Merge branch 'sg/core-filemode-doc-typofix'
[git] / remote-curl.c
1 #include "cache.h"
2 #include "remote.h"
3 #include "strbuf.h"
4 #include "walker.h"
5 #include "http.h"
6 #include "exec_cmd.h"
7 #include "run-command.h"
8 #include "pkt-line.h"
9 #include "string-list.h"
10 #include "sideband.h"
11 #include "argv-array.h"
12 #include "credential.h"
13 #include "sha1-array.h"
14 #include "send-pack.h"
15
16 static struct remote *remote;
17 /* always ends with a trailing slash */
18 static struct strbuf url = STRBUF_INIT;
19
20 struct options {
21         int verbosity;
22         unsigned long depth;
23         char *deepen_since;
24         struct string_list deepen_not;
25         struct string_list push_options;
26         unsigned progress : 1,
27                 check_self_contained_and_connected : 1,
28                 cloning : 1,
29                 update_shallow : 1,
30                 followtags : 1,
31                 dry_run : 1,
32                 thin : 1,
33                 /* One of the SEND_PACK_PUSH_CERT_* constants. */
34                 push_cert : 2,
35                 deepen_relative : 1;
36 };
37 static struct options options;
38 static struct string_list cas_options = STRING_LIST_INIT_DUP;
39
40 static int set_option(const char *name, const char *value)
41 {
42         if (!strcmp(name, "verbosity")) {
43                 char *end;
44                 int v = strtol(value, &end, 10);
45                 if (value == end || *end)
46                         return -1;
47                 options.verbosity = v;
48                 return 0;
49         }
50         else if (!strcmp(name, "progress")) {
51                 if (!strcmp(value, "true"))
52                         options.progress = 1;
53                 else if (!strcmp(value, "false"))
54                         options.progress = 0;
55                 else
56                         return -1;
57                 return 0;
58         }
59         else if (!strcmp(name, "depth")) {
60                 char *end;
61                 unsigned long v = strtoul(value, &end, 10);
62                 if (value == end || *end)
63                         return -1;
64                 options.depth = v;
65                 return 0;
66         }
67         else if (!strcmp(name, "deepen-since")) {
68                 options.deepen_since = xstrdup(value);
69                 return 0;
70         }
71         else if (!strcmp(name, "deepen-not")) {
72                 string_list_append(&options.deepen_not, value);
73                 return 0;
74         }
75         else if (!strcmp(name, "deepen-relative")) {
76                 if (!strcmp(value, "true"))
77                         options.deepen_relative = 1;
78                 else if (!strcmp(value, "false"))
79                         options.deepen_relative = 0;
80                 else
81                         return -1;
82                 return 0;
83         }
84         else if (!strcmp(name, "followtags")) {
85                 if (!strcmp(value, "true"))
86                         options.followtags = 1;
87                 else if (!strcmp(value, "false"))
88                         options.followtags = 0;
89                 else
90                         return -1;
91                 return 0;
92         }
93         else if (!strcmp(name, "dry-run")) {
94                 if (!strcmp(value, "true"))
95                         options.dry_run = 1;
96                 else if (!strcmp(value, "false"))
97                         options.dry_run = 0;
98                 else
99                         return -1;
100                 return 0;
101         }
102         else if (!strcmp(name, "check-connectivity")) {
103                 if (!strcmp(value, "true"))
104                         options.check_self_contained_and_connected = 1;
105                 else if (!strcmp(value, "false"))
106                         options.check_self_contained_and_connected = 0;
107                 else
108                         return -1;
109                 return 0;
110         }
111         else if (!strcmp(name, "cas")) {
112                 struct strbuf val = STRBUF_INIT;
113                 strbuf_addf(&val, "--" CAS_OPT_NAME "=%s", value);
114                 string_list_append(&cas_options, val.buf);
115                 strbuf_release(&val);
116                 return 0;
117         } else if (!strcmp(name, "cloning")) {
118                 if (!strcmp(value, "true"))
119                         options.cloning = 1;
120                 else if (!strcmp(value, "false"))
121                         options.cloning = 0;
122                 else
123                         return -1;
124                 return 0;
125         } else if (!strcmp(name, "update-shallow")) {
126                 if (!strcmp(value, "true"))
127                         options.update_shallow = 1;
128                 else if (!strcmp(value, "false"))
129                         options.update_shallow = 0;
130                 else
131                         return -1;
132                 return 0;
133         } else if (!strcmp(name, "pushcert")) {
134                 if (!strcmp(value, "true"))
135                         options.push_cert = SEND_PACK_PUSH_CERT_ALWAYS;
136                 else if (!strcmp(value, "false"))
137                         options.push_cert = SEND_PACK_PUSH_CERT_NEVER;
138                 else if (!strcmp(value, "if-asked"))
139                         options.push_cert = SEND_PACK_PUSH_CERT_IF_ASKED;
140                 else
141                         return -1;
142                 return 0;
143         } else if (!strcmp(name, "push-option")) {
144                 string_list_append(&options.push_options, value);
145                 return 0;
146
147 #if LIBCURL_VERSION_NUM >= 0x070a08
148         } else if (!strcmp(name, "family")) {
149                 if (!strcmp(value, "ipv4"))
150                         git_curl_ipresolve = CURL_IPRESOLVE_V4;
151                 else if (!strcmp(value, "ipv6"))
152                         git_curl_ipresolve = CURL_IPRESOLVE_V6;
153                 else if (!strcmp(value, "all"))
154                         git_curl_ipresolve = CURL_IPRESOLVE_WHATEVER;
155                 else
156                         return -1;
157                 return 0;
158 #endif /* LIBCURL_VERSION_NUM >= 0x070a08 */
159         } else {
160                 return 1 /* unsupported */;
161         }
162 }
163
164 struct discovery {
165         const char *service;
166         char *buf_alloc;
167         char *buf;
168         size_t len;
169         struct ref *refs;
170         struct oid_array shallow;
171         unsigned proto_git : 1;
172 };
173 static struct discovery *last_discovery;
174
175 static struct ref *parse_git_refs(struct discovery *heads, int for_push)
176 {
177         struct ref *list = NULL;
178         get_remote_heads(-1, heads->buf, heads->len, &list,
179                          for_push ? REF_NORMAL : 0, NULL, &heads->shallow);
180         return list;
181 }
182
183 static struct ref *parse_info_refs(struct discovery *heads)
184 {
185         char *data, *start, *mid;
186         char *ref_name;
187         int i = 0;
188
189         struct ref *refs = NULL;
190         struct ref *ref = NULL;
191         struct ref *last_ref = NULL;
192
193         data = heads->buf;
194         start = NULL;
195         mid = data;
196         while (i < heads->len) {
197                 if (!start) {
198                         start = &data[i];
199                 }
200                 if (data[i] == '\t')
201                         mid = &data[i];
202                 if (data[i] == '\n') {
203                         if (mid - start != 40)
204                                 die("%sinfo/refs not valid: is this a git repository?",
205                                     url.buf);
206                         data[i] = 0;
207                         ref_name = mid + 1;
208                         ref = alloc_ref(ref_name);
209                         get_oid_hex(start, &ref->old_oid);
210                         if (!refs)
211                                 refs = ref;
212                         if (last_ref)
213                                 last_ref->next = ref;
214                         last_ref = ref;
215                         start = NULL;
216                 }
217                 i++;
218         }
219
220         ref = alloc_ref("HEAD");
221         if (!http_fetch_ref(url.buf, ref) &&
222             !resolve_remote_symref(ref, refs)) {
223                 ref->next = refs;
224                 refs = ref;
225         } else {
226                 free(ref);
227         }
228
229         return refs;
230 }
231
232 static void free_discovery(struct discovery *d)
233 {
234         if (d) {
235                 if (d == last_discovery)
236                         last_discovery = NULL;
237                 free(d->shallow.oid);
238                 free(d->buf_alloc);
239                 free_refs(d->refs);
240                 free(d);
241         }
242 }
243
244 static int show_http_message(struct strbuf *type, struct strbuf *charset,
245                              struct strbuf *msg)
246 {
247         const char *p, *eol;
248
249         /*
250          * We only show text/plain parts, as other types are likely
251          * to be ugly to look at on the user's terminal.
252          */
253         if (strcmp(type->buf, "text/plain"))
254                 return -1;
255         if (charset->len)
256                 strbuf_reencode(msg, charset->buf, get_log_output_encoding());
257
258         strbuf_trim(msg);
259         if (!msg->len)
260                 return -1;
261
262         p = msg->buf;
263         do {
264                 eol = strchrnul(p, '\n');
265                 fprintf(stderr, "remote: %.*s\n", (int)(eol - p), p);
266                 p = eol + 1;
267         } while(*eol);
268         return 0;
269 }
270
271 static struct discovery *discover_refs(const char *service, int for_push)
272 {
273         struct strbuf exp = STRBUF_INIT;
274         struct strbuf type = STRBUF_INIT;
275         struct strbuf charset = STRBUF_INIT;
276         struct strbuf buffer = STRBUF_INIT;
277         struct strbuf refs_url = STRBUF_INIT;
278         struct strbuf effective_url = STRBUF_INIT;
279         struct discovery *last = last_discovery;
280         int http_ret, maybe_smart = 0;
281         struct http_get_options http_options;
282
283         if (last && !strcmp(service, last->service))
284                 return last;
285         free_discovery(last);
286
287         strbuf_addf(&refs_url, "%sinfo/refs", url.buf);
288         if ((starts_with(url.buf, "http://") || starts_with(url.buf, "https://")) &&
289              git_env_bool("GIT_SMART_HTTP", 1)) {
290                 maybe_smart = 1;
291                 if (!strchr(url.buf, '?'))
292                         strbuf_addch(&refs_url, '?');
293                 else
294                         strbuf_addch(&refs_url, '&');
295                 strbuf_addf(&refs_url, "service=%s", service);
296         }
297
298         memset(&http_options, 0, sizeof(http_options));
299         http_options.content_type = &type;
300         http_options.charset = &charset;
301         http_options.effective_url = &effective_url;
302         http_options.base_url = &url;
303         http_options.initial_request = 1;
304         http_options.no_cache = 1;
305         http_options.keep_error = 1;
306
307         http_ret = http_get_strbuf(refs_url.buf, &buffer, &http_options);
308         switch (http_ret) {
309         case HTTP_OK:
310                 break;
311         case HTTP_MISSING_TARGET:
312                 show_http_message(&type, &charset, &buffer);
313                 die("repository '%s' not found", url.buf);
314         case HTTP_NOAUTH:
315                 show_http_message(&type, &charset, &buffer);
316                 die("Authentication failed for '%s'", url.buf);
317         default:
318                 show_http_message(&type, &charset, &buffer);
319                 die("unable to access '%s': %s", url.buf, curl_errorstr);
320         }
321
322         if (options.verbosity && !starts_with(refs_url.buf, url.buf))
323                 warning(_("redirecting to %s"), url.buf);
324
325         last= xcalloc(1, sizeof(*last_discovery));
326         last->service = service;
327         last->buf_alloc = strbuf_detach(&buffer, &last->len);
328         last->buf = last->buf_alloc;
329
330         strbuf_addf(&exp, "application/x-%s-advertisement", service);
331         if (maybe_smart &&
332             (5 <= last->len && last->buf[4] == '#') &&
333             !strbuf_cmp(&exp, &type)) {
334                 char *line;
335
336                 /*
337                  * smart HTTP response; validate that the service
338                  * pkt-line matches our request.
339                  */
340                 line = packet_read_line_buf(&last->buf, &last->len, NULL);
341
342                 strbuf_reset(&exp);
343                 strbuf_addf(&exp, "# service=%s", service);
344                 if (strcmp(line, exp.buf))
345                         die("invalid server response; got '%s'", line);
346                 strbuf_release(&exp);
347
348                 /* The header can include additional metadata lines, up
349                  * until a packet flush marker.  Ignore these now, but
350                  * in the future we might start to scan them.
351                  */
352                 while (packet_read_line_buf(&last->buf, &last->len, NULL))
353                         ;
354
355                 last->proto_git = 1;
356         }
357
358         if (last->proto_git)
359                 last->refs = parse_git_refs(last, for_push);
360         else
361                 last->refs = parse_info_refs(last);
362
363         strbuf_release(&refs_url);
364         strbuf_release(&exp);
365         strbuf_release(&type);
366         strbuf_release(&charset);
367         strbuf_release(&effective_url);
368         strbuf_release(&buffer);
369         last_discovery = last;
370         return last;
371 }
372
373 static struct ref *get_refs(int for_push)
374 {
375         struct discovery *heads;
376
377         if (for_push)
378                 heads = discover_refs("git-receive-pack", for_push);
379         else
380                 heads = discover_refs("git-upload-pack", for_push);
381
382         return heads->refs;
383 }
384
385 static void output_refs(struct ref *refs)
386 {
387         struct ref *posn;
388         for (posn = refs; posn; posn = posn->next) {
389                 if (posn->symref)
390                         printf("@%s %s\n", posn->symref, posn->name);
391                 else
392                         printf("%s %s\n", oid_to_hex(&posn->old_oid), posn->name);
393         }
394         printf("\n");
395         fflush(stdout);
396 }
397
398 struct rpc_state {
399         const char *service_name;
400         const char **argv;
401         struct strbuf *stdin_preamble;
402         char *service_url;
403         char *hdr_content_type;
404         char *hdr_accept;
405         char *buf;
406         size_t alloc;
407         size_t len;
408         size_t pos;
409         int in;
410         int out;
411         int any_written;
412         struct strbuf result;
413         unsigned gzip_request : 1;
414         unsigned initial_buffer : 1;
415 };
416
417 static size_t rpc_out(void *ptr, size_t eltsize,
418                 size_t nmemb, void *buffer_)
419 {
420         size_t max = eltsize * nmemb;
421         struct rpc_state *rpc = buffer_;
422         size_t avail = rpc->len - rpc->pos;
423
424         if (!avail) {
425                 rpc->initial_buffer = 0;
426                 avail = packet_read(rpc->out, NULL, NULL, rpc->buf, rpc->alloc, 0);
427                 if (!avail)
428                         return 0;
429                 rpc->pos = 0;
430                 rpc->len = avail;
431         }
432
433         if (max < avail)
434                 avail = max;
435         memcpy(ptr, rpc->buf + rpc->pos, avail);
436         rpc->pos += avail;
437         return avail;
438 }
439
440 #ifndef NO_CURL_IOCTL
441 static curlioerr rpc_ioctl(CURL *handle, int cmd, void *clientp)
442 {
443         struct rpc_state *rpc = clientp;
444
445         switch (cmd) {
446         case CURLIOCMD_NOP:
447                 return CURLIOE_OK;
448
449         case CURLIOCMD_RESTARTREAD:
450                 if (rpc->initial_buffer) {
451                         rpc->pos = 0;
452                         return CURLIOE_OK;
453                 }
454                 error("unable to rewind rpc post data - try increasing http.postBuffer");
455                 return CURLIOE_FAILRESTART;
456
457         default:
458                 return CURLIOE_UNKNOWNCMD;
459         }
460 }
461 #endif
462
463 static size_t rpc_in(char *ptr, size_t eltsize,
464                 size_t nmemb, void *buffer_)
465 {
466         size_t size = eltsize * nmemb;
467         struct rpc_state *rpc = buffer_;
468         if (size)
469                 rpc->any_written = 1;
470         write_or_die(rpc->in, ptr, size);
471         return size;
472 }
473
474 static int run_slot(struct active_request_slot *slot,
475                     struct slot_results *results)
476 {
477         int err;
478         struct slot_results results_buf;
479
480         if (!results)
481                 results = &results_buf;
482
483         err = run_one_slot(slot, results);
484
485         if (err != HTTP_OK && err != HTTP_REAUTH) {
486                 struct strbuf msg = STRBUF_INIT;
487                 if (results->http_code && results->http_code != 200)
488                         strbuf_addf(&msg, "HTTP %ld", results->http_code);
489                 if (results->curl_result != CURLE_OK) {
490                         if (msg.len)
491                                 strbuf_addch(&msg, ' ');
492                         strbuf_addf(&msg, "curl %d", results->curl_result);
493                         if (curl_errorstr[0]) {
494                                 strbuf_addch(&msg, ' ');
495                                 strbuf_addstr(&msg, curl_errorstr);
496                         }
497                 }
498                 error("RPC failed; %s", msg.buf);
499                 strbuf_release(&msg);
500         }
501
502         return err;
503 }
504
505 static int probe_rpc(struct rpc_state *rpc, struct slot_results *results)
506 {
507         struct active_request_slot *slot;
508         struct curl_slist *headers = http_copy_default_headers();
509         struct strbuf buf = STRBUF_INIT;
510         int err;
511
512         slot = get_active_slot();
513
514         headers = curl_slist_append(headers, rpc->hdr_content_type);
515         headers = curl_slist_append(headers, rpc->hdr_accept);
516
517         curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
518         curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
519         curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
520         curl_easy_setopt(slot->curl, CURLOPT_ENCODING, NULL);
521         curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, "0000");
522         curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, 4);
523         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
524         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
525         curl_easy_setopt(slot->curl, CURLOPT_FILE, &buf);
526
527         err = run_slot(slot, results);
528
529         curl_slist_free_all(headers);
530         strbuf_release(&buf);
531         return err;
532 }
533
534 static curl_off_t xcurl_off_t(ssize_t len) {
535         if (len > maximum_signed_value_of_type(curl_off_t))
536                 die("cannot handle pushes this big");
537         return (curl_off_t) len;
538 }
539
540 static int post_rpc(struct rpc_state *rpc)
541 {
542         struct active_request_slot *slot;
543         struct curl_slist *headers = http_copy_default_headers();
544         int use_gzip = rpc->gzip_request;
545         char *gzip_body = NULL;
546         size_t gzip_size = 0;
547         int err, large_request = 0;
548         int needs_100_continue = 0;
549
550         /* Try to load the entire request, if we can fit it into the
551          * allocated buffer space we can use HTTP/1.0 and avoid the
552          * chunked encoding mess.
553          */
554         while (1) {
555                 size_t left = rpc->alloc - rpc->len;
556                 char *buf = rpc->buf + rpc->len;
557                 int n;
558
559                 if (left < LARGE_PACKET_MAX) {
560                         large_request = 1;
561                         use_gzip = 0;
562                         break;
563                 }
564
565                 n = packet_read(rpc->out, NULL, NULL, buf, left, 0);
566                 if (!n)
567                         break;
568                 rpc->len += n;
569         }
570
571         if (large_request) {
572                 struct slot_results results;
573
574                 do {
575                         err = probe_rpc(rpc, &results);
576                         if (err == HTTP_REAUTH)
577                                 credential_fill(&http_auth);
578                 } while (err == HTTP_REAUTH);
579                 if (err != HTTP_OK)
580                         return -1;
581
582                 if (results.auth_avail & CURLAUTH_GSSNEGOTIATE)
583                         needs_100_continue = 1;
584         }
585
586         headers = curl_slist_append(headers, rpc->hdr_content_type);
587         headers = curl_slist_append(headers, rpc->hdr_accept);
588         headers = curl_slist_append(headers, needs_100_continue ?
589                 "Expect: 100-continue" : "Expect:");
590
591 retry:
592         slot = get_active_slot();
593
594         curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
595         curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
596         curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
597         curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "gzip");
598
599         if (large_request) {
600                 /* The request body is large and the size cannot be predicted.
601                  * We must use chunked encoding to send it.
602                  */
603                 headers = curl_slist_append(headers, "Transfer-Encoding: chunked");
604                 rpc->initial_buffer = 1;
605                 curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, rpc_out);
606                 curl_easy_setopt(slot->curl, CURLOPT_INFILE, rpc);
607 #ifndef NO_CURL_IOCTL
608                 curl_easy_setopt(slot->curl, CURLOPT_IOCTLFUNCTION, rpc_ioctl);
609                 curl_easy_setopt(slot->curl, CURLOPT_IOCTLDATA, rpc);
610 #endif
611                 if (options.verbosity > 1) {
612                         fprintf(stderr, "POST %s (chunked)\n", rpc->service_name);
613                         fflush(stderr);
614                 }
615
616         } else if (gzip_body) {
617                 /*
618                  * If we are looping to retry authentication, then the previous
619                  * run will have set up the headers and gzip buffer already,
620                  * and we just need to send it.
621                  */
622                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);
623                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE_LARGE, xcurl_off_t(gzip_size));
624
625         } else if (use_gzip && 1024 < rpc->len) {
626                 /* The client backend isn't giving us compressed data so
627                  * we can try to deflate it ourselves, this may save on.
628                  * the transfer time.
629                  */
630                 git_zstream stream;
631                 int ret;
632
633                 git_deflate_init_gzip(&stream, Z_BEST_COMPRESSION);
634                 gzip_size = git_deflate_bound(&stream, rpc->len);
635                 gzip_body = xmalloc(gzip_size);
636
637                 stream.next_in = (unsigned char *)rpc->buf;
638                 stream.avail_in = rpc->len;
639                 stream.next_out = (unsigned char *)gzip_body;
640                 stream.avail_out = gzip_size;
641
642                 ret = git_deflate(&stream, Z_FINISH);
643                 if (ret != Z_STREAM_END)
644                         die("cannot deflate request; zlib deflate error %d", ret);
645
646                 ret = git_deflate_end_gently(&stream);
647                 if (ret != Z_OK)
648                         die("cannot deflate request; zlib end error %d", ret);
649
650                 gzip_size = stream.total_out;
651
652                 headers = curl_slist_append(headers, "Content-Encoding: gzip");
653                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);
654                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE_LARGE, xcurl_off_t(gzip_size));
655
656                 if (options.verbosity > 1) {
657                         fprintf(stderr, "POST %s (gzip %lu to %lu bytes)\n",
658                                 rpc->service_name,
659                                 (unsigned long)rpc->len, (unsigned long)gzip_size);
660                         fflush(stderr);
661                 }
662         } else {
663                 /* We know the complete request size in advance, use the
664                  * more normal Content-Length approach.
665                  */
666                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, rpc->buf);
667                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE_LARGE, xcurl_off_t(rpc->len));
668                 if (options.verbosity > 1) {
669                         fprintf(stderr, "POST %s (%lu bytes)\n",
670                                 rpc->service_name, (unsigned long)rpc->len);
671                         fflush(stderr);
672                 }
673         }
674
675         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
676         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, rpc_in);
677         curl_easy_setopt(slot->curl, CURLOPT_FILE, rpc);
678
679
680         rpc->any_written = 0;
681         err = run_slot(slot, NULL);
682         if (err == HTTP_REAUTH && !large_request) {
683                 credential_fill(&http_auth);
684                 goto retry;
685         }
686         if (err != HTTP_OK)
687                 err = -1;
688
689         if (!rpc->any_written)
690                 err = -1;
691
692         curl_slist_free_all(headers);
693         free(gzip_body);
694         return err;
695 }
696
697 static int rpc_service(struct rpc_state *rpc, struct discovery *heads)
698 {
699         const char *svc = rpc->service_name;
700         struct strbuf buf = STRBUF_INIT;
701         struct strbuf *preamble = rpc->stdin_preamble;
702         struct child_process client = CHILD_PROCESS_INIT;
703         int err = 0;
704
705         client.in = -1;
706         client.out = -1;
707         client.git_cmd = 1;
708         client.argv = rpc->argv;
709         if (start_command(&client))
710                 exit(1);
711         if (preamble)
712                 write_or_die(client.in, preamble->buf, preamble->len);
713         if (heads)
714                 write_or_die(client.in, heads->buf, heads->len);
715
716         rpc->alloc = http_post_buffer;
717         rpc->buf = xmalloc(rpc->alloc);
718         rpc->in = client.in;
719         rpc->out = client.out;
720         strbuf_init(&rpc->result, 0);
721
722         strbuf_addf(&buf, "%s%s", url.buf, svc);
723         rpc->service_url = strbuf_detach(&buf, NULL);
724
725         strbuf_addf(&buf, "Content-Type: application/x-%s-request", svc);
726         rpc->hdr_content_type = strbuf_detach(&buf, NULL);
727
728         strbuf_addf(&buf, "Accept: application/x-%s-result", svc);
729         rpc->hdr_accept = strbuf_detach(&buf, NULL);
730
731         while (!err) {
732                 int n = packet_read(rpc->out, NULL, NULL, rpc->buf, rpc->alloc, 0);
733                 if (!n)
734                         break;
735                 rpc->pos = 0;
736                 rpc->len = n;
737                 err |= post_rpc(rpc);
738         }
739
740         close(client.in);
741         client.in = -1;
742         if (!err) {
743                 strbuf_read(&rpc->result, client.out, 0);
744         } else {
745                 char buf[4096];
746                 for (;;)
747                         if (xread(client.out, buf, sizeof(buf)) <= 0)
748                                 break;
749         }
750
751         close(client.out);
752         client.out = -1;
753
754         err |= finish_command(&client);
755         free(rpc->service_url);
756         free(rpc->hdr_content_type);
757         free(rpc->hdr_accept);
758         free(rpc->buf);
759         strbuf_release(&buf);
760         return err;
761 }
762
763 static int fetch_dumb(int nr_heads, struct ref **to_fetch)
764 {
765         struct walker *walker;
766         char **targets;
767         int ret, i;
768
769         ALLOC_ARRAY(targets, nr_heads);
770         if (options.depth || options.deepen_since)
771                 die("dumb http transport does not support shallow capabilities");
772         for (i = 0; i < nr_heads; i++)
773                 targets[i] = xstrdup(oid_to_hex(&to_fetch[i]->old_oid));
774
775         walker = get_http_walker(url.buf);
776         walker->get_all = 1;
777         walker->get_tree = 1;
778         walker->get_history = 1;
779         walker->get_verbosely = options.verbosity >= 3;
780         walker->get_recover = 0;
781         ret = walker_fetch(walker, nr_heads, targets, NULL, NULL);
782         walker_free(walker);
783
784         for (i = 0; i < nr_heads; i++)
785                 free(targets[i]);
786         free(targets);
787
788         return ret ? error("fetch failed.") : 0;
789 }
790
791 static int fetch_git(struct discovery *heads,
792         int nr_heads, struct ref **to_fetch)
793 {
794         struct rpc_state rpc;
795         struct strbuf preamble = STRBUF_INIT;
796         int i, err;
797         struct argv_array args = ARGV_ARRAY_INIT;
798
799         argv_array_pushl(&args, "fetch-pack", "--stateless-rpc",
800                          "--stdin", "--lock-pack", NULL);
801         if (options.followtags)
802                 argv_array_push(&args, "--include-tag");
803         if (options.thin)
804                 argv_array_push(&args, "--thin");
805         if (options.verbosity >= 3)
806                 argv_array_pushl(&args, "-v", "-v", NULL);
807         if (options.check_self_contained_and_connected)
808                 argv_array_push(&args, "--check-self-contained-and-connected");
809         if (options.cloning)
810                 argv_array_push(&args, "--cloning");
811         if (options.update_shallow)
812                 argv_array_push(&args, "--update-shallow");
813         if (!options.progress)
814                 argv_array_push(&args, "--no-progress");
815         if (options.depth)
816                 argv_array_pushf(&args, "--depth=%lu", options.depth);
817         if (options.deepen_since)
818                 argv_array_pushf(&args, "--shallow-since=%s", options.deepen_since);
819         for (i = 0; i < options.deepen_not.nr; i++)
820                 argv_array_pushf(&args, "--shallow-exclude=%s",
821                                  options.deepen_not.items[i].string);
822         if (options.deepen_relative && options.depth)
823                 argv_array_push(&args, "--deepen-relative");
824         argv_array_push(&args, url.buf);
825
826         for (i = 0; i < nr_heads; i++) {
827                 struct ref *ref = to_fetch[i];
828                 if (!*ref->name)
829                         die("cannot fetch by sha1 over smart http");
830                 packet_buf_write(&preamble, "%s %s\n",
831                                  oid_to_hex(&ref->old_oid), ref->name);
832         }
833         packet_buf_flush(&preamble);
834
835         memset(&rpc, 0, sizeof(rpc));
836         rpc.service_name = "git-upload-pack",
837         rpc.argv = args.argv;
838         rpc.stdin_preamble = &preamble;
839         rpc.gzip_request = 1;
840
841         err = rpc_service(&rpc, heads);
842         if (rpc.result.len)
843                 write_or_die(1, rpc.result.buf, rpc.result.len);
844         strbuf_release(&rpc.result);
845         strbuf_release(&preamble);
846         argv_array_clear(&args);
847         return err;
848 }
849
850 static int fetch(int nr_heads, struct ref **to_fetch)
851 {
852         struct discovery *d = discover_refs("git-upload-pack", 0);
853         if (d->proto_git)
854                 return fetch_git(d, nr_heads, to_fetch);
855         else
856                 return fetch_dumb(nr_heads, to_fetch);
857 }
858
859 static void parse_fetch(struct strbuf *buf)
860 {
861         struct ref **to_fetch = NULL;
862         struct ref *list_head = NULL;
863         struct ref **list = &list_head;
864         int alloc_heads = 0, nr_heads = 0;
865
866         do {
867                 const char *p;
868                 if (skip_prefix(buf->buf, "fetch ", &p)) {
869                         const char *name;
870                         struct ref *ref;
871                         struct object_id old_oid;
872
873                         if (get_oid_hex(p, &old_oid))
874                                 die("protocol error: expected sha/ref, got %s'", p);
875                         if (p[GIT_SHA1_HEXSZ] == ' ')
876                                 name = p + GIT_SHA1_HEXSZ + 1;
877                         else if (!p[GIT_SHA1_HEXSZ])
878                                 name = "";
879                         else
880                                 die("protocol error: expected sha/ref, got %s'", p);
881
882                         ref = alloc_ref(name);
883                         oidcpy(&ref->old_oid, &old_oid);
884
885                         *list = ref;
886                         list = &ref->next;
887
888                         ALLOC_GROW(to_fetch, nr_heads + 1, alloc_heads);
889                         to_fetch[nr_heads++] = ref;
890                 }
891                 else
892                         die("http transport does not support %s", buf->buf);
893
894                 strbuf_reset(buf);
895                 if (strbuf_getline_lf(buf, stdin) == EOF)
896                         return;
897                 if (!*buf->buf)
898                         break;
899         } while (1);
900
901         if (fetch(nr_heads, to_fetch))
902                 exit(128); /* error already reported */
903         free_refs(list_head);
904         free(to_fetch);
905
906         printf("\n");
907         fflush(stdout);
908         strbuf_reset(buf);
909 }
910
911 static int push_dav(int nr_spec, char **specs)
912 {
913         struct child_process child = CHILD_PROCESS_INIT;
914         size_t i;
915
916         child.git_cmd = 1;
917         argv_array_push(&child.args, "http-push");
918         argv_array_push(&child.args, "--helper-status");
919         if (options.dry_run)
920                 argv_array_push(&child.args, "--dry-run");
921         if (options.verbosity > 1)
922                 argv_array_push(&child.args, "--verbose");
923         argv_array_push(&child.args, url.buf);
924         for (i = 0; i < nr_spec; i++)
925                 argv_array_push(&child.args, specs[i]);
926
927         if (run_command(&child))
928                 die("git-http-push failed");
929         return 0;
930 }
931
932 static int push_git(struct discovery *heads, int nr_spec, char **specs)
933 {
934         struct rpc_state rpc;
935         int i, err;
936         struct argv_array args;
937         struct string_list_item *cas_option;
938         struct strbuf preamble = STRBUF_INIT;
939
940         argv_array_init(&args);
941         argv_array_pushl(&args, "send-pack", "--stateless-rpc", "--helper-status",
942                          NULL);
943
944         if (options.thin)
945                 argv_array_push(&args, "--thin");
946         if (options.dry_run)
947                 argv_array_push(&args, "--dry-run");
948         if (options.push_cert == SEND_PACK_PUSH_CERT_ALWAYS)
949                 argv_array_push(&args, "--signed=yes");
950         else if (options.push_cert == SEND_PACK_PUSH_CERT_IF_ASKED)
951                 argv_array_push(&args, "--signed=if-asked");
952         if (options.verbosity == 0)
953                 argv_array_push(&args, "--quiet");
954         else if (options.verbosity > 1)
955                 argv_array_push(&args, "--verbose");
956         for (i = 0; i < options.push_options.nr; i++)
957                 argv_array_pushf(&args, "--push-option=%s",
958                                  options.push_options.items[i].string);
959         argv_array_push(&args, options.progress ? "--progress" : "--no-progress");
960         for_each_string_list_item(cas_option, &cas_options)
961                 argv_array_push(&args, cas_option->string);
962         argv_array_push(&args, url.buf);
963
964         argv_array_push(&args, "--stdin");
965         for (i = 0; i < nr_spec; i++)
966                 packet_buf_write(&preamble, "%s\n", specs[i]);
967         packet_buf_flush(&preamble);
968
969         memset(&rpc, 0, sizeof(rpc));
970         rpc.service_name = "git-receive-pack",
971         rpc.argv = args.argv;
972         rpc.stdin_preamble = &preamble;
973
974         err = rpc_service(&rpc, heads);
975         if (rpc.result.len)
976                 write_or_die(1, rpc.result.buf, rpc.result.len);
977         strbuf_release(&rpc.result);
978         strbuf_release(&preamble);
979         argv_array_clear(&args);
980         return err;
981 }
982
983 static int push(int nr_spec, char **specs)
984 {
985         struct discovery *heads = discover_refs("git-receive-pack", 1);
986         int ret;
987
988         if (heads->proto_git)
989                 ret = push_git(heads, nr_spec, specs);
990         else
991                 ret = push_dav(nr_spec, specs);
992         free_discovery(heads);
993         return ret;
994 }
995
996 static void parse_push(struct strbuf *buf)
997 {
998         char **specs = NULL;
999         int alloc_spec = 0, nr_spec = 0, i, ret;
1000
1001         do {
1002                 if (starts_with(buf->buf, "push ")) {
1003                         ALLOC_GROW(specs, nr_spec + 1, alloc_spec);
1004                         specs[nr_spec++] = xstrdup(buf->buf + 5);
1005                 }
1006                 else
1007                         die("http transport does not support %s", buf->buf);
1008
1009                 strbuf_reset(buf);
1010                 if (strbuf_getline_lf(buf, stdin) == EOF)
1011                         goto free_specs;
1012                 if (!*buf->buf)
1013                         break;
1014         } while (1);
1015
1016         ret = push(nr_spec, specs);
1017         printf("\n");
1018         fflush(stdout);
1019
1020         if (ret)
1021                 exit(128); /* error already reported */
1022
1023  free_specs:
1024         for (i = 0; i < nr_spec; i++)
1025                 free(specs[i]);
1026         free(specs);
1027 }
1028
1029 int cmd_main(int argc, const char **argv)
1030 {
1031         struct strbuf buf = STRBUF_INIT;
1032         int nongit;
1033
1034         setup_git_directory_gently(&nongit);
1035         if (argc < 2) {
1036                 error("remote-curl: usage: git remote-curl <remote> [<url>]");
1037                 return 1;
1038         }
1039
1040         options.verbosity = 1;
1041         options.progress = !!isatty(2);
1042         options.thin = 1;
1043         string_list_init(&options.deepen_not, 1);
1044         string_list_init(&options.push_options, 1);
1045
1046         remote = remote_get(argv[1]);
1047
1048         if (argc > 2) {
1049                 end_url_with_slash(&url, argv[2]);
1050         } else {
1051                 end_url_with_slash(&url, remote->url[0]);
1052         }
1053
1054         http_init(remote, url.buf, 0);
1055
1056         do {
1057                 const char *arg;
1058
1059                 if (strbuf_getline_lf(&buf, stdin) == EOF) {
1060                         if (ferror(stdin))
1061                                 error("remote-curl: error reading command stream from git");
1062                         return 1;
1063                 }
1064                 if (buf.len == 0)
1065                         break;
1066                 if (starts_with(buf.buf, "fetch ")) {
1067                         if (nongit)
1068                                 die("remote-curl: fetch attempted without a local repo");
1069                         parse_fetch(&buf);
1070
1071                 } else if (!strcmp(buf.buf, "list") || starts_with(buf.buf, "list ")) {
1072                         int for_push = !!strstr(buf.buf + 4, "for-push");
1073                         output_refs(get_refs(for_push));
1074
1075                 } else if (starts_with(buf.buf, "push ")) {
1076                         parse_push(&buf);
1077
1078                 } else if (skip_prefix(buf.buf, "option ", &arg)) {
1079                         char *value = strchr(arg, ' ');
1080                         int result;
1081
1082                         if (value)
1083                                 *value++ = '\0';
1084                         else
1085                                 value = "true";
1086
1087                         result = set_option(arg, value);
1088                         if (!result)
1089                                 printf("ok\n");
1090                         else if (result < 0)
1091                                 printf("error invalid value\n");
1092                         else
1093                                 printf("unsupported\n");
1094                         fflush(stdout);
1095
1096                 } else if (!strcmp(buf.buf, "capabilities")) {
1097                         printf("fetch\n");
1098                         printf("option\n");
1099                         printf("push\n");
1100                         printf("check-connectivity\n");
1101                         printf("\n");
1102                         fflush(stdout);
1103                 } else {
1104                         error("remote-curl: unknown command '%s' from git", buf.buf);
1105                         return 1;
1106                 }
1107                 strbuf_reset(&buf);
1108         } while (1);
1109
1110         http_cleanup();
1111
1112         return 0;
1113 }