Andrew's git - gitweb.git/blob

8a013a723b4d81deb76baabb7615c06b0caa068c
   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
  12static char *server_capabilities;
  13static const char *parse_feature_value(const char *, const char *, int *);
  14
  15static int check_ref(const char *name, int len, unsigned int flags)
  16{
  17        if (!flags)
  18                return 1;
  19
  20        if (len < 5 || memcmp(name, "refs/", 5))
  21                return 0;
  22
  23        /* Skip the "refs/" part */
  24        name += 5;
  25        len -= 5;
  26
  27        /* REF_NORMAL means that we don't want the magic fake tag refs */
  28        if ((flags & REF_NORMAL) && check_refname_format(name, 0))
  29                return 0;
  30
  31        /* REF_HEADS means that we want regular branch heads */
  32        if ((flags & REF_HEADS) && !memcmp(name, "heads/", 6))
  33                return 1;
  34
  35        /* REF_TAGS means that we want tags */
  36        if ((flags & REF_TAGS) && !memcmp(name, "tags/", 5))
  37                return 1;
  38
  39        /* All type bits clear means that we are ok with anything */
  40        return !(flags & ~REF_NORMAL);
  41}
  42
  43int check_ref_type(const struct ref *ref, int flags)
  44{
  45        return check_ref(ref->name, strlen(ref->name), flags);
  46}
  47
  48static void add_extra_have(struct extra_have_objects *extra, unsigned char *sha1)
  49{
  50        ALLOC_GROW(extra->array, extra->nr + 1, extra->alloc);
  51        hashcpy(&(extra->array[extra->nr][0]), sha1);
  52        extra->nr++;
  53}
  54
  55static void die_initial_contact(int got_at_least_one_head)
  56{
  57        if (got_at_least_one_head)
  58                die("The remote end hung up upon initial contact");
  59        else
  60                die("Could not read from remote repository.\n\n"
  61                    "Please make sure you have the correct access rights\n"
  62                    "and the repository exists.");
  63}
  64
  65static void parse_one_symref_info(struct string_list *symref, const char *val, int len)
  66{
  67        char *sym, *target;
  68        struct string_list_item *item;
  69
  70        if (!len)
  71                return; /* just "symref" */
  72        /* e.g. "symref=HEAD:refs/heads/master" */
  73        sym = xmalloc(len + 1);
  74        memcpy(sym, val, len);
  75        sym[len] = '\0';
  76        target = strchr(sym, ':');
  77        if (!target)
  78                /* just "symref=something" */
  79                goto reject;
  80        *(target++) = '\0';
  81        if (check_refname_format(sym, REFNAME_ALLOW_ONELEVEL) ||
  82            check_refname_format(target, REFNAME_ALLOW_ONELEVEL))
  83                /* "symref=bogus:pair */
  84                goto reject;
  85        item = string_list_append(symref, sym);
  86        item->util = target;
  87        return;
  88reject:
  89        free(sym);
  90        return;
  91}
  92
  93static void annotate_refs_with_symref_info(struct ref *ref)
  94{
  95        struct string_list symref = STRING_LIST_INIT_DUP;
  96        const char *feature_list = server_capabilities;
  97
  98        while (feature_list) {
  99                int len;
 100                const char *val;
 101
 102                val = parse_feature_value(feature_list, "symref", &len);
 103                if (!val)
 104                        break;
 105                parse_one_symref_info(&symref, val, len);
 106                feature_list = val + 1;
 107        }
 108        sort_string_list(&symref);
 109
 110        for (; ref; ref = ref->next) {
 111                struct string_list_item *item;
 112                item = string_list_lookup(&symref, ref->name);
 113                if (!item)
 114                        continue;
 115                ref->symref = xstrdup((char *)item->util);
 116        }
 117        string_list_clear(&symref, 0);
 118}
 119
 120/*
 121 * Read all the refs from the other end
 122 */
 123struct ref **get_remote_heads(int in, char *src_buf, size_t src_len,
 124                              struct ref **list, unsigned int flags,
 125                              struct extra_have_objects *extra_have)
 126{
 127        struct ref **orig_list = list;
 128        int got_at_least_one_head = 0;
 129
 130        *list = NULL;
 131        for (;;) {
 132                struct ref *ref;
 133                unsigned char old_sha1[20];
 134                char *name;
 135                int len, name_len;
 136                char *buffer = packet_buffer;
 137
 138                len = packet_read(in, &src_buf, &src_len,
 139                                  packet_buffer, sizeof(packet_buffer),
 140                                  PACKET_READ_GENTLE_ON_EOF |
 141                                  PACKET_READ_CHOMP_NEWLINE);
 142                if (len < 0)
 143                        die_initial_contact(got_at_least_one_head);
 144
 145                if (!len)
 146                        break;
 147
 148                if (len > 4 && !prefixcmp(buffer, "ERR "))
 149                        die("remote error: %s", buffer + 4);
 150
 151                if (len < 42 || get_sha1_hex(buffer, old_sha1) || buffer[40] != ' ')
 152                        die("protocol error: expected sha/ref, got '%s'", buffer);
 153                name = buffer + 41;
 154
 155                name_len = strlen(name);
 156                if (len != name_len + 41) {
 157                        free(server_capabilities);
 158                        server_capabilities = xstrdup(name + name_len + 1);
 159                }
 160
 161                if (extra_have &&
 162                    name_len == 5 && !memcmp(".have", name, 5)) {
 163                        add_extra_have(extra_have, old_sha1);
 164                        continue;
 165                }
 166
 167                if (!check_ref(name, name_len, flags))
 168                        continue;
 169                ref = alloc_ref(buffer + 41);
 170                hashcpy(ref->old_sha1, old_sha1);
 171                *list = ref;
 172                list = &ref->next;
 173                got_at_least_one_head = 1;
 174        }
 175
 176        annotate_refs_with_symref_info(*orig_list);
 177
 178        return list;
 179}
 180
 181static const char *parse_feature_value(const char *feature_list, const char *feature, int *lenp)
 182{
 183        int len;
 184
 185        if (!feature_list)
 186                return NULL;
 187
 188        len = strlen(feature);
 189        while (*feature_list) {
 190                const char *found = strstr(feature_list, feature);
 191                if (!found)
 192                        return NULL;
 193                if (feature_list == found || isspace(found[-1])) {
 194                        const char *value = found + len;
 195                        /* feature with no value (e.g., "thin-pack") */
 196                        if (!*value || isspace(*value)) {
 197                                if (lenp)
 198                                        *lenp = 0;
 199                                return value;
 200                        }
 201                        /* feature with a value (e.g., "agent=git/1.2.3") */
 202                        else if (*value == '=') {
 203                                value++;
 204                                if (lenp)
 205                                        *lenp = strcspn(value, " \t\n");
 206                                return value;
 207                        }
 208                        /*
 209                         * otherwise we matched a substring of another feature;
 210                         * keep looking
 211                         */
 212                }
 213                feature_list = found + 1;
 214        }
 215        return NULL;
 216}
 217
 218int parse_feature_request(const char *feature_list, const char *feature)
 219{
 220        return !!parse_feature_value(feature_list, feature, NULL);
 221}
 222
 223const char *server_feature_value(const char *feature, int *len)
 224{
 225        return parse_feature_value(server_capabilities, feature, len);
 226}
 227
 228int server_supports(const char *feature)
 229{
 230        return !!server_feature_value(feature, NULL);
 231}
 232
 233enum protocol {
 234        PROTO_LOCAL = 1,
 235        PROTO_FILE,
 236        PROTO_SSH,
 237        PROTO_GIT
 238};
 239
 240int url_is_local_not_ssh(const char *url)
 241{
 242        const char *colon = strchr(url, ':');
 243        const char *slash = strchr(url, '/');
 244        return !colon || (slash && slash < colon) ||
 245                has_dos_drive_prefix(url);
 246}
 247
 248static const char *prot_name(enum protocol protocol)
 249{
 250        switch (protocol) {
 251                case PROTO_LOCAL:
 252                case PROTO_FILE:
 253                        return "file";
 254                case PROTO_SSH:
 255                        return "ssh";
 256                case PROTO_GIT:
 257                        return "git";
 258                default:
 259                        return "unkown protocol";
 260        }
 261}
 262
 263static enum protocol get_protocol(const char *name)
 264{
 265        if (!strcmp(name, "ssh"))
 266                return PROTO_SSH;
 267        if (!strcmp(name, "git"))
 268                return PROTO_GIT;
 269        if (!strcmp(name, "git+ssh"))
 270                return PROTO_SSH;
 271        if (!strcmp(name, "ssh+git"))
 272                return PROTO_SSH;
 273        if (!strcmp(name, "file"))
 274                return PROTO_FILE;
 275        die("I don't handle protocol '%s'", name);
 276}
 277
 278#define STR_(s) # s
 279#define STR(s)  STR_(s)
 280
 281static void get_host_and_port(char **host, const char **port)
 282{
 283        char *colon, *end;
 284
 285        if (*host[0] == '[') {
 286                end = strchr(*host + 1, ']');
 287                if (end) {
 288                        *end = 0;
 289                        end++;
 290                        (*host)++;
 291                } else
 292                        end = *host;
 293        } else
 294                end = *host;
 295        colon = strchr(end, ':');
 296
 297        if (colon) {
 298                *colon = 0;
 299                *port = colon + 1;
 300        }
 301}
 302
 303static void enable_keepalive(int sockfd)
 304{
 305        int ka = 1;
 306
 307        if (setsockopt(sockfd, SOL_SOCKET, SO_KEEPALIVE, &ka, sizeof(ka)) < 0)
 308                fprintf(stderr, "unable to set SO_KEEPALIVE on socket: %s\n",
 309                        strerror(errno));
 310}
 311
 312#ifndef NO_IPV6
 313
 314static const char *ai_name(const struct addrinfo *ai)
 315{
 316        static char addr[NI_MAXHOST];
 317        if (getnameinfo(ai->ai_addr, ai->ai_addrlen, addr, sizeof(addr), NULL, 0,
 318                        NI_NUMERICHOST) != 0)
 319                strcpy(addr, "(unknown)");
 320
 321        return addr;
 322}
 323
 324/*
 325 * Returns a connected socket() fd, or else die()s.
 326 */
 327static int git_tcp_connect_sock(char *host, int flags)
 328{
 329        struct strbuf error_message = STRBUF_INIT;
 330        int sockfd = -1;
 331        const char *port = STR(DEFAULT_GIT_PORT);
 332        struct addrinfo hints, *ai0, *ai;
 333        int gai;
 334        int cnt = 0;
 335
 336        get_host_and_port(&host, &port);
 337        if (!*port)
 338                port = "<none>";
 339
 340        memset(&hints, 0, sizeof(hints));
 341        hints.ai_socktype = SOCK_STREAM;
 342        hints.ai_protocol = IPPROTO_TCP;
 343
 344        if (flags & CONNECT_VERBOSE)
 345                fprintf(stderr, "Looking up %s ... ", host);
 346
 347        gai = getaddrinfo(host, port, &hints, &ai);
 348        if (gai)
 349                die("Unable to look up %s (port %s) (%s)", host, port, gai_strerror(gai));
 350
 351        if (flags & CONNECT_VERBOSE)
 352                fprintf(stderr, "done.\nConnecting to %s (port %s) ... ", host, port);
 353
 354        for (ai0 = ai; ai; ai = ai->ai_next, cnt++) {
 355                sockfd = socket(ai->ai_family,
 356                                ai->ai_socktype, ai->ai_protocol);
 357                if ((sockfd < 0) ||
 358                    (connect(sockfd, ai->ai_addr, ai->ai_addrlen) < 0)) {
 359                        strbuf_addf(&error_message, "%s[%d: %s]: errno=%s\n",
 360                                    host, cnt, ai_name(ai), strerror(errno));
 361                        if (0 <= sockfd)
 362                                close(sockfd);
 363                        sockfd = -1;
 364                        continue;
 365                }
 366                if (flags & CONNECT_VERBOSE)
 367                        fprintf(stderr, "%s ", ai_name(ai));
 368                break;
 369        }
 370
 371        freeaddrinfo(ai0);
 372
 373        if (sockfd < 0)
 374                die("unable to connect to %s:\n%s", host, error_message.buf);
 375
 376        enable_keepalive(sockfd);
 377
 378        if (flags & CONNECT_VERBOSE)
 379                fprintf(stderr, "done.\n");
 380
 381        strbuf_release(&error_message);
 382
 383        return sockfd;
 384}
 385
 386#else /* NO_IPV6 */
 387
 388/*
 389 * Returns a connected socket() fd, or else die()s.
 390 */
 391static int git_tcp_connect_sock(char *host, int flags)
 392{
 393        struct strbuf error_message = STRBUF_INIT;
 394        int sockfd = -1;
 395        const char *port = STR(DEFAULT_GIT_PORT);
 396        char *ep;
 397        struct hostent *he;
 398        struct sockaddr_in sa;
 399        char **ap;
 400        unsigned int nport;
 401        int cnt;
 402
 403        get_host_and_port(&host, &port);
 404
 405        if (flags & CONNECT_VERBOSE)
 406                fprintf(stderr, "Looking up %s ... ", host);
 407
 408        he = gethostbyname(host);
 409        if (!he)
 410                die("Unable to look up %s (%s)", host, hstrerror(h_errno));
 411        nport = strtoul(port, &ep, 10);
 412        if ( ep == port || *ep ) {
 413                /* Not numeric */
 414                struct servent *se = getservbyname(port,"tcp");
 415                if ( !se )
 416                        die("Unknown port %s", port);
 417                nport = se->s_port;
 418        }
 419
 420        if (flags & CONNECT_VERBOSE)
 421                fprintf(stderr, "done.\nConnecting to %s (port %s) ... ", host, port);
 422
 423        for (cnt = 0, ap = he->h_addr_list; *ap; ap++, cnt++) {
 424                memset(&sa, 0, sizeof sa);
 425                sa.sin_family = he->h_addrtype;
 426                sa.sin_port = htons(nport);
 427                memcpy(&sa.sin_addr, *ap, he->h_length);
 428
 429                sockfd = socket(he->h_addrtype, SOCK_STREAM, 0);
 430                if ((sockfd < 0) ||
 431                    connect(sockfd, (struct sockaddr *)&sa, sizeof sa) < 0) {
 432                        strbuf_addf(&error_message, "%s[%d: %s]: errno=%s\n",
 433                                host,
 434                                cnt,
 435                                inet_ntoa(*(struct in_addr *)&sa.sin_addr),
 436                                strerror(errno));
 437                        if (0 <= sockfd)
 438                                close(sockfd);
 439                        sockfd = -1;
 440                        continue;
 441                }
 442                if (flags & CONNECT_VERBOSE)
 443                        fprintf(stderr, "%s ",
 444                                inet_ntoa(*(struct in_addr *)&sa.sin_addr));
 445                break;
 446        }
 447
 448        if (sockfd < 0)
 449                die("unable to connect to %s:\n%s", host, error_message.buf);
 450
 451        enable_keepalive(sockfd);
 452
 453        if (flags & CONNECT_VERBOSE)
 454                fprintf(stderr, "done.\n");
 455
 456        return sockfd;
 457}
 458
 459#endif /* NO_IPV6 */
 460
 461
 462static void git_tcp_connect(int fd[2], char *host, int flags)
 463{
 464        int sockfd = git_tcp_connect_sock(host, flags);
 465
 466        fd[0] = sockfd;
 467        fd[1] = dup(sockfd);
 468}
 469
 470
 471static char *git_proxy_command;
 472
 473static int git_proxy_command_options(const char *var, const char *value,
 474                void *cb)
 475{
 476        if (!strcmp(var, "core.gitproxy")) {
 477                const char *for_pos;
 478                int matchlen = -1;
 479                int hostlen;
 480                const char *rhost_name = cb;
 481                int rhost_len = strlen(rhost_name);
 482
 483                if (git_proxy_command)
 484                        return 0;
 485                if (!value)
 486                        return config_error_nonbool(var);
 487                /* [core]
 488                 * ;# matches www.kernel.org as well
 489                 * gitproxy = netcatter-1 for kernel.org
 490                 * gitproxy = netcatter-2 for sample.xz
 491                 * gitproxy = netcatter-default
 492                 */
 493                for_pos = strstr(value, " for ");
 494                if (!for_pos)
 495                        /* matches everybody */
 496                        matchlen = strlen(value);
 497                else {
 498                        hostlen = strlen(for_pos + 5);
 499                        if (rhost_len < hostlen)
 500                                matchlen = -1;
 501                        else if (!strncmp(for_pos + 5,
 502                                          rhost_name + rhost_len - hostlen,
 503                                          hostlen) &&
 504                                 ((rhost_len == hostlen) ||
 505                                  rhost_name[rhost_len - hostlen -1] == '.'))
 506                                matchlen = for_pos - value;
 507                        else
 508                                matchlen = -1;
 509                }
 510                if (0 <= matchlen) {
 511                        /* core.gitproxy = none for kernel.org */
 512                        if (matchlen == 4 &&
 513                            !memcmp(value, "none", 4))
 514                                matchlen = 0;
 515                        git_proxy_command = xmemdupz(value, matchlen);
 516                }
 517                return 0;
 518        }
 519
 520        return git_default_config(var, value, cb);
 521}
 522
 523static int git_use_proxy(const char *host)
 524{
 525        git_proxy_command = getenv("GIT_PROXY_COMMAND");
 526        git_config(git_proxy_command_options, (void*)host);
 527        return (git_proxy_command && *git_proxy_command);
 528}
 529
 530static struct child_process *git_proxy_connect(int fd[2], char *host)
 531{
 532        const char *port = STR(DEFAULT_GIT_PORT);
 533        const char **argv;
 534        struct child_process *proxy;
 535
 536        get_host_and_port(&host, &port);
 537
 538        argv = xmalloc(sizeof(*argv) * 4);
 539        argv[0] = git_proxy_command;
 540        argv[1] = host;
 541        argv[2] = port;
 542        argv[3] = NULL;
 543        proxy = xcalloc(1, sizeof(*proxy));
 544        proxy->argv = argv;
 545        proxy->in = -1;
 546        proxy->out = -1;
 547        if (start_command(proxy))
 548                die("cannot start proxy %s", argv[0]);
 549        fd[0] = proxy->out; /* read from proxy stdout */
 550        fd[1] = proxy->in;  /* write to proxy stdin */
 551        return proxy;
 552}
 553
 554static const char *get_port_numeric(const char *p)
 555{
 556        char *end;
 557        if (p) {
 558                long port = strtol(p + 1, &end, 10);
 559                if (end != p + 1 && *end == '\0' && 0 <= port && port < 65536) {
 560                        return p;
 561                }
 562        }
 563
 564        return NULL;
 565}
 566
 567/*
 568 * Extract protocol and relevant parts from the specified connection URL.
 569 * The caller must free() the returned strings.
 570 */
 571static enum protocol parse_connect_url(const char *url_orig, char **ret_host,
 572                                       char **ret_path)
 573{
 574        char *url;
 575        char *host, *path;
 576        char *end;
 577        int separator = '/';
 578        enum protocol protocol = PROTO_LOCAL;
 579
 580        if (is_url(url_orig))
 581                url = url_decode(url_orig);
 582        else
 583                url = xstrdup(url_orig);
 584
 585        host = strstr(url, "://");
 586        if (host) {
 587                *host = '\0';
 588                protocol = get_protocol(url);
 589                host += 3;
 590        } else {
 591                host = url;
 592                if (!url_is_local_not_ssh(url)) {
 593                        protocol = PROTO_SSH;
 594                        separator = ':';
 595                }
 596        }
 597
 598        /*
 599         * Don't do destructive transforms as protocol code does
 600         * '[]' unwrapping in get_host_and_port()
 601         */
 602        if (host[0] == '[') {
 603                end = strchr(host + 1, ']');
 604                if (end) {
 605                        end++;
 606                } else
 607                        end = host;
 608        } else
 609                end = host;
 610
 611        if (protocol == PROTO_LOCAL)
 612                path = end;
 613        else if (protocol == PROTO_FILE && has_dos_drive_prefix(end))
 614                path = end; /* "file://$(pwd)" may be "file://C:/projects/repo" */
 615        else
 616                path = strchr(end, separator);
 617
 618        if (!path || !*path)
 619                die("No path specified. See 'man git-pull' for valid url syntax");
 620
 621        /*
 622         * null-terminate hostname and point path to ~ for URL's like this:
 623         *    ssh://host.xz/~user/repo
 624         */
 625
 626        end = path; /* Need to \0 terminate host here */
 627        if (separator == ':')
 628                path++; /* path starts after ':' */
 629        if (protocol == PROTO_GIT || protocol == PROTO_SSH) {
 630                if (path[1] == '~')
 631                        path++;
 632        }
 633
 634        path = xstrdup(path);
 635        *end = '\0';
 636
 637        *ret_host = xstrdup(host);
 638        *ret_path = path;
 639        free(url);
 640        return protocol;
 641}
 642
 643static struct child_process no_fork;
 644
 645/*
 646 * This returns a dummy child_process if the transport protocol does not
 647 * need fork(2), or a struct child_process object if it does.  Once done,
 648 * finish the connection with finish_connect() with the value returned from
 649 * this function (it is safe to call finish_connect() with NULL to support
 650 * the former case).
 651 *
 652 * If it returns, the connect is successful; it just dies on errors (this
 653 * will hopefully be changed in a libification effort, to return NULL when
 654 * the connection failed).
 655 */
 656struct child_process *git_connect(int fd[2], const char *url,
 657                                  const char *prog, int flags)
 658{
 659        char *hostandport, *path;
 660        struct child_process *conn = &no_fork;
 661        enum protocol protocol;
 662        const char **arg;
 663        struct strbuf cmd = STRBUF_INIT;
 664
 665        /* Without this we cannot rely on waitpid() to tell
 666         * what happened to our children.
 667         */
 668        signal(SIGCHLD, SIG_DFL);
 669
 670        protocol = parse_connect_url(url, &hostandport, &path);
 671        if (flags & CONNECT_DIAG_URL) {
 672                printf("Diag: url=%s\n", url ? url : "NULL");
 673                printf("Diag: protocol=%s\n", prot_name(protocol));
 674                printf("Diag: hostandport=%s\n", hostandport ? hostandport : "NULL");
 675                printf("Diag: path=%s\n", path ? path : "NULL");
 676                conn = NULL;
 677        } else if (protocol == PROTO_GIT) {
 678                /* These underlying connection commands die() if they
 679                 * cannot connect.
 680                 */
 681                char *target_host = xstrdup(hostandport);
 682                if (git_use_proxy(hostandport))
 683                        conn = git_proxy_connect(fd, hostandport);
 684                else
 685                        git_tcp_connect(fd, hostandport, flags);
 686                /*
 687                 * Separate original protocol components prog and path
 688                 * from extended host header with a NUL byte.
 689                 *
 690                 * Note: Do not add any other headers here!  Doing so
 691                 * will cause older git-daemon servers to crash.
 692                 */
 693                packet_write(fd[1],
 694                             "%s %s%chost=%s%c",
 695                             prog, path, 0,
 696                             target_host, 0);
 697                free(target_host);
 698        } else {
 699                conn = xcalloc(1, sizeof(*conn));
 700
 701                strbuf_addstr(&cmd, prog);
 702                strbuf_addch(&cmd, ' ');
 703                sq_quote_buf(&cmd, path);
 704
 705                conn->in = conn->out = -1;
 706                conn->argv = arg = xcalloc(7, sizeof(*arg));
 707                if (protocol == PROTO_SSH) {
 708                        const char *ssh = getenv("GIT_SSH");
 709                        int putty = ssh && strcasestr(ssh, "plink");
 710                        char *ssh_host = hostandport;
 711                        const char *port = NULL;
 712                        get_host_and_port(&ssh_host, &port);
 713                        port = get_port_numeric(port);
 714
 715                        if (!ssh) ssh = "ssh";
 716
 717                        *arg++ = ssh;
 718                        if (putty && !strcasestr(ssh, "tortoiseplink"))
 719                                *arg++ = "-batch";
 720                        if (port) {
 721                                /* P is for PuTTY, p is for OpenSSH */
 722                                *arg++ = putty ? "-P" : "-p";
 723                                *arg++ = port;
 724                        }
 725                        *arg++ = ssh_host;
 726                }       else {
 727                        /* remove repo-local variables from the environment */
 728                        conn->env = local_repo_env;
 729                        conn->use_shell = 1;
 730                }
 731                *arg++ = cmd.buf;
 732                *arg = NULL;
 733
 734                if (start_command(conn))
 735                        die("unable to fork");
 736
 737                fd[0] = conn->out; /* read from child's stdout */
 738                fd[1] = conn->in;  /* write to child's stdin */
 739                strbuf_release(&cmd);
 740        }
 741        free(hostandport);
 742        free(path);
 743        return conn;
 744}
 745
 746int git_connection_is_socket(struct child_process *conn)
 747{
 748        return conn == &no_fork;
 749}
 750
 751int finish_connect(struct child_process *conn)
 752{
 753        int code;
 754        if (!conn || git_connection_is_socket(conn))
 755                return 0;
 756
 757        code = finish_command(conn);
 758        free(conn->argv);
 759        free(conn);
 760        return code;
 761}