = NULL;
 540        struct ref **tail = &ret;
 541        struct ref *posn;
 542        struct strbuf buf = STRBUF_INIT;
 543
 544        helper = get_helper(transport);
 545
 546        if (data->push && for_push)
 547                write_str_in_full(helper->in, "list for-push\n");
 548        else
 549                write_str_in_full(helper->in, "list\n");
 550
 551        while (1) {
 552                char *eov, *eon;
 553                recvline(data, &buf);
 554
 555                if (!*buf.buf)
 556                        break;
 557
 558                eov = strchr(buf.buf, ' ');
 559                if (!eov)
 560                        die("Malformed response in ref list: %s", buf.buf);
 561                eon = strchr(eov + 1, ' ');
 562                *eov = '\0';
 563                if (eon)
 564                        *eon = '\0';
 565                *tail = alloc_ref(eov + 1);
 566                if (buf.buf[0] == '@')
 567                        (*tail)->symref = xstrdup(buf.buf + 1);
 568                else if (buf.buf[0] != '?')
 569                        get_sha1_hex(buf.buf, (*tail)->old_sha1);
 570                if (eon) {
 571                        if (has_attribute(eon + 1, "unchanged")) {
 572                                (*tail)->status |= REF_STATUS_UPTODATE;
 573                                read_ref((*tail)->name, (*tail)->old_sha1);
 574                        }
 575                }
 576                tail = &((*tail)->next);
 577        }
 578        if (debug)
 579                fprintf(stderr, "Debug: Read ref listing.\n");
 580        strbuf_release(&buf);
 581
 582        for (posn = ret; posn; posn = posn->next)
 583                resolve_remote_symref(posn, ret);
 584
 585        return ret;
 586}
 587
 588int transport_helper_init(struct transport *transport, const char *name)
 589{
 590        struct helper_data *data = xcalloc(sizeof(*data), 1);
 591        data->name = name;
 592
 593        if (getenv("GIT_TRANSPORT_HELPER_DEBUG"))
 594                debug = 1;
 595
 596        transport->data = data;
 597        transport->set_option = set_helper_option;
 598        transport->get_refs_list = get_refs_list;
 599        transport->fetch = fetch;
 600        transport->push_refs = push_refs;
 601        transport->disconnect = release_helper;
 602        transport->smart_options = &(data->transport_options);
 603        return 0;
 604}