Andrew's git / gitweb.git / connect.c
?
connect.con commit index-pack: fix compilation with NO_PTHREADS (e0e2128)
   1#include "git-compat-util.h"
   2#include "cache.h"
   3#include "pkt-line.h"
   4#include "quote.h"
   5#include "refs.h"
   6#include "run-command.h"
   7#include "remote.h"
   8#include "connect.h"
   9#include "url.h"
  10#include "string-list.h"
  11#include "sha1-array.h"
  12
  13static char *server_capabilities;
  14static const char *parse_feature_value(const char *, const char *, int *);
  15
  16static int check_ref(const char *name, unsigned int flags)
  17{
  18        if (!flags)
  19                return 1;
  20
  21        if (!skip_prefix(name, "refs/", &name))
  22                return 0;
  23
  24        /* REF_NORMAL means that we don't want the magic fake tag refs */
  25        if ((flags & REF_NORMAL) && check_refname_format(name, 0))
  26                return 0;
  27
  28        /* REF_HEADS means that we want regular branch heads */
  29        if ((flags & REF_HEADS) && starts_with(name, "heads/"))
  30                return 1;
  31
  32        /* REF_TAGS means that we want tags */
  33        if ((flags & REF_TAGS) && starts_with(name, "tags/"))
  34                return 1;
  35
  36        /* All type bits clear means that we are ok with anything */
  37        return !(flags & ~REF_NORMAL);
  38}
  39
  40int check_ref_type(const struct ref *ref, int flags)
  41{
  42        return check_ref(ref->name, flags);
  43}
  44
  45static void die_initial_contact(int got_at_least_one_head)
  46{
  47        if (got_at_least_one_head)
  48                die("The remote end hung up upon initial contact");
  49        else
  50                die("Could not read from remote repository.\n\n"
  51                    "Please make sure you have the correct access rights\n"
  52                    "and the repository exists.");
  53}
  54
  55static void parse_one_symref_info(struct string_list *symref, const char *val, int len)
  56{
  57        char *sym, *target;
  58        struct string_list_item *item;
  59
  60        if (!len)
  61                return; /* just "symref" */
  62        /* e.g. "symref=HEAD:refs/heads/master" */
  63        sym = xmemdupz(val, len);
  64        target = strchr(sym, ':');
  65        if (!target)
  66                /* just "symref=something" */
  67                goto reject;
  68        *(target++) = '\0';
  69        if (check_refname_format(sym, REFNAME_ALLOW_ONELEVEL) ||
  70            check_refname_format(target, REFNAME_ALLOW_ONELEVEL))
  71                /* "symref=bogus:pair */
  72                goto reject;
  73        item = string_list_append(symref, sym);
  74        item->util = target;
  75        return;
  76reject:
  77        free(sym);
  78        return;
  79}
  80
  81static void annotate_refs_with_symref_info(struct ref *ref)
  82{
  83        struct string_list symref = STRING_LIST_INIT_DUP;
  84        const char *feature_list = server_capabilities;
  85
  86        while (feature_list) {
  87                int len;
  88                const char *val;
  89
  90                val = parse_feature_value(feature_list, "symref", &len);
  91                if (!val)
  92                        break;
  93                parse_one_symref_info(&symref, val, len);
  94                feature_list = val + 1;
  95        }
  96        sort_string_list(&symref);
  97
  98        for (; ref; ref = ref->next) {
  99                struct string_list_item *item;
 100                item = string_list_lookup(&symref, ref->name);
 101                if (!item)
 102                        continue;
 103                ref->symref = xstrdup((char *)item->util);
 104        }
 105        string_list_clear(&symref, 0);
 106}
 107
 108/*
 109 * Read all the refs from the other end
 110 */
 111struct ref **get_remote_heads(int in, char *src_buf, size_t src_len,
 112                              struct ref **list, unsigned int flags,
 113                              struct sha1_array *extra_have,
 114                              struct sha1_array *shallow_points)
 115{
 116        struct ref **orig_list = list;
 117        int got_at_least_one_head = 0;
 118
 119        *list = NULL;
 120        for (;;) {
 121                struct ref *ref;
 122                unsigned char old_sha1[20];
 123                char *name;
 124                int len, name_len;
 125                char *buffer = packet_buffer;
 126                const char *arg;
 127
 128                len = packet_read(in, &src_buf, &src_len,
 129                                  packet_buffer, sizeof(packet_buffer),
 130                                  PACKET_READ_GENTLE_ON_EOF |
 131                                  PACKET_READ_CHOMP_NEWLINE);
 132                if (len < 0)
 133                        die_initial_contact(got_at_least_one_head);
 134
 135                if (!len)
 136                        break;
 137
 138                if (len > 4 && skip_prefix(buffer, "ERR ", &arg))
 139                        die("remote error: %s", arg);
 140
 141                if (len == 48 && skip_prefix(buffer, "shallow ", &arg)) {
 142                        if (get_sha1_hex(arg, old_sha1))
 143                                die("protocol error: expected shallow sha-1, got '%s'", arg);
 144                        if (!shallow_points)
 145                                die("repository on the other end cannot be shallow");
 146                        sha1_array_append(shallow_points, old_sha1);
 147                        continue;
 148                }
 149
 150                if (len < 42 || get_sha1_hex(buffer, old_sha1) || buffer[40] != ' ')
 151                        die("protocol error: expected sha/ref, got '%s'", buffer);
 152                name = buffer + 41;
 153
 154                name_len = strlen(name);
 155                if (len != name_len + 41) {
 156                        free(server_capabilities);
 157                        server_capabilities = xstrdup(name + name_len + 1);
 158                }
 159
 160                if (extra_have &&
 161                    name_len == 5 && !memcmp(".have", name, 5)) {
 162                        sha1_array_append(extra_have, old_sha1);
 163                        continue;
 164                }
 165
 166                if (!check_ref(name, flags))
 167                        continue;
 168                ref = alloc_ref(buffer + 41);
 169                hashcpy(ref->old_sha1, old_sha1);
 170                *list = ref;
 171                list = &ref->next;
 172                got_at_least_one_head = 1;
 173        }
 174
 175        annotate_refs_with_symref_info(*orig_list);
 176
 177        return list;
 178}
 179
 180static const char *parse_feature_value(const char *feature_list, const char *feature, int *lenp)
 181{
 182        int len;
 183
 184        if (!feature_list)
 185                return NULL;
 186
 187        len = strlen(feature);
 188        while (*feature_list) {
 189                const char *found = strstr(feature_list, feature);
 190                if (!found)
 191                        return NULL;
 192                if (feature_list == found || isspace(found[-1])) {
 193                        const char *value = found + len;
 194                        /* feature with no value (e.g., "thin-pack") */
 195                        if (!*value || isspace(*value)) {
 196                                if (lenp)
 197                                        *lenp = 0;
 198                                return value;
 199                        }
 200                        /* feature with a value (e.g., "agent=git/1.2.3") */
 201                        else if (*value == '=') {
 202                                value++;
 203                                if (lenp)
 204                                        *lenp = strcspn(value, " \t\n");
 205                                return value;
 206                        }
 207                        /*
 208                         * otherwise we matched a substring of another feature;
 209                         * keep looking
 210                         */
 211                }
 212                feature_list = found + 1;
 213        }
 214        return NULL;
 215}
 216
 217int parse_feature_request(const char *feature_list, const char *feature)
 218{
 219        return !!parse_feature_value(feature_list, feature, NULL);
 220}
 221
 222const char *server_feature_value(const char *feature, int *len)
 223{
 224        return parse_feature_value(server_capabilities, feature, len);
 225}
 226
 227int server_supports(const char *feature)
 228{
 229        return !!server_feature_value(feature, NULL);
 230}
 231
 232enum protocol {
 233        PROTO_LOCAL = 1,
 234        PROTO_FILE,
 235        PROTO_SSH,
 236        PROTO_GIT
 237};
 238
 239int url_is_local_not_ssh(const char *url)
 240{
 241        const char *colon = strchr(url, ':');
 242        const char *slash = strchr(url, '/');
 243        return !colon || (slash && slash < colon) ||
 244                has_dos_drive_prefix(url);
 245}
 246
 247static const char *prot_name(enum protocol protocol)
 248{
 249        switch (protocol) {
 250                case PROTO_LOCAL:
 251                case PROTO_FILE:
 252                        return "file";
 253                case PROTO_SSH:
 254                        return "ssh";
 255                case PROTO_GIT:
 256                        return "git";
 257                default:
 258                        return "unkown protocol";
 259        }
 260}
 261
 262static enum protocol get_protocol(const char *name)
 263{
 264        if (!strcmp(name, "ssh"))
 265                return PROTO_SSH;
 266        if (!strcmp(name, "git"))
 267                return PROTO_GIT;
 268        if (!strcmp(name, "git+ssh"))
 269                return PROTO_SSH;
 270        if (!strcmp(name, "ssh+git"))
 271                return PROTO_SSH;
 272        if (!strcmp(name, "file"))
 273                return PROTO_FILE;
 274        die("I don't handle protocol '%s'", name);
 275}
 276
 277#define STR_(s) # s
 278#define STR(s)  STR_(s)
 279
 280static void get_host_and_port(char **host, const char **port)
 281{
 282        char *colon, *end;
 283
 284        if (*host[0] == '[') {
 285                end = strchr(*host + 1, ']');
 286                if (end) {
 287                        *end = 0;
 288                        end++;
 289                        (*host)++;
 290                } else
 291                        end = *host;
 292        } else
 293                end = *host;
 294        colon = strchr(end, ':');
 295
 296        if (colon) {
 297                *colon = 0;
 298                *port = colon + 1;
 299        }
 300}
 301
 302static void enable_keepalive(int sockfd)
 303{
 304        int ka = 1;
 305
 306        if (setsockopt(sockfd, SOL_SOCKET, SO_KEEPALIVE, &ka, sizeof(ka)) < 0)
 307                fprintf(stderr, "unable to set SO_KEEPALIVE on socket: %s\n",
 308                        strerror(errno));
 309}
 310
 311#ifndef NO_IPV6
 312
 313static const char *ai_name(const struct addrinfo *ai)
 314{
 315        static char addr[NI_MAXHOST];
 316        if (getnameinfo(ai->ai_addr, ai->ai_addrlen, addr, sizeof(addr), NULL, 0,
 317                        NI_NUMERICHOST) != 0)
 318                strcpy(addr, "(unknown)");
 319
 320        return addr;
 321}
 322
 323/*
 324 * Returns a connected socket() fd, or else die()s.
 325 */
 326static int git_tcp_connect_sock(char *host, int flags)
 327{
 328        struct strbuf error_message = STRBUF_INIT;
 329        int sockfd = -1;
 330        const char *port = STR(DEFAULT_GIT_PORT);
 331        struct addrinfo hints, *ai0, *ai;
 332        int gai;
 333        int cnt = 0;
 334
 335        get_host_and_port(&host, &port);
 336        if (!*port)
 337                port = "<none>";
 338
 339        memset(&hints, 0, sizeof(hints));
 340        hints.ai_socktype = SOCK_STREAM;
 341        hints.ai_protocol = IPPROTO_TCP;
 342
 343        if (flags & CONNECT_VERBOSE)
 344                fprintf(stderr, "Looking up %s ... ", host);
 345
 346        gai = getaddrinfo(host, port, &hints, &ai);
 347        if (gai)
 348                die("Unable to look up %s (port %s) (%s)", host, port, gai_strerror(gai));
 349
 350        if (flags & CONNECT_VERBOSE)
 351                fprintf(stderr, "done.\nConnecting to %s (port %s) ... ", host, port);
 352
 353        for (ai0 = ai; ai; ai = ai->ai_next, cnt++) {
 354                sockfd = socket(ai->ai_family,
 355                                ai->ai_socktype, ai->ai_protocol);
 356                if ((sockfd < 0) ||
 357                    (connect(sockfd, ai->ai_addr, ai->ai_addrlen) < 0)) {
 358                        strbuf_addf(&error_message, "%s[%d: %s]: errno=%s\n",
 359                                    host, cnt, ai_name(ai), strerror(errno));
 360                        if (0 <= sockfd)
 361                                close(sockfd);
 362                        sockfd = -1;
 363                        continue;
 364                }
 365                if (flags & CONNECT_VERBOSE)
 366                        fprintf(stderr, "%s ", ai_name(ai));
 367                break;
 368        }
 369
 370        freeaddrinfo(ai0);
 371
 372        if (sockfd < 0)
 373                die("unable to connect to %s:\n%s", host, error_message.buf);
 374
 375        enable_keepalive(sockfd);
 376
 377        if (flags & CONNECT_VERBOSE)
 378                fprintf(stderr, "done.\n");
 379
 380        strbuf_release(&error_message);
 381
 382        return sockfd;
 383}
 384
 385#else /* NO_IPV6 */
 386
 387/*
 388 * Returns a connected socket() fd, or else die()s.
 389 */
 390static int git_tcp_connect_sock(char *host, int flags)
 391{
 392        struct strbuf error_message = STRBUF_INIT;
 393        int sockfd = -1;
 394        const char *port = STR(DEFAULT_GIT_PORT);
 395        char *ep;
 396        struct hostent *he;
 397        struct sockaddr_in sa;
 398        char **ap;
 399        unsigned int nport;
 400        int cnt;
 401
 402        get_host_and_port(&host, &port);
 403
 404        if (flags & CONNECT_VERBOSE)
 405                fprintf(stderr, "Looking up %s ... ", host);
 406
 407        he = gethostbyname(host);
 408        if (!he)
 409                die("Unable to look up %s (%s)", host, hstrerror(h_errno));
 410        nport = strtoul(port, &ep, 10);
 411        if ( ep == port || *ep ) {
 412                /* Not numeric */
 413                struct servent *se = getservbyname(port,"tcp");
 414                if ( !se )
 415                        die("Unknown port %s", port);
 416                nport = se->s_port;
 417        }
 418
 419        if (flags & CONNECT_VERBOSE)
 420                fprintf(stderr, "done.\nConnecting to %s (port %s) ... ", host, port);
 421
 422        for (cnt = 0, ap = he->h_addr_list; *ap; ap++, cnt++) {
 423                memset(&sa, 0, sizeof sa);
 424                sa.sin_family = he->h_addrtype;
 425                sa.sin_port = htons(nport);
 426                memcpy(&sa.sin_addr, *ap, he->h_length);
 427
 428                sockfd = socket(he->h_addrtype, SOCK_STREAM, 0);
 429                if ((sockfd < 0) ||
 430                    connect(sockfd, (struct sockaddr *)&sa, sizeof sa) < 0) {
 431                        strbuf_addf(&error_message, "%s[%d: %s]: errno=%s\n",
 432                                host,
 433                                cnt,
 434                                inet_ntoa(*(struct in_addr *)&sa.sin_addr),
 435                                strerror(errno));
 436                        if (0 <= sockfd)
 437                                close(sockfd);
 438                        sockfd = -1;
 439                        continue;
 440                }
 441                if (flags & CONNECT_VERBOSE)
 442                        fprintf(stderr, "%s ",
 443                                inet_ntoa(*(struct in_addr *)&sa.sin_addr));
 444                break;
 445        }
 446
 447        if (sockfd < 0)
 448                die("unable to connect to %s:\n%s", host, error_message.buf);
 449
 450        enable_keepalive(sockfd);
 451
 452        if (flags & CONNECT_VERBOSE)
 453                fprintf(stderr, "done.\n");
 454
 455        return sockfd;
 456}
 457
 458#endif /* NO_IPV6 */
 459
 460
 461static void git_tcp_connect(int fd[2], char *host, int flags)
 462{
 463        int sockfd = git_tcp_connect_sock(host, flags);
 464
 465        fd[0] = sockfd;
 466        fd[1] = dup(sockfd);
 467}
 468
 469
 470static char *git_proxy_command;
 471
 472static int git_proxy_command_options(const char *var, const char *value,
 473                void *cb)
 474{
 475        if (!strcmp(var, "core.gitproxy")) {
 476                const char *for_pos;
 477                int matchlen = -1;
 478                int hostlen;
 479                const char *rhost_name = cb;
 480                int rhost_len = strlen(rhost_name);
 481
 482                if (git_proxy_command)
 483                        return 0;
 484                if (!value)
 485                        return config_error_nonbool(var);
 486                /* [core]
 487                 * ;# matches www.kernel.org as well
 488                 * gitproxy = netcatter-1 for kernel.org
 489                 * gitproxy = netcatter-2 for sample.xz
 490                 * gitproxy = netcatter-default
 491                 */
 492                for_pos = strstr(value, " for ");
 493                if (!for_pos)
 494                        /* matches everybody */
 495                        matchlen = strlen(value);
 496                else {
 497                        hostlen = strlen(for_pos + 5);
 498                        if (rhost_len < hostlen)
 499                                matchlen = -1;
 500                        else if (!strncmp(for_pos + 5,
 501                                          rhost_name + rhost_len - hostlen,
 502                                          hostlen) &&
 503                                 ((rhost_len == hostlen) ||
 504                                  rhost_name[rhost_len - hostlen -1] == '.'))
 505                                matchlen = for_pos - value;
 506                        else
 507                                matchlen = -1;
 508                }
 509                if (0 <= matchlen) {
 510                        /* core.gitproxy = none for kernel.org */
 511                        if (matchlen == 4 &&
 512                            !memcmp(value, "none", 4))
 513                                matchlen = 0;
 514                        git_proxy_command = xmemdupz(value, matchlen);
 515                }
 516                return 0;
 517        }
 518
 519        return git_default_config(var, value, cb);
 520}
 521
 522static int git_use_proxy(const char *host)
 523{
 524        git_proxy_command = getenv("GIT_PROXY_COMMAND");
 525        git_config(git_proxy_command_options, (void*)host);
 526        return (git_proxy_command && *git_proxy_command);
 527}
 528
 529static struct child_process *git_proxy_connect(int fd[2], char *host)
 530{
 531        const char *port = STR(DEFAULT_GIT_PORT);
 532        struct child_process *proxy;
 533
 534        get_host_and_port(&host, &port);
 535
 536        proxy = xmalloc(sizeof(*proxy));
 537        child_process_init(proxy);
 538        argv_array_push(&proxy->args, git_proxy_command);
 539        argv_array_push(&proxy->args, host);
 540        argv_array_push(&proxy->args, port);
 541        proxy->in = -1;
 542        proxy->out = -1;
 543        if (start_command(proxy))
 544                die("cannot start proxy %s", git_proxy_command);
 545        fd[0] = proxy->out; /* read from proxy stdout */
 546        fd[1] = proxy->in;  /* write to proxy stdin */
 547        return proxy;
 548}
 549
 550static const char *get_port_numeric(const char *p)
 551{
 552        char *end;
 553        if (p) {
 554                long port = strtol(p + 1, &end, 10);
 555                if (end != p + 1 && *end == '\0' && 0 <= port && port < 65536) {
 556                        return p;
 557                }
 558        }
 559
 560        return NULL;
 561}
 562
 563/*
 564 * Extract protocol and relevant parts from the specified connection URL.
 565 * The caller must free() the returned strings.
 566 */
 567static enum protocol parse_connect_url(const char *url_orig, char **ret_host,
 568                                       char **ret_path)
 569{
 570        char *url;
 571        char *host, *path;
 572        char *end;
 573        int separator = '/';
 574        enum protocol protocol = PROTO_LOCAL;
 575
 576        if (is_url(url_orig))
 577                url = url_decode(url_orig);
 578        else
 579                url = xstrdup(url_orig);
 580
 581        host = strstr(url, "://");
 582        if (host) {
 583                *host = '\0';
 584                protocol = get_protocol(url);
 585                host += 3;
 586        } else {
 587                host = url;
 588                if (!url_is_local_not_ssh(url)) {
 589                        protocol = PROTO_SSH;
 590                        separator = ':';
 591                }
 592        }
 593
 594        /*
 595         * Don't do destructive transforms as protocol code does
 596         * '[]' unwrapping in get_host_and_port()
 597         */
 598        if (host[0] == '[') {
 599                end = strchr(host + 1, ']');
 600                if (end) {
 601                        end++;
 602                } else
 603                        end = host;
 604        } else
 605                end = host;
 606
 607        if (protocol == PROTO_LOCAL)
 608                path = end;
 609        else if (protocol == PROTO_FILE && has_dos_drive_prefix(end))
 610                path = end; /* "file://$(pwd)" may be "file://C:/projects/repo" */
 611        else
 612                path = strchr(end, separator);
 613
 614        if (!path || !*path)
 615                die("No path specified. See 'man git-pull' for valid url syntax");
 616
 617        /*
 618         * null-terminate hostname and point path to ~ for URL's like this:
 619         *    ssh://host.xz/~user/repo
 620         */
 621
 622        end = path; /* Need to \0 terminate host here */
 623        if (separator == ':')
 624                path++; /* path starts after ':' */
 625        if (protocol == PROTO_GIT || protocol == PROTO_SSH) {
 626                if (path[1] == '~')
 627                        path++;
 628        }
 629
 630        path = xstrdup(path);
 631        *end = '\0';
 632
 633        *ret_host = xstrdup(host);
 634        *ret_path = path;
 635        free(url);
 636        return protocol;
 637}
 638
 639static struct child_process no_fork = CHILD_PROCESS_INIT;
 640
 641/*
 642 * This returns a dummy child_process if the transport protocol does not
 643 * need fork(2), or a struct child_process object if it does.  Once done,
 644 * finish the connection with finish_connect() with the value returned from
 645 * this function (it is safe to call finish_connect() with NULL to support
 646 * the former case).
 647 *
 648 * If it returns, the connect is successful; it just dies on errors (this
 649 * will hopefully be changed in a libification effort, to return NULL when
 650 * the connection failed).
 651 */
 652struct child_process *git_connect(int fd[2], const char *url,
 653                                  const char *prog, int flags)
 654{
 655        char *hostandport, *path;
 656        struct child_process *conn = &no_fork;
 657        enum protocol protocol;
 658        struct strbuf cmd = STRBUF_INIT;
 659
 660        /* Without this we cannot rely on waitpid() to tell
 661         * what happened to our children.
 662         */
 663        signal(SIGCHLD, SIG_DFL);
 664
 665        protocol = parse_connect_url(url, &hostandport, &path);
 666        if (flags & CONNECT_DIAG_URL) {
 667                printf("Diag: url=%s\n", url ? url : "NULL");
 668                printf("Diag: protocol=%s\n", prot_name(protocol));
 669                printf("Diag: hostandport=%s\n", hostandport ? hostandport : "NULL");
 670                printf("Diag: path=%s\n", path ? path : "NULL");
 671                conn = NULL;
 672        } else if (protocol == PROTO_GIT) {
 673                /* These underlying connection commands die() if they
 674                 * cannot connect.
 675                 */
 676                char *target_host = xstrdup(hostandport);
 677                if (git_use_proxy(hostandport))
 678                        conn = git_proxy_connect(fd, hostandport);
 679                else
 680                        git_tcp_connect(fd, hostandport, flags);
 681                /*
 682                 * Separate original protocol components prog and path
 683                 * from extended host header with a NUL byte.
 684                 *
 685                 * Note: Do not add any other headers here!  Doing so
 686                 * will cause older git-daemon servers to crash.
 687                 */
 688                packet_write(fd[1],
 689                             "%s %s%chost=%s%c",
 690                             prog, path, 0,
 691                             target_host, 0);
 692                free(target_host);
 693        } else {
 694                conn = xmalloc(sizeof(*conn));
 695                child_process_init(conn);
 696
 697                strbuf_addstr(&cmd, prog);
 698                strbuf_addch(&cmd, ' ');
 699                sq_quote_buf(&cmd, path);
 700
 701                conn->in = conn->out = -1;
 702                if (protocol == PROTO_SSH) {
 703                        const char *ssh = getenv("GIT_SSH");
 704                        int putty = ssh && strcasestr(ssh, "plink");
 705                        char *ssh_host = hostandport;
 706                        const char *port = NULL;
 707                        get_host_and_port(&ssh_host, &port);
 708                        port = get_port_numeric(port);
 709
 710                        if (!ssh) ssh = "ssh";
 711
 712                        argv_array_push(&conn->args, ssh);
 713                        if (putty && !strcasestr(ssh, "tortoiseplink"))
 714                                argv_array_push(&conn->args, "-batch");
 715                        if (port) {
 716                                /* P is for PuTTY, p is for OpenSSH */
 717                                argv_array_push(&conn->args, putty ? "-P" : "-p");
 718                                argv_array_push(&conn->args, port);
 719                        }
 720                        argv_array_push(&conn->args, ssh_host);
 721                } else {
 722                        /* remove repo-local variables from the environment */
 723                        conn->env = local_repo_env;
 724                        conn->use_shell = 1;
 725                }
 726                argv_array_push(&conn->args, cmd.buf);
 727
 728                if (start_command(conn))
 729                        die("unable to fork");
 730
 731                fd[0] = conn->out; /* read from child's stdout */
 732                fd[1] = conn->in;  /* write to child's stdin */
 733                strbuf_release(&cmd);
 734        }
 735        free(hostandport);
 736        free(path);
 737        return conn;
 738}
 739
 740int git_connection_is_socket(struct child_process *conn)
 741{
 742        return conn == &no_fork;
 743}
 744
 745int finish_connect(struct child_process *conn)
 746{
 747        int code;
 748        if (!conn || git_connection_is_socket(conn))
 749                return 0;
 750
 751        code = finish_command(conn);
 752        free(conn);
 753        return code;
 754}