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