t7063: tests for untracked cache
[git] / 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, 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
40 int check_ref_type(const struct ref *ref, int flags)
41 {
42         return check_ref(ref->name, flags);
43 }
44
45 static 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
55 static 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;
76 reject:
77         free(sym);
78         return;
79 }
80
81 static 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         string_list_sort(&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  */
111 struct 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 && !strcmp(name, ".have")) {
161                         sha1_array_append(extra_have, old_sha1);
162                         continue;
163                 }
164
165                 if (!check_ref(name, flags))
166                         continue;
167                 ref = alloc_ref(buffer + 41);
168                 hashcpy(ref->old_sha1, old_sha1);
169                 *list = ref;
170                 list = &ref->next;
171                 got_at_least_one_head = 1;
172         }
173
174         annotate_refs_with_symref_info(*orig_list);
175
176         return list;
177 }
178
179 static const char *parse_feature_value(const char *feature_list, const char *feature, int *lenp)
180 {
181         int len;
182
183         if (!feature_list)
184                 return NULL;
185
186         len = strlen(feature);
187         while (*feature_list) {
188                 const char *found = strstr(feature_list, feature);
189                 if (!found)
190                         return NULL;
191                 if (feature_list == found || isspace(found[-1])) {
192                         const char *value = found + len;
193                         /* feature with no value (e.g., "thin-pack") */
194                         if (!*value || isspace(*value)) {
195                                 if (lenp)
196                                         *lenp = 0;
197                                 return value;
198                         }
199                         /* feature with a value (e.g., "agent=git/1.2.3") */
200                         else if (*value == '=') {
201                                 value++;
202                                 if (lenp)
203                                         *lenp = strcspn(value, " \t\n");
204                                 return value;
205                         }
206                         /*
207                          * otherwise we matched a substring of another feature;
208                          * keep looking
209                          */
210                 }
211                 feature_list = found + 1;
212         }
213         return NULL;
214 }
215
216 int parse_feature_request(const char *feature_list, const char *feature)
217 {
218         return !!parse_feature_value(feature_list, feature, NULL);
219 }
220
221 const char *server_feature_value(const char *feature, int *len)
222 {
223         return parse_feature_value(server_capabilities, feature, len);
224 }
225
226 int server_supports(const char *feature)
227 {
228         return !!server_feature_value(feature, NULL);
229 }
230
231 enum protocol {
232         PROTO_LOCAL = 1,
233         PROTO_FILE,
234         PROTO_SSH,
235         PROTO_GIT
236 };
237
238 int url_is_local_not_ssh(const char *url)
239 {
240         const char *colon = strchr(url, ':');
241         const char *slash = strchr(url, '/');
242         return !colon || (slash && slash < colon) ||
243                 has_dos_drive_prefix(url);
244 }
245
246 static const char *prot_name(enum protocol protocol)
247 {
248         switch (protocol) {
249                 case PROTO_LOCAL:
250                 case PROTO_FILE:
251                         return "file";
252                 case PROTO_SSH:
253                         return "ssh";
254                 case PROTO_GIT:
255                         return "git";
256                 default:
257                         return "unkown protocol";
258         }
259 }
260
261 static enum protocol get_protocol(const char *name)
262 {
263         if (!strcmp(name, "ssh"))
264                 return PROTO_SSH;
265         if (!strcmp(name, "git"))
266                 return PROTO_GIT;
267         if (!strcmp(name, "git+ssh"))
268                 return PROTO_SSH;
269         if (!strcmp(name, "ssh+git"))
270                 return PROTO_SSH;
271         if (!strcmp(name, "file"))
272                 return PROTO_FILE;
273         die("I don't handle protocol '%s'", name);
274 }
275
276 static char *host_end(char **hoststart, int removebrackets)
277 {
278         char *host = *hoststart;
279         char *end;
280         char *start = strstr(host, "@[");
281         if (start)
282                 start++; /* Jump over '@' */
283         else
284                 start = host;
285         if (start[0] == '[') {
286                 end = strchr(start + 1, ']');
287                 if (end) {
288                         if (removebrackets) {
289                                 *end = 0;
290                                 memmove(start, start + 1, end - start);
291                                 end++;
292                         }
293                 } else
294                         end = host;
295         } else
296                 end = host;
297         return end;
298 }
299
300 #define STR_(s) # s
301 #define STR(s)  STR_(s)
302
303 static void get_host_and_port(char **host, const char **port)
304 {
305         char *colon, *end;
306         end = host_end(host, 1);
307         colon = strchr(end, ':');
308         if (colon) {
309                 long portnr = strtol(colon + 1, &end, 10);
310                 if (end != colon + 1 && *end == '\0' && 0 <= portnr && portnr < 65536) {
311                         *colon = 0;
312                         *port = colon + 1;
313                 }
314         }
315 }
316
317 static void enable_keepalive(int sockfd)
318 {
319         int ka = 1;
320
321         if (setsockopt(sockfd, SOL_SOCKET, SO_KEEPALIVE, &ka, sizeof(ka)) < 0)
322                 fprintf(stderr, "unable to set SO_KEEPALIVE on socket: %s\n",
323                         strerror(errno));
324 }
325
326 #ifndef NO_IPV6
327
328 static const char *ai_name(const struct addrinfo *ai)
329 {
330         static char addr[NI_MAXHOST];
331         if (getnameinfo(ai->ai_addr, ai->ai_addrlen, addr, sizeof(addr), NULL, 0,
332                         NI_NUMERICHOST) != 0)
333                 strcpy(addr, "(unknown)");
334
335         return addr;
336 }
337
338 /*
339  * Returns a connected socket() fd, or else die()s.
340  */
341 static int git_tcp_connect_sock(char *host, int flags)
342 {
343         struct strbuf error_message = STRBUF_INIT;
344         int sockfd = -1;
345         const char *port = STR(DEFAULT_GIT_PORT);
346         struct addrinfo hints, *ai0, *ai;
347         int gai;
348         int cnt = 0;
349
350         get_host_and_port(&host, &port);
351         if (!*port)
352                 port = "<none>";
353
354         memset(&hints, 0, sizeof(hints));
355         hints.ai_socktype = SOCK_STREAM;
356         hints.ai_protocol = IPPROTO_TCP;
357
358         if (flags & CONNECT_VERBOSE)
359                 fprintf(stderr, "Looking up %s ... ", host);
360
361         gai = getaddrinfo(host, port, &hints, &ai);
362         if (gai)
363                 die("Unable to look up %s (port %s) (%s)", host, port, gai_strerror(gai));
364
365         if (flags & CONNECT_VERBOSE)
366                 fprintf(stderr, "done.\nConnecting to %s (port %s) ... ", host, port);
367
368         for (ai0 = ai; ai; ai = ai->ai_next, cnt++) {
369                 sockfd = socket(ai->ai_family,
370                                 ai->ai_socktype, ai->ai_protocol);
371                 if ((sockfd < 0) ||
372                     (connect(sockfd, ai->ai_addr, ai->ai_addrlen) < 0)) {
373                         strbuf_addf(&error_message, "%s[%d: %s]: errno=%s\n",
374                                     host, cnt, ai_name(ai), strerror(errno));
375                         if (0 <= sockfd)
376                                 close(sockfd);
377                         sockfd = -1;
378                         continue;
379                 }
380                 if (flags & CONNECT_VERBOSE)
381                         fprintf(stderr, "%s ", ai_name(ai));
382                 break;
383         }
384
385         freeaddrinfo(ai0);
386
387         if (sockfd < 0)
388                 die("unable to connect to %s:\n%s", host, error_message.buf);
389
390         enable_keepalive(sockfd);
391
392         if (flags & CONNECT_VERBOSE)
393                 fprintf(stderr, "done.\n");
394
395         strbuf_release(&error_message);
396
397         return sockfd;
398 }
399
400 #else /* NO_IPV6 */
401
402 /*
403  * Returns a connected socket() fd, or else die()s.
404  */
405 static int git_tcp_connect_sock(char *host, int flags)
406 {
407         struct strbuf error_message = STRBUF_INIT;
408         int sockfd = -1;
409         const char *port = STR(DEFAULT_GIT_PORT);
410         char *ep;
411         struct hostent *he;
412         struct sockaddr_in sa;
413         char **ap;
414         unsigned int nport;
415         int cnt;
416
417         get_host_and_port(&host, &port);
418
419         if (flags & CONNECT_VERBOSE)
420                 fprintf(stderr, "Looking up %s ... ", host);
421
422         he = gethostbyname(host);
423         if (!he)
424                 die("Unable to look up %s (%s)", host, hstrerror(h_errno));
425         nport = strtoul(port, &ep, 10);
426         if ( ep == port || *ep ) {
427                 /* Not numeric */
428                 struct servent *se = getservbyname(port,"tcp");
429                 if ( !se )
430                         die("Unknown port %s", port);
431                 nport = se->s_port;
432         }
433
434         if (flags & CONNECT_VERBOSE)
435                 fprintf(stderr, "done.\nConnecting to %s (port %s) ... ", host, port);
436
437         for (cnt = 0, ap = he->h_addr_list; *ap; ap++, cnt++) {
438                 memset(&sa, 0, sizeof sa);
439                 sa.sin_family = he->h_addrtype;
440                 sa.sin_port = htons(nport);
441                 memcpy(&sa.sin_addr, *ap, he->h_length);
442
443                 sockfd = socket(he->h_addrtype, SOCK_STREAM, 0);
444                 if ((sockfd < 0) ||
445                     connect(sockfd, (struct sockaddr *)&sa, sizeof sa) < 0) {
446                         strbuf_addf(&error_message, "%s[%d: %s]: errno=%s\n",
447                                 host,
448                                 cnt,
449                                 inet_ntoa(*(struct in_addr *)&sa.sin_addr),
450                                 strerror(errno));
451                         if (0 <= sockfd)
452                                 close(sockfd);
453                         sockfd = -1;
454                         continue;
455                 }
456                 if (flags & CONNECT_VERBOSE)
457                         fprintf(stderr, "%s ",
458                                 inet_ntoa(*(struct in_addr *)&sa.sin_addr));
459                 break;
460         }
461
462         if (sockfd < 0)
463                 die("unable to connect to %s:\n%s", host, error_message.buf);
464
465         enable_keepalive(sockfd);
466
467         if (flags & CONNECT_VERBOSE)
468                 fprintf(stderr, "done.\n");
469
470         return sockfd;
471 }
472
473 #endif /* NO_IPV6 */
474
475
476 static void git_tcp_connect(int fd[2], char *host, int flags)
477 {
478         int sockfd = git_tcp_connect_sock(host, flags);
479
480         fd[0] = sockfd;
481         fd[1] = dup(sockfd);
482 }
483
484
485 static char *git_proxy_command;
486
487 static int git_proxy_command_options(const char *var, const char *value,
488                 void *cb)
489 {
490         if (!strcmp(var, "core.gitproxy")) {
491                 const char *for_pos;
492                 int matchlen = -1;
493                 int hostlen;
494                 const char *rhost_name = cb;
495                 int rhost_len = strlen(rhost_name);
496
497                 if (git_proxy_command)
498                         return 0;
499                 if (!value)
500                         return config_error_nonbool(var);
501                 /* [core]
502                  * ;# matches www.kernel.org as well
503                  * gitproxy = netcatter-1 for kernel.org
504                  * gitproxy = netcatter-2 for sample.xz
505                  * gitproxy = netcatter-default
506                  */
507                 for_pos = strstr(value, " for ");
508                 if (!for_pos)
509                         /* matches everybody */
510                         matchlen = strlen(value);
511                 else {
512                         hostlen = strlen(for_pos + 5);
513                         if (rhost_len < hostlen)
514                                 matchlen = -1;
515                         else if (!strncmp(for_pos + 5,
516                                           rhost_name + rhost_len - hostlen,
517                                           hostlen) &&
518                                  ((rhost_len == hostlen) ||
519                                   rhost_name[rhost_len - hostlen -1] == '.'))
520                                 matchlen = for_pos - value;
521                         else
522                                 matchlen = -1;
523                 }
524                 if (0 <= matchlen) {
525                         /* core.gitproxy = none for kernel.org */
526                         if (matchlen == 4 &&
527                             !memcmp(value, "none", 4))
528                                 matchlen = 0;
529                         git_proxy_command = xmemdupz(value, matchlen);
530                 }
531                 return 0;
532         }
533
534         return git_default_config(var, value, cb);
535 }
536
537 static int git_use_proxy(const char *host)
538 {
539         git_proxy_command = getenv("GIT_PROXY_COMMAND");
540         git_config(git_proxy_command_options, (void*)host);
541         return (git_proxy_command && *git_proxy_command);
542 }
543
544 static struct child_process *git_proxy_connect(int fd[2], char *host)
545 {
546         const char *port = STR(DEFAULT_GIT_PORT);
547         struct child_process *proxy;
548
549         get_host_and_port(&host, &port);
550
551         proxy = xmalloc(sizeof(*proxy));
552         child_process_init(proxy);
553         argv_array_push(&proxy->args, git_proxy_command);
554         argv_array_push(&proxy->args, host);
555         argv_array_push(&proxy->args, port);
556         proxy->in = -1;
557         proxy->out = -1;
558         if (start_command(proxy))
559                 die("cannot start proxy %s", git_proxy_command);
560         fd[0] = proxy->out; /* read from proxy stdout */
561         fd[1] = proxy->in;  /* write to proxy stdin */
562         return proxy;
563 }
564
565 static char *get_port(char *host)
566 {
567         char *end;
568         char *p = strchr(host, ':');
569
570         if (p) {
571                 long port = strtol(p + 1, &end, 10);
572                 if (end != p + 1 && *end == '\0' && 0 <= port && port < 65536) {
573                         *p = '\0';
574                         return p+1;
575                 }
576         }
577
578         return NULL;
579 }
580
581 /*
582  * Extract protocol and relevant parts from the specified connection URL.
583  * The caller must free() the returned strings.
584  */
585 static enum protocol parse_connect_url(const char *url_orig, char **ret_host,
586                                        char **ret_path)
587 {
588         char *url;
589         char *host, *path;
590         char *end;
591         int separator = '/';
592         enum protocol protocol = PROTO_LOCAL;
593
594         if (is_url(url_orig))
595                 url = url_decode(url_orig);
596         else
597                 url = xstrdup(url_orig);
598
599         host = strstr(url, "://");
600         if (host) {
601                 *host = '\0';
602                 protocol = get_protocol(url);
603                 host += 3;
604         } else {
605                 host = url;
606                 if (!url_is_local_not_ssh(url)) {
607                         protocol = PROTO_SSH;
608                         separator = ':';
609                 }
610         }
611
612         /*
613          * Don't do destructive transforms as protocol code does
614          * '[]' unwrapping in get_host_and_port()
615          */
616         end = host_end(&host, 0);
617
618         if (protocol == PROTO_LOCAL)
619                 path = end;
620         else if (protocol == PROTO_FILE && has_dos_drive_prefix(end))
621                 path = end; /* "file://$(pwd)" may be "file://C:/projects/repo" */
622         else
623                 path = strchr(end, separator);
624
625         if (!path || !*path)
626                 die("No path specified. See 'man git-pull' for valid url syntax");
627
628         /*
629          * null-terminate hostname and point path to ~ for URL's like this:
630          *    ssh://host.xz/~user/repo
631          */
632
633         end = path; /* Need to \0 terminate host here */
634         if (separator == ':')
635                 path++; /* path starts after ':' */
636         if (protocol == PROTO_GIT || protocol == PROTO_SSH) {
637                 if (path[1] == '~')
638                         path++;
639         }
640
641         path = xstrdup(path);
642         *end = '\0';
643
644         *ret_host = xstrdup(host);
645         *ret_path = path;
646         free(url);
647         return protocol;
648 }
649
650 static struct child_process no_fork = CHILD_PROCESS_INIT;
651
652 /*
653  * This returns a dummy child_process if the transport protocol does not
654  * need fork(2), or a struct child_process object if it does.  Once done,
655  * finish the connection with finish_connect() with the value returned from
656  * this function (it is safe to call finish_connect() with NULL to support
657  * the former case).
658  *
659  * If it returns, the connect is successful; it just dies on errors (this
660  * will hopefully be changed in a libification effort, to return NULL when
661  * the connection failed).
662  */
663 struct child_process *git_connect(int fd[2], const char *url,
664                                   const char *prog, int flags)
665 {
666         char *hostandport, *path;
667         struct child_process *conn = &no_fork;
668         enum protocol protocol;
669         struct strbuf cmd = STRBUF_INIT;
670
671         /* Without this we cannot rely on waitpid() to tell
672          * what happened to our children.
673          */
674         signal(SIGCHLD, SIG_DFL);
675
676         protocol = parse_connect_url(url, &hostandport, &path);
677         if ((flags & CONNECT_DIAG_URL) && (protocol != PROTO_SSH)) {
678                 printf("Diag: url=%s\n", url ? url : "NULL");
679                 printf("Diag: protocol=%s\n", prot_name(protocol));
680                 printf("Diag: hostandport=%s\n", hostandport ? hostandport : "NULL");
681                 printf("Diag: path=%s\n", path ? path : "NULL");
682                 conn = NULL;
683         } else if (protocol == PROTO_GIT) {
684                 /*
685                  * Set up virtual host information based on where we will
686                  * connect, unless the user has overridden us in
687                  * the environment.
688                  */
689                 char *target_host = getenv("GIT_OVERRIDE_VIRTUAL_HOST");
690                 if (target_host)
691                         target_host = xstrdup(target_host);
692                 else
693                         target_host = xstrdup(hostandport);
694
695                 /* These underlying connection commands die() if they
696                  * cannot connect.
697                  */
698                 if (git_use_proxy(hostandport))
699                         conn = git_proxy_connect(fd, hostandport);
700                 else
701                         git_tcp_connect(fd, hostandport, flags);
702                 /*
703                  * Separate original protocol components prog and path
704                  * from extended host header with a NUL byte.
705                  *
706                  * Note: Do not add any other headers here!  Doing so
707                  * will cause older git-daemon servers to crash.
708                  */
709                 packet_write(fd[1],
710                              "%s %s%chost=%s%c",
711                              prog, path, 0,
712                              target_host, 0);
713                 free(target_host);
714         } else {
715                 conn = xmalloc(sizeof(*conn));
716                 child_process_init(conn);
717
718                 strbuf_addstr(&cmd, prog);
719                 strbuf_addch(&cmd, ' ');
720                 sq_quote_buf(&cmd, path);
721
722                 conn->in = conn->out = -1;
723                 if (protocol == PROTO_SSH) {
724                         const char *ssh;
725                         int putty;
726                         char *ssh_host = hostandport;
727                         const char *port = NULL;
728                         get_host_and_port(&ssh_host, &port);
729
730                         if (!port)
731                                 port = get_port(ssh_host);
732
733                         if (flags & CONNECT_DIAG_URL) {
734                                 printf("Diag: url=%s\n", url ? url : "NULL");
735                                 printf("Diag: protocol=%s\n", prot_name(protocol));
736                                 printf("Diag: userandhost=%s\n", ssh_host ? ssh_host : "NULL");
737                                 printf("Diag: port=%s\n", port ? port : "NONE");
738                                 printf("Diag: path=%s\n", path ? path : "NULL");
739
740                                 free(hostandport);
741                                 free(path);
742                                 return NULL;
743                         } else {
744                                 ssh = getenv("GIT_SSH_COMMAND");
745                                 if (ssh) {
746                                         conn->use_shell = 1;
747                                         putty = 0;
748                                 } else {
749                                         ssh = getenv("GIT_SSH");
750                                         if (!ssh)
751                                                 ssh = "ssh";
752                                         putty = !!strcasestr(ssh, "plink");
753                                 }
754
755                                 argv_array_push(&conn->args, ssh);
756                                 if (putty && !strcasestr(ssh, "tortoiseplink"))
757                                         argv_array_push(&conn->args, "-batch");
758                                 if (port) {
759                                         /* P is for PuTTY, p is for OpenSSH */
760                                         argv_array_push(&conn->args, putty ? "-P" : "-p");
761                                         argv_array_push(&conn->args, port);
762                                 }
763                                 argv_array_push(&conn->args, ssh_host);
764                         }
765                 } else {
766                         /* remove repo-local variables from the environment */
767                         conn->env = local_repo_env;
768                         conn->use_shell = 1;
769                 }
770                 argv_array_push(&conn->args, cmd.buf);
771
772                 if (start_command(conn))
773                         die("unable to fork");
774
775                 fd[0] = conn->out; /* read from child's stdout */
776                 fd[1] = conn->in;  /* write to child's stdin */
777                 strbuf_release(&cmd);
778         }
779         free(hostandport);
780         free(path);
781         return conn;
782 }
783
784 int git_connection_is_socket(struct child_process *conn)
785 {
786         return conn == &no_fork;
787 }
788
789 int finish_connect(struct child_process *conn)
790 {
791         int code;
792         if (!conn || git_connection_is_socket(conn))
793                 return 0;
794
795         code = finish_command(conn);
796         free(conn);
797         return code;
798 }