Merge branch 'jt/fetch-v2-sideband'
[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 void check_smart_http(struct discovery *d, const char *service,
335                              struct strbuf *type)
336 {
337         const char *p;
338         struct packet_reader reader;
339
340         /*
341          * If we don't see x-$service-advertisement, then it's not smart-http.
342          * But once we do, we commit to it and assume any other protocol
343          * violations are hard errors.
344          */
345         if (!skip_prefix(type->buf, "application/x-", &p) ||
346             !skip_prefix(p, service, &p) ||
347             strcmp(p, "-advertisement"))
348                 return;
349
350         packet_reader_init(&reader, -1, d->buf, d->len,
351                            PACKET_READ_CHOMP_NEWLINE |
352                            PACKET_READ_DIE_ON_ERR_PACKET);
353         if (packet_reader_read(&reader) != PACKET_READ_NORMAL)
354                 die("invalid server response; expected service, got flush packet");
355
356         if (skip_prefix(reader.line, "# service=", &p) && !strcmp(p, service)) {
357                 /*
358                  * The header can include additional metadata lines, up
359                  * until a packet flush marker.  Ignore these now, but
360                  * in the future we might start to scan them.
361                  */
362                 for (;;) {
363                         packet_reader_read(&reader);
364                         if (reader.pktlen <= 0) {
365                                 break;
366                         }
367                 }
368
369                 /*
370                  * v0 smart http; callers expect us to soak up the
371                  * service and header packets
372                  */
373                 d->buf = reader.src_buffer;
374                 d->len = reader.src_len;
375                 d->proto_git = 1;
376
377         } else if (!strcmp(reader.line, "version 2")) {
378                 /*
379                  * v2 smart http; do not consume version packet, which will
380                  * be handled elsewhere.
381                  */
382                 d->proto_git = 1;
383
384         } else {
385                 die("invalid server response; got '%s'", reader.line);
386         }
387 }
388
389 static struct discovery *discover_refs(const char *service, int for_push)
390 {
391         struct strbuf type = STRBUF_INIT;
392         struct strbuf charset = STRBUF_INIT;
393         struct strbuf buffer = STRBUF_INIT;
394         struct strbuf refs_url = STRBUF_INIT;
395         struct strbuf effective_url = STRBUF_INIT;
396         struct strbuf protocol_header = STRBUF_INIT;
397         struct string_list extra_headers = STRING_LIST_INIT_DUP;
398         struct discovery *last = last_discovery;
399         int http_ret, maybe_smart = 0;
400         struct http_get_options http_options;
401         enum protocol_version version = get_protocol_version_config();
402
403         if (last && !strcmp(service, last->service))
404                 return last;
405         free_discovery(last);
406
407         strbuf_addf(&refs_url, "%sinfo/refs", url.buf);
408         if ((starts_with(url.buf, "http://") || starts_with(url.buf, "https://")) &&
409              git_env_bool("GIT_SMART_HTTP", 1)) {
410                 maybe_smart = 1;
411                 if (!strchr(url.buf, '?'))
412                         strbuf_addch(&refs_url, '?');
413                 else
414                         strbuf_addch(&refs_url, '&');
415                 strbuf_addf(&refs_url, "service=%s", service);
416         }
417
418         /*
419          * NEEDSWORK: If we are trying to use protocol v2 and we are planning
420          * to perform a push, then fallback to v0 since the client doesn't know
421          * how to push yet using v2.
422          */
423         if (version == protocol_v2 && !strcmp("git-receive-pack", service))
424                 version = protocol_v0;
425
426         /* Add the extra Git-Protocol header */
427         if (get_protocol_http_header(version, &protocol_header))
428                 string_list_append(&extra_headers, protocol_header.buf);
429
430         memset(&http_options, 0, sizeof(http_options));
431         http_options.content_type = &type;
432         http_options.charset = &charset;
433         http_options.effective_url = &effective_url;
434         http_options.base_url = &url;
435         http_options.extra_headers = &extra_headers;
436         http_options.initial_request = 1;
437         http_options.no_cache = 1;
438
439         http_ret = http_get_strbuf(refs_url.buf, &buffer, &http_options);
440         switch (http_ret) {
441         case HTTP_OK:
442                 break;
443         case HTTP_MISSING_TARGET:
444                 show_http_message(&type, &charset, &buffer);
445                 die("repository '%s' not found", url.buf);
446         case HTTP_NOAUTH:
447                 show_http_message(&type, &charset, &buffer);
448                 die("Authentication failed for '%s'", url.buf);
449         default:
450                 show_http_message(&type, &charset, &buffer);
451                 die("unable to access '%s': %s", url.buf, curl_errorstr);
452         }
453
454         if (options.verbosity && !starts_with(refs_url.buf, url.buf))
455                 warning(_("redirecting to %s"), url.buf);
456
457         last= xcalloc(1, sizeof(*last_discovery));
458         last->service = xstrdup(service);
459         last->buf_alloc = strbuf_detach(&buffer, &last->len);
460         last->buf = last->buf_alloc;
461
462         if (maybe_smart)
463                 check_smart_http(last, service, &type);
464
465         if (last->proto_git)
466                 last->refs = parse_git_refs(last, for_push);
467         else
468                 last->refs = parse_info_refs(last);
469
470         strbuf_release(&refs_url);
471         strbuf_release(&type);
472         strbuf_release(&charset);
473         strbuf_release(&effective_url);
474         strbuf_release(&buffer);
475         strbuf_release(&protocol_header);
476         string_list_clear(&extra_headers, 0);
477         last_discovery = last;
478         return last;
479 }
480
481 static struct ref *get_refs(int for_push)
482 {
483         struct discovery *heads;
484
485         if (for_push)
486                 heads = discover_refs("git-receive-pack", for_push);
487         else
488                 heads = discover_refs("git-upload-pack", for_push);
489
490         return heads->refs;
491 }
492
493 static void output_refs(struct ref *refs)
494 {
495         struct ref *posn;
496         for (posn = refs; posn; posn = posn->next) {
497                 if (posn->symref)
498                         printf("@%s %s\n", posn->symref, posn->name);
499                 else
500                         printf("%s %s\n", oid_to_hex(&posn->old_oid), posn->name);
501         }
502         printf("\n");
503         fflush(stdout);
504 }
505
506 struct rpc_state {
507         const char *service_name;
508         const char **argv;
509         struct strbuf *stdin_preamble;
510         char *service_url;
511         char *hdr_content_type;
512         char *hdr_accept;
513         char *protocol_header;
514         char *buf;
515         size_t alloc;
516         size_t len;
517         size_t pos;
518         int in;
519         int out;
520         int any_written;
521         struct strbuf result;
522         unsigned gzip_request : 1;
523         unsigned initial_buffer : 1;
524 };
525
526 static size_t rpc_out(void *ptr, size_t eltsize,
527                 size_t nmemb, void *buffer_)
528 {
529         size_t max = eltsize * nmemb;
530         struct rpc_state *rpc = buffer_;
531         size_t avail = rpc->len - rpc->pos;
532
533         if (!avail) {
534                 rpc->initial_buffer = 0;
535                 avail = packet_read(rpc->out, NULL, NULL, rpc->buf, rpc->alloc, 0);
536                 if (!avail)
537                         return 0;
538                 rpc->pos = 0;
539                 rpc->len = avail;
540         }
541
542         if (max < avail)
543                 avail = max;
544         memcpy(ptr, rpc->buf + rpc->pos, avail);
545         rpc->pos += avail;
546         return avail;
547 }
548
549 #ifndef NO_CURL_IOCTL
550 static curlioerr rpc_ioctl(CURL *handle, int cmd, void *clientp)
551 {
552         struct rpc_state *rpc = clientp;
553
554         switch (cmd) {
555         case CURLIOCMD_NOP:
556                 return CURLIOE_OK;
557
558         case CURLIOCMD_RESTARTREAD:
559                 if (rpc->initial_buffer) {
560                         rpc->pos = 0;
561                         return CURLIOE_OK;
562                 }
563                 error("unable to rewind rpc post data - try increasing http.postBuffer");
564                 return CURLIOE_FAILRESTART;
565
566         default:
567                 return CURLIOE_UNKNOWNCMD;
568         }
569 }
570 #endif
571
572 struct rpc_in_data {
573         struct rpc_state *rpc;
574         struct active_request_slot *slot;
575 };
576
577 /*
578  * A callback for CURLOPT_WRITEFUNCTION. The return value is the bytes consumed
579  * from ptr.
580  */
581 static size_t rpc_in(char *ptr, size_t eltsize,
582                 size_t nmemb, void *buffer_)
583 {
584         size_t size = eltsize * nmemb;
585         struct rpc_in_data *data = buffer_;
586         long response_code;
587
588         if (curl_easy_getinfo(data->slot->curl, CURLINFO_RESPONSE_CODE,
589                               &response_code) != CURLE_OK)
590                 return size;
591         if (response_code >= 300)
592                 return size;
593         if (size)
594                 data->rpc->any_written = 1;
595         write_or_die(data->rpc->in, ptr, size);
596         return size;
597 }
598
599 static int run_slot(struct active_request_slot *slot,
600                     struct slot_results *results)
601 {
602         int err;
603         struct slot_results results_buf;
604
605         if (!results)
606                 results = &results_buf;
607
608         err = run_one_slot(slot, results);
609
610         if (err != HTTP_OK && err != HTTP_REAUTH) {
611                 struct strbuf msg = STRBUF_INIT;
612                 if (results->http_code && results->http_code != 200)
613                         strbuf_addf(&msg, "HTTP %ld", results->http_code);
614                 if (results->curl_result != CURLE_OK) {
615                         if (msg.len)
616                                 strbuf_addch(&msg, ' ');
617                         strbuf_addf(&msg, "curl %d", results->curl_result);
618                         if (curl_errorstr[0]) {
619                                 strbuf_addch(&msg, ' ');
620                                 strbuf_addstr(&msg, curl_errorstr);
621                         }
622                 }
623                 error("RPC failed; %s", msg.buf);
624                 strbuf_release(&msg);
625         }
626
627         return err;
628 }
629
630 static int probe_rpc(struct rpc_state *rpc, struct slot_results *results)
631 {
632         struct active_request_slot *slot;
633         struct curl_slist *headers = http_copy_default_headers();
634         struct strbuf buf = STRBUF_INIT;
635         int err;
636
637         slot = get_active_slot();
638
639         headers = curl_slist_append(headers, rpc->hdr_content_type);
640         headers = curl_slist_append(headers, rpc->hdr_accept);
641
642         curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
643         curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
644         curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
645         curl_easy_setopt(slot->curl, CURLOPT_ENCODING, NULL);
646         curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, "0000");
647         curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, 4);
648         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
649         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
650         curl_easy_setopt(slot->curl, CURLOPT_FILE, &buf);
651
652         err = run_slot(slot, results);
653
654         curl_slist_free_all(headers);
655         strbuf_release(&buf);
656         return err;
657 }
658
659 static curl_off_t xcurl_off_t(size_t len)
660 {
661         uintmax_t size = len;
662         if (size > maximum_signed_value_of_type(curl_off_t))
663                 die("cannot handle pushes this big");
664         return (curl_off_t)size;
665 }
666
667 static int post_rpc(struct rpc_state *rpc)
668 {
669         struct active_request_slot *slot;
670         struct curl_slist *headers = http_copy_default_headers();
671         int use_gzip = rpc->gzip_request;
672         char *gzip_body = NULL;
673         size_t gzip_size = 0;
674         int err, large_request = 0;
675         int needs_100_continue = 0;
676         struct rpc_in_data rpc_in_data;
677
678         /* Try to load the entire request, if we can fit it into the
679          * allocated buffer space we can use HTTP/1.0 and avoid the
680          * chunked encoding mess.
681          */
682         while (1) {
683                 size_t left = rpc->alloc - rpc->len;
684                 char *buf = rpc->buf + rpc->len;
685                 int n;
686
687                 if (left < LARGE_PACKET_MAX) {
688                         large_request = 1;
689                         use_gzip = 0;
690                         break;
691                 }
692
693                 n = packet_read(rpc->out, NULL, NULL, buf, left, 0);
694                 if (!n)
695                         break;
696                 rpc->len += n;
697         }
698
699         if (large_request) {
700                 struct slot_results results;
701
702                 do {
703                         err = probe_rpc(rpc, &results);
704                         if (err == HTTP_REAUTH)
705                                 credential_fill(&http_auth);
706                 } while (err == HTTP_REAUTH);
707                 if (err != HTTP_OK)
708                         return -1;
709
710                 if (results.auth_avail & CURLAUTH_GSSNEGOTIATE)
711                         needs_100_continue = 1;
712         }
713
714         headers = curl_slist_append(headers, rpc->hdr_content_type);
715         headers = curl_slist_append(headers, rpc->hdr_accept);
716         headers = curl_slist_append(headers, needs_100_continue ?
717                 "Expect: 100-continue" : "Expect:");
718
719         /* Add the extra Git-Protocol header */
720         if (rpc->protocol_header)
721                 headers = curl_slist_append(headers, rpc->protocol_header);
722
723 retry:
724         slot = get_active_slot();
725
726         curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
727         curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
728         curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
729         curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "");
730
731         if (large_request) {
732                 /* The request body is large and the size cannot be predicted.
733                  * We must use chunked encoding to send it.
734                  */
735                 headers = curl_slist_append(headers, "Transfer-Encoding: chunked");
736                 rpc->initial_buffer = 1;
737                 curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, rpc_out);
738                 curl_easy_setopt(slot->curl, CURLOPT_INFILE, rpc);
739 #ifndef NO_CURL_IOCTL
740                 curl_easy_setopt(slot->curl, CURLOPT_IOCTLFUNCTION, rpc_ioctl);
741                 curl_easy_setopt(slot->curl, CURLOPT_IOCTLDATA, rpc);
742 #endif
743                 if (options.verbosity > 1) {
744                         fprintf(stderr, "POST %s (chunked)\n", rpc->service_name);
745                         fflush(stderr);
746                 }
747
748         } else if (gzip_body) {
749                 /*
750                  * If we are looping to retry authentication, then the previous
751                  * run will have set up the headers and gzip buffer already,
752                  * and we just need to send it.
753                  */
754                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);
755                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE_LARGE, xcurl_off_t(gzip_size));
756
757         } else if (use_gzip && 1024 < rpc->len) {
758                 /* The client backend isn't giving us compressed data so
759                  * we can try to deflate it ourselves, this may save on
760                  * the transfer time.
761                  */
762                 git_zstream stream;
763                 int ret;
764
765                 git_deflate_init_gzip(&stream, Z_BEST_COMPRESSION);
766                 gzip_size = git_deflate_bound(&stream, rpc->len);
767                 gzip_body = xmalloc(gzip_size);
768
769                 stream.next_in = (unsigned char *)rpc->buf;
770                 stream.avail_in = rpc->len;
771                 stream.next_out = (unsigned char *)gzip_body;
772                 stream.avail_out = gzip_size;
773
774                 ret = git_deflate(&stream, Z_FINISH);
775                 if (ret != Z_STREAM_END)
776                         die("cannot deflate request; zlib deflate error %d", ret);
777
778                 ret = git_deflate_end_gently(&stream);
779                 if (ret != Z_OK)
780                         die("cannot deflate request; zlib end error %d", ret);
781
782                 gzip_size = stream.total_out;
783
784                 headers = curl_slist_append(headers, "Content-Encoding: gzip");
785                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);
786                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE_LARGE, xcurl_off_t(gzip_size));
787
788                 if (options.verbosity > 1) {
789                         fprintf(stderr, "POST %s (gzip %lu to %lu bytes)\n",
790                                 rpc->service_name,
791                                 (unsigned long)rpc->len, (unsigned long)gzip_size);
792                         fflush(stderr);
793                 }
794         } else {
795                 /* We know the complete request size in advance, use the
796                  * more normal Content-Length approach.
797                  */
798                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, rpc->buf);
799                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE_LARGE, xcurl_off_t(rpc->len));
800                 if (options.verbosity > 1) {
801                         fprintf(stderr, "POST %s (%lu bytes)\n",
802                                 rpc->service_name, (unsigned long)rpc->len);
803                         fflush(stderr);
804                 }
805         }
806
807         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
808         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, rpc_in);
809         rpc_in_data.rpc = rpc;
810         rpc_in_data.slot = slot;
811         curl_easy_setopt(slot->curl, CURLOPT_FILE, &rpc_in_data);
812         curl_easy_setopt(slot->curl, CURLOPT_FAILONERROR, 0);
813
814
815         rpc->any_written = 0;
816         err = run_slot(slot, NULL);
817         if (err == HTTP_REAUTH && !large_request) {
818                 credential_fill(&http_auth);
819                 goto retry;
820         }
821         if (err != HTTP_OK)
822                 err = -1;
823
824         if (!rpc->any_written)
825                 err = -1;
826
827         curl_slist_free_all(headers);
828         free(gzip_body);
829         return err;
830 }
831
832 static int rpc_service(struct rpc_state *rpc, struct discovery *heads)
833 {
834         const char *svc = rpc->service_name;
835         struct strbuf buf = STRBUF_INIT;
836         struct strbuf *preamble = rpc->stdin_preamble;
837         struct child_process client = CHILD_PROCESS_INIT;
838         int err = 0;
839
840         client.in = -1;
841         client.out = -1;
842         client.git_cmd = 1;
843         client.argv = rpc->argv;
844         if (start_command(&client))
845                 exit(1);
846         if (preamble)
847                 write_or_die(client.in, preamble->buf, preamble->len);
848         if (heads)
849                 write_or_die(client.in, heads->buf, heads->len);
850
851         rpc->alloc = http_post_buffer;
852         rpc->buf = xmalloc(rpc->alloc);
853         rpc->in = client.in;
854         rpc->out = client.out;
855         strbuf_init(&rpc->result, 0);
856
857         strbuf_addf(&buf, "%s%s", url.buf, svc);
858         rpc->service_url = strbuf_detach(&buf, NULL);
859
860         strbuf_addf(&buf, "Content-Type: application/x-%s-request", svc);
861         rpc->hdr_content_type = strbuf_detach(&buf, NULL);
862
863         strbuf_addf(&buf, "Accept: application/x-%s-result", svc);
864         rpc->hdr_accept = strbuf_detach(&buf, NULL);
865
866         if (get_protocol_http_header(heads->version, &buf))
867                 rpc->protocol_header = strbuf_detach(&buf, NULL);
868         else
869                 rpc->protocol_header = NULL;
870
871         while (!err) {
872                 int n = packet_read(rpc->out, NULL, NULL, rpc->buf, rpc->alloc, 0);
873                 if (!n)
874                         break;
875                 rpc->pos = 0;
876                 rpc->len = n;
877                 err |= post_rpc(rpc);
878         }
879
880         close(client.in);
881         client.in = -1;
882         if (!err) {
883                 strbuf_read(&rpc->result, client.out, 0);
884         } else {
885                 char buf[4096];
886                 for (;;)
887                         if (xread(client.out, buf, sizeof(buf)) <= 0)
888                                 break;
889         }
890
891         close(client.out);
892         client.out = -1;
893
894         err |= finish_command(&client);
895         free(rpc->service_url);
896         free(rpc->hdr_content_type);
897         free(rpc->hdr_accept);
898         free(rpc->protocol_header);
899         free(rpc->buf);
900         strbuf_release(&buf);
901         return err;
902 }
903
904 static int fetch_dumb(int nr_heads, struct ref **to_fetch)
905 {
906         struct walker *walker;
907         char **targets;
908         int ret, i;
909
910         ALLOC_ARRAY(targets, nr_heads);
911         if (options.depth || options.deepen_since)
912                 die("dumb http transport does not support shallow capabilities");
913         for (i = 0; i < nr_heads; i++)
914                 targets[i] = xstrdup(oid_to_hex(&to_fetch[i]->old_oid));
915
916         walker = get_http_walker(url.buf);
917         walker->get_verbosely = options.verbosity >= 3;
918         walker->get_recover = 0;
919         ret = walker_fetch(walker, nr_heads, targets, NULL, NULL);
920         walker_free(walker);
921
922         for (i = 0; i < nr_heads; i++)
923                 free(targets[i]);
924         free(targets);
925
926         return ret ? error("fetch failed.") : 0;
927 }
928
929 static int fetch_git(struct discovery *heads,
930         int nr_heads, struct ref **to_fetch)
931 {
932         struct rpc_state rpc;
933         struct strbuf preamble = STRBUF_INIT;
934         int i, err;
935         struct argv_array args = ARGV_ARRAY_INIT;
936
937         argv_array_pushl(&args, "fetch-pack", "--stateless-rpc",
938                          "--stdin", "--lock-pack", NULL);
939         if (options.followtags)
940                 argv_array_push(&args, "--include-tag");
941         if (options.thin)
942                 argv_array_push(&args, "--thin");
943         if (options.verbosity >= 3)
944                 argv_array_pushl(&args, "-v", "-v", NULL);
945         if (options.check_self_contained_and_connected)
946                 argv_array_push(&args, "--check-self-contained-and-connected");
947         if (options.cloning)
948                 argv_array_push(&args, "--cloning");
949         if (options.update_shallow)
950                 argv_array_push(&args, "--update-shallow");
951         if (!options.progress)
952                 argv_array_push(&args, "--no-progress");
953         if (options.depth)
954                 argv_array_pushf(&args, "--depth=%lu", options.depth);
955         if (options.deepen_since)
956                 argv_array_pushf(&args, "--shallow-since=%s", options.deepen_since);
957         for (i = 0; i < options.deepen_not.nr; i++)
958                 argv_array_pushf(&args, "--shallow-exclude=%s",
959                                  options.deepen_not.items[i].string);
960         if (options.deepen_relative && options.depth)
961                 argv_array_push(&args, "--deepen-relative");
962         if (options.from_promisor)
963                 argv_array_push(&args, "--from-promisor");
964         if (options.no_dependents)
965                 argv_array_push(&args, "--no-dependents");
966         if (options.filter)
967                 argv_array_pushf(&args, "--filter=%s", options.filter);
968         argv_array_push(&args, url.buf);
969
970         for (i = 0; i < nr_heads; i++) {
971                 struct ref *ref = to_fetch[i];
972                 if (!*ref->name)
973                         die("cannot fetch by sha1 over smart http");
974                 packet_buf_write(&preamble, "%s %s\n",
975                                  oid_to_hex(&ref->old_oid), ref->name);
976         }
977         packet_buf_flush(&preamble);
978
979         memset(&rpc, 0, sizeof(rpc));
980         rpc.service_name = "git-upload-pack",
981         rpc.argv = args.argv;
982         rpc.stdin_preamble = &preamble;
983         rpc.gzip_request = 1;
984
985         err = rpc_service(&rpc, heads);
986         if (rpc.result.len)
987                 write_or_die(1, rpc.result.buf, rpc.result.len);
988         strbuf_release(&rpc.result);
989         strbuf_release(&preamble);
990         argv_array_clear(&args);
991         return err;
992 }
993
994 static int fetch(int nr_heads, struct ref **to_fetch)
995 {
996         struct discovery *d = discover_refs("git-upload-pack", 0);
997         if (d->proto_git)
998                 return fetch_git(d, nr_heads, to_fetch);
999         else
1000                 return fetch_dumb(nr_heads, to_fetch);
1001 }
1002
1003 static void parse_fetch(struct strbuf *buf)
1004 {
1005         struct ref **to_fetch = NULL;
1006         struct ref *list_head = NULL;
1007         struct ref **list = &list_head;
1008         int alloc_heads = 0, nr_heads = 0;
1009
1010         do {
1011                 const char *p;
1012                 if (skip_prefix(buf->buf, "fetch ", &p)) {
1013                         const char *name;
1014                         struct ref *ref;
1015                         struct object_id old_oid;
1016
1017                         if (get_oid_hex(p, &old_oid))
1018                                 die("protocol error: expected sha/ref, got %s'", p);
1019                         if (p[GIT_SHA1_HEXSZ] == ' ')
1020                                 name = p + GIT_SHA1_HEXSZ + 1;
1021                         else if (!p[GIT_SHA1_HEXSZ])
1022                                 name = "";
1023                         else
1024                                 die("protocol error: expected sha/ref, got %s'", p);
1025
1026                         ref = alloc_ref(name);
1027                         oidcpy(&ref->old_oid, &old_oid);
1028
1029                         *list = ref;
1030                         list = &ref->next;
1031
1032                         ALLOC_GROW(to_fetch, nr_heads + 1, alloc_heads);
1033                         to_fetch[nr_heads++] = ref;
1034                 }
1035                 else
1036                         die("http transport does not support %s", buf->buf);
1037
1038                 strbuf_reset(buf);
1039                 if (strbuf_getline_lf(buf, stdin) == EOF)
1040                         return;
1041                 if (!*buf->buf)
1042                         break;
1043         } while (1);
1044
1045         if (fetch(nr_heads, to_fetch))
1046                 exit(128); /* error already reported */
1047         free_refs(list_head);
1048         free(to_fetch);
1049
1050         printf("\n");
1051         fflush(stdout);
1052         strbuf_reset(buf);
1053 }
1054
1055 static int push_dav(int nr_spec, char **specs)
1056 {
1057         struct child_process child = CHILD_PROCESS_INIT;
1058         size_t i;
1059
1060         child.git_cmd = 1;
1061         argv_array_push(&child.args, "http-push");
1062         argv_array_push(&child.args, "--helper-status");
1063         if (options.dry_run)
1064                 argv_array_push(&child.args, "--dry-run");
1065         if (options.verbosity > 1)
1066                 argv_array_push(&child.args, "--verbose");
1067         argv_array_push(&child.args, url.buf);
1068         for (i = 0; i < nr_spec; i++)
1069                 argv_array_push(&child.args, specs[i]);
1070
1071         if (run_command(&child))
1072                 die("git-http-push failed");
1073         return 0;
1074 }
1075
1076 static int push_git(struct discovery *heads, int nr_spec, char **specs)
1077 {
1078         struct rpc_state rpc;
1079         int i, err;
1080         struct argv_array args;
1081         struct string_list_item *cas_option;
1082         struct strbuf preamble = STRBUF_INIT;
1083
1084         argv_array_init(&args);
1085         argv_array_pushl(&args, "send-pack", "--stateless-rpc", "--helper-status",
1086                          NULL);
1087
1088         if (options.thin)
1089                 argv_array_push(&args, "--thin");
1090         if (options.dry_run)
1091                 argv_array_push(&args, "--dry-run");
1092         if (options.push_cert == SEND_PACK_PUSH_CERT_ALWAYS)
1093                 argv_array_push(&args, "--signed=yes");
1094         else if (options.push_cert == SEND_PACK_PUSH_CERT_IF_ASKED)
1095                 argv_array_push(&args, "--signed=if-asked");
1096         if (options.verbosity == 0)
1097                 argv_array_push(&args, "--quiet");
1098         else if (options.verbosity > 1)
1099                 argv_array_push(&args, "--verbose");
1100         for (i = 0; i < options.push_options.nr; i++)
1101                 argv_array_pushf(&args, "--push-option=%s",
1102                                  options.push_options.items[i].string);
1103         argv_array_push(&args, options.progress ? "--progress" : "--no-progress");
1104         for_each_string_list_item(cas_option, &cas_options)
1105                 argv_array_push(&args, cas_option->string);
1106         argv_array_push(&args, url.buf);
1107
1108         argv_array_push(&args, "--stdin");
1109         for (i = 0; i < nr_spec; i++)
1110                 packet_buf_write(&preamble, "%s\n", specs[i]);
1111         packet_buf_flush(&preamble);
1112
1113         memset(&rpc, 0, sizeof(rpc));
1114         rpc.service_name = "git-receive-pack",
1115         rpc.argv = args.argv;
1116         rpc.stdin_preamble = &preamble;
1117
1118         err = rpc_service(&rpc, heads);
1119         if (rpc.result.len)
1120                 write_or_die(1, rpc.result.buf, rpc.result.len);
1121         strbuf_release(&rpc.result);
1122         strbuf_release(&preamble);
1123         argv_array_clear(&args);
1124         return err;
1125 }
1126
1127 static int push(int nr_spec, char **specs)
1128 {
1129         struct discovery *heads = discover_refs("git-receive-pack", 1);
1130         int ret;
1131
1132         if (heads->proto_git)
1133                 ret = push_git(heads, nr_spec, specs);
1134         else
1135                 ret = push_dav(nr_spec, specs);
1136         free_discovery(heads);
1137         return ret;
1138 }
1139
1140 static void parse_push(struct strbuf *buf)
1141 {
1142         char **specs = NULL;
1143         int alloc_spec = 0, nr_spec = 0, i, ret;
1144
1145         do {
1146                 if (starts_with(buf->buf, "push ")) {
1147                         ALLOC_GROW(specs, nr_spec + 1, alloc_spec);
1148                         specs[nr_spec++] = xstrdup(buf->buf + 5);
1149                 }
1150                 else
1151                         die("http transport does not support %s", buf->buf);
1152
1153                 strbuf_reset(buf);
1154                 if (strbuf_getline_lf(buf, stdin) == EOF)
1155                         goto free_specs;
1156                 if (!*buf->buf)
1157                         break;
1158         } while (1);
1159
1160         ret = push(nr_spec, specs);
1161         printf("\n");
1162         fflush(stdout);
1163
1164         if (ret)
1165                 exit(128); /* error already reported */
1166
1167  free_specs:
1168         for (i = 0; i < nr_spec; i++)
1169                 free(specs[i]);
1170         free(specs);
1171 }
1172
1173 /*
1174  * Used to represent the state of a connection to an HTTP server when
1175  * communicating using git's wire-protocol version 2.
1176  */
1177 struct proxy_state {
1178         char *service_name;
1179         char *service_url;
1180         struct curl_slist *headers;
1181         struct strbuf request_buffer;
1182         int in;
1183         int out;
1184         struct packet_reader reader;
1185         size_t pos;
1186         int seen_flush;
1187 };
1188
1189 static void proxy_state_init(struct proxy_state *p, const char *service_name,
1190                              enum protocol_version version)
1191 {
1192         struct strbuf buf = STRBUF_INIT;
1193
1194         memset(p, 0, sizeof(*p));
1195         p->service_name = xstrdup(service_name);
1196
1197         p->in = 0;
1198         p->out = 1;
1199         strbuf_init(&p->request_buffer, 0);
1200
1201         strbuf_addf(&buf, "%s%s", url.buf, p->service_name);
1202         p->service_url = strbuf_detach(&buf, NULL);
1203
1204         p->headers = http_copy_default_headers();
1205
1206         strbuf_addf(&buf, "Content-Type: application/x-%s-request", p->service_name);
1207         p->headers = curl_slist_append(p->headers, buf.buf);
1208         strbuf_reset(&buf);
1209
1210         strbuf_addf(&buf, "Accept: application/x-%s-result", p->service_name);
1211         p->headers = curl_slist_append(p->headers, buf.buf);
1212         strbuf_reset(&buf);
1213
1214         p->headers = curl_slist_append(p->headers, "Transfer-Encoding: chunked");
1215
1216         /* Add the Git-Protocol header */
1217         if (get_protocol_http_header(version, &buf))
1218                 p->headers = curl_slist_append(p->headers, buf.buf);
1219
1220         packet_reader_init(&p->reader, p->in, NULL, 0,
1221                            PACKET_READ_GENTLE_ON_EOF |
1222                            PACKET_READ_DIE_ON_ERR_PACKET);
1223
1224         strbuf_release(&buf);
1225 }
1226
1227 static void proxy_state_clear(struct proxy_state *p)
1228 {
1229         free(p->service_name);
1230         free(p->service_url);
1231         curl_slist_free_all(p->headers);
1232         strbuf_release(&p->request_buffer);
1233 }
1234
1235 /*
1236  * CURLOPT_READFUNCTION callback function.
1237  * Attempts to copy over a single packet-line at a time into the
1238  * curl provided buffer.
1239  */
1240 static size_t proxy_in(char *buffer, size_t eltsize,
1241                        size_t nmemb, void *userdata)
1242 {
1243         size_t max;
1244         struct proxy_state *p = userdata;
1245         size_t avail = p->request_buffer.len - p->pos;
1246
1247
1248         if (eltsize != 1)
1249                 BUG("curl read callback called with size = %"PRIuMAX" != 1",
1250                     (uintmax_t)eltsize);
1251         max = nmemb;
1252
1253         if (!avail) {
1254                 if (p->seen_flush) {
1255                         p->seen_flush = 0;
1256                         return 0;
1257                 }
1258
1259                 strbuf_reset(&p->request_buffer);
1260                 switch (packet_reader_read(&p->reader)) {
1261                 case PACKET_READ_EOF:
1262                         die("unexpected EOF when reading from parent process");
1263                 case PACKET_READ_NORMAL:
1264                         packet_buf_write_len(&p->request_buffer, p->reader.line,
1265                                              p->reader.pktlen);
1266                         break;
1267                 case PACKET_READ_DELIM:
1268                         packet_buf_delim(&p->request_buffer);
1269                         break;
1270                 case PACKET_READ_FLUSH:
1271                         packet_buf_flush(&p->request_buffer);
1272                         p->seen_flush = 1;
1273                         break;
1274                 }
1275                 p->pos = 0;
1276                 avail = p->request_buffer.len;
1277         }
1278
1279         if (max < avail)
1280                 avail = max;
1281         memcpy(buffer, p->request_buffer.buf + p->pos, avail);
1282         p->pos += avail;
1283         return avail;
1284 }
1285
1286 static size_t proxy_out(char *buffer, size_t eltsize,
1287                         size_t nmemb, void *userdata)
1288 {
1289         size_t size;
1290         struct proxy_state *p = userdata;
1291
1292         if (eltsize != 1)
1293                 BUG("curl read callback called with size = %"PRIuMAX" != 1",
1294                     (uintmax_t)eltsize);
1295         size = nmemb;
1296
1297         write_or_die(p->out, buffer, size);
1298         return size;
1299 }
1300
1301 /* Issues a request to the HTTP server configured in `p` */
1302 static int proxy_request(struct proxy_state *p)
1303 {
1304         struct active_request_slot *slot;
1305
1306         slot = get_active_slot();
1307
1308         curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "");
1309         curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
1310         curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
1311         curl_easy_setopt(slot->curl, CURLOPT_URL, p->service_url);
1312         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, p->headers);
1313
1314         /* Setup function to read request from client */
1315         curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, proxy_in);
1316         curl_easy_setopt(slot->curl, CURLOPT_READDATA, p);
1317
1318         /* Setup function to write server response to client */
1319         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, proxy_out);
1320         curl_easy_setopt(slot->curl, CURLOPT_WRITEDATA, p);
1321
1322         if (run_slot(slot, NULL) != HTTP_OK)
1323                 return -1;
1324
1325         return 0;
1326 }
1327
1328 static int stateless_connect(const char *service_name)
1329 {
1330         struct discovery *discover;
1331         struct proxy_state p;
1332
1333         /*
1334          * Run the info/refs request and see if the server supports protocol
1335          * v2.  If and only if the server supports v2 can we successfully
1336          * establish a stateless connection, otherwise we need to tell the
1337          * client to fallback to using other transport helper functions to
1338          * complete their request.
1339          */
1340         discover = discover_refs(service_name, 0);
1341         if (discover->version != protocol_v2) {
1342                 printf("fallback\n");
1343                 fflush(stdout);
1344                 return -1;
1345         } else {
1346                 /* Stateless Connection established */
1347                 printf("\n");
1348                 fflush(stdout);
1349         }
1350
1351         proxy_state_init(&p, service_name, discover->version);
1352
1353         /*
1354          * Dump the capability listing that we got from the server earlier
1355          * during the info/refs request.
1356          */
1357         write_or_die(p.out, discover->buf, discover->len);
1358
1359         /* Peek the next packet line.  Until we see EOF keep sending POSTs */
1360         while (packet_reader_peek(&p.reader) != PACKET_READ_EOF) {
1361                 if (proxy_request(&p)) {
1362                         /* We would have an err here */
1363                         break;
1364                 }
1365         }
1366
1367         proxy_state_clear(&p);
1368         return 0;
1369 }
1370
1371 int cmd_main(int argc, const char **argv)
1372 {
1373         struct strbuf buf = STRBUF_INIT;
1374         int nongit;
1375
1376         setup_git_directory_gently(&nongit);
1377         if (argc < 2) {
1378                 error("remote-curl: usage: git remote-curl <remote> [<url>]");
1379                 return 1;
1380         }
1381
1382         options.verbosity = 1;
1383         options.progress = !!isatty(2);
1384         options.thin = 1;
1385         string_list_init(&options.deepen_not, 1);
1386         string_list_init(&options.push_options, 1);
1387
1388         remote = remote_get(argv[1]);
1389
1390         if (argc > 2) {
1391                 end_url_with_slash(&url, argv[2]);
1392         } else {
1393                 end_url_with_slash(&url, remote->url[0]);
1394         }
1395
1396         http_init(remote, url.buf, 0);
1397
1398         do {
1399                 const char *arg;
1400
1401                 if (strbuf_getline_lf(&buf, stdin) == EOF) {
1402                         if (ferror(stdin))
1403                                 error("remote-curl: error reading command stream from git");
1404                         return 1;
1405                 }
1406                 if (buf.len == 0)
1407                         break;
1408                 if (starts_with(buf.buf, "fetch ")) {
1409                         if (nongit)
1410                                 die("remote-curl: fetch attempted without a local repo");
1411                         parse_fetch(&buf);
1412
1413                 } else if (!strcmp(buf.buf, "list") || starts_with(buf.buf, "list ")) {
1414                         int for_push = !!strstr(buf.buf + 4, "for-push");
1415                         output_refs(get_refs(for_push));
1416
1417                 } else if (starts_with(buf.buf, "push ")) {
1418                         parse_push(&buf);
1419
1420                 } else if (skip_prefix(buf.buf, "option ", &arg)) {
1421                         char *value = strchr(arg, ' ');
1422                         int result;
1423
1424                         if (value)
1425                                 *value++ = '\0';
1426                         else
1427                                 value = "true";
1428
1429                         result = set_option(arg, value);
1430                         if (!result)
1431                                 printf("ok\n");
1432                         else if (result < 0)
1433                                 printf("error invalid value\n");
1434                         else
1435                                 printf("unsupported\n");
1436                         fflush(stdout);
1437
1438                 } else if (!strcmp(buf.buf, "capabilities")) {
1439                         printf("stateless-connect\n");
1440                         printf("fetch\n");
1441                         printf("option\n");
1442                         printf("push\n");
1443                         printf("check-connectivity\n");
1444                         printf("\n");
1445                         fflush(stdout);
1446                 } else if (skip_prefix(buf.buf, "stateless-connect ", &arg)) {
1447                         if (!stateless_connect(arg))
1448                                 break;
1449                 } else {
1450                         error("remote-curl: unknown command '%s' from git", buf.buf);
1451                         return 1;
1452                 }
1453                 strbuf_reset(&buf);
1454         } while (1);
1455
1456         http_cleanup();
1457
1458         return 0;
1459 }