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refs/reftable: precompute prefix length
[alt-git.git] / remote-curl.c
blob1161dc7fed689259141ae2eb5403d84b906027d3
1 #include "git-compat-util.h"
2 #include "config.h"
3 #include "environment.h"
4 #include "gettext.h"
5 #include "hex.h"
6 #include "remote.h"
7 #include "connect.h"
8 #include "strbuf.h"
9 #include "walker.h"
10 #include "http.h"
11 #include "run-command.h"
12 #include "pkt-line.h"
13 #include "string-list.h"
14 #include "strvec.h"
15 #include "credential.h"
16 #include "oid-array.h"
17 #include "send-pack.h"
18 #include "setup.h"
19 #include "protocol.h"
20 #include "quote.h"
21 #include "trace2.h"
22 #include "transport.h"
23 #include "url.h"
24 #include "write-or-die.h"
25
26 static struct remote *remote;
27 /* always ends with a trailing slash */
28 static struct strbuf url = STRBUF_INIT;
29
30 struct options {
31 int verbosity;
32 unsigned long depth;
33 char *deepen_since;
34 struct string_list deepen_not;
35 struct string_list push_options;
36 char *filter;
37 unsigned progress : 1,
38 check_self_contained_and_connected : 1,
39 cloning : 1,
40 update_shallow : 1,
41 followtags : 1,
42 dry_run : 1,
43 thin : 1,
44 /* One of the SEND_PACK_PUSH_CERT_* constants. */
45 push_cert : 2,
46 deepen_relative : 1,
47
48 /* see documentation of corresponding flag in fetch-pack.h */
49 from_promisor : 1,
50
51 refetch : 1,
52 atomic : 1,
53 object_format : 1,
54 force_if_includes : 1;
55 const struct git_hash_algo *hash_algo;
56 };
57 static struct options options;
58 static struct string_list cas_options = STRING_LIST_INIT_DUP;
59
60 static int set_option(const char *name, const char *value)
61 {
62 if (!strcmp(name, "verbosity")) {
63 char *end;
64 int v = strtol(value, &end, 10);
65 if (value == end || *end)
66 return -1;
67 options.verbosity = v;
68 return 0;
69 }
70 else if (!strcmp(name, "progress")) {
71 if (!strcmp(value, "true"))
72 options.progress = 1;
73 else if (!strcmp(value, "false"))
74 options.progress = 0;
75 else
76 return -1;
77 return 0;
78 }
79 else if (!strcmp(name, "depth")) {
80 char *end;
81 unsigned long v = strtoul(value, &end, 10);
82 if (value == end || *end)
83 return -1;
84 options.depth = v;
85 return 0;
86 }
87 else if (!strcmp(name, "deepen-since")) {
88 options.deepen_since = xstrdup(value);
89 return 0;
90 }
91 else if (!strcmp(name, "deepen-not")) {
92 string_list_append(&options.deepen_not, value);
93 return 0;
94 }
95 else if (!strcmp(name, "deepen-relative")) {
96 if (!strcmp(value, "true"))
97 options.deepen_relative = 1;
98 else if (!strcmp(value, "false"))
99 options.deepen_relative = 0;
100 else
101 return -1;
102 return 0;
103 }
104 else if (!strcmp(name, "followtags")) {
105 if (!strcmp(value, "true"))
106 options.followtags = 1;
107 else if (!strcmp(value, "false"))
108 options.followtags = 0;
109 else
110 return -1;
111 return 0;
112 }
113 else if (!strcmp(name, "dry-run")) {
114 if (!strcmp(value, "true"))
115 options.dry_run = 1;
116 else if (!strcmp(value, "false"))
117 options.dry_run = 0;
118 else
119 return -1;
120 return 0;
121 }
122 else if (!strcmp(name, "check-connectivity")) {
123 if (!strcmp(value, "true"))
124 options.check_self_contained_and_connected = 1;
125 else if (!strcmp(value, "false"))
126 options.check_self_contained_and_connected = 0;
127 else
128 return -1;
129 return 0;
130 }
131 else if (!strcmp(name, "cas")) {
132 struct strbuf val = STRBUF_INIT;
133 strbuf_addstr(&val, "--force-with-lease=");
134 if (*value != '"')
135 strbuf_addstr(&val, value);
136 else if (unquote_c_style(&val, value, NULL))
137 return -1;
138 string_list_append(&cas_options, val.buf);
139 strbuf_release(&val);
140 return 0;
141 } else if (!strcmp(name, TRANS_OPT_FORCE_IF_INCLUDES)) {
142 if (!strcmp(value, "true"))
143 options.force_if_includes = 1;
144 else if (!strcmp(value, "false"))
145 options.force_if_includes = 0;
146 else
147 return -1;
148 return 0;
149 } else if (!strcmp(name, "cloning")) {
150 if (!strcmp(value, "true"))
151 options.cloning = 1;
152 else if (!strcmp(value, "false"))
153 options.cloning = 0;
154 else
155 return -1;
156 return 0;
157 } else if (!strcmp(name, "update-shallow")) {
158 if (!strcmp(value, "true"))
159 options.update_shallow = 1;
160 else if (!strcmp(value, "false"))
161 options.update_shallow = 0;
162 else
163 return -1;
164 return 0;
165 } else if (!strcmp(name, "pushcert")) {
166 if (!strcmp(value, "true"))
167 options.push_cert = SEND_PACK_PUSH_CERT_ALWAYS;
168 else if (!strcmp(value, "false"))
169 options.push_cert = SEND_PACK_PUSH_CERT_NEVER;
170 else if (!strcmp(value, "if-asked"))
171 options.push_cert = SEND_PACK_PUSH_CERT_IF_ASKED;
172 else
173 return -1;
174 return 0;
175 } else if (!strcmp(name, "atomic")) {
176 if (!strcmp(value, "true"))
177 options.atomic = 1;
178 else if (!strcmp(value, "false"))
179 options.atomic = 0;
180 else
181 return -1;
182 return 0;
183 } else if (!strcmp(name, "push-option")) {
184 if (*value != '"')
185 string_list_append(&options.push_options, value);
186 else {
187 struct strbuf unquoted = STRBUF_INIT;
188 if (unquote_c_style(&unquoted, value, NULL) < 0)
189 die(_("invalid quoting in push-option value: '%s'"), value);
190 string_list_append_nodup(&options.push_options,
191 strbuf_detach(&unquoted, NULL));
192 }
193 return 0;
194 } else if (!strcmp(name, "family")) {
195 if (!strcmp(value, "ipv4"))
196 git_curl_ipresolve = CURL_IPRESOLVE_V4;
197 else if (!strcmp(value, "ipv6"))
198 git_curl_ipresolve = CURL_IPRESOLVE_V6;
199 else if (!strcmp(value, "all"))
200 git_curl_ipresolve = CURL_IPRESOLVE_WHATEVER;
201 else
202 return -1;
203 return 0;
204 } else if (!strcmp(name, "from-promisor")) {
205 options.from_promisor = 1;
206 return 0;
207 } else if (!strcmp(name, "refetch")) {
208 options.refetch = 1;
209 return 0;
210 } else if (!strcmp(name, "filter")) {
211 options.filter = xstrdup(value);
212 return 0;
213 } else if (!strcmp(name, "object-format")) {
214 int algo;
215 options.object_format = 1;
216 if (strcmp(value, "true")) {
217 algo = hash_algo_by_name(value);
218 if (algo == GIT_HASH_UNKNOWN)
219 die("unknown object format '%s'", value);
220 options.hash_algo = &hash_algos[algo];
221 }
222 return 0;
223 } else {
224 return 1 /* unsupported */;
225 }
226 }
227
228 struct discovery {
229 char *service;
230 char *buf_alloc;
231 char *buf;
232 size_t len;
233 struct ref *refs;
234 struct oid_array shallow;
235 enum protocol_version version;
236 unsigned proto_git : 1;
237 };
238 static struct discovery *last_discovery;
239
240 static struct ref *parse_git_refs(struct discovery *heads, int for_push)
241 {
242 struct ref *list = NULL;
243 struct packet_reader reader;
244
245 packet_reader_init(&reader, -1, heads->buf, heads->len,
246 PACKET_READ_CHOMP_NEWLINE |
247 PACKET_READ_GENTLE_ON_EOF |
248 PACKET_READ_DIE_ON_ERR_PACKET);
249
250 heads->version = discover_version(&reader);
251 switch (heads->version) {
252 case protocol_v2:
253 /*
254 * Do nothing. This isn't a list of refs but rather a
255 * capability advertisement. Client would have run
256 * 'stateless-connect' so we'll dump this capability listing
257 * and let them request the refs themselves.
258 */
259 break;
260 case protocol_v1:
261 case protocol_v0:
262 get_remote_heads(&reader, &list, for_push ? REF_NORMAL : 0,
263 NULL, &heads->shallow);
264 options.hash_algo = reader.hash_algo;
265 break;
266 case protocol_unknown_version:
267 BUG("unknown protocol version");
268 }
269
270 return list;
271 }
272
273 static const struct git_hash_algo *detect_hash_algo(struct discovery *heads)
274 {
275 const char *p = memchr(heads->buf, '\t', heads->len);
276 int algo;
277 if (!p)
278 return the_hash_algo;
279
280 algo = hash_algo_by_length((p - heads->buf) / 2);
281 if (algo == GIT_HASH_UNKNOWN)
282 return NULL;
283 return &hash_algos[algo];
284 }
285
286 static struct ref *parse_info_refs(struct discovery *heads)
287 {
288 char *data, *start, *mid;
289 char *ref_name;
290 int i = 0;
291
292 struct ref *refs = NULL;
293 struct ref *ref = NULL;
294 struct ref *last_ref = NULL;
295
296 options.hash_algo = detect_hash_algo(heads);
297 if (!options.hash_algo)
298 die("%sinfo/refs not valid: could not determine hash algorithm; "
299 "is this a git repository?",
300 transport_anonymize_url(url.buf));
301
302 data = heads->buf;
303 start = NULL;
304 mid = data;
305 while (i < heads->len) {
306 if (!start) {
307 start = &data[i];
308 }
309 if (data[i] == '\t')
310 mid = &data[i];
311 if (data[i] == '\n') {
312 if (mid - start != options.hash_algo->hexsz)
313 die(_("%sinfo/refs not valid: is this a git repository?"),
314 transport_anonymize_url(url.buf));
315 data[i] = 0;
316 ref_name = mid + 1;
317 ref = alloc_ref(ref_name);
318 get_oid_hex_algop(start, &ref->old_oid, options.hash_algo);
319 if (!refs)
320 refs = ref;
321 if (last_ref)
322 last_ref->next = ref;
323 last_ref = ref;
324 start = NULL;
325 }
326 i++;
327 }
328
329 ref = alloc_ref("HEAD");
330 if (!http_fetch_ref(url.buf, ref) &&
331 !resolve_remote_symref(ref, refs)) {
332 ref->next = refs;
333 refs = ref;
334 } else {
335 free(ref);
336 }
337
338 return refs;
339 }
340
341 static void free_discovery(struct discovery *d)
342 {
343 if (d) {
344 if (d == last_discovery)
345 last_discovery = NULL;
346 free(d->shallow.oid);
347 free(d->buf_alloc);
348 free_refs(d->refs);
349 free(d->service);
350 free(d);
351 }
352 }
353
354 static int show_http_message(struct strbuf *type, struct strbuf *charset,
355 struct strbuf *msg)
356 {
357 const char *p, *eol;
358
359 /*
360 * We only show text/plain parts, as other types are likely
361 * to be ugly to look at on the user's terminal.
362 */
363 if (strcmp(type->buf, "text/plain"))
364 return -1;
365 if (charset->len)
366 strbuf_reencode(msg, charset->buf, get_log_output_encoding());
367
368 strbuf_trim(msg);
369 if (!msg->len)
370 return -1;
371
372 p = msg->buf;
373 do {
374 eol = strchrnul(p, '\n');
375 fprintf(stderr, "remote: %.*s\n", (int)(eol - p), p);
376 p = eol + 1;
377 } while(*eol);
378 return 0;
379 }
380
381 static int get_protocol_http_header(enum protocol_version version,
382 struct strbuf *header)
383 {
384 if (version > 0) {
385 strbuf_addf(header, GIT_PROTOCOL_HEADER ": version=%d",
386 version);
387
388 return 1;
389 }
390
391 return 0;
392 }
393
394 static void check_smart_http(struct discovery *d, const char *service,
395 struct strbuf *type)
396 {
397 const char *p;
398 struct packet_reader reader;
399
400 /*
401 * If we don't see x-$service-advertisement, then it's not smart-http.
402 * But once we do, we commit to it and assume any other protocol
403 * violations are hard errors.
404 */
405 if (!skip_prefix(type->buf, "application/x-", &p) ||
406 !skip_prefix(p, service, &p) ||
407 strcmp(p, "-advertisement"))
408 return;
409
410 packet_reader_init(&reader, -1, d->buf, d->len,
411 PACKET_READ_CHOMP_NEWLINE |
412 PACKET_READ_DIE_ON_ERR_PACKET);
413 if (packet_reader_read(&reader) != PACKET_READ_NORMAL)
414 die(_("invalid server response; expected service, got flush packet"));
415
416 if (skip_prefix(reader.line, "# service=", &p) && !strcmp(p, service)) {
417 /*
418 * The header can include additional metadata lines, up
419 * until a packet flush marker. Ignore these now, but
420 * in the future we might start to scan them.
421 */
422 for (;;) {
423 packet_reader_read(&reader);
424 if (reader.pktlen <= 0) {
425 break;
426 }
427 }
428
429 /*
430 * v0 smart http; callers expect us to soak up the
431 * service and header packets
432 */
433 d->buf = reader.src_buffer;
434 d->len = reader.src_len;
435 d->proto_git = 1;
436
437 } else if (!strcmp(reader.line, "version 2")) {
438 /*
439 * v2 smart http; do not consume version packet, which will
440 * be handled elsewhere.
441 */
442 d->proto_git = 1;
443
444 } else {
445 die(_("invalid server response; got '%s'"), reader.line);
446 }
447 }
448
449 static struct discovery *discover_refs(const char *service, int for_push)
450 {
451 struct strbuf type = STRBUF_INIT;
452 struct strbuf charset = STRBUF_INIT;
453 struct strbuf buffer = STRBUF_INIT;
454 struct strbuf refs_url = STRBUF_INIT;
455 struct strbuf effective_url = STRBUF_INIT;
456 struct strbuf protocol_header = STRBUF_INIT;
457 struct string_list extra_headers = STRING_LIST_INIT_DUP;
458 struct discovery *last = last_discovery;
459 int http_ret, maybe_smart = 0;
460 struct http_get_options http_options;
461 enum protocol_version version = get_protocol_version_config();
462
463 if (last && !strcmp(service, last->service))
464 return last;
465 free_discovery(last);
466
467 strbuf_addf(&refs_url, "%sinfo/refs", url.buf);
468 if ((starts_with(url.buf, "http://") || starts_with(url.buf, "https://")) &&
469 git_env_bool("GIT_SMART_HTTP", 1)) {
470 maybe_smart = 1;
471 if (!strchr(url.buf, '?'))
472 strbuf_addch(&refs_url, '?');
473 else
474 strbuf_addch(&refs_url, '&');
475 strbuf_addf(&refs_url, "service=%s", service);
476 }
477
478 /*
479 * NEEDSWORK: If we are trying to use protocol v2 and we are planning
480 * to perform any operation that doesn't involve upload-pack (i.e., a
481 * fetch, ls-remote, etc), then fallback to v0 since we don't know how
482 * to do anything else (like push or remote archive) via v2.
483 */
484 if (version == protocol_v2 && strcmp("git-upload-pack", service))
485 version = protocol_v0;
486
487 /* Add the extra Git-Protocol header */
488 if (get_protocol_http_header(version, &protocol_header))
489 string_list_append(&extra_headers, protocol_header.buf);
490
491 memset(&http_options, 0, sizeof(http_options));
492 http_options.content_type = &type;
493 http_options.charset = &charset;
494 http_options.effective_url = &effective_url;
495 http_options.base_url = &url;
496 http_options.extra_headers = &extra_headers;
497 http_options.initial_request = 1;
498 http_options.no_cache = 1;
499
500 http_ret = http_get_strbuf(refs_url.buf, &buffer, &http_options);
501 switch (http_ret) {
502 case HTTP_OK:
503 break;
504 case HTTP_MISSING_TARGET:
505 show_http_message(&type, &charset, &buffer);
506 die(_("repository '%s' not found"),
507 transport_anonymize_url(url.buf));
508 case HTTP_NOAUTH:
509 show_http_message(&type, &charset, &buffer);
510 die(_("Authentication failed for '%s'"),
511 transport_anonymize_url(url.buf));
512 case HTTP_NOMATCHPUBLICKEY:
513 show_http_message(&type, &charset, &buffer);
514 die(_("unable to access '%s' with http.pinnedPubkey configuration: %s"),
515 transport_anonymize_url(url.buf), curl_errorstr);
516 default:
517 show_http_message(&type, &charset, &buffer);
518 die(_("unable to access '%s': %s"),
519 transport_anonymize_url(url.buf), curl_errorstr);
520 }
521
522 if (options.verbosity && !starts_with(refs_url.buf, url.buf)) {
523 char *u = transport_anonymize_url(url.buf);
524 warning(_("redirecting to %s"), u);
525 free(u);
526 }
527
528 last= xcalloc(1, sizeof(*last_discovery));
529 last->service = xstrdup(service);
530 last->buf_alloc = strbuf_detach(&buffer, &last->len);
531 last->buf = last->buf_alloc;
532
533 if (maybe_smart)
534 check_smart_http(last, service, &type);
535
536 if (last->proto_git)
537 last->refs = parse_git_refs(last, for_push);
538 else
539 last->refs = parse_info_refs(last);
540
541 strbuf_release(&refs_url);
542 strbuf_release(&type);
543 strbuf_release(&charset);
544 strbuf_release(&effective_url);
545 strbuf_release(&buffer);
546 strbuf_release(&protocol_header);
547 string_list_clear(&extra_headers, 0);
548 last_discovery = last;
549 return last;
550 }
551
552 static struct ref *get_refs(int for_push)
553 {
554 struct discovery *heads;
555
556 if (for_push)
557 heads = discover_refs("git-receive-pack", for_push);
558 else
559 heads = discover_refs("git-upload-pack", for_push);
560
561 return heads->refs;
562 }
563
564 static void output_refs(struct ref *refs)
565 {
566 struct ref *posn;
567 if (options.object_format && options.hash_algo) {
568 printf(":object-format %s\n", options.hash_algo->name);
569 repo_set_hash_algo(the_repository,
570 hash_algo_by_ptr(options.hash_algo));
571 }
572 for (posn = refs; posn; posn = posn->next) {
573 if (posn->symref)
574 printf("@%s %s\n", posn->symref, posn->name);
575 else
576 printf("%s %s\n", hash_to_hex_algop(posn->old_oid.hash,
577 options.hash_algo),
578 posn->name);
579 }
580 printf("\n");
581 fflush(stdout);
582 }
583
584 struct rpc_state {
585 const char *service_name;
586 char *service_url;
587 char *hdr_content_type;
588 char *hdr_accept;
589 char *hdr_accept_language;
590 char *protocol_header;
591 char *buf;
592 size_t alloc;
593 size_t len;
594 size_t pos;
595 int in;
596 int out;
597 int any_written;
598 unsigned gzip_request : 1;
599 unsigned initial_buffer : 1;
600
601 /*
602 * Whenever a pkt-line is read into buf, append the 4 characters
603 * denoting its length before appending the payload.
604 */
605 unsigned write_line_lengths : 1;
606
607 /*
608 * Used by rpc_out; initialize to 0. This is true if a flush has been
609 * read, but the corresponding line length (if write_line_lengths is
610 * true) and EOF have not been sent to libcurl. Since each flush marks
611 * the end of a request, each flush must be completely sent before any
612 * further reading occurs.
613 */
614 unsigned flush_read_but_not_sent : 1;
615 };
616
617 #define RPC_STATE_INIT { 0 }
618
619 /*
620 * Appends the result of reading from rpc->out to the string represented by
621 * rpc->buf and rpc->len if there is enough space. Returns 1 if there was
622 * enough space, 0 otherwise.
623 *
624 * If rpc->write_line_lengths is true, appends the line length as a 4-byte
625 * hexadecimal string before appending the result described above.
626 *
627 * Writes the total number of bytes appended into appended.
628 */
629 static int rpc_read_from_out(struct rpc_state *rpc, int options,
630 size_t *appended,
631 enum packet_read_status *status) {
632 size_t left;
633 char *buf;
634 int pktlen_raw;
635
636 if (rpc->write_line_lengths) {
637 left = rpc->alloc - rpc->len - 4;
638 buf = rpc->buf + rpc->len + 4;
639 } else {
640 left = rpc->alloc - rpc->len;
641 buf = rpc->buf + rpc->len;
642 }
643
644 if (left < LARGE_PACKET_MAX)
645 return 0;
646
647 *status = packet_read_with_status(rpc->out, NULL, NULL, buf,
648 left, &pktlen_raw, options);
649 if (*status != PACKET_READ_EOF) {
650 *appended = pktlen_raw + (rpc->write_line_lengths ? 4 : 0);
651 rpc->len += *appended;
652 }
653
654 if (rpc->write_line_lengths) {
655 switch (*status) {
656 case PACKET_READ_EOF:
657 if (!(options & PACKET_READ_GENTLE_ON_EOF))
658 die(_("shouldn't have EOF when not gentle on EOF"));
659 break;
660 case PACKET_READ_NORMAL:
661 set_packet_header(buf - 4, *appended);
662 break;
663 case PACKET_READ_DELIM:
664 memcpy(buf - 4, "0001", 4);
665 break;
666 case PACKET_READ_FLUSH:
667 memcpy(buf - 4, "0000", 4);
668 break;
669 case PACKET_READ_RESPONSE_END:
670 die(_("remote server sent unexpected response end packet"));
671 }
672 }
673
674 return 1;
675 }
676
677 static size_t rpc_out(void *ptr, size_t eltsize,
678 size_t nmemb, void *buffer_)
679 {
680 size_t max = eltsize * nmemb;
681 struct rpc_state *rpc = buffer_;
682 size_t avail = rpc->len - rpc->pos;
683 enum packet_read_status status;
684
685 if (!avail) {
686 rpc->initial_buffer = 0;
687 rpc->len = 0;
688 rpc->pos = 0;
689 if (!rpc->flush_read_but_not_sent) {
690 if (!rpc_read_from_out(rpc, 0, &avail, &status))
691 BUG("The entire rpc->buf should be larger than LARGE_PACKET_MAX");
692 if (status == PACKET_READ_FLUSH)
693 rpc->flush_read_but_not_sent = 1;
694 }
695 /*
696 * If flush_read_but_not_sent is true, we have already read one
697 * full request but have not fully sent it + EOF, which is why
698 * we need to refrain from reading.
699 */
700 }
701 if (rpc->flush_read_but_not_sent) {
702 if (!avail) {
703 /*
704 * The line length either does not need to be sent at
705 * all or has already been completely sent. Now we can
706 * return 0, indicating EOF, meaning that the flush has
707 * been fully sent.
708 */
709 rpc->flush_read_but_not_sent = 0;
710 return 0;
711 }
712 /*
713 * If avail is non-zero, the line length for the flush still
714 * hasn't been fully sent. Proceed with sending the line
715 * length.
716 */
717 }
718
719 if (max < avail)
720 avail = max;
721 memcpy(ptr, rpc->buf + rpc->pos, avail);
722 rpc->pos += avail;
723 return avail;
724 }
725
726 static int rpc_seek(void *clientp, curl_off_t offset, int origin)
727 {
728 struct rpc_state *rpc = clientp;
729
730 if (origin != SEEK_SET)
731 BUG("rpc_seek only handles SEEK_SET, not %d", origin);
732
733 if (rpc->initial_buffer) {
734 if (offset < 0 || offset > rpc->len) {
735 error("curl seek would be outside of rpc buffer");
736 return CURL_SEEKFUNC_FAIL;
737 }
738 rpc->pos = offset;
739 return CURL_SEEKFUNC_OK;
740 }
741 error(_("unable to rewind rpc post data - try increasing http.postBuffer"));
742 return CURL_SEEKFUNC_FAIL;
743 }
744
745 struct check_pktline_state {
746 char len_buf[4];
747 int len_filled;
748 int remaining;
749 };
750
751 static void check_pktline(struct check_pktline_state *state, const char *ptr, size_t size)
752 {
753 while (size) {
754 if (!state->remaining) {
755 int digits_remaining = 4 - state->len_filled;
756 if (digits_remaining > size)
757 digits_remaining = size;
758 memcpy(&state->len_buf[state->len_filled], ptr, digits_remaining);
759 state->len_filled += digits_remaining;
760 ptr += digits_remaining;
761 size -= digits_remaining;
762
763 if (state->len_filled == 4) {
764 state->remaining = packet_length(state->len_buf,
765 sizeof(state->len_buf));
766 if (state->remaining < 0) {
767 die(_("remote-curl: bad line length character: %.4s"), state->len_buf);
768 } else if (state->remaining == 2) {
769 die(_("remote-curl: unexpected response end packet"));
770 } else if (state->remaining < 4) {
771 state->remaining = 0;
772 } else {
773 state->remaining -= 4;
774 }
775 state->len_filled = 0;
776 }
777 }
778
779 if (state->remaining) {
780 int remaining = state->remaining;
781 if (remaining > size)
782 remaining = size;
783 ptr += remaining;
784 size -= remaining;
785 state->remaining -= remaining;
786 }
787 }
788 }
789
790 struct rpc_in_data {
791 struct rpc_state *rpc;
792 struct active_request_slot *slot;
793 int check_pktline;
794 struct check_pktline_state pktline_state;
795 };
796
797 /*
798 * A callback for CURLOPT_WRITEFUNCTION. The return value is the bytes consumed
799 * from ptr.
800 */
801 static size_t rpc_in(char *ptr, size_t eltsize,
802 size_t nmemb, void *buffer_)
803 {
804 size_t size = eltsize * nmemb;
805 struct rpc_in_data *data = buffer_;
806 long response_code;
807
808 if (curl_easy_getinfo(data->slot->curl, CURLINFO_RESPONSE_CODE,
809 &response_code) != CURLE_OK)
810 return size;
811 if (response_code >= 300)
812 return size;
813 if (size)
814 data->rpc->any_written = 1;
815 if (data->check_pktline)
816 check_pktline(&data->pktline_state, ptr, size);
817 write_or_die(data->rpc->in, ptr, size);
818 return size;
819 }
820
821 static int run_slot(struct active_request_slot *slot,
822 struct slot_results *results)
823 {
824 int err;
825 struct slot_results results_buf;
826
827 if (!results)
828 results = &results_buf;
829
830 err = run_one_slot(slot, results);
831
832 if (err != HTTP_OK && err != HTTP_REAUTH) {
833 struct strbuf msg = STRBUF_INIT;
834 if (results->http_code && results->http_code != 200)
835 strbuf_addf(&msg, "HTTP %ld", results->http_code);
836 if (results->curl_result != CURLE_OK) {
837 if (msg.len)
838 strbuf_addch(&msg, ' ');
839 strbuf_addf(&msg, "curl %d", results->curl_result);
840 if (curl_errorstr[0]) {
841 strbuf_addch(&msg, ' ');
842 strbuf_addstr(&msg, curl_errorstr);
843 }
844 }
845 error(_("RPC failed; %s"), msg.buf);
846 strbuf_release(&msg);
847 }
848
849 return err;
850 }
851
852 static int probe_rpc(struct rpc_state *rpc, struct slot_results *results)
853 {
854 struct active_request_slot *slot;
855 struct curl_slist *headers = http_copy_default_headers();
856 struct strbuf buf = STRBUF_INIT;
857 int err;
858
859 slot = get_active_slot();
860
861 headers = curl_slist_append(headers, rpc->hdr_content_type);
862 headers = curl_slist_append(headers, rpc->hdr_accept);
863
864 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
865 curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
866 curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
867 curl_easy_setopt(slot->curl, CURLOPT_ENCODING, NULL);
868 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, "0000");
869 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, 4);
870 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
871 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
872 curl_easy_setopt(slot->curl, CURLOPT_WRITEDATA, &buf);
873
874 err = run_slot(slot, results);
875
876 curl_slist_free_all(headers);
877 strbuf_release(&buf);
878 return err;
879 }
880
881 static curl_off_t xcurl_off_t(size_t len)
882 {
883 uintmax_t size = len;
884 if (size > maximum_signed_value_of_type(curl_off_t))
885 die(_("cannot handle pushes this big"));
886 return (curl_off_t)size;
887 }
888
889 /*
890 * If flush_received is true, do not attempt to read any more; just use what's
891 * in rpc->buf.
892 */
893 static int post_rpc(struct rpc_state *rpc, int stateless_connect, int flush_received)
894 {
895 struct active_request_slot *slot;
896 struct curl_slist *headers = http_copy_default_headers();
897 int use_gzip = rpc->gzip_request;
898 char *gzip_body = NULL;
899 size_t gzip_size = 0;
900 int err, large_request = 0;
901 int needs_100_continue = 0;
902 struct rpc_in_data rpc_in_data;
903
904 /* Try to load the entire request, if we can fit it into the
905 * allocated buffer space we can use HTTP/1.0 and avoid the
906 * chunked encoding mess.
907 */
908 if (!flush_received) {
909 while (1) {
910 size_t n;
911 enum packet_read_status status;
912
913 if (!rpc_read_from_out(rpc, 0, &n, &status)) {
914 large_request = 1;
915 use_gzip = 0;
916 break;
917 }
918 if (status == PACKET_READ_FLUSH)
919 break;
920 }
921 }
922
923 if (large_request) {
924 struct slot_results results;
925
926 do {
927 err = probe_rpc(rpc, &results);
928 if (err == HTTP_REAUTH)
929 credential_fill(&http_auth);
930 } while (err == HTTP_REAUTH);
931 if (err != HTTP_OK)
932 return -1;
933
934 if (results.auth_avail & CURLAUTH_GSSNEGOTIATE)
935 needs_100_continue = 1;
936 }
937
938 headers = curl_slist_append(headers, rpc->hdr_content_type);
939 headers = curl_slist_append(headers, rpc->hdr_accept);
940 headers = curl_slist_append(headers, needs_100_continue ?
941 "Expect: 100-continue" : "Expect:");
942
943 /* Add Accept-Language header */
944 if (rpc->hdr_accept_language)
945 headers = curl_slist_append(headers, rpc->hdr_accept_language);
946
947 /* Add the extra Git-Protocol header */
948 if (rpc->protocol_header)
949 headers = curl_slist_append(headers, rpc->protocol_header);
950
951 retry:
952 slot = get_active_slot();
953
954 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
955 curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
956 curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
957 curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "");
958
959 if (large_request) {
960 /* The request body is large and the size cannot be predicted.
961 * We must use chunked encoding to send it.
962 */
963 headers = curl_slist_append(headers, "Transfer-Encoding: chunked");
964 rpc->initial_buffer = 1;
965 curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, rpc_out);
966 curl_easy_setopt(slot->curl, CURLOPT_INFILE, rpc);
967 curl_easy_setopt(slot->curl, CURLOPT_SEEKFUNCTION, rpc_seek);
968 curl_easy_setopt(slot->curl, CURLOPT_SEEKDATA, rpc);
969 if (options.verbosity > 1) {
970 fprintf(stderr, "POST %s (chunked)\n", rpc->service_name);
971 fflush(stderr);
972 }
973
974 } else if (gzip_body) {
975 /*
976 * If we are looping to retry authentication, then the previous
977 * run will have set up the headers and gzip buffer already,
978 * and we just need to send it.
979 */
980 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);
981 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE_LARGE, xcurl_off_t(gzip_size));
982
983 } else if (use_gzip && 1024 < rpc->len) {
984 /* The client backend isn't giving us compressed data so
985 * we can try to deflate it ourselves, this may save on
986 * the transfer time.
987 */
988 git_zstream stream;
989 int ret;
990
991 git_deflate_init_gzip(&stream, Z_BEST_COMPRESSION);
992 gzip_size = git_deflate_bound(&stream, rpc->len);
993 gzip_body = xmalloc(gzip_size);
994
995 stream.next_in = (unsigned char *)rpc->buf;
996 stream.avail_in = rpc->len;
997 stream.next_out = (unsigned char *)gzip_body;
998 stream.avail_out = gzip_size;
999
1000 ret = git_deflate(&stream, Z_FINISH);
1001 if (ret != Z_STREAM_END)
1002 die(_("cannot deflate request; zlib deflate error %d"), ret);
1003
1004 ret = git_deflate_end_gently(&stream);
1005 if (ret != Z_OK)
1006 die(_("cannot deflate request; zlib end error %d"), ret);
1007
1008 gzip_size = stream.total_out;
1009
1010 headers = curl_slist_append(headers, "Content-Encoding: gzip");
1011 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);
1012 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE_LARGE, xcurl_off_t(gzip_size));
1013
1014 if (options.verbosity > 1) {
1015 fprintf(stderr, "POST %s (gzip %lu to %lu bytes)\n",
1016 rpc->service_name,
1017 (unsigned long)rpc->len, (unsigned long)gzip_size);
1018 fflush(stderr);
1019 }
1020 } else {
1021 /* We know the complete request size in advance, use the
1022 * more normal Content-Length approach.
1023 */
1024 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, rpc->buf);
1025 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE_LARGE, xcurl_off_t(rpc->len));
1026 if (options.verbosity > 1) {
1027 fprintf(stderr, "POST %s (%lu bytes)\n",
1028 rpc->service_name, (unsigned long)rpc->len);
1029 fflush(stderr);
1030 }
1031 }
1032
1033 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
1034 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, rpc_in);
1035 rpc_in_data.rpc = rpc;
1036 rpc_in_data.slot = slot;
1037 rpc_in_data.check_pktline = stateless_connect;
1038 memset(&rpc_in_data.pktline_state, 0, sizeof(rpc_in_data.pktline_state));
1039 curl_easy_setopt(slot->curl, CURLOPT_WRITEDATA, &rpc_in_data);
1040 curl_easy_setopt(slot->curl, CURLOPT_FAILONERROR, 0);
1041
1042
1043 rpc->any_written = 0;
1044 err = run_slot(slot, NULL);
1045 if (err == HTTP_REAUTH && !large_request) {
1046 credential_fill(&http_auth);
1047 goto retry;
1048 }
1049 if (err != HTTP_OK)
1050 err = -1;
1051
1052 if (!rpc->any_written)
1053 err = -1;
1054
1055 if (rpc_in_data.pktline_state.len_filled)
1056 err = error(_("%d bytes of length header were received"), rpc_in_data.pktline_state.len_filled);
1057 if (rpc_in_data.pktline_state.remaining)
1058 err = error(_("%d bytes of body are still expected"), rpc_in_data.pktline_state.remaining);
1059
1060 if (stateless_connect)
1061 packet_response_end(rpc->in);
1062
1063 curl_slist_free_all(headers);
1064 free(gzip_body);
1065 return err;
1066 }
1067
1068 static int rpc_service(struct rpc_state *rpc, struct discovery *heads,
1069 const char **client_argv, const struct strbuf *preamble,
1070 struct strbuf *rpc_result)
1071 {
1072 const char *svc = rpc->service_name;
1073 struct strbuf buf = STRBUF_INIT;
1074 struct child_process client = CHILD_PROCESS_INIT;
1075 int err = 0;
1076
1077 client.in = -1;
1078 client.out = -1;
1079 client.git_cmd = 1;
1080 strvec_pushv(&client.args, client_argv);
1081 if (start_command(&client))
1082 exit(1);
1083 write_or_die(client.in, preamble->buf, preamble->len);
1084 if (heads)
1085 write_or_die(client.in, heads->buf, heads->len);
1086
1087 rpc->alloc = http_post_buffer;
1088 rpc->buf = xmalloc(rpc->alloc);
1089 rpc->in = client.in;
1090 rpc->out = client.out;
1091
1092 strbuf_addf(&buf, "%s%s", url.buf, svc);
1093 rpc->service_url = strbuf_detach(&buf, NULL);
1094
1095 rpc->hdr_accept_language = xstrdup_or_null(http_get_accept_language_header());
1096
1097 strbuf_addf(&buf, "Content-Type: application/x-%s-request", svc);
1098 rpc->hdr_content_type = strbuf_detach(&buf, NULL);
1099
1100 strbuf_addf(&buf, "Accept: application/x-%s-result", svc);
1101 rpc->hdr_accept = strbuf_detach(&buf, NULL);
1102
1103 if (get_protocol_http_header(heads->version, &buf))
1104 rpc->protocol_header = strbuf_detach(&buf, NULL);
1105 else
1106 rpc->protocol_header = NULL;
1107
1108 while (!err) {
1109 int n = packet_read(rpc->out, rpc->buf, rpc->alloc, 0);
1110 if (!n)
1111 break;
1112 rpc->pos = 0;
1113 rpc->len = n;
1114 err |= post_rpc(rpc, 0, 0);
1115 }
1116
1117 close(client.in);
1118 client.in = -1;
1119 if (!err) {
1120 strbuf_read(rpc_result, client.out, 0);
1121 } else {
1122 char buf[4096];
1123 for (;;)
1124 if (xread(client.out, buf, sizeof(buf)) <= 0)
1125 break;
1126 }
1127
1128 close(client.out);
1129 client.out = -1;
1130
1131 err |= finish_command(&client);
1132 free(rpc->service_url);
1133 free(rpc->hdr_content_type);
1134 free(rpc->hdr_accept);
1135 free(rpc->hdr_accept_language);
1136 free(rpc->protocol_header);
1137 free(rpc->buf);
1138 strbuf_release(&buf);
1139 return err;
1140 }
1141
1142 static int fetch_dumb(int nr_heads, struct ref **to_fetch)
1143 {
1144 struct walker *walker;
1145 char **targets;
1146 int ret, i;
1147
1148 ALLOC_ARRAY(targets, nr_heads);
1149 if (options.depth || options.deepen_since)
1150 die(_("dumb http transport does not support shallow capabilities"));
1151 for (i = 0; i < nr_heads; i++)
1152 targets[i] = xstrdup(oid_to_hex(&to_fetch[i]->old_oid));
1153
1154 walker = get_http_walker(url.buf);
1155 walker->get_verbosely = options.verbosity >= 3;
1156 walker->get_progress = options.progress;
1157 walker->get_recover = 0;
1158 ret = walker_fetch(walker, nr_heads, targets, NULL, NULL);
1159 walker_free(walker);
1160
1161 for (i = 0; i < nr_heads; i++)
1162 free(targets[i]);
1163 free(targets);
1164
1165 return ret ? error(_("fetch failed.")) : 0;
1166 }
1167
1168 static int fetch_git(struct discovery *heads,
1169 int nr_heads, struct ref **to_fetch)
1170 {
1171 struct rpc_state rpc = RPC_STATE_INIT;
1172 struct strbuf preamble = STRBUF_INIT;
1173 int i, err;
1174 struct strvec args = STRVEC_INIT;
1175 struct strbuf rpc_result = STRBUF_INIT;
1176
1177 strvec_pushl(&args, "fetch-pack", "--stateless-rpc",
1178 "--stdin", "--lock-pack", NULL);
1179 if (options.followtags)
1180 strvec_push(&args, "--include-tag");
1181 if (options.thin)
1182 strvec_push(&args, "--thin");
1183 if (options.verbosity >= 3)
1184 strvec_pushl(&args, "-v", "-v", NULL);
1185 if (options.check_self_contained_and_connected)
1186 strvec_push(&args, "--check-self-contained-and-connected");
1187 if (options.cloning)
1188 strvec_push(&args, "--cloning");
1189 if (options.update_shallow)
1190 strvec_push(&args, "--update-shallow");
1191 if (!options.progress)
1192 strvec_push(&args, "--no-progress");
1193 if (options.depth)
1194 strvec_pushf(&args, "--depth=%lu", options.depth);
1195 if (options.deepen_since)
1196 strvec_pushf(&args, "--shallow-since=%s", options.deepen_since);
1197 for (i = 0; i < options.deepen_not.nr; i++)
1198 strvec_pushf(&args, "--shallow-exclude=%s",
1199 options.deepen_not.items[i].string);
1200 if (options.deepen_relative && options.depth)
1201 strvec_push(&args, "--deepen-relative");
1202 if (options.from_promisor)
1203 strvec_push(&args, "--from-promisor");
1204 if (options.refetch)
1205 strvec_push(&args, "--refetch");
1206 if (options.filter)
1207 strvec_pushf(&args, "--filter=%s", options.filter);
1208 strvec_push(&args, url.buf);
1209
1210 for (i = 0; i < nr_heads; i++) {
1211 struct ref *ref = to_fetch[i];
1212 if (!*ref->name)
1213 die(_("cannot fetch by sha1 over smart http"));
1214 packet_buf_write(&preamble, "%s %s\n",
1215 oid_to_hex(&ref->old_oid), ref->name);
1216 }
1217 packet_buf_flush(&preamble);
1218
1219 memset(&rpc, 0, sizeof(rpc));
1220 rpc.service_name = "git-upload-pack",
1221 rpc.gzip_request = 1;
1222
1223 err = rpc_service(&rpc, heads, args.v, &preamble, &rpc_result);
1224 if (rpc_result.len)
1225 write_or_die(1, rpc_result.buf, rpc_result.len);
1226 strbuf_release(&rpc_result);
1227 strbuf_release(&preamble);
1228 strvec_clear(&args);
1229 return err;
1230 }
1231
1232 static int fetch(int nr_heads, struct ref **to_fetch)
1233 {
1234 struct discovery *d = discover_refs("git-upload-pack", 0);
1235 if (d->proto_git)
1236 return fetch_git(d, nr_heads, to_fetch);
1237 else
1238 return fetch_dumb(nr_heads, to_fetch);
1239 }
1240
1241 static void parse_fetch(struct strbuf *buf)
1242 {
1243 struct ref **to_fetch = NULL;
1244 struct ref *list_head = NULL;
1245 struct ref **list = &list_head;
1246 int alloc_heads = 0, nr_heads = 0;
1247
1248 do {
1249 const char *p;
1250 if (skip_prefix(buf->buf, "fetch ", &p)) {
1251 const char *name;
1252 struct ref *ref;
1253 struct object_id old_oid;
1254 const char *q;
1255
1256 if (parse_oid_hex(p, &old_oid, &q))
1257 die(_("protocol error: expected sha/ref, got '%s'"), p);
1258 if (*q == ' ')
1259 name = q + 1;
1260 else if (!*q)
1261 name = "";
1262 else
1263 die(_("protocol error: expected sha/ref, got '%s'"), p);
1264
1265 ref = alloc_ref(name);
1266 oidcpy(&ref->old_oid, &old_oid);
1267
1268 *list = ref;
1269 list = &ref->next;
1270
1271 ALLOC_GROW(to_fetch, nr_heads + 1, alloc_heads);
1272 to_fetch[nr_heads++] = ref;
1273 }
1274 else
1275 die(_("http transport does not support %s"), buf->buf);
1276
1277 strbuf_reset(buf);
1278 if (strbuf_getline_lf(buf, stdin) == EOF)
1279 return;
1280 if (!*buf->buf)
1281 break;
1282 } while (1);
1283
1284 if (fetch(nr_heads, to_fetch))
1285 exit(128); /* error already reported */
1286 free_refs(list_head);
1287 free(to_fetch);
1288
1289 printf("\n");
1290 fflush(stdout);
1291 strbuf_reset(buf);
1292 }
1293
1294 static void parse_get(const char *arg)
1295 {
1296 struct strbuf url = STRBUF_INIT;
1297 struct strbuf path = STRBUF_INIT;
1298 const char *space;
1299
1300 space = strchr(arg, ' ');
1301
1302 if (!space)
1303 die(_("protocol error: expected '<url> <path>', missing space"));
1304
1305 strbuf_add(&url, arg, space - arg);
1306 strbuf_addstr(&path, space + 1);
1307
1308 if (http_get_file(url.buf, path.buf, NULL))
1309 die(_("failed to download file at URL '%s'"), url.buf);
1310
1311 strbuf_release(&url);
1312 strbuf_release(&path);
1313 printf("\n");
1314 fflush(stdout);
1315 }
1316
1317 static int push_dav(int nr_spec, const char **specs)
1318 {
1319 struct child_process child = CHILD_PROCESS_INIT;
1320 size_t i;
1321
1322 child.git_cmd = 1;
1323 strvec_push(&child.args, "http-push");
1324 strvec_push(&child.args, "--helper-status");
1325 if (options.dry_run)
1326 strvec_push(&child.args, "--dry-run");
1327 if (options.verbosity > 1)
1328 strvec_push(&child.args, "--verbose");
1329 strvec_push(&child.args, url.buf);
1330 for (i = 0; i < nr_spec; i++)
1331 strvec_push(&child.args, specs[i]);
1332
1333 if (run_command(&child))
1334 die(_("git-http-push failed"));
1335 return 0;
1336 }
1337
1338 static int push_git(struct discovery *heads, int nr_spec, const char **specs)
1339 {
1340 struct rpc_state rpc = RPC_STATE_INIT;
1341 int i, err;
1342 struct strvec args;
1343 struct string_list_item *cas_option;
1344 struct strbuf preamble = STRBUF_INIT;
1345 struct strbuf rpc_result = STRBUF_INIT;
1346
1347 strvec_init(&args);
1348 strvec_pushl(&args, "send-pack", "--stateless-rpc", "--helper-status",
1349 NULL);
1350
1351 if (options.thin)
1352 strvec_push(&args, "--thin");
1353 if (options.dry_run)
1354 strvec_push(&args, "--dry-run");
1355 if (options.push_cert == SEND_PACK_PUSH_CERT_ALWAYS)
1356 strvec_push(&args, "--signed=yes");
1357 else if (options.push_cert == SEND_PACK_PUSH_CERT_IF_ASKED)
1358 strvec_push(&args, "--signed=if-asked");
1359 if (options.atomic)
1360 strvec_push(&args, "--atomic");
1361 if (options.verbosity == 0)
1362 strvec_push(&args, "--quiet");
1363 else if (options.verbosity > 1)
1364 strvec_push(&args, "--verbose");
1365 for (i = 0; i < options.push_options.nr; i++)
1366 strvec_pushf(&args, "--push-option=%s",
1367 options.push_options.items[i].string);
1368 strvec_push(&args, options.progress ? "--progress" : "--no-progress");
1369 for_each_string_list_item(cas_option, &cas_options)
1370 strvec_push(&args, cas_option->string);
1371 strvec_push(&args, url.buf);
1372
1373 if (options.force_if_includes)
1374 strvec_push(&args, "--force-if-includes");
1375
1376 strvec_push(&args, "--stdin");
1377 for (i = 0; i < nr_spec; i++)
1378 packet_buf_write(&preamble, "%s\n", specs[i]);
1379 packet_buf_flush(&preamble);
1380
1381 memset(&rpc, 0, sizeof(rpc));
1382 rpc.service_name = "git-receive-pack",
1383
1384 err = rpc_service(&rpc, heads, args.v, &preamble, &rpc_result);
1385 if (rpc_result.len)
1386 write_or_die(1, rpc_result.buf, rpc_result.len);
1387 strbuf_release(&rpc_result);
1388 strbuf_release(&preamble);
1389 strvec_clear(&args);
1390 return err;
1391 }
1392
1393 static int push(int nr_spec, const char **specs)
1394 {
1395 struct discovery *heads = discover_refs("git-receive-pack", 1);
1396 int ret;
1397
1398 if (heads->proto_git)
1399 ret = push_git(heads, nr_spec, specs);
1400 else
1401 ret = push_dav(nr_spec, specs);
1402 free_discovery(heads);
1403 return ret;
1404 }
1405
1406 static void parse_push(struct strbuf *buf)
1407 {
1408 struct strvec specs = STRVEC_INIT;
1409 int ret;
1410
1411 do {
1412 const char *arg;
1413 if (skip_prefix(buf->buf, "push ", &arg))
1414 strvec_push(&specs, arg);
1415 else
1416 die(_("http transport does not support %s"), buf->buf);
1417
1418 strbuf_reset(buf);
1419 if (strbuf_getline_lf(buf, stdin) == EOF)
1420 goto free_specs;
1421 if (!*buf->buf)
1422 break;
1423 } while (1);
1424
1425 ret = push(specs.nr, specs.v);
1426 printf("\n");
1427 fflush(stdout);
1428
1429 if (ret)
1430 exit(128); /* error already reported */
1431
1432 free_specs:
1433 strvec_clear(&specs);
1434 }
1435
1436 static int stateless_connect(const char *service_name)
1437 {
1438 struct discovery *discover;
1439 struct rpc_state rpc = RPC_STATE_INIT;
1440 struct strbuf buf = STRBUF_INIT;
1441 const char *accept_language;
1442
1443 /*
1444 * Run the info/refs request and see if the server supports protocol
1445 * v2. If and only if the server supports v2 can we successfully
1446 * establish a stateless connection, otherwise we need to tell the
1447 * client to fallback to using other transport helper functions to
1448 * complete their request.
1449 *
1450 * The "git-upload-archive" service is a read-only operation. Fallback
1451 * to use "git-upload-pack" service to discover protocol version.
1452 */
1453 if (!strcmp(service_name, "git-upload-archive"))
1454 discover = discover_refs("git-upload-pack", 0);
1455 else
1456 discover = discover_refs(service_name, 0);
1457 if (discover->version != protocol_v2) {
1458 printf("fallback\n");
1459 fflush(stdout);
1460 return -1;
1461 } else {
1462 /* Stateless Connection established */
1463 printf("\n");
1464 fflush(stdout);
1465 }
1466 accept_language = http_get_accept_language_header();
1467 if (accept_language)
1468 rpc.hdr_accept_language = xstrfmt("%s", accept_language);
1469
1470 rpc.service_name = service_name;
1471 rpc.service_url = xstrfmt("%s%s", url.buf, rpc.service_name);
1472 rpc.hdr_content_type = xstrfmt("Content-Type: application/x-%s-request", rpc.service_name);
1473 rpc.hdr_accept = xstrfmt("Accept: application/x-%s-result", rpc.service_name);
1474 if (get_protocol_http_header(discover->version, &buf)) {
1475 rpc.protocol_header = strbuf_detach(&buf, NULL);
1476 } else {
1477 rpc.protocol_header = NULL;
1478 strbuf_release(&buf);
1479 }
1480 rpc.buf = xmalloc(http_post_buffer);
1481 rpc.alloc = http_post_buffer;
1482 rpc.len = 0;
1483 rpc.pos = 0;
1484 rpc.in = 1;
1485 rpc.out = 0;
1486 rpc.any_written = 0;
1487 rpc.gzip_request = 1;
1488 rpc.initial_buffer = 0;
1489 rpc.write_line_lengths = 1;
1490 rpc.flush_read_but_not_sent = 0;
1491
1492 /*
1493 * Dump the capability listing that we got from the server earlier
1494 * during the info/refs request. This does not work with the
1495 * "git-upload-archive" service.
1496 */
1497 if (strcmp(service_name, "git-upload-archive"))
1498 write_or_die(rpc.in, discover->buf, discover->len);
1499
1500 /* Until we see EOF keep sending POSTs */
1501 while (1) {
1502 size_t avail;
1503 enum packet_read_status status;
1504
1505 if (!rpc_read_from_out(&rpc, PACKET_READ_GENTLE_ON_EOF, &avail,
1506 &status))
1507 BUG("The entire rpc->buf should be larger than LARGE_PACKET_MAX");
1508 if (status == PACKET_READ_EOF)
1509 break;
1510 if (post_rpc(&rpc, 1, status == PACKET_READ_FLUSH))
1511 /* We would have an err here */
1512 break;
1513 /* Reset the buffer for next request */
1514 rpc.len = 0;
1515 }
1516
1517 free(rpc.service_url);
1518 free(rpc.hdr_content_type);
1519 free(rpc.hdr_accept);
1520 free(rpc.hdr_accept_language);
1521 free(rpc.protocol_header);
1522 free(rpc.buf);
1523 strbuf_release(&buf);
1524
1525 return 0;
1526 }
1527
1528 int cmd_main(int argc, const char **argv)
1529 {
1530 struct strbuf buf = STRBUF_INIT;
1531 int nongit;
1532 int ret = 1;
1533
1534 setup_git_directory_gently(&nongit);
1535 if (argc < 2) {
1536 error(_("remote-curl: usage: git remote-curl <remote> [<url>]"));
1537 goto cleanup;
1538 }
1539
1540 options.verbosity = 1;
1541 options.progress = !!isatty(2);
1542 options.thin = 1;
1543 string_list_init_dup(&options.deepen_not);
1544 string_list_init_dup(&options.push_options);
1545
1546 /*
1547 * Just report "remote-curl" here (folding all the various aliases
1548 * ("git-remote-http", "git-remote-https", and etc.) here since they
1549 * are all just copies of the same actual executable.
1550 */
1551 trace2_cmd_name("remote-curl");
1552
1553 remote = remote_get(argv[1]);
1554
1555 if (argc > 2) {
1556 end_url_with_slash(&url, argv[2]);
1557 } else {
1558 end_url_with_slash(&url, remote->url[0]);
1559 }
1560
1561 http_init(remote, url.buf, 0);
1562
1563 do {
1564 const char *arg;
1565
1566 if (strbuf_getline_lf(&buf, stdin) == EOF) {
1567 if (ferror(stdin))
1568 error(_("remote-curl: error reading command stream from git"));
1569 goto cleanup;
1570 }
1571 if (buf.len == 0)
1572 break;
1573 if (starts_with(buf.buf, "fetch ")) {
1574 if (nongit) {
1575 setup_git_directory_gently(&nongit);
1576 if (nongit)
1577 die(_("remote-curl: fetch attempted without a local repo"));
1578 }
1579 parse_fetch(&buf);
1580
1581 } else if (!strcmp(buf.buf, "list") || starts_with(buf.buf, "list ")) {
1582 int for_push = !!strstr(buf.buf + 4, "for-push");
1583 output_refs(get_refs(for_push));
1584
1585 } else if (starts_with(buf.buf, "push ")) {
1586 parse_push(&buf);
1587
1588 } else if (skip_prefix(buf.buf, "option ", &arg)) {
1589 char *value = strchr(arg, ' ');
1590 int result;
1591
1592 if (value)
1593 *value++ = '\0';
1594 else
1595 value = "true";
1596
1597 result = set_option(arg, value);
1598 if (!result)
1599 printf("ok\n");
1600 else if (result < 0)
1601 printf("error invalid value\n");
1602 else
1603 printf("unsupported\n");
1604 fflush(stdout);
1605
1606 } else if (skip_prefix(buf.buf, "get ", &arg)) {
1607 parse_get(arg);
1608 fflush(stdout);
1609
1610 } else if (!strcmp(buf.buf, "capabilities")) {
1611 printf("stateless-connect\n");
1612 printf("fetch\n");
1613 printf("get\n");
1614 printf("option\n");
1615 printf("push\n");
1616 printf("check-connectivity\n");
1617 printf("object-format\n");
1618 printf("\n");
1619 fflush(stdout);
1620 } else if (skip_prefix(buf.buf, "stateless-connect ", &arg)) {
1621 if (!stateless_connect(arg))
1622 break;
1623 } else {
1624 error(_("remote-curl: unknown command '%s' from git"), buf.buf);
1625 goto cleanup;
1626 }
1627 strbuf_reset(&buf);
1628 } while (1);
1629
1630 http_cleanup();
1631 ret = 0;
1632 cleanup:
1633 strbuf_release(&buf);
1634
1635 return ret;
1636 }
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