Merge branch 'jk/add-ignore-errors-bit-assignment-fix'
[git] / remote-curl.c
1 #include "cache.h"
2 #include "config.h"
3 #include "remote.h"
4 #include "connect.h"
5 #include "strbuf.h"
6 #include "walker.h"
7 #include "http.h"
8 #include "exec-cmd.h"
9 #include "run-command.h"
10 #include "pkt-line.h"
11 #include "string-list.h"
12 #include "sideband.h"
13 #include "argv-array.h"
14 #include "credential.h"
15 #include "sha1-array.h"
16 #include "send-pack.h"
17 #include "protocol.h"
18 #include "quote.h"
19
20 static struct remote *remote;
21 /* always ends with a trailing slash */
22 static struct strbuf url = STRBUF_INIT;
23
24 struct options {
25         int verbosity;
26         unsigned long depth;
27         char *deepen_since;
28         struct string_list deepen_not;
29         struct string_list push_options;
30         char *filter;
31         unsigned progress : 1,
32                 check_self_contained_and_connected : 1,
33                 cloning : 1,
34                 update_shallow : 1,
35                 followtags : 1,
36                 dry_run : 1,
37                 thin : 1,
38                 /* One of the SEND_PACK_PUSH_CERT_* constants. */
39                 push_cert : 2,
40                 deepen_relative : 1,
41                 from_promisor : 1,
42                 no_dependents : 1;
43 };
44 static struct options options;
45 static struct string_list cas_options = STRING_LIST_INIT_DUP;
46
47 static int set_option(const char *name, const char *value)
48 {
49         if (!strcmp(name, "verbosity")) {
50                 char *end;
51                 int v = strtol(value, &end, 10);
52                 if (value == end || *end)
53                         return -1;
54                 options.verbosity = v;
55                 return 0;
56         }
57         else if (!strcmp(name, "progress")) {
58                 if (!strcmp(value, "true"))
59                         options.progress = 1;
60                 else if (!strcmp(value, "false"))
61                         options.progress = 0;
62                 else
63                         return -1;
64                 return 0;
65         }
66         else if (!strcmp(name, "depth")) {
67                 char *end;
68                 unsigned long v = strtoul(value, &end, 10);
69                 if (value == end || *end)
70                         return -1;
71                 options.depth = v;
72                 return 0;
73         }
74         else if (!strcmp(name, "deepen-since")) {
75                 options.deepen_since = xstrdup(value);
76                 return 0;
77         }
78         else if (!strcmp(name, "deepen-not")) {
79                 string_list_append(&options.deepen_not, value);
80                 return 0;
81         }
82         else if (!strcmp(name, "deepen-relative")) {
83                 if (!strcmp(value, "true"))
84                         options.deepen_relative = 1;
85                 else if (!strcmp(value, "false"))
86                         options.deepen_relative = 0;
87                 else
88                         return -1;
89                 return 0;
90         }
91         else if (!strcmp(name, "followtags")) {
92                 if (!strcmp(value, "true"))
93                         options.followtags = 1;
94                 else if (!strcmp(value, "false"))
95                         options.followtags = 0;
96                 else
97                         return -1;
98                 return 0;
99         }
100         else if (!strcmp(name, "dry-run")) {
101                 if (!strcmp(value, "true"))
102                         options.dry_run = 1;
103                 else if (!strcmp(value, "false"))
104                         options.dry_run = 0;
105                 else
106                         return -1;
107                 return 0;
108         }
109         else if (!strcmp(name, "check-connectivity")) {
110                 if (!strcmp(value, "true"))
111                         options.check_self_contained_and_connected = 1;
112                 else if (!strcmp(value, "false"))
113                         options.check_self_contained_and_connected = 0;
114                 else
115                         return -1;
116                 return 0;
117         }
118         else if (!strcmp(name, "cas")) {
119                 struct strbuf val = STRBUF_INIT;
120                 strbuf_addf(&val, "--" CAS_OPT_NAME "=%s", value);
121                 string_list_append(&cas_options, val.buf);
122                 strbuf_release(&val);
123                 return 0;
124         } else if (!strcmp(name, "cloning")) {
125                 if (!strcmp(value, "true"))
126                         options.cloning = 1;
127                 else if (!strcmp(value, "false"))
128                         options.cloning = 0;
129                 else
130                         return -1;
131                 return 0;
132         } else if (!strcmp(name, "update-shallow")) {
133                 if (!strcmp(value, "true"))
134                         options.update_shallow = 1;
135                 else if (!strcmp(value, "false"))
136                         options.update_shallow = 0;
137                 else
138                         return -1;
139                 return 0;
140         } else if (!strcmp(name, "pushcert")) {
141                 if (!strcmp(value, "true"))
142                         options.push_cert = SEND_PACK_PUSH_CERT_ALWAYS;
143                 else if (!strcmp(value, "false"))
144                         options.push_cert = SEND_PACK_PUSH_CERT_NEVER;
145                 else if (!strcmp(value, "if-asked"))
146                         options.push_cert = SEND_PACK_PUSH_CERT_IF_ASKED;
147                 else
148                         return -1;
149                 return 0;
150         } else if (!strcmp(name, "push-option")) {
151                 if (*value != '"')
152                         string_list_append(&options.push_options, value);
153                 else {
154                         struct strbuf unquoted = STRBUF_INIT;
155                         if (unquote_c_style(&unquoted, value, NULL) < 0)
156                                 die("invalid quoting in push-option value");
157                         string_list_append_nodup(&options.push_options,
158                                                  strbuf_detach(&unquoted, NULL));
159                 }
160                 return 0;
161
162 #if LIBCURL_VERSION_NUM >= 0x070a08
163         } else if (!strcmp(name, "family")) {
164                 if (!strcmp(value, "ipv4"))
165                         git_curl_ipresolve = CURL_IPRESOLVE_V4;
166                 else if (!strcmp(value, "ipv6"))
167                         git_curl_ipresolve = CURL_IPRESOLVE_V6;
168                 else if (!strcmp(value, "all"))
169                         git_curl_ipresolve = CURL_IPRESOLVE_WHATEVER;
170                 else
171                         return -1;
172                 return 0;
173 #endif /* LIBCURL_VERSION_NUM >= 0x070a08 */
174         } else if (!strcmp(name, "from-promisor")) {
175                 options.from_promisor = 1;
176                 return 0;
177         } else if (!strcmp(name, "no-dependents")) {
178                 options.no_dependents = 1;
179                 return 0;
180         } else if (!strcmp(name, "filter")) {
181                 options.filter = xstrdup(value);
182                 return 0;
183         } else {
184                 return 1 /* unsupported */;
185         }
186 }
187
188 struct discovery {
189         char *service;
190         char *buf_alloc;
191         char *buf;
192         size_t len;
193         struct ref *refs;
194         struct oid_array shallow;
195         enum protocol_version version;
196         unsigned proto_git : 1;
197 };
198 static struct discovery *last_discovery;
199
200 static struct ref *parse_git_refs(struct discovery *heads, int for_push)
201 {
202         struct ref *list = NULL;
203         struct packet_reader reader;
204
205         packet_reader_init(&reader, -1, heads->buf, heads->len,
206                            PACKET_READ_CHOMP_NEWLINE |
207                            PACKET_READ_GENTLE_ON_EOF |
208                            PACKET_READ_DIE_ON_ERR_PACKET);
209
210         heads->version = discover_version(&reader);
211         switch (heads->version) {
212         case protocol_v2:
213                 /*
214                  * Do nothing.  This isn't a list of refs but rather a
215                  * capability advertisement.  Client would have run
216                  * 'stateless-connect' so we'll dump this capability listing
217                  * and let them request the refs themselves.
218                  */
219                 break;
220         case protocol_v1:
221         case protocol_v0:
222                 get_remote_heads(&reader, &list, for_push ? REF_NORMAL : 0,
223                                  NULL, &heads->shallow);
224                 break;
225         case protocol_unknown_version:
226                 BUG("unknown protocol version");
227         }
228
229         return list;
230 }
231
232 static struct ref *parse_info_refs(struct discovery *heads)
233 {
234         char *data, *start, *mid;
235         char *ref_name;
236         int i = 0;
237
238         struct ref *refs = NULL;
239         struct ref *ref = NULL;
240         struct ref *last_ref = NULL;
241
242         data = heads->buf;
243         start = NULL;
244         mid = data;
245         while (i < heads->len) {
246                 if (!start) {
247                         start = &data[i];
248                 }
249                 if (data[i] == '\t')
250                         mid = &data[i];
251                 if (data[i] == '\n') {
252                         if (mid - start != 40)
253                                 die("%sinfo/refs not valid: is this a git repository?",
254                                     url.buf);
255                         data[i] = 0;
256                         ref_name = mid + 1;
257                         ref = alloc_ref(ref_name);
258                         get_oid_hex(start, &ref->old_oid);
259                         if (!refs)
260                                 refs = ref;
261                         if (last_ref)
262                                 last_ref->next = ref;
263                         last_ref = ref;
264                         start = NULL;
265                 }
266                 i++;
267         }
268
269         ref = alloc_ref("HEAD");
270         if (!http_fetch_ref(url.buf, ref) &&
271             !resolve_remote_symref(ref, refs)) {
272                 ref->next = refs;
273                 refs = ref;
274         } else {
275                 free(ref);
276         }
277
278         return refs;
279 }
280
281 static void free_discovery(struct discovery *d)
282 {
283         if (d) {
284                 if (d == last_discovery)
285                         last_discovery = NULL;
286                 free(d->shallow.oid);
287                 free(d->buf_alloc);
288                 free_refs(d->refs);
289                 free(d->service);
290                 free(d);
291         }
292 }
293
294 static int show_http_message(struct strbuf *type, struct strbuf *charset,
295                              struct strbuf *msg)
296 {
297         const char *p, *eol;
298
299         /*
300          * We only show text/plain parts, as other types are likely
301          * to be ugly to look at on the user's terminal.
302          */
303         if (strcmp(type->buf, "text/plain"))
304                 return -1;
305         if (charset->len)
306                 strbuf_reencode(msg, charset->buf, get_log_output_encoding());
307
308         strbuf_trim(msg);
309         if (!msg->len)
310                 return -1;
311
312         p = msg->buf;
313         do {
314                 eol = strchrnul(p, '\n');
315                 fprintf(stderr, "remote: %.*s\n", (int)(eol - p), p);
316                 p = eol + 1;
317         } while(*eol);
318         return 0;
319 }
320
321 static int get_protocol_http_header(enum protocol_version version,
322                                     struct strbuf *header)
323 {
324         if (version > 0) {
325                 strbuf_addf(header, GIT_PROTOCOL_HEADER ": version=%d",
326                             version);
327
328                 return 1;
329         }
330
331         return 0;
332 }
333
334 static struct discovery *discover_refs(const char *service, int for_push)
335 {
336         struct strbuf exp = STRBUF_INIT;
337         struct strbuf type = STRBUF_INIT;
338         struct strbuf charset = STRBUF_INIT;
339         struct strbuf buffer = STRBUF_INIT;
340         struct strbuf refs_url = STRBUF_INIT;
341         struct strbuf effective_url = STRBUF_INIT;
342         struct strbuf protocol_header = STRBUF_INIT;
343         struct string_list extra_headers = STRING_LIST_INIT_DUP;
344         struct discovery *last = last_discovery;
345         int http_ret, maybe_smart = 0;
346         struct http_get_options http_options;
347         enum protocol_version version = get_protocol_version_config();
348
349         if (last && !strcmp(service, last->service))
350                 return last;
351         free_discovery(last);
352
353         strbuf_addf(&refs_url, "%sinfo/refs", url.buf);
354         if ((starts_with(url.buf, "http://") || starts_with(url.buf, "https://")) &&
355              git_env_bool("GIT_SMART_HTTP", 1)) {
356                 maybe_smart = 1;
357                 if (!strchr(url.buf, '?'))
358                         strbuf_addch(&refs_url, '?');
359                 else
360                         strbuf_addch(&refs_url, '&');
361                 strbuf_addf(&refs_url, "service=%s", service);
362         }
363
364         /*
365          * NEEDSWORK: If we are trying to use protocol v2 and we are planning
366          * to perform a push, then fallback to v0 since the client doesn't know
367          * how to push yet using v2.
368          */
369         if (version == protocol_v2 && !strcmp("git-receive-pack", service))
370                 version = protocol_v0;
371
372         /* Add the extra Git-Protocol header */
373         if (get_protocol_http_header(version, &protocol_header))
374                 string_list_append(&extra_headers, protocol_header.buf);
375
376         memset(&http_options, 0, sizeof(http_options));
377         http_options.content_type = &type;
378         http_options.charset = &charset;
379         http_options.effective_url = &effective_url;
380         http_options.base_url = &url;
381         http_options.extra_headers = &extra_headers;
382         http_options.initial_request = 1;
383         http_options.no_cache = 1;
384
385         http_ret = http_get_strbuf(refs_url.buf, &buffer, &http_options);
386         switch (http_ret) {
387         case HTTP_OK:
388                 break;
389         case HTTP_MISSING_TARGET:
390                 show_http_message(&type, &charset, &buffer);
391                 die("repository '%s' not found", url.buf);
392         case HTTP_NOAUTH:
393                 show_http_message(&type, &charset, &buffer);
394                 die("Authentication failed for '%s'", url.buf);
395         default:
396                 show_http_message(&type, &charset, &buffer);
397                 die("unable to access '%s': %s", url.buf, curl_errorstr);
398         }
399
400         if (options.verbosity && !starts_with(refs_url.buf, url.buf))
401                 warning(_("redirecting to %s"), url.buf);
402
403         last= xcalloc(1, sizeof(*last_discovery));
404         last->service = xstrdup(service);
405         last->buf_alloc = strbuf_detach(&buffer, &last->len);
406         last->buf = last->buf_alloc;
407
408         strbuf_addf(&exp, "application/x-%s-advertisement", service);
409         if (maybe_smart &&
410             (5 <= last->len && last->buf[4] == '#') &&
411             !strbuf_cmp(&exp, &type)) {
412                 struct packet_reader reader;
413                 packet_reader_init(&reader, -1, last->buf, last->len,
414                                    PACKET_READ_CHOMP_NEWLINE |
415                                    PACKET_READ_DIE_ON_ERR_PACKET);
416
417                 /*
418                  * smart HTTP response; validate that the service
419                  * pkt-line matches our request.
420                  */
421                 if (packet_reader_read(&reader) != PACKET_READ_NORMAL)
422                         die("invalid server response; expected service, got flush packet");
423
424                 strbuf_reset(&exp);
425                 strbuf_addf(&exp, "# service=%s", service);
426                 if (strcmp(reader.line, exp.buf))
427                         die("invalid server response; got '%s'", reader.line);
428                 strbuf_release(&exp);
429
430                 /* The header can include additional metadata lines, up
431                  * until a packet flush marker.  Ignore these now, but
432                  * in the future we might start to scan them.
433                  */
434                 for (;;) {
435                         packet_reader_read(&reader);
436                         if (reader.pktlen <= 0) {
437                                 break;
438                         }
439                 }
440
441                 last->buf = reader.src_buffer;
442                 last->len = reader.src_len;
443
444                 last->proto_git = 1;
445         } else if (maybe_smart &&
446                    last->len > 5 && starts_with(last->buf + 4, "version 2")) {
447                 last->proto_git = 1;
448         }
449
450         if (last->proto_git)
451                 last->refs = parse_git_refs(last, for_push);
452         else
453                 last->refs = parse_info_refs(last);
454
455         strbuf_release(&refs_url);
456         strbuf_release(&exp);
457         strbuf_release(&type);
458         strbuf_release(&charset);
459         strbuf_release(&effective_url);
460         strbuf_release(&buffer);
461         strbuf_release(&protocol_header);
462         string_list_clear(&extra_headers, 0);
463         last_discovery = last;
464         return last;
465 }
466
467 static struct ref *get_refs(int for_push)
468 {
469         struct discovery *heads;
470
471         if (for_push)
472                 heads = discover_refs("git-receive-pack", for_push);
473         else
474                 heads = discover_refs("git-upload-pack", for_push);
475
476         return heads->refs;
477 }
478
479 static void output_refs(struct ref *refs)
480 {
481         struct ref *posn;
482         for (posn = refs; posn; posn = posn->next) {
483                 if (posn->symref)
484                         printf("@%s %s\n", posn->symref, posn->name);
485                 else
486                         printf("%s %s\n", oid_to_hex(&posn->old_oid), posn->name);
487         }
488         printf("\n");
489         fflush(stdout);
490 }
491
492 struct rpc_state {
493         const char *service_name;
494         const char **argv;
495         struct strbuf *stdin_preamble;
496         char *service_url;
497         char *hdr_content_type;
498         char *hdr_accept;
499         char *protocol_header;
500         char *buf;
501         size_t alloc;
502         size_t len;
503         size_t pos;
504         int in;
505         int out;
506         int any_written;
507         struct strbuf result;
508         unsigned gzip_request : 1;
509         unsigned initial_buffer : 1;
510 };
511
512 static size_t rpc_out(void *ptr, size_t eltsize,
513                 size_t nmemb, void *buffer_)
514 {
515         size_t max = eltsize * nmemb;
516         struct rpc_state *rpc = buffer_;
517         size_t avail = rpc->len - rpc->pos;
518
519         if (!avail) {
520                 rpc->initial_buffer = 0;
521                 avail = packet_read(rpc->out, NULL, NULL, rpc->buf, rpc->alloc, 0);
522                 if (!avail)
523                         return 0;
524                 rpc->pos = 0;
525                 rpc->len = avail;
526         }
527
528         if (max < avail)
529                 avail = max;
530         memcpy(ptr, rpc->buf + rpc->pos, avail);
531         rpc->pos += avail;
532         return avail;
533 }
534
535 #ifndef NO_CURL_IOCTL
536 static curlioerr rpc_ioctl(CURL *handle, int cmd, void *clientp)
537 {
538         struct rpc_state *rpc = clientp;
539
540         switch (cmd) {
541         case CURLIOCMD_NOP:
542                 return CURLIOE_OK;
543
544         case CURLIOCMD_RESTARTREAD:
545                 if (rpc->initial_buffer) {
546                         rpc->pos = 0;
547                         return CURLIOE_OK;
548                 }
549                 error("unable to rewind rpc post data - try increasing http.postBuffer");
550                 return CURLIOE_FAILRESTART;
551
552         default:
553                 return CURLIOE_UNKNOWNCMD;
554         }
555 }
556 #endif
557
558 struct rpc_in_data {
559         struct rpc_state *rpc;
560         struct active_request_slot *slot;
561 };
562
563 /*
564  * A callback for CURLOPT_WRITEFUNCTION. The return value is the bytes consumed
565  * from ptr.
566  */
567 static size_t rpc_in(char *ptr, size_t eltsize,
568                 size_t nmemb, void *buffer_)
569 {
570         size_t size = eltsize * nmemb;
571         struct rpc_in_data *data = buffer_;
572         long response_code;
573
574         if (curl_easy_getinfo(data->slot->curl, CURLINFO_RESPONSE_CODE,
575                               &response_code) != CURLE_OK)
576                 return size;
577         if (response_code >= 300)
578                 return size;
579         if (size)
580                 data->rpc->any_written = 1;
581         write_or_die(data->rpc->in, ptr, size);
582         return size;
583 }
584
585 static int run_slot(struct active_request_slot *slot,
586                     struct slot_results *results)
587 {
588         int err;
589         struct slot_results results_buf;
590
591         if (!results)
592                 results = &results_buf;
593
594         err = run_one_slot(slot, results);
595
596         if (err != HTTP_OK && err != HTTP_REAUTH) {
597                 struct strbuf msg = STRBUF_INIT;
598                 if (results->http_code && results->http_code != 200)
599                         strbuf_addf(&msg, "HTTP %ld", results->http_code);
600                 if (results->curl_result != CURLE_OK) {
601                         if (msg.len)
602                                 strbuf_addch(&msg, ' ');
603                         strbuf_addf(&msg, "curl %d", results->curl_result);
604                         if (curl_errorstr[0]) {
605                                 strbuf_addch(&msg, ' ');
606                                 strbuf_addstr(&msg, curl_errorstr);
607                         }
608                 }
609                 error("RPC failed; %s", msg.buf);
610                 strbuf_release(&msg);
611         }
612
613         return err;
614 }
615
616 static int probe_rpc(struct rpc_state *rpc, struct slot_results *results)
617 {
618         struct active_request_slot *slot;
619         struct curl_slist *headers = http_copy_default_headers();
620         struct strbuf buf = STRBUF_INIT;
621         int err;
622
623         slot = get_active_slot();
624
625         headers = curl_slist_append(headers, rpc->hdr_content_type);
626         headers = curl_slist_append(headers, rpc->hdr_accept);
627
628         curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
629         curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
630         curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
631         curl_easy_setopt(slot->curl, CURLOPT_ENCODING, NULL);
632         curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, "0000");
633         curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, 4);
634         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
635         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
636         curl_easy_setopt(slot->curl, CURLOPT_FILE, &buf);
637
638         err = run_slot(slot, results);
639
640         curl_slist_free_all(headers);
641         strbuf_release(&buf);
642         return err;
643 }
644
645 static curl_off_t xcurl_off_t(size_t len)
646 {
647         uintmax_t size = len;
648         if (size > maximum_signed_value_of_type(curl_off_t))
649                 die("cannot handle pushes this big");
650         return (curl_off_t)size;
651 }
652
653 static int post_rpc(struct rpc_state *rpc)
654 {
655         struct active_request_slot *slot;
656         struct curl_slist *headers = http_copy_default_headers();
657         int use_gzip = rpc->gzip_request;
658         char *gzip_body = NULL;
659         size_t gzip_size = 0;
660         int err, large_request = 0;
661         int needs_100_continue = 0;
662         struct rpc_in_data rpc_in_data;
663
664         /* Try to load the entire request, if we can fit it into the
665          * allocated buffer space we can use HTTP/1.0 and avoid the
666          * chunked encoding mess.
667          */
668         while (1) {
669                 size_t left = rpc->alloc - rpc->len;
670                 char *buf = rpc->buf + rpc->len;
671                 int n;
672
673                 if (left < LARGE_PACKET_MAX) {
674                         large_request = 1;
675                         use_gzip = 0;
676                         break;
677                 }
678
679                 n = packet_read(rpc->out, NULL, NULL, buf, left, 0);
680                 if (!n)
681                         break;
682                 rpc->len += n;
683         }
684
685         if (large_request) {
686                 struct slot_results results;
687
688                 do {
689                         err = probe_rpc(rpc, &results);
690                         if (err == HTTP_REAUTH)
691                                 credential_fill(&http_auth);
692                 } while (err == HTTP_REAUTH);
693                 if (err != HTTP_OK)
694                         return -1;
695
696                 if (results.auth_avail & CURLAUTH_GSSNEGOTIATE)
697                         needs_100_continue = 1;
698         }
699
700         headers = curl_slist_append(headers, rpc->hdr_content_type);
701         headers = curl_slist_append(headers, rpc->hdr_accept);
702         headers = curl_slist_append(headers, needs_100_continue ?
703                 "Expect: 100-continue" : "Expect:");
704
705         /* Add the extra Git-Protocol header */
706         if (rpc->protocol_header)
707                 headers = curl_slist_append(headers, rpc->protocol_header);
708
709 retry:
710         slot = get_active_slot();
711
712         curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
713         curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
714         curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
715         curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "");
716
717         if (large_request) {
718                 /* The request body is large and the size cannot be predicted.
719                  * We must use chunked encoding to send it.
720                  */
721                 headers = curl_slist_append(headers, "Transfer-Encoding: chunked");
722                 rpc->initial_buffer = 1;
723                 curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, rpc_out);
724                 curl_easy_setopt(slot->curl, CURLOPT_INFILE, rpc);
725 #ifndef NO_CURL_IOCTL
726                 curl_easy_setopt(slot->curl, CURLOPT_IOCTLFUNCTION, rpc_ioctl);
727                 curl_easy_setopt(slot->curl, CURLOPT_IOCTLDATA, rpc);
728 #endif
729                 if (options.verbosity > 1) {
730                         fprintf(stderr, "POST %s (chunked)\n", rpc->service_name);
731                         fflush(stderr);
732                 }
733
734         } else if (gzip_body) {
735                 /*
736                  * If we are looping to retry authentication, then the previous
737                  * run will have set up the headers and gzip buffer already,
738                  * and we just need to send it.
739                  */
740                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);
741                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE_LARGE, xcurl_off_t(gzip_size));
742
743         } else if (use_gzip && 1024 < rpc->len) {
744                 /* The client backend isn't giving us compressed data so
745                  * we can try to deflate it ourselves, this may save on
746                  * the transfer time.
747                  */
748                 git_zstream stream;
749                 int ret;
750
751                 git_deflate_init_gzip(&stream, Z_BEST_COMPRESSION);
752                 gzip_size = git_deflate_bound(&stream, rpc->len);
753                 gzip_body = xmalloc(gzip_size);
754
755                 stream.next_in = (unsigned char *)rpc->buf;
756                 stream.avail_in = rpc->len;
757                 stream.next_out = (unsigned char *)gzip_body;
758                 stream.avail_out = gzip_size;
759
760                 ret = git_deflate(&stream, Z_FINISH);
761                 if (ret != Z_STREAM_END)
762                         die("cannot deflate request; zlib deflate error %d", ret);
763
764                 ret = git_deflate_end_gently(&stream);
765                 if (ret != Z_OK)
766                         die("cannot deflate request; zlib end error %d", ret);
767
768                 gzip_size = stream.total_out;
769
770                 headers = curl_slist_append(headers, "Content-Encoding: gzip");
771                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);
772                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE_LARGE, xcurl_off_t(gzip_size));
773
774                 if (options.verbosity > 1) {
775                         fprintf(stderr, "POST %s (gzip %lu to %lu bytes)\n",
776                                 rpc->service_name,
777                                 (unsigned long)rpc->len, (unsigned long)gzip_size);
778                         fflush(stderr);
779                 }
780         } else {
781                 /* We know the complete request size in advance, use the
782                  * more normal Content-Length approach.
783                  */
784                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, rpc->buf);
785                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE_LARGE, xcurl_off_t(rpc->len));
786                 if (options.verbosity > 1) {
787                         fprintf(stderr, "POST %s (%lu bytes)\n",
788                                 rpc->service_name, (unsigned long)rpc->len);
789                         fflush(stderr);
790                 }
791         }
792
793         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
794         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, rpc_in);
795         rpc_in_data.rpc = rpc;
796         rpc_in_data.slot = slot;
797         curl_easy_setopt(slot->curl, CURLOPT_FILE, &rpc_in_data);
798         curl_easy_setopt(slot->curl, CURLOPT_FAILONERROR, 0);
799
800
801         rpc->any_written = 0;
802         err = run_slot(slot, NULL);
803         if (err == HTTP_REAUTH && !large_request) {
804                 credential_fill(&http_auth);
805                 goto retry;
806         }
807         if (err != HTTP_OK)
808                 err = -1;
809
810         if (!rpc->any_written)
811                 err = -1;
812
813         curl_slist_free_all(headers);
814         free(gzip_body);
815         return err;
816 }
817
818 static int rpc_service(struct rpc_state *rpc, struct discovery *heads)
819 {
820         const char *svc = rpc->service_name;
821         struct strbuf buf = STRBUF_INIT;
822         struct strbuf *preamble = rpc->stdin_preamble;
823         struct child_process client = CHILD_PROCESS_INIT;
824         int err = 0;
825
826         client.in = -1;
827         client.out = -1;
828         client.git_cmd = 1;
829         client.argv = rpc->argv;
830         if (start_command(&client))
831                 exit(1);
832         if (preamble)
833                 write_or_die(client.in, preamble->buf, preamble->len);
834         if (heads)
835                 write_or_die(client.in, heads->buf, heads->len);
836
837         rpc->alloc = http_post_buffer;
838         rpc->buf = xmalloc(rpc->alloc);
839         rpc->in = client.in;
840         rpc->out = client.out;
841         strbuf_init(&rpc->result, 0);
842
843         strbuf_addf(&buf, "%s%s", url.buf, svc);
844         rpc->service_url = strbuf_detach(&buf, NULL);
845
846         strbuf_addf(&buf, "Content-Type: application/x-%s-request", svc);
847         rpc->hdr_content_type = strbuf_detach(&buf, NULL);
848
849         strbuf_addf(&buf, "Accept: application/x-%s-result", svc);
850         rpc->hdr_accept = strbuf_detach(&buf, NULL);
851
852         if (get_protocol_http_header(heads->version, &buf))
853                 rpc->protocol_header = strbuf_detach(&buf, NULL);
854         else
855                 rpc->protocol_header = NULL;
856
857         while (!err) {
858                 int n = packet_read(rpc->out, NULL, NULL, rpc->buf, rpc->alloc, 0);
859                 if (!n)
860                         break;
861                 rpc->pos = 0;
862                 rpc->len = n;
863                 err |= post_rpc(rpc);
864         }
865
866         close(client.in);
867         client.in = -1;
868         if (!err) {
869                 strbuf_read(&rpc->result, client.out, 0);
870         } else {
871                 char buf[4096];
872                 for (;;)
873                         if (xread(client.out, buf, sizeof(buf)) <= 0)
874                                 break;
875         }
876
877         close(client.out);
878         client.out = -1;
879
880         err |= finish_command(&client);
881         free(rpc->service_url);
882         free(rpc->hdr_content_type);
883         free(rpc->hdr_accept);
884         free(rpc->protocol_header);
885         free(rpc->buf);
886         strbuf_release(&buf);
887         return err;
888 }
889
890 static int fetch_dumb(int nr_heads, struct ref **to_fetch)
891 {
892         struct walker *walker;
893         char **targets;
894         int ret, i;
895
896         ALLOC_ARRAY(targets, nr_heads);
897         if (options.depth || options.deepen_since)
898                 die("dumb http transport does not support shallow capabilities");
899         for (i = 0; i < nr_heads; i++)
900                 targets[i] = xstrdup(oid_to_hex(&to_fetch[i]->old_oid));
901
902         walker = get_http_walker(url.buf);
903         walker->get_verbosely = options.verbosity >= 3;
904         walker->get_recover = 0;
905         ret = walker_fetch(walker, nr_heads, targets, NULL, NULL);
906         walker_free(walker);
907
908         for (i = 0; i < nr_heads; i++)
909                 free(targets[i]);
910         free(targets);
911
912         return ret ? error("fetch failed.") : 0;
913 }
914
915 static int fetch_git(struct discovery *heads,
916         int nr_heads, struct ref **to_fetch)
917 {
918         struct rpc_state rpc;
919         struct strbuf preamble = STRBUF_INIT;
920         int i, err;
921         struct argv_array args = ARGV_ARRAY_INIT;
922
923         argv_array_pushl(&args, "fetch-pack", "--stateless-rpc",
924                          "--stdin", "--lock-pack", NULL);
925         if (options.followtags)
926                 argv_array_push(&args, "--include-tag");
927         if (options.thin)
928                 argv_array_push(&args, "--thin");
929         if (options.verbosity >= 3)
930                 argv_array_pushl(&args, "-v", "-v", NULL);
931         if (options.check_self_contained_and_connected)
932                 argv_array_push(&args, "--check-self-contained-and-connected");
933         if (options.cloning)
934                 argv_array_push(&args, "--cloning");
935         if (options.update_shallow)
936                 argv_array_push(&args, "--update-shallow");
937         if (!options.progress)
938                 argv_array_push(&args, "--no-progress");
939         if (options.depth)
940                 argv_array_pushf(&args, "--depth=%lu", options.depth);
941         if (options.deepen_since)
942                 argv_array_pushf(&args, "--shallow-since=%s", options.deepen_since);
943         for (i = 0; i < options.deepen_not.nr; i++)
944                 argv_array_pushf(&args, "--shallow-exclude=%s",
945                                  options.deepen_not.items[i].string);
946         if (options.deepen_relative && options.depth)
947                 argv_array_push(&args, "--deepen-relative");
948         if (options.from_promisor)
949                 argv_array_push(&args, "--from-promisor");
950         if (options.no_dependents)
951                 argv_array_push(&args, "--no-dependents");
952         if (options.filter)
953                 argv_array_pushf(&args, "--filter=%s", options.filter);
954         argv_array_push(&args, url.buf);
955
956         for (i = 0; i < nr_heads; i++) {
957                 struct ref *ref = to_fetch[i];
958                 if (!*ref->name)
959                         die("cannot fetch by sha1 over smart http");
960                 packet_buf_write(&preamble, "%s %s\n",
961                                  oid_to_hex(&ref->old_oid), ref->name);
962         }
963         packet_buf_flush(&preamble);
964
965         memset(&rpc, 0, sizeof(rpc));
966         rpc.service_name = "git-upload-pack",
967         rpc.argv = args.argv;
968         rpc.stdin_preamble = &preamble;
969         rpc.gzip_request = 1;
970
971         err = rpc_service(&rpc, heads);
972         if (rpc.result.len)
973                 write_or_die(1, rpc.result.buf, rpc.result.len);
974         strbuf_release(&rpc.result);
975         strbuf_release(&preamble);
976         argv_array_clear(&args);
977         return err;
978 }
979
980 static int fetch(int nr_heads, struct ref **to_fetch)
981 {
982         struct discovery *d = discover_refs("git-upload-pack", 0);
983         if (d->proto_git)
984                 return fetch_git(d, nr_heads, to_fetch);
985         else
986                 return fetch_dumb(nr_heads, to_fetch);
987 }
988
989 static void parse_fetch(struct strbuf *buf)
990 {
991         struct ref **to_fetch = NULL;
992         struct ref *list_head = NULL;
993         struct ref **list = &list_head;
994         int alloc_heads = 0, nr_heads = 0;
995
996         do {
997                 const char *p;
998                 if (skip_prefix(buf->buf, "fetch ", &p)) {
999                         const char *name;
1000                         struct ref *ref;
1001                         struct object_id old_oid;
1002
1003                         if (get_oid_hex(p, &old_oid))
1004                                 die("protocol error: expected sha/ref, got %s'", p);
1005                         if (p[GIT_SHA1_HEXSZ] == ' ')
1006                                 name = p + GIT_SHA1_HEXSZ + 1;
1007                         else if (!p[GIT_SHA1_HEXSZ])
1008                                 name = "";
1009                         else
1010                                 die("protocol error: expected sha/ref, got %s'", p);
1011
1012                         ref = alloc_ref(name);
1013                         oidcpy(&ref->old_oid, &old_oid);
1014
1015                         *list = ref;
1016                         list = &ref->next;
1017
1018                         ALLOC_GROW(to_fetch, nr_heads + 1, alloc_heads);
1019                         to_fetch[nr_heads++] = ref;
1020                 }
1021                 else
1022                         die("http transport does not support %s", buf->buf);
1023
1024                 strbuf_reset(buf);
1025                 if (strbuf_getline_lf(buf, stdin) == EOF)
1026                         return;
1027                 if (!*buf->buf)
1028                         break;
1029         } while (1);
1030
1031         if (fetch(nr_heads, to_fetch))
1032                 exit(128); /* error already reported */
1033         free_refs(list_head);
1034         free(to_fetch);
1035
1036         printf("\n");
1037         fflush(stdout);
1038         strbuf_reset(buf);
1039 }
1040
1041 static int push_dav(int nr_spec, char **specs)
1042 {
1043         struct child_process child = CHILD_PROCESS_INIT;
1044         size_t i;
1045
1046         child.git_cmd = 1;
1047         argv_array_push(&child.args, "http-push");
1048         argv_array_push(&child.args, "--helper-status");
1049         if (options.dry_run)
1050                 argv_array_push(&child.args, "--dry-run");
1051         if (options.verbosity > 1)
1052                 argv_array_push(&child.args, "--verbose");
1053         argv_array_push(&child.args, url.buf);
1054         for (i = 0; i < nr_spec; i++)
1055                 argv_array_push(&child.args, specs[i]);
1056
1057         if (run_command(&child))
1058                 die("git-http-push failed");
1059         return 0;
1060 }
1061
1062 static int push_git(struct discovery *heads, int nr_spec, char **specs)
1063 {
1064         struct rpc_state rpc;
1065         int i, err;
1066         struct argv_array args;
1067         struct string_list_item *cas_option;
1068         struct strbuf preamble = STRBUF_INIT;
1069
1070         argv_array_init(&args);
1071         argv_array_pushl(&args, "send-pack", "--stateless-rpc", "--helper-status",
1072                          NULL);
1073
1074         if (options.thin)
1075                 argv_array_push(&args, "--thin");
1076         if (options.dry_run)
1077                 argv_array_push(&args, "--dry-run");
1078         if (options.push_cert == SEND_PACK_PUSH_CERT_ALWAYS)
1079                 argv_array_push(&args, "--signed=yes");
1080         else if (options.push_cert == SEND_PACK_PUSH_CERT_IF_ASKED)
1081                 argv_array_push(&args, "--signed=if-asked");
1082         if (options.verbosity == 0)
1083                 argv_array_push(&args, "--quiet");
1084         else if (options.verbosity > 1)
1085                 argv_array_push(&args, "--verbose");
1086         for (i = 0; i < options.push_options.nr; i++)
1087                 argv_array_pushf(&args, "--push-option=%s",
1088                                  options.push_options.items[i].string);
1089         argv_array_push(&args, options.progress ? "--progress" : "--no-progress");
1090         for_each_string_list_item(cas_option, &cas_options)
1091                 argv_array_push(&args, cas_option->string);
1092         argv_array_push(&args, url.buf);
1093
1094         argv_array_push(&args, "--stdin");
1095         for (i = 0; i < nr_spec; i++)
1096                 packet_buf_write(&preamble, "%s\n", specs[i]);
1097         packet_buf_flush(&preamble);
1098
1099         memset(&rpc, 0, sizeof(rpc));
1100         rpc.service_name = "git-receive-pack",
1101         rpc.argv = args.argv;
1102         rpc.stdin_preamble = &preamble;
1103
1104         err = rpc_service(&rpc, heads);
1105         if (rpc.result.len)
1106                 write_or_die(1, rpc.result.buf, rpc.result.len);
1107         strbuf_release(&rpc.result);
1108         strbuf_release(&preamble);
1109         argv_array_clear(&args);
1110         return err;
1111 }
1112
1113 static int push(int nr_spec, char **specs)
1114 {
1115         struct discovery *heads = discover_refs("git-receive-pack", 1);
1116         int ret;
1117
1118         if (heads->proto_git)
1119                 ret = push_git(heads, nr_spec, specs);
1120         else
1121                 ret = push_dav(nr_spec, specs);
1122         free_discovery(heads);
1123         return ret;
1124 }
1125
1126 static void parse_push(struct strbuf *buf)
1127 {
1128         char **specs = NULL;
1129         int alloc_spec = 0, nr_spec = 0, i, ret;
1130
1131         do {
1132                 if (starts_with(buf->buf, "push ")) {
1133                         ALLOC_GROW(specs, nr_spec + 1, alloc_spec);
1134                         specs[nr_spec++] = xstrdup(buf->buf + 5);
1135                 }
1136                 else
1137                         die("http transport does not support %s", buf->buf);
1138
1139                 strbuf_reset(buf);
1140                 if (strbuf_getline_lf(buf, stdin) == EOF)
1141                         goto free_specs;
1142                 if (!*buf->buf)
1143                         break;
1144         } while (1);
1145
1146         ret = push(nr_spec, specs);
1147         printf("\n");
1148         fflush(stdout);
1149
1150         if (ret)
1151                 exit(128); /* error already reported */
1152
1153  free_specs:
1154         for (i = 0; i < nr_spec; i++)
1155                 free(specs[i]);
1156         free(specs);
1157 }
1158
1159 /*
1160  * Used to represent the state of a connection to an HTTP server when
1161  * communicating using git's wire-protocol version 2.
1162  */
1163 struct proxy_state {
1164         char *service_name;
1165         char *service_url;
1166         struct curl_slist *headers;
1167         struct strbuf request_buffer;
1168         int in;
1169         int out;
1170         struct packet_reader reader;
1171         size_t pos;
1172         int seen_flush;
1173 };
1174
1175 static void proxy_state_init(struct proxy_state *p, const char *service_name,
1176                              enum protocol_version version)
1177 {
1178         struct strbuf buf = STRBUF_INIT;
1179
1180         memset(p, 0, sizeof(*p));
1181         p->service_name = xstrdup(service_name);
1182
1183         p->in = 0;
1184         p->out = 1;
1185         strbuf_init(&p->request_buffer, 0);
1186
1187         strbuf_addf(&buf, "%s%s", url.buf, p->service_name);
1188         p->service_url = strbuf_detach(&buf, NULL);
1189
1190         p->headers = http_copy_default_headers();
1191
1192         strbuf_addf(&buf, "Content-Type: application/x-%s-request", p->service_name);
1193         p->headers = curl_slist_append(p->headers, buf.buf);
1194         strbuf_reset(&buf);
1195
1196         strbuf_addf(&buf, "Accept: application/x-%s-result", p->service_name);
1197         p->headers = curl_slist_append(p->headers, buf.buf);
1198         strbuf_reset(&buf);
1199
1200         p->headers = curl_slist_append(p->headers, "Transfer-Encoding: chunked");
1201
1202         /* Add the Git-Protocol header */
1203         if (get_protocol_http_header(version, &buf))
1204                 p->headers = curl_slist_append(p->headers, buf.buf);
1205
1206         packet_reader_init(&p->reader, p->in, NULL, 0,
1207                            PACKET_READ_GENTLE_ON_EOF |
1208                            PACKET_READ_DIE_ON_ERR_PACKET);
1209
1210         strbuf_release(&buf);
1211 }
1212
1213 static void proxy_state_clear(struct proxy_state *p)
1214 {
1215         free(p->service_name);
1216         free(p->service_url);
1217         curl_slist_free_all(p->headers);
1218         strbuf_release(&p->request_buffer);
1219 }
1220
1221 /*
1222  * CURLOPT_READFUNCTION callback function.
1223  * Attempts to copy over a single packet-line at a time into the
1224  * curl provided buffer.
1225  */
1226 static size_t proxy_in(char *buffer, size_t eltsize,
1227                        size_t nmemb, void *userdata)
1228 {
1229         size_t max;
1230         struct proxy_state *p = userdata;
1231         size_t avail = p->request_buffer.len - p->pos;
1232
1233
1234         if (eltsize != 1)
1235                 BUG("curl read callback called with size = %"PRIuMAX" != 1",
1236                     (uintmax_t)eltsize);
1237         max = nmemb;
1238
1239         if (!avail) {
1240                 if (p->seen_flush) {
1241                         p->seen_flush = 0;
1242                         return 0;
1243                 }
1244
1245                 strbuf_reset(&p->request_buffer);
1246                 switch (packet_reader_read(&p->reader)) {
1247                 case PACKET_READ_EOF:
1248                         die("unexpected EOF when reading from parent process");
1249                 case PACKET_READ_NORMAL:
1250                         packet_buf_write_len(&p->request_buffer, p->reader.line,
1251                                              p->reader.pktlen);
1252                         break;
1253                 case PACKET_READ_DELIM:
1254                         packet_buf_delim(&p->request_buffer);
1255                         break;
1256                 case PACKET_READ_FLUSH:
1257                         packet_buf_flush(&p->request_buffer);
1258                         p->seen_flush = 1;
1259                         break;
1260                 }
1261                 p->pos = 0;
1262                 avail = p->request_buffer.len;
1263         }
1264
1265         if (max < avail)
1266                 avail = max;
1267         memcpy(buffer, p->request_buffer.buf + p->pos, avail);
1268         p->pos += avail;
1269         return avail;
1270 }
1271
1272 static size_t proxy_out(char *buffer, size_t eltsize,
1273                         size_t nmemb, void *userdata)
1274 {
1275         size_t size;
1276         struct proxy_state *p = userdata;
1277
1278         if (eltsize != 1)
1279                 BUG("curl read callback called with size = %"PRIuMAX" != 1",
1280                     (uintmax_t)eltsize);
1281         size = nmemb;
1282
1283         write_or_die(p->out, buffer, size);
1284         return size;
1285 }
1286
1287 /* Issues a request to the HTTP server configured in `p` */
1288 static int proxy_request(struct proxy_state *p)
1289 {
1290         struct active_request_slot *slot;
1291
1292         slot = get_active_slot();
1293
1294         curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "");
1295         curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
1296         curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
1297         curl_easy_setopt(slot->curl, CURLOPT_URL, p->service_url);
1298         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, p->headers);
1299
1300         /* Setup function to read request from client */
1301         curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, proxy_in);
1302         curl_easy_setopt(slot->curl, CURLOPT_READDATA, p);
1303
1304         /* Setup function to write server response to client */
1305         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, proxy_out);
1306         curl_easy_setopt(slot->curl, CURLOPT_WRITEDATA, p);
1307
1308         if (run_slot(slot, NULL) != HTTP_OK)
1309                 return -1;
1310
1311         return 0;
1312 }
1313
1314 static int stateless_connect(const char *service_name)
1315 {
1316         struct discovery *discover;
1317         struct proxy_state p;
1318
1319         /*
1320          * Run the info/refs request and see if the server supports protocol
1321          * v2.  If and only if the server supports v2 can we successfully
1322          * establish a stateless connection, otherwise we need to tell the
1323          * client to fallback to using other transport helper functions to
1324          * complete their request.
1325          */
1326         discover = discover_refs(service_name, 0);
1327         if (discover->version != protocol_v2) {
1328                 printf("fallback\n");
1329                 fflush(stdout);
1330                 return -1;
1331         } else {
1332                 /* Stateless Connection established */
1333                 printf("\n");
1334                 fflush(stdout);
1335         }
1336
1337         proxy_state_init(&p, service_name, discover->version);
1338
1339         /*
1340          * Dump the capability listing that we got from the server earlier
1341          * during the info/refs request.
1342          */
1343         write_or_die(p.out, discover->buf, discover->len);
1344
1345         /* Peek the next packet line.  Until we see EOF keep sending POSTs */
1346         while (packet_reader_peek(&p.reader) != PACKET_READ_EOF) {
1347                 if (proxy_request(&p)) {
1348                         /* We would have an err here */
1349                         break;
1350                 }
1351         }
1352
1353         proxy_state_clear(&p);
1354         return 0;
1355 }
1356
1357 int cmd_main(int argc, const char **argv)
1358 {
1359         struct strbuf buf = STRBUF_INIT;
1360         int nongit;
1361
1362         setup_git_directory_gently(&nongit);
1363         if (argc < 2) {
1364                 error("remote-curl: usage: git remote-curl <remote> [<url>]");
1365                 return 1;
1366         }
1367
1368         options.verbosity = 1;
1369         options.progress = !!isatty(2);
1370         options.thin = 1;
1371         string_list_init(&options.deepen_not, 1);
1372         string_list_init(&options.push_options, 1);
1373
1374         remote = remote_get(argv[1]);
1375
1376         if (argc > 2) {
1377                 end_url_with_slash(&url, argv[2]);
1378         } else {
1379                 end_url_with_slash(&url, remote->url[0]);
1380         }
1381
1382         http_init(remote, url.buf, 0);
1383
1384         do {
1385                 const char *arg;
1386
1387                 if (strbuf_getline_lf(&buf, stdin) == EOF) {
1388                         if (ferror(stdin))
1389                                 error("remote-curl: error reading command stream from git");
1390                         return 1;
1391                 }
1392                 if (buf.len == 0)
1393                         break;
1394                 if (starts_with(buf.buf, "fetch ")) {
1395                         if (nongit)
1396                                 die("remote-curl: fetch attempted without a local repo");
1397                         parse_fetch(&buf);
1398
1399                 } else if (!strcmp(buf.buf, "list") || starts_with(buf.buf, "list ")) {
1400                         int for_push = !!strstr(buf.buf + 4, "for-push");
1401                         output_refs(get_refs(for_push));
1402
1403                 } else if (starts_with(buf.buf, "push ")) {
1404                         parse_push(&buf);
1405
1406                 } else if (skip_prefix(buf.buf, "option ", &arg)) {
1407                         char *value = strchr(arg, ' ');
1408                         int result;
1409
1410                         if (value)
1411                                 *value++ = '\0';
1412                         else
1413                                 value = "true";
1414
1415                         result = set_option(arg, value);
1416                         if (!result)
1417                                 printf("ok\n");
1418                         else if (result < 0)
1419                                 printf("error invalid value\n");
1420                         else
1421                                 printf("unsupported\n");
1422                         fflush(stdout);
1423
1424                 } else if (!strcmp(buf.buf, "capabilities")) {
1425                         printf("stateless-connect\n");
1426                         printf("fetch\n");
1427                         printf("option\n");
1428                         printf("push\n");
1429                         printf("check-connectivity\n");
1430                         printf("\n");
1431                         fflush(stdout);
1432                 } else if (skip_prefix(buf.buf, "stateless-connect ", &arg)) {
1433                         if (!stateless_connect(arg))
1434                                 break;
1435                 } else {
1436                         error("remote-curl: unknown command '%s' from git", buf.buf);
1437                         return 1;
1438                 }
1439                 strbuf_reset(&buf);
1440         } while (1);
1441
1442         http_cleanup();
1443
1444         return 0;
1445 }