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