Smart push over HTTP: client side
[git/git.git] / remote-curl.c
CommitLineData
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1#include "cache.h"
2#include "remote.h"
3#include "strbuf.h"
4#include "walker.h"
5#include "http.h"
d01a8e32 6#include "exec_cmd.h"
ae4efe19 7#include "run-command.h"
97cc7bc4 8#include "pkt-line.h"
de1a2fdd 9#include "sideband.h"
a2d725b7 10
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11static struct remote *remote;
12static const char *url;
13static struct walker *walker;
14
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15struct options {
16 int verbosity;
17 unsigned long depth;
18 unsigned progress : 1,
ae4efe19 19 followtags : 1,
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20 dry_run : 1,
21 thin : 1;
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22};
23static struct options options;
24
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25static void init_walker(void)
26{
27 if (!walker)
28 walker = get_http_walker(url, remote);
29}
30
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31static int set_option(const char *name, const char *value)
32{
33 if (!strcmp(name, "verbosity")) {
34 char *end;
35 int v = strtol(value, &end, 10);
36 if (value == end || *end)
37 return -1;
38 options.verbosity = v;
39 return 0;
40 }
41 else if (!strcmp(name, "progress")) {
42 if (!strcmp(value, "true"))
43 options.progress = 1;
44 else if (!strcmp(value, "false"))
45 options.progress = 0;
46 else
47 return -1;
48 return 1 /* TODO implement later */;
49 }
50 else if (!strcmp(name, "depth")) {
51 char *end;
52 unsigned long v = strtoul(value, &end, 10);
53 if (value == end || *end)
54 return -1;
55 options.depth = v;
56 return 1 /* TODO implement later */;
57 }
58 else if (!strcmp(name, "followtags")) {
59 if (!strcmp(value, "true"))
60 options.followtags = 1;
61 else if (!strcmp(value, "false"))
62 options.followtags = 0;
63 else
64 return -1;
65 return 1 /* TODO implement later */;
66 }
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67 else if (!strcmp(name, "dry-run")) {
68 if (!strcmp(value, "true"))
69 options.dry_run = 1;
70 else if (!strcmp(value, "false"))
71 options.dry_run = 0;
72 else
73 return -1;
74 return 0;
75 }
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76 else {
77 return 1 /* unsupported */;
78 }
79}
80
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81struct discovery {
82 const char *service;
83 char *buf_alloc;
84 char *buf;
85 size_t len;
86 unsigned proto_git : 1;
87};
88static struct discovery *last_discovery;
89
90static void free_discovery(struct discovery *d)
91{
92 if (d) {
93 if (d == last_discovery)
94 last_discovery = NULL;
95 free(d->buf_alloc);
96 free(d);
97 }
98}
99
100static struct discovery* discover_refs(const char *service)
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101{
102 struct strbuf buffer = STRBUF_INIT;
97cc7bc4 103 struct discovery *last = last_discovery;
a2d725b7 104 char *refs_url;
97cc7bc4 105 int http_ret, is_http = 0;
a2d725b7 106
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107 if (last && !strcmp(service, last->service))
108 return last;
109 free_discovery(last);
a2d725b7 110
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111 strbuf_addf(&buffer, "%s/info/refs", url);
112 if (!prefixcmp(url, "http://") || !prefixcmp(url, "https://")) {
113 is_http = 1;
114 if (!strchr(url, '?'))
115 strbuf_addch(&buffer, '?');
116 else
117 strbuf_addch(&buffer, '&');
118 strbuf_addf(&buffer, "service=%s", service);
119 }
120 refs_url = strbuf_detach(&buffer, NULL);
a2d725b7 121
37a8768f 122 init_walker();
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123 http_ret = http_get_strbuf(refs_url, &buffer, HTTP_NO_CACHE);
124 switch (http_ret) {
125 case HTTP_OK:
126 break;
127 case HTTP_MISSING_TARGET:
128 die("%s not found: did you run git update-server-info on the"
129 " server?", refs_url);
130 default:
131 http_error(refs_url, http_ret);
132 die("HTTP request failed");
133 }
134
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135 last= xcalloc(1, sizeof(*last_discovery));
136 last->service = service;
137 last->buf_alloc = strbuf_detach(&buffer, &last->len);
138 last->buf = last->buf_alloc;
139
140 if (is_http && 5 <= last->len && last->buf[4] == '#') {
141 /* smart HTTP response; validate that the service
142 * pkt-line matches our request.
143 */
144 struct strbuf exp = STRBUF_INIT;
145
146 if (packet_get_line(&buffer, &last->buf, &last->len) <= 0)
147 die("%s has invalid packet header", refs_url);
148 if (buffer.len && buffer.buf[buffer.len - 1] == '\n')
149 strbuf_setlen(&buffer, buffer.len - 1);
150
151 strbuf_addf(&exp, "# service=%s", service);
152 if (strbuf_cmp(&exp, &buffer))
153 die("invalid server response; got '%s'", buffer.buf);
154 strbuf_release(&exp);
155
156 /* The header can include additional metadata lines, up
157 * until a packet flush marker. Ignore these now, but
158 * in the future we might start to scan them.
159 */
160 strbuf_reset(&buffer);
161 while (packet_get_line(&buffer, &last->buf, &last->len) > 0)
162 strbuf_reset(&buffer);
163
164 last->proto_git = 1;
165 }
166
167 free(refs_url);
168 strbuf_release(&buffer);
169 last_discovery = last;
170 return last;
171}
172
173static int write_discovery(int fd, void *data)
174{
175 struct discovery *heads = data;
176 int err = 0;
177 if (write_in_full(fd, heads->buf, heads->len) != heads->len)
178 err = 1;
179 close(fd);
180 return err;
181}
182
183static struct ref *parse_git_refs(struct discovery *heads)
184{
185 struct ref *list = NULL;
186 struct async async;
187
188 memset(&async, 0, sizeof(async));
189 async.proc = write_discovery;
190 async.data = heads;
191
192 if (start_async(&async))
193 die("cannot start thread to parse advertised refs");
194 get_remote_heads(async.out, &list, 0, NULL, 0, NULL);
195 close(async.out);
196 if (finish_async(&async))
197 die("ref parsing thread failed");
198 return list;
199}
200
201static struct ref *parse_info_refs(struct discovery *heads)
202{
203 char *data, *start, *mid;
204 char *ref_name;
205 int i = 0;
206
207 struct ref *refs = NULL;
208 struct ref *ref = NULL;
209 struct ref *last_ref = NULL;
210
211 data = heads->buf;
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212 start = NULL;
213 mid = data;
97cc7bc4 214 while (i < heads->len) {
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215 if (!start) {
216 start = &data[i];
217 }
218 if (data[i] == '\t')
219 mid = &data[i];
220 if (data[i] == '\n') {
221 data[i] = 0;
222 ref_name = mid + 1;
223 ref = xmalloc(sizeof(struct ref) +
224 strlen(ref_name) + 1);
225 memset(ref, 0, sizeof(struct ref));
226 strcpy(ref->name, ref_name);
227 get_sha1_hex(start, ref->old_sha1);
228 if (!refs)
229 refs = ref;
230 if (last_ref)
231 last_ref->next = ref;
232 last_ref = ref;
233 start = NULL;
234 }
235 i++;
236 }
237
97cc7bc4 238 init_walker();
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239 ref = alloc_ref("HEAD");
240 if (!walker->fetch_ref(walker, ref) &&
241 !resolve_remote_symref(ref, refs)) {
242 ref->next = refs;
243 refs = ref;
244 } else {
245 free(ref);
246 }
247
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248 return refs;
249}
250
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251static struct ref *get_refs(int for_push)
252{
253 struct discovery *heads;
254
255 if (for_push)
256 heads = discover_refs("git-receive-pack");
257 else
258 heads = discover_refs("git-upload-pack");
259
260 if (heads->proto_git)
261 return parse_git_refs(heads);
262 return parse_info_refs(heads);
263}
264
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265static void output_refs(struct ref *refs)
266{
267 struct ref *posn;
268 for (posn = refs; posn; posn = posn->next) {
269 if (posn->symref)
270 printf("@%s %s\n", posn->symref, posn->name);
271 else
272 printf("%s %s\n", sha1_to_hex(posn->old_sha1), posn->name);
273 }
274 printf("\n");
275 fflush(stdout);
276 free_refs(refs);
277}
278
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279struct rpc_state {
280 const char *service_name;
281 const char **argv;
282 char *service_url;
283 char *hdr_content_type;
284 char *hdr_accept;
285 char *buf;
286 size_t alloc;
287 size_t len;
288 size_t pos;
289 int in;
290 int out;
291 struct strbuf result;
292};
293
294static size_t rpc_out(void *ptr, size_t eltsize,
295 size_t nmemb, void *buffer_)
296{
297 size_t max = eltsize * nmemb;
298 struct rpc_state *rpc = buffer_;
299 size_t avail = rpc->len - rpc->pos;
300
301 if (!avail) {
302 avail = packet_read_line(rpc->out, rpc->buf, rpc->alloc);
303 if (!avail)
304 return 0;
305 rpc->pos = 0;
306 rpc->len = avail;
307 }
308
309 if (max < avail);
310 avail = max;
311 memcpy(ptr, rpc->buf + rpc->pos, avail);
312 rpc->pos += avail;
313 return avail;
314}
315
316static size_t rpc_in(const void *ptr, size_t eltsize,
317 size_t nmemb, void *buffer_)
318{
319 size_t size = eltsize * nmemb;
320 struct rpc_state *rpc = buffer_;
321 write_or_die(rpc->in, ptr, size);
322 return size;
323}
324
325static int post_rpc(struct rpc_state *rpc)
326{
327 struct active_request_slot *slot;
328 struct slot_results results;
329 struct curl_slist *headers = NULL;
330 int err = 0, large_request = 0;
331
332 /* Try to load the entire request, if we can fit it into the
333 * allocated buffer space we can use HTTP/1.0 and avoid the
334 * chunked encoding mess.
335 */
336 while (1) {
337 size_t left = rpc->alloc - rpc->len;
338 char *buf = rpc->buf + rpc->len;
339 int n;
340
341 if (left < LARGE_PACKET_MAX) {
342 large_request = 1;
343 break;
344 }
345
346 n = packet_read_line(rpc->out, buf, left);
347 if (!n)
348 break;
349 rpc->len += n;
350 }
351
352 slot = get_active_slot();
353 slot->results = &results;
354
355 curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
356 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
357 curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
358
359 headers = curl_slist_append(headers, rpc->hdr_content_type);
360 headers = curl_slist_append(headers, rpc->hdr_accept);
361
362 if (large_request) {
363 /* The request body is large and the size cannot be predicted.
364 * We must use chunked encoding to send it.
365 */
366 headers = curl_slist_append(headers, "Expect: 100-continue");
367 headers = curl_slist_append(headers, "Transfer-Encoding: chunked");
368 curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, rpc_out);
369 curl_easy_setopt(slot->curl, CURLOPT_INFILE, rpc);
370 if (options.verbosity > 1) {
371 fprintf(stderr, "POST %s (chunked)\n", rpc->service_name);
372 fflush(stderr);
373 }
374
375 } else {
376 /* We know the complete request size in advance, use the
377 * more normal Content-Length approach.
378 */
379 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, rpc->buf);
380 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, rpc->len);
381 if (options.verbosity > 1) {
382 fprintf(stderr, "POST %s (%lu bytes)\n",
383 rpc->service_name, (unsigned long)rpc->len);
384 fflush(stderr);
385 }
386 }
387
388 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
389 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, rpc_in);
390 curl_easy_setopt(slot->curl, CURLOPT_FILE, rpc);
391
392 slot->curl_result = curl_easy_perform(slot->curl);
393 finish_active_slot(slot);
394
395 if (results.curl_result != CURLE_OK) {
396 err |= error("RPC failed; result=%d, HTTP code = %ld",
397 results.curl_result, results.http_code);
398 }
399
400 curl_slist_free_all(headers);
401 return err;
402}
403
404static int rpc_service(struct rpc_state *rpc, struct discovery *heads)
405{
406 const char *svc = rpc->service_name;
407 struct strbuf buf = STRBUF_INIT;
408 struct child_process client;
409 int err = 0;
410
411 init_walker();
412 memset(&client, 0, sizeof(client));
413 client.in = -1;
414 client.out = -1;
415 client.git_cmd = 1;
416 client.argv = rpc->argv;
417 if (start_command(&client))
418 exit(1);
419 if (heads)
420 write_or_die(client.in, heads->buf, heads->len);
421
422 rpc->alloc = http_post_buffer;
423 rpc->buf = xmalloc(rpc->alloc);
424 rpc->in = client.in;
425 rpc->out = client.out;
426 strbuf_init(&rpc->result, 0);
427
428 strbuf_addf(&buf, "%s/%s", url, svc);
429 rpc->service_url = strbuf_detach(&buf, NULL);
430
431 strbuf_addf(&buf, "Content-Type: application/x-%s-request", svc);
432 rpc->hdr_content_type = strbuf_detach(&buf, NULL);
433
434 strbuf_addf(&buf, "Accept: application/x-%s-response", svc);
435 rpc->hdr_accept = strbuf_detach(&buf, NULL);
436
437 while (!err) {
438 int n = packet_read_line(rpc->out, rpc->buf, rpc->alloc);
439 if (!n)
440 break;
441 rpc->pos = 0;
442 rpc->len = n;
443 err |= post_rpc(rpc);
444 }
445 strbuf_read(&rpc->result, client.out, 0);
446
447 close(client.in);
448 close(client.out);
449 client.in = -1;
450 client.out = -1;
451
452 err |= finish_command(&client);
453 free(rpc->service_url);
454 free(rpc->hdr_content_type);
455 free(rpc->hdr_accept);
456 free(rpc->buf);
457 strbuf_release(&buf);
458 return err;
459}
460
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461static int fetch_dumb(int nr_heads, struct ref **to_fetch)
462{
463 char **targets = xmalloc(nr_heads * sizeof(char*));
464 int ret, i;
465
466 for (i = 0; i < nr_heads; i++)
467 targets[i] = xstrdup(sha1_to_hex(to_fetch[i]->old_sha1));
468
469 init_walker();
470 walker->get_all = 1;
471 walker->get_tree = 1;
472 walker->get_history = 1;
ef08ef9e 473 walker->get_verbosely = options.verbosity >= 3;
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SP
474 walker->get_recover = 0;
475 ret = walker_fetch(walker, nr_heads, targets, NULL, NULL);
476
477 for (i = 0; i < nr_heads; i++)
478 free(targets[i]);
479 free(targets);
480
481 return ret ? error("Fetch failed.") : 0;
482}
483
484static void parse_fetch(struct strbuf *buf)
485{
486 struct ref **to_fetch = NULL;
487 struct ref *list_head = NULL;
488 struct ref **list = &list_head;
489 int alloc_heads = 0, nr_heads = 0;
490
491 do {
492 if (!prefixcmp(buf->buf, "fetch ")) {
493 char *p = buf->buf + strlen("fetch ");
494 char *name;
495 struct ref *ref;
496 unsigned char old_sha1[20];
497
498 if (strlen(p) < 40 || get_sha1_hex(p, old_sha1))
499 die("protocol error: expected sha/ref, got %s'", p);
500 if (p[40] == ' ')
501 name = p + 41;
502 else if (!p[40])
503 name = "";
504 else
505 die("protocol error: expected sha/ref, got %s'", p);
506
507 ref = alloc_ref(name);
508 hashcpy(ref->old_sha1, old_sha1);
509
510 *list = ref;
511 list = &ref->next;
512
513 ALLOC_GROW(to_fetch, nr_heads + 1, alloc_heads);
514 to_fetch[nr_heads++] = ref;
515 }
516 else
517 die("http transport does not support %s", buf->buf);
518
519 strbuf_reset(buf);
520 if (strbuf_getline(buf, stdin, '\n') == EOF)
521 return;
522 if (!*buf->buf)
523 break;
524 } while (1);
525
526 if (fetch_dumb(nr_heads, to_fetch))
527 exit(128); /* error already reported */
528 free_refs(list_head);
529 free(to_fetch);
530
531 printf("\n");
532 fflush(stdout);
533 strbuf_reset(buf);
534}
535
ae4efe19
SP
536static int push_dav(int nr_spec, char **specs)
537{
538 const char **argv = xmalloc((10 + nr_spec) * sizeof(char*));
539 int argc = 0, i;
540
541 argv[argc++] = "http-push";
542 argv[argc++] = "--helper-status";
543 if (options.dry_run)
544 argv[argc++] = "--dry-run";
545 if (options.verbosity > 1)
546 argv[argc++] = "--verbose";
547 argv[argc++] = url;
548 for (i = 0; i < nr_spec; i++)
549 argv[argc++] = specs[i];
550 argv[argc++] = NULL;
551
552 if (run_command_v_opt(argv, RUN_GIT_CMD))
553 die("git-%s failed", argv[0]);
554 free(argv);
555 return 0;
556}
557
de1a2fdd
SP
558static int push_git(struct discovery *heads, int nr_spec, char **specs)
559{
560 struct rpc_state rpc;
561 const char **argv;
562 int argc = 0, i, err;
563
564 argv = xmalloc((10 + nr_spec) * sizeof(char*));
565 argv[argc++] = "send-pack";
566 argv[argc++] = "--stateless-rpc";
567 argv[argc++] = "--helper-status";
568 if (options.thin)
569 argv[argc++] = "--thin";
570 if (options.dry_run)
571 argv[argc++] = "--dry-run";
572 if (options.verbosity > 1)
573 argv[argc++] = "--verbose";
574 argv[argc++] = url;
575 for (i = 0; i < nr_spec; i++)
576 argv[argc++] = specs[i];
577 argv[argc++] = NULL;
578
579 memset(&rpc, 0, sizeof(rpc));
580 rpc.service_name = "git-receive-pack",
581 rpc.argv = argv;
582
583 err = rpc_service(&rpc, heads);
584 if (rpc.result.len)
585 safe_write(1, rpc.result.buf, rpc.result.len);
586 strbuf_release(&rpc.result);
587 free(argv);
588 return err;
589}
590
591static int push(int nr_spec, char **specs)
592{
593 struct discovery *heads = discover_refs("git-receive-pack");
594 int ret;
595
596 if (heads->proto_git)
597 ret = push_git(heads, nr_spec, specs);
598 else
599 ret = push_dav(nr_spec, specs);
600 free_discovery(heads);
601 return ret;
602}
603
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SP
604static void parse_push(struct strbuf *buf)
605{
606 char **specs = NULL;
607 int alloc_spec = 0, nr_spec = 0, i;
608
609 do {
610 if (!prefixcmp(buf->buf, "push ")) {
611 ALLOC_GROW(specs, nr_spec + 1, alloc_spec);
612 specs[nr_spec++] = xstrdup(buf->buf + 5);
613 }
614 else
615 die("http transport does not support %s", buf->buf);
616
617 strbuf_reset(buf);
618 if (strbuf_getline(buf, stdin, '\n') == EOF)
619 return;
620 if (!*buf->buf)
621 break;
622 } while (1);
623
de1a2fdd 624 if (push(nr_spec, specs))
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SP
625 exit(128); /* error already reported */
626 for (i = 0; i < nr_spec; i++)
627 free(specs[i]);
628 free(specs);
629
630 printf("\n");
631 fflush(stdout);
632}
633
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DB
634int main(int argc, const char **argv)
635{
a2d725b7 636 struct strbuf buf = STRBUF_INIT;
a2d725b7 637
c6dfb399 638 git_extract_argv0_path(argv[0]);
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DB
639 setup_git_directory();
640 if (argc < 2) {
641 fprintf(stderr, "Remote needed\n");
642 return 1;
643 }
644
ef08ef9e
SP
645 options.verbosity = 1;
646 options.progress = !!isatty(2);
de1a2fdd 647 options.thin = 1;
ef08ef9e 648
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DB
649 remote = remote_get(argv[1]);
650
651 if (argc > 2) {
652 url = argv[2];
653 } else {
654 url = remote->url[0];
655 }
656
657 do {
658 if (strbuf_getline(&buf, stdin, '\n') == EOF)
659 break;
660 if (!prefixcmp(buf.buf, "fetch ")) {
292ce46b
SP
661 parse_fetch(&buf);
662
ae4efe19 663 } else if (!strcmp(buf.buf, "list") || !prefixcmp(buf.buf, "list ")) {
97cc7bc4
SP
664 int for_push = !!strstr(buf.buf + 4, "for-push");
665 output_refs(get_refs(for_push));
ae4efe19
SP
666
667 } else if (!prefixcmp(buf.buf, "push ")) {
668 parse_push(&buf);
669
ef08ef9e
SP
670 } else if (!prefixcmp(buf.buf, "option ")) {
671 char *name = buf.buf + strlen("option ");
672 char *value = strchr(name, ' ');
673 int result;
674
675 if (value)
676 *value++ = '\0';
677 else
678 value = "true";
679
680 result = set_option(name, value);
681 if (!result)
682 printf("ok\n");
683 else if (result < 0)
684 printf("error invalid value\n");
685 else
686 printf("unsupported\n");
687 fflush(stdout);
688
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DB
689 } else if (!strcmp(buf.buf, "capabilities")) {
690 printf("fetch\n");
ef08ef9e 691 printf("option\n");
ae4efe19 692 printf("push\n");
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DB
693 printf("\n");
694 fflush(stdout);
695 } else {
696 return 1;
697 }
698 strbuf_reset(&buf);
699 } while (1);
700 return 0;
701}