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 static int debug;
  12
  13 struct helper_data
  14 {
  15         const char *name;
  16         struct child_process *helper;
  17         FILE *out;
  18         unsigned fetch : 1,
  19                 import : 1,
  20                 option : 1,
  21                 push : 1;
  22         /* These go from remote name (as in "list") to private name */
  23         struct refspec *refspecs;
  24         int refspec_nr;
  25 };
  26
  27 static void sendline(struct helper_data *helper, struct strbuf *buffer)
  28 {
  29         if (debug)
  30                 fprintf(stderr, "Debug: Remote helper: -> %s", buffer->buf);
  31         if (write_in_full(helper->helper->in, buffer->buf, buffer->len)
  32                 != buffer->len)
  33                 die_errno("Full write to remote helper failed");
  34 }
  35
  36 static int recvline(struct helper_data *helper, struct strbuf *buffer)
  37 {
  38         strbuf_reset(buffer);
  39         if (debug)
  40                 fprintf(stderr, "Debug: Remote helper: Waiting...\n");
  41         if (strbuf_getline(buffer, helper->out, '\n') == EOF) {
  42                 if (debug)
  43                         fprintf(stderr, "Debug: Remote helper quit.\n");
  44                 exit(128);
  45         }
  46
  47         if (debug)
  48                 fprintf(stderr, "Debug: Remote helper: <- %s\n", buffer->buf);
  49         return 0;
  50 }
  51
  52 static void xchgline(struct helper_data *helper, struct strbuf *buffer)
  53 {
  54         sendline(helper, buffer);
  55         recvline(helper, buffer);
  56 }
  57
  58 static void write_constant(int fd, const char *str)
  59 {
  60         if (debug)
  61                 fprintf(stderr, "Debug: Remote helper: -> %s", str);
  62         if (write_in_full(fd, str, strlen(str)) != strlen(str))
  63                 die_errno("Full write to remote helper failed");
  64 }
  65
  66 static struct child_process *get_helper(struct transport *transport)
  67 {
  68         struct helper_data *data = transport->data;
  69         struct strbuf buf = STRBUF_INIT;
  70         struct child_process *helper;
  71         const char **refspecs = NULL;
  72         int refspec_nr = 0;
  73         int refspec_alloc = 0;
  74
  75         if (data->helper)
  76                 return data->helper;
  77
  78         helper = xcalloc(1, sizeof(*helper));
  79         helper->in = -1;
  80         helper->out = -1;
  81         helper->err = 0;
  82         helper->argv = xcalloc(4, sizeof(*helper->argv));
  83         strbuf_addf(&buf, "remote-%s", data->name);
  84         helper->argv[0] = strbuf_detach(&buf, NULL);
  85         helper->argv[1] = transport->remote->name;
  86         helper->argv[2] = transport->url;
  87         helper->git_cmd = 1;
  88         if (start_command(helper))
  89                 die("Unable to run helper: git %s", helper->argv[0]);
  90         data->helper = helper;
  91
  92         write_constant(helper->in, "capabilities\n");
  93
  94         data->out = xfdopen(helper->out, "r");
  95         while (1) {
  96                 recvline(data, &buf);
  97
  98                 if (!*buf.buf)
  99                         break;
 100                 if (debug)
 101                         fprintf(stderr, "Debug: Got cap %s\n", buf.buf);
 102                 if (!strcmp(buf.buf, "fetch"))
 103                         data->fetch = 1;
 104                 if (!strcmp(buf.buf, "option"))
 105                         data->option = 1;
 106                 if (!strcmp(buf.buf, "push"))
 107                         data->push = 1;
 108                 if (!strcmp(buf.buf, "import"))
 109                         data->import = 1;
 110                 if (!data->refspecs && !prefixcmp(buf.buf, "refspec ")) {
 111                         ALLOC_GROW(refspecs,
 112                                    refspec_nr + 1,
 113                                    refspec_alloc);
 114                         refspecs[refspec_nr++] = strdup(buf.buf + strlen("refspec "));
 115                 }
 116         }
 117         if (refspecs) {
 118                 int i;
 119                 data->refspec_nr = refspec_nr;
 120                 data->refspecs = parse_fetch_refspec(refspec_nr, refspecs);
 121                 for (i = 0; i < refspec_nr; i++) {
 122                         free((char *)refspecs[i]);
 123                 }
 124                 free(refspecs);
 125         }
 126         strbuf_release(&buf);
 127         if (debug)
 128                 fprintf(stderr, "Debug: Capabilities complete.\n");
 129         return data->helper;
 130 }
 131
 132 static int disconnect_helper(struct transport *transport)
 133 {
 134         struct helper_data *data = transport->data;
 135         struct strbuf buf = STRBUF_INIT;
 136
 137         if (data->helper) {
 138                 if (debug)
 139                         fprintf(stderr, "Debug: Disconnecting.\n");
 140                 strbuf_addf(&buf, "\n");
 141                 sendline(data, &buf);
 142                 close(data->helper->in);
 143                 fclose(data->out);
 144                 finish_command(data->helper);
 145                 free((char *)data->helper->argv[0]);
 146                 free(data->helper->argv);
 147                 free(data->helper);
 148                 data->helper = NULL;
 149         }
 150         return 0;
 151 }
 152
 153 static const char *unsupported_options[] = {
 154         TRANS_OPT_UPLOADPACK,
 155         TRANS_OPT_RECEIVEPACK,
 156         TRANS_OPT_THIN,
 157         TRANS_OPT_KEEP
 158         };
 159 static const char *boolean_options[] = {
 160         TRANS_OPT_THIN,
 161         TRANS_OPT_KEEP,
 162         TRANS_OPT_FOLLOWTAGS
 163         };
 164
 165 static int set_helper_option(struct transport *transport,
 166                           const char *name, const char *value)
 167 {
 168         struct helper_data *data = transport->data;
 169         struct strbuf buf = STRBUF_INIT;
 170         int i, ret, is_bool = 0;
 171
 172         get_helper(transport);
 173
 174         if (!data->option)
 175                 return 1;
 176
 177         for (i = 0; i < ARRAY_SIZE(unsupported_options); i++) {
 178                 if (!strcmp(name, unsupported_options[i]))
 179                         return 1;
 180         }
 181
 182         for (i = 0; i < ARRAY_SIZE(boolean_options); i++) {
 183                 if (!strcmp(name, boolean_options[i])) {
 184                         is_bool = 1;
 185                         break;
 186                 }
 187         }
 188
 189         strbuf_addf(&buf, "option %s ", name);
 190         if (is_bool)
 191                 strbuf_addstr(&buf, value ? "true" : "false");
 192         else
 193                 quote_c_style(value, &buf, NULL, 0);
 194         strbuf_addch(&buf, '\n');
 195
 196         xchgline(data, &buf);
 197
 198         if (!strcmp(buf.buf, "ok"))
 199                 ret = 0;
 200         else if (!prefixcmp(buf.buf, "error")) {
 201                 ret = -1;
 202         } else if (!strcmp(buf.buf, "unsupported"))
 203                 ret = 1;
 204         else {
 205                 warning("%s unexpectedly said: '%s'", data->name, buf.buf);
 206                 ret = 1;
 207         }
 208         strbuf_release(&buf);
 209         return ret;
 210 }
 211
 212 static void standard_options(struct transport *t)
 213 {
 214         char buf[16];
 215         int n;
 216         int v = t->verbose;
 217         int no_progress = v < 0 || (!t->progress && !isatty(1));
 218
 219         set_helper_option(t, "progress", !no_progress ? "true" : "false");
 220
 221         n = snprintf(buf, sizeof(buf), "%d", v + 1);
 222         if (n >= sizeof(buf))
 223                 die("impossibly large verbosity value");
 224         set_helper_option(t, "verbosity", buf);
 225 }
 226
 227 static int release_helper(struct transport *transport)
 228 {
 229         struct helper_data *data = transport->data;
 230         free_refspec(data->refspec_nr, data->refspecs);
 231         data->refspecs = NULL;
 232         disconnect_helper(transport);
 233         free(transport->data);
 234         return 0;
 235 }
 236
 237 static int fetch_with_fetch(struct transport *transport,
 238                             int nr_heads, struct ref **to_fetch)
 239 {
 240         struct helper_data *data = transport->data;
 241         int i;
 242         struct strbuf buf = STRBUF_INIT;
 243
 244         standard_options(transport);
 245
 246         for (i = 0; i < nr_heads; i++) {
 247                 const struct ref *posn = to_fetch[i];
 248                 if (posn->status & REF_STATUS_UPTODATE)
 249                         continue;
 250
 251                 strbuf_addf(&buf, "fetch %s %s\n",
 252                             sha1_to_hex(posn->old_sha1), posn->name);
 253         }
 254
 255         strbuf_addch(&buf, '\n');
 256         sendline(data, &buf);
 257
 258         while (1) {
 259                 recvline(data, &buf);
 260
 261                 if (!prefixcmp(buf.buf, "lock ")) {
 262                         const char *name = buf.buf + 5;
 263                         if (transport->pack_lockfile)
 264                                 warning("%s also locked %s", data->name, name);
 265                         else
 266                                 transport->pack_lockfile = xstrdup(name);
 267                 }
 268                 else if (!buf.len)
 269                         break;
 270                 else
 271                         warning("%s unexpectedly said: '%s'", data->name, buf.buf);
 272         }
 273         strbuf_release(&buf);
 274         return 0;
 275 }
 276
 277 static int get_importer(struct transport *transport, struct child_process *fastimport)
 278 {
 279         struct child_process *helper = get_helper(transport);
 280         memset(fastimport, 0, sizeof(*fastimport));
 281         fastimport->in = helper->out;
 282         fastimport->argv = xcalloc(5, sizeof(*fastimport->argv));
 283         fastimport->argv[0] = "fast-import";
 284         fastimport->argv[1] = "--quiet";
 285
 286         fastimport->git_cmd = 1;
 287         return start_command(fastimport);
 288 }
 289
 290 static int fetch_with_import(struct transport *transport,
 291                              int nr_heads, struct ref **to_fetch)
 292 {
 293         struct child_process fastimport;
 294         struct helper_data *data = transport->data;
 295         int i;
 296         struct ref *posn;
 297         struct strbuf buf = STRBUF_INIT;
 298
 299         get_helper(transport);
 300
 301         if (get_importer(transport, &fastimport))
 302                 die("Couldn't run fast-import");
 303
 304         for (i = 0; i < nr_heads; i++) {
 305                 posn = to_fetch[i];
 306                 if (posn->status & REF_STATUS_UPTODATE)
 307                         continue;
 308
 309                 strbuf_addf(&buf, "import %s\n", posn->name);
 310                 sendline(data, &buf);
 311                 strbuf_reset(&buf);
 312         }
 313         disconnect_helper(transport);
 314         finish_command(&fastimport);
 315         free(fastimport.argv);
 316         fastimport.argv = NULL;
 317
 318         for (i = 0; i < nr_heads; i++) {
 319                 char *private;
 320                 posn = to_fetch[i];
 321                 if (posn->status & REF_STATUS_UPTODATE)
 322                         continue;
 323                 if (data->refspecs)
 324                         private = apply_refspecs(data->refspecs, data->refspec_nr, posn->name);
 325                 else
 326                         private = strdup(posn->name);
 327                 read_ref(private, posn->old_sha1);
 328                 free(private);
 329         }
 330         strbuf_release(&buf);
 331         return 0;
 332 }
 333
 334 static int fetch(struct transport *transport,
 335                  int nr_heads, struct ref **to_fetch)
 336 {
 337         struct helper_data *data = transport->data;
 338         int i, count;
 339
 340         count = 0;
 341         for (i = 0; i < nr_heads; i++)
 342                 if (!(to_fetch[i]->status & REF_STATUS_UPTODATE))
 343                         count++;
 344
 345         if (!count)
 346                 return 0;
 347
 348         if (data->fetch)
 349                 return fetch_with_fetch(transport, nr_heads, to_fetch);
 350
 351         if (data->import)
 352                 return fetch_with_import(transport, nr_heads, to_fetch);
 353
 354         return -1;
 355 }
 356
 357 static int push_refs(struct transport *transport,
 358                 struct ref *remote_refs, int flags)
 359 {
 360         int force_all = flags & TRANSPORT_PUSH_FORCE;
 361         int mirror = flags & TRANSPORT_PUSH_MIRROR;
 362         struct helper_data *data = transport->data;
 363         struct strbuf buf = STRBUF_INIT;
 364         struct child_process *helper;
 365         struct ref *ref;
 366
 367         if (!remote_refs)
 368                 return 0;
 369
 370         helper = get_helper(transport);
 371         if (!data->push)
 372                 return 1;
 373
 374         for (ref = remote_refs; ref; ref = ref->next) {
 375                 if (ref->peer_ref)
 376                         hashcpy(ref->new_sha1, ref->peer_ref->new_sha1);
 377                 else if (!mirror)
 378                         continue;
 379
 380                 ref->deletion = is_null_sha1(ref->new_sha1);
 381                 if (!ref->deletion &&
 382                         !hashcmp(ref->old_sha1, ref->new_sha1)) {
 383                         ref->status = REF_STATUS_UPTODATE;
 384                         continue;
 385                 }
 386
 387                 if (force_all)
 388                         ref->force = 1;
 389
 390                 strbuf_addstr(&buf, "push ");
 391                 if (!ref->deletion) {
 392                         if (ref->force)
 393                                 strbuf_addch(&buf, '+');
 394                         if (ref->peer_ref)
 395                                 strbuf_addstr(&buf, ref->peer_ref->name);
 396                         else
 397                                 strbuf_addstr(&buf, sha1_to_hex(ref->new_sha1));
 398                 }
 399                 strbuf_addch(&buf, ':');
 400                 strbuf_addstr(&buf, ref->name);
 401                 strbuf_addch(&buf, '\n');
 402         }
 403         if (buf.len == 0)
 404                 return 0;
 405
 406         transport->verbose = flags & TRANSPORT_PUSH_VERBOSE ? 1 : 0;
 407         standard_options(transport);
 408
 409         if (flags & TRANSPORT_PUSH_DRY_RUN) {
 410                 if (set_helper_option(transport, "dry-run", "true") != 0)
 411                         die("helper %s does not support dry-run", data->name);
 412         }
 413
 414         strbuf_addch(&buf, '\n');
 415         sendline(data, &buf);
 416
 417         ref = remote_refs;
 418         while (1) {
 419                 char *refname, *msg;
 420                 int status;
 421
 422                 recvline(data, &buf);
 423                 if (!buf.len)
 424                         break;
 425
 426                 if (!prefixcmp(buf.buf, "ok ")) {
 427                         status = REF_STATUS_OK;
 428                         refname = buf.buf + 3;
 429                 } else if (!prefixcmp(buf.buf, "error ")) {
 430                         status = REF_STATUS_REMOTE_REJECT;
 431                         refname = buf.buf + 6;
 432                 } else
 433                         die("expected ok/error, helper said '%s'\n", buf.buf);
 434
 435                 msg = strchr(refname, ' ');
 436                 if (msg) {
 437                         struct strbuf msg_buf = STRBUF_INIT;
 438                         const char *end;
 439
 440                         *msg++ = '\0';
 441                         if (!unquote_c_style(&msg_buf, msg, &end))
 442                                 msg = strbuf_detach(&msg_buf, NULL);
 443                         else
 444                                 msg = xstrdup(msg);
 445                         strbuf_release(&msg_buf);
 446
 447                         if (!strcmp(msg, "no match")) {
 448                                 status = REF_STATUS_NONE;
 449                                 free(msg);
 450                                 msg = NULL;
 451                         }
 452                         else if (!strcmp(msg, "up to date")) {
 453                                 status = REF_STATUS_UPTODATE;
 454                                 free(msg);
 455                                 msg = NULL;
 456                         }
 457                         else if (!strcmp(msg, "non-fast forward")) {
 458                                 status = REF_STATUS_REJECT_NONFASTFORWARD;
 459                                 free(msg);
 460                                 msg = NULL;
 461                         }
 462                 }
 463
 464                 if (ref)
 465                         ref = find_ref_by_name(ref, refname);
 466                 if (!ref)
 467                         ref = find_ref_by_name(remote_refs, refname);
 468                 if (!ref) {
 469                         warning("helper reported unexpected status of %s", refname);
 470                         continue;
 471                 }
 472
 473                 ref->status = status;
 474                 ref->remote_status = msg;
 475         }
 476         strbuf_release(&buf);
 477         return 0;
 478 }
 479
 480 static int has_attribute(const char *attrs, const char *attr) {
 481         int len;
 482         if (!attrs)
 483                 return 0;
 484
 485         len = strlen(attr);
 486         for (;;) {
 487                 const char *space = strchrnul(attrs, ' ');
 488                 if (len == space - attrs && !strncmp(attrs, attr, len))
 489                         return 1;
 490                 if (!*space)
 491                         return 0;
 492                 attrs = space + 1;
 493         }
 494 }
 495
 496 static struct ref *get_refs_list(struct transport *transport, int for_push)
 497 {
 498         struct helper_data *data = transport->data;
 499         struct child_process *helper;
 500         struct ref *ret = NULL;
 501         struct ref **tail = &ret;
 502         struct ref *posn;
 503         struct strbuf buf = STRBUF_INIT;
 504
 505         helper = get_helper(transport);
 506
 507         if (data->push && for_push)
 508                 write_str_in_full(helper->in, "list for-push\n");
 509         else
 510                 write_str_in_full(helper->in, "list\n");
 511
 512         while (1) {
 513                 char *eov, *eon;
 514                 recvline(data, &buf);
 515
 516                 if (!*buf.buf)
 517                         break;
 518
 519                 eov = strchr(buf.buf, ' ');
 520                 if (!eov)
 521                         die("Malformed response in ref list: %s", buf.buf);
 522                 eon = strchr(eov + 1, ' ');
 523                 *eov = '\0';
 524                 if (eon)
 525                         *eon = '\0';
 526                 *tail = alloc_ref(eov + 1);
 527                 if (buf.buf[0] == '@')
 528                         (*tail)->symref = xstrdup(buf.buf + 1);
 529                 else if (buf.buf[0] != '?')
 530                         get_sha1_hex(buf.buf, (*tail)->old_sha1);
 531                 if (eon) {
 532                         if (has_attribute(eon + 1, "unchanged")) {
 533                                 (*tail)->status |= REF_STATUS_UPTODATE;
 534                                 read_ref((*tail)->name, (*tail)->old_sha1);
 535                         }
 536                 }
 537                 tail = &((*tail)->next);
 538         }
 539         if (debug)
 540                 fprintf(stderr, "Debug: Read ref listing.\n");
 541         strbuf_release(&buf);
 542
 543         for (posn = ret; posn; posn = posn->next)
 544                 resolve_remote_symref(posn, ret);
 545
 546         return ret;
 547 }
 548
 549 int transport_helper_init(struct transport *transport, const char *name)
 550 {
 551         struct helper_data *data = xcalloc(sizeof(*data), 1);
 552         data->name = name;
 553
 554         if (getenv("GIT_TRANSPORT_HELPER_DEBUG"))
 555                 debug = 1;
 556
 557         transport->data = data;
 558         transport->set_option = set_helper_option;
 559         transport->get_refs_list = get_refs_list;
 560         transport->fetch = fetch;
 561         transport->push_refs = push_refs;
 562         transport->disconnect = release_helper;
 563         return 0;
 564 }