strvec: fix indentation in renamed calls
[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 "strvec.h"
14 #include "credential.h"
15 #include "oid-array.h"
16 #include "send-pack.h"
17 #include "protocol.h"
18 #include "quote.h"
19 #include "transport.h"
20
21 static struct remote *remote;
22 /* always ends with a trailing slash */
23 static struct strbuf url = STRBUF_INIT;
24
25 struct options {
26         int verbosity;
27         unsigned long depth;
28         char *deepen_since;
29         struct string_list deepen_not;
30         struct string_list push_options;
31         char *filter;
32         unsigned progress : 1,
33                 check_self_contained_and_connected : 1,
34                 cloning : 1,
35                 update_shallow : 1,
36                 followtags : 1,
37                 dry_run : 1,
38                 thin : 1,
39                 /* One of the SEND_PACK_PUSH_CERT_* constants. */
40                 push_cert : 2,
41                 deepen_relative : 1,
42                 from_promisor : 1,
43                 no_dependents : 1,
44                 atomic : 1,
45                 object_format : 1;
46         const struct git_hash_algo *hash_algo;
47 };
48 static struct options options;
49 static struct string_list cas_options = STRING_LIST_INIT_DUP;
50
51 static int set_option(const char *name, const char *value)
52 {
53         if (!strcmp(name, "verbosity")) {
54                 char *end;
55                 int v = strtol(value, &end, 10);
56                 if (value == end || *end)
57                         return -1;
58                 options.verbosity = v;
59                 return 0;
60         }
61         else if (!strcmp(name, "progress")) {
62                 if (!strcmp(value, "true"))
63                         options.progress = 1;
64                 else if (!strcmp(value, "false"))
65                         options.progress = 0;
66                 else
67                         return -1;
68                 return 0;
69         }
70         else if (!strcmp(name, "depth")) {
71                 char *end;
72                 unsigned long v = strtoul(value, &end, 10);
73                 if (value == end || *end)
74                         return -1;
75                 options.depth = v;
76                 return 0;
77         }
78         else if (!strcmp(name, "deepen-since")) {
79                 options.deepen_since = xstrdup(value);
80                 return 0;
81         }
82         else if (!strcmp(name, "deepen-not")) {
83                 string_list_append(&options.deepen_not, value);
84                 return 0;
85         }
86         else if (!strcmp(name, "deepen-relative")) {
87                 if (!strcmp(value, "true"))
88                         options.deepen_relative = 1;
89                 else if (!strcmp(value, "false"))
90                         options.deepen_relative = 0;
91                 else
92                         return -1;
93                 return 0;
94         }
95         else if (!strcmp(name, "followtags")) {
96                 if (!strcmp(value, "true"))
97                         options.followtags = 1;
98                 else if (!strcmp(value, "false"))
99                         options.followtags = 0;
100                 else
101                         return -1;
102                 return 0;
103         }
104         else if (!strcmp(name, "dry-run")) {
105                 if (!strcmp(value, "true"))
106                         options.dry_run = 1;
107                 else if (!strcmp(value, "false"))
108                         options.dry_run = 0;
109                 else
110                         return -1;
111                 return 0;
112         }
113         else if (!strcmp(name, "check-connectivity")) {
114                 if (!strcmp(value, "true"))
115                         options.check_self_contained_and_connected = 1;
116                 else if (!strcmp(value, "false"))
117                         options.check_self_contained_and_connected = 0;
118                 else
119                         return -1;
120                 return 0;
121         }
122         else if (!strcmp(name, "cas")) {
123                 struct strbuf val = STRBUF_INIT;
124                 strbuf_addf(&val, "--" CAS_OPT_NAME "=%s", value);
125                 string_list_append(&cas_options, val.buf);
126                 strbuf_release(&val);
127                 return 0;
128         } else if (!strcmp(name, "cloning")) {
129                 if (!strcmp(value, "true"))
130                         options.cloning = 1;
131                 else if (!strcmp(value, "false"))
132                         options.cloning = 0;
133                 else
134                         return -1;
135                 return 0;
136         } else if (!strcmp(name, "update-shallow")) {
137                 if (!strcmp(value, "true"))
138                         options.update_shallow = 1;
139                 else if (!strcmp(value, "false"))
140                         options.update_shallow = 0;
141                 else
142                         return -1;
143                 return 0;
144         } else if (!strcmp(name, "pushcert")) {
145                 if (!strcmp(value, "true"))
146                         options.push_cert = SEND_PACK_PUSH_CERT_ALWAYS;
147                 else if (!strcmp(value, "false"))
148                         options.push_cert = SEND_PACK_PUSH_CERT_NEVER;
149                 else if (!strcmp(value, "if-asked"))
150                         options.push_cert = SEND_PACK_PUSH_CERT_IF_ASKED;
151                 else
152                         return -1;
153                 return 0;
154         } else if (!strcmp(name, "atomic")) {
155                 if (!strcmp(value, "true"))
156                         options.atomic = 1;
157                 else if (!strcmp(value, "false"))
158                         options.atomic = 0;
159                 else
160                         return -1;
161                 return 0;
162         } else if (!strcmp(name, "push-option")) {
163                 if (*value != '"')
164                         string_list_append(&options.push_options, value);
165                 else {
166                         struct strbuf unquoted = STRBUF_INIT;
167                         if (unquote_c_style(&unquoted, value, NULL) < 0)
168                                 die(_("invalid quoting in push-option value: '%s'"), value);
169                         string_list_append_nodup(&options.push_options,
170                                                  strbuf_detach(&unquoted, NULL));
171                 }
172                 return 0;
173
174 #if LIBCURL_VERSION_NUM >= 0x070a08
175         } else if (!strcmp(name, "family")) {
176                 if (!strcmp(value, "ipv4"))
177                         git_curl_ipresolve = CURL_IPRESOLVE_V4;
178                 else if (!strcmp(value, "ipv6"))
179                         git_curl_ipresolve = CURL_IPRESOLVE_V6;
180                 else if (!strcmp(value, "all"))
181                         git_curl_ipresolve = CURL_IPRESOLVE_WHATEVER;
182                 else
183                         return -1;
184                 return 0;
185 #endif /* LIBCURL_VERSION_NUM >= 0x070a08 */
186         } else if (!strcmp(name, "from-promisor")) {
187                 options.from_promisor = 1;
188                 return 0;
189         } else if (!strcmp(name, "no-dependents")) {
190                 options.no_dependents = 1;
191                 return 0;
192         } else if (!strcmp(name, "filter")) {
193                 options.filter = xstrdup(value);
194                 return 0;
195         } else if (!strcmp(name, "object-format")) {
196                 int algo;
197                 options.object_format = 1;
198                 if (strcmp(value, "true")) {
199                         algo = hash_algo_by_name(value);
200                         if (algo == GIT_HASH_UNKNOWN)
201                                 die("unknown object format '%s'", value);
202                         options.hash_algo = &hash_algos[algo];
203                 }
204                 return 0;
205         } else {
206                 return 1 /* unsupported */;
207         }
208 }
209
210 struct discovery {
211         char *service;
212         char *buf_alloc;
213         char *buf;
214         size_t len;
215         struct ref *refs;
216         struct oid_array shallow;
217         enum protocol_version version;
218         unsigned proto_git : 1;
219 };
220 static struct discovery *last_discovery;
221
222 static struct ref *parse_git_refs(struct discovery *heads, int for_push)
223 {
224         struct ref *list = NULL;
225         struct packet_reader reader;
226
227         packet_reader_init(&reader, -1, heads->buf, heads->len,
228                            PACKET_READ_CHOMP_NEWLINE |
229                            PACKET_READ_GENTLE_ON_EOF |
230                            PACKET_READ_DIE_ON_ERR_PACKET);
231
232         heads->version = discover_version(&reader);
233         switch (heads->version) {
234         case protocol_v2:
235                 /*
236                  * Do nothing.  This isn't a list of refs but rather a
237                  * capability advertisement.  Client would have run
238                  * 'stateless-connect' so we'll dump this capability listing
239                  * and let them request the refs themselves.
240                  */
241                 break;
242         case protocol_v1:
243         case protocol_v0:
244                 get_remote_heads(&reader, &list, for_push ? REF_NORMAL : 0,
245                                  NULL, &heads->shallow);
246                 options.hash_algo = reader.hash_algo;
247                 break;
248         case protocol_unknown_version:
249                 BUG("unknown protocol version");
250         }
251
252         return list;
253 }
254
255 static const struct git_hash_algo *detect_hash_algo(struct discovery *heads)
256 {
257         const char *p = memchr(heads->buf, '\t', heads->len);
258         int algo;
259         if (!p)
260                 return the_hash_algo;
261
262         algo = hash_algo_by_length((p - heads->buf) / 2);
263         if (algo == GIT_HASH_UNKNOWN)
264                 return NULL;
265         return &hash_algos[algo];
266 }
267
268 static struct ref *parse_info_refs(struct discovery *heads)
269 {
270         char *data, *start, *mid;
271         char *ref_name;
272         int i = 0;
273
274         struct ref *refs = NULL;
275         struct ref *ref = NULL;
276         struct ref *last_ref = NULL;
277
278         options.hash_algo = detect_hash_algo(heads);
279         if (!options.hash_algo)
280                 die("%sinfo/refs not valid: could not determine hash algorithm; "
281                     "is this a git repository?",
282                     transport_anonymize_url(url.buf));
283
284         data = heads->buf;
285         start = NULL;
286         mid = data;
287         while (i < heads->len) {
288                 if (!start) {
289                         start = &data[i];
290                 }
291                 if (data[i] == '\t')
292                         mid = &data[i];
293                 if (data[i] == '\n') {
294                         if (mid - start != options.hash_algo->hexsz)
295                                 die(_("%sinfo/refs not valid: is this a git repository?"),
296                                     transport_anonymize_url(url.buf));
297                         data[i] = 0;
298                         ref_name = mid + 1;
299                         ref = alloc_ref(ref_name);
300                         get_oid_hex_algop(start, &ref->old_oid, options.hash_algo);
301                         if (!refs)
302                                 refs = ref;
303                         if (last_ref)
304                                 last_ref->next = ref;
305                         last_ref = ref;
306                         start = NULL;
307                 }
308                 i++;
309         }
310
311         ref = alloc_ref("HEAD");
312         if (!http_fetch_ref(url.buf, ref) &&
313             !resolve_remote_symref(ref, refs)) {
314                 ref->next = refs;
315                 refs = ref;
316         } else {
317                 free(ref);
318         }
319
320         return refs;
321 }
322
323 static void free_discovery(struct discovery *d)
324 {
325         if (d) {
326                 if (d == last_discovery)
327                         last_discovery = NULL;
328                 free(d->shallow.oid);
329                 free(d->buf_alloc);
330                 free_refs(d->refs);
331                 free(d->service);
332                 free(d);
333         }
334 }
335
336 static int show_http_message(struct strbuf *type, struct strbuf *charset,
337                              struct strbuf *msg)
338 {
339         const char *p, *eol;
340
341         /*
342          * We only show text/plain parts, as other types are likely
343          * to be ugly to look at on the user's terminal.
344          */
345         if (strcmp(type->buf, "text/plain"))
346                 return -1;
347         if (charset->len)
348                 strbuf_reencode(msg, charset->buf, get_log_output_encoding());
349
350         strbuf_trim(msg);
351         if (!msg->len)
352                 return -1;
353
354         p = msg->buf;
355         do {
356                 eol = strchrnul(p, '\n');
357                 fprintf(stderr, "remote: %.*s\n", (int)(eol - p), p);
358                 p = eol + 1;
359         } while(*eol);
360         return 0;
361 }
362
363 static int get_protocol_http_header(enum protocol_version version,
364                                     struct strbuf *header)
365 {
366         if (version > 0) {
367                 strbuf_addf(header, GIT_PROTOCOL_HEADER ": version=%d",
368                             version);
369
370                 return 1;
371         }
372
373         return 0;
374 }
375
376 static void check_smart_http(struct discovery *d, const char *service,
377                              struct strbuf *type)
378 {
379         const char *p;
380         struct packet_reader reader;
381
382         /*
383          * If we don't see x-$service-advertisement, then it's not smart-http.
384          * But once we do, we commit to it and assume any other protocol
385          * violations are hard errors.
386          */
387         if (!skip_prefix(type->buf, "application/x-", &p) ||
388             !skip_prefix(p, service, &p) ||
389             strcmp(p, "-advertisement"))
390                 return;
391
392         packet_reader_init(&reader, -1, d->buf, d->len,
393                            PACKET_READ_CHOMP_NEWLINE |
394                            PACKET_READ_DIE_ON_ERR_PACKET);
395         if (packet_reader_read(&reader) != PACKET_READ_NORMAL)
396                 die(_("invalid server response; expected service, got flush packet"));
397
398         if (skip_prefix(reader.line, "# service=", &p) && !strcmp(p, service)) {
399                 /*
400                  * The header can include additional metadata lines, up
401                  * until a packet flush marker.  Ignore these now, but
402                  * in the future we might start to scan them.
403                  */
404                 for (;;) {
405                         packet_reader_read(&reader);
406                         if (reader.pktlen <= 0) {
407                                 break;
408                         }
409                 }
410
411                 /*
412                  * v0 smart http; callers expect us to soak up the
413                  * service and header packets
414                  */
415                 d->buf = reader.src_buffer;
416                 d->len = reader.src_len;
417                 d->proto_git = 1;
418
419         } else if (!strcmp(reader.line, "version 2")) {
420                 /*
421                  * v2 smart http; do not consume version packet, which will
422                  * be handled elsewhere.
423                  */
424                 d->proto_git = 1;
425
426         } else {
427                 die(_("invalid server response; got '%s'"), reader.line);
428         }
429 }
430
431 static struct discovery *discover_refs(const char *service, int for_push)
432 {
433         struct strbuf type = STRBUF_INIT;
434         struct strbuf charset = STRBUF_INIT;
435         struct strbuf buffer = STRBUF_INIT;
436         struct strbuf refs_url = STRBUF_INIT;
437         struct strbuf effective_url = STRBUF_INIT;
438         struct strbuf protocol_header = STRBUF_INIT;
439         struct string_list extra_headers = STRING_LIST_INIT_DUP;
440         struct discovery *last = last_discovery;
441         int http_ret, maybe_smart = 0;
442         struct http_get_options http_options;
443         enum protocol_version version = get_protocol_version_config();
444
445         if (last && !strcmp(service, last->service))
446                 return last;
447         free_discovery(last);
448
449         strbuf_addf(&refs_url, "%sinfo/refs", url.buf);
450         if ((starts_with(url.buf, "http://") || starts_with(url.buf, "https://")) &&
451              git_env_bool("GIT_SMART_HTTP", 1)) {
452                 maybe_smart = 1;
453                 if (!strchr(url.buf, '?'))
454                         strbuf_addch(&refs_url, '?');
455                 else
456                         strbuf_addch(&refs_url, '&');
457                 strbuf_addf(&refs_url, "service=%s", service);
458         }
459
460         /*
461          * NEEDSWORK: If we are trying to use protocol v2 and we are planning
462          * to perform a push, then fallback to v0 since the client doesn't know
463          * how to push yet using v2.
464          */
465         if (version == protocol_v2 && !strcmp("git-receive-pack", service))
466                 version = protocol_v0;
467
468         /* Add the extra Git-Protocol header */
469         if (get_protocol_http_header(version, &protocol_header))
470                 string_list_append(&extra_headers, protocol_header.buf);
471
472         memset(&http_options, 0, sizeof(http_options));
473         http_options.content_type = &type;
474         http_options.charset = &charset;
475         http_options.effective_url = &effective_url;
476         http_options.base_url = &url;
477         http_options.extra_headers = &extra_headers;
478         http_options.initial_request = 1;
479         http_options.no_cache = 1;
480
481         http_ret = http_get_strbuf(refs_url.buf, &buffer, &http_options);
482         switch (http_ret) {
483         case HTTP_OK:
484                 break;
485         case HTTP_MISSING_TARGET:
486                 show_http_message(&type, &charset, &buffer);
487                 die(_("repository '%s' not found"),
488                     transport_anonymize_url(url.buf));
489         case HTTP_NOAUTH:
490                 show_http_message(&type, &charset, &buffer);
491                 die(_("Authentication failed for '%s'"),
492                     transport_anonymize_url(url.buf));
493         default:
494                 show_http_message(&type, &charset, &buffer);
495                 die(_("unable to access '%s': %s"),
496                     transport_anonymize_url(url.buf), curl_errorstr);
497         }
498
499         if (options.verbosity && !starts_with(refs_url.buf, url.buf)) {
500                 char *u = transport_anonymize_url(url.buf);
501                 warning(_("redirecting to %s"), u);
502                 free(u);
503         }
504
505         last= xcalloc(1, sizeof(*last_discovery));
506         last->service = xstrdup(service);
507         last->buf_alloc = strbuf_detach(&buffer, &last->len);
508         last->buf = last->buf_alloc;
509
510         if (maybe_smart)
511                 check_smart_http(last, service, &type);
512
513         if (last->proto_git)
514                 last->refs = parse_git_refs(last, for_push);
515         else
516                 last->refs = parse_info_refs(last);
517
518         strbuf_release(&refs_url);
519         strbuf_release(&type);
520         strbuf_release(&charset);
521         strbuf_release(&effective_url);
522         strbuf_release(&buffer);
523         strbuf_release(&protocol_header);
524         string_list_clear(&extra_headers, 0);
525         last_discovery = last;
526         return last;
527 }
528
529 static struct ref *get_refs(int for_push)
530 {
531         struct discovery *heads;
532
533         if (for_push)
534                 heads = discover_refs("git-receive-pack", for_push);
535         else
536                 heads = discover_refs("git-upload-pack", for_push);
537
538         return heads->refs;
539 }
540
541 static void output_refs(struct ref *refs)
542 {
543         struct ref *posn;
544         if (options.object_format && options.hash_algo) {
545                 printf(":object-format %s\n", options.hash_algo->name);
546         }
547         for (posn = refs; posn; posn = posn->next) {
548                 if (posn->symref)
549                         printf("@%s %s\n", posn->symref, posn->name);
550                 else
551                         printf("%s %s\n", hash_to_hex_algop(posn->old_oid.hash,
552                                                             options.hash_algo),
553                                           posn->name);
554         }
555         printf("\n");
556         fflush(stdout);
557 }
558
559 struct rpc_state {
560         const char *service_name;
561         char *service_url;
562         char *hdr_content_type;
563         char *hdr_accept;
564         char *protocol_header;
565         char *buf;
566         size_t alloc;
567         size_t len;
568         size_t pos;
569         int in;
570         int out;
571         int any_written;
572         unsigned gzip_request : 1;
573         unsigned initial_buffer : 1;
574
575         /*
576          * Whenever a pkt-line is read into buf, append the 4 characters
577          * denoting its length before appending the payload.
578          */
579         unsigned write_line_lengths : 1;
580
581         /*
582          * Used by rpc_out; initialize to 0. This is true if a flush has been
583          * read, but the corresponding line length (if write_line_lengths is
584          * true) and EOF have not been sent to libcurl. Since each flush marks
585          * the end of a request, each flush must be completely sent before any
586          * further reading occurs.
587          */
588         unsigned flush_read_but_not_sent : 1;
589 };
590
591 /*
592  * Appends the result of reading from rpc->out to the string represented by
593  * rpc->buf and rpc->len if there is enough space. Returns 1 if there was
594  * enough space, 0 otherwise.
595  *
596  * If rpc->write_line_lengths is true, appends the line length as a 4-byte
597  * hexadecimal string before appending the result described above.
598  *
599  * Writes the total number of bytes appended into appended.
600  */
601 static int rpc_read_from_out(struct rpc_state *rpc, int options,
602                              size_t *appended,
603                              enum packet_read_status *status) {
604         size_t left;
605         char *buf;
606         int pktlen_raw;
607
608         if (rpc->write_line_lengths) {
609                 left = rpc->alloc - rpc->len - 4;
610                 buf = rpc->buf + rpc->len + 4;
611         } else {
612                 left = rpc->alloc - rpc->len;
613                 buf = rpc->buf + rpc->len;
614         }
615
616         if (left < LARGE_PACKET_MAX)
617                 return 0;
618
619         *status = packet_read_with_status(rpc->out, NULL, NULL, buf,
620                         left, &pktlen_raw, options);
621         if (*status != PACKET_READ_EOF) {
622                 *appended = pktlen_raw + (rpc->write_line_lengths ? 4 : 0);
623                 rpc->len += *appended;
624         }
625
626         if (rpc->write_line_lengths) {
627                 switch (*status) {
628                 case PACKET_READ_EOF:
629                         if (!(options & PACKET_READ_GENTLE_ON_EOF))
630                                 die(_("shouldn't have EOF when not gentle on EOF"));
631                         break;
632                 case PACKET_READ_NORMAL:
633                         set_packet_header(buf - 4, *appended);
634                         break;
635                 case PACKET_READ_DELIM:
636                         memcpy(buf - 4, "0001", 4);
637                         break;
638                 case PACKET_READ_FLUSH:
639                         memcpy(buf - 4, "0000", 4);
640                         break;
641                 case PACKET_READ_RESPONSE_END:
642                         die(_("remote server sent stateless separator"));
643                 }
644         }
645
646         return 1;
647 }
648
649 static size_t rpc_out(void *ptr, size_t eltsize,
650                 size_t nmemb, void *buffer_)
651 {
652         size_t max = eltsize * nmemb;
653         struct rpc_state *rpc = buffer_;
654         size_t avail = rpc->len - rpc->pos;
655         enum packet_read_status status;
656
657         if (!avail) {
658                 rpc->initial_buffer = 0;
659                 rpc->len = 0;
660                 rpc->pos = 0;
661                 if (!rpc->flush_read_but_not_sent) {
662                         if (!rpc_read_from_out(rpc, 0, &avail, &status))
663                                 BUG("The entire rpc->buf should be larger than LARGE_PACKET_MAX");
664                         if (status == PACKET_READ_FLUSH)
665                                 rpc->flush_read_but_not_sent = 1;
666                 }
667                 /*
668                  * If flush_read_but_not_sent is true, we have already read one
669                  * full request but have not fully sent it + EOF, which is why
670                  * we need to refrain from reading.
671                  */
672         }
673         if (rpc->flush_read_but_not_sent) {
674                 if (!avail) {
675                         /*
676                          * The line length either does not need to be sent at
677                          * all or has already been completely sent. Now we can
678                          * return 0, indicating EOF, meaning that the flush has
679                          * been fully sent.
680                          */
681                         rpc->flush_read_but_not_sent = 0;
682                         return 0;
683                 }
684                 /*
685                  * If avail is non-zero, the line length for the flush still
686                  * hasn't been fully sent. Proceed with sending the line
687                  * length.
688                  */
689         }
690
691         if (max < avail)
692                 avail = max;
693         memcpy(ptr, rpc->buf + rpc->pos, avail);
694         rpc->pos += avail;
695         return avail;
696 }
697
698 #ifndef NO_CURL_IOCTL
699 static curlioerr rpc_ioctl(CURL *handle, int cmd, void *clientp)
700 {
701         struct rpc_state *rpc = clientp;
702
703         switch (cmd) {
704         case CURLIOCMD_NOP:
705                 return CURLIOE_OK;
706
707         case CURLIOCMD_RESTARTREAD:
708                 if (rpc->initial_buffer) {
709                         rpc->pos = 0;
710                         return CURLIOE_OK;
711                 }
712                 error(_("unable to rewind rpc post data - try increasing http.postBuffer"));
713                 return CURLIOE_FAILRESTART;
714
715         default:
716                 return CURLIOE_UNKNOWNCMD;
717         }
718 }
719 #endif
720
721 struct check_pktline_state {
722         char len_buf[4];
723         int len_filled;
724         int remaining;
725 };
726
727 static void check_pktline(struct check_pktline_state *state, const char *ptr, size_t size)
728 {
729         while (size) {
730                 if (!state->remaining) {
731                         int digits_remaining = 4 - state->len_filled;
732                         if (digits_remaining > size)
733                                 digits_remaining = size;
734                         memcpy(&state->len_buf[state->len_filled], ptr, digits_remaining);
735                         state->len_filled += digits_remaining;
736                         ptr += digits_remaining;
737                         size -= digits_remaining;
738
739                         if (state->len_filled == 4) {
740                                 state->remaining = packet_length(state->len_buf);
741                                 if (state->remaining < 0) {
742                                         die(_("remote-curl: bad line length character: %.4s"), state->len_buf);
743                                 } else if (state->remaining == 2) {
744                                         die(_("remote-curl: unexpected response end packet"));
745                                 } else if (state->remaining < 4) {
746                                         state->remaining = 0;
747                                 } else {
748                                         state->remaining -= 4;
749                                 }
750                                 state->len_filled = 0;
751                         }
752                 }
753
754                 if (state->remaining) {
755                         int remaining = state->remaining;
756                         if (remaining > size)
757                                 remaining = size;
758                         ptr += remaining;
759                         size -= remaining;
760                         state->remaining -= remaining;
761                 }
762         }
763 }
764
765 struct rpc_in_data {
766         struct rpc_state *rpc;
767         struct active_request_slot *slot;
768         int check_pktline;
769         struct check_pktline_state pktline_state;
770 };
771
772 /*
773  * A callback for CURLOPT_WRITEFUNCTION. The return value is the bytes consumed
774  * from ptr.
775  */
776 static size_t rpc_in(char *ptr, size_t eltsize,
777                 size_t nmemb, void *buffer_)
778 {
779         size_t size = eltsize * nmemb;
780         struct rpc_in_data *data = buffer_;
781         long response_code;
782
783         if (curl_easy_getinfo(data->slot->curl, CURLINFO_RESPONSE_CODE,
784                               &response_code) != CURLE_OK)
785                 return size;
786         if (response_code >= 300)
787                 return size;
788         if (size)
789                 data->rpc->any_written = 1;
790         if (data->check_pktline)
791                 check_pktline(&data->pktline_state, ptr, size);
792         write_or_die(data->rpc->in, ptr, size);
793         return size;
794 }
795
796 static int run_slot(struct active_request_slot *slot,
797                     struct slot_results *results)
798 {
799         int err;
800         struct slot_results results_buf;
801
802         if (!results)
803                 results = &results_buf;
804
805         err = run_one_slot(slot, results);
806
807         if (err != HTTP_OK && err != HTTP_REAUTH) {
808                 struct strbuf msg = STRBUF_INIT;
809                 if (results->http_code && results->http_code != 200)
810                         strbuf_addf(&msg, "HTTP %ld", results->http_code);
811                 if (results->curl_result != CURLE_OK) {
812                         if (msg.len)
813                                 strbuf_addch(&msg, ' ');
814                         strbuf_addf(&msg, "curl %d", results->curl_result);
815                         if (curl_errorstr[0]) {
816                                 strbuf_addch(&msg, ' ');
817                                 strbuf_addstr(&msg, curl_errorstr);
818                         }
819                 }
820                 error(_("RPC failed; %s"), msg.buf);
821                 strbuf_release(&msg);
822         }
823
824         return err;
825 }
826
827 static int probe_rpc(struct rpc_state *rpc, struct slot_results *results)
828 {
829         struct active_request_slot *slot;
830         struct curl_slist *headers = http_copy_default_headers();
831         struct strbuf buf = STRBUF_INIT;
832         int err;
833
834         slot = get_active_slot();
835
836         headers = curl_slist_append(headers, rpc->hdr_content_type);
837         headers = curl_slist_append(headers, rpc->hdr_accept);
838
839         curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
840         curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
841         curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
842         curl_easy_setopt(slot->curl, CURLOPT_ENCODING, NULL);
843         curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, "0000");
844         curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, 4);
845         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
846         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
847         curl_easy_setopt(slot->curl, CURLOPT_FILE, &buf);
848
849         err = run_slot(slot, results);
850
851         curl_slist_free_all(headers);
852         strbuf_release(&buf);
853         return err;
854 }
855
856 static curl_off_t xcurl_off_t(size_t len)
857 {
858         uintmax_t size = len;
859         if (size > maximum_signed_value_of_type(curl_off_t))
860                 die(_("cannot handle pushes this big"));
861         return (curl_off_t)size;
862 }
863
864 /*
865  * If flush_received is true, do not attempt to read any more; just use what's
866  * in rpc->buf.
867  */
868 static int post_rpc(struct rpc_state *rpc, int stateless_connect, int flush_received)
869 {
870         struct active_request_slot *slot;
871         struct curl_slist *headers = http_copy_default_headers();
872         int use_gzip = rpc->gzip_request;
873         char *gzip_body = NULL;
874         size_t gzip_size = 0;
875         int err, large_request = 0;
876         int needs_100_continue = 0;
877         struct rpc_in_data rpc_in_data;
878
879         /* Try to load the entire request, if we can fit it into the
880          * allocated buffer space we can use HTTP/1.0 and avoid the
881          * chunked encoding mess.
882          */
883         if (!flush_received) {
884                 while (1) {
885                         size_t n;
886                         enum packet_read_status status;
887
888                         if (!rpc_read_from_out(rpc, 0, &n, &status)) {
889                                 large_request = 1;
890                                 use_gzip = 0;
891                                 break;
892                         }
893                         if (status == PACKET_READ_FLUSH)
894                                 break;
895                 }
896         }
897
898         if (large_request) {
899                 struct slot_results results;
900
901                 do {
902                         err = probe_rpc(rpc, &results);
903                         if (err == HTTP_REAUTH)
904                                 credential_fill(&http_auth);
905                 } while (err == HTTP_REAUTH);
906                 if (err != HTTP_OK)
907                         return -1;
908
909                 if (results.auth_avail & CURLAUTH_GSSNEGOTIATE)
910                         needs_100_continue = 1;
911         }
912
913         headers = curl_slist_append(headers, rpc->hdr_content_type);
914         headers = curl_slist_append(headers, rpc->hdr_accept);
915         headers = curl_slist_append(headers, needs_100_continue ?
916                 "Expect: 100-continue" : "Expect:");
917
918         /* Add the extra Git-Protocol header */
919         if (rpc->protocol_header)
920                 headers = curl_slist_append(headers, rpc->protocol_header);
921
922 retry:
923         slot = get_active_slot();
924
925         curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
926         curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
927         curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
928         curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "");
929
930         if (large_request) {
931                 /* The request body is large and the size cannot be predicted.
932                  * We must use chunked encoding to send it.
933                  */
934                 headers = curl_slist_append(headers, "Transfer-Encoding: chunked");
935                 rpc->initial_buffer = 1;
936                 curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, rpc_out);
937                 curl_easy_setopt(slot->curl, CURLOPT_INFILE, rpc);
938 #ifndef NO_CURL_IOCTL
939                 curl_easy_setopt(slot->curl, CURLOPT_IOCTLFUNCTION, rpc_ioctl);
940                 curl_easy_setopt(slot->curl, CURLOPT_IOCTLDATA, rpc);
941 #endif
942                 if (options.verbosity > 1) {
943                         fprintf(stderr, "POST %s (chunked)\n", rpc->service_name);
944                         fflush(stderr);
945                 }
946
947         } else if (gzip_body) {
948                 /*
949                  * If we are looping to retry authentication, then the previous
950                  * run will have set up the headers and gzip buffer already,
951                  * and we just need to send it.
952                  */
953                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);
954                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE_LARGE, xcurl_off_t(gzip_size));
955
956         } else if (use_gzip && 1024 < rpc->len) {
957                 /* The client backend isn't giving us compressed data so
958                  * we can try to deflate it ourselves, this may save on
959                  * the transfer time.
960                  */
961                 git_zstream stream;
962                 int ret;
963
964                 git_deflate_init_gzip(&stream, Z_BEST_COMPRESSION);
965                 gzip_size = git_deflate_bound(&stream, rpc->len);
966                 gzip_body = xmalloc(gzip_size);
967
968                 stream.next_in = (unsigned char *)rpc->buf;
969                 stream.avail_in = rpc->len;
970                 stream.next_out = (unsigned char *)gzip_body;
971                 stream.avail_out = gzip_size;
972
973                 ret = git_deflate(&stream, Z_FINISH);
974                 if (ret != Z_STREAM_END)
975                         die(_("cannot deflate request; zlib deflate error %d"), ret);
976
977                 ret = git_deflate_end_gently(&stream);
978                 if (ret != Z_OK)
979                         die(_("cannot deflate request; zlib end error %d"), ret);
980
981                 gzip_size = stream.total_out;
982
983                 headers = curl_slist_append(headers, "Content-Encoding: gzip");
984                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);
985                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE_LARGE, xcurl_off_t(gzip_size));
986
987                 if (options.verbosity > 1) {
988                         fprintf(stderr, "POST %s (gzip %lu to %lu bytes)\n",
989                                 rpc->service_name,
990                                 (unsigned long)rpc->len, (unsigned long)gzip_size);
991                         fflush(stderr);
992                 }
993         } else {
994                 /* We know the complete request size in advance, use the
995                  * more normal Content-Length approach.
996                  */
997                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, rpc->buf);
998                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE_LARGE, xcurl_off_t(rpc->len));
999                 if (options.verbosity > 1) {
1000                         fprintf(stderr, "POST %s (%lu bytes)\n",
1001                                 rpc->service_name, (unsigned long)rpc->len);
1002                         fflush(stderr);
1003                 }
1004         }
1005
1006         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
1007         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, rpc_in);
1008         rpc_in_data.rpc = rpc;
1009         rpc_in_data.slot = slot;
1010         rpc_in_data.check_pktline = stateless_connect;
1011         memset(&rpc_in_data.pktline_state, 0, sizeof(rpc_in_data.pktline_state));
1012         curl_easy_setopt(slot->curl, CURLOPT_FILE, &rpc_in_data);
1013         curl_easy_setopt(slot->curl, CURLOPT_FAILONERROR, 0);
1014
1015
1016         rpc->any_written = 0;
1017         err = run_slot(slot, NULL);
1018         if (err == HTTP_REAUTH && !large_request) {
1019                 credential_fill(&http_auth);
1020                 goto retry;
1021         }
1022         if (err != HTTP_OK)
1023                 err = -1;
1024
1025         if (!rpc->any_written)
1026                 err = -1;
1027
1028         if (rpc_in_data.pktline_state.len_filled)
1029                 err = error(_("%d bytes of length header were received"), rpc_in_data.pktline_state.len_filled);
1030         if (rpc_in_data.pktline_state.remaining)
1031                 err = error(_("%d bytes of body are still expected"), rpc_in_data.pktline_state.remaining);
1032
1033         if (stateless_connect)
1034                 packet_response_end(rpc->in);
1035
1036         curl_slist_free_all(headers);
1037         free(gzip_body);
1038         return err;
1039 }
1040
1041 static int rpc_service(struct rpc_state *rpc, struct discovery *heads,
1042                        const char **client_argv, const struct strbuf *preamble,
1043                        struct strbuf *rpc_result)
1044 {
1045         const char *svc = rpc->service_name;
1046         struct strbuf buf = STRBUF_INIT;
1047         struct child_process client = CHILD_PROCESS_INIT;
1048         int err = 0;
1049
1050         client.in = -1;
1051         client.out = -1;
1052         client.git_cmd = 1;
1053         client.argv = client_argv;
1054         if (start_command(&client))
1055                 exit(1);
1056         write_or_die(client.in, preamble->buf, preamble->len);
1057         if (heads)
1058                 write_or_die(client.in, heads->buf, heads->len);
1059
1060         rpc->alloc = http_post_buffer;
1061         rpc->buf = xmalloc(rpc->alloc);
1062         rpc->in = client.in;
1063         rpc->out = client.out;
1064
1065         strbuf_addf(&buf, "%s%s", url.buf, svc);
1066         rpc->service_url = strbuf_detach(&buf, NULL);
1067
1068         strbuf_addf(&buf, "Content-Type: application/x-%s-request", svc);
1069         rpc->hdr_content_type = strbuf_detach(&buf, NULL);
1070
1071         strbuf_addf(&buf, "Accept: application/x-%s-result", svc);
1072         rpc->hdr_accept = strbuf_detach(&buf, NULL);
1073
1074         if (get_protocol_http_header(heads->version, &buf))
1075                 rpc->protocol_header = strbuf_detach(&buf, NULL);
1076         else
1077                 rpc->protocol_header = NULL;
1078
1079         while (!err) {
1080                 int n = packet_read(rpc->out, NULL, NULL, rpc->buf, rpc->alloc, 0);
1081                 if (!n)
1082                         break;
1083                 rpc->pos = 0;
1084                 rpc->len = n;
1085                 err |= post_rpc(rpc, 0, 0);
1086         }
1087
1088         close(client.in);
1089         client.in = -1;
1090         if (!err) {
1091                 strbuf_read(rpc_result, client.out, 0);
1092         } else {
1093                 char buf[4096];
1094                 for (;;)
1095                         if (xread(client.out, buf, sizeof(buf)) <= 0)
1096                                 break;
1097         }
1098
1099         close(client.out);
1100         client.out = -1;
1101
1102         err |= finish_command(&client);
1103         free(rpc->service_url);
1104         free(rpc->hdr_content_type);
1105         free(rpc->hdr_accept);
1106         free(rpc->protocol_header);
1107         free(rpc->buf);
1108         strbuf_release(&buf);
1109         return err;
1110 }
1111
1112 static int fetch_dumb(int nr_heads, struct ref **to_fetch)
1113 {
1114         struct walker *walker;
1115         char **targets;
1116         int ret, i;
1117
1118         ALLOC_ARRAY(targets, nr_heads);
1119         if (options.depth || options.deepen_since)
1120                 die(_("dumb http transport does not support shallow capabilities"));
1121         for (i = 0; i < nr_heads; i++)
1122                 targets[i] = xstrdup(oid_to_hex(&to_fetch[i]->old_oid));
1123
1124         walker = get_http_walker(url.buf);
1125         walker->get_verbosely = options.verbosity >= 3;
1126         walker->get_progress = options.progress;
1127         walker->get_recover = 0;
1128         ret = walker_fetch(walker, nr_heads, targets, NULL, NULL);
1129         walker_free(walker);
1130
1131         for (i = 0; i < nr_heads; i++)
1132                 free(targets[i]);
1133         free(targets);
1134
1135         return ret ? error(_("fetch failed.")) : 0;
1136 }
1137
1138 static int fetch_git(struct discovery *heads,
1139         int nr_heads, struct ref **to_fetch)
1140 {
1141         struct rpc_state rpc;
1142         struct strbuf preamble = STRBUF_INIT;
1143         int i, err;
1144         struct strvec args = STRVEC_INIT;
1145         struct strbuf rpc_result = STRBUF_INIT;
1146
1147         strvec_pushl(&args, "fetch-pack", "--stateless-rpc",
1148                      "--stdin", "--lock-pack", NULL);
1149         if (options.followtags)
1150                 strvec_push(&args, "--include-tag");
1151         if (options.thin)
1152                 strvec_push(&args, "--thin");
1153         if (options.verbosity >= 3)
1154                 strvec_pushl(&args, "-v", "-v", NULL);
1155         if (options.check_self_contained_and_connected)
1156                 strvec_push(&args, "--check-self-contained-and-connected");
1157         if (options.cloning)
1158                 strvec_push(&args, "--cloning");
1159         if (options.update_shallow)
1160                 strvec_push(&args, "--update-shallow");
1161         if (!options.progress)
1162                 strvec_push(&args, "--no-progress");
1163         if (options.depth)
1164                 strvec_pushf(&args, "--depth=%lu", options.depth);
1165         if (options.deepen_since)
1166                 strvec_pushf(&args, "--shallow-since=%s", options.deepen_since);
1167         for (i = 0; i < options.deepen_not.nr; i++)
1168                 strvec_pushf(&args, "--shallow-exclude=%s",
1169                              options.deepen_not.items[i].string);
1170         if (options.deepen_relative && options.depth)
1171                 strvec_push(&args, "--deepen-relative");
1172         if (options.from_promisor)
1173                 strvec_push(&args, "--from-promisor");
1174         if (options.no_dependents)
1175                 strvec_push(&args, "--no-dependents");
1176         if (options.filter)
1177                 strvec_pushf(&args, "--filter=%s", options.filter);
1178         strvec_push(&args, url.buf);
1179
1180         for (i = 0; i < nr_heads; i++) {
1181                 struct ref *ref = to_fetch[i];
1182                 if (!*ref->name)
1183                         die(_("cannot fetch by sha1 over smart http"));
1184                 packet_buf_write(&preamble, "%s %s\n",
1185                                  oid_to_hex(&ref->old_oid), ref->name);
1186         }
1187         packet_buf_flush(&preamble);
1188
1189         memset(&rpc, 0, sizeof(rpc));
1190         rpc.service_name = "git-upload-pack",
1191         rpc.gzip_request = 1;
1192
1193         err = rpc_service(&rpc, heads, args.argv, &preamble, &rpc_result);
1194         if (rpc_result.len)
1195                 write_or_die(1, rpc_result.buf, rpc_result.len);
1196         strbuf_release(&rpc_result);
1197         strbuf_release(&preamble);
1198         strvec_clear(&args);
1199         return err;
1200 }
1201
1202 static int fetch(int nr_heads, struct ref **to_fetch)
1203 {
1204         struct discovery *d = discover_refs("git-upload-pack", 0);
1205         if (d->proto_git)
1206                 return fetch_git(d, nr_heads, to_fetch);
1207         else
1208                 return fetch_dumb(nr_heads, to_fetch);
1209 }
1210
1211 static void parse_fetch(struct strbuf *buf)
1212 {
1213         struct ref **to_fetch = NULL;
1214         struct ref *list_head = NULL;
1215         struct ref **list = &list_head;
1216         int alloc_heads = 0, nr_heads = 0;
1217
1218         do {
1219                 const char *p;
1220                 if (skip_prefix(buf->buf, "fetch ", &p)) {
1221                         const char *name;
1222                         struct ref *ref;
1223                         struct object_id old_oid;
1224                         const char *q;
1225
1226                         if (parse_oid_hex(p, &old_oid, &q))
1227                                 die(_("protocol error: expected sha/ref, got '%s'"), p);
1228                         if (*q == ' ')
1229                                 name = q + 1;
1230                         else if (!*q)
1231                                 name = "";
1232                         else
1233                                 die(_("protocol error: expected sha/ref, got '%s'"), p);
1234
1235                         ref = alloc_ref(name);
1236                         oidcpy(&ref->old_oid, &old_oid);
1237
1238                         *list = ref;
1239                         list = &ref->next;
1240
1241                         ALLOC_GROW(to_fetch, nr_heads + 1, alloc_heads);
1242                         to_fetch[nr_heads++] = ref;
1243                 }
1244                 else
1245                         die(_("http transport does not support %s"), buf->buf);
1246
1247                 strbuf_reset(buf);
1248                 if (strbuf_getline_lf(buf, stdin) == EOF)
1249                         return;
1250                 if (!*buf->buf)
1251                         break;
1252         } while (1);
1253
1254         if (fetch(nr_heads, to_fetch))
1255                 exit(128); /* error already reported */
1256         free_refs(list_head);
1257         free(to_fetch);
1258
1259         printf("\n");
1260         fflush(stdout);
1261         strbuf_reset(buf);
1262 }
1263
1264 static int push_dav(int nr_spec, const char **specs)
1265 {
1266         struct child_process child = CHILD_PROCESS_INIT;
1267         size_t i;
1268
1269         child.git_cmd = 1;
1270         strvec_push(&child.args, "http-push");
1271         strvec_push(&child.args, "--helper-status");
1272         if (options.dry_run)
1273                 strvec_push(&child.args, "--dry-run");
1274         if (options.verbosity > 1)
1275                 strvec_push(&child.args, "--verbose");
1276         strvec_push(&child.args, url.buf);
1277         for (i = 0; i < nr_spec; i++)
1278                 strvec_push(&child.args, specs[i]);
1279
1280         if (run_command(&child))
1281                 die(_("git-http-push failed"));
1282         return 0;
1283 }
1284
1285 static int push_git(struct discovery *heads, int nr_spec, const char **specs)
1286 {
1287         struct rpc_state rpc;
1288         int i, err;
1289         struct strvec args;
1290         struct string_list_item *cas_option;
1291         struct strbuf preamble = STRBUF_INIT;
1292         struct strbuf rpc_result = STRBUF_INIT;
1293
1294         strvec_init(&args);
1295         strvec_pushl(&args, "send-pack", "--stateless-rpc", "--helper-status",
1296                      NULL);
1297
1298         if (options.thin)
1299                 strvec_push(&args, "--thin");
1300         if (options.dry_run)
1301                 strvec_push(&args, "--dry-run");
1302         if (options.push_cert == SEND_PACK_PUSH_CERT_ALWAYS)
1303                 strvec_push(&args, "--signed=yes");
1304         else if (options.push_cert == SEND_PACK_PUSH_CERT_IF_ASKED)
1305                 strvec_push(&args, "--signed=if-asked");
1306         if (options.atomic)
1307                 strvec_push(&args, "--atomic");
1308         if (options.verbosity == 0)
1309                 strvec_push(&args, "--quiet");
1310         else if (options.verbosity > 1)
1311                 strvec_push(&args, "--verbose");
1312         for (i = 0; i < options.push_options.nr; i++)
1313                 strvec_pushf(&args, "--push-option=%s",
1314                              options.push_options.items[i].string);
1315         strvec_push(&args, options.progress ? "--progress" : "--no-progress");
1316         for_each_string_list_item(cas_option, &cas_options)
1317                 strvec_push(&args, cas_option->string);
1318         strvec_push(&args, url.buf);
1319
1320         strvec_push(&args, "--stdin");
1321         for (i = 0; i < nr_spec; i++)
1322                 packet_buf_write(&preamble, "%s\n", specs[i]);
1323         packet_buf_flush(&preamble);
1324
1325         memset(&rpc, 0, sizeof(rpc));
1326         rpc.service_name = "git-receive-pack",
1327
1328         err = rpc_service(&rpc, heads, args.argv, &preamble, &rpc_result);
1329         if (rpc_result.len)
1330                 write_or_die(1, rpc_result.buf, rpc_result.len);
1331         strbuf_release(&rpc_result);
1332         strbuf_release(&preamble);
1333         strvec_clear(&args);
1334         return err;
1335 }
1336
1337 static int push(int nr_spec, const char **specs)
1338 {
1339         struct discovery *heads = discover_refs("git-receive-pack", 1);
1340         int ret;
1341
1342         if (heads->proto_git)
1343                 ret = push_git(heads, nr_spec, specs);
1344         else
1345                 ret = push_dav(nr_spec, specs);
1346         free_discovery(heads);
1347         return ret;
1348 }
1349
1350 static void parse_push(struct strbuf *buf)
1351 {
1352         struct strvec specs = STRVEC_INIT;
1353         int ret;
1354
1355         do {
1356                 const char *arg;
1357                 if (skip_prefix(buf->buf, "push ", &arg))
1358                         strvec_push(&specs, arg);
1359                 else
1360                         die(_("http transport does not support %s"), buf->buf);
1361
1362                 strbuf_reset(buf);
1363                 if (strbuf_getline_lf(buf, stdin) == EOF)
1364                         goto free_specs;
1365                 if (!*buf->buf)
1366                         break;
1367         } while (1);
1368
1369         ret = push(specs.argc, specs.argv);
1370         printf("\n");
1371         fflush(stdout);
1372
1373         if (ret)
1374                 exit(128); /* error already reported */
1375
1376 free_specs:
1377         strvec_clear(&specs);
1378 }
1379
1380 static int stateless_connect(const char *service_name)
1381 {
1382         struct discovery *discover;
1383         struct rpc_state rpc;
1384         struct strbuf buf = STRBUF_INIT;
1385
1386         /*
1387          * Run the info/refs request and see if the server supports protocol
1388          * v2.  If and only if the server supports v2 can we successfully
1389          * establish a stateless connection, otherwise we need to tell the
1390          * client to fallback to using other transport helper functions to
1391          * complete their request.
1392          */
1393         discover = discover_refs(service_name, 0);
1394         if (discover->version != protocol_v2) {
1395                 printf("fallback\n");
1396                 fflush(stdout);
1397                 return -1;
1398         } else {
1399                 /* Stateless Connection established */
1400                 printf("\n");
1401                 fflush(stdout);
1402         }
1403
1404         rpc.service_name = service_name;
1405         rpc.service_url = xstrfmt("%s%s", url.buf, rpc.service_name);
1406         rpc.hdr_content_type = xstrfmt("Content-Type: application/x-%s-request", rpc.service_name);
1407         rpc.hdr_accept = xstrfmt("Accept: application/x-%s-result", rpc.service_name);
1408         if (get_protocol_http_header(discover->version, &buf)) {
1409                 rpc.protocol_header = strbuf_detach(&buf, NULL);
1410         } else {
1411                 rpc.protocol_header = NULL;
1412                 strbuf_release(&buf);
1413         }
1414         rpc.buf = xmalloc(http_post_buffer);
1415         rpc.alloc = http_post_buffer;
1416         rpc.len = 0;
1417         rpc.pos = 0;
1418         rpc.in = 1;
1419         rpc.out = 0;
1420         rpc.any_written = 0;
1421         rpc.gzip_request = 1;
1422         rpc.initial_buffer = 0;
1423         rpc.write_line_lengths = 1;
1424         rpc.flush_read_but_not_sent = 0;
1425
1426         /*
1427          * Dump the capability listing that we got from the server earlier
1428          * during the info/refs request.
1429          */
1430         write_or_die(rpc.in, discover->buf, discover->len);
1431
1432         /* Until we see EOF keep sending POSTs */
1433         while (1) {
1434                 size_t avail;
1435                 enum packet_read_status status;
1436
1437                 if (!rpc_read_from_out(&rpc, PACKET_READ_GENTLE_ON_EOF, &avail,
1438                                        &status))
1439                         BUG("The entire rpc->buf should be larger than LARGE_PACKET_MAX");
1440                 if (status == PACKET_READ_EOF)
1441                         break;
1442                 if (post_rpc(&rpc, 1, status == PACKET_READ_FLUSH))
1443                         /* We would have an err here */
1444                         break;
1445                 /* Reset the buffer for next request */
1446                 rpc.len = 0;
1447         }
1448
1449         free(rpc.service_url);
1450         free(rpc.hdr_content_type);
1451         free(rpc.hdr_accept);
1452         free(rpc.protocol_header);
1453         free(rpc.buf);
1454         strbuf_release(&buf);
1455
1456         return 0;
1457 }
1458
1459 int cmd_main(int argc, const char **argv)
1460 {
1461         struct strbuf buf = STRBUF_INIT;
1462         int nongit;
1463
1464         setup_git_directory_gently(&nongit);
1465         if (argc < 2) {
1466                 error(_("remote-curl: usage: git remote-curl <remote> [<url>]"));
1467                 return 1;
1468         }
1469
1470         options.verbosity = 1;
1471         options.progress = !!isatty(2);
1472         options.thin = 1;
1473         string_list_init(&options.deepen_not, 1);
1474         string_list_init(&options.push_options, 1);
1475
1476         /*
1477          * Just report "remote-curl" here (folding all the various aliases
1478          * ("git-remote-http", "git-remote-https", and etc.) here since they
1479          * are all just copies of the same actual executable.
1480          */
1481         trace2_cmd_name("remote-curl");
1482
1483         remote = remote_get(argv[1]);
1484
1485         if (argc > 2) {
1486                 end_url_with_slash(&url, argv[2]);
1487         } else {
1488                 end_url_with_slash(&url, remote->url[0]);
1489         }
1490
1491         http_init(remote, url.buf, 0);
1492
1493         do {
1494                 const char *arg;
1495
1496                 if (strbuf_getline_lf(&buf, stdin) == EOF) {
1497                         if (ferror(stdin))
1498                                 error(_("remote-curl: error reading command stream from git"));
1499                         return 1;
1500                 }
1501                 if (buf.len == 0)
1502                         break;
1503                 if (starts_with(buf.buf, "fetch ")) {
1504                         if (nongit)
1505                                 die(_("remote-curl: fetch attempted without a local repo"));
1506                         parse_fetch(&buf);
1507
1508                 } else if (!strcmp(buf.buf, "list") || starts_with(buf.buf, "list ")) {
1509                         int for_push = !!strstr(buf.buf + 4, "for-push");
1510                         output_refs(get_refs(for_push));
1511
1512                 } else if (starts_with(buf.buf, "push ")) {
1513                         parse_push(&buf);
1514
1515                 } else if (skip_prefix(buf.buf, "option ", &arg)) {
1516                         char *value = strchr(arg, ' ');
1517                         int result;
1518
1519                         if (value)
1520                                 *value++ = '\0';
1521                         else
1522                                 value = "true";
1523
1524                         result = set_option(arg, value);
1525                         if (!result)
1526                                 printf("ok\n");
1527                         else if (result < 0)
1528                                 printf("error invalid value\n");
1529                         else
1530                                 printf("unsupported\n");
1531                         fflush(stdout);
1532
1533                 } else if (!strcmp(buf.buf, "capabilities")) {
1534                         printf("stateless-connect\n");
1535                         printf("fetch\n");
1536                         printf("option\n");
1537                         printf("push\n");
1538                         printf("check-connectivity\n");
1539                         printf("object-format\n");
1540                         printf("\n");
1541                         fflush(stdout);
1542                 } else if (skip_prefix(buf.buf, "stateless-connect ", &arg)) {
1543                         if (!stateless_connect(arg))
1544                                 break;
1545                 } else {
1546                         error(_("remote-curl: unknown command '%s' from git"), buf.buf);
1547                         return 1;
1548                 }
1549                 strbuf_reset(&buf);
1550         } while (1);
1551
1552         http_cleanup();
1553
1554         return 0;
1555 }