Merge branch 'jk/robustify-parse-commit'
[git] / remote-curl.c
1 #include "cache.h"
2 #include "remote.h"
3 #include "strbuf.h"
4 #include "walker.h"
5 #include "http.h"
6 #include "exec_cmd.h"
7 #include "run-command.h"
8 #include "pkt-line.h"
9 #include "string-list.h"
10 #include "sideband.h"
11 #include "argv-array.h"
12 #include "credential.h"
13
14 static struct remote *remote;
15 /* always ends with a trailing slash */
16 static struct strbuf url = STRBUF_INIT;
17
18 struct options {
19         int verbosity;
20         unsigned long depth;
21         unsigned progress : 1,
22                 check_self_contained_and_connected : 1,
23                 followtags : 1,
24                 dry_run : 1,
25                 thin : 1;
26 };
27 static struct options options;
28 static struct string_list cas_options = STRING_LIST_INIT_DUP;
29
30 static int set_option(const char *name, const char *value)
31 {
32         if (!strcmp(name, "verbosity")) {
33                 char *end;
34                 int v = strtol(value, &end, 10);
35                 if (value == end || *end)
36                         return -1;
37                 options.verbosity = v;
38                 return 0;
39         }
40         else if (!strcmp(name, "progress")) {
41                 if (!strcmp(value, "true"))
42                         options.progress = 1;
43                 else if (!strcmp(value, "false"))
44                         options.progress = 0;
45                 else
46                         return -1;
47                 return 0;
48         }
49         else if (!strcmp(name, "depth")) {
50                 char *end;
51                 unsigned long v = strtoul(value, &end, 10);
52                 if (value == end || *end)
53                         return -1;
54                 options.depth = v;
55                 return 0;
56         }
57         else if (!strcmp(name, "followtags")) {
58                 if (!strcmp(value, "true"))
59                         options.followtags = 1;
60                 else if (!strcmp(value, "false"))
61                         options.followtags = 0;
62                 else
63                         return -1;
64                 return 0;
65         }
66         else if (!strcmp(name, "dry-run")) {
67                 if (!strcmp(value, "true"))
68                         options.dry_run = 1;
69                 else if (!strcmp(value, "false"))
70                         options.dry_run = 0;
71                 else
72                         return -1;
73                 return 0;
74         }
75         else if (!strcmp(name, "check-connectivity")) {
76                 if (!strcmp(value, "true"))
77                         options.check_self_contained_and_connected = 1;
78                 else if (!strcmp(value, "false"))
79                         options.check_self_contained_and_connected = 0;
80                 else
81                         return -1;
82                 return 0;
83         }
84         else if (!strcmp(name, "cas")) {
85                 struct strbuf val = STRBUF_INIT;
86                 strbuf_addf(&val, "--" CAS_OPT_NAME "=%s", value);
87                 string_list_append(&cas_options, val.buf);
88                 strbuf_release(&val);
89                 return 0;
90         }
91         else {
92                 return 1 /* unsupported */;
93         }
94 }
95
96 struct discovery {
97         const char *service;
98         char *buf_alloc;
99         char *buf;
100         size_t len;
101         struct ref *refs;
102         unsigned proto_git : 1;
103 };
104 static struct discovery *last_discovery;
105
106 static struct ref *parse_git_refs(struct discovery *heads, int for_push)
107 {
108         struct ref *list = NULL;
109         get_remote_heads(-1, heads->buf, heads->len, &list,
110                          for_push ? REF_NORMAL : 0, NULL);
111         return list;
112 }
113
114 static struct ref *parse_info_refs(struct discovery *heads)
115 {
116         char *data, *start, *mid;
117         char *ref_name;
118         int i = 0;
119
120         struct ref *refs = NULL;
121         struct ref *ref = NULL;
122         struct ref *last_ref = NULL;
123
124         data = heads->buf;
125         start = NULL;
126         mid = data;
127         while (i < heads->len) {
128                 if (!start) {
129                         start = &data[i];
130                 }
131                 if (data[i] == '\t')
132                         mid = &data[i];
133                 if (data[i] == '\n') {
134                         if (mid - start != 40)
135                                 die("%sinfo/refs not valid: is this a git repository?",
136                                     url.buf);
137                         data[i] = 0;
138                         ref_name = mid + 1;
139                         ref = xmalloc(sizeof(struct ref) +
140                                       strlen(ref_name) + 1);
141                         memset(ref, 0, sizeof(struct ref));
142                         strcpy(ref->name, ref_name);
143                         get_sha1_hex(start, ref->old_sha1);
144                         if (!refs)
145                                 refs = ref;
146                         if (last_ref)
147                                 last_ref->next = ref;
148                         last_ref = ref;
149                         start = NULL;
150                 }
151                 i++;
152         }
153
154         ref = alloc_ref("HEAD");
155         if (!http_fetch_ref(url.buf, ref) &&
156             !resolve_remote_symref(ref, refs)) {
157                 ref->next = refs;
158                 refs = ref;
159         } else {
160                 free(ref);
161         }
162
163         return refs;
164 }
165
166 static void free_discovery(struct discovery *d)
167 {
168         if (d) {
169                 if (d == last_discovery)
170                         last_discovery = NULL;
171                 free(d->buf_alloc);
172                 free_refs(d->refs);
173                 free(d);
174         }
175 }
176
177 static int show_http_message(struct strbuf *type, struct strbuf *msg)
178 {
179         const char *p, *eol;
180
181         /*
182          * We only show text/plain parts, as other types are likely
183          * to be ugly to look at on the user's terminal.
184          *
185          * TODO should handle "; charset=XXX", and re-encode into
186          * logoutputencoding
187          */
188         if (strcasecmp(type->buf, "text/plain"))
189                 return -1;
190
191         strbuf_trim(msg);
192         if (!msg->len)
193                 return -1;
194
195         p = msg->buf;
196         do {
197                 eol = strchrnul(p, '\n');
198                 fprintf(stderr, "remote: %.*s\n", (int)(eol - p), p);
199                 p = eol + 1;
200         } while(*eol);
201         return 0;
202 }
203
204 static struct discovery* discover_refs(const char *service, int for_push)
205 {
206         struct strbuf exp = STRBUF_INIT;
207         struct strbuf type = STRBUF_INIT;
208         struct strbuf buffer = STRBUF_INIT;
209         struct strbuf refs_url = STRBUF_INIT;
210         struct strbuf effective_url = STRBUF_INIT;
211         struct discovery *last = last_discovery;
212         int http_ret, maybe_smart = 0;
213         struct http_get_options options;
214
215         if (last && !strcmp(service, last->service))
216                 return last;
217         free_discovery(last);
218
219         strbuf_addf(&refs_url, "%sinfo/refs", url.buf);
220         if ((!prefixcmp(url.buf, "http://") || !prefixcmp(url.buf, "https://")) &&
221              git_env_bool("GIT_SMART_HTTP", 1)) {
222                 maybe_smart = 1;
223                 if (!strchr(url.buf, '?'))
224                         strbuf_addch(&refs_url, '?');
225                 else
226                         strbuf_addch(&refs_url, '&');
227                 strbuf_addf(&refs_url, "service=%s", service);
228         }
229
230         memset(&options, 0, sizeof(options));
231         options.content_type = &type;
232         options.effective_url = &effective_url;
233         options.base_url = &url;
234         options.no_cache = 1;
235         options.keep_error = 1;
236
237         http_ret = http_get_strbuf(refs_url.buf, &buffer, &options);
238         switch (http_ret) {
239         case HTTP_OK:
240                 break;
241         case HTTP_MISSING_TARGET:
242                 show_http_message(&type, &buffer);
243                 die("repository '%s' not found", url.buf);
244         case HTTP_NOAUTH:
245                 show_http_message(&type, &buffer);
246                 die("Authentication failed for '%s'", url.buf);
247         default:
248                 show_http_message(&type, &buffer);
249                 die("unable to access '%s': %s", url.buf, curl_errorstr);
250         }
251
252         last= xcalloc(1, sizeof(*last_discovery));
253         last->service = service;
254         last->buf_alloc = strbuf_detach(&buffer, &last->len);
255         last->buf = last->buf_alloc;
256
257         strbuf_addf(&exp, "application/x-%s-advertisement", service);
258         if (maybe_smart &&
259             (5 <= last->len && last->buf[4] == '#') &&
260             !strbuf_cmp(&exp, &type)) {
261                 char *line;
262
263                 /*
264                  * smart HTTP response; validate that the service
265                  * pkt-line matches our request.
266                  */
267                 line = packet_read_line_buf(&last->buf, &last->len, NULL);
268
269                 strbuf_reset(&exp);
270                 strbuf_addf(&exp, "# service=%s", service);
271                 if (strcmp(line, exp.buf))
272                         die("invalid server response; got '%s'", line);
273                 strbuf_release(&exp);
274
275                 /* The header can include additional metadata lines, up
276                  * until a packet flush marker.  Ignore these now, but
277                  * in the future we might start to scan them.
278                  */
279                 while (packet_read_line_buf(&last->buf, &last->len, NULL))
280                         ;
281
282                 last->proto_git = 1;
283         }
284
285         if (last->proto_git)
286                 last->refs = parse_git_refs(last, for_push);
287         else
288                 last->refs = parse_info_refs(last);
289
290         strbuf_release(&refs_url);
291         strbuf_release(&exp);
292         strbuf_release(&type);
293         strbuf_release(&effective_url);
294         strbuf_release(&buffer);
295         last_discovery = last;
296         return last;
297 }
298
299 static struct ref *get_refs(int for_push)
300 {
301         struct discovery *heads;
302
303         if (for_push)
304                 heads = discover_refs("git-receive-pack", for_push);
305         else
306                 heads = discover_refs("git-upload-pack", for_push);
307
308         return heads->refs;
309 }
310
311 static void output_refs(struct ref *refs)
312 {
313         struct ref *posn;
314         for (posn = refs; posn; posn = posn->next) {
315                 if (posn->symref)
316                         printf("@%s %s\n", posn->symref, posn->name);
317                 else
318                         printf("%s %s\n", sha1_to_hex(posn->old_sha1), posn->name);
319         }
320         printf("\n");
321         fflush(stdout);
322 }
323
324 struct rpc_state {
325         const char *service_name;
326         const char **argv;
327         struct strbuf *stdin_preamble;
328         char *service_url;
329         char *hdr_content_type;
330         char *hdr_accept;
331         char *buf;
332         size_t alloc;
333         size_t len;
334         size_t pos;
335         int in;
336         int out;
337         struct strbuf result;
338         unsigned gzip_request : 1;
339         unsigned initial_buffer : 1;
340 };
341
342 static size_t rpc_out(void *ptr, size_t eltsize,
343                 size_t nmemb, void *buffer_)
344 {
345         size_t max = eltsize * nmemb;
346         struct rpc_state *rpc = buffer_;
347         size_t avail = rpc->len - rpc->pos;
348
349         if (!avail) {
350                 rpc->initial_buffer = 0;
351                 avail = packet_read(rpc->out, NULL, NULL, rpc->buf, rpc->alloc, 0);
352                 if (!avail)
353                         return 0;
354                 rpc->pos = 0;
355                 rpc->len = avail;
356         }
357
358         if (max < avail)
359                 avail = max;
360         memcpy(ptr, rpc->buf + rpc->pos, avail);
361         rpc->pos += avail;
362         return avail;
363 }
364
365 #ifndef NO_CURL_IOCTL
366 static curlioerr rpc_ioctl(CURL *handle, int cmd, void *clientp)
367 {
368         struct rpc_state *rpc = clientp;
369
370         switch (cmd) {
371         case CURLIOCMD_NOP:
372                 return CURLIOE_OK;
373
374         case CURLIOCMD_RESTARTREAD:
375                 if (rpc->initial_buffer) {
376                         rpc->pos = 0;
377                         return CURLIOE_OK;
378                 }
379                 fprintf(stderr, "Unable to rewind rpc post data - try increasing http.postBuffer\n");
380                 return CURLIOE_FAILRESTART;
381
382         default:
383                 return CURLIOE_UNKNOWNCMD;
384         }
385 }
386 #endif
387
388 static size_t rpc_in(char *ptr, size_t eltsize,
389                 size_t nmemb, void *buffer_)
390 {
391         size_t size = eltsize * nmemb;
392         struct rpc_state *rpc = buffer_;
393         write_or_die(rpc->in, ptr, size);
394         return size;
395 }
396
397 static int run_slot(struct active_request_slot *slot)
398 {
399         int err;
400         struct slot_results results;
401
402         slot->results = &results;
403         slot->curl_result = curl_easy_perform(slot->curl);
404         finish_active_slot(slot);
405
406         err = handle_curl_result(&results);
407         if (err != HTTP_OK && err != HTTP_REAUTH) {
408                 error("RPC failed; result=%d, HTTP code = %ld",
409                       results.curl_result, results.http_code);
410         }
411
412         return err;
413 }
414
415 static int probe_rpc(struct rpc_state *rpc)
416 {
417         struct active_request_slot *slot;
418         struct curl_slist *headers = NULL;
419         struct strbuf buf = STRBUF_INIT;
420         int err;
421
422         slot = get_active_slot();
423
424         headers = curl_slist_append(headers, rpc->hdr_content_type);
425         headers = curl_slist_append(headers, rpc->hdr_accept);
426
427         curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
428         curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
429         curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
430         curl_easy_setopt(slot->curl, CURLOPT_ENCODING, NULL);
431         curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, "0000");
432         curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, 4);
433         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
434         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
435         curl_easy_setopt(slot->curl, CURLOPT_FILE, &buf);
436
437         err = run_slot(slot);
438
439         curl_slist_free_all(headers);
440         strbuf_release(&buf);
441         return err;
442 }
443
444 static int post_rpc(struct rpc_state *rpc)
445 {
446         struct active_request_slot *slot;
447         struct curl_slist *headers = NULL;
448         int use_gzip = rpc->gzip_request;
449         char *gzip_body = NULL;
450         size_t gzip_size = 0;
451         int err, large_request = 0;
452
453         /* Try to load the entire request, if we can fit it into the
454          * allocated buffer space we can use HTTP/1.0 and avoid the
455          * chunked encoding mess.
456          */
457         while (1) {
458                 size_t left = rpc->alloc - rpc->len;
459                 char *buf = rpc->buf + rpc->len;
460                 int n;
461
462                 if (left < LARGE_PACKET_MAX) {
463                         large_request = 1;
464                         use_gzip = 0;
465                         break;
466                 }
467
468                 n = packet_read(rpc->out, NULL, NULL, buf, left, 0);
469                 if (!n)
470                         break;
471                 rpc->len += n;
472         }
473
474         if (large_request) {
475                 do {
476                         err = probe_rpc(rpc);
477                         if (err == HTTP_REAUTH)
478                                 credential_fill(&http_auth);
479                 } while (err == HTTP_REAUTH);
480                 if (err != HTTP_OK)
481                         return -1;
482         }
483
484         headers = curl_slist_append(headers, rpc->hdr_content_type);
485         headers = curl_slist_append(headers, rpc->hdr_accept);
486         headers = curl_slist_append(headers, "Expect:");
487
488 retry:
489         slot = get_active_slot();
490
491         curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
492         curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
493         curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
494         curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "gzip");
495
496         if (large_request) {
497                 /* The request body is large and the size cannot be predicted.
498                  * We must use chunked encoding to send it.
499                  */
500                 headers = curl_slist_append(headers, "Transfer-Encoding: chunked");
501                 rpc->initial_buffer = 1;
502                 curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, rpc_out);
503                 curl_easy_setopt(slot->curl, CURLOPT_INFILE, rpc);
504 #ifndef NO_CURL_IOCTL
505                 curl_easy_setopt(slot->curl, CURLOPT_IOCTLFUNCTION, rpc_ioctl);
506                 curl_easy_setopt(slot->curl, CURLOPT_IOCTLDATA, rpc);
507 #endif
508                 if (options.verbosity > 1) {
509                         fprintf(stderr, "POST %s (chunked)\n", rpc->service_name);
510                         fflush(stderr);
511                 }
512
513         } else if (gzip_body) {
514                 /*
515                  * If we are looping to retry authentication, then the previous
516                  * run will have set up the headers and gzip buffer already,
517                  * and we just need to send it.
518                  */
519                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);
520                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, gzip_size);
521
522         } else if (use_gzip && 1024 < rpc->len) {
523                 /* The client backend isn't giving us compressed data so
524                  * we can try to deflate it ourselves, this may save on.
525                  * the transfer time.
526                  */
527                 git_zstream stream;
528                 int ret;
529
530                 memset(&stream, 0, sizeof(stream));
531                 git_deflate_init_gzip(&stream, Z_BEST_COMPRESSION);
532                 gzip_size = git_deflate_bound(&stream, rpc->len);
533                 gzip_body = xmalloc(gzip_size);
534
535                 stream.next_in = (unsigned char *)rpc->buf;
536                 stream.avail_in = rpc->len;
537                 stream.next_out = (unsigned char *)gzip_body;
538                 stream.avail_out = gzip_size;
539
540                 ret = git_deflate(&stream, Z_FINISH);
541                 if (ret != Z_STREAM_END)
542                         die("cannot deflate request; zlib deflate error %d", ret);
543
544                 ret = git_deflate_end_gently(&stream);
545                 if (ret != Z_OK)
546                         die("cannot deflate request; zlib end error %d", ret);
547
548                 gzip_size = stream.total_out;
549
550                 headers = curl_slist_append(headers, "Content-Encoding: gzip");
551                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);
552                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, gzip_size);
553
554                 if (options.verbosity > 1) {
555                         fprintf(stderr, "POST %s (gzip %lu to %lu bytes)\n",
556                                 rpc->service_name,
557                                 (unsigned long)rpc->len, (unsigned long)gzip_size);
558                         fflush(stderr);
559                 }
560         } else {
561                 /* We know the complete request size in advance, use the
562                  * more normal Content-Length approach.
563                  */
564                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, rpc->buf);
565                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, rpc->len);
566                 if (options.verbosity > 1) {
567                         fprintf(stderr, "POST %s (%lu bytes)\n",
568                                 rpc->service_name, (unsigned long)rpc->len);
569                         fflush(stderr);
570                 }
571         }
572
573         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
574         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, rpc_in);
575         curl_easy_setopt(slot->curl, CURLOPT_FILE, rpc);
576
577         err = run_slot(slot);
578         if (err == HTTP_REAUTH && !large_request) {
579                 credential_fill(&http_auth);
580                 goto retry;
581         }
582         if (err != HTTP_OK)
583                 err = -1;
584
585         curl_slist_free_all(headers);
586         free(gzip_body);
587         return err;
588 }
589
590 static int rpc_service(struct rpc_state *rpc, struct discovery *heads)
591 {
592         const char *svc = rpc->service_name;
593         struct strbuf buf = STRBUF_INIT;
594         struct strbuf *preamble = rpc->stdin_preamble;
595         struct child_process client;
596         int err = 0;
597
598         memset(&client, 0, sizeof(client));
599         client.in = -1;
600         client.out = -1;
601         client.git_cmd = 1;
602         client.argv = rpc->argv;
603         if (start_command(&client))
604                 exit(1);
605         if (preamble)
606                 write_or_die(client.in, preamble->buf, preamble->len);
607         if (heads)
608                 write_or_die(client.in, heads->buf, heads->len);
609
610         rpc->alloc = http_post_buffer;
611         rpc->buf = xmalloc(rpc->alloc);
612         rpc->in = client.in;
613         rpc->out = client.out;
614         strbuf_init(&rpc->result, 0);
615
616         strbuf_addf(&buf, "%s%s", url.buf, svc);
617         rpc->service_url = strbuf_detach(&buf, NULL);
618
619         strbuf_addf(&buf, "Content-Type: application/x-%s-request", svc);
620         rpc->hdr_content_type = strbuf_detach(&buf, NULL);
621
622         strbuf_addf(&buf, "Accept: application/x-%s-result", svc);
623         rpc->hdr_accept = strbuf_detach(&buf, NULL);
624
625         while (!err) {
626                 int n = packet_read(rpc->out, NULL, NULL, rpc->buf, rpc->alloc, 0);
627                 if (!n)
628                         break;
629                 rpc->pos = 0;
630                 rpc->len = n;
631                 err |= post_rpc(rpc);
632         }
633
634         close(client.in);
635         client.in = -1;
636         if (!err) {
637                 strbuf_read(&rpc->result, client.out, 0);
638         } else {
639                 char buf[4096];
640                 for (;;)
641                         if (xread(client.out, buf, sizeof(buf)) <= 0)
642                                 break;
643         }
644
645         close(client.out);
646         client.out = -1;
647
648         err |= finish_command(&client);
649         free(rpc->service_url);
650         free(rpc->hdr_content_type);
651         free(rpc->hdr_accept);
652         free(rpc->buf);
653         strbuf_release(&buf);
654         return err;
655 }
656
657 static int fetch_dumb(int nr_heads, struct ref **to_fetch)
658 {
659         struct walker *walker;
660         char **targets = xmalloc(nr_heads * sizeof(char*));
661         int ret, i;
662
663         if (options.depth)
664                 die("dumb http transport does not support --depth");
665         for (i = 0; i < nr_heads; i++)
666                 targets[i] = xstrdup(sha1_to_hex(to_fetch[i]->old_sha1));
667
668         walker = get_http_walker(url.buf);
669         walker->get_all = 1;
670         walker->get_tree = 1;
671         walker->get_history = 1;
672         walker->get_verbosely = options.verbosity >= 3;
673         walker->get_recover = 0;
674         ret = walker_fetch(walker, nr_heads, targets, NULL, NULL);
675         walker_free(walker);
676
677         for (i = 0; i < nr_heads; i++)
678                 free(targets[i]);
679         free(targets);
680
681         return ret ? error("Fetch failed.") : 0;
682 }
683
684 static int fetch_git(struct discovery *heads,
685         int nr_heads, struct ref **to_fetch)
686 {
687         struct rpc_state rpc;
688         struct strbuf preamble = STRBUF_INIT;
689         char *depth_arg = NULL;
690         int argc = 0, i, err;
691         const char *argv[16];
692
693         argv[argc++] = "fetch-pack";
694         argv[argc++] = "--stateless-rpc";
695         argv[argc++] = "--stdin";
696         argv[argc++] = "--lock-pack";
697         if (options.followtags)
698                 argv[argc++] = "--include-tag";
699         if (options.thin)
700                 argv[argc++] = "--thin";
701         if (options.verbosity >= 3) {
702                 argv[argc++] = "-v";
703                 argv[argc++] = "-v";
704         }
705         if (options.check_self_contained_and_connected)
706                 argv[argc++] = "--check-self-contained-and-connected";
707         if (!options.progress)
708                 argv[argc++] = "--no-progress";
709         if (options.depth) {
710                 struct strbuf buf = STRBUF_INIT;
711                 strbuf_addf(&buf, "--depth=%lu", options.depth);
712                 depth_arg = strbuf_detach(&buf, NULL);
713                 argv[argc++] = depth_arg;
714         }
715         argv[argc++] = url.buf;
716         argv[argc++] = NULL;
717
718         for (i = 0; i < nr_heads; i++) {
719                 struct ref *ref = to_fetch[i];
720                 if (!ref->name || !*ref->name)
721                         die("cannot fetch by sha1 over smart http");
722                 packet_buf_write(&preamble, "%s\n", ref->name);
723         }
724         packet_buf_flush(&preamble);
725
726         memset(&rpc, 0, sizeof(rpc));
727         rpc.service_name = "git-upload-pack",
728         rpc.argv = argv;
729         rpc.stdin_preamble = &preamble;
730         rpc.gzip_request = 1;
731
732         err = rpc_service(&rpc, heads);
733         if (rpc.result.len)
734                 write_or_die(1, rpc.result.buf, rpc.result.len);
735         strbuf_release(&rpc.result);
736         strbuf_release(&preamble);
737         free(depth_arg);
738         return err;
739 }
740
741 static int fetch(int nr_heads, struct ref **to_fetch)
742 {
743         struct discovery *d = discover_refs("git-upload-pack", 0);
744         if (d->proto_git)
745                 return fetch_git(d, nr_heads, to_fetch);
746         else
747                 return fetch_dumb(nr_heads, to_fetch);
748 }
749
750 static void parse_fetch(struct strbuf *buf)
751 {
752         struct ref **to_fetch = NULL;
753         struct ref *list_head = NULL;
754         struct ref **list = &list_head;
755         int alloc_heads = 0, nr_heads = 0;
756
757         do {
758                 if (!prefixcmp(buf->buf, "fetch ")) {
759                         char *p = buf->buf + strlen("fetch ");
760                         char *name;
761                         struct ref *ref;
762                         unsigned char old_sha1[20];
763
764                         if (strlen(p) < 40 || get_sha1_hex(p, old_sha1))
765                                 die("protocol error: expected sha/ref, got %s'", p);
766                         if (p[40] == ' ')
767                                 name = p + 41;
768                         else if (!p[40])
769                                 name = "";
770                         else
771                                 die("protocol error: expected sha/ref, got %s'", p);
772
773                         ref = alloc_ref(name);
774                         hashcpy(ref->old_sha1, old_sha1);
775
776                         *list = ref;
777                         list = &ref->next;
778
779                         ALLOC_GROW(to_fetch, nr_heads + 1, alloc_heads);
780                         to_fetch[nr_heads++] = ref;
781                 }
782                 else
783                         die("http transport does not support %s", buf->buf);
784
785                 strbuf_reset(buf);
786                 if (strbuf_getline(buf, stdin, '\n') == EOF)
787                         return;
788                 if (!*buf->buf)
789                         break;
790         } while (1);
791
792         if (fetch(nr_heads, to_fetch))
793                 exit(128); /* error already reported */
794         free_refs(list_head);
795         free(to_fetch);
796
797         printf("\n");
798         fflush(stdout);
799         strbuf_reset(buf);
800 }
801
802 static int push_dav(int nr_spec, char **specs)
803 {
804         const char **argv = xmalloc((10 + nr_spec) * sizeof(char*));
805         int argc = 0, i;
806
807         argv[argc++] = "http-push";
808         argv[argc++] = "--helper-status";
809         if (options.dry_run)
810                 argv[argc++] = "--dry-run";
811         if (options.verbosity > 1)
812                 argv[argc++] = "--verbose";
813         argv[argc++] = url.buf;
814         for (i = 0; i < nr_spec; i++)
815                 argv[argc++] = specs[i];
816         argv[argc++] = NULL;
817
818         if (run_command_v_opt(argv, RUN_GIT_CMD))
819                 die("git-%s failed", argv[0]);
820         free(argv);
821         return 0;
822 }
823
824 static int push_git(struct discovery *heads, int nr_spec, char **specs)
825 {
826         struct rpc_state rpc;
827         int i, err;
828         struct argv_array args;
829         struct string_list_item *cas_option;
830
831         argv_array_init(&args);
832         argv_array_pushl(&args, "send-pack", "--stateless-rpc", "--helper-status",
833                          NULL);
834
835         if (options.thin)
836                 argv_array_push(&args, "--thin");
837         if (options.dry_run)
838                 argv_array_push(&args, "--dry-run");
839         if (options.verbosity == 0)
840                 argv_array_push(&args, "--quiet");
841         else if (options.verbosity > 1)
842                 argv_array_push(&args, "--verbose");
843         argv_array_push(&args, options.progress ? "--progress" : "--no-progress");
844         for_each_string_list_item(cas_option, &cas_options)
845                 argv_array_push(&args, cas_option->string);
846         argv_array_push(&args, url.buf);
847         for (i = 0; i < nr_spec; i++)
848                 argv_array_push(&args, specs[i]);
849
850         memset(&rpc, 0, sizeof(rpc));
851         rpc.service_name = "git-receive-pack",
852         rpc.argv = args.argv;
853
854         err = rpc_service(&rpc, heads);
855         if (rpc.result.len)
856                 write_or_die(1, rpc.result.buf, rpc.result.len);
857         strbuf_release(&rpc.result);
858         argv_array_clear(&args);
859         return err;
860 }
861
862 static int push(int nr_spec, char **specs)
863 {
864         struct discovery *heads = discover_refs("git-receive-pack", 1);
865         int ret;
866
867         if (heads->proto_git)
868                 ret = push_git(heads, nr_spec, specs);
869         else
870                 ret = push_dav(nr_spec, specs);
871         free_discovery(heads);
872         return ret;
873 }
874
875 static void parse_push(struct strbuf *buf)
876 {
877         char **specs = NULL;
878         int alloc_spec = 0, nr_spec = 0, i, ret;
879
880         do {
881                 if (!prefixcmp(buf->buf, "push ")) {
882                         ALLOC_GROW(specs, nr_spec + 1, alloc_spec);
883                         specs[nr_spec++] = xstrdup(buf->buf + 5);
884                 }
885                 else
886                         die("http transport does not support %s", buf->buf);
887
888                 strbuf_reset(buf);
889                 if (strbuf_getline(buf, stdin, '\n') == EOF)
890                         goto free_specs;
891                 if (!*buf->buf)
892                         break;
893         } while (1);
894
895         ret = push(nr_spec, specs);
896         printf("\n");
897         fflush(stdout);
898
899         if (ret)
900                 exit(128); /* error already reported */
901
902  free_specs:
903         for (i = 0; i < nr_spec; i++)
904                 free(specs[i]);
905         free(specs);
906 }
907
908 int main(int argc, const char **argv)
909 {
910         struct strbuf buf = STRBUF_INIT;
911         int nongit;
912
913         git_extract_argv0_path(argv[0]);
914         setup_git_directory_gently(&nongit);
915         if (argc < 2) {
916                 fprintf(stderr, "Remote needed\n");
917                 return 1;
918         }
919
920         options.verbosity = 1;
921         options.progress = !!isatty(2);
922         options.thin = 1;
923
924         remote = remote_get(argv[1]);
925
926         if (argc > 2) {
927                 end_url_with_slash(&url, argv[2]);
928         } else {
929                 end_url_with_slash(&url, remote->url[0]);
930         }
931
932         http_init(remote, url.buf, 0);
933
934         do {
935                 if (strbuf_getline(&buf, stdin, '\n') == EOF) {
936                         if (ferror(stdin))
937                                 fprintf(stderr, "Error reading command stream\n");
938                         else
939                                 fprintf(stderr, "Unexpected end of command stream\n");
940                         return 1;
941                 }
942                 if (buf.len == 0)
943                         break;
944                 if (!prefixcmp(buf.buf, "fetch ")) {
945                         if (nongit)
946                                 die("Fetch attempted without a local repo");
947                         parse_fetch(&buf);
948
949                 } else if (!strcmp(buf.buf, "list") || !prefixcmp(buf.buf, "list ")) {
950                         int for_push = !!strstr(buf.buf + 4, "for-push");
951                         output_refs(get_refs(for_push));
952
953                 } else if (!prefixcmp(buf.buf, "push ")) {
954                         parse_push(&buf);
955
956                 } else if (!prefixcmp(buf.buf, "option ")) {
957                         char *name = buf.buf + strlen("option ");
958                         char *value = strchr(name, ' ');
959                         int result;
960
961                         if (value)
962                                 *value++ = '\0';
963                         else
964                                 value = "true";
965
966                         result = set_option(name, value);
967                         if (!result)
968                                 printf("ok\n");
969                         else if (result < 0)
970                                 printf("error invalid value\n");
971                         else
972                                 printf("unsupported\n");
973                         fflush(stdout);
974
975                 } else if (!strcmp(buf.buf, "capabilities")) {
976                         printf("fetch\n");
977                         printf("option\n");
978                         printf("push\n");
979                         printf("check-connectivity\n");
980                         printf("\n");
981                         fflush(stdout);
982                 } else {
983                         fprintf(stderr, "Unknown command '%s'\n", buf.buf);
984                         return 1;
985                 }
986                 strbuf_reset(&buf);
987         } while (1);
988
989         http_cleanup();
990
991         return 0;
992 }