t5801: skip without hg
[git/dscho.git] / http-walker.c
blob51a906e9e3316582561304995e1a1bbbdcd6ca7c
1 #include "cache.h"
2 #include "commit.h"
3 #include "walker.h"
4 #include "http.h"
6 struct alt_base {
7         char *base;
8         int got_indices;
9         struct packed_git *packs;
10         struct alt_base *next;
13 enum object_request_state {
14         WAITING,
15         ABORTED,
16         ACTIVE,
17         COMPLETE
20 struct object_request {
21         struct walker *walker;
22         unsigned char sha1[20];
23         struct alt_base *repo;
24         enum object_request_state state;
25         struct http_object_request *req;
26         struct object_request *next;
29 struct alternates_request {
30         struct walker *walker;
31         const char *base;
32         char *url;
33         struct strbuf *buffer;
34         struct active_request_slot *slot;
35         int http_specific;
38 struct walker_data {
39         const char *url;
40         int got_alternates;
41         struct alt_base *alt;
44 static struct object_request *object_queue_head;
46 static void fetch_alternates(struct walker *walker, const char *base);
48 static void process_object_response(void *callback_data);
50 static void start_object_request(struct walker *walker,
51                                  struct object_request *obj_req)
53         struct active_request_slot *slot;
54         struct http_object_request *req;
56         req = new_http_object_request(obj_req->repo->base, obj_req->sha1);
57         if (req == NULL) {
58                 obj_req->state = ABORTED;
59                 return;
60         }
61         obj_req->req = req;
63         slot = req->slot;
64         slot->callback_func = process_object_response;
65         slot->callback_data = obj_req;
67         /* Try to get the request started, abort the request on error */
68         obj_req->state = ACTIVE;
69         if (!start_active_slot(slot)) {
70                 obj_req->state = ABORTED;
71                 release_http_object_request(req);
72                 return;
73         }
76 static void finish_object_request(struct object_request *obj_req)
78         if (finish_http_object_request(obj_req->req))
79                 return;
81         if (obj_req->req->rename == 0)
82                 walker_say(obj_req->walker, "got %s\n", sha1_to_hex(obj_req->sha1));
85 static void process_object_response(void *callback_data)
87         struct object_request *obj_req =
88                 (struct object_request *)callback_data;
89         struct walker *walker = obj_req->walker;
90         struct walker_data *data = walker->data;
91         struct alt_base *alt = data->alt;
93         process_http_object_request(obj_req->req);
94         obj_req->state = COMPLETE;
96         /* Use alternates if necessary */
97         if (missing_target(obj_req->req)) {
98                 fetch_alternates(walker, alt->base);
99                 if (obj_req->repo->next != NULL) {
100                         obj_req->repo =
101                                 obj_req->repo->next;
102                         release_http_object_request(obj_req->req);
103                         start_object_request(walker, obj_req);
104                         return;
105                 }
106         }
108         finish_object_request(obj_req);
111 static void release_object_request(struct object_request *obj_req)
113         struct object_request *entry = object_queue_head;
115         if (obj_req->req !=NULL && obj_req->req->localfile != -1)
116                 error("fd leakage in release: %d", obj_req->req->localfile);
117         if (obj_req == object_queue_head) {
118                 object_queue_head = obj_req->next;
119         } else {
120                 while (entry->next != NULL && entry->next != obj_req)
121                         entry = entry->next;
122                 if (entry->next == obj_req)
123                         entry->next = entry->next->next;
124         }
126         free(obj_req);
129 #ifdef USE_CURL_MULTI
130 static int fill_active_slot(struct walker *walker)
132         struct object_request *obj_req;
134         for (obj_req = object_queue_head; obj_req; obj_req = obj_req->next) {
135                 if (obj_req->state == WAITING) {
136                         if (has_sha1_file(obj_req->sha1))
137                                 obj_req->state = COMPLETE;
138                         else {
139                                 start_object_request(walker, obj_req);
140                                 return 1;
141                         }
142                 }
143         }
144         return 0;
146 #endif
148 static void prefetch(struct walker *walker, unsigned char *sha1)
150         struct object_request *newreq;
151         struct object_request *tail;
152         struct walker_data *data = walker->data;
154         newreq = xmalloc(sizeof(*newreq));
155         newreq->walker = walker;
156         hashcpy(newreq->sha1, sha1);
157         newreq->repo = data->alt;
158         newreq->state = WAITING;
159         newreq->req = NULL;
160         newreq->next = NULL;
162         http_is_verbose = walker->get_verbosely;
164         if (object_queue_head == NULL) {
165                 object_queue_head = newreq;
166         } else {
167                 tail = object_queue_head;
168                 while (tail->next != NULL)
169                         tail = tail->next;
170                 tail->next = newreq;
171         }
173 #ifdef USE_CURL_MULTI
174         fill_active_slots();
175         step_active_slots();
176 #endif
179 static void process_alternates_response(void *callback_data)
181         struct alternates_request *alt_req =
182                 (struct alternates_request *)callback_data;
183         struct walker *walker = alt_req->walker;
184         struct walker_data *cdata = walker->data;
185         struct active_request_slot *slot = alt_req->slot;
186         struct alt_base *tail = cdata->alt;
187         const char *base = alt_req->base;
188         const char null_byte = '\0';
189         char *data;
190         int i = 0;
192         if (alt_req->http_specific) {
193                 if (slot->curl_result != CURLE_OK ||
194                     !alt_req->buffer->len) {
196                         /* Try reusing the slot to get non-http alternates */
197                         alt_req->http_specific = 0;
198                         sprintf(alt_req->url, "%s/objects/info/alternates",
199                                 base);
200                         curl_easy_setopt(slot->curl, CURLOPT_URL,
201                                          alt_req->url);
202                         active_requests++;
203                         slot->in_use = 1;
204                         if (slot->finished != NULL)
205                                 (*slot->finished) = 0;
206                         if (!start_active_slot(slot)) {
207                                 cdata->got_alternates = -1;
208                                 slot->in_use = 0;
209                                 if (slot->finished != NULL)
210                                         (*slot->finished) = 1;
211                         }
212                         return;
213                 }
214         } else if (slot->curl_result != CURLE_OK) {
215                 if (!missing_target(slot)) {
216                         cdata->got_alternates = -1;
217                         return;
218                 }
219         }
221         fwrite_buffer((char *)&null_byte, 1, 1, alt_req->buffer);
222         alt_req->buffer->len--;
223         data = alt_req->buffer->buf;
225         while (i < alt_req->buffer->len) {
226                 int posn = i;
227                 while (posn < alt_req->buffer->len && data[posn] != '\n')
228                         posn++;
229                 if (data[posn] == '\n') {
230                         int okay = 0;
231                         int serverlen = 0;
232                         struct alt_base *newalt;
233                         char *target = NULL;
234                         if (data[i] == '/') {
235                                 /*
236                                  * This counts
237                                  * http://git.host/pub/scm/linux.git/
238                                  * -----------here^
239                                  * so memcpy(dst, base, serverlen) will
240                                  * copy up to "...git.host".
241                                  */
242                                 const char *colon_ss = strstr(base,"://");
243                                 if (colon_ss) {
244                                         serverlen = (strchr(colon_ss + 3, '/')
245                                                      - base);
246                                         okay = 1;
247                                 }
248                         } else if (!memcmp(data + i, "../", 3)) {
249                                 /*
250                                  * Relative URL; chop the corresponding
251                                  * number of subpath from base (and ../
252                                  * from data), and concatenate the result.
253                                  *
254                                  * The code first drops ../ from data, and
255                                  * then drops one ../ from data and one path
256                                  * from base.  IOW, one extra ../ is dropped
257                                  * from data than path is dropped from base.
258                                  *
259                                  * This is not wrong.  The alternate in
260                                  *     http://git.host/pub/scm/linux.git/
261                                  * to borrow from
262                                  *     http://git.host/pub/scm/linus.git/
263                                  * is ../../linus.git/objects/.  You need
264                                  * two ../../ to borrow from your direct
265                                  * neighbour.
266                                  */
267                                 i += 3;
268                                 serverlen = strlen(base);
269                                 while (i + 2 < posn &&
270                                        !memcmp(data + i, "../", 3)) {
271                                         do {
272                                                 serverlen--;
273                                         } while (serverlen &&
274                                                  base[serverlen - 1] != '/');
275                                         i += 3;
276                                 }
277                                 /* If the server got removed, give up. */
278                                 okay = strchr(base, ':') - base + 3 <
279                                        serverlen;
280                         } else if (alt_req->http_specific) {
281                                 char *colon = strchr(data + i, ':');
282                                 char *slash = strchr(data + i, '/');
283                                 if (colon && slash && colon < data + posn &&
284                                     slash < data + posn && colon < slash) {
285                                         okay = 1;
286                                 }
287                         }
288                         /* skip "objects\n" at end */
289                         if (okay) {
290                                 target = xmalloc(serverlen + posn - i - 6);
291                                 memcpy(target, base, serverlen);
292                                 memcpy(target + serverlen, data + i,
293                                        posn - i - 7);
294                                 target[serverlen + posn - i - 7] = 0;
295                                 if (walker->get_verbosely)
296                                         fprintf(stderr,
297                                                 "Also look at %s\n", target);
298                                 newalt = xmalloc(sizeof(*newalt));
299                                 newalt->next = NULL;
300                                 newalt->base = target;
301                                 newalt->got_indices = 0;
302                                 newalt->packs = NULL;
304                                 while (tail->next != NULL)
305                                         tail = tail->next;
306                                 tail->next = newalt;
307                         }
308                 }
309                 i = posn + 1;
310         }
312         cdata->got_alternates = 1;
315 static void fetch_alternates(struct walker *walker, const char *base)
317         struct strbuf buffer = STRBUF_INIT;
318         char *url;
319         struct active_request_slot *slot;
320         struct alternates_request alt_req;
321         struct walker_data *cdata = walker->data;
323         /*
324          * If another request has already started fetching alternates,
325          * wait for them to arrive and return to processing this request's
326          * curl message
327          */
328 #ifdef USE_CURL_MULTI
329         while (cdata->got_alternates == 0) {
330                 step_active_slots();
331         }
332 #endif
334         /* Nothing to do if they've already been fetched */
335         if (cdata->got_alternates == 1)
336                 return;
338         /* Start the fetch */
339         cdata->got_alternates = 0;
341         if (walker->get_verbosely)
342                 fprintf(stderr, "Getting alternates list for %s\n", base);
344         url = xmalloc(strlen(base) + 31);
345         sprintf(url, "%s/objects/info/http-alternates", base);
347         /*
348          * Use a callback to process the result, since another request
349          * may fail and need to have alternates loaded before continuing
350          */
351         slot = get_active_slot();
352         slot->callback_func = process_alternates_response;
353         alt_req.walker = walker;
354         slot->callback_data = &alt_req;
356         curl_easy_setopt(slot->curl, CURLOPT_FILE, &buffer);
357         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
358         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
360         alt_req.base = base;
361         alt_req.url = url;
362         alt_req.buffer = &buffer;
363         alt_req.http_specific = 1;
364         alt_req.slot = slot;
366         if (start_active_slot(slot))
367                 run_active_slot(slot);
368         else
369                 cdata->got_alternates = -1;
371         strbuf_release(&buffer);
372         free(url);
375 static int fetch_indices(struct walker *walker, struct alt_base *repo)
377         int ret;
379         if (repo->got_indices)
380                 return 0;
382         if (walker->get_verbosely)
383                 fprintf(stderr, "Getting pack list for %s\n", repo->base);
385         switch (http_get_info_packs(repo->base, &repo->packs)) {
386         case HTTP_OK:
387         case HTTP_MISSING_TARGET:
388                 repo->got_indices = 1;
389                 ret = 0;
390                 break;
391         default:
392                 repo->got_indices = 0;
393                 ret = -1;
394         }
396         return ret;
399 static int fetch_pack(struct walker *walker, struct alt_base *repo, unsigned char *sha1)
401         struct packed_git *target;
402         int ret;
403         struct slot_results results;
404         struct http_pack_request *preq;
406         if (fetch_indices(walker, repo))
407                 return -1;
408         target = find_sha1_pack(sha1, repo->packs);
409         if (!target)
410                 return -1;
412         if (walker->get_verbosely) {
413                 fprintf(stderr, "Getting pack %s\n",
414                         sha1_to_hex(target->sha1));
415                 fprintf(stderr, " which contains %s\n",
416                         sha1_to_hex(sha1));
417         }
419         preq = new_http_pack_request(target, repo->base);
420         if (preq == NULL)
421                 goto abort;
422         preq->lst = &repo->packs;
423         preq->slot->results = &results;
425         if (start_active_slot(preq->slot)) {
426                 run_active_slot(preq->slot);
427                 if (results.curl_result != CURLE_OK) {
428                         error("Unable to get pack file %s\n%s", preq->url,
429                               curl_errorstr);
430                         goto abort;
431                 }
432         } else {
433                 error("Unable to start request");
434                 goto abort;
435         }
437         ret = finish_http_pack_request(preq);
438         release_http_pack_request(preq);
439         if (ret)
440                 return ret;
442         return 0;
444 abort:
445         return -1;
448 static void abort_object_request(struct object_request *obj_req)
450         release_object_request(obj_req);
453 static int fetch_object(struct walker *walker, struct alt_base *repo, unsigned char *sha1)
455         char *hex = sha1_to_hex(sha1);
456         int ret = 0;
457         struct object_request *obj_req = object_queue_head;
458         struct http_object_request *req;
460         while (obj_req != NULL && hashcmp(obj_req->sha1, sha1))
461                 obj_req = obj_req->next;
462         if (obj_req == NULL)
463                 return error("Couldn't find request for %s in the queue", hex);
465         if (has_sha1_file(obj_req->sha1)) {
466                 if (obj_req->req != NULL)
467                         abort_http_object_request(obj_req->req);
468                 abort_object_request(obj_req);
469                 return 0;
470         }
472 #ifdef USE_CURL_MULTI
473         while (obj_req->state == WAITING)
474                 step_active_slots();
475 #else
476         start_object_request(walker, obj_req);
477 #endif
479         /*
480          * obj_req->req might change when fetching alternates in the callback
481          * process_object_response; therefore, the "shortcut" variable, req,
482          * is used only after we're done with slots.
483          */
484         while (obj_req->state == ACTIVE)
485                 run_active_slot(obj_req->req->slot);
487         req = obj_req->req;
489         if (req->localfile != -1) {
490                 close(req->localfile);
491                 req->localfile = -1;
492         }
494         if (obj_req->state == ABORTED) {
495                 ret = error("Request for %s aborted", hex);
496         } else if (req->curl_result != CURLE_OK &&
497                    req->http_code != 416) {
498                 if (missing_target(req))
499                         ret = -1; /* Be silent, it is probably in a pack. */
500                 else
501                         ret = error("%s (curl_result = %d, http_code = %ld, sha1 = %s)",
502                                     req->errorstr, req->curl_result,
503                                     req->http_code, hex);
504         } else if (req->zret != Z_STREAM_END) {
505                 walker->corrupt_object_found++;
506                 ret = error("File %s (%s) corrupt", hex, req->url);
507         } else if (hashcmp(obj_req->sha1, req->real_sha1)) {
508                 ret = error("File %s has bad hash", hex);
509         } else if (req->rename < 0) {
510                 ret = error("unable to write sha1 filename %s",
511                             sha1_file_name(req->sha1));
512         }
514         release_http_object_request(req);
515         release_object_request(obj_req);
516         return ret;
519 static int fetch(struct walker *walker, unsigned char *sha1)
521         struct walker_data *data = walker->data;
522         struct alt_base *altbase = data->alt;
524         if (!fetch_object(walker, altbase, sha1))
525                 return 0;
526         while (altbase) {
527                 if (!fetch_pack(walker, altbase, sha1))
528                         return 0;
529                 fetch_alternates(walker, data->alt->base);
530                 altbase = altbase->next;
531         }
532         return error("Unable to find %s under %s", sha1_to_hex(sha1),
533                      data->alt->base);
536 static int fetch_ref(struct walker *walker, struct ref *ref)
538         struct walker_data *data = walker->data;
539         return http_fetch_ref(data->alt->base, ref);
542 static void cleanup(struct walker *walker)
544         struct walker_data *data = walker->data;
545         struct alt_base *alt, *alt_next;
547         if (data) {
548                 alt = data->alt;
549                 while (alt) {
550                         alt_next = alt->next;
552                         free(alt->base);
553                         free(alt);
555                         alt = alt_next;
556                 }
557                 free(data);
558                 walker->data = NULL;
559         }
562 struct walker *get_http_walker(const char *url)
564         char *s;
565         struct walker_data *data = xmalloc(sizeof(struct walker_data));
566         struct walker *walker = xmalloc(sizeof(struct walker));
568         data->alt = xmalloc(sizeof(*data->alt));
569         data->alt->base = xmalloc(strlen(url) + 1);
570         strcpy(data->alt->base, url);
571         for (s = data->alt->base + strlen(data->alt->base) - 1; *s == '/'; --s)
572                 *s = 0;
574         data->alt->got_indices = 0;
575         data->alt->packs = NULL;
576         data->alt->next = NULL;
577         data->got_alternates = -1;
579         walker->corrupt_object_found = 0;
580         walker->fetch = fetch;
581         walker->fetch_ref = fetch_ref;
582         walker->prefetch = prefetch;
583         walker->cleanup = cleanup;
584         walker->data = data;
586 #ifdef USE_CURL_MULTI
587         add_fill_function(walker, (int (*)(void *)) fill_active_slot);
588 #endif
590         return walker;