git

1
#define USE_THE_REPOSITORY_VARIABLE
2

3
#include "git-compat-util.h"
4
#include "git-curl-compat.h"
5
#include "config.h"
6
#include "environment.h"
7
#include "gettext.h"
8
#include "hex.h"
9
#include "remote.h"
10
#include "connect.h"
11
#include "strbuf.h"
12
#include "walker.h"
13
#include "http.h"
14
#include "run-command.h"
15
#include "pkt-line.h"
16
#include "string-list.h"
17
#include "strvec.h"
18
#include "credential.h"
19
#include "oid-array.h"
20
#include "send-pack.h"
21
#include "setup.h"
22
#include "protocol.h"
23
#include "quote.h"
24
#include "trace2.h"
25
#include "transport.h"
26
#include "url.h"
27
#include "write-or-die.h"
28

29
static struct remote *remote;
30
/* always ends with a trailing slash */
31
static struct strbuf url = STRBUF_INIT;
32

33
struct options {
34
	int verbosity;
35
	unsigned long depth;
36
	char *deepen_since;
37
	struct string_list deepen_not;
38
	struct string_list push_options;
39
	char *filter;
40
	unsigned progress : 1,
41
		check_self_contained_and_connected : 1,
42
		cloning : 1,
43
		update_shallow : 1,
44
		followtags : 1,
45
		dry_run : 1,
46
		thin : 1,
47
		/* One of the SEND_PACK_PUSH_CERT_* constants. */
48
		push_cert : 2,
49
		deepen_relative : 1,
50

51
		/* see documentation of corresponding flag in fetch-pack.h */
52
		from_promisor : 1,
53

54
		refetch : 1,
55
		atomic : 1,
56
		object_format : 1,
57
		force_if_includes : 1;
58
	const struct git_hash_algo *hash_algo;
59
};
60
static struct options options;
61
static struct string_list cas_options = STRING_LIST_INIT_DUP;
62

63
static int set_option(const char *name, size_t namelen, const char *value)
64
{
65
	if (!strncmp(name, "verbosity", namelen)) {
66
		char *end;
67
		int v = strtol(value, &end, 10);
68
		if (value == end || *end)
69
			return -1;
70
		options.verbosity = v;
71
		return 0;
72
	}
73
	else if (!strncmp(name, "progress", namelen)) {
74
		if (!strcmp(value, "true"))
75
			options.progress = 1;
76
		else if (!strcmp(value, "false"))
77
			options.progress = 0;
78
		else
79
			return -1;
80
		return 0;
81
	}
82
	else if (!strncmp(name, "depth", namelen)) {
83
		char *end;
84
		unsigned long v = strtoul(value, &end, 10);
85
		if (value == end || *end)
86
			return -1;
87
		options.depth = v;
88
		return 0;
89
	}
90
	else if (!strncmp(name, "deepen-since", namelen)) {
91
		options.deepen_since = xstrdup(value);
92
		return 0;
93
	}
94
	else if (!strncmp(name, "deepen-not", namelen)) {
95
		string_list_append(&options.deepen_not, value);
96
		return 0;
97
	}
98
	else if (!strncmp(name, "deepen-relative", namelen)) {
99
		if (!strcmp(value, "true"))
100
			options.deepen_relative = 1;
101
		else if (!strcmp(value, "false"))
102
			options.deepen_relative = 0;
103
		else
104
			return -1;
105
		return 0;
106
	}
107
	else if (!strncmp(name, "followtags", namelen)) {
108
		if (!strcmp(value, "true"))
109
			options.followtags = 1;
110
		else if (!strcmp(value, "false"))
111
			options.followtags = 0;
112
		else
113
			return -1;
114
		return 0;
115
	}
116
	else if (!strncmp(name, "dry-run", namelen)) {
117
		if (!strcmp(value, "true"))
118
			options.dry_run = 1;
119
		else if (!strcmp(value, "false"))
120
			options.dry_run = 0;
121
		else
122
			return -1;
123
		return 0;
124
	}
125
	else if (!strncmp(name, "check-connectivity", namelen)) {
126
		if (!strcmp(value, "true"))
127
			options.check_self_contained_and_connected = 1;
128
		else if (!strcmp(value, "false"))
129
			options.check_self_contained_and_connected = 0;
130
		else
131
			return -1;
132
		return 0;
133
	}
134
	else if (!strncmp(name, "cas", namelen)) {
135
		struct strbuf val = STRBUF_INIT;
136
		strbuf_addstr(&val, "--force-with-lease=");
137
		if (*value != '"')
138
			strbuf_addstr(&val, value);
139
		else if (unquote_c_style(&val, value, NULL))
140
			return -1;
141
		string_list_append(&cas_options, val.buf);
142
		strbuf_release(&val);
143
		return 0;
144
	} else if (!strncmp(name, TRANS_OPT_FORCE_IF_INCLUDES, namelen)) {
145
		if (!strcmp(value, "true"))
146
			options.force_if_includes = 1;
147
		else if (!strcmp(value, "false"))
148
			options.force_if_includes = 0;
149
		else
150
			return -1;
151
		return 0;
152
	} else if (!strncmp(name, "cloning", namelen)) {
153
		if (!strcmp(value, "true"))
154
			options.cloning = 1;
155
		else if (!strcmp(value, "false"))
156
			options.cloning = 0;
157
		else
158
			return -1;
159
		return 0;
160
	} else if (!strncmp(name, "update-shallow", namelen)) {
161
		if (!strcmp(value, "true"))
162
			options.update_shallow = 1;
163
		else if (!strcmp(value, "false"))
164
			options.update_shallow = 0;
165
		else
166
			return -1;
167
		return 0;
168
	} else if (!strncmp(name, "pushcert", namelen)) {
169
		if (!strcmp(value, "true"))
170
			options.push_cert = SEND_PACK_PUSH_CERT_ALWAYS;
171
		else if (!strcmp(value, "false"))
172
			options.push_cert = SEND_PACK_PUSH_CERT_NEVER;
173
		else if (!strcmp(value, "if-asked"))
174
			options.push_cert = SEND_PACK_PUSH_CERT_IF_ASKED;
175
		else
176
			return -1;
177
		return 0;
178
	} else if (!strncmp(name, "atomic", namelen)) {
179
		if (!strcmp(value, "true"))
180
			options.atomic = 1;
181
		else if (!strcmp(value, "false"))
182
			options.atomic = 0;
183
		else
184
			return -1;
185
		return 0;
186
	} else if (!strncmp(name, "push-option", namelen)) {
187
		if (*value != '"')
188
			string_list_append(&options.push_options, value);
189
		else {
190
			struct strbuf unquoted = STRBUF_INIT;
191
			if (unquote_c_style(&unquoted, value, NULL) < 0)
192
				die(_("invalid quoting in push-option value: '%s'"), value);
193
			string_list_append_nodup(&options.push_options,
194
						 strbuf_detach(&unquoted, NULL));
195
		}
196
		return 0;
197
	} else if (!strncmp(name, "family", namelen)) {
198
		if (!strcmp(value, "ipv4"))
199
			git_curl_ipresolve = CURL_IPRESOLVE_V4;
200
		else if (!strcmp(value, "ipv6"))
201
			git_curl_ipresolve = CURL_IPRESOLVE_V6;
202
		else if (!strcmp(value, "all"))
203
			git_curl_ipresolve = CURL_IPRESOLVE_WHATEVER;
204
		else
205
			return -1;
206
		return 0;
207
	} else if (!strncmp(name, "from-promisor", namelen)) {
208
		options.from_promisor = 1;
209
		return 0;
210
	} else if (!strncmp(name, "refetch", namelen)) {
211
		options.refetch = 1;
212
		return 0;
213
	} else if (!strncmp(name, "filter", namelen)) {
214
		options.filter = xstrdup(value);
215
		return 0;
216
	} else if (!strncmp(name, "object-format", namelen)) {
217
		options.object_format = 1;
218
		if (strcmp(value, "true"))
219
			die(_("unknown value for object-format: %s"), value);
220
		return 0;
221
	} else {
222
		return 1 /* unsupported */;
223
	}
224
}
225

226
struct discovery {
227
	char *service;
228
	char *buf_alloc;
229
	char *buf;
230
	size_t len;
231
	struct ref *refs;
232
	struct oid_array shallow;
233
	enum protocol_version version;
234
	unsigned proto_git : 1;
235
};
236
static struct discovery *last_discovery;
237

238
static struct ref *parse_git_refs(struct discovery *heads, int for_push)
239
{
240
	struct ref *list = NULL;
241
	struct packet_reader reader;
242

243
	packet_reader_init(&reader, -1, heads->buf, heads->len,
244
			   PACKET_READ_CHOMP_NEWLINE |
245
			   PACKET_READ_GENTLE_ON_EOF |
246
			   PACKET_READ_DIE_ON_ERR_PACKET);
247

248
	heads->version = discover_version(&reader);
249
	switch (heads->version) {
250
	case protocol_v2:
251
		/*
252
		 * Do nothing.  This isn't a list of refs but rather a
253
		 * capability advertisement.  Client would have run
254
		 * 'stateless-connect' so we'll dump this capability listing
255
		 * and let them request the refs themselves.
256
		 */
257
		break;
258
	case protocol_v1:
259
	case protocol_v0:
260
		get_remote_heads(&reader, &list, for_push ? REF_NORMAL : 0,
261
				 NULL, &heads->shallow);
262
		options.hash_algo = reader.hash_algo;
263
		break;
264
	case protocol_unknown_version:
265
		BUG("unknown protocol version");
266
	}
267

268
	return list;
269
}
270

271
/*
272
 * Try to detect the hash algorithm used by the remote repository when using
273
 * the dumb HTTP transport. As dumb transports cannot tell us the object hash
274
 * directly have to derive it from the advertised ref lengths.
275
 */
276
static const struct git_hash_algo *detect_hash_algo(struct discovery *heads)
277
{
278
	const char *p = memchr(heads->buf, '\t', heads->len);
279
	int algo;
280

281
	/*
282
	 * In case the remote has no refs we have no way to reliably determine
283
	 * the object hash used by that repository. In that case we simply fall
284
	 * back to SHA1, which may or may not be correct.
285
	 */
286
	if (!p)
287
		return &hash_algos[GIT_HASH_SHA1];
288

289
	algo = hash_algo_by_length((p - heads->buf) / 2);
290
	if (algo == GIT_HASH_UNKNOWN)
291
		return NULL;
292
	return &hash_algos[algo];
293
}
294

295
static struct ref *parse_info_refs(struct discovery *heads)
296
{
297
	char *data, *start, *mid;
298
	char *ref_name;
299
	int i = 0;
300

301
	struct ref *refs = NULL;
302
	struct ref *ref = NULL;
303
	struct ref *last_ref = NULL;
304

305
	options.hash_algo = detect_hash_algo(heads);
306
	if (!options.hash_algo)
307
		die("%sinfo/refs not valid: could not determine hash algorithm; "
308
		    "is this a git repository?",
309
		    transport_anonymize_url(url.buf));
310

311
	/*
312
	 * Set the repository's hash algo to whatever we have just detected.
313
	 * This ensures that we can correctly parse the remote references.
314
	 */
315
	repo_set_hash_algo(the_repository, hash_algo_by_ptr(options.hash_algo));
316

317
	data = heads->buf;
318
	start = NULL;
319
	mid = data;
320
	while (i < heads->len) {
321
		if (!start) {
322
			start = &data[i];
323
		}
324
		if (data[i] == '\t')
325
			mid = &data[i];
326
		if (data[i] == '\n') {
327
			if (mid - start != options.hash_algo->hexsz)
328
				die(_("%sinfo/refs not valid: is this a git repository?"),
329
				    transport_anonymize_url(url.buf));
330
			data[i] = 0;
331
			ref_name = mid + 1;
332
			ref = alloc_ref(ref_name);
333
			get_oid_hex_algop(start, &ref->old_oid, options.hash_algo);
334
			if (!refs)
335
				refs = ref;
336
			if (last_ref)
337
				last_ref->next = ref;
338
			last_ref = ref;
339
			start = NULL;
340
		}
341
		i++;
342
	}
343

344
	ref = alloc_ref("HEAD");
345
	if (!http_fetch_ref(url.buf, ref) &&
346
	    !resolve_remote_symref(ref, refs)) {
347
		ref->next = refs;
348
		refs = ref;
349
	} else {
350
		free(ref);
351
	}
352

353
	return refs;
354
}
355

356
static void free_discovery(struct discovery *d)
357
{
358
	if (d) {
359
		if (d == last_discovery)
360
			last_discovery = NULL;
361
		free(d->shallow.oid);
362
		free(d->buf_alloc);
363
		free_refs(d->refs);
364
		free(d->service);
365
		free(d);
366
	}
367
}
368

369
static int show_http_message(struct strbuf *type, struct strbuf *charset,
370
			     struct strbuf *msg)
371
{
372
	const char *p, *eol;
373

374
	/*
375
	 * We only show text/plain parts, as other types are likely
376
	 * to be ugly to look at on the user's terminal.
377
	 */
378
	if (strcmp(type->buf, "text/plain"))
379
		return -1;
380
	if (charset->len)
381
		strbuf_reencode(msg, charset->buf, get_log_output_encoding());
382

383
	strbuf_trim(msg);
384
	if (!msg->len)
385
		return -1;
386

387
	p = msg->buf;
388
	do {
389
		eol = strchrnul(p, '\n');
390
		fprintf(stderr, "remote: %.*s\n", (int)(eol - p), p);
391
		p = eol + 1;
392
	} while(*eol);
393
	return 0;
394
}
395

396
static int get_protocol_http_header(enum protocol_version version,
397
				    struct strbuf *header)
398
{
399
	if (version > 0) {
400
		strbuf_addf(header, GIT_PROTOCOL_HEADER ": version=%d",
401
			    version);
402

403
		return 1;
404
	}
405

406
	return 0;
407
}
408

409
static void check_smart_http(struct discovery *d, const char *service,
410
			     struct strbuf *type)
411
{
412
	const char *p;
413
	struct packet_reader reader;
414

415
	/*
416
	 * If we don't see x-$service-advertisement, then it's not smart-http.
417
	 * But once we do, we commit to it and assume any other protocol
418
	 * violations are hard errors.
419
	 */
420
	if (!skip_prefix(type->buf, "application/x-", &p) ||
421
	    !skip_prefix(p, service, &p) ||
422
	    strcmp(p, "-advertisement"))
423
		return;
424

425
	packet_reader_init(&reader, -1, d->buf, d->len,
426
			   PACKET_READ_CHOMP_NEWLINE |
427
			   PACKET_READ_DIE_ON_ERR_PACKET);
428
	if (packet_reader_read(&reader) != PACKET_READ_NORMAL)
429
		die(_("invalid server response; expected service, got flush packet"));
430

431
	if (skip_prefix(reader.line, "# service=", &p) && !strcmp(p, service)) {
432
		/*
433
		 * The header can include additional metadata lines, up
434
		 * until a packet flush marker.  Ignore these now, but
435
		 * in the future we might start to scan them.
436
		 */
437
		for (;;) {
438
			packet_reader_read(&reader);
439
			if (reader.pktlen <= 0) {
440
				break;
441
			}
442
		}
443

444
		/*
445
		 * v0 smart http; callers expect us to soak up the
446
		 * service and header packets
447
		 */
448
		d->buf = reader.src_buffer;
449
		d->len = reader.src_len;
450
		d->proto_git = 1;
451

452
	} else if (!strcmp(reader.line, "version 2")) {
453
		/*
454
		 * v2 smart http; do not consume version packet, which will
455
		 * be handled elsewhere.
456
		 */
457
		d->proto_git = 1;
458

459
	} else {
460
		die(_("invalid server response; got '%s'"), reader.line);
461
	}
462
}
463

464
static struct discovery *discover_refs(const char *service, int for_push)
465
{
466
	struct strbuf type = STRBUF_INIT;
467
	struct strbuf charset = STRBUF_INIT;
468
	struct strbuf buffer = STRBUF_INIT;
469
	struct strbuf refs_url = STRBUF_INIT;
470
	struct strbuf effective_url = STRBUF_INIT;
471
	struct strbuf protocol_header = STRBUF_INIT;
472
	struct string_list extra_headers = STRING_LIST_INIT_DUP;
473
	struct discovery *last = last_discovery;
474
	int http_ret, maybe_smart = 0;
475
	struct http_get_options http_options;
476
	enum protocol_version version = get_protocol_version_config();
477

478
	if (last && !strcmp(service, last->service))
479
		return last;
480
	free_discovery(last);
481

482
	strbuf_addf(&refs_url, "%sinfo/refs", url.buf);
483
	if ((starts_with(url.buf, "http://") || starts_with(url.buf, "https://")) &&
484
	     git_env_bool("GIT_SMART_HTTP", 1)) {
485
		maybe_smart = 1;
486
		if (!strchr(url.buf, '?'))
487
			strbuf_addch(&refs_url, '?');
488
		else
489
			strbuf_addch(&refs_url, '&');
490
		strbuf_addf(&refs_url, "service=%s", service);
491
	}
492

493
	/*
494
	 * NEEDSWORK: If we are trying to use protocol v2 and we are planning
495
	 * to perform any operation that doesn't involve upload-pack (i.e., a
496
	 * fetch, ls-remote, etc), then fallback to v0 since we don't know how
497
	 * to do anything else (like push or remote archive) via v2.
498
	 */
499
	if (version == protocol_v2 && strcmp("git-upload-pack", service))
500
		version = protocol_v0;
501

502
	/* Add the extra Git-Protocol header */
503
	if (get_protocol_http_header(version, &protocol_header))
504
		string_list_append(&extra_headers, protocol_header.buf);
505

506
	memset(&http_options, 0, sizeof(http_options));
507
	http_options.content_type = &type;
508
	http_options.charset = &charset;
509
	http_options.effective_url = &effective_url;
510
	http_options.base_url = &url;
511
	http_options.extra_headers = &extra_headers;
512
	http_options.initial_request = 1;
513
	http_options.no_cache = 1;
514

515
	http_ret = http_get_strbuf(refs_url.buf, &buffer, &http_options);
516
	switch (http_ret) {
517
	case HTTP_OK:
518
		break;
519
	case HTTP_MISSING_TARGET:
520
		show_http_message(&type, &charset, &buffer);
521
		die(_("repository '%s' not found"),
522
		    transport_anonymize_url(url.buf));
523
	case HTTP_NOAUTH:
524
		show_http_message(&type, &charset, &buffer);
525
		die(_("Authentication failed for '%s'"),
526
		    transport_anonymize_url(url.buf));
527
	case HTTP_NOMATCHPUBLICKEY:
528
		show_http_message(&type, &charset, &buffer);
529
		die(_("unable to access '%s' with http.pinnedPubkey configuration: %s"),
530
		    transport_anonymize_url(url.buf), curl_errorstr);
531
	default:
532
		show_http_message(&type, &charset, &buffer);
533
		die(_("unable to access '%s': %s"),
534
		    transport_anonymize_url(url.buf), curl_errorstr);
535
	}
536

537
	if (options.verbosity && !starts_with(refs_url.buf, url.buf)) {
538
		char *u = transport_anonymize_url(url.buf);
539
		warning(_("redirecting to %s"), u);
540
		free(u);
541
	}
542

543
	last= xcalloc(1, sizeof(*last_discovery));
544
	last->service = xstrdup(service);
545
	last->buf_alloc = strbuf_detach(&buffer, &last->len);
546
	last->buf = last->buf_alloc;
547

548
	if (maybe_smart)
549
		check_smart_http(last, service, &type);
550

551
	if (last->proto_git)
552
		last->refs = parse_git_refs(last, for_push);
553
	else
554
		last->refs = parse_info_refs(last);
555

556
	strbuf_release(&refs_url);
557
	strbuf_release(&type);
558
	strbuf_release(&charset);
559
	strbuf_release(&effective_url);
560
	strbuf_release(&buffer);
561
	strbuf_release(&protocol_header);
562
	string_list_clear(&extra_headers, 0);
563
	last_discovery = last;
564
	return last;
565
}
566

567
static struct ref *get_refs(int for_push)
568
{
569
	struct discovery *heads;
570

571
	if (for_push)
572
		heads = discover_refs("git-receive-pack", for_push);
573
	else
574
		heads = discover_refs("git-upload-pack", for_push);
575

576
	return heads->refs;
577
}
578

579
static void output_refs(struct ref *refs)
580
{
581
	struct ref *posn;
582
	if (options.object_format && options.hash_algo) {
583
		printf(":object-format %s\n", options.hash_algo->name);
584
		repo_set_hash_algo(the_repository,
585
				hash_algo_by_ptr(options.hash_algo));
586
	}
587
	for (posn = refs; posn; posn = posn->next) {
588
		if (posn->symref)
589
			printf("@%s %s\n", posn->symref, posn->name);
590
		else
591
			printf("%s %s\n", hash_to_hex_algop(posn->old_oid.hash,
592
							    options.hash_algo),
593
					  posn->name);
594
	}
595
	printf("\n");
596
	fflush(stdout);
597
}
598

599
struct rpc_state {
600
	const char *service_name;
601
	char *service_url;
602
	char *hdr_content_type;
603
	char *hdr_accept;
604
	char *hdr_accept_language;
605
	char *protocol_header;
606
	char *buf;
607
	size_t alloc;
608
	size_t len;
609
	size_t pos;
610
	int in;
611
	int out;
612
	int any_written;
613
	unsigned gzip_request : 1;
614
	unsigned initial_buffer : 1;
615

616
	/*
617
	 * Whenever a pkt-line is read into buf, append the 4 characters
618
	 * denoting its length before appending the payload.
619
	 */
620
	unsigned write_line_lengths : 1;
621

622
	/*
623
	 * Used by rpc_out; initialize to 0. This is true if a flush has been
624
	 * read, but the corresponding line length (if write_line_lengths is
625
	 * true) and EOF have not been sent to libcurl. Since each flush marks
626
	 * the end of a request, each flush must be completely sent before any
627
	 * further reading occurs.
628
	 */
629
	unsigned flush_read_but_not_sent : 1;
630
};
631

632
#define RPC_STATE_INIT { 0 }
633

634
/*
635
 * Appends the result of reading from rpc->out to the string represented by
636
 * rpc->buf and rpc->len if there is enough space. Returns 1 if there was
637
 * enough space, 0 otherwise.
638
 *
639
 * If rpc->write_line_lengths is true, appends the line length as a 4-byte
640
 * hexadecimal string before appending the result described above.
641
 *
642
 * Writes the total number of bytes appended into appended.
643
 */
644
static int rpc_read_from_out(struct rpc_state *rpc, int options,
645
			     size_t *appended,
646
			     enum packet_read_status *status) {
647
	size_t left;
648
	char *buf;
649
	int pktlen_raw;
650

651
	if (rpc->write_line_lengths) {
652
		left = rpc->alloc - rpc->len - 4;
653
		buf = rpc->buf + rpc->len + 4;
654
	} else {
655
		left = rpc->alloc - rpc->len;
656
		buf = rpc->buf + rpc->len;
657
	}
658

659
	if (left < LARGE_PACKET_MAX)
660
		return 0;
661

662
	*status = packet_read_with_status(rpc->out, NULL, NULL, buf,
663
			left, &pktlen_raw, options);
664
	if (*status != PACKET_READ_EOF) {
665
		*appended = pktlen_raw + (rpc->write_line_lengths ? 4 : 0);
666
		rpc->len += *appended;
667
	}
668

669
	if (rpc->write_line_lengths) {
670
		switch (*status) {
671
		case PACKET_READ_EOF:
672
			if (!(options & PACKET_READ_GENTLE_ON_EOF))
673
				die(_("shouldn't have EOF when not gentle on EOF"));
674
			break;
675
		case PACKET_READ_NORMAL:
676
			set_packet_header(buf - 4, *appended);
677
			break;
678
		case PACKET_READ_DELIM:
679
			memcpy(buf - 4, "0001", 4);
680
			break;
681
		case PACKET_READ_FLUSH:
682
			memcpy(buf - 4, "0000", 4);
683
			break;
684
		case PACKET_READ_RESPONSE_END:
685
			die(_("remote server sent unexpected response end packet"));
686
		}
687
	}
688

689
	return 1;
690
}
691

692
static size_t rpc_out(void *ptr, size_t eltsize,
693
		size_t nmemb, void *buffer_)
694
{
695
	size_t max = eltsize * nmemb;
696
	struct rpc_state *rpc = buffer_;
697
	size_t avail = rpc->len - rpc->pos;
698
	enum packet_read_status status;
699

700
	if (!avail) {
701
		rpc->initial_buffer = 0;
702
		rpc->len = 0;
703
		rpc->pos = 0;
704
		if (!rpc->flush_read_but_not_sent) {
705
			if (!rpc_read_from_out(rpc, 0, &avail, &status))
706
				BUG("The entire rpc->buf should be larger than LARGE_PACKET_MAX");
707
			if (status == PACKET_READ_FLUSH)
708
				rpc->flush_read_but_not_sent = 1;
709
		}
710
		/*
711
		 * If flush_read_but_not_sent is true, we have already read one
712
		 * full request but have not fully sent it + EOF, which is why
713
		 * we need to refrain from reading.
714
		 */
715
	}
716
	if (rpc->flush_read_but_not_sent) {
717
		if (!avail) {
718
			/*
719
			 * The line length either does not need to be sent at
720
			 * all or has already been completely sent. Now we can
721
			 * return 0, indicating EOF, meaning that the flush has
722
			 * been fully sent.
723
			 */
724
			rpc->flush_read_but_not_sent = 0;
725
			return 0;
726
		}
727
		/*
728
		 * If avail is non-zero, the line length for the flush still
729
		 * hasn't been fully sent. Proceed with sending the line
730
		 * length.
731
		 */
732
	}
733

734
	if (max < avail)
735
		avail = max;
736
	memcpy(ptr, rpc->buf + rpc->pos, avail);
737
	rpc->pos += avail;
738
	return avail;
739
}
740

741
static int rpc_seek(void *clientp, curl_off_t offset, int origin)
742
{
743
	struct rpc_state *rpc = clientp;
744

745
	if (origin != SEEK_SET)
746
		BUG("rpc_seek only handles SEEK_SET, not %d", origin);
747

748
	if (rpc->initial_buffer) {
749
		if (offset < 0 || offset > rpc->len) {
750
			error("curl seek would be outside of rpc buffer");
751
			return CURL_SEEKFUNC_FAIL;
752
		}
753
		rpc->pos = offset;
754
		return CURL_SEEKFUNC_OK;
755
	}
756
	error(_("unable to rewind rpc post data - try increasing http.postBuffer"));
757
	return CURL_SEEKFUNC_FAIL;
758
}
759

760
struct check_pktline_state {
761
	char len_buf[4];
762
	int len_filled;
763
	int remaining;
764
};
765

766
static void check_pktline(struct check_pktline_state *state, const char *ptr, size_t size)
767
{
768
	while (size) {
769
		if (!state->remaining) {
770
			int digits_remaining = 4 - state->len_filled;
771
			if (digits_remaining > size)
772
				digits_remaining = size;
773
			memcpy(&state->len_buf[state->len_filled], ptr, digits_remaining);
774
			state->len_filled += digits_remaining;
775
			ptr += digits_remaining;
776
			size -= digits_remaining;
777

778
			if (state->len_filled == 4) {
779
				state->remaining = packet_length(state->len_buf,
780
								 sizeof(state->len_buf));
781
				if (state->remaining < 0) {
782
					die(_("remote-curl: bad line length character: %.4s"), state->len_buf);
783
				} else if (state->remaining == 2) {
784
					die(_("remote-curl: unexpected response end packet"));
785
				} else if (state->remaining < 4) {
786
					state->remaining = 0;
787
				} else {
788
					state->remaining -= 4;
789
				}
790
				state->len_filled = 0;
791
			}
792
		}
793

794
		if (state->remaining) {
795
			int remaining = state->remaining;
796
			if (remaining > size)
797
				remaining = size;
798
			ptr += remaining;
799
			size -= remaining;
800
			state->remaining -= remaining;
801
		}
802
	}
803
}
804

805
struct rpc_in_data {
806
	struct rpc_state *rpc;
807
	struct active_request_slot *slot;
808
	int check_pktline;
809
	struct check_pktline_state pktline_state;
810
};
811

812
/*
813
 * A callback for CURLOPT_WRITEFUNCTION. The return value is the bytes consumed
814
 * from ptr.
815
 */
816
static size_t rpc_in(char *ptr, size_t eltsize,
817
		size_t nmemb, void *buffer_)
818
{
819
	size_t size = eltsize * nmemb;
820
	struct rpc_in_data *data = buffer_;
821
	long response_code;
822

823
	if (curl_easy_getinfo(data->slot->curl, CURLINFO_RESPONSE_CODE,
824
			      &response_code) != CURLE_OK)
825
		return size;
826
	if (response_code >= 300)
827
		return size;
828
	if (size)
829
		data->rpc->any_written = 1;
830
	if (data->check_pktline)
831
		check_pktline(&data->pktline_state, ptr, size);
832
	write_or_die(data->rpc->in, ptr, size);
833
	return size;
834
}
835

836
static int run_slot(struct active_request_slot *slot,
837
		    struct slot_results *results)
838
{
839
	int err;
840
	struct slot_results results_buf;
841

842
	if (!results)
843
		results = &results_buf;
844

845
	err = run_one_slot(slot, results);
846

847
	if (err != HTTP_OK && err != HTTP_REAUTH) {
848
		struct strbuf msg = STRBUF_INIT;
849
		if (results->http_code && results->http_code != 200)
850
			strbuf_addf(&msg, "HTTP %ld", results->http_code);
851
		if (results->curl_result != CURLE_OK) {
852
			if (msg.len)
853
				strbuf_addch(&msg, ' ');
854
			strbuf_addf(&msg, "curl %d", results->curl_result);
855
			if (curl_errorstr[0]) {
856
				strbuf_addch(&msg, ' ');
857
				strbuf_addstr(&msg, curl_errorstr);
858
			}
859
		}
860
		error(_("RPC failed; %s"), msg.buf);
861
		strbuf_release(&msg);
862
	}
863

864
	return err;
865
}
866

867
static int probe_rpc(struct rpc_state *rpc, struct slot_results *results)
868
{
869
	struct active_request_slot *slot;
870
	struct curl_slist *headers = http_copy_default_headers();
871
	struct strbuf buf = STRBUF_INIT;
872
	int err;
873

874
	slot = get_active_slot();
875

876
	headers = curl_slist_append(headers, rpc->hdr_content_type);
877
	headers = curl_slist_append(headers, rpc->hdr_accept);
878

879
	curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
880
	curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
881
	curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
882
	curl_easy_setopt(slot->curl, CURLOPT_ENCODING, NULL);
883
	curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, "0000");
884
	curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, 4);
885
	curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
886
	curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
887
	curl_easy_setopt(slot->curl, CURLOPT_WRITEDATA, &buf);
888

889
	err = run_slot(slot, results);
890

891
	curl_slist_free_all(headers);
892
	strbuf_release(&buf);
893
	return err;
894
}
895

896
static curl_off_t xcurl_off_t(size_t len)
897
{
898
	uintmax_t size = len;
899
	if (size > maximum_signed_value_of_type(curl_off_t))
900
		die(_("cannot handle pushes this big"));
901
	return (curl_off_t)size;
902
}
903

904
/*
905
 * If flush_received is true, do not attempt to read any more; just use what's
906
 * in rpc->buf.
907
 */
908
static int post_rpc(struct rpc_state *rpc, int stateless_connect, int flush_received)
909
{
910
	struct active_request_slot *slot;
911
	struct curl_slist *headers = NULL;
912
	int use_gzip = rpc->gzip_request;
913
	char *gzip_body = NULL;
914
	size_t gzip_size = 0;
915
	int err, large_request = 0;
916
	int needs_100_continue = 0;
917
	struct rpc_in_data rpc_in_data;
918

919
	/* Try to load the entire request, if we can fit it into the
920
	 * allocated buffer space we can use HTTP/1.0 and avoid the
921
	 * chunked encoding mess.
922
	 */
923
	if (!flush_received) {
924
		while (1) {
925
			size_t n;
926
			enum packet_read_status status;
927

928
			if (!rpc_read_from_out(rpc, 0, &n, &status)) {
929
				large_request = 1;
930
				use_gzip = 0;
931
				break;
932
			}
933
			if (status == PACKET_READ_FLUSH)
934
				break;
935
		}
936
	}
937

938
	if (large_request) {
939
		struct slot_results results;
940

941
		do {
942
			err = probe_rpc(rpc, &results);
943
			if (err == HTTP_REAUTH)
944
				credential_fill(&http_auth, 0);
945
		} while (err == HTTP_REAUTH);
946
		if (err != HTTP_OK)
947
			return -1;
948

949
		if (results.auth_avail & CURLAUTH_GSSNEGOTIATE || http_auth.authtype)
950
			needs_100_continue = 1;
951
	}
952

953
retry:
954
	headers = http_copy_default_headers();
955
	headers = curl_slist_append(headers, rpc->hdr_content_type);
956
	headers = curl_slist_append(headers, rpc->hdr_accept);
957
	headers = curl_slist_append(headers, needs_100_continue ?
958
		"Expect: 100-continue" : "Expect:");
959

960
	headers = http_append_auth_header(&http_auth, headers);
961

962
	/* Add Accept-Language header */
963
	if (rpc->hdr_accept_language)
964
		headers = curl_slist_append(headers, rpc->hdr_accept_language);
965

966
	/* Add the extra Git-Protocol header */
967
	if (rpc->protocol_header)
968
		headers = curl_slist_append(headers, rpc->protocol_header);
969

970
	slot = get_active_slot();
971

972
	curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
973
	curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
974
	curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
975
	curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "");
976

977
	if (large_request) {
978
		/* The request body is large and the size cannot be predicted.
979
		 * We must use chunked encoding to send it.
980
		 */
981
#ifdef GIT_CURL_NEED_TRANSFER_ENCODING_HEADER
982
		headers = curl_slist_append(headers, "Transfer-Encoding: chunked");
983
#endif
984
		rpc->initial_buffer = 1;
985
		curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, rpc_out);
986
		curl_easy_setopt(slot->curl, CURLOPT_INFILE, rpc);
987
		curl_easy_setopt(slot->curl, CURLOPT_SEEKFUNCTION, rpc_seek);
988
		curl_easy_setopt(slot->curl, CURLOPT_SEEKDATA, rpc);
989
		if (options.verbosity > 1) {
990
			fprintf(stderr, "POST %s (chunked)\n", rpc->service_name);
991
			fflush(stderr);
992
		}
993

994
	} else if (gzip_body) {
995
		/*
996
		 * If we are looping to retry authentication, then the previous
997
		 * run will have set up the headers and gzip buffer already,
998
		 * and we just need to send it.
999
		 */
1000
		curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);
1001
		curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE_LARGE, xcurl_off_t(gzip_size));
1002

1003
	} else if (use_gzip && 1024 < rpc->len) {
1004
		/* The client backend isn't giving us compressed data so
1005
		 * we can try to deflate it ourselves, this may save on
1006
		 * the transfer time.
1007
		 */
1008
		git_zstream stream;
1009
		int ret;
1010

1011
		git_deflate_init_gzip(&stream, Z_BEST_COMPRESSION);
1012
		gzip_size = git_deflate_bound(&stream, rpc->len);
1013
		gzip_body = xmalloc(gzip_size);
1014

1015
		stream.next_in = (unsigned char *)rpc->buf;
1016
		stream.avail_in = rpc->len;
1017
		stream.next_out = (unsigned char *)gzip_body;
1018
		stream.avail_out = gzip_size;
1019

1020
		ret = git_deflate(&stream, Z_FINISH);
1021
		if (ret != Z_STREAM_END)
1022
			die(_("cannot deflate request; zlib deflate error %d"), ret);
1023

1024
		ret = git_deflate_end_gently(&stream);
1025
		if (ret != Z_OK)
1026
			die(_("cannot deflate request; zlib end error %d"), ret);
1027

1028
		gzip_size = stream.total_out;
1029

1030
		headers = curl_slist_append(headers, "Content-Encoding: gzip");
1031
		curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);
1032
		curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE_LARGE, xcurl_off_t(gzip_size));
1033

1034
		if (options.verbosity > 1) {
1035
			fprintf(stderr, "POST %s (gzip %lu to %lu bytes)\n",
1036
				rpc->service_name,
1037
				(unsigned long)rpc->len, (unsigned long)gzip_size);
1038
			fflush(stderr);
1039
		}
1040
	} else {
1041
		/* We know the complete request size in advance, use the
1042
		 * more normal Content-Length approach.
1043
		 */
1044
		curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, rpc->buf);
1045
		curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE_LARGE, xcurl_off_t(rpc->len));
1046
		if (options.verbosity > 1) {
1047
			fprintf(stderr, "POST %s (%lu bytes)\n",
1048
				rpc->service_name, (unsigned long)rpc->len);
1049
			fflush(stderr);
1050
		}
1051
	}
1052

1053
	curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
1054
	curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, rpc_in);
1055
	rpc_in_data.rpc = rpc;
1056
	rpc_in_data.slot = slot;
1057
	rpc_in_data.check_pktline = stateless_connect;
1058
	memset(&rpc_in_data.pktline_state, 0, sizeof(rpc_in_data.pktline_state));
1059
	curl_easy_setopt(slot->curl, CURLOPT_WRITEDATA, &rpc_in_data);
1060
	curl_easy_setopt(slot->curl, CURLOPT_FAILONERROR, 0);
1061

1062

1063
	rpc->any_written = 0;
1064
	err = run_slot(slot, NULL);
1065
	if (err == HTTP_REAUTH && !large_request) {
1066
		credential_fill(&http_auth, 0);
1067
		curl_slist_free_all(headers);
1068
		goto retry;
1069
	}
1070
	if (err != HTTP_OK)
1071
		err = -1;
1072

1073
	if (!rpc->any_written)
1074
		err = -1;
1075

1076
	if (rpc_in_data.pktline_state.len_filled)
1077
		err = error(_("%d bytes of length header were received"), rpc_in_data.pktline_state.len_filled);
1078
	if (rpc_in_data.pktline_state.remaining)
1079
		err = error(_("%d bytes of body are still expected"), rpc_in_data.pktline_state.remaining);
1080

1081
	if (stateless_connect)
1082
		packet_response_end(rpc->in);
1083

1084
	curl_slist_free_all(headers);
1085
	free(gzip_body);
1086
	return err;
1087
}
1088

1089
static int rpc_service(struct rpc_state *rpc, struct discovery *heads,
1090
		       const char **client_argv, const struct strbuf *preamble,
1091
		       struct strbuf *rpc_result)
1092
{
1093
	const char *svc = rpc->service_name;
1094
	struct strbuf buf = STRBUF_INIT;
1095
	struct child_process client = CHILD_PROCESS_INIT;
1096
	int err = 0;
1097

1098
	client.in = -1;
1099
	client.out = -1;
1100
	client.git_cmd = 1;
1101
	strvec_pushv(&client.args, client_argv);
1102
	if (start_command(&client))
1103
		exit(1);
1104
	write_or_die(client.in, preamble->buf, preamble->len);
1105
	if (heads)
1106
		write_or_die(client.in, heads->buf, heads->len);
1107

1108
	rpc->alloc = http_post_buffer;
1109
	rpc->buf = xmalloc(rpc->alloc);
1110
	rpc->in = client.in;
1111
	rpc->out = client.out;
1112

1113
	strbuf_addf(&buf, "%s%s", url.buf, svc);
1114
	rpc->service_url = strbuf_detach(&buf, NULL);
1115

1116
	rpc->hdr_accept_language = xstrdup_or_null(http_get_accept_language_header());
1117

1118
	strbuf_addf(&buf, "Content-Type: application/x-%s-request", svc);
1119
	rpc->hdr_content_type = strbuf_detach(&buf, NULL);
1120

1121
	strbuf_addf(&buf, "Accept: application/x-%s-result", svc);
1122
	rpc->hdr_accept = strbuf_detach(&buf, NULL);
1123

1124
	if (get_protocol_http_header(heads->version, &buf))
1125
		rpc->protocol_header = strbuf_detach(&buf, NULL);
1126
	else
1127
		rpc->protocol_header = NULL;
1128

1129
	while (!err) {
1130
		int n = packet_read(rpc->out, rpc->buf, rpc->alloc, 0);
1131
		if (!n)
1132
			break;
1133
		rpc->pos = 0;
1134
		rpc->len = n;
1135
		err |= post_rpc(rpc, 0, 0);
1136
	}
1137

1138
	close(client.in);
1139
	client.in = -1;
1140
	if (!err) {
1141
		strbuf_read(rpc_result, client.out, 0);
1142
	} else {
1143
		char buf[4096];
1144
		for (;;)
1145
			if (xread(client.out, buf, sizeof(buf)) <= 0)
1146
				break;
1147
	}
1148

1149
	close(client.out);
1150
	client.out = -1;
1151

1152
	err |= finish_command(&client);
1153
	free(rpc->service_url);
1154
	free(rpc->hdr_content_type);
1155
	free(rpc->hdr_accept);
1156
	free(rpc->hdr_accept_language);
1157
	free(rpc->protocol_header);
1158
	free(rpc->buf);
1159
	strbuf_release(&buf);
1160
	return err;
1161
}
1162

1163
static int fetch_dumb(int nr_heads, struct ref **to_fetch)
1164
{
1165
	struct walker *walker;
1166
	char **targets;
1167
	int ret, i;
1168

1169
	ALLOC_ARRAY(targets, nr_heads);
1170
	if (options.depth || options.deepen_since)
1171
		die(_("dumb http transport does not support shallow capabilities"));
1172
	for (i = 0; i < nr_heads; i++)
1173
		targets[i] = xstrdup(oid_to_hex(&to_fetch[i]->old_oid));
1174

1175
	walker = get_http_walker(url.buf);
1176
	walker->get_verbosely = options.verbosity >= 3;
1177
	walker->get_progress = options.progress;
1178
	walker->get_recover = 0;
1179
	ret = walker_fetch(walker, nr_heads, targets, NULL, NULL);
1180
	walker_free(walker);
1181

1182
	for (i = 0; i < nr_heads; i++)
1183
		free(targets[i]);
1184
	free(targets);
1185

1186
	return ret ? error(_("fetch failed.")) : 0;
1187
}
1188

1189
static int fetch_git(struct discovery *heads,
1190
	int nr_heads, struct ref **to_fetch)
1191
{
1192
	struct rpc_state rpc = RPC_STATE_INIT;
1193
	struct strbuf preamble = STRBUF_INIT;
1194
	int i, err;
1195
	struct strvec args = STRVEC_INIT;
1196
	struct strbuf rpc_result = STRBUF_INIT;
1197

1198
	strvec_pushl(&args, "fetch-pack", "--stateless-rpc",
1199
		     "--stdin", "--lock-pack", NULL);
1200
	if (options.followtags)
1201
		strvec_push(&args, "--include-tag");
1202
	if (options.thin)
1203
		strvec_push(&args, "--thin");
1204
	if (options.verbosity >= 3)
1205
		strvec_pushl(&args, "-v", "-v", NULL);
1206
	if (options.check_self_contained_and_connected)
1207
		strvec_push(&args, "--check-self-contained-and-connected");
1208
	if (options.cloning)
1209
		strvec_push(&args, "--cloning");
1210
	if (options.update_shallow)
1211
		strvec_push(&args, "--update-shallow");
1212
	if (!options.progress)
1213
		strvec_push(&args, "--no-progress");
1214
	if (options.depth)
1215
		strvec_pushf(&args, "--depth=%lu", options.depth);
1216
	if (options.deepen_since)
1217
		strvec_pushf(&args, "--shallow-since=%s", options.deepen_since);
1218
	for (i = 0; i < options.deepen_not.nr; i++)
1219
		strvec_pushf(&args, "--shallow-exclude=%s",
1220
			     options.deepen_not.items[i].string);
1221
	if (options.deepen_relative && options.depth)
1222
		strvec_push(&args, "--deepen-relative");
1223
	if (options.from_promisor)
1224
		strvec_push(&args, "--from-promisor");
1225
	if (options.refetch)
1226
		strvec_push(&args, "--refetch");
1227
	if (options.filter)
1228
		strvec_pushf(&args, "--filter=%s", options.filter);
1229
	strvec_push(&args, url.buf);
1230

1231
	for (i = 0; i < nr_heads; i++) {
1232
		struct ref *ref = to_fetch[i];
1233
		if (!*ref->name)
1234
			die(_("cannot fetch by sha1 over smart http"));
1235
		packet_buf_write(&preamble, "%s %s\n",
1236
				 oid_to_hex(&ref->old_oid), ref->name);
1237
	}
1238
	packet_buf_flush(&preamble);
1239

1240
	memset(&rpc, 0, sizeof(rpc));
1241
	rpc.service_name = "git-upload-pack",
1242
	rpc.gzip_request = 1;
1243

1244
	err = rpc_service(&rpc, heads, args.v, &preamble, &rpc_result);
1245
	if (rpc_result.len)
1246
		write_or_die(1, rpc_result.buf, rpc_result.len);
1247
	strbuf_release(&rpc_result);
1248
	strbuf_release(&preamble);
1249
	strvec_clear(&args);
1250
	return err;
1251
}
1252

1253
static int fetch(int nr_heads, struct ref **to_fetch)
1254
{
1255
	struct discovery *d = discover_refs("git-upload-pack", 0);
1256
	if (d->proto_git)
1257
		return fetch_git(d, nr_heads, to_fetch);
1258
	else
1259
		return fetch_dumb(nr_heads, to_fetch);
1260
}
1261

1262
static void parse_fetch(struct strbuf *buf)
1263
{
1264
	struct ref **to_fetch = NULL;
1265
	struct ref *list_head = NULL;
1266
	struct ref **list = &list_head;
1267
	int alloc_heads = 0, nr_heads = 0;
1268

1269
	do {
1270
		const char *p;
1271
		if (skip_prefix(buf->buf, "fetch ", &p)) {
1272
			const char *name;
1273
			struct ref *ref;
1274
			struct object_id old_oid;
1275
			const char *q;
1276

1277
			if (parse_oid_hex(p, &old_oid, &q))
1278
				die(_("protocol error: expected sha/ref, got '%s'"), p);
1279
			if (*q == ' ')
1280
				name = q + 1;
1281
			else if (!*q)
1282
				name = "";
1283
			else
1284
				die(_("protocol error: expected sha/ref, got '%s'"), p);
1285

1286
			ref = alloc_ref(name);
1287
			oidcpy(&ref->old_oid, &old_oid);
1288

1289
			*list = ref;
1290
			list = &ref->next;
1291

1292
			ALLOC_GROW(to_fetch, nr_heads + 1, alloc_heads);
1293
			to_fetch[nr_heads++] = ref;
1294
		}
1295
		else
1296
			die(_("http transport does not support %s"), buf->buf);
1297

1298
		strbuf_reset(buf);
1299
		if (strbuf_getline_lf(buf, stdin) == EOF)
1300
			return;
1301
		if (!*buf->buf)
1302
			break;
1303
	} while (1);
1304

1305
	if (fetch(nr_heads, to_fetch))
1306
		exit(128); /* error already reported */
1307
	free_refs(list_head);
1308
	free(to_fetch);
1309

1310
	printf("\n");
1311
	fflush(stdout);
1312
	strbuf_reset(buf);
1313
}
1314

1315
static void parse_get(const char *arg)
1316
{
1317
	struct strbuf url = STRBUF_INIT;
1318
	struct strbuf path = STRBUF_INIT;
1319
	const char *space;
1320

1321
	space = strchr(arg, ' ');
1322

1323
	if (!space)
1324
		die(_("protocol error: expected '<url> <path>', missing space"));
1325

1326
	strbuf_add(&url, arg, space - arg);
1327
	strbuf_addstr(&path, space + 1);
1328

1329
	if (http_get_file(url.buf, path.buf, NULL))
1330
		die(_("failed to download file at URL '%s'"), url.buf);
1331

1332
	strbuf_release(&url);
1333
	strbuf_release(&path);
1334
	printf("\n");
1335
	fflush(stdout);
1336
}
1337

1338
static int push_dav(int nr_spec, const char **specs)
1339
{
1340
	struct child_process child = CHILD_PROCESS_INIT;
1341
	size_t i;
1342

1343
	child.git_cmd = 1;
1344
	strvec_push(&child.args, "http-push");
1345
	strvec_push(&child.args, "--helper-status");
1346
	if (options.dry_run)
1347
		strvec_push(&child.args, "--dry-run");
1348
	if (options.verbosity > 1)
1349
		strvec_push(&child.args, "--verbose");
1350
	strvec_push(&child.args, url.buf);
1351
	for (i = 0; i < nr_spec; i++)
1352
		strvec_push(&child.args, specs[i]);
1353

1354
	if (run_command(&child))
1355
		die(_("git-http-push failed"));
1356
	return 0;
1357
}
1358

1359
static int push_git(struct discovery *heads, int nr_spec, const char **specs)
1360
{
1361
	struct rpc_state rpc = RPC_STATE_INIT;
1362
	int i, err;
1363
	struct strvec args;
1364
	struct string_list_item *cas_option;
1365
	struct strbuf preamble = STRBUF_INIT;
1366
	struct strbuf rpc_result = STRBUF_INIT;
1367

1368
	strvec_init(&args);
1369
	strvec_pushl(&args, "send-pack", "--stateless-rpc", "--helper-status",
1370
		     NULL);
1371

1372
	if (options.thin)
1373
		strvec_push(&args, "--thin");
1374
	if (options.dry_run)
1375
		strvec_push(&args, "--dry-run");
1376
	if (options.push_cert == SEND_PACK_PUSH_CERT_ALWAYS)
1377
		strvec_push(&args, "--signed=yes");
1378
	else if (options.push_cert == SEND_PACK_PUSH_CERT_IF_ASKED)
1379
		strvec_push(&args, "--signed=if-asked");
1380
	if (options.atomic)
1381
		strvec_push(&args, "--atomic");
1382
	if (options.verbosity == 0)
1383
		strvec_push(&args, "--quiet");
1384
	else if (options.verbosity > 1)
1385
		strvec_push(&args, "--verbose");
1386
	for (i = 0; i < options.push_options.nr; i++)
1387
		strvec_pushf(&args, "--push-option=%s",
1388
			     options.push_options.items[i].string);
1389
	strvec_push(&args, options.progress ? "--progress" : "--no-progress");
1390
	for_each_string_list_item(cas_option, &cas_options)
1391
		strvec_push(&args, cas_option->string);
1392
	strvec_push(&args, url.buf);
1393

1394
	if (options.force_if_includes)
1395
		strvec_push(&args, "--force-if-includes");
1396

1397
	strvec_push(&args, "--stdin");
1398
	for (i = 0; i < nr_spec; i++)
1399
		packet_buf_write(&preamble, "%s\n", specs[i]);
1400
	packet_buf_flush(&preamble);
1401

1402
	memset(&rpc, 0, sizeof(rpc));
1403
	rpc.service_name = "git-receive-pack",
1404

1405
	err = rpc_service(&rpc, heads, args.v, &preamble, &rpc_result);
1406
	if (rpc_result.len)
1407
		write_or_die(1, rpc_result.buf, rpc_result.len);
1408
	strbuf_release(&rpc_result);
1409
	strbuf_release(&preamble);
1410
	strvec_clear(&args);
1411
	return err;
1412
}
1413

1414
static int push(int nr_spec, const char **specs)
1415
{
1416
	struct discovery *heads = discover_refs("git-receive-pack", 1);
1417
	int ret;
1418

1419
	if (heads->proto_git)
1420
		ret = push_git(heads, nr_spec, specs);
1421
	else
1422
		ret = push_dav(nr_spec, specs);
1423
	free_discovery(heads);
1424
	return ret;
1425
}
1426

1427
static void parse_push(struct strbuf *buf)
1428
{
1429
	struct strvec specs = STRVEC_INIT;
1430
	int ret;
1431

1432
	do {
1433
		const char *arg;
1434
		if (skip_prefix(buf->buf, "push ", &arg))
1435
			strvec_push(&specs, arg);
1436
		else
1437
			die(_("http transport does not support %s"), buf->buf);
1438

1439
		strbuf_reset(buf);
1440
		if (strbuf_getline_lf(buf, stdin) == EOF)
1441
			goto free_specs;
1442
		if (!*buf->buf)
1443
			break;
1444
	} while (1);
1445

1446
	ret = push(specs.nr, specs.v);
1447
	printf("\n");
1448
	fflush(stdout);
1449

1450
	if (ret)
1451
		exit(128); /* error already reported */
1452

1453
free_specs:
1454
	strvec_clear(&specs);
1455
}
1456

1457
static int stateless_connect(const char *service_name)
1458
{
1459
	struct discovery *discover;
1460
	struct rpc_state rpc = RPC_STATE_INIT;
1461
	struct strbuf buf = STRBUF_INIT;
1462
	const char *accept_language;
1463

1464
	/*
1465
	 * Run the info/refs request and see if the server supports protocol
1466
	 * v2.  If and only if the server supports v2 can we successfully
1467
	 * establish a stateless connection, otherwise we need to tell the
1468
	 * client to fallback to using other transport helper functions to
1469
	 * complete their request.
1470
	 *
1471
	 * The "git-upload-archive" service is a read-only operation. Fallback
1472
	 * to use "git-upload-pack" service to discover protocol version.
1473
	 */
1474
	if (!strcmp(service_name, "git-upload-archive"))
1475
		discover = discover_refs("git-upload-pack", 0);
1476
	else
1477
		discover = discover_refs(service_name, 0);
1478
	if (discover->version != protocol_v2) {
1479
		printf("fallback\n");
1480
		fflush(stdout);
1481
		return -1;
1482
	} else {
1483
		/* Stateless Connection established */
1484
		printf("\n");
1485
		fflush(stdout);
1486
	}
1487
	accept_language = http_get_accept_language_header();
1488
	if (accept_language)
1489
		rpc.hdr_accept_language = xstrfmt("%s", accept_language);
1490

1491
	rpc.service_name = service_name;
1492
	rpc.service_url = xstrfmt("%s%s", url.buf, rpc.service_name);
1493
	rpc.hdr_content_type = xstrfmt("Content-Type: application/x-%s-request", rpc.service_name);
1494
	rpc.hdr_accept = xstrfmt("Accept: application/x-%s-result", rpc.service_name);
1495
	if (get_protocol_http_header(discover->version, &buf)) {
1496
		rpc.protocol_header = strbuf_detach(&buf, NULL);
1497
	} else {
1498
		rpc.protocol_header = NULL;
1499
		strbuf_release(&buf);
1500
	}
1501
	rpc.buf = xmalloc(http_post_buffer);
1502
	rpc.alloc = http_post_buffer;
1503
	rpc.len = 0;
1504
	rpc.pos = 0;
1505
	rpc.in = 1;
1506
	rpc.out = 0;
1507
	rpc.any_written = 0;
1508
	rpc.gzip_request = 1;
1509
	rpc.initial_buffer = 0;
1510
	rpc.write_line_lengths = 1;
1511
	rpc.flush_read_but_not_sent = 0;
1512

1513
	/*
1514
	 * Dump the capability listing that we got from the server earlier
1515
	 * during the info/refs request. This does not work with the
1516
	 * "git-upload-archive" service.
1517
	 */
1518
	if (strcmp(service_name, "git-upload-archive"))
1519
		write_or_die(rpc.in, discover->buf, discover->len);
1520

1521
	/* Until we see EOF keep sending POSTs */
1522
	while (1) {
1523
		size_t avail;
1524
		enum packet_read_status status;
1525

1526
		if (!rpc_read_from_out(&rpc, PACKET_READ_GENTLE_ON_EOF, &avail,
1527
				       &status))
1528
			BUG("The entire rpc->buf should be larger than LARGE_PACKET_MAX");
1529
		if (status == PACKET_READ_EOF)
1530
			break;
1531
		if (post_rpc(&rpc, 1, status == PACKET_READ_FLUSH))
1532
			/* We would have an err here */
1533
			break;
1534
		/* Reset the buffer for next request */
1535
		rpc.len = 0;
1536
	}
1537

1538
	free(rpc.service_url);
1539
	free(rpc.hdr_content_type);
1540
	free(rpc.hdr_accept);
1541
	free(rpc.hdr_accept_language);
1542
	free(rpc.protocol_header);
1543
	free(rpc.buf);
1544
	strbuf_release(&buf);
1545

1546
	return 0;
1547
}
1548

1549
int cmd_main(int argc, const char **argv)
1550
{
1551
	struct strbuf buf = STRBUF_INIT;
1552
	int nongit;
1553
	int ret = 1;
1554

1555
	setup_git_directory_gently(&nongit);
1556
	if (argc < 2) {
1557
		error(_("remote-curl: usage: git remote-curl <remote> [<url>]"));
1558
		goto cleanup;
1559
	}
1560

1561
	options.verbosity = 1;
1562
	options.progress = !!isatty(2);
1563
	options.thin = 1;
1564
	string_list_init_dup(&options.deepen_not);
1565
	string_list_init_dup(&options.push_options);
1566

1567
	/*
1568
	 * Just report "remote-curl" here (folding all the various aliases
1569
	 * ("git-remote-http", "git-remote-https", and etc.) here since they
1570
	 * are all just copies of the same actual executable.
1571
	 */
1572
	trace2_cmd_name("remote-curl");
1573

1574
	remote = remote_get(argv[1]);
1575

1576
	if (argc > 2) {
1577
		end_url_with_slash(&url, argv[2]);
1578
	} else {
1579
		end_url_with_slash(&url, remote->url.v[0]);
1580
	}
1581

1582
	http_init(remote, url.buf, 0);
1583

1584
	do {
1585
		const char *arg;
1586

1587
		if (strbuf_getline_lf(&buf, stdin) == EOF) {
1588
			if (ferror(stdin))
1589
				error(_("remote-curl: error reading command stream from git"));
1590
			goto cleanup;
1591
		}
1592
		if (buf.len == 0)
1593
			break;
1594
		if (starts_with(buf.buf, "fetch ")) {
1595
			if (nongit) {
1596
				setup_git_directory_gently(&nongit);
1597
				if (nongit)
1598
					die(_("remote-curl: fetch attempted without a local repo"));
1599
			}
1600
			parse_fetch(&buf);
1601

1602
		} else if (!strcmp(buf.buf, "list") || starts_with(buf.buf, "list ")) {
1603
			int for_push = !!strstr(buf.buf + 4, "for-push");
1604
			output_refs(get_refs(for_push));
1605

1606
		} else if (starts_with(buf.buf, "push ")) {
1607
			parse_push(&buf);
1608

1609
		} else if (skip_prefix(buf.buf, "option ", &arg)) {
1610
			const char *value = strchrnul(arg, ' ');
1611
			size_t arglen = value - arg;
1612
			int result;
1613

1614
			if (*value)
1615
				value++; /* skip over SP */
1616
			else
1617
				value = "true";
1618

1619
			result = set_option(arg, arglen, value);
1620
			if (!result)
1621
				printf("ok\n");
1622
			else if (result < 0)
1623
				printf("error invalid value\n");
1624
			else
1625
				printf("unsupported\n");
1626
			fflush(stdout);
1627

1628
		} else if (skip_prefix(buf.buf, "get ", &arg)) {
1629
			parse_get(arg);
1630
			fflush(stdout);
1631

1632
		} else if (!strcmp(buf.buf, "capabilities")) {
1633
			printf("stateless-connect\n");
1634
			printf("fetch\n");
1635
			printf("get\n");
1636
			printf("option\n");
1637
			printf("push\n");
1638
			printf("check-connectivity\n");
1639
			printf("object-format\n");
1640
			printf("\n");
1641
			fflush(stdout);
1642
		} else if (skip_prefix(buf.buf, "stateless-connect ", &arg)) {
1643
			if (!stateless_connect(arg))
1644
				break;
1645
		} else {
1646
			error(_("remote-curl: unknown command '%s' from git"), buf.buf);
1647
			goto cleanup;
1648
		}
1649
		strbuf_reset(&buf);
1650
	} while (1);
1651

1652
	http_cleanup();
1653
	ret = 0;
1654
cleanup:
1655
	strbuf_release(&buf);
1656

1657
	return ret;
1658
}
1659