Merge branch 'js/ident-date-fix'
[git/git.git] / remote-curl.c
1 #include "cache.h"
2 #include "config.h"
3 #include "remote.h"
4 #include "connect.h"
5 #include "strbuf.h"
6 #include "walker.h"
7 #include "http.h"
8 #include "exec-cmd.h"
9 #include "run-command.h"
10 #include "pkt-line.h"
11 #include "string-list.h"
12 #include "sideband.h"
13 #include "argv-array.h"
14 #include "credential.h"
15 #include "sha1-array.h"
16 #include "send-pack.h"
17 #include "protocol.h"
18 #include "quote.h"
19
20 static struct remote *remote;
21 /* always ends with a trailing slash */
22 static struct strbuf url = STRBUF_INIT;
23
24 struct options {
25 int verbosity;
26 unsigned long depth;
27 char *deepen_since;
28 struct string_list deepen_not;
29 struct string_list push_options;
30 char *filter;
31 unsigned progress : 1,
32 check_self_contained_and_connected : 1,
33 cloning : 1,
34 update_shallow : 1,
35 followtags : 1,
36 dry_run : 1,
37 thin : 1,
38 /* One of the SEND_PACK_PUSH_CERT_* constants. */
39 push_cert : 2,
40 deepen_relative : 1,
41 from_promisor : 1,
42 no_dependents : 1;
43 };
44 static struct options options;
45 static struct string_list cas_options = STRING_LIST_INIT_DUP;
46
47 static int set_option(const char *name, const char *value)
48 {
49 if (!strcmp(name, "verbosity")) {
50 char *end;
51 int v = strtol(value, &end, 10);
52 if (value == end || *end)
53 return -1;
54 options.verbosity = v;
55 return 0;
56 }
57 else if (!strcmp(name, "progress")) {
58 if (!strcmp(value, "true"))
59 options.progress = 1;
60 else if (!strcmp(value, "false"))
61 options.progress = 0;
62 else
63 return -1;
64 return 0;
65 }
66 else if (!strcmp(name, "depth")) {
67 char *end;
68 unsigned long v = strtoul(value, &end, 10);
69 if (value == end || *end)
70 return -1;
71 options.depth = v;
72 return 0;
73 }
74 else if (!strcmp(name, "deepen-since")) {
75 options.deepen_since = xstrdup(value);
76 return 0;
77 }
78 else if (!strcmp(name, "deepen-not")) {
79 string_list_append(&options.deepen_not, value);
80 return 0;
81 }
82 else if (!strcmp(name, "deepen-relative")) {
83 if (!strcmp(value, "true"))
84 options.deepen_relative = 1;
85 else if (!strcmp(value, "false"))
86 options.deepen_relative = 0;
87 else
88 return -1;
89 return 0;
90 }
91 else if (!strcmp(name, "followtags")) {
92 if (!strcmp(value, "true"))
93 options.followtags = 1;
94 else if (!strcmp(value, "false"))
95 options.followtags = 0;
96 else
97 return -1;
98 return 0;
99 }
100 else if (!strcmp(name, "dry-run")) {
101 if (!strcmp(value, "true"))
102 options.dry_run = 1;
103 else if (!strcmp(value, "false"))
104 options.dry_run = 0;
105 else
106 return -1;
107 return 0;
108 }
109 else if (!strcmp(name, "check-connectivity")) {
110 if (!strcmp(value, "true"))
111 options.check_self_contained_and_connected = 1;
112 else if (!strcmp(value, "false"))
113 options.check_self_contained_and_connected = 0;
114 else
115 return -1;
116 return 0;
117 }
118 else if (!strcmp(name, "cas")) {
119 struct strbuf val = STRBUF_INIT;
120 strbuf_addf(&val, "--" CAS_OPT_NAME "=%s", value);
121 string_list_append(&cas_options, val.buf);
122 strbuf_release(&val);
123 return 0;
124 } else if (!strcmp(name, "cloning")) {
125 if (!strcmp(value, "true"))
126 options.cloning = 1;
127 else if (!strcmp(value, "false"))
128 options.cloning = 0;
129 else
130 return -1;
131 return 0;
132 } else if (!strcmp(name, "update-shallow")) {
133 if (!strcmp(value, "true"))
134 options.update_shallow = 1;
135 else if (!strcmp(value, "false"))
136 options.update_shallow = 0;
137 else
138 return -1;
139 return 0;
140 } else if (!strcmp(name, "pushcert")) {
141 if (!strcmp(value, "true"))
142 options.push_cert = SEND_PACK_PUSH_CERT_ALWAYS;
143 else if (!strcmp(value, "false"))
144 options.push_cert = SEND_PACK_PUSH_CERT_NEVER;
145 else if (!strcmp(value, "if-asked"))
146 options.push_cert = SEND_PACK_PUSH_CERT_IF_ASKED;
147 else
148 return -1;
149 return 0;
150 } else if (!strcmp(name, "push-option")) {
151 if (*value != '"')
152 string_list_append(&options.push_options, value);
153 else {
154 struct strbuf unquoted = STRBUF_INIT;
155 if (unquote_c_style(&unquoted, value, NULL) < 0)
156 die("invalid quoting in push-option value");
157 string_list_append_nodup(&options.push_options,
158 strbuf_detach(&unquoted, NULL));
159 }
160 return 0;
161
162 #if LIBCURL_VERSION_NUM >= 0x070a08
163 } else if (!strcmp(name, "family")) {
164 if (!strcmp(value, "ipv4"))
165 git_curl_ipresolve = CURL_IPRESOLVE_V4;
166 else if (!strcmp(value, "ipv6"))
167 git_curl_ipresolve = CURL_IPRESOLVE_V6;
168 else if (!strcmp(value, "all"))
169 git_curl_ipresolve = CURL_IPRESOLVE_WHATEVER;
170 else
171 return -1;
172 return 0;
173 #endif /* LIBCURL_VERSION_NUM >= 0x070a08 */
174 } else if (!strcmp(name, "from-promisor")) {
175 options.from_promisor = 1;
176 return 0;
177 } else if (!strcmp(name, "no-dependents")) {
178 options.no_dependents = 1;
179 return 0;
180 } else if (!strcmp(name, "filter")) {
181 options.filter = xstrdup(value);;
182 return 0;
183 } else {
184 return 1 /* unsupported */;
185 }
186 }
187
188 struct discovery {
189 char *service;
190 char *buf_alloc;
191 char *buf;
192 size_t len;
193 struct ref *refs;
194 struct oid_array shallow;
195 enum protocol_version version;
196 unsigned proto_git : 1;
197 };
198 static struct discovery *last_discovery;
199
200 static struct ref *parse_git_refs(struct discovery *heads, int for_push)
201 {
202 struct ref *list = NULL;
203 struct packet_reader reader;
204
205 packet_reader_init(&reader, -1, heads->buf, heads->len,
206 PACKET_READ_CHOMP_NEWLINE |
207 PACKET_READ_GENTLE_ON_EOF);
208
209 heads->version = discover_version(&reader);
210 switch (heads->version) {
211 case protocol_v2:
212 /*
213 * Do nothing. This isn't a list of refs but rather a
214 * capability advertisement. Client would have run
215 * 'stateless-connect' so we'll dump this capability listing
216 * and let them request the refs themselves.
217 */
218 break;
219 case protocol_v1:
220 case protocol_v0:
221 get_remote_heads(&reader, &list, for_push ? REF_NORMAL : 0,
222 NULL, &heads->shallow);
223 break;
224 case protocol_unknown_version:
225 BUG("unknown protocol version");
226 }
227
228 return list;
229 }
230
231 static struct ref *parse_info_refs(struct discovery *heads)
232 {
233 char *data, *start, *mid;
234 char *ref_name;
235 int i = 0;
236
237 struct ref *refs = NULL;
238 struct ref *ref = NULL;
239 struct ref *last_ref = NULL;
240
241 data = heads->buf;
242 start = NULL;
243 mid = data;
244 while (i < heads->len) {
245 if (!start) {
246 start = &data[i];
247 }
248 if (data[i] == '\t')
249 mid = &data[i];
250 if (data[i] == '\n') {
251 if (mid - start != 40)
252 die("%sinfo/refs not valid: is this a git repository?",
253 url.buf);
254 data[i] = 0;
255 ref_name = mid + 1;
256 ref = alloc_ref(ref_name);
257 get_oid_hex(start, &ref->old_oid);
258 if (!refs)
259 refs = ref;
260 if (last_ref)
261 last_ref->next = ref;
262 last_ref = ref;
263 start = NULL;
264 }
265 i++;
266 }
267
268 ref = alloc_ref("HEAD");
269 if (!http_fetch_ref(url.buf, ref) &&
270 !resolve_remote_symref(ref, refs)) {
271 ref->next = refs;
272 refs = ref;
273 } else {
274 free(ref);
275 }
276
277 return refs;
278 }
279
280 static void free_discovery(struct discovery *d)
281 {
282 if (d) {
283 if (d == last_discovery)
284 last_discovery = NULL;
285 free(d->shallow.oid);
286 free(d->buf_alloc);
287 free_refs(d->refs);
288 free(d->service);
289 free(d);
290 }
291 }
292
293 static int show_http_message(struct strbuf *type, struct strbuf *charset,
294 struct strbuf *msg)
295 {
296 const char *p, *eol;
297
298 /*
299 * We only show text/plain parts, as other types are likely
300 * to be ugly to look at on the user's terminal.
301 */
302 if (strcmp(type->buf, "text/plain"))
303 return -1;
304 if (charset->len)
305 strbuf_reencode(msg, charset->buf, get_log_output_encoding());
306
307 strbuf_trim(msg);
308 if (!msg->len)
309 return -1;
310
311 p = msg->buf;
312 do {
313 eol = strchrnul(p, '\n');
314 fprintf(stderr, "remote: %.*s\n", (int)(eol - p), p);
315 p = eol + 1;
316 } while(*eol);
317 return 0;
318 }
319
320 static int get_protocol_http_header(enum protocol_version version,
321 struct strbuf *header)
322 {
323 if (version > 0) {
324 strbuf_addf(header, GIT_PROTOCOL_HEADER ": version=%d",
325 version);
326
327 return 1;
328 }
329
330 return 0;
331 }
332
333 static struct discovery *discover_refs(const char *service, int for_push)
334 {
335 struct strbuf exp = STRBUF_INIT;
336 struct strbuf type = STRBUF_INIT;
337 struct strbuf charset = STRBUF_INIT;
338 struct strbuf buffer = STRBUF_INIT;
339 struct strbuf refs_url = STRBUF_INIT;
340 struct strbuf effective_url = STRBUF_INIT;
341 struct strbuf protocol_header = STRBUF_INIT;
342 struct string_list extra_headers = STRING_LIST_INIT_DUP;
343 struct discovery *last = last_discovery;
344 int http_ret, maybe_smart = 0;
345 struct http_get_options http_options;
346 enum protocol_version version = get_protocol_version_config();
347
348 if (last && !strcmp(service, last->service))
349 return last;
350 free_discovery(last);
351
352 strbuf_addf(&refs_url, "%sinfo/refs", url.buf);
353 if ((starts_with(url.buf, "http://") || starts_with(url.buf, "https://")) &&
354 git_env_bool("GIT_SMART_HTTP", 1)) {
355 maybe_smart = 1;
356 if (!strchr(url.buf, '?'))
357 strbuf_addch(&refs_url, '?');
358 else
359 strbuf_addch(&refs_url, '&');
360 strbuf_addf(&refs_url, "service=%s", service);
361 }
362
363 /*
364 * NEEDSWORK: If we are trying to use protocol v2 and we are planning
365 * to perform a push, then fallback to v0 since the client doesn't know
366 * how to push yet using v2.
367 */
368 if (version == protocol_v2 && !strcmp("git-receive-pack", service))
369 version = protocol_v0;
370
371 /* Add the extra Git-Protocol header */
372 if (get_protocol_http_header(version, &protocol_header))
373 string_list_append(&extra_headers, protocol_header.buf);
374
375 memset(&http_options, 0, sizeof(http_options));
376 http_options.content_type = &type;
377 http_options.charset = &charset;
378 http_options.effective_url = &effective_url;
379 http_options.base_url = &url;
380 http_options.extra_headers = &extra_headers;
381 http_options.initial_request = 1;
382 http_options.no_cache = 1;
383 http_options.keep_error = 1;
384
385 http_ret = http_get_strbuf(refs_url.buf, &buffer, &http_options);
386 switch (http_ret) {
387 case HTTP_OK:
388 break;
389 case HTTP_MISSING_TARGET:
390 show_http_message(&type, &charset, &buffer);
391 die("repository '%s' not found", url.buf);
392 case HTTP_NOAUTH:
393 show_http_message(&type, &charset, &buffer);
394 die("Authentication failed for '%s'", url.buf);
395 default:
396 show_http_message(&type, &charset, &buffer);
397 die("unable to access '%s': %s", url.buf, curl_errorstr);
398 }
399
400 if (options.verbosity && !starts_with(refs_url.buf, url.buf))
401 warning(_("redirecting to %s"), url.buf);
402
403 last= xcalloc(1, sizeof(*last_discovery));
404 last->service = xstrdup(service);
405 last->buf_alloc = strbuf_detach(&buffer, &last->len);
406 last->buf = last->buf_alloc;
407
408 strbuf_addf(&exp, "application/x-%s-advertisement", service);
409 if (maybe_smart &&
410 (5 <= last->len && last->buf[4] == '#') &&
411 !strbuf_cmp(&exp, &type)) {
412 char *line;
413
414 /*
415 * smart HTTP response; validate that the service
416 * pkt-line matches our request.
417 */
418 line = packet_read_line_buf(&last->buf, &last->len, NULL);
419 if (!line)
420 die("invalid server response; expected service, got flush packet");
421
422 strbuf_reset(&exp);
423 strbuf_addf(&exp, "# service=%s", service);
424 if (strcmp(line, exp.buf))
425 die("invalid server response; got '%s'", line);
426 strbuf_release(&exp);
427
428 /* The header can include additional metadata lines, up
429 * until a packet flush marker. Ignore these now, but
430 * in the future we might start to scan them.
431 */
432 while (packet_read_line_buf(&last->buf, &last->len, NULL))
433 ;
434
435 last->proto_git = 1;
436 } else if (maybe_smart &&
437 last->len > 5 && starts_with(last->buf + 4, "version 2")) {
438 last->proto_git = 1;
439 }
440
441 if (last->proto_git)
442 last->refs = parse_git_refs(last, for_push);
443 else
444 last->refs = parse_info_refs(last);
445
446 strbuf_release(&refs_url);
447 strbuf_release(&exp);
448 strbuf_release(&type);
449 strbuf_release(&charset);
450 strbuf_release(&effective_url);
451 strbuf_release(&buffer);
452 strbuf_release(&protocol_header);
453 string_list_clear(&extra_headers, 0);
454 last_discovery = last;
455 return last;
456 }
457
458 static struct ref *get_refs(int for_push)
459 {
460 struct discovery *heads;
461
462 if (for_push)
463 heads = discover_refs("git-receive-pack", for_push);
464 else
465 heads = discover_refs("git-upload-pack", for_push);
466
467 return heads->refs;
468 }
469
470 static void output_refs(struct ref *refs)
471 {
472 struct ref *posn;
473 for (posn = refs; posn; posn = posn->next) {
474 if (posn->symref)
475 printf("@%s %s\n", posn->symref, posn->name);
476 else
477 printf("%s %s\n", oid_to_hex(&posn->old_oid), posn->name);
478 }
479 printf("\n");
480 fflush(stdout);
481 }
482
483 struct rpc_state {
484 const char *service_name;
485 const char **argv;
486 struct strbuf *stdin_preamble;
487 char *service_url;
488 char *hdr_content_type;
489 char *hdr_accept;
490 char *protocol_header;
491 char *buf;
492 size_t alloc;
493 size_t len;
494 size_t pos;
495 int in;
496 int out;
497 int any_written;
498 struct strbuf result;
499 unsigned gzip_request : 1;
500 unsigned initial_buffer : 1;
501 };
502
503 static size_t rpc_out(void *ptr, size_t eltsize,
504 size_t nmemb, void *buffer_)
505 {
506 size_t max = eltsize * nmemb;
507 struct rpc_state *rpc = buffer_;
508 size_t avail = rpc->len - rpc->pos;
509
510 if (!avail) {
511 rpc->initial_buffer = 0;
512 avail = packet_read(rpc->out, NULL, NULL, rpc->buf, rpc->alloc, 0);
513 if (!avail)
514 return 0;
515 rpc->pos = 0;
516 rpc->len = avail;
517 }
518
519 if (max < avail)
520 avail = max;
521 memcpy(ptr, rpc->buf + rpc->pos, avail);
522 rpc->pos += avail;
523 return avail;
524 }
525
526 #ifndef NO_CURL_IOCTL
527 static curlioerr rpc_ioctl(CURL *handle, int cmd, void *clientp)
528 {
529 struct rpc_state *rpc = clientp;
530
531 switch (cmd) {
532 case CURLIOCMD_NOP:
533 return CURLIOE_OK;
534
535 case CURLIOCMD_RESTARTREAD:
536 if (rpc->initial_buffer) {
537 rpc->pos = 0;
538 return CURLIOE_OK;
539 }
540 error("unable to rewind rpc post data - try increasing http.postBuffer");
541 return CURLIOE_FAILRESTART;
542
543 default:
544 return CURLIOE_UNKNOWNCMD;
545 }
546 }
547 #endif
548
549 static size_t rpc_in(char *ptr, size_t eltsize,
550 size_t nmemb, void *buffer_)
551 {
552 size_t size = eltsize * nmemb;
553 struct rpc_state *rpc = buffer_;
554 if (size)
555 rpc->any_written = 1;
556 write_or_die(rpc->in, ptr, size);
557 return size;
558 }
559
560 static int run_slot(struct active_request_slot *slot,
561 struct slot_results *results)
562 {
563 int err;
564 struct slot_results results_buf;
565
566 if (!results)
567 results = &results_buf;
568
569 err = run_one_slot(slot, results);
570
571 if (err != HTTP_OK && err != HTTP_REAUTH) {
572 struct strbuf msg = STRBUF_INIT;
573 if (results->http_code && results->http_code != 200)
574 strbuf_addf(&msg, "HTTP %ld", results->http_code);
575 if (results->curl_result != CURLE_OK) {
576 if (msg.len)
577 strbuf_addch(&msg, ' ');
578 strbuf_addf(&msg, "curl %d", results->curl_result);
579 if (curl_errorstr[0]) {
580 strbuf_addch(&msg, ' ');
581 strbuf_addstr(&msg, curl_errorstr);
582 }
583 }
584 error("RPC failed; %s", msg.buf);
585 strbuf_release(&msg);
586 }
587
588 return err;
589 }
590
591 static int probe_rpc(struct rpc_state *rpc, struct slot_results *results)
592 {
593 struct active_request_slot *slot;
594 struct curl_slist *headers = http_copy_default_headers();
595 struct strbuf buf = STRBUF_INIT;
596 int err;
597
598 slot = get_active_slot();
599
600 headers = curl_slist_append(headers, rpc->hdr_content_type);
601 headers = curl_slist_append(headers, rpc->hdr_accept);
602
603 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
604 curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
605 curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
606 curl_easy_setopt(slot->curl, CURLOPT_ENCODING, NULL);
607 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, "0000");
608 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, 4);
609 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
610 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
611 curl_easy_setopt(slot->curl, CURLOPT_FILE, &buf);
612
613 err = run_slot(slot, results);
614
615 curl_slist_free_all(headers);
616 strbuf_release(&buf);
617 return err;
618 }
619
620 static curl_off_t xcurl_off_t(ssize_t len) {
621 if (len > maximum_signed_value_of_type(curl_off_t))
622 die("cannot handle pushes this big");
623 return (curl_off_t) len;
624 }
625
626 static int post_rpc(struct rpc_state *rpc)
627 {
628 struct active_request_slot *slot;
629 struct curl_slist *headers = http_copy_default_headers();
630 int use_gzip = rpc->gzip_request;
631 char *gzip_body = NULL;
632 size_t gzip_size = 0;
633 int err, large_request = 0;
634 int needs_100_continue = 0;
635
636 /* Try to load the entire request, if we can fit it into the
637 * allocated buffer space we can use HTTP/1.0 and avoid the
638 * chunked encoding mess.
639 */
640 while (1) {
641 size_t left = rpc->alloc - rpc->len;
642 char *buf = rpc->buf + rpc->len;
643 int n;
644
645 if (left < LARGE_PACKET_MAX) {
646 large_request = 1;
647 use_gzip = 0;
648 break;
649 }
650
651 n = packet_read(rpc->out, NULL, NULL, buf, left, 0);
652 if (!n)
653 break;
654 rpc->len += n;
655 }
656
657 if (large_request) {
658 struct slot_results results;
659
660 do {
661 err = probe_rpc(rpc, &results);
662 if (err == HTTP_REAUTH)
663 credential_fill(&http_auth);
664 } while (err == HTTP_REAUTH);
665 if (err != HTTP_OK)
666 return -1;
667
668 if (results.auth_avail & CURLAUTH_GSSNEGOTIATE)
669 needs_100_continue = 1;
670 }
671
672 headers = curl_slist_append(headers, rpc->hdr_content_type);
673 headers = curl_slist_append(headers, rpc->hdr_accept);
674 headers = curl_slist_append(headers, needs_100_continue ?
675 "Expect: 100-continue" : "Expect:");
676
677 /* Add the extra Git-Protocol header */
678 if (rpc->protocol_header)
679 headers = curl_slist_append(headers, rpc->protocol_header);
680
681 retry:
682 slot = get_active_slot();
683
684 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
685 curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
686 curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
687 curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "gzip");
688
689 if (large_request) {
690 /* The request body is large and the size cannot be predicted.
691 * We must use chunked encoding to send it.
692 */
693 headers = curl_slist_append(headers, "Transfer-Encoding: chunked");
694 rpc->initial_buffer = 1;
695 curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, rpc_out);
696 curl_easy_setopt(slot->curl, CURLOPT_INFILE, rpc);
697 #ifndef NO_CURL_IOCTL
698 curl_easy_setopt(slot->curl, CURLOPT_IOCTLFUNCTION, rpc_ioctl);
699 curl_easy_setopt(slot->curl, CURLOPT_IOCTLDATA, rpc);
700 #endif
701 if (options.verbosity > 1) {
702 fprintf(stderr, "POST %s (chunked)\n", rpc->service_name);
703 fflush(stderr);
704 }
705
706 } else if (gzip_body) {
707 /*
708 * If we are looping to retry authentication, then the previous
709 * run will have set up the headers and gzip buffer already,
710 * and we just need to send it.
711 */
712 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);
713 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE_LARGE, xcurl_off_t(gzip_size));
714
715 } else if (use_gzip && 1024 < rpc->len) {
716 /* The client backend isn't giving us compressed data so
717 * we can try to deflate it ourselves, this may save on.
718 * the transfer time.
719 */
720 git_zstream stream;
721 int ret;
722
723 git_deflate_init_gzip(&stream, Z_BEST_COMPRESSION);
724 gzip_size = git_deflate_bound(&stream, rpc->len);
725 gzip_body = xmalloc(gzip_size);
726
727 stream.next_in = (unsigned char *)rpc->buf;
728 stream.avail_in = rpc->len;
729 stream.next_out = (unsigned char *)gzip_body;
730 stream.avail_out = gzip_size;
731
732 ret = git_deflate(&stream, Z_FINISH);
733 if (ret != Z_STREAM_END)
734 die("cannot deflate request; zlib deflate error %d", ret);
735
736 ret = git_deflate_end_gently(&stream);
737 if (ret != Z_OK)
738 die("cannot deflate request; zlib end error %d", ret);
739
740 gzip_size = stream.total_out;
741
742 headers = curl_slist_append(headers, "Content-Encoding: gzip");
743 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);
744 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE_LARGE, xcurl_off_t(gzip_size));
745
746 if (options.verbosity > 1) {
747 fprintf(stderr, "POST %s (gzip %lu to %lu bytes)\n",
748 rpc->service_name,
749 (unsigned long)rpc->len, (unsigned long)gzip_size);
750 fflush(stderr);
751 }
752 } else {
753 /* We know the complete request size in advance, use the
754 * more normal Content-Length approach.
755 */
756 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, rpc->buf);
757 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE_LARGE, xcurl_off_t(rpc->len));
758 if (options.verbosity > 1) {
759 fprintf(stderr, "POST %s (%lu bytes)\n",
760 rpc->service_name, (unsigned long)rpc->len);
761 fflush(stderr);
762 }
763 }
764
765 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
766 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, rpc_in);
767 curl_easy_setopt(slot->curl, CURLOPT_FILE, rpc);
768
769
770 rpc->any_written = 0;
771 err = run_slot(slot, NULL);
772 if (err == HTTP_REAUTH && !large_request) {
773 credential_fill(&http_auth);
774 goto retry;
775 }
776 if (err != HTTP_OK)
777 err = -1;
778
779 if (!rpc->any_written)
780 err = -1;
781
782 curl_slist_free_all(headers);
783 free(gzip_body);
784 return err;
785 }
786
787 static int rpc_service(struct rpc_state *rpc, struct discovery *heads)
788 {
789 const char *svc = rpc->service_name;
790 struct strbuf buf = STRBUF_INIT;
791 struct strbuf *preamble = rpc->stdin_preamble;
792 struct child_process client = CHILD_PROCESS_INIT;
793 int err = 0;
794
795 client.in = -1;
796 client.out = -1;
797 client.git_cmd = 1;
798 client.argv = rpc->argv;
799 if (start_command(&client))
800 exit(1);
801 if (preamble)
802 write_or_die(client.in, preamble->buf, preamble->len);
803 if (heads)
804 write_or_die(client.in, heads->buf, heads->len);
805
806 rpc->alloc = http_post_buffer;
807 rpc->buf = xmalloc(rpc->alloc);
808 rpc->in = client.in;
809 rpc->out = client.out;
810 strbuf_init(&rpc->result, 0);
811
812 strbuf_addf(&buf, "%s%s", url.buf, svc);
813 rpc->service_url = strbuf_detach(&buf, NULL);
814
815 strbuf_addf(&buf, "Content-Type: application/x-%s-request", svc);
816 rpc->hdr_content_type = strbuf_detach(&buf, NULL);
817
818 strbuf_addf(&buf, "Accept: application/x-%s-result", svc);
819 rpc->hdr_accept = strbuf_detach(&buf, NULL);
820
821 if (get_protocol_http_header(heads->version, &buf))
822 rpc->protocol_header = strbuf_detach(&buf, NULL);
823 else
824 rpc->protocol_header = NULL;
825
826 while (!err) {
827 int n = packet_read(rpc->out, NULL, NULL, rpc->buf, rpc->alloc, 0);
828 if (!n)
829 break;
830 rpc->pos = 0;
831 rpc->len = n;
832 err |= post_rpc(rpc);
833 }
834
835 close(client.in);
836 client.in = -1;
837 if (!err) {
838 strbuf_read(&rpc->result, client.out, 0);
839 } else {
840 char buf[4096];
841 for (;;)
842 if (xread(client.out, buf, sizeof(buf)) <= 0)
843 break;
844 }
845
846 close(client.out);
847 client.out = -1;
848
849 err |= finish_command(&client);
850 free(rpc->service_url);
851 free(rpc->hdr_content_type);
852 free(rpc->hdr_accept);
853 free(rpc->protocol_header);
854 free(rpc->buf);
855 strbuf_release(&buf);
856 return err;
857 }
858
859 static int fetch_dumb(int nr_heads, struct ref **to_fetch)
860 {
861 struct walker *walker;
862 char **targets;
863 int ret, i;
864
865 ALLOC_ARRAY(targets, nr_heads);
866 if (options.depth || options.deepen_since)
867 die("dumb http transport does not support shallow capabilities");
868 for (i = 0; i < nr_heads; i++)
869 targets[i] = xstrdup(oid_to_hex(&to_fetch[i]->old_oid));
870
871 walker = get_http_walker(url.buf);
872 walker->get_all = 1;
873 walker->get_tree = 1;
874 walker->get_history = 1;
875 walker->get_verbosely = options.verbosity >= 3;
876 walker->get_recover = 0;
877 ret = walker_fetch(walker, nr_heads, targets, NULL, NULL);
878 walker_free(walker);
879
880 for (i = 0; i < nr_heads; i++)
881 free(targets[i]);
882 free(targets);
883
884 return ret ? error("fetch failed.") : 0;
885 }
886
887 static int fetch_git(struct discovery *heads,
888 int nr_heads, struct ref **to_fetch)
889 {
890 struct rpc_state rpc;
891 struct strbuf preamble = STRBUF_INIT;
892 int i, err;
893 struct argv_array args = ARGV_ARRAY_INIT;
894
895 argv_array_pushl(&args, "fetch-pack", "--stateless-rpc",
896 "--stdin", "--lock-pack", NULL);
897 if (options.followtags)
898 argv_array_push(&args, "--include-tag");
899 if (options.thin)
900 argv_array_push(&args, "--thin");
901 if (options.verbosity >= 3)
902 argv_array_pushl(&args, "-v", "-v", NULL);
903 if (options.check_self_contained_and_connected)
904 argv_array_push(&args, "--check-self-contained-and-connected");
905 if (options.cloning)
906 argv_array_push(&args, "--cloning");
907 if (options.update_shallow)
908 argv_array_push(&args, "--update-shallow");
909 if (!options.progress)
910 argv_array_push(&args, "--no-progress");
911 if (options.depth)
912 argv_array_pushf(&args, "--depth=%lu", options.depth);
913 if (options.deepen_since)
914 argv_array_pushf(&args, "--shallow-since=%s", options.deepen_since);
915 for (i = 0; i < options.deepen_not.nr; i++)
916 argv_array_pushf(&args, "--shallow-exclude=%s",
917 options.deepen_not.items[i].string);
918 if (options.deepen_relative && options.depth)
919 argv_array_push(&args, "--deepen-relative");
920 if (options.from_promisor)
921 argv_array_push(&args, "--from-promisor");
922 if (options.no_dependents)
923 argv_array_push(&args, "--no-dependents");
924 if (options.filter)
925 argv_array_pushf(&args, "--filter=%s", options.filter);
926 argv_array_push(&args, url.buf);
927
928 for (i = 0; i < nr_heads; i++) {
929 struct ref *ref = to_fetch[i];
930 if (!*ref->name)
931 die("cannot fetch by sha1 over smart http");
932 packet_buf_write(&preamble, "%s %s\n",
933 oid_to_hex(&ref->old_oid), ref->name);
934 }
935 packet_buf_flush(&preamble);
936
937 memset(&rpc, 0, sizeof(rpc));
938 rpc.service_name = "git-upload-pack",
939 rpc.argv = args.argv;
940 rpc.stdin_preamble = &preamble;
941 rpc.gzip_request = 1;
942
943 err = rpc_service(&rpc, heads);
944 if (rpc.result.len)
945 write_or_die(1, rpc.result.buf, rpc.result.len);
946 strbuf_release(&rpc.result);
947 strbuf_release(&preamble);
948 argv_array_clear(&args);
949 return err;
950 }
951
952 static int fetch(int nr_heads, struct ref **to_fetch)
953 {
954 struct discovery *d = discover_refs("git-upload-pack", 0);
955 if (d->proto_git)
956 return fetch_git(d, nr_heads, to_fetch);
957 else
958 return fetch_dumb(nr_heads, to_fetch);
959 }
960
961 static void parse_fetch(struct strbuf *buf)
962 {
963 struct ref **to_fetch = NULL;
964 struct ref *list_head = NULL;
965 struct ref **list = &list_head;
966 int alloc_heads = 0, nr_heads = 0;
967
968 do {
969 const char *p;
970 if (skip_prefix(buf->buf, "fetch ", &p)) {
971 const char *name;
972 struct ref *ref;
973 struct object_id old_oid;
974
975 if (get_oid_hex(p, &old_oid))
976 die("protocol error: expected sha/ref, got %s'", p);
977 if (p[GIT_SHA1_HEXSZ] == ' ')
978 name = p + GIT_SHA1_HEXSZ + 1;
979 else if (!p[GIT_SHA1_HEXSZ])
980 name = "";
981 else
982 die("protocol error: expected sha/ref, got %s'", p);
983
984 ref = alloc_ref(name);
985 oidcpy(&ref->old_oid, &old_oid);
986
987 *list = ref;
988 list = &ref->next;
989
990 ALLOC_GROW(to_fetch, nr_heads + 1, alloc_heads);
991 to_fetch[nr_heads++] = ref;
992 }
993 else
994 die("http transport does not support %s", buf->buf);
995
996 strbuf_reset(buf);
997 if (strbuf_getline_lf(buf, stdin) == EOF)
998 return;
999 if (!*buf->buf)
1000 break;
1001 } while (1);
1002
1003 if (fetch(nr_heads, to_fetch))
1004 exit(128); /* error already reported */
1005 free_refs(list_head);
1006 free(to_fetch);
1007
1008 printf("\n");
1009 fflush(stdout);
1010 strbuf_reset(buf);
1011 }
1012
1013 static int push_dav(int nr_spec, char **specs)
1014 {
1015 struct child_process child = CHILD_PROCESS_INIT;
1016 size_t i;
1017
1018 child.git_cmd = 1;
1019 argv_array_push(&child.args, "http-push");
1020 argv_array_push(&child.args, "--helper-status");
1021 if (options.dry_run)
1022 argv_array_push(&child.args, "--dry-run");
1023 if (options.verbosity > 1)
1024 argv_array_push(&child.args, "--verbose");
1025 argv_array_push(&child.args, url.buf);
1026 for (i = 0; i < nr_spec; i++)
1027 argv_array_push(&child.args, specs[i]);
1028
1029 if (run_command(&child))
1030 die("git-http-push failed");
1031 return 0;
1032 }
1033
1034 static int push_git(struct discovery *heads, int nr_spec, char **specs)
1035 {
1036 struct rpc_state rpc;
1037 int i, err;
1038 struct argv_array args;
1039 struct string_list_item *cas_option;
1040 struct strbuf preamble = STRBUF_INIT;
1041
1042 argv_array_init(&args);
1043 argv_array_pushl(&args, "send-pack", "--stateless-rpc", "--helper-status",
1044 NULL);
1045
1046 if (options.thin)
1047 argv_array_push(&args, "--thin");
1048 if (options.dry_run)
1049 argv_array_push(&args, "--dry-run");
1050 if (options.push_cert == SEND_PACK_PUSH_CERT_ALWAYS)
1051 argv_array_push(&args, "--signed=yes");
1052 else if (options.push_cert == SEND_PACK_PUSH_CERT_IF_ASKED)
1053 argv_array_push(&args, "--signed=if-asked");
1054 if (options.verbosity == 0)
1055 argv_array_push(&args, "--quiet");
1056 else if (options.verbosity > 1)
1057 argv_array_push(&args, "--verbose");
1058 for (i = 0; i < options.push_options.nr; i++)
1059 argv_array_pushf(&args, "--push-option=%s",
1060 options.push_options.items[i].string);
1061 argv_array_push(&args, options.progress ? "--progress" : "--no-progress");
1062 for_each_string_list_item(cas_option, &cas_options)
1063 argv_array_push(&args, cas_option->string);
1064 argv_array_push(&args, url.buf);
1065
1066 argv_array_push(&args, "--stdin");
1067 for (i = 0; i < nr_spec; i++)
1068 packet_buf_write(&preamble, "%s\n", specs[i]);
1069 packet_buf_flush(&preamble);
1070
1071 memset(&rpc, 0, sizeof(rpc));
1072 rpc.service_name = "git-receive-pack",
1073 rpc.argv = args.argv;
1074 rpc.stdin_preamble = &preamble;
1075
1076 err = rpc_service(&rpc, heads);
1077 if (rpc.result.len)
1078 write_or_die(1, rpc.result.buf, rpc.result.len);
1079 strbuf_release(&rpc.result);
1080 strbuf_release(&preamble);
1081 argv_array_clear(&args);
1082 return err;
1083 }
1084
1085 static int push(int nr_spec, char **specs)
1086 {
1087 struct discovery *heads = discover_refs("git-receive-pack", 1);
1088 int ret;
1089
1090 if (heads->proto_git)
1091 ret = push_git(heads, nr_spec, specs);
1092 else
1093 ret = push_dav(nr_spec, specs);
1094 free_discovery(heads);
1095 return ret;
1096 }
1097
1098 static void parse_push(struct strbuf *buf)
1099 {
1100 char **specs = NULL;
1101 int alloc_spec = 0, nr_spec = 0, i, ret;
1102
1103 do {
1104 if (starts_with(buf->buf, "push ")) {
1105 ALLOC_GROW(specs, nr_spec + 1, alloc_spec);
1106 specs[nr_spec++] = xstrdup(buf->buf + 5);
1107 }
1108 else
1109 die("http transport does not support %s", buf->buf);
1110
1111 strbuf_reset(buf);
1112 if (strbuf_getline_lf(buf, stdin) == EOF)
1113 goto free_specs;
1114 if (!*buf->buf)
1115 break;
1116 } while (1);
1117
1118 ret = push(nr_spec, specs);
1119 printf("\n");
1120 fflush(stdout);
1121
1122 if (ret)
1123 exit(128); /* error already reported */
1124
1125 free_specs:
1126 for (i = 0; i < nr_spec; i++)
1127 free(specs[i]);
1128 free(specs);
1129 }
1130
1131 /*
1132 * Used to represent the state of a connection to an HTTP server when
1133 * communicating using git's wire-protocol version 2.
1134 */
1135 struct proxy_state {
1136 char *service_name;
1137 char *service_url;
1138 struct curl_slist *headers;
1139 struct strbuf request_buffer;
1140 int in;
1141 int out;
1142 struct packet_reader reader;
1143 size_t pos;
1144 int seen_flush;
1145 };
1146
1147 static void proxy_state_init(struct proxy_state *p, const char *service_name,
1148 enum protocol_version version)
1149 {
1150 struct strbuf buf = STRBUF_INIT;
1151
1152 memset(p, 0, sizeof(*p));
1153 p->service_name = xstrdup(service_name);
1154
1155 p->in = 0;
1156 p->out = 1;
1157 strbuf_init(&p->request_buffer, 0);
1158
1159 strbuf_addf(&buf, "%s%s", url.buf, p->service_name);
1160 p->service_url = strbuf_detach(&buf, NULL);
1161
1162 p->headers = http_copy_default_headers();
1163
1164 strbuf_addf(&buf, "Content-Type: application/x-%s-request", p->service_name);
1165 p->headers = curl_slist_append(p->headers, buf.buf);
1166 strbuf_reset(&buf);
1167
1168 strbuf_addf(&buf, "Accept: application/x-%s-result", p->service_name);
1169 p->headers = curl_slist_append(p->headers, buf.buf);
1170 strbuf_reset(&buf);
1171
1172 p->headers = curl_slist_append(p->headers, "Transfer-Encoding: chunked");
1173
1174 /* Add the Git-Protocol header */
1175 if (get_protocol_http_header(version, &buf))
1176 p->headers = curl_slist_append(p->headers, buf.buf);
1177
1178 packet_reader_init(&p->reader, p->in, NULL, 0,
1179 PACKET_READ_GENTLE_ON_EOF);
1180
1181 strbuf_release(&buf);
1182 }
1183
1184 static void proxy_state_clear(struct proxy_state *p)
1185 {
1186 free(p->service_name);
1187 free(p->service_url);
1188 curl_slist_free_all(p->headers);
1189 strbuf_release(&p->request_buffer);
1190 }
1191
1192 /*
1193 * CURLOPT_READFUNCTION callback function.
1194 * Attempts to copy over a single packet-line at a time into the
1195 * curl provided buffer.
1196 */
1197 static size_t proxy_in(char *buffer, size_t eltsize,
1198 size_t nmemb, void *userdata)
1199 {
1200 size_t max;
1201 struct proxy_state *p = userdata;
1202 size_t avail = p->request_buffer.len - p->pos;
1203
1204
1205 if (eltsize != 1)
1206 BUG("curl read callback called with size = %"PRIuMAX" != 1",
1207 (uintmax_t)eltsize);
1208 max = nmemb;
1209
1210 if (!avail) {
1211 if (p->seen_flush) {
1212 p->seen_flush = 0;
1213 return 0;
1214 }
1215
1216 strbuf_reset(&p->request_buffer);
1217 switch (packet_reader_read(&p->reader)) {
1218 case PACKET_READ_EOF:
1219 die("unexpected EOF when reading from parent process");
1220 case PACKET_READ_NORMAL:
1221 packet_buf_write_len(&p->request_buffer, p->reader.line,
1222 p->reader.pktlen);
1223 break;
1224 case PACKET_READ_DELIM:
1225 packet_buf_delim(&p->request_buffer);
1226 break;
1227 case PACKET_READ_FLUSH:
1228 packet_buf_flush(&p->request_buffer);
1229 p->seen_flush = 1;
1230 break;
1231 }
1232 p->pos = 0;
1233 avail = p->request_buffer.len;
1234 }
1235
1236 if (max < avail)
1237 avail = max;
1238 memcpy(buffer, p->request_buffer.buf + p->pos, avail);
1239 p->pos += avail;
1240 return avail;
1241 }
1242
1243 static size_t proxy_out(char *buffer, size_t eltsize,
1244 size_t nmemb, void *userdata)
1245 {
1246 size_t size;
1247 struct proxy_state *p = userdata;
1248
1249 if (eltsize != 1)
1250 BUG("curl read callback called with size = %"PRIuMAX" != 1",
1251 (uintmax_t)eltsize);
1252 size = nmemb;
1253
1254 write_or_die(p->out, buffer, size);
1255 return size;
1256 }
1257
1258 /* Issues a request to the HTTP server configured in `p` */
1259 static int proxy_request(struct proxy_state *p)
1260 {
1261 struct active_request_slot *slot;
1262
1263 slot = get_active_slot();
1264
1265 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
1266 curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
1267 curl_easy_setopt(slot->curl, CURLOPT_URL, p->service_url);
1268 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, p->headers);
1269
1270 /* Setup function to read request from client */
1271 curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, proxy_in);
1272 curl_easy_setopt(slot->curl, CURLOPT_READDATA, p);
1273
1274 /* Setup function to write server response to client */
1275 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, proxy_out);
1276 curl_easy_setopt(slot->curl, CURLOPT_WRITEDATA, p);
1277
1278 if (run_slot(slot, NULL) != HTTP_OK)
1279 return -1;
1280
1281 return 0;
1282 }
1283
1284 static int stateless_connect(const char *service_name)
1285 {
1286 struct discovery *discover;
1287 struct proxy_state p;
1288
1289 /*
1290 * Run the info/refs request and see if the server supports protocol
1291 * v2. If and only if the server supports v2 can we successfully
1292 * establish a stateless connection, otherwise we need to tell the
1293 * client to fallback to using other transport helper functions to
1294 * complete their request.
1295 */
1296 discover = discover_refs(service_name, 0);
1297 if (discover->version != protocol_v2) {
1298 printf("fallback\n");
1299 fflush(stdout);
1300 return -1;
1301 } else {
1302 /* Stateless Connection established */
1303 printf("\n");
1304 fflush(stdout);
1305 }
1306
1307 proxy_state_init(&p, service_name, discover->version);
1308
1309 /*
1310 * Dump the capability listing that we got from the server earlier
1311 * during the info/refs request.
1312 */
1313 write_or_die(p.out, discover->buf, discover->len);
1314
1315 /* Peek the next packet line. Until we see EOF keep sending POSTs */
1316 while (packet_reader_peek(&p.reader) != PACKET_READ_EOF) {
1317 if (proxy_request(&p)) {
1318 /* We would have an err here */
1319 break;
1320 }
1321 }
1322
1323 proxy_state_clear(&p);
1324 return 0;
1325 }
1326
1327 int cmd_main(int argc, const char **argv)
1328 {
1329 struct strbuf buf = STRBUF_INIT;
1330 int nongit;
1331
1332 setup_git_directory_gently(&nongit);
1333 if (argc < 2) {
1334 error("remote-curl: usage: git remote-curl <remote> [<url>]");
1335 return 1;
1336 }
1337
1338 options.verbosity = 1;
1339 options.progress = !!isatty(2);
1340 options.thin = 1;
1341 string_list_init(&options.deepen_not, 1);
1342 string_list_init(&options.push_options, 1);
1343
1344 remote = remote_get(argv[1]);
1345
1346 if (argc > 2) {
1347 end_url_with_slash(&url, argv[2]);
1348 } else {
1349 end_url_with_slash(&url, remote->url[0]);
1350 }
1351
1352 http_init(remote, url.buf, 0);
1353
1354 do {
1355 const char *arg;
1356
1357 if (strbuf_getline_lf(&buf, stdin) == EOF) {
1358 if (ferror(stdin))
1359 error("remote-curl: error reading command stream from git");
1360 return 1;
1361 }
1362 if (buf.len == 0)
1363 break;
1364 if (starts_with(buf.buf, "fetch ")) {
1365 if (nongit)
1366 die("remote-curl: fetch attempted without a local repo");
1367 parse_fetch(&buf);
1368
1369 } else if (!strcmp(buf.buf, "list") || starts_with(buf.buf, "list ")) {
1370 int for_push = !!strstr(buf.buf + 4, "for-push");
1371 output_refs(get_refs(for_push));
1372
1373 } else if (starts_with(buf.buf, "push ")) {
1374 parse_push(&buf);
1375
1376 } else if (skip_prefix(buf.buf, "option ", &arg)) {
1377 char *value = strchr(arg, ' ');
1378 int result;
1379
1380 if (value)
1381 *value++ = '\0';
1382 else
1383 value = "true";
1384
1385 result = set_option(arg, value);
1386 if (!result)
1387 printf("ok\n");
1388 else if (result < 0)
1389 printf("error invalid value\n");
1390 else
1391 printf("unsupported\n");
1392 fflush(stdout);
1393
1394 } else if (!strcmp(buf.buf, "capabilities")) {
1395 printf("stateless-connect\n");
1396 printf("fetch\n");
1397 printf("option\n");
1398 printf("push\n");
1399 printf("check-connectivity\n");
1400 printf("\n");
1401 fflush(stdout);
1402 } else if (skip_prefix(buf.buf, "stateless-connect ", &arg)) {
1403 if (!stateless_connect(arg))
1404 break;
1405 } else {
1406 error("remote-curl: unknown command '%s' from git", buf.buf);
1407 return 1;
1408 }
1409 strbuf_reset(&buf);
1410 } while (1);
1411
1412 http_cleanup();
1413
1414 return 0;
1415 }