Merge branch 'jk/diff-follow-must-take-one-pathspec' into next
[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 #include "sha1-array.h"
14
15 static struct remote *remote;
16 /* always ends with a trailing slash */
17 static struct strbuf url = STRBUF_INIT;
18
19 struct options {
20         int verbosity;
21         unsigned long depth;
22         unsigned progress : 1,
23                 check_self_contained_and_connected : 1,
24                 cloning : 1,
25                 update_shallow : 1,
26                 followtags : 1,
27                 dry_run : 1,
28                 thin : 1;
29 };
30 static struct options options;
31 static struct string_list cas_options = STRING_LIST_INIT_DUP;
32
33 static int set_option(const char *name, const char *value)
34 {
35         if (!strcmp(name, "verbosity")) {
36                 char *end;
37                 int v = strtol(value, &end, 10);
38                 if (value == end || *end)
39                         return -1;
40                 options.verbosity = v;
41                 return 0;
42         }
43         else if (!strcmp(name, "progress")) {
44                 if (!strcmp(value, "true"))
45                         options.progress = 1;
46                 else if (!strcmp(value, "false"))
47                         options.progress = 0;
48                 else
49                         return -1;
50                 return 0;
51         }
52         else if (!strcmp(name, "depth")) {
53                 char *end;
54                 unsigned long v = strtoul(value, &end, 10);
55                 if (value == end || *end)
56                         return -1;
57                 options.depth = v;
58                 return 0;
59         }
60         else if (!strcmp(name, "followtags")) {
61                 if (!strcmp(value, "true"))
62                         options.followtags = 1;
63                 else if (!strcmp(value, "false"))
64                         options.followtags = 0;
65                 else
66                         return -1;
67                 return 0;
68         }
69         else if (!strcmp(name, "dry-run")) {
70                 if (!strcmp(value, "true"))
71                         options.dry_run = 1;
72                 else if (!strcmp(value, "false"))
73                         options.dry_run = 0;
74                 else
75                         return -1;
76                 return 0;
77         }
78         else if (!strcmp(name, "check-connectivity")) {
79                 if (!strcmp(value, "true"))
80                         options.check_self_contained_and_connected = 1;
81                 else if (!strcmp(value, "false"))
82                         options.check_self_contained_and_connected = 0;
83                 else
84                         return -1;
85                 return 0;
86         }
87         else if (!strcmp(name, "cas")) {
88                 struct strbuf val = STRBUF_INIT;
89                 strbuf_addf(&val, "--" CAS_OPT_NAME "=%s", value);
90                 string_list_append(&cas_options, val.buf);
91                 strbuf_release(&val);
92                 return 0;
93         } else if (!strcmp(name, "cloning")) {
94                 if (!strcmp(value, "true"))
95                         options.cloning = 1;
96                 else if (!strcmp(value, "false"))
97                         options.cloning = 0;
98                 else
99                         return -1;
100                 return 0;
101         } else if (!strcmp(name, "update-shallow")) {
102                 if (!strcmp(value, "true"))
103                         options.update_shallow = 1;
104                 else if (!strcmp(value, "false"))
105                         options.update_shallow = 0;
106                 else
107                         return -1;
108                 return 0;
109         } else {
110                 return 1 /* unsupported */;
111         }
112 }
113
114 struct discovery {
115         const char *service;
116         char *buf_alloc;
117         char *buf;
118         size_t len;
119         struct ref *refs;
120         struct sha1_array shallow;
121         unsigned proto_git : 1;
122 };
123 static struct discovery *last_discovery;
124
125 static struct ref *parse_git_refs(struct discovery *heads, int for_push)
126 {
127         struct ref *list = NULL;
128         get_remote_heads(-1, heads->buf, heads->len, &list,
129                          for_push ? REF_NORMAL : 0, NULL, &heads->shallow);
130         return list;
131 }
132
133 static struct ref *parse_info_refs(struct discovery *heads)
134 {
135         char *data, *start, *mid;
136         char *ref_name;
137         int i = 0;
138
139         struct ref *refs = NULL;
140         struct ref *ref = NULL;
141         struct ref *last_ref = NULL;
142
143         data = heads->buf;
144         start = NULL;
145         mid = data;
146         while (i < heads->len) {
147                 if (!start) {
148                         start = &data[i];
149                 }
150                 if (data[i] == '\t')
151                         mid = &data[i];
152                 if (data[i] == '\n') {
153                         if (mid - start != 40)
154                                 die("%sinfo/refs not valid: is this a git repository?",
155                                     url.buf);
156                         data[i] = 0;
157                         ref_name = mid + 1;
158                         ref = xmalloc(sizeof(struct ref) +
159                                       strlen(ref_name) + 1);
160                         memset(ref, 0, sizeof(struct ref));
161                         strcpy(ref->name, ref_name);
162                         get_sha1_hex(start, ref->old_sha1);
163                         if (!refs)
164                                 refs = ref;
165                         if (last_ref)
166                                 last_ref->next = ref;
167                         last_ref = ref;
168                         start = NULL;
169                 }
170                 i++;
171         }
172
173         ref = alloc_ref("HEAD");
174         if (!http_fetch_ref(url.buf, ref) &&
175             !resolve_remote_symref(ref, refs)) {
176                 ref->next = refs;
177                 refs = ref;
178         } else {
179                 free(ref);
180         }
181
182         return refs;
183 }
184
185 static void free_discovery(struct discovery *d)
186 {
187         if (d) {
188                 if (d == last_discovery)
189                         last_discovery = NULL;
190                 free(d->shallow.sha1);
191                 free(d->buf_alloc);
192                 free_refs(d->refs);
193                 free(d);
194         }
195 }
196
197 static int show_http_message(struct strbuf *type, struct strbuf *msg)
198 {
199         const char *p, *eol;
200
201         /*
202          * We only show text/plain parts, as other types are likely
203          * to be ugly to look at on the user's terminal.
204          *
205          * TODO should handle "; charset=XXX", and re-encode into
206          * logoutputencoding
207          */
208         if (strcasecmp(type->buf, "text/plain"))
209                 return -1;
210
211         strbuf_trim(msg);
212         if (!msg->len)
213                 return -1;
214
215         p = msg->buf;
216         do {
217                 eol = strchrnul(p, '\n');
218                 fprintf(stderr, "remote: %.*s\n", (int)(eol - p), p);
219                 p = eol + 1;
220         } while(*eol);
221         return 0;
222 }
223
224 static struct discovery* discover_refs(const char *service, int for_push)
225 {
226         struct strbuf exp = STRBUF_INIT;
227         struct strbuf type = STRBUF_INIT;
228         struct strbuf buffer = STRBUF_INIT;
229         struct strbuf refs_url = STRBUF_INIT;
230         struct strbuf effective_url = STRBUF_INIT;
231         struct discovery *last = last_discovery;
232         int http_ret, maybe_smart = 0;
233         struct http_get_options options;
234
235         if (last && !strcmp(service, last->service))
236                 return last;
237         free_discovery(last);
238
239         strbuf_addf(&refs_url, "%sinfo/refs", url.buf);
240         if ((starts_with(url.buf, "http://") || starts_with(url.buf, "https://")) &&
241              git_env_bool("GIT_SMART_HTTP", 1)) {
242                 maybe_smart = 1;
243                 if (!strchr(url.buf, '?'))
244                         strbuf_addch(&refs_url, '?');
245                 else
246                         strbuf_addch(&refs_url, '&');
247                 strbuf_addf(&refs_url, "service=%s", service);
248         }
249
250         memset(&options, 0, sizeof(options));
251         options.content_type = &type;
252         options.effective_url = &effective_url;
253         options.base_url = &url;
254         options.no_cache = 1;
255         options.keep_error = 1;
256
257         http_ret = http_get_strbuf(refs_url.buf, &buffer, &options);
258         switch (http_ret) {
259         case HTTP_OK:
260                 break;
261         case HTTP_MISSING_TARGET:
262                 show_http_message(&type, &buffer);
263                 die("repository '%s' not found", url.buf);
264         case HTTP_NOAUTH:
265                 show_http_message(&type, &buffer);
266                 die("Authentication failed for '%s'", url.buf);
267         default:
268                 show_http_message(&type, &buffer);
269                 die("unable to access '%s': %s", url.buf, curl_errorstr);
270         }
271
272         last= xcalloc(1, sizeof(*last_discovery));
273         last->service = service;
274         last->buf_alloc = strbuf_detach(&buffer, &last->len);
275         last->buf = last->buf_alloc;
276
277         strbuf_addf(&exp, "application/x-%s-advertisement", service);
278         if (maybe_smart &&
279             (5 <= last->len && last->buf[4] == '#') &&
280             !strbuf_cmp(&exp, &type)) {
281                 char *line;
282
283                 /*
284                  * smart HTTP response; validate that the service
285                  * pkt-line matches our request.
286                  */
287                 line = packet_read_line_buf(&last->buf, &last->len, NULL);
288
289                 strbuf_reset(&exp);
290                 strbuf_addf(&exp, "# service=%s", service);
291                 if (strcmp(line, exp.buf))
292                         die("invalid server response; got '%s'", line);
293                 strbuf_release(&exp);
294
295                 /* The header can include additional metadata lines, up
296                  * until a packet flush marker.  Ignore these now, but
297                  * in the future we might start to scan them.
298                  */
299                 while (packet_read_line_buf(&last->buf, &last->len, NULL))
300                         ;
301
302                 last->proto_git = 1;
303         }
304
305         if (last->proto_git)
306                 last->refs = parse_git_refs(last, for_push);
307         else
308                 last->refs = parse_info_refs(last);
309
310         strbuf_release(&refs_url);
311         strbuf_release(&exp);
312         strbuf_release(&type);
313         strbuf_release(&effective_url);
314         strbuf_release(&buffer);
315         last_discovery = last;
316         return last;
317 }
318
319 static struct ref *get_refs(int for_push)
320 {
321         struct discovery *heads;
322
323         if (for_push)
324                 heads = discover_refs("git-receive-pack", for_push);
325         else
326                 heads = discover_refs("git-upload-pack", for_push);
327
328         return heads->refs;
329 }
330
331 static void output_refs(struct ref *refs)
332 {
333         struct ref *posn;
334         for (posn = refs; posn; posn = posn->next) {
335                 if (posn->symref)
336                         printf("@%s %s\n", posn->symref, posn->name);
337                 else
338                         printf("%s %s\n", sha1_to_hex(posn->old_sha1), posn->name);
339         }
340         printf("\n");
341         fflush(stdout);
342 }
343
344 struct rpc_state {
345         const char *service_name;
346         const char **argv;
347         struct strbuf *stdin_preamble;
348         char *service_url;
349         char *hdr_content_type;
350         char *hdr_accept;
351         char *buf;
352         size_t alloc;
353         size_t len;
354         size_t pos;
355         int in;
356         int out;
357         struct strbuf result;
358         unsigned gzip_request : 1;
359         unsigned initial_buffer : 1;
360 };
361
362 static size_t rpc_out(void *ptr, size_t eltsize,
363                 size_t nmemb, void *buffer_)
364 {
365         size_t max = eltsize * nmemb;
366         struct rpc_state *rpc = buffer_;
367         size_t avail = rpc->len - rpc->pos;
368
369         if (!avail) {
370                 rpc->initial_buffer = 0;
371                 avail = packet_read(rpc->out, NULL, NULL, rpc->buf, rpc->alloc, 0);
372                 if (!avail)
373                         return 0;
374                 rpc->pos = 0;
375                 rpc->len = avail;
376         }
377
378         if (max < avail)
379                 avail = max;
380         memcpy(ptr, rpc->buf + rpc->pos, avail);
381         rpc->pos += avail;
382         return avail;
383 }
384
385 #ifndef NO_CURL_IOCTL
386 static curlioerr rpc_ioctl(CURL *handle, int cmd, void *clientp)
387 {
388         struct rpc_state *rpc = clientp;
389
390         switch (cmd) {
391         case CURLIOCMD_NOP:
392                 return CURLIOE_OK;
393
394         case CURLIOCMD_RESTARTREAD:
395                 if (rpc->initial_buffer) {
396                         rpc->pos = 0;
397                         return CURLIOE_OK;
398                 }
399                 fprintf(stderr, "Unable to rewind rpc post data - try increasing http.postBuffer\n");
400                 return CURLIOE_FAILRESTART;
401
402         default:
403                 return CURLIOE_UNKNOWNCMD;
404         }
405 }
406 #endif
407
408 static size_t rpc_in(char *ptr, size_t eltsize,
409                 size_t nmemb, void *buffer_)
410 {
411         size_t size = eltsize * nmemb;
412         struct rpc_state *rpc = buffer_;
413         write_or_die(rpc->in, ptr, size);
414         return size;
415 }
416
417 static int run_slot(struct active_request_slot *slot,
418                     struct slot_results *results)
419 {
420         int err;
421         struct slot_results results_buf;
422
423         if (!results)
424                 results = &results_buf;
425
426         err = run_one_slot(slot, results);
427
428         if (err != HTTP_OK && err != HTTP_REAUTH) {
429                 error("RPC failed; result=%d, HTTP code = %ld",
430                       results->curl_result, results->http_code);
431         }
432
433         return err;
434 }
435
436 static int probe_rpc(struct rpc_state *rpc, struct slot_results *results)
437 {
438         struct active_request_slot *slot;
439         struct curl_slist *headers = NULL;
440         struct strbuf buf = STRBUF_INIT;
441         int err;
442
443         slot = get_active_slot();
444
445         headers = curl_slist_append(headers, rpc->hdr_content_type);
446         headers = curl_slist_append(headers, rpc->hdr_accept);
447
448         curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
449         curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
450         curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
451         curl_easy_setopt(slot->curl, CURLOPT_ENCODING, NULL);
452         curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, "0000");
453         curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, 4);
454         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
455         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
456         curl_easy_setopt(slot->curl, CURLOPT_FILE, &buf);
457
458         err = run_slot(slot, results);
459
460         curl_slist_free_all(headers);
461         strbuf_release(&buf);
462         return err;
463 }
464
465 static int post_rpc(struct rpc_state *rpc)
466 {
467         struct active_request_slot *slot;
468         struct curl_slist *headers = NULL;
469         int use_gzip = rpc->gzip_request;
470         char *gzip_body = NULL;
471         size_t gzip_size = 0;
472         int err, large_request = 0;
473         int needs_100_continue = 0;
474
475         /* Try to load the entire request, if we can fit it into the
476          * allocated buffer space we can use HTTP/1.0 and avoid the
477          * chunked encoding mess.
478          */
479         while (1) {
480                 size_t left = rpc->alloc - rpc->len;
481                 char *buf = rpc->buf + rpc->len;
482                 int n;
483
484                 if (left < LARGE_PACKET_MAX) {
485                         large_request = 1;
486                         use_gzip = 0;
487                         break;
488                 }
489
490                 n = packet_read(rpc->out, NULL, NULL, buf, left, 0);
491                 if (!n)
492                         break;
493                 rpc->len += n;
494         }
495
496         if (large_request) {
497                 struct slot_results results;
498
499                 do {
500                         err = probe_rpc(rpc, &results);
501                         if (err == HTTP_REAUTH)
502                                 credential_fill(&http_auth);
503                 } while (err == HTTP_REAUTH);
504                 if (err != HTTP_OK)
505                         return -1;
506
507                 if (results.auth_avail & CURLAUTH_GSSNEGOTIATE)
508                         needs_100_continue = 1;
509         }
510
511         headers = curl_slist_append(headers, rpc->hdr_content_type);
512         headers = curl_slist_append(headers, rpc->hdr_accept);
513         headers = curl_slist_append(headers, needs_100_continue ?
514                 "Expect: 100-continue" : "Expect:");
515
516 retry:
517         slot = get_active_slot();
518
519         curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
520         curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
521         curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
522         curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "gzip");
523
524         if (large_request) {
525                 /* The request body is large and the size cannot be predicted.
526                  * We must use chunked encoding to send it.
527                  */
528                 headers = curl_slist_append(headers, "Transfer-Encoding: chunked");
529                 rpc->initial_buffer = 1;
530                 curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, rpc_out);
531                 curl_easy_setopt(slot->curl, CURLOPT_INFILE, rpc);
532 #ifndef NO_CURL_IOCTL
533                 curl_easy_setopt(slot->curl, CURLOPT_IOCTLFUNCTION, rpc_ioctl);
534                 curl_easy_setopt(slot->curl, CURLOPT_IOCTLDATA, rpc);
535 #endif
536                 if (options.verbosity > 1) {
537                         fprintf(stderr, "POST %s (chunked)\n", rpc->service_name);
538                         fflush(stderr);
539                 }
540
541         } else if (gzip_body) {
542                 /*
543                  * If we are looping to retry authentication, then the previous
544                  * run will have set up the headers and gzip buffer already,
545                  * and we just need to send it.
546                  */
547                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);
548                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, gzip_size);
549
550         } else if (use_gzip && 1024 < rpc->len) {
551                 /* The client backend isn't giving us compressed data so
552                  * we can try to deflate it ourselves, this may save on.
553                  * the transfer time.
554                  */
555                 git_zstream stream;
556                 int ret;
557
558                 memset(&stream, 0, sizeof(stream));
559                 git_deflate_init_gzip(&stream, Z_BEST_COMPRESSION);
560                 gzip_size = git_deflate_bound(&stream, rpc->len);
561                 gzip_body = xmalloc(gzip_size);
562
563                 stream.next_in = (unsigned char *)rpc->buf;
564                 stream.avail_in = rpc->len;
565                 stream.next_out = (unsigned char *)gzip_body;
566                 stream.avail_out = gzip_size;
567
568                 ret = git_deflate(&stream, Z_FINISH);
569                 if (ret != Z_STREAM_END)
570                         die("cannot deflate request; zlib deflate error %d", ret);
571
572                 ret = git_deflate_end_gently(&stream);
573                 if (ret != Z_OK)
574                         die("cannot deflate request; zlib end error %d", ret);
575
576                 gzip_size = stream.total_out;
577
578                 headers = curl_slist_append(headers, "Content-Encoding: gzip");
579                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);
580                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, gzip_size);
581
582                 if (options.verbosity > 1) {
583                         fprintf(stderr, "POST %s (gzip %lu to %lu bytes)\n",
584                                 rpc->service_name,
585                                 (unsigned long)rpc->len, (unsigned long)gzip_size);
586                         fflush(stderr);
587                 }
588         } else {
589                 /* We know the complete request size in advance, use the
590                  * more normal Content-Length approach.
591                  */
592                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, rpc->buf);
593                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, rpc->len);
594                 if (options.verbosity > 1) {
595                         fprintf(stderr, "POST %s (%lu bytes)\n",
596                                 rpc->service_name, (unsigned long)rpc->len);
597                         fflush(stderr);
598                 }
599         }
600
601         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
602         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, rpc_in);
603         curl_easy_setopt(slot->curl, CURLOPT_FILE, rpc);
604
605         err = run_slot(slot, NULL);
606         if (err == HTTP_REAUTH && !large_request) {
607                 credential_fill(&http_auth);
608                 goto retry;
609         }
610         if (err != HTTP_OK)
611                 err = -1;
612
613         curl_slist_free_all(headers);
614         free(gzip_body);
615         return err;
616 }
617
618 static int rpc_service(struct rpc_state *rpc, struct discovery *heads)
619 {
620         const char *svc = rpc->service_name;
621         struct strbuf buf = STRBUF_INIT;
622         struct strbuf *preamble = rpc->stdin_preamble;
623         struct child_process client;
624         int err = 0;
625
626         memset(&client, 0, sizeof(client));
627         client.in = -1;
628         client.out = -1;
629         client.git_cmd = 1;
630         client.argv = rpc->argv;
631         if (start_command(&client))
632                 exit(1);
633         if (preamble)
634                 write_or_die(client.in, preamble->buf, preamble->len);
635         if (heads)
636                 write_or_die(client.in, heads->buf, heads->len);
637
638         rpc->alloc = http_post_buffer;
639         rpc->buf = xmalloc(rpc->alloc);
640         rpc->in = client.in;
641         rpc->out = client.out;
642         strbuf_init(&rpc->result, 0);
643
644         strbuf_addf(&buf, "%s%s", url.buf, svc);
645         rpc->service_url = strbuf_detach(&buf, NULL);
646
647         strbuf_addf(&buf, "Content-Type: application/x-%s-request", svc);
648         rpc->hdr_content_type = strbuf_detach(&buf, NULL);
649
650         strbuf_addf(&buf, "Accept: application/x-%s-result", svc);
651         rpc->hdr_accept = strbuf_detach(&buf, NULL);
652
653         while (!err) {
654                 int n = packet_read(rpc->out, NULL, NULL, rpc->buf, rpc->alloc, 0);
655                 if (!n)
656                         break;
657                 rpc->pos = 0;
658                 rpc->len = n;
659                 err |= post_rpc(rpc);
660         }
661
662         close(client.in);
663         client.in = -1;
664         if (!err) {
665                 strbuf_read(&rpc->result, client.out, 0);
666         } else {
667                 char buf[4096];
668                 for (;;)
669                         if (xread(client.out, buf, sizeof(buf)) <= 0)
670                                 break;
671         }
672
673         close(client.out);
674         client.out = -1;
675
676         err |= finish_command(&client);
677         free(rpc->service_url);
678         free(rpc->hdr_content_type);
679         free(rpc->hdr_accept);
680         free(rpc->buf);
681         strbuf_release(&buf);
682         return err;
683 }
684
685 static int fetch_dumb(int nr_heads, struct ref **to_fetch)
686 {
687         struct walker *walker;
688         char **targets = xmalloc(nr_heads * sizeof(char*));
689         int ret, i;
690
691         if (options.depth)
692                 die("dumb http transport does not support --depth");
693         for (i = 0; i < nr_heads; i++)
694                 targets[i] = xstrdup(sha1_to_hex(to_fetch[i]->old_sha1));
695
696         walker = get_http_walker(url.buf);
697         walker->get_all = 1;
698         walker->get_tree = 1;
699         walker->get_history = 1;
700         walker->get_verbosely = options.verbosity >= 3;
701         walker->get_recover = 0;
702         ret = walker_fetch(walker, nr_heads, targets, NULL, NULL);
703         walker_free(walker);
704
705         for (i = 0; i < nr_heads; i++)
706                 free(targets[i]);
707         free(targets);
708
709         return ret ? error("Fetch failed.") : 0;
710 }
711
712 static int fetch_git(struct discovery *heads,
713         int nr_heads, struct ref **to_fetch)
714 {
715         struct rpc_state rpc;
716         struct strbuf preamble = STRBUF_INIT;
717         char *depth_arg = NULL;
718         int argc = 0, i, err;
719         const char *argv[17];
720
721         argv[argc++] = "fetch-pack";
722         argv[argc++] = "--stateless-rpc";
723         argv[argc++] = "--stdin";
724         argv[argc++] = "--lock-pack";
725         if (options.followtags)
726                 argv[argc++] = "--include-tag";
727         if (options.thin)
728                 argv[argc++] = "--thin";
729         if (options.verbosity >= 3) {
730                 argv[argc++] = "-v";
731                 argv[argc++] = "-v";
732         }
733         if (options.check_self_contained_and_connected)
734                 argv[argc++] = "--check-self-contained-and-connected";
735         if (options.cloning)
736                 argv[argc++] = "--cloning";
737         if (options.update_shallow)
738                 argv[argc++] = "--update-shallow";
739         if (!options.progress)
740                 argv[argc++] = "--no-progress";
741         if (options.depth) {
742                 struct strbuf buf = STRBUF_INIT;
743                 strbuf_addf(&buf, "--depth=%lu", options.depth);
744                 depth_arg = strbuf_detach(&buf, NULL);
745                 argv[argc++] = depth_arg;
746         }
747         argv[argc++] = url.buf;
748         argv[argc++] = NULL;
749
750         for (i = 0; i < nr_heads; i++) {
751                 struct ref *ref = to_fetch[i];
752                 if (!ref->name || !*ref->name)
753                         die("cannot fetch by sha1 over smart http");
754                 packet_buf_write(&preamble, "%s %s\n",
755                                  sha1_to_hex(ref->old_sha1), ref->name);
756         }
757         packet_buf_flush(&preamble);
758
759         memset(&rpc, 0, sizeof(rpc));
760         rpc.service_name = "git-upload-pack",
761         rpc.argv = argv;
762         rpc.stdin_preamble = &preamble;
763         rpc.gzip_request = 1;
764
765         err = rpc_service(&rpc, heads);
766         if (rpc.result.len)
767                 write_or_die(1, rpc.result.buf, rpc.result.len);
768         strbuf_release(&rpc.result);
769         strbuf_release(&preamble);
770         free(depth_arg);
771         return err;
772 }
773
774 static int fetch(int nr_heads, struct ref **to_fetch)
775 {
776         struct discovery *d = discover_refs("git-upload-pack", 0);
777         if (d->proto_git)
778                 return fetch_git(d, nr_heads, to_fetch);
779         else
780                 return fetch_dumb(nr_heads, to_fetch);
781 }
782
783 static void parse_fetch(struct strbuf *buf)
784 {
785         struct ref **to_fetch = NULL;
786         struct ref *list_head = NULL;
787         struct ref **list = &list_head;
788         int alloc_heads = 0, nr_heads = 0;
789
790         do {
791                 if (starts_with(buf->buf, "fetch ")) {
792                         char *p = buf->buf + strlen("fetch ");
793                         char *name;
794                         struct ref *ref;
795                         unsigned char old_sha1[20];
796
797                         if (strlen(p) < 40 || get_sha1_hex(p, old_sha1))
798                                 die("protocol error: expected sha/ref, got %s'", p);
799                         if (p[40] == ' ')
800                                 name = p + 41;
801                         else if (!p[40])
802                                 name = "";
803                         else
804                                 die("protocol error: expected sha/ref, got %s'", p);
805
806                         ref = alloc_ref(name);
807                         hashcpy(ref->old_sha1, old_sha1);
808
809                         *list = ref;
810                         list = &ref->next;
811
812                         ALLOC_GROW(to_fetch, nr_heads + 1, alloc_heads);
813                         to_fetch[nr_heads++] = ref;
814                 }
815                 else
816                         die("http transport does not support %s", buf->buf);
817
818                 strbuf_reset(buf);
819                 if (strbuf_getline(buf, stdin, '\n') == EOF)
820                         return;
821                 if (!*buf->buf)
822                         break;
823         } while (1);
824
825         if (fetch(nr_heads, to_fetch))
826                 exit(128); /* error already reported */
827         free_refs(list_head);
828         free(to_fetch);
829
830         printf("\n");
831         fflush(stdout);
832         strbuf_reset(buf);
833 }
834
835 static int push_dav(int nr_spec, char **specs)
836 {
837         const char **argv = xmalloc((10 + nr_spec) * sizeof(char*));
838         int argc = 0, i;
839
840         argv[argc++] = "http-push";
841         argv[argc++] = "--helper-status";
842         if (options.dry_run)
843                 argv[argc++] = "--dry-run";
844         if (options.verbosity > 1)
845                 argv[argc++] = "--verbose";
846         argv[argc++] = url.buf;
847         for (i = 0; i < nr_spec; i++)
848                 argv[argc++] = specs[i];
849         argv[argc++] = NULL;
850
851         if (run_command_v_opt(argv, RUN_GIT_CMD))
852                 die("git-%s failed", argv[0]);
853         free(argv);
854         return 0;
855 }
856
857 static int push_git(struct discovery *heads, int nr_spec, char **specs)
858 {
859         struct rpc_state rpc;
860         int i, err;
861         struct argv_array args;
862         struct string_list_item *cas_option;
863
864         argv_array_init(&args);
865         argv_array_pushl(&args, "send-pack", "--stateless-rpc", "--helper-status",
866                          NULL);
867
868         if (options.thin)
869                 argv_array_push(&args, "--thin");
870         if (options.dry_run)
871                 argv_array_push(&args, "--dry-run");
872         if (options.verbosity == 0)
873                 argv_array_push(&args, "--quiet");
874         else if (options.verbosity > 1)
875                 argv_array_push(&args, "--verbose");
876         argv_array_push(&args, options.progress ? "--progress" : "--no-progress");
877         for_each_string_list_item(cas_option, &cas_options)
878                 argv_array_push(&args, cas_option->string);
879         argv_array_push(&args, url.buf);
880         for (i = 0; i < nr_spec; i++)
881                 argv_array_push(&args, specs[i]);
882
883         memset(&rpc, 0, sizeof(rpc));
884         rpc.service_name = "git-receive-pack",
885         rpc.argv = args.argv;
886
887         err = rpc_service(&rpc, heads);
888         if (rpc.result.len)
889                 write_or_die(1, rpc.result.buf, rpc.result.len);
890         strbuf_release(&rpc.result);
891         argv_array_clear(&args);
892         return err;
893 }
894
895 static int push(int nr_spec, char **specs)
896 {
897         struct discovery *heads = discover_refs("git-receive-pack", 1);
898         int ret;
899
900         if (heads->proto_git)
901                 ret = push_git(heads, nr_spec, specs);
902         else
903                 ret = push_dav(nr_spec, specs);
904         free_discovery(heads);
905         return ret;
906 }
907
908 static void parse_push(struct strbuf *buf)
909 {
910         char **specs = NULL;
911         int alloc_spec = 0, nr_spec = 0, i, ret;
912
913         do {
914                 if (starts_with(buf->buf, "push ")) {
915                         ALLOC_GROW(specs, nr_spec + 1, alloc_spec);
916                         specs[nr_spec++] = xstrdup(buf->buf + 5);
917                 }
918                 else
919                         die("http transport does not support %s", buf->buf);
920
921                 strbuf_reset(buf);
922                 if (strbuf_getline(buf, stdin, '\n') == EOF)
923                         goto free_specs;
924                 if (!*buf->buf)
925                         break;
926         } while (1);
927
928         ret = push(nr_spec, specs);
929         printf("\n");
930         fflush(stdout);
931
932         if (ret)
933                 exit(128); /* error already reported */
934
935  free_specs:
936         for (i = 0; i < nr_spec; i++)
937                 free(specs[i]);
938         free(specs);
939 }
940
941 int main(int argc, const char **argv)
942 {
943         struct strbuf buf = STRBUF_INIT;
944         int nongit;
945
946         git_extract_argv0_path(argv[0]);
947         setup_git_directory_gently(&nongit);
948         if (argc < 2) {
949                 fprintf(stderr, "Remote needed\n");
950                 return 1;
951         }
952
953         options.verbosity = 1;
954         options.progress = !!isatty(2);
955         options.thin = 1;
956
957         remote = remote_get(argv[1]);
958
959         if (argc > 2) {
960                 end_url_with_slash(&url, argv[2]);
961         } else {
962                 end_url_with_slash(&url, remote->url[0]);
963         }
964
965         http_init(remote, url.buf, 0);
966
967         do {
968                 if (strbuf_getline(&buf, stdin, '\n') == EOF) {
969                         if (ferror(stdin))
970                                 fprintf(stderr, "Error reading command stream\n");
971                         else
972                                 fprintf(stderr, "Unexpected end of command stream\n");
973                         return 1;
974                 }
975                 if (buf.len == 0)
976                         break;
977                 if (starts_with(buf.buf, "fetch ")) {
978                         if (nongit)
979                                 die("Fetch attempted without a local repo");
980                         parse_fetch(&buf);
981
982                 } else if (!strcmp(buf.buf, "list") || starts_with(buf.buf, "list ")) {
983                         int for_push = !!strstr(buf.buf + 4, "for-push");
984                         output_refs(get_refs(for_push));
985
986                 } else if (starts_with(buf.buf, "push ")) {
987                         parse_push(&buf);
988
989                 } else if (starts_with(buf.buf, "option ")) {
990                         char *name = buf.buf + strlen("option ");
991                         char *value = strchr(name, ' ');
992                         int result;
993
994                         if (value)
995                                 *value++ = '\0';
996                         else
997                                 value = "true";
998
999                         result = set_option(name, value);
1000                         if (!result)
1001                                 printf("ok\n");
1002                         else if (result < 0)
1003                                 printf("error invalid value\n");
1004                         else
1005                                 printf("unsupported\n");
1006                         fflush(stdout);
1007
1008                 } else if (!strcmp(buf.buf, "capabilities")) {
1009                         printf("fetch\n");
1010                         printf("option\n");
1011                         printf("push\n");
1012                         printf("check-connectivity\n");
1013                         printf("\n");
1014                         fflush(stdout);
1015                 } else {
1016                         fprintf(stderr, "Unknown command '%s'\n", buf.buf);
1017                         return 1;
1018                 }
1019                 strbuf_reset(&buf);
1020         } while (1);
1021
1022         http_cleanup();
1023
1024         return 0;
1025 }