transport-helper.c

   1 #include "cache.h"
   2 #include "transport.h"
   3 #include "quote.h"
   4 #include "run-command.h"
   5 #include "commit.h"
   6 #include "diff.h"
   7 #include "revision.h"
   8 #include "quote.h"
   9 #include "remote.h"
  10
  11 struct helper_data
  12 {
  13         const char *name;
  14         struct child_process *helper;
  15         FILE *out;
  16         unsigned fetch : 1,
  17                 import : 1,
  18                 option : 1,
  19                 push : 1;
  20         /* These go from remote name (as in "list") to private name */
  21         struct refspec *refspecs;
  22         int refspec_nr;
  23 };
  24
  25 static struct child_process *get_helper(struct transport *transport)
  26 {
  27         struct helper_data *data = transport->data;
  28         struct strbuf buf = STRBUF_INIT;
  29         struct child_process *helper;
  30         const char **refspecs = NULL;
  31         int refspec_nr = 0;
  32         int refspec_alloc = 0;
  33
  34         if (data->helper)
  35                 return data->helper;
  36
  37         helper = xcalloc(1, sizeof(*helper));
  38         helper->in = -1;
  39         helper->out = -1;
  40         helper->err = 0;
  41         helper->argv = xcalloc(4, sizeof(*helper->argv));
  42         strbuf_addf(&buf, "remote-%s", data->name);
  43         helper->argv[0] = strbuf_detach(&buf, NULL);
  44         helper->argv[1] = transport->remote->name;
  45         helper->argv[2] = transport->url;
  46         helper->git_cmd = 1;
  47         if (start_command(helper))
  48                 die("Unable to run helper: git %s", helper->argv[0]);
  49         data->helper = helper;
  50
  51         write_str_in_full(helper->in, "capabilities\n");
  52
  53         data->out = xfdopen(helper->out, "r");
  54         while (1) {
  55                 if (strbuf_getline(&buf, data->out, '\n') == EOF)
  56                         exit(128); /* child died, message supplied already */
  57
  58                 if (!*buf.buf)
  59                         break;
  60                 if (!strcmp(buf.buf, "fetch"))
  61                         data->fetch = 1;
  62                 if (!strcmp(buf.buf, "option"))
  63                         data->option = 1;
  64                 if (!strcmp(buf.buf, "push"))
  65                         data->push = 1;
  66                 if (!strcmp(buf.buf, "import"))
  67                         data->import = 1;
  68                 if (!data->refspecs && !prefixcmp(buf.buf, "refspec ")) {
  69                         ALLOC_GROW(refspecs,
  70                                    refspec_nr + 1,
  71                                    refspec_alloc);
  72                         refspecs[refspec_nr++] = strdup(buf.buf + strlen("refspec "));
  73                 }
  74         }
  75         if (refspecs) {
  76                 int i;
  77                 data->refspec_nr = refspec_nr;
  78                 data->refspecs = parse_fetch_refspec(refspec_nr, refspecs);
  79                 for (i = 0; i < refspec_nr; i++) {
  80                         free((char *)refspecs[i]);
  81                 }
  82                 free(refspecs);
  83         }
  84         strbuf_release(&buf);
  85         return data->helper;
  86 }
  87
  88 static int disconnect_helper(struct transport *transport)
  89 {
  90         struct helper_data *data = transport->data;
  91         if (data->helper) {
  92                 write_str_in_full(data->helper->in, "\n");
  93                 close(data->helper->in);
  94                 fclose(data->out);
  95                 finish_command(data->helper);
  96                 free((char *)data->helper->argv[0]);
  97                 free(data->helper->argv);
  98                 free(data->helper);
  99                 data->helper = NULL;
 100         }
 101         return 0;
 102 }
 103
 104 static const char *unsupported_options[] = {
 105         TRANS_OPT_UPLOADPACK,
 106         TRANS_OPT_RECEIVEPACK,
 107         TRANS_OPT_THIN,
 108         TRANS_OPT_KEEP
 109         };
 110 static const char *boolean_options[] = {
 111         TRANS_OPT_THIN,
 112         TRANS_OPT_KEEP,
 113         TRANS_OPT_FOLLOWTAGS
 114         };
 115
 116 static int set_helper_option(struct transport *transport,
 117                           const char *name, const char *value)
 118 {
 119         struct helper_data *data = transport->data;
 120         struct child_process *helper = get_helper(transport);
 121         struct strbuf buf = STRBUF_INIT;
 122         int i, ret, is_bool = 0;
 123
 124         if (!data->option)
 125                 return 1;
 126
 127         for (i = 0; i < ARRAY_SIZE(unsupported_options); i++) {
 128                 if (!strcmp(name, unsupported_options[i]))
 129                         return 1;
 130         }
 131
 132         for (i = 0; i < ARRAY_SIZE(boolean_options); i++) {
 133                 if (!strcmp(name, boolean_options[i])) {
 134                         is_bool = 1;
 135                         break;
 136                 }
 137         }
 138
 139         strbuf_addf(&buf, "option %s ", name);
 140         if (is_bool)
 141                 strbuf_addstr(&buf, value ? "true" : "false");
 142         else
 143                 quote_c_style(value, &buf, NULL, 0);
 144         strbuf_addch(&buf, '\n');
 145
 146         if (write_in_full(helper->in, buf.buf, buf.len) != buf.len)
 147                 die_errno("cannot send option to %s", data->name);
 148
 149         strbuf_reset(&buf);
 150         if (strbuf_getline(&buf, data->out, '\n') == EOF)
 151                 exit(128); /* child died, message supplied already */
 152
 153         if (!strcmp(buf.buf, "ok"))
 154                 ret = 0;
 155         else if (!prefixcmp(buf.buf, "error")) {
 156                 ret = -1;
 157         } else if (!strcmp(buf.buf, "unsupported"))
 158                 ret = 1;
 159         else {
 160                 warning("%s unexpectedly said: '%s'", data->name, buf.buf);
 161                 ret = 1;
 162         }
 163         strbuf_release(&buf);
 164         return ret;
 165 }
 166
 167 static void standard_options(struct transport *t)
 168 {
 169         char buf[16];
 170         int n;
 171         int v = t->verbose;
 172         int no_progress = v < 0 || (!t->progress && !isatty(1));
 173
 174         set_helper_option(t, "progress", !no_progress ? "true" : "false");
 175
 176         n = snprintf(buf, sizeof(buf), "%d", v + 1);
 177         if (n >= sizeof(buf))
 178                 die("impossibly large verbosity value");
 179         set_helper_option(t, "verbosity", buf);
 180 }
 181
 182 static int release_helper(struct transport *transport)
 183 {
 184         struct helper_data *data = transport->data;
 185         free_refspec(data->refspec_nr, data->refspecs);
 186         data->refspecs = NULL;
 187         disconnect_helper(transport);
 188         free(transport->data);
 189         return 0;
 190 }
 191
 192 static int fetch_with_fetch(struct transport *transport,
 193                             int nr_heads, struct ref **to_fetch)
 194 {
 195         struct helper_data *data = transport->data;
 196         int i;
 197         struct strbuf buf = STRBUF_INIT;
 198
 199         standard_options(transport);
 200
 201         for (i = 0; i < nr_heads; i++) {
 202                 const struct ref *posn = to_fetch[i];
 203                 if (posn->status & REF_STATUS_UPTODATE)
 204                         continue;
 205
 206                 strbuf_addf(&buf, "fetch %s %s\n",
 207                             sha1_to_hex(posn->old_sha1), posn->name);
 208         }
 209
 210         strbuf_addch(&buf, '\n');
 211         if (write_in_full(data->helper->in, buf.buf, buf.len) != buf.len)
 212                 die_errno("cannot send fetch to %s", data->name);
 213
 214         while (1) {
 215                 strbuf_reset(&buf);
 216                 if (strbuf_getline(&buf, data->out, '\n') == EOF)
 217                         exit(128); /* child died, message supplied already */
 218
 219                 if (!prefixcmp(buf.buf, "lock ")) {
 220                         const char *name = buf.buf + 5;
 221                         if (transport->pack_lockfile)
 222                                 warning("%s also locked %s", data->name, name);
 223                         else
 224                                 transport->pack_lockfile = xstrdup(name);
 225                 }
 226                 else if (!buf.len)
 227                         break;
 228                 else
 229                         warning("%s unexpectedly said: '%s'", data->name, buf.buf);
 230         }
 231         strbuf_release(&buf);
 232         return 0;
 233 }
 234
 235 static int get_importer(struct transport *transport, struct child_process *fastimport)
 236 {
 237         struct child_process *helper = get_helper(transport);
 238         memset(fastimport, 0, sizeof(*fastimport));
 239         fastimport->in = helper->out;
 240         fastimport->argv = xcalloc(5, sizeof(*fastimport->argv));
 241         fastimport->argv[0] = "fast-import";
 242         fastimport->argv[1] = "--quiet";
 243
 244         fastimport->git_cmd = 1;
 245         return start_command(fastimport);
 246 }
 247
 248 static int fetch_with_import(struct transport *transport,
 249                              int nr_heads, struct ref **to_fetch)
 250 {
 251         struct child_process fastimport;
 252         struct child_process *helper = get_helper(transport);
 253         struct helper_data *data = transport->data;
 254         int i;
 255         struct ref *posn;
 256         struct strbuf buf = STRBUF_INIT;
 257
 258         if (get_importer(transport, &fastimport))
 259                 die("Couldn't run fast-import");
 260
 261         for (i = 0; i < nr_heads; i++) {
 262                 posn = to_fetch[i];
 263                 if (posn->status & REF_STATUS_UPTODATE)
 264                         continue;
 265
 266                 strbuf_addf(&buf, "import %s\n", posn->name);
 267                 write_in_full(helper->in, buf.buf, buf.len);
 268                 strbuf_reset(&buf);
 269         }
 270         disconnect_helper(transport);
 271         finish_command(&fastimport);
 272         free(fastimport.argv);
 273         fastimport.argv = NULL;
 274
 275         for (i = 0; i < nr_heads; i++) {
 276                 char *private;
 277                 posn = to_fetch[i];
 278                 if (posn->status & REF_STATUS_UPTODATE)
 279                         continue;
 280                 if (data->refspecs)
 281                         private = apply_refspecs(data->refspecs, data->refspec_nr, posn->name);
 282                 else
 283                         private = strdup(posn->name);
 284                 read_ref(private, posn->old_sha1);
 285                 free(private);
 286         }
 287         strbuf_release(&buf);
 288         return 0;
 289 }
 290
 291 static int fetch(struct transport *transport,
 292                  int nr_heads, struct ref **to_fetch)
 293 {
 294         struct helper_data *data = transport->data;
 295         int i, count;
 296
 297         count = 0;
 298         for (i = 0; i < nr_heads; i++)
 299                 if (!(to_fetch[i]->status & REF_STATUS_UPTODATE))
 300                         count++;
 301
 302         if (!count)
 303                 return 0;
 304
 305         if (data->fetch)
 306                 return fetch_with_fetch(transport, nr_heads, to_fetch);
 307
 308         if (data->import)
 309                 return fetch_with_import(transport, nr_heads, to_fetch);
 310
 311         return -1;
 312 }
 313
 314 static int push_refs(struct transport *transport,
 315                 struct ref *remote_refs, int flags)
 316 {
 317         int force_all = flags & TRANSPORT_PUSH_FORCE;
 318         int mirror = flags & TRANSPORT_PUSH_MIRROR;
 319         struct helper_data *data = transport->data;
 320         struct strbuf buf = STRBUF_INIT;
 321         struct child_process *helper;
 322         struct ref *ref;
 323
 324         if (!remote_refs) {
 325                 fprintf(stderr, "No refs in common and none specified; doing nothing.\n"
 326                         "Perhaps you should specify a branch such as 'master'.\n");
 327                 return 0;
 328         }
 329
 330         helper = get_helper(transport);
 331         if (!data->push)
 332                 return 1;
 333
 334         for (ref = remote_refs; ref; ref = ref->next) {
 335                 if (!ref->peer_ref && !mirror)
 336                         continue;
 337
 338                 /* Check for statuses set by set_ref_status_for_push() */
 339                 switch (ref->status) {
 340                 case REF_STATUS_REJECT_NONFASTFORWARD:
 341                 case REF_STATUS_UPTODATE:
 342                         continue;
 343                 default:
 344                         ; /* do nothing */
 345                 }
 346
 347                 if (force_all)
 348                         ref->force = 1;
 349
 350                 strbuf_addstr(&buf, "push ");
 351                 if (!ref->deletion) {
 352                         if (ref->force)
 353                                 strbuf_addch(&buf, '+');
 354                         if (ref->peer_ref)
 355                                 strbuf_addstr(&buf, ref->peer_ref->name);
 356                         else
 357                                 strbuf_addstr(&buf, sha1_to_hex(ref->new_sha1));
 358                 }
 359                 strbuf_addch(&buf, ':');
 360                 strbuf_addstr(&buf, ref->name);
 361                 strbuf_addch(&buf, '\n');
 362         }
 363         if (buf.len == 0)
 364                 return 0;
 365
 366         transport->verbose = flags & TRANSPORT_PUSH_VERBOSE ? 1 : 0;
 367         standard_options(transport);
 368
 369         if (flags & TRANSPORT_PUSH_DRY_RUN) {
 370                 if (set_helper_option(transport, "dry-run", "true") != 0)
 371                         die("helper %s does not support dry-run", data->name);
 372         }
 373
 374         strbuf_addch(&buf, '\n');
 375         if (write_in_full(helper->in, buf.buf, buf.len) != buf.len)
 376                 exit(128);
 377
 378         ref = remote_refs;
 379         while (1) {
 380                 char *refname, *msg;
 381                 int status;
 382
 383                 strbuf_reset(&buf);
 384                 if (strbuf_getline(&buf, data->out, '\n') == EOF)
 385                         exit(128); /* child died, message supplied already */
 386                 if (!buf.len)
 387                         break;
 388
 389                 if (!prefixcmp(buf.buf, "ok ")) {
 390                         status = REF_STATUS_OK;
 391                         refname = buf.buf + 3;
 392                 } else if (!prefixcmp(buf.buf, "error ")) {
 393                         status = REF_STATUS_REMOTE_REJECT;
 394                         refname = buf.buf + 6;
 395                 } else
 396                         die("expected ok/error, helper said '%s'\n", buf.buf);
 397
 398                 msg = strchr(refname, ' ');
 399                 if (msg) {
 400                         struct strbuf msg_buf = STRBUF_INIT;
 401                         const char *end;
 402
 403                         *msg++ = '\0';
 404                         if (!unquote_c_style(&msg_buf, msg, &end))
 405                                 msg = strbuf_detach(&msg_buf, NULL);
 406                         else
 407                                 msg = xstrdup(msg);
 408                         strbuf_release(&msg_buf);
 409
 410                         if (!strcmp(msg, "no match")) {
 411                                 status = REF_STATUS_NONE;
 412                                 free(msg);
 413                                 msg = NULL;
 414                         }
 415                         else if (!strcmp(msg, "up to date")) {
 416                                 status = REF_STATUS_UPTODATE;
 417                                 free(msg);
 418                                 msg = NULL;
 419                         }
 420                         else if (!strcmp(msg, "non-fast forward")) {
 421                                 status = REF_STATUS_REJECT_NONFASTFORWARD;
 422                                 free(msg);
 423                                 msg = NULL;
 424                         }
 425                 }
 426
 427                 if (ref)
 428                         ref = find_ref_by_name(ref, refname);
 429                 if (!ref)
 430                         ref = find_ref_by_name(remote_refs, refname);
 431                 if (!ref) {
 432                         warning("helper reported unexpected status of %s", refname);
 433                         continue;
 434                 }
 435
 436                 if (ref->status != REF_STATUS_NONE) {
 437                         /*
 438                          * Earlier, the ref was marked not to be pushed, so ignore the ref
 439                          * status reported by the remote helper if the latter is 'no match'.
 440                          */
 441                         if (status == REF_STATUS_NONE)
 442                                 continue;
 443                 }
 444
 445                 ref->status = status;
 446                 ref->remote_status = msg;
 447         }
 448         strbuf_release(&buf);
 449         return 0;
 450 }
 451
 452 static int has_attribute(const char *attrs, const char *attr) {
 453         int len;
 454         if (!attrs)
 455                 return 0;
 456
 457         len = strlen(attr);
 458         for (;;) {
 459                 const char *space = strchrnul(attrs, ' ');
 460                 if (len == space - attrs && !strncmp(attrs, attr, len))
 461                         return 1;
 462                 if (!*space)
 463                         return 0;
 464                 attrs = space + 1;
 465         }
 466 }
 467
 468 static struct ref *get_refs_list(struct transport *transport, int for_push)
 469 {
 470         struct helper_data *data = transport->data;
 471         struct child_process *helper;
 472         struct ref *ret = NULL;
 473         struct ref **tail = &ret;
 474         struct ref *posn;
 475         struct strbuf buf = STRBUF_INIT;
 476
 477         helper = get_helper(transport);
 478
 479         if (data->push && for_push)
 480                 write_str_in_full(helper->in, "list for-push\n");
 481         else
 482                 write_str_in_full(helper->in, "list\n");
 483
 484         while (1) {
 485                 char *eov, *eon;
 486                 if (strbuf_getline(&buf, data->out, '\n') == EOF)
 487                         exit(128); /* child died, message supplied already */
 488
 489                 if (!*buf.buf)
 490                         break;
 491
 492                 eov = strchr(buf.buf, ' ');
 493                 if (!eov)
 494                         die("Malformed response in ref list: %s", buf.buf);
 495                 eon = strchr(eov + 1, ' ');
 496                 *eov = '\0';
 497                 if (eon)
 498                         *eon = '\0';
 499                 *tail = alloc_ref(eov + 1);
 500                 if (buf.buf[0] == '@')
 501                         (*tail)->symref = xstrdup(buf.buf + 1);
 502                 else if (buf.buf[0] != '?')
 503                         get_sha1_hex(buf.buf, (*tail)->old_sha1);
 504                 if (eon) {
 505                         if (has_attribute(eon + 1, "unchanged")) {
 506                                 (*tail)->status |= REF_STATUS_UPTODATE;
 507                                 read_ref((*tail)->name, (*tail)->old_sha1);
 508                         }
 509                 }
 510                 tail = &((*tail)->next);
 511         }
 512         strbuf_release(&buf);
 513
 514         for (posn = ret; posn; posn = posn->next)
 515                 resolve_remote_symref(posn, ret);
 516
 517         return ret;
 518 }
 519
 520 int transport_helper_init(struct transport *transport, const char *name)
 521 {
 522         struct helper_data *data = xcalloc(sizeof(*data), 1);
 523         data->name = name;
 524
 525         transport->data = data;
 526         transport->set_option = set_helper_option;
 527         transport->get_refs_list = get_refs_list;
 528         transport->fetch = fetch;
 529         transport->push_refs = push_refs;
 530         transport->disconnect = release_helper;
 531         return 0;
 532 }