33f3949252f2dbf0b724b6cfebde236f7d78d728
[git/git.git] / http-fetch.c
1 #include "cache.h"
2 #include "commit.h"
3
4 #include "fetch.h"
5
6 #include <curl/curl.h>
7 #include <curl/easy.h>
8
9 #if LIBCURL_VERSION_NUM < 0x070704
10 #define curl_global_cleanup() do { /* nothing */ } while(0)
11 #endif
12 #if LIBCURL_VERSION_NUM < 0x070800
13 #define curl_global_init(a) do { /* nothing */ } while(0)
14 #endif
15
16 static CURL *curl;
17 static struct curl_slist *no_pragma_header;
18 static char curl_errorstr[CURL_ERROR_SIZE];
19
20 static char *initial_base;
21
22 struct alt_base
23 {
24 char *base;
25 int got_indices;
26 struct packed_git *packs;
27 struct alt_base *next;
28 };
29
30 static struct alt_base *alt = NULL;
31
32 static SHA_CTX c;
33 static z_stream stream;
34
35 static int local;
36 static int zret;
37
38 static int curl_ssl_verify;
39 static char *ssl_cert;
40 static char *ssl_key;
41 static char *ssl_capath;
42 static char *ssl_cainfo;
43
44 struct buffer
45 {
46 size_t posn;
47 size_t size;
48 void *buffer;
49 };
50
51 static size_t fwrite_buffer(void *ptr, size_t eltsize, size_t nmemb,
52 struct buffer *buffer)
53 {
54 size_t size = eltsize * nmemb;
55 if (size > buffer->size - buffer->posn)
56 size = buffer->size - buffer->posn;
57 memcpy(buffer->buffer + buffer->posn, ptr, size);
58 buffer->posn += size;
59 return size;
60 }
61
62 static size_t fwrite_sha1_file(void *ptr, size_t eltsize, size_t nmemb,
63 void *data)
64 {
65 unsigned char expn[4096];
66 size_t size = eltsize * nmemb;
67 int posn = 0;
68 do {
69 ssize_t retval = write(local, ptr + posn, size - posn);
70 if (retval < 0)
71 return posn;
72 posn += retval;
73 } while (posn < size);
74
75 stream.avail_in = size;
76 stream.next_in = ptr;
77 do {
78 stream.next_out = expn;
79 stream.avail_out = sizeof(expn);
80 zret = inflate(&stream, Z_SYNC_FLUSH);
81 SHA1_Update(&c, expn, sizeof(expn) - stream.avail_out);
82 } while (stream.avail_in && zret == Z_OK);
83 return size;
84 }
85
86 void prefetch(unsigned char *sha1)
87 {
88 }
89
90 static int got_alternates = 0;
91
92 static int fetch_index(struct alt_base *repo, unsigned char *sha1)
93 {
94 char *filename;
95 char *url;
96
97 FILE *indexfile;
98
99 if (has_pack_index(sha1))
100 return 0;
101
102 if (get_verbosely)
103 fprintf(stderr, "Getting index for pack %s\n",
104 sha1_to_hex(sha1));
105
106 url = xmalloc(strlen(repo->base) + 64);
107 sprintf(url, "%s/objects/pack/pack-%s.idx",
108 repo->base, sha1_to_hex(sha1));
109
110 filename = sha1_pack_index_name(sha1);
111 indexfile = fopen(filename, "w");
112 if (!indexfile)
113 return error("Unable to open local file %s for pack index",
114 filename);
115
116 curl_easy_setopt(curl, CURLOPT_FILE, indexfile);
117 curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, fwrite);
118 curl_easy_setopt(curl, CURLOPT_URL, url);
119 curl_easy_setopt(curl, CURLOPT_HTTPHEADER, no_pragma_header);
120 curl_easy_setopt(curl, CURLOPT_ERRORBUFFER, curl_errorstr);
121
122 if (curl_easy_perform(curl)) {
123 fclose(indexfile);
124 return error("Unable to get pack index %s\n%s", url,
125 curl_errorstr);
126 }
127
128 fclose(indexfile);
129 return 0;
130 }
131
132 static int setup_index(struct alt_base *repo, unsigned char *sha1)
133 {
134 struct packed_git *new_pack;
135 if (has_pack_file(sha1))
136 return 0; // don't list this as something we can get
137
138 if (fetch_index(repo, sha1))
139 return -1;
140
141 new_pack = parse_pack_index(sha1);
142 new_pack->next = repo->packs;
143 repo->packs = new_pack;
144 return 0;
145 }
146
147 static int fetch_alternates(char *base)
148 {
149 int ret = 0;
150 struct buffer buffer;
151 char *url;
152 char *data;
153 int i = 0;
154 int http_specific = 1;
155 if (got_alternates)
156 return 0;
157 data = xmalloc(4096);
158 buffer.size = 4095;
159 buffer.posn = 0;
160 buffer.buffer = data;
161
162 if (get_verbosely)
163 fprintf(stderr, "Getting alternates list\n");
164
165 url = xmalloc(strlen(base) + 31);
166 sprintf(url, "%s/objects/info/http-alternates", base);
167
168 curl_easy_setopt(curl, CURLOPT_FILE, &buffer);
169 curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
170 curl_easy_setopt(curl, CURLOPT_URL, url);
171
172 if (curl_easy_perform(curl) || !buffer.posn) {
173 http_specific = 0;
174
175 sprintf(url, "%s/objects/info/alternates", base);
176
177 curl_easy_setopt(curl, CURLOPT_FILE, &buffer);
178 curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
179 curl_easy_setopt(curl, CURLOPT_URL, url);
180
181 if (curl_easy_perform(curl)) {
182 return 0;
183 }
184 }
185
186 data[buffer.posn] = '\0';
187
188 while (i < buffer.posn) {
189 int posn = i;
190 while (posn < buffer.posn && data[posn] != '\n')
191 posn++;
192 if (data[posn] == '\n') {
193 int okay = 0;
194 int serverlen = 0;
195 struct alt_base *newalt;
196 char *target = NULL;
197 if (data[i] == '/') {
198 serverlen = strchr(base + 8, '/') - base;
199 okay = 1;
200 } else if (!memcmp(data + i, "../", 3)) {
201 i += 3;
202 serverlen = strlen(base);
203 while (i + 2 < posn &&
204 !memcmp(data + i, "../", 3)) {
205 do {
206 serverlen--;
207 } while (serverlen &&
208 base[serverlen - 1] != '/');
209 i += 3;
210 }
211 // If the server got removed, give up.
212 okay = strchr(base, ':') - base + 3 <
213 serverlen;
214 } else if (http_specific) {
215 char *colon = strchr(data + i, ':');
216 char *slash = strchr(data + i, '/');
217 if (colon && slash && colon < data + posn &&
218 slash < data + posn && colon < slash) {
219 okay = 1;
220 }
221 }
222 // skip 'objects' at end
223 if (okay) {
224 target = xmalloc(serverlen + posn - i - 6);
225 strncpy(target, base, serverlen);
226 strncpy(target + serverlen, data + i,
227 posn - i - 7);
228 target[serverlen + posn - i - 7] = '\0';
229 if (get_verbosely)
230 fprintf(stderr,
231 "Also look at %s\n", target);
232 newalt = xmalloc(sizeof(*newalt));
233 newalt->next = alt;
234 newalt->base = target;
235 newalt->got_indices = 0;
236 newalt->packs = NULL;
237 alt = newalt;
238 ret++;
239 }
240 }
241 i = posn + 1;
242 }
243 got_alternates = 1;
244
245 return ret;
246 }
247
248 static int fetch_indices(struct alt_base *repo)
249 {
250 unsigned char sha1[20];
251 char *url;
252 struct buffer buffer;
253 char *data;
254 int i = 0;
255
256 if (repo->got_indices)
257 return 0;
258
259 data = xmalloc(4096);
260 buffer.size = 4096;
261 buffer.posn = 0;
262 buffer.buffer = data;
263
264 if (get_verbosely)
265 fprintf(stderr, "Getting pack list\n");
266
267 url = xmalloc(strlen(repo->base) + 21);
268 sprintf(url, "%s/objects/info/packs", repo->base);
269
270 curl_easy_setopt(curl, CURLOPT_FILE, &buffer);
271 curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
272 curl_easy_setopt(curl, CURLOPT_URL, url);
273 curl_easy_setopt(curl, CURLOPT_HTTPHEADER, NULL);
274 curl_easy_setopt(curl, CURLOPT_ERRORBUFFER, curl_errorstr);
275
276 if (curl_easy_perform(curl))
277 return error("%s", curl_errorstr);
278
279 while (i < buffer.posn) {
280 switch (data[i]) {
281 case 'P':
282 i++;
283 if (i + 52 < buffer.posn &&
284 !strncmp(data + i, " pack-", 6) &&
285 !strncmp(data + i + 46, ".pack\n", 6)) {
286 get_sha1_hex(data + i + 6, sha1);
287 setup_index(repo, sha1);
288 i += 51;
289 break;
290 }
291 default:
292 while (data[i] != '\n')
293 i++;
294 }
295 i++;
296 }
297
298 repo->got_indices = 1;
299 return 0;
300 }
301
302 static int fetch_pack(struct alt_base *repo, unsigned char *sha1)
303 {
304 char *url;
305 struct packed_git *target;
306 struct packed_git **lst;
307 FILE *packfile;
308 char *filename;
309
310 if (fetch_indices(repo))
311 return -1;
312 target = find_sha1_pack(sha1, repo->packs);
313 if (!target)
314 return -1;
315
316 if (get_verbosely) {
317 fprintf(stderr, "Getting pack %s\n",
318 sha1_to_hex(target->sha1));
319 fprintf(stderr, " which contains %s\n",
320 sha1_to_hex(sha1));
321 }
322
323 url = xmalloc(strlen(repo->base) + 65);
324 sprintf(url, "%s/objects/pack/pack-%s.pack",
325 repo->base, sha1_to_hex(target->sha1));
326
327 filename = sha1_pack_name(target->sha1);
328 packfile = fopen(filename, "w");
329 if (!packfile)
330 return error("Unable to open local file %s for pack",
331 filename);
332
333 curl_easy_setopt(curl, CURLOPT_FILE, packfile);
334 curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, fwrite);
335 curl_easy_setopt(curl, CURLOPT_URL, url);
336 curl_easy_setopt(curl, CURLOPT_HTTPHEADER, no_pragma_header);
337 curl_easy_setopt(curl, CURLOPT_ERRORBUFFER, curl_errorstr);
338
339 if (curl_easy_perform(curl)) {
340 fclose(packfile);
341 return error("Unable to get pack file %s\n%s", url,
342 curl_errorstr);
343 }
344
345 fclose(packfile);
346
347 lst = &repo->packs;
348 while (*lst != target)
349 lst = &((*lst)->next);
350 *lst = (*lst)->next;
351
352 install_packed_git(target);
353
354 return 0;
355 }
356
357 static int fetch_object(struct alt_base *repo, unsigned char *sha1)
358 {
359 char *hex = sha1_to_hex(sha1);
360 char *filename = sha1_file_name(sha1);
361 unsigned char real_sha1[20];
362 char tmpfile[PATH_MAX];
363 int ret;
364 char *url;
365 char *posn;
366
367 snprintf(tmpfile, sizeof(tmpfile), "%s/obj_XXXXXX",
368 get_object_directory());
369
370 local = mkstemp(tmpfile);
371 if (local < 0)
372 return error("Couldn't create temporary file %s for %s: %s\n",
373 tmpfile, filename, strerror(errno));
374
375 memset(&stream, 0, sizeof(stream));
376
377 inflateInit(&stream);
378
379 SHA1_Init(&c);
380
381 curl_easy_setopt(curl, CURLOPT_FAILONERROR, 1);
382 curl_easy_setopt(curl, CURLOPT_FILE, NULL);
383 curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, fwrite_sha1_file);
384 curl_easy_setopt(curl, CURLOPT_HTTPHEADER, no_pragma_header);
385 curl_easy_setopt(curl, CURLOPT_ERRORBUFFER, curl_errorstr);
386
387 url = xmalloc(strlen(repo->base) + 50);
388 strcpy(url, repo->base);
389 posn = url + strlen(repo->base);
390 strcpy(posn, "objects/");
391 posn += 8;
392 memcpy(posn, hex, 2);
393 posn += 2;
394 *(posn++) = '/';
395 strcpy(posn, hex + 2);
396
397 curl_easy_setopt(curl, CURLOPT_URL, url);
398
399 if (curl_easy_perform(curl)) {
400 unlink(filename);
401 return error("%s", curl_errorstr);
402 }
403
404 fchmod(local, 0444);
405 close(local);
406 inflateEnd(&stream);
407 SHA1_Final(real_sha1, &c);
408 if (zret != Z_STREAM_END) {
409 unlink(tmpfile);
410 return error("File %s (%s) corrupt\n", hex, url);
411 }
412 if (memcmp(sha1, real_sha1, 20)) {
413 unlink(tmpfile);
414 return error("File %s has bad hash\n", hex);
415 }
416 ret = link(tmpfile, filename);
417 if (ret < 0) {
418 /* Same Coda hack as in write_sha1_file(sha1_file.c) */
419 ret = errno;
420 if (ret == EXDEV && !rename(tmpfile, filename))
421 goto out;
422 }
423 unlink(tmpfile);
424 if (ret) {
425 if (ret != EEXIST)
426 return error("unable to write sha1 filename %s: %s",
427 filename, strerror(ret));
428 }
429 out:
430 pull_say("got %s\n", hex);
431 return 0;
432 }
433
434 int fetch(unsigned char *sha1)
435 {
436 struct alt_base *altbase = alt;
437 while (altbase) {
438 if (!fetch_object(altbase, sha1))
439 return 0;
440 if (!fetch_pack(altbase, sha1))
441 return 0;
442 if (fetch_alternates(altbase->base) > 0) {
443 altbase = alt;
444 continue;
445 }
446 altbase = altbase->next;
447 }
448 return error("Unable to find %s under %s\n", sha1_to_hex(sha1),
449 initial_base);
450 }
451
452 int fetch_ref(char *ref, unsigned char *sha1)
453 {
454 char *url, *posn;
455 char hex[42];
456 struct buffer buffer;
457 char *base = initial_base;
458 buffer.size = 41;
459 buffer.posn = 0;
460 buffer.buffer = hex;
461 hex[41] = '\0';
462
463 curl_easy_setopt(curl, CURLOPT_FILE, &buffer);
464 curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
465 curl_easy_setopt(curl, CURLOPT_HTTPHEADER, NULL);
466 curl_easy_setopt(curl, CURLOPT_ERRORBUFFER, curl_errorstr);
467
468 url = xmalloc(strlen(base) + 6 + strlen(ref));
469 strcpy(url, base);
470 posn = url + strlen(base);
471 strcpy(posn, "refs/");
472 posn += 5;
473 strcpy(posn, ref);
474
475 curl_easy_setopt(curl, CURLOPT_URL, url);
476
477 if (curl_easy_perform(curl))
478 return error("Couldn't get %s for %s\n%s",
479 url, ref, curl_errorstr);
480
481 hex[40] = '\0';
482 get_sha1_hex(hex, sha1);
483 return 0;
484 }
485
486 int main(int argc, char **argv)
487 {
488 char *commit_id;
489 char *url;
490 int arg = 1;
491
492 while (arg < argc && argv[arg][0] == '-') {
493 if (argv[arg][1] == 't') {
494 get_tree = 1;
495 } else if (argv[arg][1] == 'c') {
496 get_history = 1;
497 } else if (argv[arg][1] == 'a') {
498 get_all = 1;
499 get_tree = 1;
500 get_history = 1;
501 } else if (argv[arg][1] == 'v') {
502 get_verbosely = 1;
503 } else if (argv[arg][1] == 'w') {
504 write_ref = argv[arg + 1];
505 arg++;
506 } else if (!strcmp(argv[arg], "--recover")) {
507 get_recover = 1;
508 }
509 arg++;
510 }
511 if (argc < arg + 2) {
512 usage("git-http-fetch [-c] [-t] [-a] [-d] [-v] [--recover] [-w ref] commit-id url");
513 return 1;
514 }
515 commit_id = argv[arg];
516 url = argv[arg + 1];
517
518 curl_global_init(CURL_GLOBAL_ALL);
519
520 curl = curl_easy_init();
521 no_pragma_header = curl_slist_append(no_pragma_header, "Pragma:");
522
523 curl_ssl_verify = getenv("GIT_SSL_NO_VERIFY") ? 0 : 1;
524 curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, curl_ssl_verify);
525 #if LIBCURL_VERSION_NUM >= 0x070907
526 curl_easy_setopt(curl, CURLOPT_NETRC, CURL_NETRC_OPTIONAL);
527 #endif
528
529 if ((ssl_cert = getenv("GIT_SSL_CERT")) != NULL) {
530 curl_easy_setopt(curl, CURLOPT_SSLCERT, ssl_cert);
531 }
532 if ((ssl_key = getenv("GIT_SSL_KEY")) != NULL) {
533 curl_easy_setopt(curl, CURLOPT_SSLKEY, ssl_key);
534 }
535 #if LIBCURL_VERSION_NUM >= 0x070908
536 if ((ssl_capath = getenv("GIT_SSL_CAPATH")) != NULL) {
537 curl_easy_setopt(curl, CURLOPT_CAPATH, ssl_capath);
538 }
539 #endif
540 if ((ssl_cainfo = getenv("GIT_SSL_CAINFO")) != NULL) {
541 curl_easy_setopt(curl, CURLOPT_CAINFO, ssl_cainfo);
542 }
543
544 alt = xmalloc(sizeof(*alt));
545 alt->base = url;
546 alt->got_indices = 0;
547 alt->packs = NULL;
548 alt->next = NULL;
549 initial_base = url;
550
551 if (pull(commit_id))
552 return 1;
553
554 curl_slist_free_all(no_pragma_header);
555 curl_global_cleanup();
556 return 0;
557 }