Merge branch 'jh/trace2-sid-fix'
[git] / remote-curl.c
1 #include "cache.h"
2 #include "config.h"
3 #include "remote.h"
4 #include "connect.h"
5 #include "strbuf.h"
6 #include "walker.h"
7 #include "http.h"
8 #include "exec-cmd.h"
9 #include "run-command.h"
10 #include "pkt-line.h"
11 #include "string-list.h"
12 #include "sideband.h"
13 #include "argv-array.h"
14 #include "credential.h"
15 #include "sha1-array.h"
16 #include "send-pack.h"
17 #include "protocol.h"
18 #include "quote.h"
19 #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 };
45 static struct options options;
46 static struct string_list cas_options = STRING_LIST_INIT_DUP;
47
48 static int set_option(const char *name, const char *value)
49 {
50         if (!strcmp(name, "verbosity")) {
51                 char *end;
52                 int v = strtol(value, &end, 10);
53                 if (value == end || *end)
54                         return -1;
55                 options.verbosity = v;
56                 return 0;
57         }
58         else if (!strcmp(name, "progress")) {
59                 if (!strcmp(value, "true"))
60                         options.progress = 1;
61                 else if (!strcmp(value, "false"))
62                         options.progress = 0;
63                 else
64                         return -1;
65                 return 0;
66         }
67         else if (!strcmp(name, "depth")) {
68                 char *end;
69                 unsigned long v = strtoul(value, &end, 10);
70                 if (value == end || *end)
71                         return -1;
72                 options.depth = v;
73                 return 0;
74         }
75         else if (!strcmp(name, "deepen-since")) {
76                 options.deepen_since = xstrdup(value);
77                 return 0;
78         }
79         else if (!strcmp(name, "deepen-not")) {
80                 string_list_append(&options.deepen_not, value);
81                 return 0;
82         }
83         else if (!strcmp(name, "deepen-relative")) {
84                 if (!strcmp(value, "true"))
85                         options.deepen_relative = 1;
86                 else if (!strcmp(value, "false"))
87                         options.deepen_relative = 0;
88                 else
89                         return -1;
90                 return 0;
91         }
92         else if (!strcmp(name, "followtags")) {
93                 if (!strcmp(value, "true"))
94                         options.followtags = 1;
95                 else if (!strcmp(value, "false"))
96                         options.followtags = 0;
97                 else
98                         return -1;
99                 return 0;
100         }
101         else if (!strcmp(name, "dry-run")) {
102                 if (!strcmp(value, "true"))
103                         options.dry_run = 1;
104                 else if (!strcmp(value, "false"))
105                         options.dry_run = 0;
106                 else
107                         return -1;
108                 return 0;
109         }
110         else if (!strcmp(name, "check-connectivity")) {
111                 if (!strcmp(value, "true"))
112                         options.check_self_contained_and_connected = 1;
113                 else if (!strcmp(value, "false"))
114                         options.check_self_contained_and_connected = 0;
115                 else
116                         return -1;
117                 return 0;
118         }
119         else if (!strcmp(name, "cas")) {
120                 struct strbuf val = STRBUF_INIT;
121                 strbuf_addf(&val, "--" CAS_OPT_NAME "=%s", value);
122                 string_list_append(&cas_options, val.buf);
123                 strbuf_release(&val);
124                 return 0;
125         } else if (!strcmp(name, "cloning")) {
126                 if (!strcmp(value, "true"))
127                         options.cloning = 1;
128                 else if (!strcmp(value, "false"))
129                         options.cloning = 0;
130                 else
131                         return -1;
132                 return 0;
133         } else if (!strcmp(name, "update-shallow")) {
134                 if (!strcmp(value, "true"))
135                         options.update_shallow = 1;
136                 else if (!strcmp(value, "false"))
137                         options.update_shallow = 0;
138                 else
139                         return -1;
140                 return 0;
141         } else if (!strcmp(name, "pushcert")) {
142                 if (!strcmp(value, "true"))
143                         options.push_cert = SEND_PACK_PUSH_CERT_ALWAYS;
144                 else if (!strcmp(value, "false"))
145                         options.push_cert = SEND_PACK_PUSH_CERT_NEVER;
146                 else if (!strcmp(value, "if-asked"))
147                         options.push_cert = SEND_PACK_PUSH_CERT_IF_ASKED;
148                 else
149                         return -1;
150                 return 0;
151         } else if (!strcmp(name, "push-option")) {
152                 if (*value != '"')
153                         string_list_append(&options.push_options, value);
154                 else {
155                         struct strbuf unquoted = STRBUF_INIT;
156                         if (unquote_c_style(&unquoted, value, NULL) < 0)
157                                 die(_("invalid quoting in push-option value: '%s'"), value);
158                         string_list_append_nodup(&options.push_options,
159                                                  strbuf_detach(&unquoted, NULL));
160                 }
161                 return 0;
162
163 #if LIBCURL_VERSION_NUM >= 0x070a08
164         } else if (!strcmp(name, "family")) {
165                 if (!strcmp(value, "ipv4"))
166                         git_curl_ipresolve = CURL_IPRESOLVE_V4;
167                 else if (!strcmp(value, "ipv6"))
168                         git_curl_ipresolve = CURL_IPRESOLVE_V6;
169                 else if (!strcmp(value, "all"))
170                         git_curl_ipresolve = CURL_IPRESOLVE_WHATEVER;
171                 else
172                         return -1;
173                 return 0;
174 #endif /* LIBCURL_VERSION_NUM >= 0x070a08 */
175         } else if (!strcmp(name, "from-promisor")) {
176                 options.from_promisor = 1;
177                 return 0;
178         } else if (!strcmp(name, "no-dependents")) {
179                 options.no_dependents = 1;
180                 return 0;
181         } else if (!strcmp(name, "filter")) {
182                 options.filter = xstrdup(value);
183                 return 0;
184         } else {
185                 return 1 /* unsupported */;
186         }
187 }
188
189 struct discovery {
190         char *service;
191         char *buf_alloc;
192         char *buf;
193         size_t len;
194         struct ref *refs;
195         struct oid_array shallow;
196         enum protocol_version version;
197         unsigned proto_git : 1;
198 };
199 static struct discovery *last_discovery;
200
201 static struct ref *parse_git_refs(struct discovery *heads, int for_push)
202 {
203         struct ref *list = NULL;
204         struct packet_reader reader;
205
206         packet_reader_init(&reader, -1, heads->buf, heads->len,
207                            PACKET_READ_CHOMP_NEWLINE |
208                            PACKET_READ_GENTLE_ON_EOF |
209                            PACKET_READ_DIE_ON_ERR_PACKET);
210
211         heads->version = discover_version(&reader);
212         switch (heads->version) {
213         case protocol_v2:
214                 /*
215                  * Do nothing.  This isn't a list of refs but rather a
216                  * capability advertisement.  Client would have run
217                  * 'stateless-connect' so we'll dump this capability listing
218                  * and let them request the refs themselves.
219                  */
220                 break;
221         case protocol_v1:
222         case protocol_v0:
223                 get_remote_heads(&reader, &list, for_push ? REF_NORMAL : 0,
224                                  NULL, &heads->shallow);
225                 break;
226         case protocol_unknown_version:
227                 BUG("unknown protocol version");
228         }
229
230         return list;
231 }
232
233 static struct ref *parse_info_refs(struct discovery *heads)
234 {
235         char *data, *start, *mid;
236         char *ref_name;
237         int i = 0;
238
239         struct ref *refs = NULL;
240         struct ref *ref = NULL;
241         struct ref *last_ref = NULL;
242
243         data = heads->buf;
244         start = NULL;
245         mid = data;
246         while (i < heads->len) {
247                 if (!start) {
248                         start = &data[i];
249                 }
250                 if (data[i] == '\t')
251                         mid = &data[i];
252                 if (data[i] == '\n') {
253                         if (mid - start != the_hash_algo->hexsz)
254                                 die(_("%sinfo/refs not valid: is this a git repository?"),
255                                     transport_anonymize_url(url.buf));
256                         data[i] = 0;
257                         ref_name = mid + 1;
258                         ref = alloc_ref(ref_name);
259                         get_oid_hex(start, &ref->old_oid);
260                         if (!refs)
261                                 refs = ref;
262                         if (last_ref)
263                                 last_ref->next = ref;
264                         last_ref = ref;
265                         start = NULL;
266                 }
267                 i++;
268         }
269
270         ref = alloc_ref("HEAD");
271         if (!http_fetch_ref(url.buf, ref) &&
272             !resolve_remote_symref(ref, refs)) {
273                 ref->next = refs;
274                 refs = ref;
275         } else {
276                 free(ref);
277         }
278
279         return refs;
280 }
281
282 static void free_discovery(struct discovery *d)
283 {
284         if (d) {
285                 if (d == last_discovery)
286                         last_discovery = NULL;
287                 free(d->shallow.oid);
288                 free(d->buf_alloc);
289                 free_refs(d->refs);
290                 free(d->service);
291                 free(d);
292         }
293 }
294
295 static int show_http_message(struct strbuf *type, struct strbuf *charset,
296                              struct strbuf *msg)
297 {
298         const char *p, *eol;
299
300         /*
301          * We only show text/plain parts, as other types are likely
302          * to be ugly to look at on the user's terminal.
303          */
304         if (strcmp(type->buf, "text/plain"))
305                 return -1;
306         if (charset->len)
307                 strbuf_reencode(msg, charset->buf, get_log_output_encoding());
308
309         strbuf_trim(msg);
310         if (!msg->len)
311                 return -1;
312
313         p = msg->buf;
314         do {
315                 eol = strchrnul(p, '\n');
316                 fprintf(stderr, "remote: %.*s\n", (int)(eol - p), p);
317                 p = eol + 1;
318         } while(*eol);
319         return 0;
320 }
321
322 static int get_protocol_http_header(enum protocol_version version,
323                                     struct strbuf *header)
324 {
325         if (version > 0) {
326                 strbuf_addf(header, GIT_PROTOCOL_HEADER ": version=%d",
327                             version);
328
329                 return 1;
330         }
331
332         return 0;
333 }
334
335 static void check_smart_http(struct discovery *d, const char *service,
336                              struct strbuf *type)
337 {
338         const char *p;
339         struct packet_reader reader;
340
341         /*
342          * If we don't see x-$service-advertisement, then it's not smart-http.
343          * But once we do, we commit to it and assume any other protocol
344          * violations are hard errors.
345          */
346         if (!skip_prefix(type->buf, "application/x-", &p) ||
347             !skip_prefix(p, service, &p) ||
348             strcmp(p, "-advertisement"))
349                 return;
350
351         packet_reader_init(&reader, -1, d->buf, d->len,
352                            PACKET_READ_CHOMP_NEWLINE |
353                            PACKET_READ_DIE_ON_ERR_PACKET);
354         if (packet_reader_read(&reader) != PACKET_READ_NORMAL)
355                 die(_("invalid server response; expected service, got flush packet"));
356
357         if (skip_prefix(reader.line, "# service=", &p) && !strcmp(p, service)) {
358                 /*
359                  * The header can include additional metadata lines, up
360                  * until a packet flush marker.  Ignore these now, but
361                  * in the future we might start to scan them.
362                  */
363                 for (;;) {
364                         packet_reader_read(&reader);
365                         if (reader.pktlen <= 0) {
366                                 break;
367                         }
368                 }
369
370                 /*
371                  * v0 smart http; callers expect us to soak up the
372                  * service and header packets
373                  */
374                 d->buf = reader.src_buffer;
375                 d->len = reader.src_len;
376                 d->proto_git = 1;
377
378         } else if (!strcmp(reader.line, "version 2")) {
379                 /*
380                  * v2 smart http; do not consume version packet, which will
381                  * be handled elsewhere.
382                  */
383                 d->proto_git = 1;
384
385         } else {
386                 die(_("invalid server response; got '%s'"), reader.line);
387         }
388 }
389
390 static struct discovery *discover_refs(const char *service, int for_push)
391 {
392         struct strbuf type = STRBUF_INIT;
393         struct strbuf charset = STRBUF_INIT;
394         struct strbuf buffer = STRBUF_INIT;
395         struct strbuf refs_url = STRBUF_INIT;
396         struct strbuf effective_url = STRBUF_INIT;
397         struct strbuf protocol_header = STRBUF_INIT;
398         struct string_list extra_headers = STRING_LIST_INIT_DUP;
399         struct discovery *last = last_discovery;
400         int http_ret, maybe_smart = 0;
401         struct http_get_options http_options;
402         enum protocol_version version = get_protocol_version_config();
403
404         if (last && !strcmp(service, last->service))
405                 return last;
406         free_discovery(last);
407
408         strbuf_addf(&refs_url, "%sinfo/refs", url.buf);
409         if ((starts_with(url.buf, "http://") || starts_with(url.buf, "https://")) &&
410              git_env_bool("GIT_SMART_HTTP", 1)) {
411                 maybe_smart = 1;
412                 if (!strchr(url.buf, '?'))
413                         strbuf_addch(&refs_url, '?');
414                 else
415                         strbuf_addch(&refs_url, '&');
416                 strbuf_addf(&refs_url, "service=%s", service);
417         }
418
419         /*
420          * NEEDSWORK: If we are trying to use protocol v2 and we are planning
421          * to perform a push, then fallback to v0 since the client doesn't know
422          * how to push yet using v2.
423          */
424         if (version == protocol_v2 && !strcmp("git-receive-pack", service))
425                 version = protocol_v0;
426
427         /* Add the extra Git-Protocol header */
428         if (get_protocol_http_header(version, &protocol_header))
429                 string_list_append(&extra_headers, protocol_header.buf);
430
431         memset(&http_options, 0, sizeof(http_options));
432         http_options.content_type = &type;
433         http_options.charset = &charset;
434         http_options.effective_url = &effective_url;
435         http_options.base_url = &url;
436         http_options.extra_headers = &extra_headers;
437         http_options.initial_request = 1;
438         http_options.no_cache = 1;
439
440         http_ret = http_get_strbuf(refs_url.buf, &buffer, &http_options);
441         switch (http_ret) {
442         case HTTP_OK:
443                 break;
444         case HTTP_MISSING_TARGET:
445                 show_http_message(&type, &charset, &buffer);
446                 die(_("repository '%s' not found"),
447                     transport_anonymize_url(url.buf));
448         case HTTP_NOAUTH:
449                 show_http_message(&type, &charset, &buffer);
450                 die(_("Authentication failed for '%s'"),
451                     transport_anonymize_url(url.buf));
452         default:
453                 show_http_message(&type, &charset, &buffer);
454                 die(_("unable to access '%s': %s"),
455                     transport_anonymize_url(url.buf), curl_errorstr);
456         }
457
458         if (options.verbosity && !starts_with(refs_url.buf, url.buf)) {
459                 char *u = transport_anonymize_url(url.buf);
460                 warning(_("redirecting to %s"), u);
461                 free(u);
462         }
463
464         last= xcalloc(1, sizeof(*last_discovery));
465         last->service = xstrdup(service);
466         last->buf_alloc = strbuf_detach(&buffer, &last->len);
467         last->buf = last->buf_alloc;
468
469         if (maybe_smart)
470                 check_smart_http(last, service, &type);
471
472         if (last->proto_git)
473                 last->refs = parse_git_refs(last, for_push);
474         else
475                 last->refs = parse_info_refs(last);
476
477         strbuf_release(&refs_url);
478         strbuf_release(&type);
479         strbuf_release(&charset);
480         strbuf_release(&effective_url);
481         strbuf_release(&buffer);
482         strbuf_release(&protocol_header);
483         string_list_clear(&extra_headers, 0);
484         last_discovery = last;
485         return last;
486 }
487
488 static struct ref *get_refs(int for_push)
489 {
490         struct discovery *heads;
491
492         if (for_push)
493                 heads = discover_refs("git-receive-pack", for_push);
494         else
495                 heads = discover_refs("git-upload-pack", for_push);
496
497         return heads->refs;
498 }
499
500 static void output_refs(struct ref *refs)
501 {
502         struct ref *posn;
503         for (posn = refs; posn; posn = posn->next) {
504                 if (posn->symref)
505                         printf("@%s %s\n", posn->symref, posn->name);
506                 else
507                         printf("%s %s\n", oid_to_hex(&posn->old_oid), posn->name);
508         }
509         printf("\n");
510         fflush(stdout);
511 }
512
513 struct rpc_state {
514         const char *service_name;
515         char *service_url;
516         char *hdr_content_type;
517         char *hdr_accept;
518         char *protocol_header;
519         char *buf;
520         size_t alloc;
521         size_t len;
522         size_t pos;
523         int in;
524         int out;
525         int any_written;
526         unsigned gzip_request : 1;
527         unsigned initial_buffer : 1;
528
529         /*
530          * Whenever a pkt-line is read into buf, append the 4 characters
531          * denoting its length before appending the payload.
532          */
533         unsigned write_line_lengths : 1;
534
535         /*
536          * Used by rpc_out; initialize to 0. This is true if a flush has been
537          * read, but the corresponding line length (if write_line_lengths is
538          * true) and EOF have not been sent to libcurl. Since each flush marks
539          * the end of a request, each flush must be completely sent before any
540          * further reading occurs.
541          */
542         unsigned flush_read_but_not_sent : 1;
543 };
544
545 /*
546  * Appends the result of reading from rpc->out to the string represented by
547  * rpc->buf and rpc->len if there is enough space. Returns 1 if there was
548  * enough space, 0 otherwise.
549  *
550  * If rpc->write_line_lengths is true, appends the line length as a 4-byte
551  * hexadecimal string before appending the result described above.
552  *
553  * Writes the total number of bytes appended into appended.
554  */
555 static int rpc_read_from_out(struct rpc_state *rpc, int options,
556                              size_t *appended,
557                              enum packet_read_status *status) {
558         size_t left;
559         char *buf;
560         int pktlen_raw;
561
562         if (rpc->write_line_lengths) {
563                 left = rpc->alloc - rpc->len - 4;
564                 buf = rpc->buf + rpc->len + 4;
565         } else {
566                 left = rpc->alloc - rpc->len;
567                 buf = rpc->buf + rpc->len;
568         }
569
570         if (left < LARGE_PACKET_MAX)
571                 return 0;
572
573         *status = packet_read_with_status(rpc->out, NULL, NULL, buf,
574                         left, &pktlen_raw, options);
575         if (*status != PACKET_READ_EOF) {
576                 *appended = pktlen_raw + (rpc->write_line_lengths ? 4 : 0);
577                 rpc->len += *appended;
578         }
579
580         if (rpc->write_line_lengths) {
581                 switch (*status) {
582                 case PACKET_READ_EOF:
583                         if (!(options & PACKET_READ_GENTLE_ON_EOF))
584                                 die(_("shouldn't have EOF when not gentle on EOF"));
585                         break;
586                 case PACKET_READ_NORMAL:
587                         set_packet_header(buf - 4, *appended);
588                         break;
589                 case PACKET_READ_DELIM:
590                         memcpy(buf - 4, "0001", 4);
591                         break;
592                 case PACKET_READ_FLUSH:
593                         memcpy(buf - 4, "0000", 4);
594                         break;
595                 }
596         }
597
598         return 1;
599 }
600
601 static size_t rpc_out(void *ptr, size_t eltsize,
602                 size_t nmemb, void *buffer_)
603 {
604         size_t max = eltsize * nmemb;
605         struct rpc_state *rpc = buffer_;
606         size_t avail = rpc->len - rpc->pos;
607         enum packet_read_status status;
608
609         if (!avail) {
610                 rpc->initial_buffer = 0;
611                 rpc->len = 0;
612                 rpc->pos = 0;
613                 if (!rpc->flush_read_but_not_sent) {
614                         if (!rpc_read_from_out(rpc, 0, &avail, &status))
615                                 BUG("The entire rpc->buf should be larger than LARGE_PACKET_MAX");
616                         if (status == PACKET_READ_FLUSH)
617                                 rpc->flush_read_but_not_sent = 1;
618                 }
619                 /*
620                  * If flush_read_but_not_sent is true, we have already read one
621                  * full request but have not fully sent it + EOF, which is why
622                  * we need to refrain from reading.
623                  */
624         }
625         if (rpc->flush_read_but_not_sent) {
626                 if (!avail) {
627                         /*
628                          * The line length either does not need to be sent at
629                          * all or has already been completely sent. Now we can
630                          * return 0, indicating EOF, meaning that the flush has
631                          * been fully sent.
632                          */
633                         rpc->flush_read_but_not_sent = 0;
634                         return 0;
635                 }
636                 /*
637                  * If avail is non-zerp, the line length for the flush still
638                  * hasn't been fully sent. Proceed with sending the line
639                  * length.
640                  */
641         }
642
643         if (max < avail)
644                 avail = max;
645         memcpy(ptr, rpc->buf + rpc->pos, avail);
646         rpc->pos += avail;
647         return avail;
648 }
649
650 #ifndef NO_CURL_IOCTL
651 static curlioerr rpc_ioctl(CURL *handle, int cmd, void *clientp)
652 {
653         struct rpc_state *rpc = clientp;
654
655         switch (cmd) {
656         case CURLIOCMD_NOP:
657                 return CURLIOE_OK;
658
659         case CURLIOCMD_RESTARTREAD:
660                 if (rpc->initial_buffer) {
661                         rpc->pos = 0;
662                         return CURLIOE_OK;
663                 }
664                 error(_("unable to rewind rpc post data - try increasing http.postBuffer"));
665                 return CURLIOE_FAILRESTART;
666
667         default:
668                 return CURLIOE_UNKNOWNCMD;
669         }
670 }
671 #endif
672
673 struct rpc_in_data {
674         struct rpc_state *rpc;
675         struct active_request_slot *slot;
676 };
677
678 /*
679  * A callback for CURLOPT_WRITEFUNCTION. The return value is the bytes consumed
680  * from ptr.
681  */
682 static size_t rpc_in(char *ptr, size_t eltsize,
683                 size_t nmemb, void *buffer_)
684 {
685         size_t size = eltsize * nmemb;
686         struct rpc_in_data *data = buffer_;
687         long response_code;
688
689         if (curl_easy_getinfo(data->slot->curl, CURLINFO_RESPONSE_CODE,
690                               &response_code) != CURLE_OK)
691                 return size;
692         if (response_code >= 300)
693                 return size;
694         if (size)
695                 data->rpc->any_written = 1;
696         write_or_die(data->rpc->in, ptr, size);
697         return size;
698 }
699
700 static int run_slot(struct active_request_slot *slot,
701                     struct slot_results *results)
702 {
703         int err;
704         struct slot_results results_buf;
705
706         if (!results)
707                 results = &results_buf;
708
709         err = run_one_slot(slot, results);
710
711         if (err != HTTP_OK && err != HTTP_REAUTH) {
712                 struct strbuf msg = STRBUF_INIT;
713                 if (results->http_code && results->http_code != 200)
714                         strbuf_addf(&msg, "HTTP %ld", results->http_code);
715                 if (results->curl_result != CURLE_OK) {
716                         if (msg.len)
717                                 strbuf_addch(&msg, ' ');
718                         strbuf_addf(&msg, "curl %d", results->curl_result);
719                         if (curl_errorstr[0]) {
720                                 strbuf_addch(&msg, ' ');
721                                 strbuf_addstr(&msg, curl_errorstr);
722                         }
723                 }
724                 error(_("RPC failed; %s"), msg.buf);
725                 strbuf_release(&msg);
726         }
727
728         return err;
729 }
730
731 static int probe_rpc(struct rpc_state *rpc, struct slot_results *results)
732 {
733         struct active_request_slot *slot;
734         struct curl_slist *headers = http_copy_default_headers();
735         struct strbuf buf = STRBUF_INIT;
736         int err;
737
738         slot = get_active_slot();
739
740         headers = curl_slist_append(headers, rpc->hdr_content_type);
741         headers = curl_slist_append(headers, rpc->hdr_accept);
742
743         curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
744         curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
745         curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
746         curl_easy_setopt(slot->curl, CURLOPT_ENCODING, NULL);
747         curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, "0000");
748         curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, 4);
749         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
750         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
751         curl_easy_setopt(slot->curl, CURLOPT_FILE, &buf);
752
753         err = run_slot(slot, results);
754
755         curl_slist_free_all(headers);
756         strbuf_release(&buf);
757         return err;
758 }
759
760 static curl_off_t xcurl_off_t(size_t len)
761 {
762         uintmax_t size = len;
763         if (size > maximum_signed_value_of_type(curl_off_t))
764                 die(_("cannot handle pushes this big"));
765         return (curl_off_t)size;
766 }
767
768 /*
769  * If flush_received is true, do not attempt to read any more; just use what's
770  * in rpc->buf.
771  */
772 static int post_rpc(struct rpc_state *rpc, int flush_received)
773 {
774         struct active_request_slot *slot;
775         struct curl_slist *headers = http_copy_default_headers();
776         int use_gzip = rpc->gzip_request;
777         char *gzip_body = NULL;
778         size_t gzip_size = 0;
779         int err, large_request = 0;
780         int needs_100_continue = 0;
781         struct rpc_in_data rpc_in_data;
782
783         /* Try to load the entire request, if we can fit it into the
784          * allocated buffer space we can use HTTP/1.0 and avoid the
785          * chunked encoding mess.
786          */
787         if (!flush_received) {
788                 while (1) {
789                         size_t n;
790                         enum packet_read_status status;
791
792                         if (!rpc_read_from_out(rpc, 0, &n, &status)) {
793                                 large_request = 1;
794                                 use_gzip = 0;
795                                 break;
796                         }
797                         if (status == PACKET_READ_FLUSH)
798                                 break;
799                 }
800         }
801
802         if (large_request) {
803                 struct slot_results results;
804
805                 do {
806                         err = probe_rpc(rpc, &results);
807                         if (err == HTTP_REAUTH)
808                                 credential_fill(&http_auth);
809                 } while (err == HTTP_REAUTH);
810                 if (err != HTTP_OK)
811                         return -1;
812
813                 if (results.auth_avail & CURLAUTH_GSSNEGOTIATE)
814                         needs_100_continue = 1;
815         }
816
817         headers = curl_slist_append(headers, rpc->hdr_content_type);
818         headers = curl_slist_append(headers, rpc->hdr_accept);
819         headers = curl_slist_append(headers, needs_100_continue ?
820                 "Expect: 100-continue" : "Expect:");
821
822         /* Add the extra Git-Protocol header */
823         if (rpc->protocol_header)
824                 headers = curl_slist_append(headers, rpc->protocol_header);
825
826 retry:
827         slot = get_active_slot();
828
829         curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
830         curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
831         curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
832         curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "");
833
834         if (large_request) {
835                 /* The request body is large and the size cannot be predicted.
836                  * We must use chunked encoding to send it.
837                  */
838                 headers = curl_slist_append(headers, "Transfer-Encoding: chunked");
839                 rpc->initial_buffer = 1;
840                 curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, rpc_out);
841                 curl_easy_setopt(slot->curl, CURLOPT_INFILE, rpc);
842 #ifndef NO_CURL_IOCTL
843                 curl_easy_setopt(slot->curl, CURLOPT_IOCTLFUNCTION, rpc_ioctl);
844                 curl_easy_setopt(slot->curl, CURLOPT_IOCTLDATA, rpc);
845 #endif
846                 if (options.verbosity > 1) {
847                         fprintf(stderr, "POST %s (chunked)\n", rpc->service_name);
848                         fflush(stderr);
849                 }
850
851         } else if (gzip_body) {
852                 /*
853                  * If we are looping to retry authentication, then the previous
854                  * run will have set up the headers and gzip buffer already,
855                  * and we just need to send it.
856                  */
857                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);
858                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE_LARGE, xcurl_off_t(gzip_size));
859
860         } else if (use_gzip && 1024 < rpc->len) {
861                 /* The client backend isn't giving us compressed data so
862                  * we can try to deflate it ourselves, this may save on
863                  * the transfer time.
864                  */
865                 git_zstream stream;
866                 int ret;
867
868                 git_deflate_init_gzip(&stream, Z_BEST_COMPRESSION);
869                 gzip_size = git_deflate_bound(&stream, rpc->len);
870                 gzip_body = xmalloc(gzip_size);
871
872                 stream.next_in = (unsigned char *)rpc->buf;
873                 stream.avail_in = rpc->len;
874                 stream.next_out = (unsigned char *)gzip_body;
875                 stream.avail_out = gzip_size;
876
877                 ret = git_deflate(&stream, Z_FINISH);
878                 if (ret != Z_STREAM_END)
879                         die(_("cannot deflate request; zlib deflate error %d"), ret);
880
881                 ret = git_deflate_end_gently(&stream);
882                 if (ret != Z_OK)
883                         die(_("cannot deflate request; zlib end error %d"), ret);
884
885                 gzip_size = stream.total_out;
886
887                 headers = curl_slist_append(headers, "Content-Encoding: gzip");
888                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);
889                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE_LARGE, xcurl_off_t(gzip_size));
890
891                 if (options.verbosity > 1) {
892                         fprintf(stderr, "POST %s (gzip %lu to %lu bytes)\n",
893                                 rpc->service_name,
894                                 (unsigned long)rpc->len, (unsigned long)gzip_size);
895                         fflush(stderr);
896                 }
897         } else {
898                 /* We know the complete request size in advance, use the
899                  * more normal Content-Length approach.
900                  */
901                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, rpc->buf);
902                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE_LARGE, xcurl_off_t(rpc->len));
903                 if (options.verbosity > 1) {
904                         fprintf(stderr, "POST %s (%lu bytes)\n",
905                                 rpc->service_name, (unsigned long)rpc->len);
906                         fflush(stderr);
907                 }
908         }
909
910         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
911         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, rpc_in);
912         rpc_in_data.rpc = rpc;
913         rpc_in_data.slot = slot;
914         curl_easy_setopt(slot->curl, CURLOPT_FILE, &rpc_in_data);
915         curl_easy_setopt(slot->curl, CURLOPT_FAILONERROR, 0);
916
917
918         rpc->any_written = 0;
919         err = run_slot(slot, NULL);
920         if (err == HTTP_REAUTH && !large_request) {
921                 credential_fill(&http_auth);
922                 goto retry;
923         }
924         if (err != HTTP_OK)
925                 err = -1;
926
927         if (!rpc->any_written)
928                 err = -1;
929
930         curl_slist_free_all(headers);
931         free(gzip_body);
932         return err;
933 }
934
935 static int rpc_service(struct rpc_state *rpc, struct discovery *heads,
936                        const char **client_argv, const struct strbuf *preamble,
937                        struct strbuf *rpc_result)
938 {
939         const char *svc = rpc->service_name;
940         struct strbuf buf = STRBUF_INIT;
941         struct child_process client = CHILD_PROCESS_INIT;
942         int err = 0;
943
944         client.in = -1;
945         client.out = -1;
946         client.git_cmd = 1;
947         client.argv = client_argv;
948         if (start_command(&client))
949                 exit(1);
950         write_or_die(client.in, preamble->buf, preamble->len);
951         if (heads)
952                 write_or_die(client.in, heads->buf, heads->len);
953
954         rpc->alloc = http_post_buffer;
955         rpc->buf = xmalloc(rpc->alloc);
956         rpc->in = client.in;
957         rpc->out = client.out;
958
959         strbuf_addf(&buf, "%s%s", url.buf, svc);
960         rpc->service_url = strbuf_detach(&buf, NULL);
961
962         strbuf_addf(&buf, "Content-Type: application/x-%s-request", svc);
963         rpc->hdr_content_type = strbuf_detach(&buf, NULL);
964
965         strbuf_addf(&buf, "Accept: application/x-%s-result", svc);
966         rpc->hdr_accept = strbuf_detach(&buf, NULL);
967
968         if (get_protocol_http_header(heads->version, &buf))
969                 rpc->protocol_header = strbuf_detach(&buf, NULL);
970         else
971                 rpc->protocol_header = NULL;
972
973         while (!err) {
974                 int n = packet_read(rpc->out, NULL, NULL, rpc->buf, rpc->alloc, 0);
975                 if (!n)
976                         break;
977                 rpc->pos = 0;
978                 rpc->len = n;
979                 err |= post_rpc(rpc, 0);
980         }
981
982         close(client.in);
983         client.in = -1;
984         if (!err) {
985                 strbuf_read(rpc_result, client.out, 0);
986         } else {
987                 char buf[4096];
988                 for (;;)
989                         if (xread(client.out, buf, sizeof(buf)) <= 0)
990                                 break;
991         }
992
993         close(client.out);
994         client.out = -1;
995
996         err |= finish_command(&client);
997         free(rpc->service_url);
998         free(rpc->hdr_content_type);
999         free(rpc->hdr_accept);
1000         free(rpc->protocol_header);
1001         free(rpc->buf);
1002         strbuf_release(&buf);
1003         return err;
1004 }
1005
1006 static int fetch_dumb(int nr_heads, struct ref **to_fetch)
1007 {
1008         struct walker *walker;
1009         char **targets;
1010         int ret, i;
1011
1012         ALLOC_ARRAY(targets, nr_heads);
1013         if (options.depth || options.deepen_since)
1014                 die(_("dumb http transport does not support shallow capabilities"));
1015         for (i = 0; i < nr_heads; i++)
1016                 targets[i] = xstrdup(oid_to_hex(&to_fetch[i]->old_oid));
1017
1018         walker = get_http_walker(url.buf);
1019         walker->get_verbosely = options.verbosity >= 3;
1020         walker->get_recover = 0;
1021         ret = walker_fetch(walker, nr_heads, targets, NULL, NULL);
1022         walker_free(walker);
1023
1024         for (i = 0; i < nr_heads; i++)
1025                 free(targets[i]);
1026         free(targets);
1027
1028         return ret ? error(_("fetch failed.")) : 0;
1029 }
1030
1031 static int fetch_git(struct discovery *heads,
1032         int nr_heads, struct ref **to_fetch)
1033 {
1034         struct rpc_state rpc;
1035         struct strbuf preamble = STRBUF_INIT;
1036         int i, err;
1037         struct argv_array args = ARGV_ARRAY_INIT;
1038         struct strbuf rpc_result = STRBUF_INIT;
1039
1040         argv_array_pushl(&args, "fetch-pack", "--stateless-rpc",
1041                          "--stdin", "--lock-pack", NULL);
1042         if (options.followtags)
1043                 argv_array_push(&args, "--include-tag");
1044         if (options.thin)
1045                 argv_array_push(&args, "--thin");
1046         if (options.verbosity >= 3)
1047                 argv_array_pushl(&args, "-v", "-v", NULL);
1048         if (options.check_self_contained_and_connected)
1049                 argv_array_push(&args, "--check-self-contained-and-connected");
1050         if (options.cloning)
1051                 argv_array_push(&args, "--cloning");
1052         if (options.update_shallow)
1053                 argv_array_push(&args, "--update-shallow");
1054         if (!options.progress)
1055                 argv_array_push(&args, "--no-progress");
1056         if (options.depth)
1057                 argv_array_pushf(&args, "--depth=%lu", options.depth);
1058         if (options.deepen_since)
1059                 argv_array_pushf(&args, "--shallow-since=%s", options.deepen_since);
1060         for (i = 0; i < options.deepen_not.nr; i++)
1061                 argv_array_pushf(&args, "--shallow-exclude=%s",
1062                                  options.deepen_not.items[i].string);
1063         if (options.deepen_relative && options.depth)
1064                 argv_array_push(&args, "--deepen-relative");
1065         if (options.from_promisor)
1066                 argv_array_push(&args, "--from-promisor");
1067         if (options.no_dependents)
1068                 argv_array_push(&args, "--no-dependents");
1069         if (options.filter)
1070                 argv_array_pushf(&args, "--filter=%s", options.filter);
1071         argv_array_push(&args, url.buf);
1072
1073         for (i = 0; i < nr_heads; i++) {
1074                 struct ref *ref = to_fetch[i];
1075                 if (!*ref->name)
1076                         die(_("cannot fetch by sha1 over smart http"));
1077                 packet_buf_write(&preamble, "%s %s\n",
1078                                  oid_to_hex(&ref->old_oid), ref->name);
1079         }
1080         packet_buf_flush(&preamble);
1081
1082         memset(&rpc, 0, sizeof(rpc));
1083         rpc.service_name = "git-upload-pack",
1084         rpc.gzip_request = 1;
1085
1086         err = rpc_service(&rpc, heads, args.argv, &preamble, &rpc_result);
1087         if (rpc_result.len)
1088                 write_or_die(1, rpc_result.buf, rpc_result.len);
1089         strbuf_release(&rpc_result);
1090         strbuf_release(&preamble);
1091         argv_array_clear(&args);
1092         return err;
1093 }
1094
1095 static int fetch(int nr_heads, struct ref **to_fetch)
1096 {
1097         struct discovery *d = discover_refs("git-upload-pack", 0);
1098         if (d->proto_git)
1099                 return fetch_git(d, nr_heads, to_fetch);
1100         else
1101                 return fetch_dumb(nr_heads, to_fetch);
1102 }
1103
1104 static void parse_fetch(struct strbuf *buf)
1105 {
1106         struct ref **to_fetch = NULL;
1107         struct ref *list_head = NULL;
1108         struct ref **list = &list_head;
1109         int alloc_heads = 0, nr_heads = 0;
1110
1111         do {
1112                 const char *p;
1113                 if (skip_prefix(buf->buf, "fetch ", &p)) {
1114                         const char *name;
1115                         struct ref *ref;
1116                         struct object_id old_oid;
1117                         const char *q;
1118
1119                         if (parse_oid_hex(p, &old_oid, &q))
1120                                 die(_("protocol error: expected sha/ref, got %s'"), p);
1121                         if (*q == ' ')
1122                                 name = q + 1;
1123                         else if (!*q)
1124                                 name = "";
1125                         else
1126                                 die(_("protocol error: expected sha/ref, got %s'"), p);
1127
1128                         ref = alloc_ref(name);
1129                         oidcpy(&ref->old_oid, &old_oid);
1130
1131                         *list = ref;
1132                         list = &ref->next;
1133
1134                         ALLOC_GROW(to_fetch, nr_heads + 1, alloc_heads);
1135                         to_fetch[nr_heads++] = ref;
1136                 }
1137                 else
1138                         die(_("http transport does not support %s"), buf->buf);
1139
1140                 strbuf_reset(buf);
1141                 if (strbuf_getline_lf(buf, stdin) == EOF)
1142                         return;
1143                 if (!*buf->buf)
1144                         break;
1145         } while (1);
1146
1147         if (fetch(nr_heads, to_fetch))
1148                 exit(128); /* error already reported */
1149         free_refs(list_head);
1150         free(to_fetch);
1151
1152         printf("\n");
1153         fflush(stdout);
1154         strbuf_reset(buf);
1155 }
1156
1157 static int push_dav(int nr_spec, char **specs)
1158 {
1159         struct child_process child = CHILD_PROCESS_INIT;
1160         size_t i;
1161
1162         child.git_cmd = 1;
1163         argv_array_push(&child.args, "http-push");
1164         argv_array_push(&child.args, "--helper-status");
1165         if (options.dry_run)
1166                 argv_array_push(&child.args, "--dry-run");
1167         if (options.verbosity > 1)
1168                 argv_array_push(&child.args, "--verbose");
1169         argv_array_push(&child.args, url.buf);
1170         for (i = 0; i < nr_spec; i++)
1171                 argv_array_push(&child.args, specs[i]);
1172
1173         if (run_command(&child))
1174                 die(_("git-http-push failed"));
1175         return 0;
1176 }
1177
1178 static int push_git(struct discovery *heads, int nr_spec, char **specs)
1179 {
1180         struct rpc_state rpc;
1181         int i, err;
1182         struct argv_array args;
1183         struct string_list_item *cas_option;
1184         struct strbuf preamble = STRBUF_INIT;
1185         struct strbuf rpc_result = STRBUF_INIT;
1186
1187         argv_array_init(&args);
1188         argv_array_pushl(&args, "send-pack", "--stateless-rpc", "--helper-status",
1189                          NULL);
1190
1191         if (options.thin)
1192                 argv_array_push(&args, "--thin");
1193         if (options.dry_run)
1194                 argv_array_push(&args, "--dry-run");
1195         if (options.push_cert == SEND_PACK_PUSH_CERT_ALWAYS)
1196                 argv_array_push(&args, "--signed=yes");
1197         else if (options.push_cert == SEND_PACK_PUSH_CERT_IF_ASKED)
1198                 argv_array_push(&args, "--signed=if-asked");
1199         if (options.verbosity == 0)
1200                 argv_array_push(&args, "--quiet");
1201         else if (options.verbosity > 1)
1202                 argv_array_push(&args, "--verbose");
1203         for (i = 0; i < options.push_options.nr; i++)
1204                 argv_array_pushf(&args, "--push-option=%s",
1205                                  options.push_options.items[i].string);
1206         argv_array_push(&args, options.progress ? "--progress" : "--no-progress");
1207         for_each_string_list_item(cas_option, &cas_options)
1208                 argv_array_push(&args, cas_option->string);
1209         argv_array_push(&args, url.buf);
1210
1211         argv_array_push(&args, "--stdin");
1212         for (i = 0; i < nr_spec; i++)
1213                 packet_buf_write(&preamble, "%s\n", specs[i]);
1214         packet_buf_flush(&preamble);
1215
1216         memset(&rpc, 0, sizeof(rpc));
1217         rpc.service_name = "git-receive-pack",
1218
1219         err = rpc_service(&rpc, heads, args.argv, &preamble, &rpc_result);
1220         if (rpc_result.len)
1221                 write_or_die(1, rpc_result.buf, rpc_result.len);
1222         strbuf_release(&rpc_result);
1223         strbuf_release(&preamble);
1224         argv_array_clear(&args);
1225         return err;
1226 }
1227
1228 static int push(int nr_spec, char **specs)
1229 {
1230         struct discovery *heads = discover_refs("git-receive-pack", 1);
1231         int ret;
1232
1233         if (heads->proto_git)
1234                 ret = push_git(heads, nr_spec, specs);
1235         else
1236                 ret = push_dav(nr_spec, specs);
1237         free_discovery(heads);
1238         return ret;
1239 }
1240
1241 static void parse_push(struct strbuf *buf)
1242 {
1243         char **specs = NULL;
1244         int alloc_spec = 0, nr_spec = 0, i, ret;
1245
1246         do {
1247                 if (starts_with(buf->buf, "push ")) {
1248                         ALLOC_GROW(specs, nr_spec + 1, alloc_spec);
1249                         specs[nr_spec++] = xstrdup(buf->buf + 5);
1250                 }
1251                 else
1252                         die(_("http transport does not support %s"), buf->buf);
1253
1254                 strbuf_reset(buf);
1255                 if (strbuf_getline_lf(buf, stdin) == EOF)
1256                         goto free_specs;
1257                 if (!*buf->buf)
1258                         break;
1259         } while (1);
1260
1261         ret = push(nr_spec, specs);
1262         printf("\n");
1263         fflush(stdout);
1264
1265         if (ret)
1266                 exit(128); /* error already reported */
1267
1268  free_specs:
1269         for (i = 0; i < nr_spec; i++)
1270                 free(specs[i]);
1271         free(specs);
1272 }
1273
1274 static int stateless_connect(const char *service_name)
1275 {
1276         struct discovery *discover;
1277         struct rpc_state rpc;
1278         struct strbuf buf = STRBUF_INIT;
1279
1280         /*
1281          * Run the info/refs request and see if the server supports protocol
1282          * v2.  If and only if the server supports v2 can we successfully
1283          * establish a stateless connection, otherwise we need to tell the
1284          * client to fallback to using other transport helper functions to
1285          * complete their request.
1286          */
1287         discover = discover_refs(service_name, 0);
1288         if (discover->version != protocol_v2) {
1289                 printf("fallback\n");
1290                 fflush(stdout);
1291                 return -1;
1292         } else {
1293                 /* Stateless Connection established */
1294                 printf("\n");
1295                 fflush(stdout);
1296         }
1297
1298         rpc.service_name = service_name;
1299         rpc.service_url = xstrfmt("%s%s", url.buf, rpc.service_name);
1300         rpc.hdr_content_type = xstrfmt("Content-Type: application/x-%s-request", rpc.service_name);
1301         rpc.hdr_accept = xstrfmt("Accept: application/x-%s-result", rpc.service_name);
1302         if (get_protocol_http_header(discover->version, &buf)) {
1303                 rpc.protocol_header = strbuf_detach(&buf, NULL);
1304         } else {
1305                 rpc.protocol_header = NULL;
1306                 strbuf_release(&buf);
1307         }
1308         rpc.buf = xmalloc(http_post_buffer);
1309         rpc.alloc = http_post_buffer;
1310         rpc.len = 0;
1311         rpc.pos = 0;
1312         rpc.in = 1;
1313         rpc.out = 0;
1314         rpc.any_written = 0;
1315         rpc.gzip_request = 1;
1316         rpc.initial_buffer = 0;
1317         rpc.write_line_lengths = 1;
1318         rpc.flush_read_but_not_sent = 0;
1319
1320         /*
1321          * Dump the capability listing that we got from the server earlier
1322          * during the info/refs request.
1323          */
1324         write_or_die(rpc.in, discover->buf, discover->len);
1325
1326         /* Until we see EOF keep sending POSTs */
1327         while (1) {
1328                 size_t avail;
1329                 enum packet_read_status status;
1330
1331                 if (!rpc_read_from_out(&rpc, PACKET_READ_GENTLE_ON_EOF, &avail,
1332                                        &status))
1333                         BUG("The entire rpc->buf should be larger than LARGE_PACKET_MAX");
1334                 if (status == PACKET_READ_EOF)
1335                         break;
1336                 if (post_rpc(&rpc, status == PACKET_READ_FLUSH))
1337                         /* We would have an err here */
1338                         break;
1339                 /* Reset the buffer for next request */
1340                 rpc.len = 0;
1341         }
1342
1343         free(rpc.service_url);
1344         free(rpc.hdr_content_type);
1345         free(rpc.hdr_accept);
1346         free(rpc.protocol_header);
1347         free(rpc.buf);
1348         strbuf_release(&buf);
1349
1350         return 0;
1351 }
1352
1353 int cmd_main(int argc, const char **argv)
1354 {
1355         struct strbuf buf = STRBUF_INIT;
1356         int nongit;
1357
1358         setup_git_directory_gently(&nongit);
1359         if (argc < 2) {
1360                 error(_("remote-curl: usage: git remote-curl <remote> [<url>]"));
1361                 return 1;
1362         }
1363
1364         options.verbosity = 1;
1365         options.progress = !!isatty(2);
1366         options.thin = 1;
1367         string_list_init(&options.deepen_not, 1);
1368         string_list_init(&options.push_options, 1);
1369
1370         /*
1371          * Just report "remote-curl" here (folding all the various aliases
1372          * ("git-remote-http", "git-remote-https", and etc.) here since they
1373          * are all just copies of the same actual executable.
1374          */
1375         trace2_cmd_name("remote-curl");
1376
1377         remote = remote_get(argv[1]);
1378
1379         if (argc > 2) {
1380                 end_url_with_slash(&url, argv[2]);
1381         } else {
1382                 end_url_with_slash(&url, remote->url[0]);
1383         }
1384
1385         http_init(remote, url.buf, 0);
1386
1387         do {
1388                 const char *arg;
1389
1390                 if (strbuf_getline_lf(&buf, stdin) == EOF) {
1391                         if (ferror(stdin))
1392                                 error(_("remote-curl: error reading command stream from git"));
1393                         return 1;
1394                 }
1395                 if (buf.len == 0)
1396                         break;
1397                 if (starts_with(buf.buf, "fetch ")) {
1398                         if (nongit)
1399                                 die(_("remote-curl: fetch attempted without a local repo"));
1400                         parse_fetch(&buf);
1401
1402                 } else if (!strcmp(buf.buf, "list") || starts_with(buf.buf, "list ")) {
1403                         int for_push = !!strstr(buf.buf + 4, "for-push");
1404                         output_refs(get_refs(for_push));
1405
1406                 } else if (starts_with(buf.buf, "push ")) {
1407                         parse_push(&buf);
1408
1409                 } else if (skip_prefix(buf.buf, "option ", &arg)) {
1410                         char *value = strchr(arg, ' ');
1411                         int result;
1412
1413                         if (value)
1414                                 *value++ = '\0';
1415                         else
1416                                 value = "true";
1417
1418                         result = set_option(arg, value);
1419                         if (!result)
1420                                 printf("ok\n");
1421                         else if (result < 0)
1422                                 printf("error invalid value\n");
1423                         else
1424                                 printf("unsupported\n");
1425                         fflush(stdout);
1426
1427                 } else if (!strcmp(buf.buf, "capabilities")) {
1428                         printf("stateless-connect\n");
1429                         printf("fetch\n");
1430                         printf("option\n");
1431                         printf("push\n");
1432                         printf("check-connectivity\n");
1433                         printf("\n");
1434                         fflush(stdout);
1435                 } else if (skip_prefix(buf.buf, "stateless-connect ", &arg)) {
1436                         if (!stateless_connect(arg))
1437                                 break;
1438                 } else {
1439                         error(_("remote-curl: unknown command '%s' from git"), buf.buf);
1440                         return 1;
1441                 }
1442                 strbuf_reset(&buf);
1443         } while (1);
1444
1445         http_cleanup();
1446
1447         return 0;
1448 }