connect.c

   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
  13 static char *server_capabilities;
  14 static const char *parse_feature_value(const char *, const char *, int *);
  15
  16 static int check_ref(const char *name, int len, unsigned int flags)
  17 {
  18         if (!flags)
  19                 return 1;
  20
  21         if (len < 5 || memcmp(name, "refs/", 5))
  22                 return 0;
  23
  24         /* Skip the "refs/" part */
  25         name += 5;
  26         len -= 5;
  27
  28         /* REF_NORMAL means that we don't want the magic fake tag refs */
  29         if ((flags & REF_NORMAL) && check_refname_format(name, 0))
  30                 return 0;
  31
  32         /* REF_HEADS means that we want regular branch heads */
  33         if ((flags & REF_HEADS) && !memcmp(name, "heads/", 6))
  34                 return 1;
  35
  36         /* REF_TAGS means that we want tags */
  37         if ((flags & REF_TAGS) && !memcmp(name, "tags/", 5))
  38                 return 1;
  39
  40         /* All type bits clear means that we are ok with anything */
  41         return !(flags & ~REF_NORMAL);
  42 }
  43
  44 int check_ref_type(const struct ref *ref, int flags)
  45 {
  46         return check_ref(ref->name, strlen(ref->name), flags);
  47 }
  48
  49 static void die_initial_contact(int got_at_least_one_head)
  50 {
  51         if (got_at_least_one_head)
  52                 die("The remote end hung up upon initial contact");
  53         else
  54                 die("Could not read from remote repository.\n\n"
  55                     "Please make sure you have the correct access rights\n"
  56                     "and the repository exists.");
  57 }
  58
  59 static void parse_one_symref_info(struct string_list *symref, const char *val, int len)
  60 {
  61         char *sym, *target;
  62         struct string_list_item *item;
  63
  64         if (!len)
  65                 return; /* just "symref" */
  66         /* e.g. "symref=HEAD:refs/heads/master" */
  67         sym = xmalloc(len + 1);
  68         memcpy(sym, val, len);
  69         sym[len] = '\0';
  70         target = strchr(sym, ':');
  71         if (!target)
  72                 /* just "symref=something" */
  73                 goto reject;
  74         *(target++) = '\0';
  75         if (check_refname_format(sym, REFNAME_ALLOW_ONELEVEL) ||
  76             check_refname_format(target, REFNAME_ALLOW_ONELEVEL))
  77                 /* "symref=bogus:pair */
  78                 goto reject;
  79         item = string_list_append(symref, sym);
  80         item->util = target;
  81         return;
  82 reject:
  83         free(sym);
  84         return;
  85 }
  86
  87 static void annotate_refs_with_symref_info(struct ref *ref)
  88 {
  89         struct string_list symref = STRING_LIST_INIT_DUP;
  90         const char *feature_list = server_capabilities;
  91
  92         while (feature_list) {
  93                 int len;
  94                 const char *val;
  95
  96                 val = parse_feature_value(feature_list, "symref", &len);
  97                 if (!val)
  98                         break;
  99                 parse_one_symref_info(&symref, val, len);
 100                 feature_list = val + 1;
 101         }
 102         sort_string_list(&symref);
 103
 104         for (; ref; ref = ref->next) {
 105                 struct string_list_item *item;
 106                 item = string_list_lookup(&symref, ref->name);
 107                 if (!item)
 108                         continue;
 109                 ref->symref = xstrdup((char *)item->util);
 110         }
 111         string_list_clear(&symref, 0);
 112 }
 113
 114 /*
 115  * Read all the refs from the other end
 116  */
 117 struct ref **get_remote_heads(int in, char *src_buf, size_t src_len,
 118                               struct ref **list, unsigned int flags,
 119                               struct sha1_array *extra_have,
 120                               struct sha1_array *shallow_points)
 121 {
 122         struct ref **orig_list = list;
 123         int got_at_least_one_head = 0;
 124
 125         *list = NULL;
 126         for (;;) {
 127                 struct ref *ref;
 128                 unsigned char old_sha1[20];
 129                 char *name;
 130                 int len, name_len;
 131                 char *buffer = packet_buffer;
 132
 133                 len = packet_read(in, &src_buf, &src_len,
 134                                   packet_buffer, sizeof(packet_buffer),
 135                                   PACKET_READ_GENTLE_ON_EOF |
 136                                   PACKET_READ_CHOMP_NEWLINE);
 137                 if (len < 0)
 138                         die_initial_contact(got_at_least_one_head);
 139
 140                 if (!len)
 141                         break;
 142
 143                 if (len > 4 && !prefixcmp(buffer, "ERR "))
 144                         die("remote error: %s", buffer + 4);
 145
 146                 if (len == 48 && !prefixcmp(buffer, "shallow ")) {
 147                         if (get_sha1_hex(buffer + 8, old_sha1))
 148                                 die("protocol error: expected shallow sha-1, got '%s'", buffer + 8);
 149                         if (!shallow_points)
 150                                 die("repository on the other end cannot be shallow");
 151                         sha1_array_append(shallow_points, old_sha1);
 152                         continue;
 153                 }
 154
 155                 if (len < 42 || get_sha1_hex(buffer, old_sha1) || buffer[40] != ' ')
 156                         die("protocol error: expected sha/ref, got '%s'", buffer);
 157                 name = buffer + 41;
 158
 159                 name_len = strlen(name);
 160                 if (len != name_len + 41) {
 161                         free(server_capabilities);
 162                         server_capabilities = xstrdup(name + name_len + 1);
 163                 }
 164
 165                 if (extra_have &&
 166                     name_len == 5 && !memcmp(".have", name, 5)) {
 167                         sha1_array_append(extra_have, old_sha1);
 168                         continue;
 169                 }
 170
 171                 if (!check_ref(name, name_len, flags))
 172                         continue;
 173                 ref = alloc_ref(buffer + 41);
 174                 hashcpy(ref->old_sha1, old_sha1);
 175                 *list = ref;
 176                 list = &ref->next;
 177                 got_at_least_one_head = 1;
 178         }
 179
 180         annotate_refs_with_symref_info(*orig_list);
 181
 182         return list;
 183 }
 184
 185 static const char *parse_feature_value(const char *feature_list, const char *feature, int *lenp)
 186 {
 187         int len;
 188
 189         if (!feature_list)
 190                 return NULL;
 191
 192         len = strlen(feature);
 193         while (*feature_list) {
 194                 const char *found = strstr(feature_list, feature);
 195                 if (!found)
 196                         return NULL;
 197                 if (feature_list == found || isspace(found[-1])) {
 198                         const char *value = found + len;
 199                         /* feature with no value (e.g., "thin-pack") */
 200                         if (!*value || isspace(*value)) {
 201                                 if (lenp)
 202                                         *lenp = 0;
 203                                 return value;
 204                         }
 205                         /* feature with a value (e.g., "agent=git/1.2.3") */
 206                         else if (*value == '=') {
 207                                 value++;
 208                                 if (lenp)
 209                                         *lenp = strcspn(value, " \t\n");
 210                                 return value;
 211                         }
 212                         /*
 213                          * otherwise we matched a substring of another feature;
 214                          * keep looking
 215                          */
 216                 }
 217                 feature_list = found + 1;
 218         }
 219         return NULL;
 220 }
 221
 222 int parse_feature_request(const char *feature_list, const char *feature)
 223 {
 224         return !!parse_feature_value(feature_list, feature, NULL);
 225 }
 226
 227 const char *server_feature_value(const char *feature, int *len)
 228 {
 229         return parse_feature_value(server_capabilities, feature, len);
 230 }
 231
 232 int server_supports(const char *feature)
 233 {
 234         return !!server_feature_value(feature, NULL);
 235 }
 236
 237 enum protocol {
 238         PROTO_LOCAL = 1,
 239         PROTO_SSH,
 240         PROTO_GIT
 241 };
 242
 243 static enum protocol get_protocol(const char *name)
 244 {
 245         if (!strcmp(name, "ssh"))
 246                 return PROTO_SSH;
 247         if (!strcmp(name, "git"))
 248                 return PROTO_GIT;
 249         if (!strcmp(name, "git+ssh"))
 250                 return PROTO_SSH;
 251         if (!strcmp(name, "ssh+git"))
 252                 return PROTO_SSH;
 253         if (!strcmp(name, "file"))
 254                 return PROTO_LOCAL;
 255         die("I don't handle protocol '%s'", name);
 256 }
 257
 258 #define STR_(s) # s
 259 #define STR(s)  STR_(s)
 260
 261 static void get_host_and_port(char **host, const char **port)
 262 {
 263         char *colon, *end;
 264
 265         if (*host[0] == '[') {
 266                 end = strchr(*host + 1, ']');
 267                 if (end) {
 268                         *end = 0;
 269                         end++;
 270                         (*host)++;
 271                 } else
 272                         end = *host;
 273         } else
 274                 end = *host;
 275         colon = strchr(end, ':');
 276
 277         if (colon) {
 278                 *colon = 0;
 279                 *port = colon + 1;
 280         }
 281 }
 282
 283 static void enable_keepalive(int sockfd)
 284 {
 285         int ka = 1;
 286
 287         if (setsockopt(sockfd, SOL_SOCKET, SO_KEEPALIVE, &ka, sizeof(ka)) < 0)
 288                 fprintf(stderr, "unable to set SO_KEEPALIVE on socket: %s\n",
 289                         strerror(errno));
 290 }
 291
 292 #ifndef NO_IPV6
 293
 294 static const char *ai_name(const struct addrinfo *ai)
 295 {
 296         static char addr[NI_MAXHOST];
 297         if (getnameinfo(ai->ai_addr, ai->ai_addrlen, addr, sizeof(addr), NULL, 0,
 298                         NI_NUMERICHOST) != 0)
 299                 strcpy(addr, "(unknown)");
 300
 301         return addr;
 302 }
 303
 304 /*
 305  * Returns a connected socket() fd, or else die()s.
 306  */
 307 static int git_tcp_connect_sock(char *host, int flags)
 308 {
 309         struct strbuf error_message = STRBUF_INIT;
 310         int sockfd = -1;
 311         const char *port = STR(DEFAULT_GIT_PORT);
 312         struct addrinfo hints, *ai0, *ai;
 313         int gai;
 314         int cnt = 0;
 315
 316         get_host_and_port(&host, &port);
 317         if (!*port)
 318                 port = "<none>";
 319
 320         memset(&hints, 0, sizeof(hints));
 321         hints.ai_socktype = SOCK_STREAM;
 322         hints.ai_protocol = IPPROTO_TCP;
 323
 324         if (flags & CONNECT_VERBOSE)
 325                 fprintf(stderr, "Looking up %s ... ", host);
 326
 327         gai = getaddrinfo(host, port, &hints, &ai);
 328         if (gai)
 329                 die("Unable to look up %s (port %s) (%s)", host, port, gai_strerror(gai));
 330
 331         if (flags & CONNECT_VERBOSE)
 332                 fprintf(stderr, "done.\nConnecting to %s (port %s) ... ", host, port);
 333
 334         for (ai0 = ai; ai; ai = ai->ai_next, cnt++) {
 335                 sockfd = socket(ai->ai_family,
 336                                 ai->ai_socktype, ai->ai_protocol);
 337                 if ((sockfd < 0) ||
 338                     (connect(sockfd, ai->ai_addr, ai->ai_addrlen) < 0)) {
 339                         strbuf_addf(&error_message, "%s[%d: %s]: errno=%s\n",
 340                                     host, cnt, ai_name(ai), strerror(errno));
 341                         if (0 <= sockfd)
 342                                 close(sockfd);
 343                         sockfd = -1;
 344                         continue;
 345                 }
 346                 if (flags & CONNECT_VERBOSE)
 347                         fprintf(stderr, "%s ", ai_name(ai));
 348                 break;
 349         }
 350
 351         freeaddrinfo(ai0);
 352
 353         if (sockfd < 0)
 354                 die("unable to connect to %s:\n%s", host, error_message.buf);
 355
 356         enable_keepalive(sockfd);
 357
 358         if (flags & CONNECT_VERBOSE)
 359                 fprintf(stderr, "done.\n");
 360
 361         strbuf_release(&error_message);
 362
 363         return sockfd;
 364 }
 365
 366 #else /* NO_IPV6 */
 367
 368 /*
 369  * Returns a connected socket() fd, or else die()s.
 370  */
 371 static int git_tcp_connect_sock(char *host, int flags)
 372 {
 373         struct strbuf error_message = STRBUF_INIT;
 374         int sockfd = -1;
 375         const char *port = STR(DEFAULT_GIT_PORT);
 376         char *ep;
 377         struct hostent *he;
 378         struct sockaddr_in sa;
 379         char **ap;
 380         unsigned int nport;
 381         int cnt;
 382
 383         get_host_and_port(&host, &port);
 384
 385         if (flags & CONNECT_VERBOSE)
 386                 fprintf(stderr, "Looking up %s ... ", host);
 387
 388         he = gethostbyname(host);
 389         if (!he)
 390                 die("Unable to look up %s (%s)", host, hstrerror(h_errno));
 391         nport = strtoul(port, &ep, 10);
 392         if ( ep == port || *ep ) {
 393                 /* Not numeric */
 394                 struct servent *se = getservbyname(port,"tcp");
 395                 if ( !se )
 396                         die("Unknown port %s", port);
 397                 nport = se->s_port;
 398         }
 399
 400         if (flags & CONNECT_VERBOSE)
 401                 fprintf(stderr, "done.\nConnecting to %s (port %s) ... ", host, port);
 402
 403         for (cnt = 0, ap = he->h_addr_list; *ap; ap++, cnt++) {
 404                 memset(&sa, 0, sizeof sa);
 405                 sa.sin_family = he->h_addrtype;
 406                 sa.sin_port = htons(nport);
 407                 memcpy(&sa.sin_addr, *ap, he->h_length);
 408
 409                 sockfd = socket(he->h_addrtype, SOCK_STREAM, 0);
 410                 if ((sockfd < 0) ||
 411                     connect(sockfd, (struct sockaddr *)&sa, sizeof sa) < 0) {
 412                         strbuf_addf(&error_message, "%s[%d: %s]: errno=%s\n",
 413                                 host,
 414                                 cnt,
 415                                 inet_ntoa(*(struct in_addr *)&sa.sin_addr),
 416                                 strerror(errno));
 417                         if (0 <= sockfd)
 418                                 close(sockfd);
 419                         sockfd = -1;
 420                         continue;
 421                 }
 422                 if (flags & CONNECT_VERBOSE)
 423                         fprintf(stderr, "%s ",
 424                                 inet_ntoa(*(struct in_addr *)&sa.sin_addr));
 425                 break;
 426         }
 427
 428         if (sockfd < 0)
 429                 die("unable to connect to %s:\n%s", host, error_message.buf);
 430
 431         enable_keepalive(sockfd);
 432
 433         if (flags & CONNECT_VERBOSE)
 434                 fprintf(stderr, "done.\n");
 435
 436         return sockfd;
 437 }
 438
 439 #endif /* NO_IPV6 */
 440
 441
 442 static void git_tcp_connect(int fd[2], char *host, int flags)
 443 {
 444         int sockfd = git_tcp_connect_sock(host, flags);
 445
 446         fd[0] = sockfd;
 447         fd[1] = dup(sockfd);
 448 }
 449
 450
 451 static char *git_proxy_command;
 452
 453 static int git_proxy_command_options(const char *var, const char *value,
 454                 void *cb)
 455 {
 456         if (!strcmp(var, "core.gitproxy")) {
 457                 const char *for_pos;
 458                 int matchlen = -1;
 459                 int hostlen;
 460                 const char *rhost_name = cb;
 461                 int rhost_len = strlen(rhost_name);
 462
 463                 if (git_proxy_command)
 464                         return 0;
 465                 if (!value)
 466                         return config_error_nonbool(var);
 467                 /* [core]
 468                  * ;# matches www.kernel.org as well
 469                  * gitproxy = netcatter-1 for kernel.org
 470                  * gitproxy = netcatter-2 for sample.xz
 471                  * gitproxy = netcatter-default
 472                  */
 473                 for_pos = strstr(value, " for ");
 474                 if (!for_pos)
 475                         /* matches everybody */
 476                         matchlen = strlen(value);
 477                 else {
 478                         hostlen = strlen(for_pos + 5);
 479                         if (rhost_len < hostlen)
 480                                 matchlen = -1;
 481                         else if (!strncmp(for_pos + 5,
 482                                           rhost_name + rhost_len - hostlen,
 483                                           hostlen) &&
 484                                  ((rhost_len == hostlen) ||
 485                                   rhost_name[rhost_len - hostlen -1] == '.'))
 486                                 matchlen = for_pos - value;
 487                         else
 488                                 matchlen = -1;
 489                 }
 490                 if (0 <= matchlen) {
 491                         /* core.gitproxy = none for kernel.org */
 492                         if (matchlen == 4 &&
 493                             !memcmp(value, "none", 4))
 494                                 matchlen = 0;
 495                         git_proxy_command = xmemdupz(value, matchlen);
 496                 }
 497                 return 0;
 498         }
 499
 500         return git_default_config(var, value, cb);
 501 }
 502
 503 static int git_use_proxy(const char *host)
 504 {
 505         git_proxy_command = getenv("GIT_PROXY_COMMAND");
 506         git_config(git_proxy_command_options, (void*)host);
 507         return (git_proxy_command && *git_proxy_command);
 508 }
 509
 510 static struct child_process *git_proxy_connect(int fd[2], char *host)
 511 {
 512         const char *port = STR(DEFAULT_GIT_PORT);
 513         const char **argv;
 514         struct child_process *proxy;
 515
 516         get_host_and_port(&host, &port);
 517
 518         argv = xmalloc(sizeof(*argv) * 4);
 519         argv[0] = git_proxy_command;
 520         argv[1] = host;
 521         argv[2] = port;
 522         argv[3] = NULL;
 523         proxy = xcalloc(1, sizeof(*proxy));
 524         proxy->argv = argv;
 525         proxy->in = -1;
 526         proxy->out = -1;
 527         if (start_command(proxy))
 528                 die("cannot start proxy %s", argv[0]);
 529         fd[0] = proxy->out; /* read from proxy stdout */
 530         fd[1] = proxy->in;  /* write to proxy stdin */
 531         return proxy;
 532 }
 533
 534 #define MAX_CMD_LEN 1024
 535
 536 static char *get_port(char *host)
 537 {
 538         char *end;
 539         char *p = strchr(host, ':');
 540
 541         if (p) {
 542                 long port = strtol(p + 1, &end, 10);
 543                 if (end != p + 1 && *end == '\0' && 0 <= port && port < 65536) {
 544                         *p = '\0';
 545                         return p+1;
 546                 }
 547         }
 548
 549         return NULL;
 550 }
 551
 552 static struct child_process no_fork;
 553
 554 /*
 555  * This returns a dummy child_process if the transport protocol does not
 556  * need fork(2), or a struct child_process object if it does.  Once done,
 557  * finish the connection with finish_connect() with the value returned from
 558  * this function (it is safe to call finish_connect() with NULL to support
 559  * the former case).
 560  *
 561  * If it returns, the connect is successful; it just dies on errors (this
 562  * will hopefully be changed in a libification effort, to return NULL when
 563  * the connection failed).
 564  */
 565 struct child_process *git_connect(int fd[2], const char *url_orig,
 566                                   const char *prog, int flags)
 567 {
 568         char *url;
 569         char *host, *path;
 570         char *end;
 571         int c;
 572         struct child_process *conn = &no_fork;
 573         enum protocol protocol = PROTO_LOCAL;
 574         int free_path = 0;
 575         char *port = NULL;
 576         const char **arg;
 577         struct strbuf cmd;
 578
 579         /* Without this we cannot rely on waitpid() to tell
 580          * what happened to our children.
 581          */
 582         signal(SIGCHLD, SIG_DFL);
 583
 584         if (is_url(url_orig))
 585                 url = url_decode(url_orig);
 586         else
 587                 url = xstrdup(url_orig);
 588
 589         host = strstr(url, "://");
 590         if (host) {
 591                 *host = '\0';
 592                 protocol = get_protocol(url);
 593                 host += 3;
 594                 c = '/';
 595         } else {
 596                 host = url;
 597                 c = ':';
 598         }
 599
 600         /*
 601          * Don't do destructive transforms with git:// as that
 602          * protocol code does '[]' unwrapping of its own.
 603          */
 604         if (host[0] == '[') {
 605                 end = strchr(host + 1, ']');
 606                 if (end) {
 607                         if (protocol != PROTO_GIT) {
 608                                 *end = 0;
 609                                 host++;
 610                         }
 611                         end++;
 612                 } else
 613                         end = host;
 614         } else
 615                 end = host;
 616
 617         path = strchr(end, c);
 618         if (path && !has_dos_drive_prefix(end)) {
 619                 if (c == ':') {
 620                         if (host != url || path < strchrnul(host, '/')) {
 621                                 protocol = PROTO_SSH;
 622                                 *path++ = '\0';
 623                         } else /* '/' in the host part, assume local path */
 624                                 path = end;
 625                 }
 626         } else
 627                 path = end;
 628
 629         if (!path || !*path)
 630                 die("No path specified. See 'man git-pull' for valid url syntax");
 631
 632         /*
 633          * null-terminate hostname and point path to ~ for URL's like this:
 634          *    ssh://host.xz/~user/repo
 635          */
 636         if (protocol != PROTO_LOCAL && host != url) {
 637                 char *ptr = path;
 638                 if (path[1] == '~')
 639                         path++;
 640                 else {
 641                         path = xstrdup(ptr);
 642                         free_path = 1;
 643                 }
 644
 645                 *ptr = '\0';
 646         }
 647
 648         /*
 649          * Add support for ssh port: ssh://host.xy:<port>/...
 650          */
 651         if (protocol == PROTO_SSH && host != url)
 652                 port = get_port(end);
 653
 654         if (protocol == PROTO_GIT) {
 655                 /* These underlying connection commands die() if they
 656                  * cannot connect.
 657                  */
 658                 char *target_host = xstrdup(host);
 659                 if (git_use_proxy(host))
 660                         conn = git_proxy_connect(fd, host);
 661                 else
 662                         git_tcp_connect(fd, host, flags);
 663                 /*
 664                  * Separate original protocol components prog and path
 665                  * from extended host header with a NUL byte.
 666                  *
 667                  * Note: Do not add any other headers here!  Doing so
 668                  * will cause older git-daemon servers to crash.
 669                  */
 670                 packet_write(fd[1],
 671                              "%s %s%chost=%s%c",
 672                              prog, path, 0,
 673                              target_host, 0);
 674                 free(target_host);
 675                 free(url);
 676                 if (free_path)
 677                         free(path);
 678                 return conn;
 679         }
 680
 681         conn = xcalloc(1, sizeof(*conn));
 682
 683         strbuf_init(&cmd, MAX_CMD_LEN);
 684         strbuf_addstr(&cmd, prog);
 685         strbuf_addch(&cmd, ' ');
 686         sq_quote_buf(&cmd, path);
 687         if (cmd.len >= MAX_CMD_LEN)
 688                 die("command line too long");
 689
 690         conn->in = conn->out = -1;
 691         conn->argv = arg = xcalloc(7, sizeof(*arg));
 692         if (protocol == PROTO_SSH) {
 693                 const char *ssh = getenv("GIT_SSH");
 694                 int putty = ssh && strcasestr(ssh, "plink");
 695                 if (!ssh) ssh = "ssh";
 696
 697                 *arg++ = ssh;
 698                 if (putty && !strcasestr(ssh, "tortoiseplink"))
 699                         *arg++ = "-batch";
 700                 if (port) {
 701                         /* P is for PuTTY, p is for OpenSSH */
 702                         *arg++ = putty ? "-P" : "-p";
 703                         *arg++ = port;
 704                 }
 705                 *arg++ = host;
 706         }
 707         else {
 708                 /* remove repo-local variables from the environment */
 709                 conn->env = local_repo_env;
 710                 conn->use_shell = 1;
 711         }
 712         *arg++ = cmd.buf;
 713         *arg = NULL;
 714
 715         if (start_command(conn))
 716                 die("unable to fork");
 717
 718         fd[0] = conn->out; /* read from child's stdout */
 719         fd[1] = conn->in;  /* write to child's stdin */
 720         strbuf_release(&cmd);
 721         free(url);
 722         if (free_path)
 723                 free(path);
 724         return conn;
 725 }
 726
 727 int git_connection_is_socket(struct child_process *conn)
 728 {
 729         return conn == &no_fork;
 730 }
 731
 732 int finish_connect(struct child_process *conn)
 733 {
 734         int code;
 735         if (!conn || git_connection_is_socket(conn))
 736                 return 0;
 737
 738         code = finish_command(conn);
 739         free(conn->argv);
 740         free(conn);
 741         return code;
 742 }