config: add git_config_get_expiry() from gc.c
[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         unsigned progress : 1,
26                 check_self_contained_and_connected : 1,
27                 cloning : 1,
28                 update_shallow : 1,
29                 followtags : 1,
30                 dry_run : 1,
31                 thin : 1,
32                 /* One of the SEND_PACK_PUSH_CERT_* constants. */
33                 push_cert : 2,
34                 deepen_relative : 1;
35 };
36 static struct options options;
37 static struct string_list cas_options = STRING_LIST_INIT_DUP;
38
39 static int set_option(const char *name, const char *value)
40 {
41         if (!strcmp(name, "verbosity")) {
42                 char *end;
43                 int v = strtol(value, &end, 10);
44                 if (value == end || *end)
45                         return -1;
46                 options.verbosity = v;
47                 return 0;
48         }
49         else if (!strcmp(name, "progress")) {
50                 if (!strcmp(value, "true"))
51                         options.progress = 1;
52                 else if (!strcmp(value, "false"))
53                         options.progress = 0;
54                 else
55                         return -1;
56                 return 0;
57         }
58         else if (!strcmp(name, "depth")) {
59                 char *end;
60                 unsigned long v = strtoul(value, &end, 10);
61                 if (value == end || *end)
62                         return -1;
63                 options.depth = v;
64                 return 0;
65         }
66         else if (!strcmp(name, "deepen-since")) {
67                 options.deepen_since = xstrdup(value);
68                 return 0;
69         }
70         else if (!strcmp(name, "deepen-not")) {
71                 string_list_append(&options.deepen_not, value);
72                 return 0;
73         }
74         else if (!strcmp(name, "deepen-relative")) {
75                 if (!strcmp(value, "true"))
76                         options.deepen_relative = 1;
77                 else if (!strcmp(value, "false"))
78                         options.deepen_relative = 0;
79                 else
80                         return -1;
81                 return 0;
82         }
83         else if (!strcmp(name, "followtags")) {
84                 if (!strcmp(value, "true"))
85                         options.followtags = 1;
86                 else if (!strcmp(value, "false"))
87                         options.followtags = 0;
88                 else
89                         return -1;
90                 return 0;
91         }
92         else if (!strcmp(name, "dry-run")) {
93                 if (!strcmp(value, "true"))
94                         options.dry_run = 1;
95                 else if (!strcmp(value, "false"))
96                         options.dry_run = 0;
97                 else
98                         return -1;
99                 return 0;
100         }
101         else if (!strcmp(name, "check-connectivity")) {
102                 if (!strcmp(value, "true"))
103                         options.check_self_contained_and_connected = 1;
104                 else if (!strcmp(value, "false"))
105                         options.check_self_contained_and_connected = 0;
106                 else
107                         return -1;
108                 return 0;
109         }
110         else if (!strcmp(name, "cas")) {
111                 struct strbuf val = STRBUF_INIT;
112                 strbuf_addf(&val, "--" CAS_OPT_NAME "=%s", value);
113                 string_list_append(&cas_options, val.buf);
114                 strbuf_release(&val);
115                 return 0;
116         } else if (!strcmp(name, "cloning")) {
117                 if (!strcmp(value, "true"))
118                         options.cloning = 1;
119                 else if (!strcmp(value, "false"))
120                         options.cloning = 0;
121                 else
122                         return -1;
123                 return 0;
124         } else if (!strcmp(name, "update-shallow")) {
125                 if (!strcmp(value, "true"))
126                         options.update_shallow = 1;
127                 else if (!strcmp(value, "false"))
128                         options.update_shallow = 0;
129                 else
130                         return -1;
131                 return 0;
132         } else if (!strcmp(name, "pushcert")) {
133                 if (!strcmp(value, "true"))
134                         options.push_cert = SEND_PACK_PUSH_CERT_ALWAYS;
135                 else if (!strcmp(value, "false"))
136                         options.push_cert = SEND_PACK_PUSH_CERT_NEVER;
137                 else if (!strcmp(value, "if-asked"))
138                         options.push_cert = SEND_PACK_PUSH_CERT_IF_ASKED;
139                 else
140                         return -1;
141                 return 0;
142
143 #if LIBCURL_VERSION_NUM >= 0x070a08
144         } else if (!strcmp(name, "family")) {
145                 if (!strcmp(value, "ipv4"))
146                         git_curl_ipresolve = CURL_IPRESOLVE_V4;
147                 else if (!strcmp(value, "ipv6"))
148                         git_curl_ipresolve = CURL_IPRESOLVE_V6;
149                 else if (!strcmp(value, "all"))
150                         git_curl_ipresolve = CURL_IPRESOLVE_WHATEVER;
151                 else
152                         return -1;
153                 return 0;
154 #endif /* LIBCURL_VERSION_NUM >= 0x070a08 */
155         } else {
156                 return 1 /* unsupported */;
157         }
158 }
159
160 struct discovery {
161         const char *service;
162         char *buf_alloc;
163         char *buf;
164         size_t len;
165         struct ref *refs;
166         struct sha1_array shallow;
167         unsigned proto_git : 1;
168 };
169 static struct discovery *last_discovery;
170
171 static struct ref *parse_git_refs(struct discovery *heads, int for_push)
172 {
173         struct ref *list = NULL;
174         get_remote_heads(-1, heads->buf, heads->len, &list,
175                          for_push ? REF_NORMAL : 0, NULL, &heads->shallow);
176         return list;
177 }
178
179 static struct ref *parse_info_refs(struct discovery *heads)
180 {
181         char *data, *start, *mid;
182         char *ref_name;
183         int i = 0;
184
185         struct ref *refs = NULL;
186         struct ref *ref = NULL;
187         struct ref *last_ref = NULL;
188
189         data = heads->buf;
190         start = NULL;
191         mid = data;
192         while (i < heads->len) {
193                 if (!start) {
194                         start = &data[i];
195                 }
196                 if (data[i] == '\t')
197                         mid = &data[i];
198                 if (data[i] == '\n') {
199                         if (mid - start != 40)
200                                 die("%sinfo/refs not valid: is this a git repository?",
201                                     url.buf);
202                         data[i] = 0;
203                         ref_name = mid + 1;
204                         ref = alloc_ref(ref_name);
205                         get_oid_hex(start, &ref->old_oid);
206                         if (!refs)
207                                 refs = ref;
208                         if (last_ref)
209                                 last_ref->next = ref;
210                         last_ref = ref;
211                         start = NULL;
212                 }
213                 i++;
214         }
215
216         ref = alloc_ref("HEAD");
217         if (!http_fetch_ref(url.buf, ref) &&
218             !resolve_remote_symref(ref, refs)) {
219                 ref->next = refs;
220                 refs = ref;
221         } else {
222                 free(ref);
223         }
224
225         return refs;
226 }
227
228 static void free_discovery(struct discovery *d)
229 {
230         if (d) {
231                 if (d == last_discovery)
232                         last_discovery = NULL;
233                 free(d->shallow.sha1);
234                 free(d->buf_alloc);
235                 free_refs(d->refs);
236                 free(d);
237         }
238 }
239
240 static int show_http_message(struct strbuf *type, struct strbuf *charset,
241                              struct strbuf *msg)
242 {
243         const char *p, *eol;
244
245         /*
246          * We only show text/plain parts, as other types are likely
247          * to be ugly to look at on the user's terminal.
248          */
249         if (strcmp(type->buf, "text/plain"))
250                 return -1;
251         if (charset->len)
252                 strbuf_reencode(msg, charset->buf, get_log_output_encoding());
253
254         strbuf_trim(msg);
255         if (!msg->len)
256                 return -1;
257
258         p = msg->buf;
259         do {
260                 eol = strchrnul(p, '\n');
261                 fprintf(stderr, "remote: %.*s\n", (int)(eol - p), p);
262                 p = eol + 1;
263         } while(*eol);
264         return 0;
265 }
266
267 static struct discovery *discover_refs(const char *service, int for_push)
268 {
269         struct strbuf exp = STRBUF_INIT;
270         struct strbuf type = STRBUF_INIT;
271         struct strbuf charset = STRBUF_INIT;
272         struct strbuf buffer = STRBUF_INIT;
273         struct strbuf refs_url = STRBUF_INIT;
274         struct strbuf effective_url = STRBUF_INIT;
275         struct discovery *last = last_discovery;
276         int http_ret, maybe_smart = 0;
277         struct http_get_options http_options;
278
279         if (last && !strcmp(service, last->service))
280                 return last;
281         free_discovery(last);
282
283         strbuf_addf(&refs_url, "%sinfo/refs", url.buf);
284         if ((starts_with(url.buf, "http://") || starts_with(url.buf, "https://")) &&
285              git_env_bool("GIT_SMART_HTTP", 1)) {
286                 maybe_smart = 1;
287                 if (!strchr(url.buf, '?'))
288                         strbuf_addch(&refs_url, '?');
289                 else
290                         strbuf_addch(&refs_url, '&');
291                 strbuf_addf(&refs_url, "service=%s", service);
292         }
293
294         memset(&http_options, 0, sizeof(http_options));
295         http_options.content_type = &type;
296         http_options.charset = &charset;
297         http_options.effective_url = &effective_url;
298         http_options.base_url = &url;
299         http_options.initial_request = 1;
300         http_options.no_cache = 1;
301         http_options.keep_error = 1;
302
303         http_ret = http_get_strbuf(refs_url.buf, &buffer, &http_options);
304         switch (http_ret) {
305         case HTTP_OK:
306                 break;
307         case HTTP_MISSING_TARGET:
308                 show_http_message(&type, &charset, &buffer);
309                 die("repository '%s' not found", url.buf);
310         case HTTP_NOAUTH:
311                 show_http_message(&type, &charset, &buffer);
312                 die("Authentication failed for '%s'", url.buf);
313         default:
314                 show_http_message(&type, &charset, &buffer);
315                 die("unable to access '%s': %s", url.buf, curl_errorstr);
316         }
317
318         if (options.verbosity && !starts_with(refs_url.buf, url.buf))
319                 warning(_("redirecting to %s"), url.buf);
320
321         last= xcalloc(1, sizeof(*last_discovery));
322         last->service = service;
323         last->buf_alloc = strbuf_detach(&buffer, &last->len);
324         last->buf = last->buf_alloc;
325
326         strbuf_addf(&exp, "application/x-%s-advertisement", service);
327         if (maybe_smart &&
328             (5 <= last->len && last->buf[4] == '#') &&
329             !strbuf_cmp(&exp, &type)) {
330                 char *line;
331
332                 /*
333                  * smart HTTP response; validate that the service
334                  * pkt-line matches our request.
335                  */
336                 line = packet_read_line_buf(&last->buf, &last->len, NULL);
337
338                 strbuf_reset(&exp);
339                 strbuf_addf(&exp, "# service=%s", service);
340                 if (strcmp(line, exp.buf))
341                         die("invalid server response; got '%s'", line);
342                 strbuf_release(&exp);
343
344                 /* The header can include additional metadata lines, up
345                  * until a packet flush marker.  Ignore these now, but
346                  * in the future we might start to scan them.
347                  */
348                 while (packet_read_line_buf(&last->buf, &last->len, NULL))
349                         ;
350
351                 last->proto_git = 1;
352         }
353
354         if (last->proto_git)
355                 last->refs = parse_git_refs(last, for_push);
356         else
357                 last->refs = parse_info_refs(last);
358
359         strbuf_release(&refs_url);
360         strbuf_release(&exp);
361         strbuf_release(&type);
362         strbuf_release(&charset);
363         strbuf_release(&effective_url);
364         strbuf_release(&buffer);
365         last_discovery = last;
366         return last;
367 }
368
369 static struct ref *get_refs(int for_push)
370 {
371         struct discovery *heads;
372
373         if (for_push)
374                 heads = discover_refs("git-receive-pack", for_push);
375         else
376                 heads = discover_refs("git-upload-pack", for_push);
377
378         return heads->refs;
379 }
380
381 static void output_refs(struct ref *refs)
382 {
383         struct ref *posn;
384         for (posn = refs; posn; posn = posn->next) {
385                 if (posn->symref)
386                         printf("@%s %s\n", posn->symref, posn->name);
387                 else
388                         printf("%s %s\n", oid_to_hex(&posn->old_oid), posn->name);
389         }
390         printf("\n");
391         fflush(stdout);
392 }
393
394 struct rpc_state {
395         const char *service_name;
396         const char **argv;
397         struct strbuf *stdin_preamble;
398         char *service_url;
399         char *hdr_content_type;
400         char *hdr_accept;
401         char *buf;
402         size_t alloc;
403         size_t len;
404         size_t pos;
405         int in;
406         int out;
407         struct strbuf result;
408         unsigned gzip_request : 1;
409         unsigned initial_buffer : 1;
410 };
411
412 static size_t rpc_out(void *ptr, size_t eltsize,
413                 size_t nmemb, void *buffer_)
414 {
415         size_t max = eltsize * nmemb;
416         struct rpc_state *rpc = buffer_;
417         size_t avail = rpc->len - rpc->pos;
418
419         if (!avail) {
420                 rpc->initial_buffer = 0;
421                 avail = packet_read(rpc->out, NULL, NULL, rpc->buf, rpc->alloc, 0);
422                 if (!avail)
423                         return 0;
424                 rpc->pos = 0;
425                 rpc->len = avail;
426         }
427
428         if (max < avail)
429                 avail = max;
430         memcpy(ptr, rpc->buf + rpc->pos, avail);
431         rpc->pos += avail;
432         return avail;
433 }
434
435 #ifndef NO_CURL_IOCTL
436 static curlioerr rpc_ioctl(CURL *handle, int cmd, void *clientp)
437 {
438         struct rpc_state *rpc = clientp;
439
440         switch (cmd) {
441         case CURLIOCMD_NOP:
442                 return CURLIOE_OK;
443
444         case CURLIOCMD_RESTARTREAD:
445                 if (rpc->initial_buffer) {
446                         rpc->pos = 0;
447                         return CURLIOE_OK;
448                 }
449                 error("unable to rewind rpc post data - try increasing http.postBuffer");
450                 return CURLIOE_FAILRESTART;
451
452         default:
453                 return CURLIOE_UNKNOWNCMD;
454         }
455 }
456 #endif
457
458 static size_t rpc_in(char *ptr, size_t eltsize,
459                 size_t nmemb, void *buffer_)
460 {
461         size_t size = eltsize * nmemb;
462         struct rpc_state *rpc = buffer_;
463         write_or_die(rpc->in, ptr, size);
464         return size;
465 }
466
467 static int run_slot(struct active_request_slot *slot,
468                     struct slot_results *results)
469 {
470         int err;
471         struct slot_results results_buf;
472
473         if (!results)
474                 results = &results_buf;
475
476         err = run_one_slot(slot, results);
477
478         if (err != HTTP_OK && err != HTTP_REAUTH) {
479                 struct strbuf msg = STRBUF_INIT;
480                 if (results->http_code && results->http_code != 200)
481                         strbuf_addf(&msg, "HTTP %ld", results->http_code);
482                 if (results->curl_result != CURLE_OK) {
483                         if (msg.len)
484                                 strbuf_addch(&msg, ' ');
485                         strbuf_addf(&msg, "curl %d", results->curl_result);
486                         if (curl_errorstr[0]) {
487                                 strbuf_addch(&msg, ' ');
488                                 strbuf_addstr(&msg, curl_errorstr);
489                         }
490                 }
491                 error("RPC failed; %s", msg.buf);
492                 strbuf_release(&msg);
493         }
494
495         return err;
496 }
497
498 static int probe_rpc(struct rpc_state *rpc, struct slot_results *results)
499 {
500         struct active_request_slot *slot;
501         struct curl_slist *headers = http_copy_default_headers();
502         struct strbuf buf = STRBUF_INIT;
503         int err;
504
505         slot = get_active_slot();
506
507         headers = curl_slist_append(headers, rpc->hdr_content_type);
508         headers = curl_slist_append(headers, rpc->hdr_accept);
509
510         curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
511         curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
512         curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
513         curl_easy_setopt(slot->curl, CURLOPT_ENCODING, NULL);
514         curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, "0000");
515         curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, 4);
516         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
517         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
518         curl_easy_setopt(slot->curl, CURLOPT_FILE, &buf);
519
520         err = run_slot(slot, results);
521
522         curl_slist_free_all(headers);
523         strbuf_release(&buf);
524         return err;
525 }
526
527 static int post_rpc(struct rpc_state *rpc)
528 {
529         struct active_request_slot *slot;
530         struct curl_slist *headers = http_copy_default_headers();
531         int use_gzip = rpc->gzip_request;
532         char *gzip_body = NULL;
533         size_t gzip_size = 0;
534         int err, large_request = 0;
535         int needs_100_continue = 0;
536
537         /* Try to load the entire request, if we can fit it into the
538          * allocated buffer space we can use HTTP/1.0 and avoid the
539          * chunked encoding mess.
540          */
541         while (1) {
542                 size_t left = rpc->alloc - rpc->len;
543                 char *buf = rpc->buf + rpc->len;
544                 int n;
545
546                 if (left < LARGE_PACKET_MAX) {
547                         large_request = 1;
548                         use_gzip = 0;
549                         break;
550                 }
551
552                 n = packet_read(rpc->out, NULL, NULL, buf, left, 0);
553                 if (!n)
554                         break;
555                 rpc->len += n;
556         }
557
558         if (large_request) {
559                 struct slot_results results;
560
561                 do {
562                         err = probe_rpc(rpc, &results);
563                         if (err == HTTP_REAUTH)
564                                 credential_fill(&http_auth);
565                 } while (err == HTTP_REAUTH);
566                 if (err != HTTP_OK)
567                         return -1;
568
569                 if (results.auth_avail & CURLAUTH_GSSNEGOTIATE)
570                         needs_100_continue = 1;
571         }
572
573         headers = curl_slist_append(headers, rpc->hdr_content_type);
574         headers = curl_slist_append(headers, rpc->hdr_accept);
575         headers = curl_slist_append(headers, needs_100_continue ?
576                 "Expect: 100-continue" : "Expect:");
577
578 retry:
579         slot = get_active_slot();
580
581         curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
582         curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
583         curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
584         curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "gzip");
585
586         if (large_request) {
587                 /* The request body is large and the size cannot be predicted.
588                  * We must use chunked encoding to send it.
589                  */
590                 headers = curl_slist_append(headers, "Transfer-Encoding: chunked");
591                 rpc->initial_buffer = 1;
592                 curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, rpc_out);
593                 curl_easy_setopt(slot->curl, CURLOPT_INFILE, rpc);
594 #ifndef NO_CURL_IOCTL
595                 curl_easy_setopt(slot->curl, CURLOPT_IOCTLFUNCTION, rpc_ioctl);
596                 curl_easy_setopt(slot->curl, CURLOPT_IOCTLDATA, rpc);
597 #endif
598                 if (options.verbosity > 1) {
599                         fprintf(stderr, "POST %s (chunked)\n", rpc->service_name);
600                         fflush(stderr);
601                 }
602
603         } else if (gzip_body) {
604                 /*
605                  * If we are looping to retry authentication, then the previous
606                  * run will have set up the headers and gzip buffer already,
607                  * and we just need to send it.
608                  */
609                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);
610                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, gzip_size);
611
612         } else if (use_gzip && 1024 < rpc->len) {
613                 /* The client backend isn't giving us compressed data so
614                  * we can try to deflate it ourselves, this may save on.
615                  * the transfer time.
616                  */
617                 git_zstream stream;
618                 int ret;
619
620                 git_deflate_init_gzip(&stream, Z_BEST_COMPRESSION);
621                 gzip_size = git_deflate_bound(&stream, rpc->len);
622                 gzip_body = xmalloc(gzip_size);
623
624                 stream.next_in = (unsigned char *)rpc->buf;
625                 stream.avail_in = rpc->len;
626                 stream.next_out = (unsigned char *)gzip_body;
627                 stream.avail_out = gzip_size;
628
629                 ret = git_deflate(&stream, Z_FINISH);
630                 if (ret != Z_STREAM_END)
631                         die("cannot deflate request; zlib deflate error %d", ret);
632
633                 ret = git_deflate_end_gently(&stream);
634                 if (ret != Z_OK)
635                         die("cannot deflate request; zlib end error %d", ret);
636
637                 gzip_size = stream.total_out;
638
639                 headers = curl_slist_append(headers, "Content-Encoding: gzip");
640                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);
641                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, gzip_size);
642
643                 if (options.verbosity > 1) {
644                         fprintf(stderr, "POST %s (gzip %lu to %lu bytes)\n",
645                                 rpc->service_name,
646                                 (unsigned long)rpc->len, (unsigned long)gzip_size);
647                         fflush(stderr);
648                 }
649         } else {
650                 /* We know the complete request size in advance, use the
651                  * more normal Content-Length approach.
652                  */
653                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, rpc->buf);
654                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, rpc->len);
655                 if (options.verbosity > 1) {
656                         fprintf(stderr, "POST %s (%lu bytes)\n",
657                                 rpc->service_name, (unsigned long)rpc->len);
658                         fflush(stderr);
659                 }
660         }
661
662         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
663         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, rpc_in);
664         curl_easy_setopt(slot->curl, CURLOPT_FILE, rpc);
665
666         err = run_slot(slot, NULL);
667         if (err == HTTP_REAUTH && !large_request) {
668                 credential_fill(&http_auth);
669                 goto retry;
670         }
671         if (err != HTTP_OK)
672                 err = -1;
673
674         curl_slist_free_all(headers);
675         free(gzip_body);
676         return err;
677 }
678
679 static int rpc_service(struct rpc_state *rpc, struct discovery *heads)
680 {
681         const char *svc = rpc->service_name;
682         struct strbuf buf = STRBUF_INIT;
683         struct strbuf *preamble = rpc->stdin_preamble;
684         struct child_process client = CHILD_PROCESS_INIT;
685         int err = 0;
686
687         client.in = -1;
688         client.out = -1;
689         client.git_cmd = 1;
690         client.argv = rpc->argv;
691         if (start_command(&client))
692                 exit(1);
693         if (preamble)
694                 write_or_die(client.in, preamble->buf, preamble->len);
695         if (heads)
696                 write_or_die(client.in, heads->buf, heads->len);
697
698         rpc->alloc = http_post_buffer;
699         rpc->buf = xmalloc(rpc->alloc);
700         rpc->in = client.in;
701         rpc->out = client.out;
702         strbuf_init(&rpc->result, 0);
703
704         strbuf_addf(&buf, "%s%s", url.buf, svc);
705         rpc->service_url = strbuf_detach(&buf, NULL);
706
707         strbuf_addf(&buf, "Content-Type: application/x-%s-request", svc);
708         rpc->hdr_content_type = strbuf_detach(&buf, NULL);
709
710         strbuf_addf(&buf, "Accept: application/x-%s-result", svc);
711         rpc->hdr_accept = strbuf_detach(&buf, NULL);
712
713         while (!err) {
714                 int n = packet_read(rpc->out, NULL, NULL, rpc->buf, rpc->alloc, 0);
715                 if (!n)
716                         break;
717                 rpc->pos = 0;
718                 rpc->len = n;
719                 err |= post_rpc(rpc);
720         }
721
722         close(client.in);
723         client.in = -1;
724         if (!err) {
725                 strbuf_read(&rpc->result, client.out, 0);
726         } else {
727                 char buf[4096];
728                 for (;;)
729                         if (xread(client.out, buf, sizeof(buf)) <= 0)
730                                 break;
731         }
732
733         close(client.out);
734         client.out = -1;
735
736         err |= finish_command(&client);
737         free(rpc->service_url);
738         free(rpc->hdr_content_type);
739         free(rpc->hdr_accept);
740         free(rpc->buf);
741         strbuf_release(&buf);
742         return err;
743 }
744
745 static int fetch_dumb(int nr_heads, struct ref **to_fetch)
746 {
747         struct walker *walker;
748         char **targets;
749         int ret, i;
750
751         ALLOC_ARRAY(targets, nr_heads);
752         if (options.depth || options.deepen_since)
753                 die("dumb http transport does not support shallow capabilities");
754         for (i = 0; i < nr_heads; i++)
755                 targets[i] = xstrdup(oid_to_hex(&to_fetch[i]->old_oid));
756
757         walker = get_http_walker(url.buf);
758         walker->get_all = 1;
759         walker->get_tree = 1;
760         walker->get_history = 1;
761         walker->get_verbosely = options.verbosity >= 3;
762         walker->get_recover = 0;
763         ret = walker_fetch(walker, nr_heads, targets, NULL, NULL);
764         walker_free(walker);
765
766         for (i = 0; i < nr_heads; i++)
767                 free(targets[i]);
768         free(targets);
769
770         return ret ? error("fetch failed.") : 0;
771 }
772
773 static int fetch_git(struct discovery *heads,
774         int nr_heads, struct ref **to_fetch)
775 {
776         struct rpc_state rpc;
777         struct strbuf preamble = STRBUF_INIT;
778         int i, err;
779         struct argv_array args = ARGV_ARRAY_INIT;
780
781         argv_array_pushl(&args, "fetch-pack", "--stateless-rpc",
782                          "--stdin", "--lock-pack", NULL);
783         if (options.followtags)
784                 argv_array_push(&args, "--include-tag");
785         if (options.thin)
786                 argv_array_push(&args, "--thin");
787         if (options.verbosity >= 3)
788                 argv_array_pushl(&args, "-v", "-v", NULL);
789         if (options.check_self_contained_and_connected)
790                 argv_array_push(&args, "--check-self-contained-and-connected");
791         if (options.cloning)
792                 argv_array_push(&args, "--cloning");
793         if (options.update_shallow)
794                 argv_array_push(&args, "--update-shallow");
795         if (!options.progress)
796                 argv_array_push(&args, "--no-progress");
797         if (options.depth)
798                 argv_array_pushf(&args, "--depth=%lu", options.depth);
799         if (options.deepen_since)
800                 argv_array_pushf(&args, "--shallow-since=%s", options.deepen_since);
801         for (i = 0; i < options.deepen_not.nr; i++)
802                 argv_array_pushf(&args, "--shallow-exclude=%s",
803                                  options.deepen_not.items[i].string);
804         if (options.deepen_relative && options.depth)
805                 argv_array_push(&args, "--deepen-relative");
806         argv_array_push(&args, url.buf);
807
808         for (i = 0; i < nr_heads; i++) {
809                 struct ref *ref = to_fetch[i];
810                 if (!*ref->name)
811                         die("cannot fetch by sha1 over smart http");
812                 packet_buf_write(&preamble, "%s %s\n",
813                                  oid_to_hex(&ref->old_oid), ref->name);
814         }
815         packet_buf_flush(&preamble);
816
817         memset(&rpc, 0, sizeof(rpc));
818         rpc.service_name = "git-upload-pack",
819         rpc.argv = args.argv;
820         rpc.stdin_preamble = &preamble;
821         rpc.gzip_request = 1;
822
823         err = rpc_service(&rpc, heads);
824         if (rpc.result.len)
825                 write_or_die(1, rpc.result.buf, rpc.result.len);
826         strbuf_release(&rpc.result);
827         strbuf_release(&preamble);
828         argv_array_clear(&args);
829         return err;
830 }
831
832 static int fetch(int nr_heads, struct ref **to_fetch)
833 {
834         struct discovery *d = discover_refs("git-upload-pack", 0);
835         if (d->proto_git)
836                 return fetch_git(d, nr_heads, to_fetch);
837         else
838                 return fetch_dumb(nr_heads, to_fetch);
839 }
840
841 static void parse_fetch(struct strbuf *buf)
842 {
843         struct ref **to_fetch = NULL;
844         struct ref *list_head = NULL;
845         struct ref **list = &list_head;
846         int alloc_heads = 0, nr_heads = 0;
847
848         do {
849                 const char *p;
850                 if (skip_prefix(buf->buf, "fetch ", &p)) {
851                         const char *name;
852                         struct ref *ref;
853                         struct object_id old_oid;
854
855                         if (get_oid_hex(p, &old_oid))
856                                 die("protocol error: expected sha/ref, got %s'", p);
857                         if (p[GIT_SHA1_HEXSZ] == ' ')
858                                 name = p + GIT_SHA1_HEXSZ + 1;
859                         else if (!p[GIT_SHA1_HEXSZ])
860                                 name = "";
861                         else
862                                 die("protocol error: expected sha/ref, got %s'", p);
863
864                         ref = alloc_ref(name);
865                         oidcpy(&ref->old_oid, &old_oid);
866
867                         *list = ref;
868                         list = &ref->next;
869
870                         ALLOC_GROW(to_fetch, nr_heads + 1, alloc_heads);
871                         to_fetch[nr_heads++] = ref;
872                 }
873                 else
874                         die("http transport does not support %s", buf->buf);
875
876                 strbuf_reset(buf);
877                 if (strbuf_getline_lf(buf, stdin) == EOF)
878                         return;
879                 if (!*buf->buf)
880                         break;
881         } while (1);
882
883         if (fetch(nr_heads, to_fetch))
884                 exit(128); /* error already reported */
885         free_refs(list_head);
886         free(to_fetch);
887
888         printf("\n");
889         fflush(stdout);
890         strbuf_reset(buf);
891 }
892
893 static int push_dav(int nr_spec, char **specs)
894 {
895         struct child_process child = CHILD_PROCESS_INIT;
896         size_t i;
897
898         child.git_cmd = 1;
899         argv_array_push(&child.args, "http-push");
900         argv_array_push(&child.args, "--helper-status");
901         if (options.dry_run)
902                 argv_array_push(&child.args, "--dry-run");
903         if (options.verbosity > 1)
904                 argv_array_push(&child.args, "--verbose");
905         argv_array_push(&child.args, url.buf);
906         for (i = 0; i < nr_spec; i++)
907                 argv_array_push(&child.args, specs[i]);
908
909         if (run_command(&child))
910                 die("git-http-push failed");
911         return 0;
912 }
913
914 static int push_git(struct discovery *heads, int nr_spec, char **specs)
915 {
916         struct rpc_state rpc;
917         int i, err;
918         struct argv_array args;
919         struct string_list_item *cas_option;
920         struct strbuf preamble = STRBUF_INIT;
921
922         argv_array_init(&args);
923         argv_array_pushl(&args, "send-pack", "--stateless-rpc", "--helper-status",
924                          NULL);
925
926         if (options.thin)
927                 argv_array_push(&args, "--thin");
928         if (options.dry_run)
929                 argv_array_push(&args, "--dry-run");
930         if (options.push_cert == SEND_PACK_PUSH_CERT_ALWAYS)
931                 argv_array_push(&args, "--signed=yes");
932         else if (options.push_cert == SEND_PACK_PUSH_CERT_IF_ASKED)
933                 argv_array_push(&args, "--signed=if-asked");
934         if (options.verbosity == 0)
935                 argv_array_push(&args, "--quiet");
936         else if (options.verbosity > 1)
937                 argv_array_push(&args, "--verbose");
938         argv_array_push(&args, options.progress ? "--progress" : "--no-progress");
939         for_each_string_list_item(cas_option, &cas_options)
940                 argv_array_push(&args, cas_option->string);
941         argv_array_push(&args, url.buf);
942
943         argv_array_push(&args, "--stdin");
944         for (i = 0; i < nr_spec; i++)
945                 packet_buf_write(&preamble, "%s\n", specs[i]);
946         packet_buf_flush(&preamble);
947
948         memset(&rpc, 0, sizeof(rpc));
949         rpc.service_name = "git-receive-pack",
950         rpc.argv = args.argv;
951         rpc.stdin_preamble = &preamble;
952
953         err = rpc_service(&rpc, heads);
954         if (rpc.result.len)
955                 write_or_die(1, rpc.result.buf, rpc.result.len);
956         strbuf_release(&rpc.result);
957         strbuf_release(&preamble);
958         argv_array_clear(&args);
959         return err;
960 }
961
962 static int push(int nr_spec, char **specs)
963 {
964         struct discovery *heads = discover_refs("git-receive-pack", 1);
965         int ret;
966
967         if (heads->proto_git)
968                 ret = push_git(heads, nr_spec, specs);
969         else
970                 ret = push_dav(nr_spec, specs);
971         free_discovery(heads);
972         return ret;
973 }
974
975 static void parse_push(struct strbuf *buf)
976 {
977         char **specs = NULL;
978         int alloc_spec = 0, nr_spec = 0, i, ret;
979
980         do {
981                 if (starts_with(buf->buf, "push ")) {
982                         ALLOC_GROW(specs, nr_spec + 1, alloc_spec);
983                         specs[nr_spec++] = xstrdup(buf->buf + 5);
984                 }
985                 else
986                         die("http transport does not support %s", buf->buf);
987
988                 strbuf_reset(buf);
989                 if (strbuf_getline_lf(buf, stdin) == EOF)
990                         goto free_specs;
991                 if (!*buf->buf)
992                         break;
993         } while (1);
994
995         ret = push(nr_spec, specs);
996         printf("\n");
997         fflush(stdout);
998
999         if (ret)
1000                 exit(128); /* error already reported */
1001
1002  free_specs:
1003         for (i = 0; i < nr_spec; i++)
1004                 free(specs[i]);
1005         free(specs);
1006 }
1007
1008 int cmd_main(int argc, const char **argv)
1009 {
1010         struct strbuf buf = STRBUF_INIT;
1011         int nongit;
1012
1013         setup_git_directory_gently(&nongit);
1014         if (argc < 2) {
1015                 error("remote-curl: usage: git remote-curl <remote> [<url>]");
1016                 return 1;
1017         }
1018
1019         options.verbosity = 1;
1020         options.progress = !!isatty(2);
1021         options.thin = 1;
1022         string_list_init(&options.deepen_not, 1);
1023
1024         remote = remote_get(argv[1]);
1025
1026         if (argc > 2) {
1027                 end_url_with_slash(&url, argv[2]);
1028         } else {
1029                 end_url_with_slash(&url, remote->url[0]);
1030         }
1031
1032         http_init(remote, url.buf, 0);
1033
1034         do {
1035                 const char *arg;
1036
1037                 if (strbuf_getline_lf(&buf, stdin) == EOF) {
1038                         if (ferror(stdin))
1039                                 error("remote-curl: error reading command stream from git");
1040                         return 1;
1041                 }
1042                 if (buf.len == 0)
1043                         break;
1044                 if (starts_with(buf.buf, "fetch ")) {
1045                         if (nongit)
1046                                 die("remote-curl: fetch attempted without a local repo");
1047                         parse_fetch(&buf);
1048
1049                 } else if (!strcmp(buf.buf, "list") || starts_with(buf.buf, "list ")) {
1050                         int for_push = !!strstr(buf.buf + 4, "for-push");
1051                         output_refs(get_refs(for_push));
1052
1053                 } else if (starts_with(buf.buf, "push ")) {
1054                         parse_push(&buf);
1055
1056                 } else if (skip_prefix(buf.buf, "option ", &arg)) {
1057                         char *value = strchr(arg, ' ');
1058                         int result;
1059
1060                         if (value)
1061                                 *value++ = '\0';
1062                         else
1063                                 value = "true";
1064
1065                         result = set_option(arg, value);
1066                         if (!result)
1067                                 printf("ok\n");
1068                         else if (result < 0)
1069                                 printf("error invalid value\n");
1070                         else
1071                                 printf("unsupported\n");
1072                         fflush(stdout);
1073
1074                 } else if (!strcmp(buf.buf, "capabilities")) {
1075                         printf("fetch\n");
1076                         printf("option\n");
1077                         printf("push\n");
1078                         printf("check-connectivity\n");
1079                         printf("\n");
1080                         fflush(stdout);
1081                 } else {
1082                         error("remote-curl: unknown command '%s' from git", buf.buf);
1083                         return 1;
1084                 }
1085                 strbuf_reset(&buf);
1086         } while (1);
1087
1088         http_cleanup();
1089
1090         return 0;
1091 }