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(const struct transport *transport,
  13                                  int nr_objs, char **objs)
  14 {
  15         char *dest = xstrdup(transport->url);
  16         struct walker *walker = transport->data;
  17
  18         walker->get_all = 1;
  19         walker->get_tree = 1;
  20         walker->get_history = 1;
  21         walker->get_verbosely = transport->verbose;
  22         walker->get_recover = 0;
  23
  24         if (walker_fetch(walker, nr_objs, objs, NULL, dest))
  25                 die("Fetch failed.");
  26
  27         free(dest);
  28         return 0;
  29 }
  30
  31 static int disconnect_walker(struct transport *transport)
  32 {
  33         struct walker *walker = transport->data;
  34         if (walker)
  35                 walker_free(walker);
  36         return 0;
  37 }
  38
  39 static const struct transport_ops rsync_transport;
  40
  41 static int curl_transport_push(struct transport *transport, int refspec_nr, const char **refspec, int flags) {
  42         const char **argv;
  43         int argc;
  44         int err;
  45
  46         argv = xmalloc((refspec_nr + 11) * sizeof(char *));
  47         argv[0] = "http-push";
  48         argc = 1;
  49         if (flags & TRANSPORT_PUSH_ALL)
  50                 argv[argc++] = "--all";
  51         if (flags & TRANSPORT_PUSH_FORCE)
  52                 argv[argc++] = "--force";
  53         argv[argc++] = transport->url;
  54         while (refspec_nr--)
  55                 argv[argc++] = *refspec++;
  56         argv[argc] = NULL;
  57         err = run_command_v_opt(argv, RUN_GIT_CMD);
  58         switch (err) {
  59         case -ERR_RUN_COMMAND_FORK:
  60                 error("unable to fork for %s", argv[0]);
  61         case -ERR_RUN_COMMAND_EXEC:
  62                 error("unable to exec %s", argv[0]);
  63                 break;
  64         case -ERR_RUN_COMMAND_WAITPID:
  65         case -ERR_RUN_COMMAND_WAITPID_WRONG_PID:
  66         case -ERR_RUN_COMMAND_WAITPID_SIGNAL:
  67         case -ERR_RUN_COMMAND_WAITPID_NOEXIT:
  68                 error("%s died with strange error", argv[0]);
  69         }
  70         return !!err;
  71 }
  72
  73 #ifndef NO_CURL
  74 static int missing__target(int code, int result)
  75 {
  76         return  /* file:// URL -- do we ever use one??? */
  77                 (result == CURLE_FILE_COULDNT_READ_FILE) ||
  78                 /* http:// and https:// URL */
  79                 (code == 404 && result == CURLE_HTTP_RETURNED_ERROR) ||
  80                 /* ftp:// URL */
  81                 (code == 550 && result == CURLE_FTP_COULDNT_RETR_FILE)
  82                 ;
  83 }
  84
  85 #define missing_target(a) missing__target((a)->http_code, (a)->curl_result)
  86
  87 static struct ref *get_refs_via_curl(const struct transport *transport)
  88 {
  89         struct buffer buffer;
  90         char *data, *start, *mid;
  91         char *ref_name;
  92         char *refs_url;
  93         int i = 0;
  94
  95         struct active_request_slot *slot;
  96         struct slot_results results;
  97
  98         struct ref *refs = NULL;
  99         struct ref *ref = NULL;
 100         struct ref *last_ref = NULL;
 101
 102         data = xmalloc(4096);
 103         buffer.size = 4096;
 104         buffer.posn = 0;
 105         buffer.buffer = data;
 106
 107         refs_url = xmalloc(strlen(transport->url) + 11);
 108         sprintf(refs_url, "%s/info/refs", transport->url);
 109
 110         http_init();
 111
 112         slot = get_active_slot();
 113         slot->results = &results;
 114         curl_easy_setopt(slot->curl, CURLOPT_FILE, &buffer);
 115         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
 116         curl_easy_setopt(slot->curl, CURLOPT_URL, refs_url);
 117         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, NULL);
 118         if (start_active_slot(slot)) {
 119                 run_active_slot(slot);
 120                 if (results.curl_result != CURLE_OK) {
 121                         if (missing_target(&results)) {
 122                                 free(buffer.buffer);
 123                                 return NULL;
 124                         } else {
 125                                 free(buffer.buffer);
 126                                 error("%s", curl_errorstr);
 127                                 return NULL;
 128                         }
 129                 }
 130         } else {
 131                 free(buffer.buffer);
 132                 error("Unable to start request");
 133                 return NULL;
 134         }
 135
 136         http_cleanup();
 137
 138         data = buffer.buffer;
 139         start = NULL;
 140         mid = data;
 141         while (i < buffer.posn) {
 142                 if (!start)
 143                         start = &data[i];
 144                 if (data[i] == '\t')
 145                         mid = &data[i];
 146                 if (data[i] == '\n') {
 147                         data[i] = 0;
 148                         ref_name = mid + 1;
 149                         ref = xmalloc(sizeof(struct ref) +
 150                                       strlen(ref_name) + 1);
 151                         memset(ref, 0, sizeof(struct ref));
 152                         strcpy(ref->name, ref_name);
 153                         get_sha1_hex(start, ref->old_sha1);
 154                         if (!refs)
 155                                 refs = ref;
 156                         if (last_ref)
 157                                 last_ref->next = ref;
 158                         last_ref = ref;
 159                         start = NULL;
 160                 }
 161                 i++;
 162         }
 163
 164         free(buffer.buffer);
 165
 166         return refs;
 167 }
 168
 169 #else
 170
 171 static struct ref *get_refs_via_curl(const struct transport *transport)
 172 {
 173         die("Cannot fetch from '%s' without curl ...", transport->url);
 174         return NULL;
 175 }
 176
 177 #endif
 178
 179 static const struct transport_ops curl_transport = {
 180         /* set_option */        NULL,
 181         /* get_refs_list */     get_refs_via_curl,
 182         /* fetch_refs */        NULL,
 183         /* fetch_objs */        fetch_objs_via_walker,
 184         /* push */              curl_transport_push,
 185         /* disconnect */        disconnect_walker
 186 };
 187
 188 struct bundle_transport_data {
 189         int fd;
 190         struct bundle_header header;
 191 };
 192
 193 static struct ref *get_refs_from_bundle(const struct transport *transport)
 194 {
 195         struct bundle_transport_data *data = transport->data;
 196         struct ref *result = NULL;
 197         int i;
 198
 199         if (data->fd > 0)
 200                 close(data->fd);
 201         data->fd = read_bundle_header(transport->url, &data->header);
 202         if (data->fd < 0)
 203                 die ("Could not read bundle '%s'.", transport->url);
 204         for (i = 0; i < data->header.references.nr; i++) {
 205                 struct ref_list_entry *e = data->header.references.list + i;
 206                 struct ref *ref = alloc_ref(strlen(e->name));
 207                 hashcpy(ref->old_sha1, e->sha1);
 208                 strcpy(ref->name, e->name);
 209                 ref->next = result;
 210                 result = ref;
 211         }
 212         return result;
 213 }
 214
 215 static int fetch_refs_from_bundle(const struct transport *transport,
 216                                int nr_heads, char **heads)
 217 {
 218         struct bundle_transport_data *data = transport->data;
 219         return unbundle(&data->header, data->fd);
 220 }
 221
 222 static int close_bundle(struct transport *transport)
 223 {
 224         struct bundle_transport_data *data = transport->data;
 225         if (data->fd > 0)
 226                 close(data->fd);
 227         return 0;
 228 }
 229
 230 static const struct transport_ops bundle_transport = {
 231         /* set_option */        NULL,
 232         /* get_refs_list */     get_refs_from_bundle,
 233         /* fetch_refs */        fetch_refs_from_bundle,
 234         /* fetch_objs */        NULL,
 235         /* push */              NULL,
 236         /* disconnect */        close_bundle
 237 };
 238
 239 struct git_transport_data {
 240         unsigned thin : 1;
 241         unsigned keep : 1;
 242
 243         int unpacklimit;
 244
 245         int depth;
 246
 247         const char *uploadpack;
 248         const char *receivepack;
 249 };
 250
 251 static int set_git_option(struct transport *connection,
 252                           const char *name, const char *value)
 253 {
 254         struct git_transport_data *data = connection->data;
 255         if (!strcmp(name, TRANS_OPT_UPLOADPACK)) {
 256                 data->uploadpack = value;
 257                 return 0;
 258         } else if (!strcmp(name, TRANS_OPT_RECEIVEPACK)) {
 259                 data->receivepack = value;
 260                 return 0;
 261         } else if (!strcmp(name, TRANS_OPT_THIN)) {
 262                 data->thin = !!value;
 263                 return 0;
 264         } else if (!strcmp(name, TRANS_OPT_KEEP)) {
 265                 data->keep = !!value;
 266                 return 0;
 267         } else if (!strcmp(name, TRANS_OPT_UNPACKLIMIT)) {
 268                 data->unpacklimit = atoi(value);
 269                 return 0;
 270         } else if (!strcmp(name, TRANS_OPT_DEPTH)) {
 271                 if (!value)
 272                         data->depth = 0;
 273                 else
 274                         data->depth = atoi(value);
 275                 return 0;
 276         }
 277         return 1;
 278 }
 279
 280 static struct ref *get_refs_via_connect(const struct transport *transport)
 281 {
 282         struct git_transport_data *data = transport->data;
 283         struct ref *refs;
 284         int fd[2];
 285         pid_t pid;
 286         char *dest = xstrdup(transport->url);
 287
 288         pid = git_connect(fd, dest, data->uploadpack, 0);
 289
 290         if (pid < 0)
 291                 die("Failed to connect to \"%s\"", transport->url);
 292
 293         get_remote_heads(fd[0], &refs, 0, NULL, 0);
 294         packet_flush(fd[1]);
 295
 296         finish_connect(pid);
 297
 298         free(dest);
 299
 300         return refs;
 301 }
 302
 303 static int fetch_refs_via_pack(const struct transport *transport,
 304                                int nr_heads, char **heads)
 305 {
 306         struct git_transport_data *data = transport->data;
 307         struct ref *refs;
 308         char *dest = xstrdup(transport->url);
 309         struct fetch_pack_args args;
 310
 311         args.uploadpack = data->uploadpack;
 312         args.quiet = 0;
 313         args.keep_pack = data->keep;
 314         args.unpacklimit = data->unpacklimit;
 315         args.use_thin_pack = data->thin;
 316         args.fetch_all = 0;
 317         args.verbose = transport->verbose;
 318         args.depth = data->depth;
 319         args.no_progress = 0;
 320
 321         setup_fetch_pack(&args);
 322
 323         refs = fetch_pack(dest, nr_heads, heads);
 324
 325         // ???? check that refs got everything?
 326
 327         /* free the memory used for the refs list ... */
 328
 329         free_refs(refs);
 330
 331         free(dest);
 332         return 0;
 333 }
 334
 335 static int git_transport_push(struct transport *transport, int refspec_nr, const char **refspec, int flags) {
 336         struct git_transport_data *data = transport->data;
 337         const char **argv;
 338         char *rem;
 339         int argc;
 340         int err;
 341
 342         argv = xmalloc((refspec_nr + 11) * sizeof(char *));
 343         argv[0] = "send-pack";
 344         argc = 1;
 345         if (flags & TRANSPORT_PUSH_ALL)
 346                 argv[argc++] = "--all";
 347         if (flags & TRANSPORT_PUSH_FORCE)
 348                 argv[argc++] = "--force";
 349         if (data->receivepack) {
 350                 char *rp = xmalloc(strlen(data->receivepack) + 16);
 351                 sprintf(rp, "--receive-pack=%s", data->receivepack);
 352                 argv[argc++] = rp;
 353         }
 354         if (data->thin)
 355                 argv[argc++] = "--thin";
 356         rem = xmalloc(strlen(transport->remote->name) + 10);
 357         sprintf(rem, "--remote=%s", transport->remote->name);
 358         argv[argc++] = rem;
 359         argv[argc++] = transport->url;
 360         while (refspec_nr--)
 361                 argv[argc++] = *refspec++;
 362         argv[argc] = NULL;
 363         err = run_command_v_opt(argv, RUN_GIT_CMD);
 364         switch (err) {
 365         case -ERR_RUN_COMMAND_FORK:
 366                 error("unable to fork for %s", argv[0]);
 367         case -ERR_RUN_COMMAND_EXEC:
 368                 error("unable to exec %s", argv[0]);
 369                 break;
 370         case -ERR_RUN_COMMAND_WAITPID:
 371         case -ERR_RUN_COMMAND_WAITPID_WRONG_PID:
 372         case -ERR_RUN_COMMAND_WAITPID_SIGNAL:
 373         case -ERR_RUN_COMMAND_WAITPID_NOEXIT:
 374                 error("%s died with strange error", argv[0]);
 375         }
 376         return !!err;
 377 }
 378
 379 static const struct transport_ops git_transport = {
 380         /* set_option */        set_git_option,
 381         /* get_refs_list */     get_refs_via_connect,
 382         /* fetch_refs */        fetch_refs_via_pack,
 383         /* fetch_objs */        NULL,
 384         /* push */              git_transport_push
 385 };
 386
 387 static int is_local(const char *url)
 388 {
 389         const char *colon = strchr(url, ':');
 390         const char *slash = strchr(url, '/');
 391         return !colon || (slash && slash < colon);
 392 }
 393
 394 static int is_file(const char *url)
 395 {
 396         struct stat buf;
 397         if (stat(url, &buf))
 398                 return 0;
 399         return S_ISREG(buf.st_mode);
 400 }
 401
 402 struct transport *transport_get(struct remote *remote, const char *url,
 403                                 int fetch)
 404 {
 405         struct transport *ret = NULL;
 406         if (!prefixcmp(url, "rsync://")) {
 407                 ret = xmalloc(sizeof(*ret));
 408                 ret->data = NULL;
 409                 ret->ops = &rsync_transport;
 410         } else if (!prefixcmp(url, "http://") || !prefixcmp(url, "https://") ||
 411                    !prefixcmp(url, "ftp://")) {
 412                 ret = xmalloc(sizeof(*ret));
 413                 ret->ops = &curl_transport;
 414                 if (fetch)
 415                         ret->data = get_http_walker(url);
 416                 else
 417                         ret->data = NULL;
 418         } else if (is_local(url) && is_file(url)) {
 419                 struct bundle_transport_data *data = xcalloc(1, sizeof(*data));
 420                 ret = xmalloc(sizeof(*ret));
 421                 ret->data = data;
 422                 ret->ops = &bundle_transport;
 423         } else {
 424                 struct git_transport_data *data = xcalloc(1, sizeof(*data));
 425                 ret = xcalloc(1, sizeof(*ret));
 426                 ret->data = data;
 427                 data->thin = 1;
 428                 data->uploadpack = "git-upload-pack";
 429                 if (remote && remote->uploadpack)
 430                         data->uploadpack = remote->uploadpack;
 431                 data->receivepack = "git-receive-pack";
 432                 if (remote && remote->receivepack)
 433                         data->receivepack = remote->receivepack;
 434                 data->unpacklimit = -1;
 435                 ret->ops = &git_transport;
 436         }
 437         if (ret) {
 438                 ret->remote = remote;
 439                 ret->url = url;
 440                 ret->remote_refs = NULL;
 441                 ret->fetch = !!fetch;
 442         }
 443         return ret;
 444 }
 445
 446 int transport_set_option(struct transport *transport,
 447                          const char *name, const char *value)
 448 {
 449         int ret = 1;
 450         if (transport->ops->set_option)
 451                 ret = transport->ops->set_option(transport, name, value);
 452         if (ret < 0)
 453                 fprintf(stderr, "For '%s' option %s cannot be set to '%s'\n",
 454                         transport->url, name, value);
 455         if (ret > 0)
 456                 fprintf(stderr, "For '%s' option %s is ignored\n",
 457                         transport->url, name);
 458         return ret;
 459 }
 460
 461 int transport_push(struct transport *transport,
 462                    int refspec_nr, const char **refspec, int flags)
 463 {
 464         if (!transport->ops->push)
 465                 return 1;
 466         return transport->ops->push(transport, refspec_nr, refspec, flags);
 467 }
 468
 469 struct ref *transport_get_remote_refs(struct transport *transport)
 470 {
 471         if (!transport->remote_refs)
 472                 transport->remote_refs =
 473                         transport->ops->get_refs_list(transport);
 474         return transport->remote_refs;
 475 }
 476
 477 #define PACK_HEADS_CHUNK_COUNT 256
 478
 479 int transport_fetch_refs(struct transport *transport, struct ref *refs)
 480 {
 481         int i;
 482         int nr_heads = 0;
 483         char **heads = xmalloc(PACK_HEADS_CHUNK_COUNT * sizeof(char *));
 484         struct ref *rm;
 485         int use_objs = !transport->ops->fetch_refs;
 486
 487         for (rm = refs; rm; rm = rm->next) {
 488                 if (rm->peer_ref &&
 489                     !hashcmp(rm->peer_ref->old_sha1, rm->old_sha1))
 490                         continue;
 491                 if (use_objs) {
 492                         heads[nr_heads++] = xstrdup(sha1_to_hex(rm->old_sha1));
 493                 } else {
 494                         heads[nr_heads++] = xstrdup(rm->name);
 495                 }
 496                 if (nr_heads % PACK_HEADS_CHUNK_COUNT == 0)
 497                         heads = xrealloc(heads,
 498                                          (nr_heads + PACK_HEADS_CHUNK_COUNT) *
 499                                          sizeof(char *));
 500         }
 501
 502         if (use_objs) {
 503                 if (transport->ops->fetch_objs(transport, nr_heads, heads))
 504                         return -1;
 505         } else {
 506                 if (transport->ops->fetch_refs(transport, nr_heads, heads))
 507                         return -1;
 508         }
 509
 510         /* free the memory used for the heads list ... */
 511         for (i = 0; i < nr_heads; i++)
 512                 free(heads[i]);
 513         free(heads);
 514         return 0;
 515 }
 516
 517 int transport_disconnect(struct transport *transport)
 518 {
 519         int ret = 0;
 520         if (transport->ops->disconnect)
 521                 ret = transport->ops->disconnect(transport);
 522         free(transport);
 523         return ret;
 524 }