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