Merge branch 'ah/show-ref-usage-string'
[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         unsigned progress : 1,
24                 check_self_contained_and_connected : 1,
25                 cloning : 1,
26                 update_shallow : 1,
27                 followtags : 1,
28                 dry_run : 1,
29                 thin : 1,
30                 /* One of the SEND_PACK_PUSH_CERT_* constants. */
31                 push_cert : 2;
32 };
33 static struct options options;
34 static struct string_list cas_options = STRING_LIST_INIT_DUP;
35
36 static int set_option(const char *name, const char *value)
37 {
38         if (!strcmp(name, "verbosity")) {
39                 char *end;
40                 int v = strtol(value, &end, 10);
41                 if (value == end || *end)
42                         return -1;
43                 options.verbosity = v;
44                 return 0;
45         }
46         else if (!strcmp(name, "progress")) {
47                 if (!strcmp(value, "true"))
48                         options.progress = 1;
49                 else if (!strcmp(value, "false"))
50                         options.progress = 0;
51                 else
52                         return -1;
53                 return 0;
54         }
55         else if (!strcmp(name, "depth")) {
56                 char *end;
57                 unsigned long v = strtoul(value, &end, 10);
58                 if (value == end || *end)
59                         return -1;
60                 options.depth = v;
61                 return 0;
62         }
63         else if (!strcmp(name, "followtags")) {
64                 if (!strcmp(value, "true"))
65                         options.followtags = 1;
66                 else if (!strcmp(value, "false"))
67                         options.followtags = 0;
68                 else
69                         return -1;
70                 return 0;
71         }
72         else if (!strcmp(name, "dry-run")) {
73                 if (!strcmp(value, "true"))
74                         options.dry_run = 1;
75                 else if (!strcmp(value, "false"))
76                         options.dry_run = 0;
77                 else
78                         return -1;
79                 return 0;
80         }
81         else if (!strcmp(name, "check-connectivity")) {
82                 if (!strcmp(value, "true"))
83                         options.check_self_contained_and_connected = 1;
84                 else if (!strcmp(value, "false"))
85                         options.check_self_contained_and_connected = 0;
86                 else
87                         return -1;
88                 return 0;
89         }
90         else if (!strcmp(name, "cas")) {
91                 struct strbuf val = STRBUF_INIT;
92                 strbuf_addf(&val, "--" CAS_OPT_NAME "=%s", value);
93                 string_list_append(&cas_options, val.buf);
94                 strbuf_release(&val);
95                 return 0;
96         } else if (!strcmp(name, "cloning")) {
97                 if (!strcmp(value, "true"))
98                         options.cloning = 1;
99                 else if (!strcmp(value, "false"))
100                         options.cloning = 0;
101                 else
102                         return -1;
103                 return 0;
104         } else if (!strcmp(name, "update-shallow")) {
105                 if (!strcmp(value, "true"))
106                         options.update_shallow = 1;
107                 else if (!strcmp(value, "false"))
108                         options.update_shallow = 0;
109                 else
110                         return -1;
111                 return 0;
112         } else if (!strcmp(name, "pushcert")) {
113                 if (!strcmp(value, "true"))
114                         options.push_cert = SEND_PACK_PUSH_CERT_ALWAYS;
115                 else if (!strcmp(value, "false"))
116                         options.push_cert = SEND_PACK_PUSH_CERT_NEVER;
117                 else if (!strcmp(value, "if-asked"))
118                         options.push_cert = SEND_PACK_PUSH_CERT_IF_ASKED;
119                 else
120                         return -1;
121                 return 0;
122         } else {
123                 return 1 /* unsupported */;
124         }
125 }
126
127 struct discovery {
128         const char *service;
129         char *buf_alloc;
130         char *buf;
131         size_t len;
132         struct ref *refs;
133         struct sha1_array shallow;
134         unsigned proto_git : 1;
135 };
136 static struct discovery *last_discovery;
137
138 static struct ref *parse_git_refs(struct discovery *heads, int for_push)
139 {
140         struct ref *list = NULL;
141         get_remote_heads(-1, heads->buf, heads->len, &list,
142                          for_push ? REF_NORMAL : 0, NULL, &heads->shallow);
143         return list;
144 }
145
146 static struct ref *parse_info_refs(struct discovery *heads)
147 {
148         char *data, *start, *mid;
149         char *ref_name;
150         int i = 0;
151
152         struct ref *refs = NULL;
153         struct ref *ref = NULL;
154         struct ref *last_ref = NULL;
155
156         data = heads->buf;
157         start = NULL;
158         mid = data;
159         while (i < heads->len) {
160                 if (!start) {
161                         start = &data[i];
162                 }
163                 if (data[i] == '\t')
164                         mid = &data[i];
165                 if (data[i] == '\n') {
166                         if (mid - start != 40)
167                                 die("%sinfo/refs not valid: is this a git repository?",
168                                     url.buf);
169                         data[i] = 0;
170                         ref_name = mid + 1;
171                         ref = xmalloc(sizeof(struct ref) +
172                                       strlen(ref_name) + 1);
173                         memset(ref, 0, sizeof(struct ref));
174                         strcpy(ref->name, ref_name);
175                         get_sha1_hex(start, ref->old_sha1);
176                         if (!refs)
177                                 refs = ref;
178                         if (last_ref)
179                                 last_ref->next = ref;
180                         last_ref = ref;
181                         start = NULL;
182                 }
183                 i++;
184         }
185
186         ref = alloc_ref("HEAD");
187         if (!http_fetch_ref(url.buf, ref) &&
188             !resolve_remote_symref(ref, refs)) {
189                 ref->next = refs;
190                 refs = ref;
191         } else {
192                 free(ref);
193         }
194
195         return refs;
196 }
197
198 static void free_discovery(struct discovery *d)
199 {
200         if (d) {
201                 if (d == last_discovery)
202                         last_discovery = NULL;
203                 free(d->shallow.sha1);
204                 free(d->buf_alloc);
205                 free_refs(d->refs);
206                 free(d);
207         }
208 }
209
210 static int show_http_message(struct strbuf *type, struct strbuf *charset,
211                              struct strbuf *msg)
212 {
213         const char *p, *eol;
214
215         /*
216          * We only show text/plain parts, as other types are likely
217          * to be ugly to look at on the user's terminal.
218          */
219         if (strcmp(type->buf, "text/plain"))
220                 return -1;
221         if (charset->len)
222                 strbuf_reencode(msg, charset->buf, get_log_output_encoding());
223
224         strbuf_trim(msg);
225         if (!msg->len)
226                 return -1;
227
228         p = msg->buf;
229         do {
230                 eol = strchrnul(p, '\n');
231                 fprintf(stderr, "remote: %.*s\n", (int)(eol - p), p);
232                 p = eol + 1;
233         } while(*eol);
234         return 0;
235 }
236
237 static struct discovery *discover_refs(const char *service, int for_push)
238 {
239         struct strbuf exp = STRBUF_INIT;
240         struct strbuf type = STRBUF_INIT;
241         struct strbuf charset = STRBUF_INIT;
242         struct strbuf buffer = STRBUF_INIT;
243         struct strbuf refs_url = STRBUF_INIT;
244         struct strbuf effective_url = STRBUF_INIT;
245         struct discovery *last = last_discovery;
246         int http_ret, maybe_smart = 0;
247         struct http_get_options options;
248
249         if (last && !strcmp(service, last->service))
250                 return last;
251         free_discovery(last);
252
253         strbuf_addf(&refs_url, "%sinfo/refs", url.buf);
254         if ((starts_with(url.buf, "http://") || starts_with(url.buf, "https://")) &&
255              git_env_bool("GIT_SMART_HTTP", 1)) {
256                 maybe_smart = 1;
257                 if (!strchr(url.buf, '?'))
258                         strbuf_addch(&refs_url, '?');
259                 else
260                         strbuf_addch(&refs_url, '&');
261                 strbuf_addf(&refs_url, "service=%s", service);
262         }
263
264         memset(&options, 0, sizeof(options));
265         options.content_type = &type;
266         options.charset = &charset;
267         options.effective_url = &effective_url;
268         options.base_url = &url;
269         options.no_cache = 1;
270         options.keep_error = 1;
271
272         http_ret = http_get_strbuf(refs_url.buf, &buffer, &options);
273         switch (http_ret) {
274         case HTTP_OK:
275                 break;
276         case HTTP_MISSING_TARGET:
277                 show_http_message(&type, &charset, &buffer);
278                 die("repository '%s' not found", url.buf);
279         case HTTP_NOAUTH:
280                 show_http_message(&type, &charset, &buffer);
281                 die("Authentication failed for '%s'", url.buf);
282         default:
283                 show_http_message(&type, &charset, &buffer);
284                 die("unable to access '%s': %s", url.buf, curl_errorstr);
285         }
286
287         last= xcalloc(1, sizeof(*last_discovery));
288         last->service = service;
289         last->buf_alloc = strbuf_detach(&buffer, &last->len);
290         last->buf = last->buf_alloc;
291
292         strbuf_addf(&exp, "application/x-%s-advertisement", service);
293         if (maybe_smart &&
294             (5 <= last->len && last->buf[4] == '#') &&
295             !strbuf_cmp(&exp, &type)) {
296                 char *line;
297
298                 /*
299                  * smart HTTP response; validate that the service
300                  * pkt-line matches our request.
301                  */
302                 line = packet_read_line_buf(&last->buf, &last->len, NULL);
303
304                 strbuf_reset(&exp);
305                 strbuf_addf(&exp, "# service=%s", service);
306                 if (strcmp(line, exp.buf))
307                         die("invalid server response; got '%s'", line);
308                 strbuf_release(&exp);
309
310                 /* The header can include additional metadata lines, up
311                  * until a packet flush marker.  Ignore these now, but
312                  * in the future we might start to scan them.
313                  */
314                 while (packet_read_line_buf(&last->buf, &last->len, NULL))
315                         ;
316
317                 last->proto_git = 1;
318         }
319
320         if (last->proto_git)
321                 last->refs = parse_git_refs(last, for_push);
322         else
323                 last->refs = parse_info_refs(last);
324
325         strbuf_release(&refs_url);
326         strbuf_release(&exp);
327         strbuf_release(&type);
328         strbuf_release(&charset);
329         strbuf_release(&effective_url);
330         strbuf_release(&buffer);
331         last_discovery = last;
332         return last;
333 }
334
335 static struct ref *get_refs(int for_push)
336 {
337         struct discovery *heads;
338
339         if (for_push)
340                 heads = discover_refs("git-receive-pack", for_push);
341         else
342                 heads = discover_refs("git-upload-pack", for_push);
343
344         return heads->refs;
345 }
346
347 static void output_refs(struct ref *refs)
348 {
349         struct ref *posn;
350         for (posn = refs; posn; posn = posn->next) {
351                 if (posn->symref)
352                         printf("@%s %s\n", posn->symref, posn->name);
353                 else
354                         printf("%s %s\n", sha1_to_hex(posn->old_sha1), posn->name);
355         }
356         printf("\n");
357         fflush(stdout);
358 }
359
360 struct rpc_state {
361         const char *service_name;
362         const char **argv;
363         struct strbuf *stdin_preamble;
364         char *service_url;
365         char *hdr_content_type;
366         char *hdr_accept;
367         char *buf;
368         size_t alloc;
369         size_t len;
370         size_t pos;
371         int in;
372         int out;
373         struct strbuf result;
374         unsigned gzip_request : 1;
375         unsigned initial_buffer : 1;
376 };
377
378 static size_t rpc_out(void *ptr, size_t eltsize,
379                 size_t nmemb, void *buffer_)
380 {
381         size_t max = eltsize * nmemb;
382         struct rpc_state *rpc = buffer_;
383         size_t avail = rpc->len - rpc->pos;
384
385         if (!avail) {
386                 rpc->initial_buffer = 0;
387                 avail = packet_read(rpc->out, NULL, NULL, rpc->buf, rpc->alloc, 0);
388                 if (!avail)
389                         return 0;
390                 rpc->pos = 0;
391                 rpc->len = avail;
392         }
393
394         if (max < avail)
395                 avail = max;
396         memcpy(ptr, rpc->buf + rpc->pos, avail);
397         rpc->pos += avail;
398         return avail;
399 }
400
401 #ifndef NO_CURL_IOCTL
402 static curlioerr rpc_ioctl(CURL *handle, int cmd, void *clientp)
403 {
404         struct rpc_state *rpc = clientp;
405
406         switch (cmd) {
407         case CURLIOCMD_NOP:
408                 return CURLIOE_OK;
409
410         case CURLIOCMD_RESTARTREAD:
411                 if (rpc->initial_buffer) {
412                         rpc->pos = 0;
413                         return CURLIOE_OK;
414                 }
415                 error("unable to rewind rpc post data - try increasing http.postBuffer");
416                 return CURLIOE_FAILRESTART;
417
418         default:
419                 return CURLIOE_UNKNOWNCMD;
420         }
421 }
422 #endif
423
424 static size_t rpc_in(char *ptr, size_t eltsize,
425                 size_t nmemb, void *buffer_)
426 {
427         size_t size = eltsize * nmemb;
428         struct rpc_state *rpc = buffer_;
429         write_or_die(rpc->in, ptr, size);
430         return size;
431 }
432
433 static int run_slot(struct active_request_slot *slot,
434                     struct slot_results *results)
435 {
436         int err;
437         struct slot_results results_buf;
438
439         if (!results)
440                 results = &results_buf;
441
442         err = run_one_slot(slot, results);
443
444         if (err != HTTP_OK && err != HTTP_REAUTH) {
445                 error("RPC failed; result=%d, HTTP code = %ld",
446                       results->curl_result, results->http_code);
447         }
448
449         return err;
450 }
451
452 static int probe_rpc(struct rpc_state *rpc, struct slot_results *results)
453 {
454         struct active_request_slot *slot;
455         struct curl_slist *headers = NULL;
456         struct strbuf buf = STRBUF_INIT;
457         int err;
458
459         slot = get_active_slot();
460
461         headers = curl_slist_append(headers, rpc->hdr_content_type);
462         headers = curl_slist_append(headers, rpc->hdr_accept);
463
464         curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
465         curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
466         curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
467         curl_easy_setopt(slot->curl, CURLOPT_ENCODING, NULL);
468         curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, "0000");
469         curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, 4);
470         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
471         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
472         curl_easy_setopt(slot->curl, CURLOPT_FILE, &buf);
473
474         err = run_slot(slot, results);
475
476         curl_slist_free_all(headers);
477         strbuf_release(&buf);
478         return err;
479 }
480
481 static int post_rpc(struct rpc_state *rpc)
482 {
483         struct active_request_slot *slot;
484         struct curl_slist *headers = NULL;
485         int use_gzip = rpc->gzip_request;
486         char *gzip_body = NULL;
487         size_t gzip_size = 0;
488         int err, large_request = 0;
489         int needs_100_continue = 0;
490
491         /* Try to load the entire request, if we can fit it into the
492          * allocated buffer space we can use HTTP/1.0 and avoid the
493          * chunked encoding mess.
494          */
495         while (1) {
496                 size_t left = rpc->alloc - rpc->len;
497                 char *buf = rpc->buf + rpc->len;
498                 int n;
499
500                 if (left < LARGE_PACKET_MAX) {
501                         large_request = 1;
502                         use_gzip = 0;
503                         break;
504                 }
505
506                 n = packet_read(rpc->out, NULL, NULL, buf, left, 0);
507                 if (!n)
508                         break;
509                 rpc->len += n;
510         }
511
512         if (large_request) {
513                 struct slot_results results;
514
515                 do {
516                         err = probe_rpc(rpc, &results);
517                         if (err == HTTP_REAUTH)
518                                 credential_fill(&http_auth);
519                 } while (err == HTTP_REAUTH);
520                 if (err != HTTP_OK)
521                         return -1;
522
523                 if (results.auth_avail & CURLAUTH_GSSNEGOTIATE)
524                         needs_100_continue = 1;
525         }
526
527         headers = curl_slist_append(headers, rpc->hdr_content_type);
528         headers = curl_slist_append(headers, rpc->hdr_accept);
529         headers = curl_slist_append(headers, needs_100_continue ?
530                 "Expect: 100-continue" : "Expect:");
531
532 retry:
533         slot = get_active_slot();
534
535         curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
536         curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
537         curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
538         curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "gzip");
539
540         if (large_request) {
541                 /* The request body is large and the size cannot be predicted.
542                  * We must use chunked encoding to send it.
543                  */
544                 headers = curl_slist_append(headers, "Transfer-Encoding: chunked");
545                 rpc->initial_buffer = 1;
546                 curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, rpc_out);
547                 curl_easy_setopt(slot->curl, CURLOPT_INFILE, rpc);
548 #ifndef NO_CURL_IOCTL
549                 curl_easy_setopt(slot->curl, CURLOPT_IOCTLFUNCTION, rpc_ioctl);
550                 curl_easy_setopt(slot->curl, CURLOPT_IOCTLDATA, rpc);
551 #endif
552                 if (options.verbosity > 1) {
553                         fprintf(stderr, "POST %s (chunked)\n", rpc->service_name);
554                         fflush(stderr);
555                 }
556
557         } else if (gzip_body) {
558                 /*
559                  * If we are looping to retry authentication, then the previous
560                  * run will have set up the headers and gzip buffer already,
561                  * and we just need to send it.
562                  */
563                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);
564                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, gzip_size);
565
566         } else if (use_gzip && 1024 < rpc->len) {
567                 /* The client backend isn't giving us compressed data so
568                  * we can try to deflate it ourselves, this may save on.
569                  * the transfer time.
570                  */
571                 git_zstream stream;
572                 int ret;
573
574                 git_deflate_init_gzip(&stream, Z_BEST_COMPRESSION);
575                 gzip_size = git_deflate_bound(&stream, rpc->len);
576                 gzip_body = xmalloc(gzip_size);
577
578                 stream.next_in = (unsigned char *)rpc->buf;
579                 stream.avail_in = rpc->len;
580                 stream.next_out = (unsigned char *)gzip_body;
581                 stream.avail_out = gzip_size;
582
583                 ret = git_deflate(&stream, Z_FINISH);
584                 if (ret != Z_STREAM_END)
585                         die("cannot deflate request; zlib deflate error %d", ret);
586
587                 ret = git_deflate_end_gently(&stream);
588                 if (ret != Z_OK)
589                         die("cannot deflate request; zlib end error %d", ret);
590
591                 gzip_size = stream.total_out;
592
593                 headers = curl_slist_append(headers, "Content-Encoding: gzip");
594                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);
595                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, gzip_size);
596
597                 if (options.verbosity > 1) {
598                         fprintf(stderr, "POST %s (gzip %lu to %lu bytes)\n",
599                                 rpc->service_name,
600                                 (unsigned long)rpc->len, (unsigned long)gzip_size);
601                         fflush(stderr);
602                 }
603         } else {
604                 /* We know the complete request size in advance, use the
605                  * more normal Content-Length approach.
606                  */
607                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, rpc->buf);
608                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, rpc->len);
609                 if (options.verbosity > 1) {
610                         fprintf(stderr, "POST %s (%lu bytes)\n",
611                                 rpc->service_name, (unsigned long)rpc->len);
612                         fflush(stderr);
613                 }
614         }
615
616         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
617         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, rpc_in);
618         curl_easy_setopt(slot->curl, CURLOPT_FILE, rpc);
619
620         err = run_slot(slot, NULL);
621         if (err == HTTP_REAUTH && !large_request) {
622                 credential_fill(&http_auth);
623                 goto retry;
624         }
625         if (err != HTTP_OK)
626                 err = -1;
627
628         curl_slist_free_all(headers);
629         free(gzip_body);
630         return err;
631 }
632
633 static int rpc_service(struct rpc_state *rpc, struct discovery *heads)
634 {
635         const char *svc = rpc->service_name;
636         struct strbuf buf = STRBUF_INIT;
637         struct strbuf *preamble = rpc->stdin_preamble;
638         struct child_process client = CHILD_PROCESS_INIT;
639         int err = 0;
640
641         client.in = -1;
642         client.out = -1;
643         client.git_cmd = 1;
644         client.argv = rpc->argv;
645         if (start_command(&client))
646                 exit(1);
647         if (preamble)
648                 write_or_die(client.in, preamble->buf, preamble->len);
649         if (heads)
650                 write_or_die(client.in, heads->buf, heads->len);
651
652         rpc->alloc = http_post_buffer;
653         rpc->buf = xmalloc(rpc->alloc);
654         rpc->in = client.in;
655         rpc->out = client.out;
656         strbuf_init(&rpc->result, 0);
657
658         strbuf_addf(&buf, "%s%s", url.buf, svc);
659         rpc->service_url = strbuf_detach(&buf, NULL);
660
661         strbuf_addf(&buf, "Content-Type: application/x-%s-request", svc);
662         rpc->hdr_content_type = strbuf_detach(&buf, NULL);
663
664         strbuf_addf(&buf, "Accept: application/x-%s-result", svc);
665         rpc->hdr_accept = strbuf_detach(&buf, NULL);
666
667         while (!err) {
668                 int n = packet_read(rpc->out, NULL, NULL, rpc->buf, rpc->alloc, 0);
669                 if (!n)
670                         break;
671                 rpc->pos = 0;
672                 rpc->len = n;
673                 err |= post_rpc(rpc);
674         }
675
676         close(client.in);
677         client.in = -1;
678         if (!err) {
679                 strbuf_read(&rpc->result, client.out, 0);
680         } else {
681                 char buf[4096];
682                 for (;;)
683                         if (xread(client.out, buf, sizeof(buf)) <= 0)
684                                 break;
685         }
686
687         close(client.out);
688         client.out = -1;
689
690         err |= finish_command(&client);
691         free(rpc->service_url);
692         free(rpc->hdr_content_type);
693         free(rpc->hdr_accept);
694         free(rpc->buf);
695         strbuf_release(&buf);
696         return err;
697 }
698
699 static int fetch_dumb(int nr_heads, struct ref **to_fetch)
700 {
701         struct walker *walker;
702         char **targets = xmalloc(nr_heads * sizeof(char*));
703         int ret, i;
704
705         if (options.depth)
706                 die("dumb http transport does not support --depth");
707         for (i = 0; i < nr_heads; i++)
708                 targets[i] = xstrdup(sha1_to_hex(to_fetch[i]->old_sha1));
709
710         walker = get_http_walker(url.buf);
711         walker->get_all = 1;
712         walker->get_tree = 1;
713         walker->get_history = 1;
714         walker->get_verbosely = options.verbosity >= 3;
715         walker->get_recover = 0;
716         ret = walker_fetch(walker, nr_heads, targets, NULL, NULL);
717         walker_free(walker);
718
719         for (i = 0; i < nr_heads; i++)
720                 free(targets[i]);
721         free(targets);
722
723         return ret ? error("fetch failed.") : 0;
724 }
725
726 static int fetch_git(struct discovery *heads,
727         int nr_heads, struct ref **to_fetch)
728 {
729         struct rpc_state rpc;
730         struct strbuf preamble = STRBUF_INIT;
731         char *depth_arg = NULL;
732         int argc = 0, i, err;
733         const char *argv[17];
734
735         argv[argc++] = "fetch-pack";
736         argv[argc++] = "--stateless-rpc";
737         argv[argc++] = "--stdin";
738         argv[argc++] = "--lock-pack";
739         if (options.followtags)
740                 argv[argc++] = "--include-tag";
741         if (options.thin)
742                 argv[argc++] = "--thin";
743         if (options.verbosity >= 3) {
744                 argv[argc++] = "-v";
745                 argv[argc++] = "-v";
746         }
747         if (options.check_self_contained_and_connected)
748                 argv[argc++] = "--check-self-contained-and-connected";
749         if (options.cloning)
750                 argv[argc++] = "--cloning";
751         if (options.update_shallow)
752                 argv[argc++] = "--update-shallow";
753         if (!options.progress)
754                 argv[argc++] = "--no-progress";
755         if (options.depth) {
756                 struct strbuf buf = STRBUF_INIT;
757                 strbuf_addf(&buf, "--depth=%lu", options.depth);
758                 depth_arg = strbuf_detach(&buf, NULL);
759                 argv[argc++] = depth_arg;
760         }
761         argv[argc++] = url.buf;
762         argv[argc++] = NULL;
763
764         for (i = 0; i < nr_heads; i++) {
765                 struct ref *ref = to_fetch[i];
766                 if (!*ref->name)
767                         die("cannot fetch by sha1 over smart http");
768                 packet_buf_write(&preamble, "%s %s\n",
769                                  sha1_to_hex(ref->old_sha1), ref->name);
770         }
771         packet_buf_flush(&preamble);
772
773         memset(&rpc, 0, sizeof(rpc));
774         rpc.service_name = "git-upload-pack",
775         rpc.argv = argv;
776         rpc.stdin_preamble = &preamble;
777         rpc.gzip_request = 1;
778
779         err = rpc_service(&rpc, heads);
780         if (rpc.result.len)
781                 write_or_die(1, rpc.result.buf, rpc.result.len);
782         strbuf_release(&rpc.result);
783         strbuf_release(&preamble);
784         free(depth_arg);
785         return err;
786 }
787
788 static int fetch(int nr_heads, struct ref **to_fetch)
789 {
790         struct discovery *d = discover_refs("git-upload-pack", 0);
791         if (d->proto_git)
792                 return fetch_git(d, nr_heads, to_fetch);
793         else
794                 return fetch_dumb(nr_heads, to_fetch);
795 }
796
797 static void parse_fetch(struct strbuf *buf)
798 {
799         struct ref **to_fetch = NULL;
800         struct ref *list_head = NULL;
801         struct ref **list = &list_head;
802         int alloc_heads = 0, nr_heads = 0;
803
804         do {
805                 const char *p;
806                 if (skip_prefix(buf->buf, "fetch ", &p)) {
807                         const char *name;
808                         struct ref *ref;
809                         unsigned char old_sha1[20];
810
811                         if (strlen(p) < 40 || get_sha1_hex(p, old_sha1))
812                                 die("protocol error: expected sha/ref, got %s'", p);
813                         if (p[40] == ' ')
814                                 name = p + 41;
815                         else if (!p[40])
816                                 name = "";
817                         else
818                                 die("protocol error: expected sha/ref, got %s'", p);
819
820                         ref = alloc_ref(name);
821                         hashcpy(ref->old_sha1, old_sha1);
822
823                         *list = ref;
824                         list = &ref->next;
825
826                         ALLOC_GROW(to_fetch, nr_heads + 1, alloc_heads);
827                         to_fetch[nr_heads++] = ref;
828                 }
829                 else
830                         die("http transport does not support %s", buf->buf);
831
832                 strbuf_reset(buf);
833                 if (strbuf_getline(buf, stdin, '\n') == EOF)
834                         return;
835                 if (!*buf->buf)
836                         break;
837         } while (1);
838
839         if (fetch(nr_heads, to_fetch))
840                 exit(128); /* error already reported */
841         free_refs(list_head);
842         free(to_fetch);
843
844         printf("\n");
845         fflush(stdout);
846         strbuf_reset(buf);
847 }
848
849 static int push_dav(int nr_spec, char **specs)
850 {
851         const char **argv = xmalloc((10 + nr_spec) * sizeof(char*));
852         int argc = 0, i;
853
854         argv[argc++] = "http-push";
855         argv[argc++] = "--helper-status";
856         if (options.dry_run)
857                 argv[argc++] = "--dry-run";
858         if (options.verbosity > 1)
859                 argv[argc++] = "--verbose";
860         argv[argc++] = url.buf;
861         for (i = 0; i < nr_spec; i++)
862                 argv[argc++] = specs[i];
863         argv[argc++] = NULL;
864
865         if (run_command_v_opt(argv, RUN_GIT_CMD))
866                 die("git-%s failed", argv[0]);
867         free(argv);
868         return 0;
869 }
870
871 static int push_git(struct discovery *heads, int nr_spec, char **specs)
872 {
873         struct rpc_state rpc;
874         int i, err;
875         struct argv_array args;
876         struct string_list_item *cas_option;
877         struct strbuf preamble = STRBUF_INIT;
878
879         argv_array_init(&args);
880         argv_array_pushl(&args, "send-pack", "--stateless-rpc", "--helper-status",
881                          NULL);
882
883         if (options.thin)
884                 argv_array_push(&args, "--thin");
885         if (options.dry_run)
886                 argv_array_push(&args, "--dry-run");
887         if (options.push_cert == SEND_PACK_PUSH_CERT_ALWAYS)
888                 argv_array_push(&args, "--signed=yes");
889         else if (options.push_cert == SEND_PACK_PUSH_CERT_IF_ASKED)
890                 argv_array_push(&args, "--signed=if-asked");
891         if (options.verbosity == 0)
892                 argv_array_push(&args, "--quiet");
893         else if (options.verbosity > 1)
894                 argv_array_push(&args, "--verbose");
895         argv_array_push(&args, options.progress ? "--progress" : "--no-progress");
896         for_each_string_list_item(cas_option, &cas_options)
897                 argv_array_push(&args, cas_option->string);
898         argv_array_push(&args, url.buf);
899
900         argv_array_push(&args, "--stdin");
901         for (i = 0; i < nr_spec; i++)
902                 packet_buf_write(&preamble, "%s\n", specs[i]);
903         packet_buf_flush(&preamble);
904
905         memset(&rpc, 0, sizeof(rpc));
906         rpc.service_name = "git-receive-pack",
907         rpc.argv = args.argv;
908         rpc.stdin_preamble = &preamble;
909
910         err = rpc_service(&rpc, heads);
911         if (rpc.result.len)
912                 write_or_die(1, rpc.result.buf, rpc.result.len);
913         strbuf_release(&rpc.result);
914         strbuf_release(&preamble);
915         argv_array_clear(&args);
916         return err;
917 }
918
919 static int push(int nr_spec, char **specs)
920 {
921         struct discovery *heads = discover_refs("git-receive-pack", 1);
922         int ret;
923
924         if (heads->proto_git)
925                 ret = push_git(heads, nr_spec, specs);
926         else
927                 ret = push_dav(nr_spec, specs);
928         free_discovery(heads);
929         return ret;
930 }
931
932 static void parse_push(struct strbuf *buf)
933 {
934         char **specs = NULL;
935         int alloc_spec = 0, nr_spec = 0, i, ret;
936
937         do {
938                 if (starts_with(buf->buf, "push ")) {
939                         ALLOC_GROW(specs, nr_spec + 1, alloc_spec);
940                         specs[nr_spec++] = xstrdup(buf->buf + 5);
941                 }
942                 else
943                         die("http transport does not support %s", buf->buf);
944
945                 strbuf_reset(buf);
946                 if (strbuf_getline(buf, stdin, '\n') == EOF)
947                         goto free_specs;
948                 if (!*buf->buf)
949                         break;
950         } while (1);
951
952         ret = push(nr_spec, specs);
953         printf("\n");
954         fflush(stdout);
955
956         if (ret)
957                 exit(128); /* error already reported */
958
959  free_specs:
960         for (i = 0; i < nr_spec; i++)
961                 free(specs[i]);
962         free(specs);
963 }
964
965 int main(int argc, const char **argv)
966 {
967         struct strbuf buf = STRBUF_INIT;
968         int nongit;
969
970         git_setup_gettext();
971
972         git_extract_argv0_path(argv[0]);
973         setup_git_directory_gently(&nongit);
974         if (argc < 2) {
975                 error("remote-curl: usage: git remote-curl <remote> [<url>]");
976                 return 1;
977         }
978
979         options.verbosity = 1;
980         options.progress = !!isatty(2);
981         options.thin = 1;
982
983         remote = remote_get(argv[1]);
984
985         if (argc > 2) {
986                 end_url_with_slash(&url, argv[2]);
987         } else {
988                 end_url_with_slash(&url, remote->url[0]);
989         }
990
991         http_init(remote, url.buf, 0);
992
993         do {
994                 const char *arg;
995
996                 if (strbuf_getline(&buf, stdin, '\n') == EOF) {
997                         if (ferror(stdin))
998                                 error("remote-curl: error reading command stream from git");
999                         return 1;
1000                 }
1001                 if (buf.len == 0)
1002                         break;
1003                 if (starts_with(buf.buf, "fetch ")) {
1004                         if (nongit)
1005                                 die("remote-curl: fetch attempted without a local repo");
1006                         parse_fetch(&buf);
1007
1008                 } else if (!strcmp(buf.buf, "list") || starts_with(buf.buf, "list ")) {
1009                         int for_push = !!strstr(buf.buf + 4, "for-push");
1010                         output_refs(get_refs(for_push));
1011
1012                 } else if (starts_with(buf.buf, "push ")) {
1013                         parse_push(&buf);
1014
1015                 } else if (skip_prefix(buf.buf, "option ", &arg)) {
1016                         char *value = strchr(arg, ' ');
1017                         int result;
1018
1019                         if (value)
1020                                 *value++ = '\0';
1021                         else
1022                                 value = "true";
1023
1024                         result = set_option(arg, value);
1025                         if (!result)
1026                                 printf("ok\n");
1027                         else if (result < 0)
1028                                 printf("error invalid value\n");
1029                         else
1030                                 printf("unsupported\n");
1031                         fflush(stdout);
1032
1033                 } else if (!strcmp(buf.buf, "capabilities")) {
1034                         printf("fetch\n");
1035                         printf("option\n");
1036                         printf("push\n");
1037                         printf("check-connectivity\n");
1038                         printf("\n");
1039                         fflush(stdout);
1040                 } else {
1041                         error("remote-curl: unknown command '%s' from git", buf.buf);
1042                         return 1;
1043                 }
1044                 strbuf_reset(&buf);
1045         } while (1);
1046
1047         http_cleanup();
1048
1049         return 0;
1050 }