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