Merge branch 'pw/p4'
[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 "sideband.h"
10
11 static struct remote *remote;
12 static const char *url; /* always ends with a trailing slash */
13
14 struct options {
15         int verbosity;
16         unsigned long depth;
17         unsigned progress : 1,
18                 followtags : 1,
19                 dry_run : 1,
20                 thin : 1;
21 };
22 static struct options options;
23
24 static int set_option(const char *name, const char *value)
25 {
26         if (!strcmp(name, "verbosity")) {
27                 char *end;
28                 int v = strtol(value, &end, 10);
29                 if (value == end || *end)
30                         return -1;
31                 options.verbosity = v;
32                 return 0;
33         }
34         else if (!strcmp(name, "progress")) {
35                 if (!strcmp(value, "true"))
36                         options.progress = 1;
37                 else if (!strcmp(value, "false"))
38                         options.progress = 0;
39                 else
40                         return -1;
41                 return 0;
42         }
43         else if (!strcmp(name, "depth")) {
44                 char *end;
45                 unsigned long v = strtoul(value, &end, 10);
46                 if (value == end || *end)
47                         return -1;
48                 options.depth = v;
49                 return 0;
50         }
51         else if (!strcmp(name, "followtags")) {
52                 if (!strcmp(value, "true"))
53                         options.followtags = 1;
54                 else if (!strcmp(value, "false"))
55                         options.followtags = 0;
56                 else
57                         return -1;
58                 return 0;
59         }
60         else if (!strcmp(name, "dry-run")) {
61                 if (!strcmp(value, "true"))
62                         options.dry_run = 1;
63                 else if (!strcmp(value, "false"))
64                         options.dry_run = 0;
65                 else
66                         return -1;
67                 return 0;
68         }
69         else {
70                 return 1 /* unsupported */;
71         }
72 }
73
74 struct discovery {
75         const char *service;
76         char *buf_alloc;
77         char *buf;
78         size_t len;
79         unsigned proto_git : 1;
80 };
81 static struct discovery *last_discovery;
82
83 static void free_discovery(struct discovery *d)
84 {
85         if (d) {
86                 if (d == last_discovery)
87                         last_discovery = NULL;
88                 free(d->buf_alloc);
89                 free(d);
90         }
91 }
92
93 static struct discovery* discover_refs(const char *service)
94 {
95         struct strbuf buffer = STRBUF_INIT;
96         struct discovery *last = last_discovery;
97         char *refs_url;
98         int http_ret, is_http = 0, proto_git_candidate = 1;
99
100         if (last && !strcmp(service, last->service))
101                 return last;
102         free_discovery(last);
103
104         strbuf_addf(&buffer, "%sinfo/refs", url);
105         if (!prefixcmp(url, "http://") || !prefixcmp(url, "https://")) {
106                 is_http = 1;
107                 if (!strchr(url, '?'))
108                         strbuf_addch(&buffer, '?');
109                 else
110                         strbuf_addch(&buffer, '&');
111                 strbuf_addf(&buffer, "service=%s", service);
112         }
113         refs_url = strbuf_detach(&buffer, NULL);
114
115         http_ret = http_get_strbuf(refs_url, &buffer, HTTP_NO_CACHE);
116
117         /* try again with "plain" url (no ? or & appended) */
118         if (http_ret != HTTP_OK) {
119                 free(refs_url);
120                 strbuf_reset(&buffer);
121
122                 proto_git_candidate = 0;
123                 strbuf_addf(&buffer, "%sinfo/refs", url);
124                 refs_url = strbuf_detach(&buffer, NULL);
125
126                 http_ret = http_get_strbuf(refs_url, &buffer, HTTP_NO_CACHE);
127         }
128
129         switch (http_ret) {
130         case HTTP_OK:
131                 break;
132         case HTTP_MISSING_TARGET:
133                 die("%s not found: did you run git update-server-info on the"
134                     " server?", refs_url);
135         case HTTP_NOAUTH:
136                 die("Authentication failed");
137         default:
138                 http_error(refs_url, http_ret);
139                 die("HTTP request failed");
140         }
141
142         last= xcalloc(1, sizeof(*last_discovery));
143         last->service = service;
144         last->buf_alloc = strbuf_detach(&buffer, &last->len);
145         last->buf = last->buf_alloc;
146
147         if (is_http && proto_git_candidate
148                 && 5 <= last->len && last->buf[4] == '#') {
149                 /* smart HTTP response; validate that the service
150                  * pkt-line matches our request.
151                  */
152                 struct strbuf exp = STRBUF_INIT;
153
154                 if (packet_get_line(&buffer, &last->buf, &last->len) <= 0)
155                         die("%s has invalid packet header", refs_url);
156                 if (buffer.len && buffer.buf[buffer.len - 1] == '\n')
157                         strbuf_setlen(&buffer, buffer.len - 1);
158
159                 strbuf_addf(&exp, "# service=%s", service);
160                 if (strbuf_cmp(&exp, &buffer))
161                         die("invalid server response; got '%s'", buffer.buf);
162                 strbuf_release(&exp);
163
164                 /* The header can include additional metadata lines, up
165                  * until a packet flush marker.  Ignore these now, but
166                  * in the future we might start to scan them.
167                  */
168                 strbuf_reset(&buffer);
169                 while (packet_get_line(&buffer, &last->buf, &last->len) > 0)
170                         strbuf_reset(&buffer);
171
172                 last->proto_git = 1;
173         }
174
175         free(refs_url);
176         strbuf_release(&buffer);
177         last_discovery = last;
178         return last;
179 }
180
181 static int write_discovery(int in, int out, void *data)
182 {
183         struct discovery *heads = data;
184         int err = 0;
185         if (write_in_full(out, heads->buf, heads->len) != heads->len)
186                 err = 1;
187         close(out);
188         return err;
189 }
190
191 static struct ref *parse_git_refs(struct discovery *heads)
192 {
193         struct ref *list = NULL;
194         struct async async;
195
196         memset(&async, 0, sizeof(async));
197         async.proc = write_discovery;
198         async.data = heads;
199         async.out = -1;
200
201         if (start_async(&async))
202                 die("cannot start thread to parse advertised refs");
203         get_remote_heads(async.out, &list, 0, NULL, 0, NULL);
204         close(async.out);
205         if (finish_async(&async))
206                 die("ref parsing thread failed");
207         return list;
208 }
209
210 static struct ref *parse_info_refs(struct discovery *heads)
211 {
212         char *data, *start, *mid;
213         char *ref_name;
214         int i = 0;
215
216         struct ref *refs = NULL;
217         struct ref *ref = NULL;
218         struct ref *last_ref = NULL;
219
220         data = heads->buf;
221         start = NULL;
222         mid = data;
223         while (i < heads->len) {
224                 if (!start) {
225                         start = &data[i];
226                 }
227                 if (data[i] == '\t')
228                         mid = &data[i];
229                 if (data[i] == '\n') {
230                         data[i] = 0;
231                         ref_name = mid + 1;
232                         ref = xmalloc(sizeof(struct ref) +
233                                       strlen(ref_name) + 1);
234                         memset(ref, 0, sizeof(struct ref));
235                         strcpy(ref->name, ref_name);
236                         get_sha1_hex(start, ref->old_sha1);
237                         if (!refs)
238                                 refs = ref;
239                         if (last_ref)
240                                 last_ref->next = ref;
241                         last_ref = ref;
242                         start = NULL;
243                 }
244                 i++;
245         }
246
247         ref = alloc_ref("HEAD");
248         if (!http_fetch_ref(url, ref) &&
249             !resolve_remote_symref(ref, refs)) {
250                 ref->next = refs;
251                 refs = ref;
252         } else {
253                 free(ref);
254         }
255
256         return refs;
257 }
258
259 static struct ref *get_refs(int for_push)
260 {
261         struct discovery *heads;
262
263         if (for_push)
264                 heads = discover_refs("git-receive-pack");
265         else
266                 heads = discover_refs("git-upload-pack");
267
268         if (heads->proto_git)
269                 return parse_git_refs(heads);
270         return parse_info_refs(heads);
271 }
272
273 static void output_refs(struct ref *refs)
274 {
275         struct ref *posn;
276         for (posn = refs; posn; posn = posn->next) {
277                 if (posn->symref)
278                         printf("@%s %s\n", posn->symref, posn->name);
279                 else
280                         printf("%s %s\n", sha1_to_hex(posn->old_sha1), posn->name);
281         }
282         printf("\n");
283         fflush(stdout);
284         free_refs(refs);
285 }
286
287 struct rpc_state {
288         const char *service_name;
289         const char **argv;
290         char *service_url;
291         char *hdr_content_type;
292         char *hdr_accept;
293         char *buf;
294         size_t alloc;
295         size_t len;
296         size_t pos;
297         int in;
298         int out;
299         struct strbuf result;
300         unsigned gzip_request : 1;
301         unsigned initial_buffer : 1;
302 };
303
304 static size_t rpc_out(void *ptr, size_t eltsize,
305                 size_t nmemb, void *buffer_)
306 {
307         size_t max = eltsize * nmemb;
308         struct rpc_state *rpc = buffer_;
309         size_t avail = rpc->len - rpc->pos;
310
311         if (!avail) {
312                 rpc->initial_buffer = 0;
313                 avail = packet_read_line(rpc->out, rpc->buf, rpc->alloc);
314                 if (!avail)
315                         return 0;
316                 rpc->pos = 0;
317                 rpc->len = avail;
318         }
319
320         if (max < avail)
321                 avail = max;
322         memcpy(ptr, rpc->buf + rpc->pos, avail);
323         rpc->pos += avail;
324         return avail;
325 }
326
327 #ifndef NO_CURL_IOCTL
328 static curlioerr rpc_ioctl(CURL *handle, int cmd, void *clientp)
329 {
330         struct rpc_state *rpc = clientp;
331
332         switch (cmd) {
333         case CURLIOCMD_NOP:
334                 return CURLIOE_OK;
335
336         case CURLIOCMD_RESTARTREAD:
337                 if (rpc->initial_buffer) {
338                         rpc->pos = 0;
339                         return CURLIOE_OK;
340                 }
341                 fprintf(stderr, "Unable to rewind rpc post data - try increasing http.postBuffer\n");
342                 return CURLIOE_FAILRESTART;
343
344         default:
345                 return CURLIOE_UNKNOWNCMD;
346         }
347 }
348 #endif
349
350 static size_t rpc_in(const void *ptr, size_t eltsize,
351                 size_t nmemb, void *buffer_)
352 {
353         size_t size = eltsize * nmemb;
354         struct rpc_state *rpc = buffer_;
355         write_or_die(rpc->in, ptr, size);
356         return size;
357 }
358
359 static int run_slot(struct active_request_slot *slot)
360 {
361         int err = 0;
362         struct slot_results results;
363
364         slot->results = &results;
365         slot->curl_result = curl_easy_perform(slot->curl);
366         finish_active_slot(slot);
367
368         if (results.curl_result != CURLE_OK) {
369                 err |= error("RPC failed; result=%d, HTTP code = %ld",
370                         results.curl_result, results.http_code);
371         }
372
373         return err;
374 }
375
376 static int probe_rpc(struct rpc_state *rpc)
377 {
378         struct active_request_slot *slot;
379         struct curl_slist *headers = NULL;
380         struct strbuf buf = STRBUF_INIT;
381         int err;
382
383         slot = get_active_slot();
384
385         headers = curl_slist_append(headers, rpc->hdr_content_type);
386         headers = curl_slist_append(headers, rpc->hdr_accept);
387
388         curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
389         curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
390         curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
391         curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "");
392         curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, "0000");
393         curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, 4);
394         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
395         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
396         curl_easy_setopt(slot->curl, CURLOPT_FILE, &buf);
397
398         err = run_slot(slot);
399
400         curl_slist_free_all(headers);
401         strbuf_release(&buf);
402         return err;
403 }
404
405 static int post_rpc(struct rpc_state *rpc)
406 {
407         struct active_request_slot *slot;
408         struct curl_slist *headers = NULL;
409         int use_gzip = rpc->gzip_request;
410         char *gzip_body = NULL;
411         int err, large_request = 0;
412
413         /* Try to load the entire request, if we can fit it into the
414          * allocated buffer space we can use HTTP/1.0 and avoid the
415          * chunked encoding mess.
416          */
417         while (1) {
418                 size_t left = rpc->alloc - rpc->len;
419                 char *buf = rpc->buf + rpc->len;
420                 int n;
421
422                 if (left < LARGE_PACKET_MAX) {
423                         large_request = 1;
424                         use_gzip = 0;
425                         break;
426                 }
427
428                 n = packet_read_line(rpc->out, buf, left);
429                 if (!n)
430                         break;
431                 rpc->len += n;
432         }
433
434         if (large_request) {
435                 err = probe_rpc(rpc);
436                 if (err)
437                         return err;
438         }
439
440         slot = get_active_slot();
441
442         curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
443         curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
444         curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
445         curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "");
446
447         headers = curl_slist_append(headers, rpc->hdr_content_type);
448         headers = curl_slist_append(headers, rpc->hdr_accept);
449
450         if (large_request) {
451                 /* The request body is large and the size cannot be predicted.
452                  * We must use chunked encoding to send it.
453                  */
454                 headers = curl_slist_append(headers, "Expect:");
455                 headers = curl_slist_append(headers, "Transfer-Encoding: chunked");
456                 rpc->initial_buffer = 1;
457                 curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, rpc_out);
458                 curl_easy_setopt(slot->curl, CURLOPT_INFILE, rpc);
459 #ifndef NO_CURL_IOCTL
460                 curl_easy_setopt(slot->curl, CURLOPT_IOCTLFUNCTION, rpc_ioctl);
461                 curl_easy_setopt(slot->curl, CURLOPT_IOCTLDATA, rpc);
462 #endif
463                 if (options.verbosity > 1) {
464                         fprintf(stderr, "POST %s (chunked)\n", rpc->service_name);
465                         fflush(stderr);
466                 }
467
468         } else if (use_gzip && 1024 < rpc->len) {
469                 /* The client backend isn't giving us compressed data so
470                  * we can try to deflate it ourselves, this may save on.
471                  * the transfer time.
472                  */
473                 size_t size;
474                 z_stream stream;
475                 int ret;
476
477                 memset(&stream, 0, sizeof(stream));
478                 ret = deflateInit2(&stream, Z_BEST_COMPRESSION,
479                                 Z_DEFLATED, (15 + 16),
480                                 8, Z_DEFAULT_STRATEGY);
481                 if (ret != Z_OK)
482                         die("cannot deflate request; zlib init error %d", ret);
483                 size = deflateBound(&stream, rpc->len);
484                 gzip_body = xmalloc(size);
485
486                 stream.next_in = (unsigned char *)rpc->buf;
487                 stream.avail_in = rpc->len;
488                 stream.next_out = (unsigned char *)gzip_body;
489                 stream.avail_out = size;
490
491                 ret = deflate(&stream, Z_FINISH);
492                 if (ret != Z_STREAM_END)
493                         die("cannot deflate request; zlib deflate error %d", ret);
494
495                 ret = deflateEnd(&stream);
496                 if (ret != Z_OK)
497                         die("cannot deflate request; zlib end error %d", ret);
498
499                 size = stream.total_out;
500
501                 headers = curl_slist_append(headers, "Content-Encoding: gzip");
502                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);
503                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, size);
504
505                 if (options.verbosity > 1) {
506                         fprintf(stderr, "POST %s (gzip %lu to %lu bytes)\n",
507                                 rpc->service_name,
508                                 (unsigned long)rpc->len, (unsigned long)size);
509                         fflush(stderr);
510                 }
511         } else {
512                 /* We know the complete request size in advance, use the
513                  * more normal Content-Length approach.
514                  */
515                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, rpc->buf);
516                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, rpc->len);
517                 if (options.verbosity > 1) {
518                         fprintf(stderr, "POST %s (%lu bytes)\n",
519                                 rpc->service_name, (unsigned long)rpc->len);
520                         fflush(stderr);
521                 }
522         }
523
524         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
525         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, rpc_in);
526         curl_easy_setopt(slot->curl, CURLOPT_FILE, rpc);
527
528         err = run_slot(slot);
529
530         curl_slist_free_all(headers);
531         free(gzip_body);
532         return err;
533 }
534
535 static int rpc_service(struct rpc_state *rpc, struct discovery *heads)
536 {
537         const char *svc = rpc->service_name;
538         struct strbuf buf = STRBUF_INIT;
539         struct child_process client;
540         int err = 0;
541
542         memset(&client, 0, sizeof(client));
543         client.in = -1;
544         client.out = -1;
545         client.git_cmd = 1;
546         client.argv = rpc->argv;
547         if (start_command(&client))
548                 exit(1);
549         if (heads)
550                 write_or_die(client.in, heads->buf, heads->len);
551
552         rpc->alloc = http_post_buffer;
553         rpc->buf = xmalloc(rpc->alloc);
554         rpc->in = client.in;
555         rpc->out = client.out;
556         strbuf_init(&rpc->result, 0);
557
558         strbuf_addf(&buf, "%s%s", url, svc);
559         rpc->service_url = strbuf_detach(&buf, NULL);
560
561         strbuf_addf(&buf, "Content-Type: application/x-%s-request", svc);
562         rpc->hdr_content_type = strbuf_detach(&buf, NULL);
563
564         strbuf_addf(&buf, "Accept: application/x-%s-result", svc);
565         rpc->hdr_accept = strbuf_detach(&buf, NULL);
566
567         while (!err) {
568                 int n = packet_read_line(rpc->out, rpc->buf, rpc->alloc);
569                 if (!n)
570                         break;
571                 rpc->pos = 0;
572                 rpc->len = n;
573                 err |= post_rpc(rpc);
574         }
575
576         close(client.in);
577         client.in = -1;
578         strbuf_read(&rpc->result, client.out, 0);
579
580         close(client.out);
581         client.out = -1;
582
583         err |= finish_command(&client);
584         free(rpc->service_url);
585         free(rpc->hdr_content_type);
586         free(rpc->hdr_accept);
587         free(rpc->buf);
588         strbuf_release(&buf);
589         return err;
590 }
591
592 static int fetch_dumb(int nr_heads, struct ref **to_fetch)
593 {
594         struct walker *walker;
595         char **targets = xmalloc(nr_heads * sizeof(char*));
596         int ret, i;
597
598         if (options.depth)
599                 die("dumb http transport does not support --depth");
600         for (i = 0; i < nr_heads; i++)
601                 targets[i] = xstrdup(sha1_to_hex(to_fetch[i]->old_sha1));
602
603         walker = get_http_walker(url);
604         walker->get_all = 1;
605         walker->get_tree = 1;
606         walker->get_history = 1;
607         walker->get_verbosely = options.verbosity >= 3;
608         walker->get_recover = 0;
609         ret = walker_fetch(walker, nr_heads, targets, NULL, NULL);
610         walker_free(walker);
611
612         for (i = 0; i < nr_heads; i++)
613                 free(targets[i]);
614         free(targets);
615
616         return ret ? error("Fetch failed.") : 0;
617 }
618
619 static int fetch_git(struct discovery *heads,
620         int nr_heads, struct ref **to_fetch)
621 {
622         struct rpc_state rpc;
623         char *depth_arg = NULL;
624         const char **argv;
625         int argc = 0, i, err;
626
627         argv = xmalloc((15 + nr_heads) * sizeof(char*));
628         argv[argc++] = "fetch-pack";
629         argv[argc++] = "--stateless-rpc";
630         argv[argc++] = "--lock-pack";
631         if (options.followtags)
632                 argv[argc++] = "--include-tag";
633         if (options.thin)
634                 argv[argc++] = "--thin";
635         if (options.verbosity >= 3) {
636                 argv[argc++] = "-v";
637                 argv[argc++] = "-v";
638         }
639         if (!options.progress)
640                 argv[argc++] = "--no-progress";
641         if (options.depth) {
642                 struct strbuf buf = STRBUF_INIT;
643                 strbuf_addf(&buf, "--depth=%lu", options.depth);
644                 depth_arg = strbuf_detach(&buf, NULL);
645                 argv[argc++] = depth_arg;
646         }
647         argv[argc++] = url;
648         for (i = 0; i < nr_heads; i++) {
649                 struct ref *ref = to_fetch[i];
650                 if (!ref->name || !*ref->name)
651                         die("cannot fetch by sha1 over smart http");
652                 argv[argc++] = ref->name;
653         }
654         argv[argc++] = NULL;
655
656         memset(&rpc, 0, sizeof(rpc));
657         rpc.service_name = "git-upload-pack",
658         rpc.argv = argv;
659         rpc.gzip_request = 1;
660
661         err = rpc_service(&rpc, heads);
662         if (rpc.result.len)
663                 safe_write(1, rpc.result.buf, rpc.result.len);
664         strbuf_release(&rpc.result);
665         free(argv);
666         free(depth_arg);
667         return err;
668 }
669
670 static int fetch(int nr_heads, struct ref **to_fetch)
671 {
672         struct discovery *d = discover_refs("git-upload-pack");
673         if (d->proto_git)
674                 return fetch_git(d, nr_heads, to_fetch);
675         else
676                 return fetch_dumb(nr_heads, to_fetch);
677 }
678
679 static void parse_fetch(struct strbuf *buf)
680 {
681         struct ref **to_fetch = NULL;
682         struct ref *list_head = NULL;
683         struct ref **list = &list_head;
684         int alloc_heads = 0, nr_heads = 0;
685
686         do {
687                 if (!prefixcmp(buf->buf, "fetch ")) {
688                         char *p = buf->buf + strlen("fetch ");
689                         char *name;
690                         struct ref *ref;
691                         unsigned char old_sha1[20];
692
693                         if (strlen(p) < 40 || get_sha1_hex(p, old_sha1))
694                                 die("protocol error: expected sha/ref, got %s'", p);
695                         if (p[40] == ' ')
696                                 name = p + 41;
697                         else if (!p[40])
698                                 name = "";
699                         else
700                                 die("protocol error: expected sha/ref, got %s'", p);
701
702                         ref = alloc_ref(name);
703                         hashcpy(ref->old_sha1, old_sha1);
704
705                         *list = ref;
706                         list = &ref->next;
707
708                         ALLOC_GROW(to_fetch, nr_heads + 1, alloc_heads);
709                         to_fetch[nr_heads++] = ref;
710                 }
711                 else
712                         die("http transport does not support %s", buf->buf);
713
714                 strbuf_reset(buf);
715                 if (strbuf_getline(buf, stdin, '\n') == EOF)
716                         return;
717                 if (!*buf->buf)
718                         break;
719         } while (1);
720
721         if (fetch(nr_heads, to_fetch))
722                 exit(128); /* error already reported */
723         free_refs(list_head);
724         free(to_fetch);
725
726         printf("\n");
727         fflush(stdout);
728         strbuf_reset(buf);
729 }
730
731 static int push_dav(int nr_spec, char **specs)
732 {
733         const char **argv = xmalloc((10 + nr_spec) * sizeof(char*));
734         int argc = 0, i;
735
736         argv[argc++] = "http-push";
737         argv[argc++] = "--helper-status";
738         if (options.dry_run)
739                 argv[argc++] = "--dry-run";
740         if (options.verbosity > 1)
741                 argv[argc++] = "--verbose";
742         argv[argc++] = url;
743         for (i = 0; i < nr_spec; i++)
744                 argv[argc++] = specs[i];
745         argv[argc++] = NULL;
746
747         if (run_command_v_opt(argv, RUN_GIT_CMD))
748                 die("git-%s failed", argv[0]);
749         free(argv);
750         return 0;
751 }
752
753 static int push_git(struct discovery *heads, int nr_spec, char **specs)
754 {
755         struct rpc_state rpc;
756         const char **argv;
757         int argc = 0, i, err;
758
759         argv = xmalloc((10 + nr_spec) * sizeof(char*));
760         argv[argc++] = "send-pack";
761         argv[argc++] = "--stateless-rpc";
762         argv[argc++] = "--helper-status";
763         if (options.thin)
764                 argv[argc++] = "--thin";
765         if (options.dry_run)
766                 argv[argc++] = "--dry-run";
767         if (options.verbosity > 1)
768                 argv[argc++] = "--verbose";
769         argv[argc++] = url;
770         for (i = 0; i < nr_spec; i++)
771                 argv[argc++] = specs[i];
772         argv[argc++] = NULL;
773
774         memset(&rpc, 0, sizeof(rpc));
775         rpc.service_name = "git-receive-pack",
776         rpc.argv = argv;
777
778         err = rpc_service(&rpc, heads);
779         if (rpc.result.len)
780                 safe_write(1, rpc.result.buf, rpc.result.len);
781         strbuf_release(&rpc.result);
782         free(argv);
783         return err;
784 }
785
786 static int push(int nr_spec, char **specs)
787 {
788         struct discovery *heads = discover_refs("git-receive-pack");
789         int ret;
790
791         if (heads->proto_git)
792                 ret = push_git(heads, nr_spec, specs);
793         else
794                 ret = push_dav(nr_spec, specs);
795         free_discovery(heads);
796         return ret;
797 }
798
799 static void parse_push(struct strbuf *buf)
800 {
801         char **specs = NULL;
802         int alloc_spec = 0, nr_spec = 0, i;
803
804         do {
805                 if (!prefixcmp(buf->buf, "push ")) {
806                         ALLOC_GROW(specs, nr_spec + 1, alloc_spec);
807                         specs[nr_spec++] = xstrdup(buf->buf + 5);
808                 }
809                 else
810                         die("http transport does not support %s", buf->buf);
811
812                 strbuf_reset(buf);
813                 if (strbuf_getline(buf, stdin, '\n') == EOF)
814                         return;
815                 if (!*buf->buf)
816                         break;
817         } while (1);
818
819         if (push(nr_spec, specs))
820                 exit(128); /* error already reported */
821         for (i = 0; i < nr_spec; i++)
822                 free(specs[i]);
823         free(specs);
824
825         printf("\n");
826         fflush(stdout);
827 }
828
829 int main(int argc, const char **argv)
830 {
831         struct strbuf buf = STRBUF_INIT;
832         int nongit;
833
834         git_extract_argv0_path(argv[0]);
835         setup_git_directory_gently(&nongit);
836         if (argc < 2) {
837                 fprintf(stderr, "Remote needed\n");
838                 return 1;
839         }
840
841         options.verbosity = 1;
842         options.progress = !!isatty(2);
843         options.thin = 1;
844
845         remote = remote_get(argv[1]);
846
847         if (argc > 2) {
848                 end_url_with_slash(&buf, argv[2]);
849         } else {
850                 end_url_with_slash(&buf, remote->url[0]);
851         }
852
853         url = strbuf_detach(&buf, NULL);
854
855         http_init(remote);
856
857         do {
858                 if (strbuf_getline(&buf, stdin, '\n') == EOF)
859                         break;
860                 if (!prefixcmp(buf.buf, "fetch ")) {
861                         if (nongit)
862                                 die("Fetch attempted without a local repo");
863                         parse_fetch(&buf);
864
865                 } else if (!strcmp(buf.buf, "list") || !prefixcmp(buf.buf, "list ")) {
866                         int for_push = !!strstr(buf.buf + 4, "for-push");
867                         output_refs(get_refs(for_push));
868
869                 } else if (!prefixcmp(buf.buf, "push ")) {
870                         parse_push(&buf);
871
872                 } else if (!prefixcmp(buf.buf, "option ")) {
873                         char *name = buf.buf + strlen("option ");
874                         char *value = strchr(name, ' ');
875                         int result;
876
877                         if (value)
878                                 *value++ = '\0';
879                         else
880                                 value = "true";
881
882                         result = set_option(name, value);
883                         if (!result)
884                                 printf("ok\n");
885                         else if (result < 0)
886                                 printf("error invalid value\n");
887                         else
888                                 printf("unsupported\n");
889                         fflush(stdout);
890
891                 } else if (!strcmp(buf.buf, "capabilities")) {
892                         printf("fetch\n");
893                         printf("option\n");
894                         printf("push\n");
895                         printf("\n");
896                         fflush(stdout);
897                 } else {
898                         return 1;
899                 }
900                 strbuf_reset(&buf);
901         } while (1);
902
903         http_cleanup();
904
905         return 0;
906 }