Merge remote-tracking branch 'sv/nafmo/master'
[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
15 static struct remote *remote;
16 /* always ends with a trailing slash */
17 static struct strbuf url = STRBUF_INIT;
18
19 struct options {
20         int verbosity;
21         unsigned long depth;
22         unsigned progress : 1,
23                 check_self_contained_and_connected : 1,
24                 cloning : 1,
25                 update_shallow : 1,
26                 followtags : 1,
27                 dry_run : 1,
28                 thin : 1;
29 };
30 static struct options options;
31 static struct string_list cas_options = STRING_LIST_INIT_DUP;
32
33 static int set_option(const char *name, const char *value)
34 {
35         if (!strcmp(name, "verbosity")) {
36                 char *end;
37                 int v = strtol(value, &end, 10);
38                 if (value == end || *end)
39                         return -1;
40                 options.verbosity = v;
41                 return 0;
42         }
43         else if (!strcmp(name, "progress")) {
44                 if (!strcmp(value, "true"))
45                         options.progress = 1;
46                 else if (!strcmp(value, "false"))
47                         options.progress = 0;
48                 else
49                         return -1;
50                 return 0;
51         }
52         else if (!strcmp(name, "depth")) {
53                 char *end;
54                 unsigned long v = strtoul(value, &end, 10);
55                 if (value == end || *end)
56                         return -1;
57                 options.depth = v;
58                 return 0;
59         }
60         else if (!strcmp(name, "followtags")) {
61                 if (!strcmp(value, "true"))
62                         options.followtags = 1;
63                 else if (!strcmp(value, "false"))
64                         options.followtags = 0;
65                 else
66                         return -1;
67                 return 0;
68         }
69         else if (!strcmp(name, "dry-run")) {
70                 if (!strcmp(value, "true"))
71                         options.dry_run = 1;
72                 else if (!strcmp(value, "false"))
73                         options.dry_run = 0;
74                 else
75                         return -1;
76                 return 0;
77         }
78         else if (!strcmp(name, "check-connectivity")) {
79                 if (!strcmp(value, "true"))
80                         options.check_self_contained_and_connected = 1;
81                 else if (!strcmp(value, "false"))
82                         options.check_self_contained_and_connected = 0;
83                 else
84                         return -1;
85                 return 0;
86         }
87         else if (!strcmp(name, "cas")) {
88                 struct strbuf val = STRBUF_INIT;
89                 strbuf_addf(&val, "--" CAS_OPT_NAME "=%s", value);
90                 string_list_append(&cas_options, val.buf);
91                 strbuf_release(&val);
92                 return 0;
93         } else if (!strcmp(name, "cloning")) {
94                 if (!strcmp(value, "true"))
95                         options.cloning = 1;
96                 else if (!strcmp(value, "false"))
97                         options.cloning = 0;
98                 else
99                         return -1;
100                 return 0;
101         } else if (!strcmp(name, "update-shallow")) {
102                 if (!strcmp(value, "true"))
103                         options.update_shallow = 1;
104                 else if (!strcmp(value, "false"))
105                         options.update_shallow = 0;
106                 else
107                         return -1;
108                 return 0;
109         } else {
110                 return 1 /* unsupported */;
111         }
112 }
113
114 struct discovery {
115         const char *service;
116         char *buf_alloc;
117         char *buf;
118         size_t len;
119         struct ref *refs;
120         struct sha1_array shallow;
121         unsigned proto_git : 1;
122 };
123 static struct discovery *last_discovery;
124
125 static struct ref *parse_git_refs(struct discovery *heads, int for_push)
126 {
127         struct ref *list = NULL;
128         get_remote_heads(-1, heads->buf, heads->len, &list,
129                          for_push ? REF_NORMAL : 0, NULL, &heads->shallow);
130         return list;
131 }
132
133 static struct ref *parse_info_refs(struct discovery *heads)
134 {
135         char *data, *start, *mid;
136         char *ref_name;
137         int i = 0;
138
139         struct ref *refs = NULL;
140         struct ref *ref = NULL;
141         struct ref *last_ref = NULL;
142
143         data = heads->buf;
144         start = NULL;
145         mid = data;
146         while (i < heads->len) {
147                 if (!start) {
148                         start = &data[i];
149                 }
150                 if (data[i] == '\t')
151                         mid = &data[i];
152                 if (data[i] == '\n') {
153                         if (mid - start != 40)
154                                 die("%sinfo/refs not valid: is this a git repository?",
155                                     url.buf);
156                         data[i] = 0;
157                         ref_name = mid + 1;
158                         ref = xmalloc(sizeof(struct ref) +
159                                       strlen(ref_name) + 1);
160                         memset(ref, 0, sizeof(struct ref));
161                         strcpy(ref->name, ref_name);
162                         get_sha1_hex(start, ref->old_sha1);
163                         if (!refs)
164                                 refs = ref;
165                         if (last_ref)
166                                 last_ref->next = ref;
167                         last_ref = ref;
168                         start = NULL;
169                 }
170                 i++;
171         }
172
173         ref = alloc_ref("HEAD");
174         if (!http_fetch_ref(url.buf, ref) &&
175             !resolve_remote_symref(ref, refs)) {
176                 ref->next = refs;
177                 refs = ref;
178         } else {
179                 free(ref);
180         }
181
182         return refs;
183 }
184
185 static void free_discovery(struct discovery *d)
186 {
187         if (d) {
188                 if (d == last_discovery)
189                         last_discovery = NULL;
190                 free(d->shallow.sha1);
191                 free(d->buf_alloc);
192                 free_refs(d->refs);
193                 free(d);
194         }
195 }
196
197 static int show_http_message(struct strbuf *type, struct strbuf *charset,
198                              struct strbuf *msg)
199 {
200         const char *p, *eol;
201
202         /*
203          * We only show text/plain parts, as other types are likely
204          * to be ugly to look at on the user's terminal.
205          */
206         if (strcmp(type->buf, "text/plain"))
207                 return -1;
208         if (charset->len)
209                 strbuf_reencode(msg, charset->buf, get_log_output_encoding());
210
211         strbuf_trim(msg);
212         if (!msg->len)
213                 return -1;
214
215         p = msg->buf;
216         do {
217                 eol = strchrnul(p, '\n');
218                 fprintf(stderr, "remote: %.*s\n", (int)(eol - p), p);
219                 p = eol + 1;
220         } while(*eol);
221         return 0;
222 }
223
224 static struct discovery* discover_refs(const char *service, int for_push)
225 {
226         struct strbuf exp = STRBUF_INIT;
227         struct strbuf type = STRBUF_INIT;
228         struct strbuf charset = STRBUF_INIT;
229         struct strbuf buffer = STRBUF_INIT;
230         struct strbuf refs_url = STRBUF_INIT;
231         struct strbuf effective_url = STRBUF_INIT;
232         struct discovery *last = last_discovery;
233         int http_ret, maybe_smart = 0;
234         struct http_get_options options;
235
236         if (last && !strcmp(service, last->service))
237                 return last;
238         free_discovery(last);
239
240         strbuf_addf(&refs_url, "%sinfo/refs", url.buf);
241         if ((starts_with(url.buf, "http://") || starts_with(url.buf, "https://")) &&
242              git_env_bool("GIT_SMART_HTTP", 1)) {
243                 maybe_smart = 1;
244                 if (!strchr(url.buf, '?'))
245                         strbuf_addch(&refs_url, '?');
246                 else
247                         strbuf_addch(&refs_url, '&');
248                 strbuf_addf(&refs_url, "service=%s", service);
249         }
250
251         memset(&options, 0, sizeof(options));
252         options.content_type = &type;
253         options.charset = &charset;
254         options.effective_url = &effective_url;
255         options.base_url = &url;
256         options.no_cache = 1;
257         options.keep_error = 1;
258
259         http_ret = http_get_strbuf(refs_url.buf, &buffer, &options);
260         switch (http_ret) {
261         case HTTP_OK:
262                 break;
263         case HTTP_MISSING_TARGET:
264                 show_http_message(&type, &charset, &buffer);
265                 die("repository '%s' not found", url.buf);
266         case HTTP_NOAUTH:
267                 show_http_message(&type, &charset, &buffer);
268                 die("Authentication failed for '%s'", url.buf);
269         default:
270                 show_http_message(&type, &charset, &buffer);
271                 die("unable to access '%s': %s", url.buf, curl_errorstr);
272         }
273
274         last= xcalloc(1, sizeof(*last_discovery));
275         last->service = service;
276         last->buf_alloc = strbuf_detach(&buffer, &last->len);
277         last->buf = last->buf_alloc;
278
279         strbuf_addf(&exp, "application/x-%s-advertisement", service);
280         if (maybe_smart &&
281             (5 <= last->len && last->buf[4] == '#') &&
282             !strbuf_cmp(&exp, &type)) {
283                 char *line;
284
285                 /*
286                  * smart HTTP response; validate that the service
287                  * pkt-line matches our request.
288                  */
289                 line = packet_read_line_buf(&last->buf, &last->len, NULL);
290
291                 strbuf_reset(&exp);
292                 strbuf_addf(&exp, "# service=%s", service);
293                 if (strcmp(line, exp.buf))
294                         die("invalid server response; got '%s'", line);
295                 strbuf_release(&exp);
296
297                 /* The header can include additional metadata lines, up
298                  * until a packet flush marker.  Ignore these now, but
299                  * in the future we might start to scan them.
300                  */
301                 while (packet_read_line_buf(&last->buf, &last->len, NULL))
302                         ;
303
304                 last->proto_git = 1;
305         }
306
307         if (last->proto_git)
308                 last->refs = parse_git_refs(last, for_push);
309         else
310                 last->refs = parse_info_refs(last);
311
312         strbuf_release(&refs_url);
313         strbuf_release(&exp);
314         strbuf_release(&type);
315         strbuf_release(&charset);
316         strbuf_release(&effective_url);
317         strbuf_release(&buffer);
318         last_discovery = last;
319         return last;
320 }
321
322 static struct ref *get_refs(int for_push)
323 {
324         struct discovery *heads;
325
326         if (for_push)
327                 heads = discover_refs("git-receive-pack", for_push);
328         else
329                 heads = discover_refs("git-upload-pack", for_push);
330
331         return heads->refs;
332 }
333
334 static void output_refs(struct ref *refs)
335 {
336         struct ref *posn;
337         for (posn = refs; posn; posn = posn->next) {
338                 if (posn->symref)
339                         printf("@%s %s\n", posn->symref, posn->name);
340                 else
341                         printf("%s %s\n", sha1_to_hex(posn->old_sha1), posn->name);
342         }
343         printf("\n");
344         fflush(stdout);
345 }
346
347 struct rpc_state {
348         const char *service_name;
349         const char **argv;
350         struct strbuf *stdin_preamble;
351         char *service_url;
352         char *hdr_content_type;
353         char *hdr_accept;
354         char *buf;
355         size_t alloc;
356         size_t len;
357         size_t pos;
358         int in;
359         int out;
360         struct strbuf result;
361         unsigned gzip_request : 1;
362         unsigned initial_buffer : 1;
363 };
364
365 static size_t rpc_out(void *ptr, size_t eltsize,
366                 size_t nmemb, void *buffer_)
367 {
368         size_t max = eltsize * nmemb;
369         struct rpc_state *rpc = buffer_;
370         size_t avail = rpc->len - rpc->pos;
371
372         if (!avail) {
373                 rpc->initial_buffer = 0;
374                 avail = packet_read(rpc->out, NULL, NULL, rpc->buf, rpc->alloc, 0);
375                 if (!avail)
376                         return 0;
377                 rpc->pos = 0;
378                 rpc->len = avail;
379         }
380
381         if (max < avail)
382                 avail = max;
383         memcpy(ptr, rpc->buf + rpc->pos, avail);
384         rpc->pos += avail;
385         return avail;
386 }
387
388 #ifndef NO_CURL_IOCTL
389 static curlioerr rpc_ioctl(CURL *handle, int cmd, void *clientp)
390 {
391         struct rpc_state *rpc = clientp;
392
393         switch (cmd) {
394         case CURLIOCMD_NOP:
395                 return CURLIOE_OK;
396
397         case CURLIOCMD_RESTARTREAD:
398                 if (rpc->initial_buffer) {
399                         rpc->pos = 0;
400                         return CURLIOE_OK;
401                 }
402                 error("unable to rewind rpc post data - try increasing http.postBuffer");
403                 return CURLIOE_FAILRESTART;
404
405         default:
406                 return CURLIOE_UNKNOWNCMD;
407         }
408 }
409 #endif
410
411 static size_t rpc_in(char *ptr, size_t eltsize,
412                 size_t nmemb, void *buffer_)
413 {
414         size_t size = eltsize * nmemb;
415         struct rpc_state *rpc = buffer_;
416         write_or_die(rpc->in, ptr, size);
417         return size;
418 }
419
420 static int run_slot(struct active_request_slot *slot,
421                     struct slot_results *results)
422 {
423         int err;
424         struct slot_results results_buf;
425
426         if (!results)
427                 results = &results_buf;
428
429         err = run_one_slot(slot, results);
430
431         if (err != HTTP_OK && err != HTTP_REAUTH) {
432                 error("RPC failed; result=%d, HTTP code = %ld",
433                       results->curl_result, results->http_code);
434         }
435
436         return err;
437 }
438
439 static int probe_rpc(struct rpc_state *rpc, struct slot_results *results)
440 {
441         struct active_request_slot *slot;
442         struct curl_slist *headers = NULL;
443         struct strbuf buf = STRBUF_INIT;
444         int err;
445
446         slot = get_active_slot();
447
448         headers = curl_slist_append(headers, rpc->hdr_content_type);
449         headers = curl_slist_append(headers, rpc->hdr_accept);
450
451         curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
452         curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
453         curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
454         curl_easy_setopt(slot->curl, CURLOPT_ENCODING, NULL);
455         curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, "0000");
456         curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, 4);
457         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
458         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
459         curl_easy_setopt(slot->curl, CURLOPT_FILE, &buf);
460
461         err = run_slot(slot, results);
462
463         curl_slist_free_all(headers);
464         strbuf_release(&buf);
465         return err;
466 }
467
468 static int post_rpc(struct rpc_state *rpc)
469 {
470         struct active_request_slot *slot;
471         struct curl_slist *headers = NULL;
472         int use_gzip = rpc->gzip_request;
473         char *gzip_body = NULL;
474         size_t gzip_size = 0;
475         int err, large_request = 0;
476         int needs_100_continue = 0;
477
478         /* Try to load the entire request, if we can fit it into the
479          * allocated buffer space we can use HTTP/1.0 and avoid the
480          * chunked encoding mess.
481          */
482         while (1) {
483                 size_t left = rpc->alloc - rpc->len;
484                 char *buf = rpc->buf + rpc->len;
485                 int n;
486
487                 if (left < LARGE_PACKET_MAX) {
488                         large_request = 1;
489                         use_gzip = 0;
490                         break;
491                 }
492
493                 n = packet_read(rpc->out, NULL, NULL, buf, left, 0);
494                 if (!n)
495                         break;
496                 rpc->len += n;
497         }
498
499         if (large_request) {
500                 struct slot_results results;
501
502                 do {
503                         err = probe_rpc(rpc, &results);
504                         if (err == HTTP_REAUTH)
505                                 credential_fill(&http_auth);
506                 } while (err == HTTP_REAUTH);
507                 if (err != HTTP_OK)
508                         return -1;
509
510                 if (results.auth_avail & CURLAUTH_GSSNEGOTIATE)
511                         needs_100_continue = 1;
512         }
513
514         headers = curl_slist_append(headers, rpc->hdr_content_type);
515         headers = curl_slist_append(headers, rpc->hdr_accept);
516         headers = curl_slist_append(headers, needs_100_continue ?
517                 "Expect: 100-continue" : "Expect:");
518
519 retry:
520         slot = get_active_slot();
521
522         curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
523         curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
524         curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
525         curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "gzip");
526
527         if (large_request) {
528                 /* The request body is large and the size cannot be predicted.
529                  * We must use chunked encoding to send it.
530                  */
531                 headers = curl_slist_append(headers, "Transfer-Encoding: chunked");
532                 rpc->initial_buffer = 1;
533                 curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, rpc_out);
534                 curl_easy_setopt(slot->curl, CURLOPT_INFILE, rpc);
535 #ifndef NO_CURL_IOCTL
536                 curl_easy_setopt(slot->curl, CURLOPT_IOCTLFUNCTION, rpc_ioctl);
537                 curl_easy_setopt(slot->curl, CURLOPT_IOCTLDATA, rpc);
538 #endif
539                 if (options.verbosity > 1) {
540                         fprintf(stderr, "POST %s (chunked)\n", rpc->service_name);
541                         fflush(stderr);
542                 }
543
544         } else if (gzip_body) {
545                 /*
546                  * If we are looping to retry authentication, then the previous
547                  * run will have set up the headers and gzip buffer already,
548                  * and we just need to send it.
549                  */
550                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);
551                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, gzip_size);
552
553         } else if (use_gzip && 1024 < rpc->len) {
554                 /* The client backend isn't giving us compressed data so
555                  * we can try to deflate it ourselves, this may save on.
556                  * the transfer time.
557                  */
558                 git_zstream stream;
559                 int ret;
560
561                 memset(&stream, 0, sizeof(stream));
562                 git_deflate_init_gzip(&stream, Z_BEST_COMPRESSION);
563                 gzip_size = git_deflate_bound(&stream, rpc->len);
564                 gzip_body = xmalloc(gzip_size);
565
566                 stream.next_in = (unsigned char *)rpc->buf;
567                 stream.avail_in = rpc->len;
568                 stream.next_out = (unsigned char *)gzip_body;
569                 stream.avail_out = gzip_size;
570
571                 ret = git_deflate(&stream, Z_FINISH);
572                 if (ret != Z_STREAM_END)
573                         die("cannot deflate request; zlib deflate error %d", ret);
574
575                 ret = git_deflate_end_gently(&stream);
576                 if (ret != Z_OK)
577                         die("cannot deflate request; zlib end error %d", ret);
578
579                 gzip_size = stream.total_out;
580
581                 headers = curl_slist_append(headers, "Content-Encoding: gzip");
582                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);
583                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, gzip_size);
584
585                 if (options.verbosity > 1) {
586                         fprintf(stderr, "POST %s (gzip %lu to %lu bytes)\n",
587                                 rpc->service_name,
588                                 (unsigned long)rpc->len, (unsigned long)gzip_size);
589                         fflush(stderr);
590                 }
591         } else {
592                 /* We know the complete request size in advance, use the
593                  * more normal Content-Length approach.
594                  */
595                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, rpc->buf);
596                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, rpc->len);
597                 if (options.verbosity > 1) {
598                         fprintf(stderr, "POST %s (%lu bytes)\n",
599                                 rpc->service_name, (unsigned long)rpc->len);
600                         fflush(stderr);
601                 }
602         }
603
604         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
605         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, rpc_in);
606         curl_easy_setopt(slot->curl, CURLOPT_FILE, rpc);
607
608         err = run_slot(slot, NULL);
609         if (err == HTTP_REAUTH && !large_request) {
610                 credential_fill(&http_auth);
611                 goto retry;
612         }
613         if (err != HTTP_OK)
614                 err = -1;
615
616         curl_slist_free_all(headers);
617         free(gzip_body);
618         return err;
619 }
620
621 static int rpc_service(struct rpc_state *rpc, struct discovery *heads)
622 {
623         const char *svc = rpc->service_name;
624         struct strbuf buf = STRBUF_INIT;
625         struct strbuf *preamble = rpc->stdin_preamble;
626         struct child_process client;
627         int err = 0;
628
629         memset(&client, 0, sizeof(client));
630         client.in = -1;
631         client.out = -1;
632         client.git_cmd = 1;
633         client.argv = rpc->argv;
634         if (start_command(&client))
635                 exit(1);
636         if (preamble)
637                 write_or_die(client.in, preamble->buf, preamble->len);
638         if (heads)
639                 write_or_die(client.in, heads->buf, heads->len);
640
641         rpc->alloc = http_post_buffer;
642         rpc->buf = xmalloc(rpc->alloc);
643         rpc->in = client.in;
644         rpc->out = client.out;
645         strbuf_init(&rpc->result, 0);
646
647         strbuf_addf(&buf, "%s%s", url.buf, svc);
648         rpc->service_url = strbuf_detach(&buf, NULL);
649
650         strbuf_addf(&buf, "Content-Type: application/x-%s-request", svc);
651         rpc->hdr_content_type = strbuf_detach(&buf, NULL);
652
653         strbuf_addf(&buf, "Accept: application/x-%s-result", svc);
654         rpc->hdr_accept = strbuf_detach(&buf, NULL);
655
656         while (!err) {
657                 int n = packet_read(rpc->out, NULL, NULL, rpc->buf, rpc->alloc, 0);
658                 if (!n)
659                         break;
660                 rpc->pos = 0;
661                 rpc->len = n;
662                 err |= post_rpc(rpc);
663         }
664
665         close(client.in);
666         client.in = -1;
667         if (!err) {
668                 strbuf_read(&rpc->result, client.out, 0);
669         } else {
670                 char buf[4096];
671                 for (;;)
672                         if (xread(client.out, buf, sizeof(buf)) <= 0)
673                                 break;
674         }
675
676         close(client.out);
677         client.out = -1;
678
679         err |= finish_command(&client);
680         free(rpc->service_url);
681         free(rpc->hdr_content_type);
682         free(rpc->hdr_accept);
683         free(rpc->buf);
684         strbuf_release(&buf);
685         return err;
686 }
687
688 static int fetch_dumb(int nr_heads, struct ref **to_fetch)
689 {
690         struct walker *walker;
691         char **targets = xmalloc(nr_heads * sizeof(char*));
692         int ret, i;
693
694         if (options.depth)
695                 die("dumb http transport does not support --depth");
696         for (i = 0; i < nr_heads; i++)
697                 targets[i] = xstrdup(sha1_to_hex(to_fetch[i]->old_sha1));
698
699         walker = get_http_walker(url.buf);
700         walker->get_all = 1;
701         walker->get_tree = 1;
702         walker->get_history = 1;
703         walker->get_verbosely = options.verbosity >= 3;
704         walker->get_recover = 0;
705         ret = walker_fetch(walker, nr_heads, targets, NULL, NULL);
706         walker_free(walker);
707
708         for (i = 0; i < nr_heads; i++)
709                 free(targets[i]);
710         free(targets);
711
712         return ret ? error("fetch failed.") : 0;
713 }
714
715 static int fetch_git(struct discovery *heads,
716         int nr_heads, struct ref **to_fetch)
717 {
718         struct rpc_state rpc;
719         struct strbuf preamble = STRBUF_INIT;
720         char *depth_arg = NULL;
721         int argc = 0, i, err;
722         const char *argv[17];
723
724         argv[argc++] = "fetch-pack";
725         argv[argc++] = "--stateless-rpc";
726         argv[argc++] = "--stdin";
727         argv[argc++] = "--lock-pack";
728         if (options.followtags)
729                 argv[argc++] = "--include-tag";
730         if (options.thin)
731                 argv[argc++] = "--thin";
732         if (options.verbosity >= 3) {
733                 argv[argc++] = "-v";
734                 argv[argc++] = "-v";
735         }
736         if (options.check_self_contained_and_connected)
737                 argv[argc++] = "--check-self-contained-and-connected";
738         if (options.cloning)
739                 argv[argc++] = "--cloning";
740         if (options.update_shallow)
741                 argv[argc++] = "--update-shallow";
742         if (!options.progress)
743                 argv[argc++] = "--no-progress";
744         if (options.depth) {
745                 struct strbuf buf = STRBUF_INIT;
746                 strbuf_addf(&buf, "--depth=%lu", options.depth);
747                 depth_arg = strbuf_detach(&buf, NULL);
748                 argv[argc++] = depth_arg;
749         }
750         argv[argc++] = url.buf;
751         argv[argc++] = NULL;
752
753         for (i = 0; i < nr_heads; i++) {
754                 struct ref *ref = to_fetch[i];
755                 if (!ref->name || !*ref->name)
756                         die("cannot fetch by sha1 over smart http");
757                 packet_buf_write(&preamble, "%s %s\n",
758                                  sha1_to_hex(ref->old_sha1), ref->name);
759         }
760         packet_buf_flush(&preamble);
761
762         memset(&rpc, 0, sizeof(rpc));
763         rpc.service_name = "git-upload-pack",
764         rpc.argv = argv;
765         rpc.stdin_preamble = &preamble;
766         rpc.gzip_request = 1;
767
768         err = rpc_service(&rpc, heads);
769         if (rpc.result.len)
770                 write_or_die(1, rpc.result.buf, rpc.result.len);
771         strbuf_release(&rpc.result);
772         strbuf_release(&preamble);
773         free(depth_arg);
774         return err;
775 }
776
777 static int fetch(int nr_heads, struct ref **to_fetch)
778 {
779         struct discovery *d = discover_refs("git-upload-pack", 0);
780         if (d->proto_git)
781                 return fetch_git(d, nr_heads, to_fetch);
782         else
783                 return fetch_dumb(nr_heads, to_fetch);
784 }
785
786 static void parse_fetch(struct strbuf *buf)
787 {
788         struct ref **to_fetch = NULL;
789         struct ref *list_head = NULL;
790         struct ref **list = &list_head;
791         int alloc_heads = 0, nr_heads = 0;
792
793         do {
794                 const char *p;
795                 if (skip_prefix(buf->buf, "fetch ", &p)) {
796                         const char *name;
797                         struct ref *ref;
798                         unsigned char old_sha1[20];
799
800                         if (strlen(p) < 40 || get_sha1_hex(p, old_sha1))
801                                 die("protocol error: expected sha/ref, got %s'", p);
802                         if (p[40] == ' ')
803                                 name = p + 41;
804                         else if (!p[40])
805                                 name = "";
806                         else
807                                 die("protocol error: expected sha/ref, got %s'", p);
808
809                         ref = alloc_ref(name);
810                         hashcpy(ref->old_sha1, old_sha1);
811
812                         *list = ref;
813                         list = &ref->next;
814
815                         ALLOC_GROW(to_fetch, nr_heads + 1, alloc_heads);
816                         to_fetch[nr_heads++] = ref;
817                 }
818                 else
819                         die("http transport does not support %s", buf->buf);
820
821                 strbuf_reset(buf);
822                 if (strbuf_getline(buf, stdin, '\n') == EOF)
823                         return;
824                 if (!*buf->buf)
825                         break;
826         } while (1);
827
828         if (fetch(nr_heads, to_fetch))
829                 exit(128); /* error already reported */
830         free_refs(list_head);
831         free(to_fetch);
832
833         printf("\n");
834         fflush(stdout);
835         strbuf_reset(buf);
836 }
837
838 static int push_dav(int nr_spec, char **specs)
839 {
840         const char **argv = xmalloc((10 + nr_spec) * sizeof(char*));
841         int argc = 0, i;
842
843         argv[argc++] = "http-push";
844         argv[argc++] = "--helper-status";
845         if (options.dry_run)
846                 argv[argc++] = "--dry-run";
847         if (options.verbosity > 1)
848                 argv[argc++] = "--verbose";
849         argv[argc++] = url.buf;
850         for (i = 0; i < nr_spec; i++)
851                 argv[argc++] = specs[i];
852         argv[argc++] = NULL;
853
854         if (run_command_v_opt(argv, RUN_GIT_CMD))
855                 die("git-%s failed", argv[0]);
856         free(argv);
857         return 0;
858 }
859
860 static int push_git(struct discovery *heads, int nr_spec, char **specs)
861 {
862         struct rpc_state rpc;
863         int i, err;
864         struct argv_array args;
865         struct string_list_item *cas_option;
866
867         argv_array_init(&args);
868         argv_array_pushl(&args, "send-pack", "--stateless-rpc", "--helper-status",
869                          NULL);
870
871         if (options.thin)
872                 argv_array_push(&args, "--thin");
873         if (options.dry_run)
874                 argv_array_push(&args, "--dry-run");
875         if (options.verbosity == 0)
876                 argv_array_push(&args, "--quiet");
877         else if (options.verbosity > 1)
878                 argv_array_push(&args, "--verbose");
879         argv_array_push(&args, options.progress ? "--progress" : "--no-progress");
880         for_each_string_list_item(cas_option, &cas_options)
881                 argv_array_push(&args, cas_option->string);
882         argv_array_push(&args, url.buf);
883         for (i = 0; i < nr_spec; i++)
884                 argv_array_push(&args, specs[i]);
885
886         memset(&rpc, 0, sizeof(rpc));
887         rpc.service_name = "git-receive-pack",
888         rpc.argv = args.argv;
889
890         err = rpc_service(&rpc, heads);
891         if (rpc.result.len)
892                 write_or_die(1, rpc.result.buf, rpc.result.len);
893         strbuf_release(&rpc.result);
894         argv_array_clear(&args);
895         return err;
896 }
897
898 static int push(int nr_spec, char **specs)
899 {
900         struct discovery *heads = discover_refs("git-receive-pack", 1);
901         int ret;
902
903         if (heads->proto_git)
904                 ret = push_git(heads, nr_spec, specs);
905         else
906                 ret = push_dav(nr_spec, specs);
907         free_discovery(heads);
908         return ret;
909 }
910
911 static void parse_push(struct strbuf *buf)
912 {
913         char **specs = NULL;
914         int alloc_spec = 0, nr_spec = 0, i, ret;
915
916         do {
917                 if (starts_with(buf->buf, "push ")) {
918                         ALLOC_GROW(specs, nr_spec + 1, alloc_spec);
919                         specs[nr_spec++] = xstrdup(buf->buf + 5);
920                 }
921                 else
922                         die("http transport does not support %s", buf->buf);
923
924                 strbuf_reset(buf);
925                 if (strbuf_getline(buf, stdin, '\n') == EOF)
926                         goto free_specs;
927                 if (!*buf->buf)
928                         break;
929         } while (1);
930
931         ret = push(nr_spec, specs);
932         printf("\n");
933         fflush(stdout);
934
935         if (ret)
936                 exit(128); /* error already reported */
937
938  free_specs:
939         for (i = 0; i < nr_spec; i++)
940                 free(specs[i]);
941         free(specs);
942 }
943
944 int main(int argc, const char **argv)
945 {
946         struct strbuf buf = STRBUF_INIT;
947         int nongit;
948
949         git_extract_argv0_path(argv[0]);
950         setup_git_directory_gently(&nongit);
951         if (argc < 2) {
952                 error("remote-curl: usage: git remote-curl <remote> [<url>]");
953                 return 1;
954         }
955
956         options.verbosity = 1;
957         options.progress = !!isatty(2);
958         options.thin = 1;
959
960         remote = remote_get(argv[1]);
961
962         if (argc > 2) {
963                 end_url_with_slash(&url, argv[2]);
964         } else {
965                 end_url_with_slash(&url, remote->url[0]);
966         }
967
968         http_init(remote, url.buf, 0);
969
970         do {
971                 const char *arg;
972
973                 if (strbuf_getline(&buf, stdin, '\n') == EOF) {
974                         if (ferror(stdin))
975                                 error("remote-curl: error reading command stream from git");
976                         return 1;
977                 }
978                 if (buf.len == 0)
979                         break;
980                 if (starts_with(buf.buf, "fetch ")) {
981                         if (nongit)
982                                 die("remote-curl: fetch attempted without a local repo");
983                         parse_fetch(&buf);
984
985                 } else if (!strcmp(buf.buf, "list") || starts_with(buf.buf, "list ")) {
986                         int for_push = !!strstr(buf.buf + 4, "for-push");
987                         output_refs(get_refs(for_push));
988
989                 } else if (starts_with(buf.buf, "push ")) {
990                         parse_push(&buf);
991
992                 } else if (skip_prefix(buf.buf, "option ", &arg)) {
993                         char *value = strchr(arg, ' ');
994                         int result;
995
996                         if (value)
997                                 *value++ = '\0';
998                         else
999                                 value = "true";
1000
1001                         result = set_option(arg, value);
1002                         if (!result)
1003                                 printf("ok\n");
1004                         else if (result < 0)
1005                                 printf("error invalid value\n");
1006                         else
1007                                 printf("unsupported\n");
1008                         fflush(stdout);
1009
1010                 } else if (!strcmp(buf.buf, "capabilities")) {
1011                         printf("fetch\n");
1012                         printf("option\n");
1013                         printf("push\n");
1014                         printf("check-connectivity\n");
1015                         printf("\n");
1016                         fflush(stdout);
1017                 } else {
1018                         error("remote-curl: unknown command '%s' from git", buf.buf);
1019                         return 1;
1020                 }
1021                 strbuf_reset(&buf);
1022         } while (1);
1023
1024         http_cleanup();
1025
1026         return 0;
1027 }