transport.c

   1 #include "cache.h"
   2 #include "transport.h"
   3 #include "run-command.h"
   4 #include "http.h"
   5 #include "pkt-line.h"
   6 #include "fetch-pack.h"
   7 #include "walker.h"
   8 #include "bundle.h"
   9
  10 /* Generic functions for using commit walkers */
  11
  12 static int fetch_objs_via_walker(struct transport *transport,
  13                                  int nr_objs, struct ref **to_fetch)
  14 {
  15         char *dest = xstrdup(transport->url);
  16         struct walker *walker = transport->data;
  17         char **objs = xmalloc(nr_objs * sizeof(*objs));
  18         int i;
  19
  20         walker->get_all = 1;
  21         walker->get_tree = 1;
  22         walker->get_history = 1;
  23         walker->get_verbosely = transport->verbose;
  24         walker->get_recover = 0;
  25
  26         for (i = 0; i < nr_objs; i++)
  27                 objs[i] = xstrdup(sha1_to_hex(to_fetch[i]->old_sha1));
  28
  29         if (walker_fetch(walker, nr_objs, objs, NULL, NULL))
  30                 die("Fetch failed.");
  31
  32         for (i = 0; i < nr_objs; i++)
  33                 free(objs[i]);
  34         free(objs);
  35         free(dest);
  36         return 0;
  37 }
  38
  39 static int disconnect_walker(struct transport *transport)
  40 {
  41         struct walker *walker = transport->data;
  42         if (walker)
  43                 walker_free(walker);
  44         return 0;
  45 }
  46
  47 static const struct transport_ops rsync_transport;
  48
  49 static int curl_transport_push(struct transport *transport, int refspec_nr, const char **refspec, int flags) {
  50         const char **argv;
  51         int argc;
  52         int err;
  53
  54         argv = xmalloc((refspec_nr + 11) * sizeof(char *));
  55         argv[0] = "http-push";
  56         argc = 1;
  57         if (flags & TRANSPORT_PUSH_ALL)
  58                 argv[argc++] = "--all";
  59         if (flags & TRANSPORT_PUSH_FORCE)
  60                 argv[argc++] = "--force";
  61         argv[argc++] = transport->url;
  62         while (refspec_nr--)
  63                 argv[argc++] = *refspec++;
  64         argv[argc] = NULL;
  65         err = run_command_v_opt(argv, RUN_GIT_CMD);
  66         switch (err) {
  67         case -ERR_RUN_COMMAND_FORK:
  68                 error("unable to fork for %s", argv[0]);
  69         case -ERR_RUN_COMMAND_EXEC:
  70                 error("unable to exec %s", argv[0]);
  71                 break;
  72         case -ERR_RUN_COMMAND_WAITPID:
  73         case -ERR_RUN_COMMAND_WAITPID_WRONG_PID:
  74         case -ERR_RUN_COMMAND_WAITPID_SIGNAL:
  75         case -ERR_RUN_COMMAND_WAITPID_NOEXIT:
  76                 error("%s died with strange error", argv[0]);
  77         }
  78         return !!err;
  79 }
  80
  81 #ifndef NO_CURL
  82 static int missing__target(int code, int result)
  83 {
  84         return  /* file:// URL -- do we ever use one??? */
  85                 (result == CURLE_FILE_COULDNT_READ_FILE) ||
  86                 /* http:// and https:// URL */
  87                 (code == 404 && result == CURLE_HTTP_RETURNED_ERROR) ||
  88                 /* ftp:// URL */
  89                 (code == 550 && result == CURLE_FTP_COULDNT_RETR_FILE)
  90                 ;
  91 }
  92
  93 #define missing_target(a) missing__target((a)->http_code, (a)->curl_result)
  94
  95 static struct ref *get_refs_via_curl(const struct transport *transport)
  96 {
  97         struct buffer buffer;
  98         char *data, *start, *mid;
  99         char *ref_name;
 100         char *refs_url;
 101         int i = 0;
 102
 103         struct active_request_slot *slot;
 104         struct slot_results results;
 105
 106         struct ref *refs = NULL;
 107         struct ref *ref = NULL;
 108         struct ref *last_ref = NULL;
 109
 110         data = xmalloc(4096);
 111         buffer.size = 4096;
 112         buffer.posn = 0;
 113         buffer.buffer = data;
 114
 115         refs_url = xmalloc(strlen(transport->url) + 11);
 116         sprintf(refs_url, "%s/info/refs", transport->url);
 117
 118         http_init();
 119
 120         slot = get_active_slot();
 121         slot->results = &results;
 122         curl_easy_setopt(slot->curl, CURLOPT_FILE, &buffer);
 123         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
 124         curl_easy_setopt(slot->curl, CURLOPT_URL, refs_url);
 125         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, NULL);
 126         if (start_active_slot(slot)) {
 127                 run_active_slot(slot);
 128                 if (results.curl_result != CURLE_OK) {
 129                         if (missing_target(&results)) {
 130                                 free(buffer.buffer);
 131                                 return NULL;
 132                         } else {
 133                                 free(buffer.buffer);
 134                                 error("%s", curl_errorstr);
 135                                 return NULL;
 136                         }
 137                 }
 138         } else {
 139                 free(buffer.buffer);
 140                 error("Unable to start request");
 141                 return NULL;
 142         }
 143
 144         http_cleanup();
 145
 146         data = buffer.buffer;
 147         start = NULL;
 148         mid = data;
 149         while (i < buffer.posn) {
 150                 if (!start)
 151                         start = &data[i];
 152                 if (data[i] == '\t')
 153                         mid = &data[i];
 154                 if (data[i] == '\n') {
 155                         data[i] = 0;
 156                         ref_name = mid + 1;
 157                         ref = xmalloc(sizeof(struct ref) +
 158                                       strlen(ref_name) + 1);
 159                         memset(ref, 0, sizeof(struct ref));
 160                         strcpy(ref->name, ref_name);
 161                         get_sha1_hex(start, ref->old_sha1);
 162                         if (!refs)
 163                                 refs = ref;
 164                         if (last_ref)
 165                                 last_ref->next = ref;
 166                         last_ref = ref;
 167                         start = NULL;
 168                 }
 169                 i++;
 170         }
 171
 172         free(buffer.buffer);
 173
 174         return refs;
 175 }
 176
 177 static int fetch_objs_via_curl(struct transport *transport,
 178                                  int nr_objs, struct ref **to_fetch)
 179 {
 180         if (!transport->data)
 181                 transport->data = get_http_walker(transport->url);
 182         return fetch_objs_via_walker(transport, nr_objs, to_fetch);
 183 }
 184
 185 #else
 186
 187 static struct ref *get_refs_via_curl(const struct transport *transport)
 188 {
 189         die("Cannot fetch from '%s' without curl ...", transport->url);
 190         return NULL;
 191 }
 192
 193 static int fetch_objs_via_curl(struct transport *transport,
 194                                  int nr_objs, struct ref **to_fetch)
 195 {
 196         die("Cannot fetch from '%s' without curl ...", transport->url);
 197         return -1;
 198 }
 199
 200 #endif
 201
 202 static const struct transport_ops curl_transport = {
 203         /* set_option */        NULL,
 204         /* get_refs_list */     get_refs_via_curl,
 205         /* fetch */             fetch_objs_via_curl,
 206         /* push */              curl_transport_push,
 207         /* disconnect */        disconnect_walker
 208 };
 209
 210 struct bundle_transport_data {
 211         int fd;
 212         struct bundle_header header;
 213 };
 214
 215 static struct ref *get_refs_from_bundle(const struct transport *transport)
 216 {
 217         struct bundle_transport_data *data = transport->data;
 218         struct ref *result = NULL;
 219         int i;
 220
 221         if (data->fd > 0)
 222                 close(data->fd);
 223         data->fd = read_bundle_header(transport->url, &data->header);
 224         if (data->fd < 0)
 225                 die ("Could not read bundle '%s'.", transport->url);
 226         for (i = 0; i < data->header.references.nr; i++) {
 227                 struct ref_list_entry *e = data->header.references.list + i;
 228                 struct ref *ref = alloc_ref(strlen(e->name));
 229                 hashcpy(ref->old_sha1, e->sha1);
 230                 strcpy(ref->name, e->name);
 231                 ref->next = result;
 232                 result = ref;
 233         }
 234         return result;
 235 }
 236
 237 static int fetch_refs_from_bundle(struct transport *transport,
 238                                int nr_heads, struct ref **to_fetch)
 239 {
 240         struct bundle_transport_data *data = transport->data;
 241         return unbundle(&data->header, data->fd);
 242 }
 243
 244 static int close_bundle(struct transport *transport)
 245 {
 246         struct bundle_transport_data *data = transport->data;
 247         if (data->fd > 0)
 248                 close(data->fd);
 249         return 0;
 250 }
 251
 252 static const struct transport_ops bundle_transport = {
 253         /* set_option */        NULL,
 254         /* get_refs_list */     get_refs_from_bundle,
 255         /* fetch */             fetch_refs_from_bundle,
 256         /* push */              NULL,
 257         /* disconnect */        close_bundle
 258 };
 259
 260 struct git_transport_data {
 261         unsigned thin : 1;
 262         unsigned keep : 1;
 263
 264         int unpacklimit;
 265
 266         int depth;
 267
 268         const char *uploadpack;
 269         const char *receivepack;
 270 };
 271
 272 static int set_git_option(struct transport *connection,
 273                           const char *name, const char *value)
 274 {
 275         struct git_transport_data *data = connection->data;
 276         if (!strcmp(name, TRANS_OPT_UPLOADPACK)) {
 277                 data->uploadpack = value;
 278                 return 0;
 279         } else if (!strcmp(name, TRANS_OPT_RECEIVEPACK)) {
 280                 data->receivepack = value;
 281                 return 0;
 282         } else if (!strcmp(name, TRANS_OPT_THIN)) {
 283                 data->thin = !!value;
 284                 return 0;
 285         } else if (!strcmp(name, TRANS_OPT_KEEP)) {
 286                 data->keep = !!value;
 287                 return 0;
 288         } else if (!strcmp(name, TRANS_OPT_UNPACKLIMIT)) {
 289                 data->unpacklimit = atoi(value);
 290                 return 0;
 291         } else if (!strcmp(name, TRANS_OPT_DEPTH)) {
 292                 if (!value)
 293                         data->depth = 0;
 294                 else
 295                         data->depth = atoi(value);
 296                 return 0;
 297         }
 298         return 1;
 299 }
 300
 301 static struct ref *get_refs_via_connect(const struct transport *transport)
 302 {
 303         struct git_transport_data *data = transport->data;
 304         struct ref *refs;
 305         int fd[2];
 306         pid_t pid;
 307         char *dest = xstrdup(transport->url);
 308
 309         pid = git_connect(fd, dest, data->uploadpack, 0);
 310
 311         if (pid < 0)
 312                 die("Failed to connect to \"%s\"", transport->url);
 313
 314         get_remote_heads(fd[0], &refs, 0, NULL, 0);
 315         packet_flush(fd[1]);
 316
 317         finish_connect(pid);
 318
 319         free(dest);
 320
 321         return refs;
 322 }
 323
 324 static int fetch_refs_via_pack(struct transport *transport,
 325                                int nr_heads, struct ref **to_fetch)
 326 {
 327         struct git_transport_data *data = transport->data;
 328         char **heads = xmalloc(nr_heads * sizeof(*heads));
 329         char **origh = xmalloc(nr_heads * sizeof(*origh));
 330         struct ref *refs;
 331         char *dest = xstrdup(transport->url);
 332         struct fetch_pack_args args;
 333         int i;
 334
 335         args.uploadpack = data->uploadpack;
 336         args.quiet = 0;
 337         args.keep_pack = data->keep;
 338         args.unpacklimit = data->unpacklimit;
 339         args.use_thin_pack = data->thin;
 340         args.fetch_all = 0;
 341         args.verbose = transport->verbose;
 342         args.depth = data->depth;
 343         args.no_progress = 0;
 344
 345         setup_fetch_pack(&args);
 346
 347         for (i = 0; i < nr_heads; i++)
 348                 origh[i] = heads[i] = xstrdup(to_fetch[i]->name);
 349         refs = fetch_pack(dest, nr_heads, heads, &transport->pack_lockfile);
 350
 351         for (i = 0; i < nr_heads; i++)
 352                 free(origh[i]);
 353         free(origh);
 354         free(heads);
 355         free_refs(refs);
 356         free(dest);
 357         return 0;
 358 }
 359
 360 static int git_transport_push(struct transport *transport, int refspec_nr, const char **refspec, int flags) {
 361         struct git_transport_data *data = transport->data;
 362         const char **argv;
 363         char *rem;
 364         int argc;
 365         int err;
 366
 367         argv = xmalloc((refspec_nr + 11) * sizeof(char *));
 368         argv[0] = "send-pack";
 369         argc = 1;
 370         if (flags & TRANSPORT_PUSH_ALL)
 371                 argv[argc++] = "--all";
 372         if (flags & TRANSPORT_PUSH_FORCE)
 373                 argv[argc++] = "--force";
 374         if (data->receivepack) {
 375                 char *rp = xmalloc(strlen(data->receivepack) + 16);
 376                 sprintf(rp, "--receive-pack=%s", data->receivepack);
 377                 argv[argc++] = rp;
 378         }
 379         if (data->thin)
 380                 argv[argc++] = "--thin";
 381         rem = xmalloc(strlen(transport->remote->name) + 10);
 382         sprintf(rem, "--remote=%s", transport->remote->name);
 383         argv[argc++] = rem;
 384         argv[argc++] = transport->url;
 385         while (refspec_nr--)
 386                 argv[argc++] = *refspec++;
 387         argv[argc] = NULL;
 388         err = run_command_v_opt(argv, RUN_GIT_CMD);
 389         switch (err) {
 390         case -ERR_RUN_COMMAND_FORK:
 391                 error("unable to fork for %s", argv[0]);
 392         case -ERR_RUN_COMMAND_EXEC:
 393                 error("unable to exec %s", argv[0]);
 394                 break;
 395         case -ERR_RUN_COMMAND_WAITPID:
 396         case -ERR_RUN_COMMAND_WAITPID_WRONG_PID:
 397         case -ERR_RUN_COMMAND_WAITPID_SIGNAL:
 398         case -ERR_RUN_COMMAND_WAITPID_NOEXIT:
 399                 error("%s died with strange error", argv[0]);
 400         }
 401         return !!err;
 402 }
 403
 404 static const struct transport_ops git_transport = {
 405         /* set_option */        set_git_option,
 406         /* get_refs_list */     get_refs_via_connect,
 407         /* fetch */             fetch_refs_via_pack,
 408         /* push */              git_transport_push
 409 };
 410
 411 static int is_local(const char *url)
 412 {
 413         const char *colon = strchr(url, ':');
 414         const char *slash = strchr(url, '/');
 415         return !colon || (slash && slash < colon);
 416 }
 417
 418 static int is_file(const char *url)
 419 {
 420         struct stat buf;
 421         if (stat(url, &buf))
 422                 return 0;
 423         return S_ISREG(buf.st_mode);
 424 }
 425
 426 struct transport *transport_get(struct remote *remote, const char *url)
 427 {
 428         struct transport *ret = xcalloc(1, sizeof(*ret));
 429
 430         ret->remote = remote;
 431         ret->url = url;
 432
 433         if (!prefixcmp(url, "rsync://")) {
 434                 ret->ops = &rsync_transport;
 435         } else if (!prefixcmp(url, "http://")
 436                 || !prefixcmp(url, "https://")
 437                 || !prefixcmp(url, "ftp://")) {
 438                 ret->ops = &curl_transport;
 439         } else if (is_local(url) && is_file(url)) {
 440                 struct bundle_transport_data *data = xcalloc(1, sizeof(*data));
 441                 ret->data = data;
 442                 ret->ops = &bundle_transport;
 443         } else {
 444                 struct git_transport_data *data = xcalloc(1, sizeof(*data));
 445                 ret->data = data;
 446                 data->thin = 1;
 447                 data->uploadpack = "git-upload-pack";
 448                 if (remote && remote->uploadpack)
 449                         data->uploadpack = remote->uploadpack;
 450                 data->receivepack = "git-receive-pack";
 451                 if (remote && remote->receivepack)
 452                         data->receivepack = remote->receivepack;
 453                 data->unpacklimit = -1;
 454                 ret->ops = &git_transport;
 455         }
 456
 457         return ret;
 458 }
 459
 460 int transport_set_option(struct transport *transport,
 461                          const char *name, const char *value)
 462 {
 463         if (transport->ops->set_option)
 464                 return transport->ops->set_option(transport, name, value);
 465         return 1;
 466 }
 467
 468 int transport_push(struct transport *transport,
 469                    int refspec_nr, const char **refspec, int flags)
 470 {
 471         if (!transport->ops->push)
 472                 return 1;
 473         return transport->ops->push(transport, refspec_nr, refspec, flags);
 474 }
 475
 476 struct ref *transport_get_remote_refs(struct transport *transport)
 477 {
 478         if (!transport->remote_refs)
 479                 transport->remote_refs =
 480                         transport->ops->get_refs_list(transport);
 481         return transport->remote_refs;
 482 }
 483
 484 int transport_fetch_refs(struct transport *transport, struct ref *refs)
 485 {
 486         int rc;
 487         int nr_heads = 0, nr_alloc = 0;
 488         struct ref **heads = NULL;
 489         struct ref *rm;
 490
 491         for (rm = refs; rm; rm = rm->next) {
 492                 if (rm->peer_ref &&
 493                     !hashcmp(rm->peer_ref->old_sha1, rm->old_sha1))
 494                         continue;
 495                 ALLOC_GROW(heads, nr_heads + 1, nr_alloc);
 496                 heads[nr_heads++] = rm;
 497         }
 498
 499         rc = transport->ops->fetch(transport, nr_heads, heads);
 500         free(heads);
 501         return rc;
 502 }
 503
 504 void transport_unlock_pack(struct transport *transport)
 505 {
 506         if (transport->pack_lockfile) {
 507                 unlink(transport->pack_lockfile);
 508                 free(transport->pack_lockfile);
 509                 transport->pack_lockfile = NULL;
 510         }
 511 }
 512
 513 int transport_disconnect(struct transport *transport)
 514 {
 515         int ret = 0;
 516         if (transport->ops->disconnect)
 517                 ret = transport->ops->disconnect(transport);
 518         free(transport);
 519         return ret;
 520 }