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
  10 struct helper_data
  11 {
  12         const char *name;
  13         struct child_process *helper;
  14         FILE *out;
  15         unsigned fetch : 1,
  16                 option : 1,
  17                 push : 1;
  18 };
  19
  20 static struct child_process *get_helper(struct transport *transport)
  21 {
  22         struct helper_data *data = transport->data;
  23         struct strbuf buf = STRBUF_INIT;
  24         struct child_process *helper;
  25
  26         if (data->helper)
  27                 return data->helper;
  28
  29         helper = xcalloc(1, sizeof(*helper));
  30         helper->in = -1;
  31         helper->out = -1;
  32         helper->err = 0;
  33         helper->argv = xcalloc(4, sizeof(*helper->argv));
  34         strbuf_addf(&buf, "remote-%s", data->name);
  35         helper->argv[0] = strbuf_detach(&buf, NULL);
  36         helper->argv[1] = transport->remote->name;
  37         helper->argv[2] = transport->url;
  38         helper->git_cmd = 1;
  39         if (start_command(helper))
  40                 die("Unable to run helper: git %s", helper->argv[0]);
  41         data->helper = helper;
  42
  43         write_str_in_full(helper->in, "capabilities\n");
  44
  45         data->out = xfdopen(helper->out, "r");
  46         while (1) {
  47                 if (strbuf_getline(&buf, data->out, '\n') == EOF)
  48                         exit(128); /* child died, message supplied already */
  49
  50                 if (!*buf.buf)
  51                         break;
  52                 if (!strcmp(buf.buf, "fetch"))
  53                         data->fetch = 1;
  54                 if (!strcmp(buf.buf, "option"))
  55                         data->option = 1;
  56                 if (!strcmp(buf.buf, "push"))
  57                         data->push = 1;
  58         }
  59         return data->helper;
  60 }
  61
  62 static int disconnect_helper(struct transport *transport)
  63 {
  64         struct helper_data *data = transport->data;
  65         if (data->helper) {
  66                 write_str_in_full(data->helper->in, "\n");
  67                 close(data->helper->in);
  68                 fclose(data->out);
  69                 finish_command(data->helper);
  70                 free((char *)data->helper->argv[0]);
  71                 free(data->helper->argv);
  72                 free(data->helper);
  73                 data->helper = NULL;
  74         }
  75         free(data);
  76         return 0;
  77 }
  78
  79 static const char *unsupported_options[] = {
  80         TRANS_OPT_UPLOADPACK,
  81         TRANS_OPT_RECEIVEPACK,
  82         TRANS_OPT_THIN,
  83         TRANS_OPT_KEEP
  84         };
  85 static const char *boolean_options[] = {
  86         TRANS_OPT_THIN,
  87         TRANS_OPT_KEEP,
  88         TRANS_OPT_FOLLOWTAGS
  89         };
  90
  91 static int set_helper_option(struct transport *transport,
  92                           const char *name, const char *value)
  93 {
  94         struct helper_data *data = transport->data;
  95         struct child_process *helper = get_helper(transport);
  96         struct strbuf buf = STRBUF_INIT;
  97         int i, ret, is_bool = 0;
  98
  99         if (!data->option)
 100                 return 1;
 101
 102         for (i = 0; i < ARRAY_SIZE(unsupported_options); i++) {
 103                 if (!strcmp(name, unsupported_options[i]))
 104                         return 1;
 105         }
 106
 107         for (i = 0; i < ARRAY_SIZE(boolean_options); i++) {
 108                 if (!strcmp(name, boolean_options[i])) {
 109                         is_bool = 1;
 110                         break;
 111                 }
 112         }
 113
 114         strbuf_addf(&buf, "option %s ", name);
 115         if (is_bool)
 116                 strbuf_addstr(&buf, value ? "true" : "false");
 117         else
 118                 quote_c_style(value, &buf, NULL, 0);
 119         strbuf_addch(&buf, '\n');
 120
 121         if (write_in_full(helper->in, buf.buf, buf.len) != buf.len)
 122                 die_errno("cannot send option to %s", data->name);
 123
 124         strbuf_reset(&buf);
 125         if (strbuf_getline(&buf, data->out, '\n') == EOF)
 126                 exit(128); /* child died, message supplied already */
 127
 128         if (!strcmp(buf.buf, "ok"))
 129                 ret = 0;
 130         else if (!prefixcmp(buf.buf, "error")) {
 131                 ret = -1;
 132         } else if (!strcmp(buf.buf, "unsupported"))
 133                 ret = 1;
 134         else {
 135                 warning("%s unexpectedly said: '%s'", data->name, buf.buf);
 136                 ret = 1;
 137         }
 138         strbuf_release(&buf);
 139         return ret;
 140 }
 141
 142 static void standard_options(struct transport *t)
 143 {
 144         char buf[16];
 145         int n;
 146         int v = t->verbose;
 147         int no_progress = v < 0 || (!t->progress && !isatty(1));
 148
 149         set_helper_option(t, "progress", !no_progress ? "true" : "false");
 150
 151         n = snprintf(buf, sizeof(buf), "%d", v + 1);
 152         if (n >= sizeof(buf))
 153                 die("impossibly large verbosity value");
 154         set_helper_option(t, "verbosity", buf);
 155 }
 156
 157 static int fetch_with_fetch(struct transport *transport,
 158                             int nr_heads, const struct ref **to_fetch)
 159 {
 160         struct helper_data *data = transport->data;
 161         int i;
 162         struct strbuf buf = STRBUF_INIT;
 163
 164         standard_options(transport);
 165
 166         for (i = 0; i < nr_heads; i++) {
 167                 const struct ref *posn = to_fetch[i];
 168                 if (posn->status & REF_STATUS_UPTODATE)
 169                         continue;
 170
 171                 strbuf_addf(&buf, "fetch %s %s\n",
 172                             sha1_to_hex(posn->old_sha1), posn->name);
 173         }
 174
 175         strbuf_addch(&buf, '\n');
 176         if (write_in_full(data->helper->in, buf.buf, buf.len) != buf.len)
 177                 die_errno("cannot send fetch to %s", data->name);
 178
 179         while (1) {
 180                 strbuf_reset(&buf);
 181                 if (strbuf_getline(&buf, data->out, '\n') == EOF)
 182                         exit(128); /* child died, message supplied already */
 183
 184                 if (!prefixcmp(buf.buf, "lock ")) {
 185                         const char *name = buf.buf + 5;
 186                         if (transport->pack_lockfile)
 187                                 warning("%s also locked %s", data->name, name);
 188                         else
 189                                 transport->pack_lockfile = xstrdup(name);
 190                 }
 191                 else if (!buf.len)
 192                         break;
 193                 else
 194                         warning("%s unexpectedly said: '%s'", data->name, buf.buf);
 195         }
 196         strbuf_release(&buf);
 197         return 0;
 198 }
 199
 200 static int fetch(struct transport *transport,
 201                  int nr_heads, const struct ref **to_fetch)
 202 {
 203         struct helper_data *data = transport->data;
 204         int i, count;
 205
 206         count = 0;
 207         for (i = 0; i < nr_heads; i++)
 208                 if (!(to_fetch[i]->status & REF_STATUS_UPTODATE))
 209                         count++;
 210
 211         if (!count)
 212                 return 0;
 213
 214         if (data->fetch)
 215                 return fetch_with_fetch(transport, nr_heads, to_fetch);
 216
 217         return -1;
 218 }
 219
 220 static int push_refs(struct transport *transport,
 221                 struct ref *remote_refs, int flags)
 222 {
 223         int force_all = flags & TRANSPORT_PUSH_FORCE;
 224         int mirror = flags & TRANSPORT_PUSH_MIRROR;
 225         struct helper_data *data = transport->data;
 226         struct strbuf buf = STRBUF_INIT;
 227         struct child_process *helper;
 228         struct ref *ref;
 229
 230         if (!remote_refs)
 231                 return 0;
 232
 233         helper = get_helper(transport);
 234         if (!data->push)
 235                 return 1;
 236
 237         for (ref = remote_refs; ref; ref = ref->next) {
 238                 if (ref->peer_ref)
 239                         hashcpy(ref->new_sha1, ref->peer_ref->new_sha1);
 240                 else if (!mirror)
 241                         continue;
 242
 243                 ref->deletion = is_null_sha1(ref->new_sha1);
 244                 if (!ref->deletion &&
 245                         !hashcmp(ref->old_sha1, ref->new_sha1)) {
 246                         ref->status = REF_STATUS_UPTODATE;
 247                         continue;
 248                 }
 249
 250                 if (force_all)
 251                         ref->force = 1;
 252
 253                 strbuf_addstr(&buf, "push ");
 254                 if (!ref->deletion) {
 255                         if (ref->force)
 256                                 strbuf_addch(&buf, '+');
 257                         if (ref->peer_ref)
 258                                 strbuf_addstr(&buf, ref->peer_ref->name);
 259                         else
 260                                 strbuf_addstr(&buf, sha1_to_hex(ref->new_sha1));
 261                 }
 262                 strbuf_addch(&buf, ':');
 263                 strbuf_addstr(&buf, ref->name);
 264                 strbuf_addch(&buf, '\n');
 265         }
 266         if (buf.len == 0)
 267                 return 0;
 268
 269         transport->verbose = flags & TRANSPORT_PUSH_VERBOSE ? 1 : 0;
 270         standard_options(transport);
 271
 272         if (flags & TRANSPORT_PUSH_DRY_RUN) {
 273                 if (set_helper_option(transport, "dry-run", "true") != 0)
 274                         die("helper %s does not support dry-run", data->name);
 275         }
 276
 277         strbuf_addch(&buf, '\n');
 278         if (write_in_full(helper->in, buf.buf, buf.len) != buf.len)
 279                 exit(128);
 280
 281         ref = remote_refs;
 282         while (1) {
 283                 char *refname, *msg;
 284                 int status;
 285
 286                 strbuf_reset(&buf);
 287                 if (strbuf_getline(&buf, data->out, '\n') == EOF)
 288                         exit(128); /* child died, message supplied already */
 289                 if (!buf.len)
 290                         break;
 291
 292                 if (!prefixcmp(buf.buf, "ok ")) {
 293                         status = REF_STATUS_OK;
 294                         refname = buf.buf + 3;
 295                 } else if (!prefixcmp(buf.buf, "error ")) {
 296                         status = REF_STATUS_REMOTE_REJECT;
 297                         refname = buf.buf + 6;
 298                 } else
 299                         die("expected ok/error, helper said '%s'\n", buf.buf);
 300
 301                 msg = strchr(refname, ' ');
 302                 if (msg) {
 303                         struct strbuf msg_buf = STRBUF_INIT;
 304                         const char *end;
 305
 306                         *msg++ = '\0';
 307                         if (!unquote_c_style(&msg_buf, msg, &end))
 308                                 msg = strbuf_detach(&msg_buf, NULL);
 309                         else
 310                                 msg = xstrdup(msg);
 311                         strbuf_release(&msg_buf);
 312
 313                         if (!strcmp(msg, "no match")) {
 314                                 status = REF_STATUS_NONE;
 315                                 free(msg);
 316                                 msg = NULL;
 317                         }
 318                         else if (!strcmp(msg, "up to date")) {
 319                                 status = REF_STATUS_UPTODATE;
 320                                 free(msg);
 321                                 msg = NULL;
 322                         }
 323                         else if (!strcmp(msg, "non-fast forward")) {
 324                                 status = REF_STATUS_REJECT_NONFASTFORWARD;
 325                                 free(msg);
 326                                 msg = NULL;
 327                         }
 328                 }
 329
 330                 if (ref)
 331                         ref = find_ref_by_name(ref, refname);
 332                 if (!ref)
 333                         ref = find_ref_by_name(remote_refs, refname);
 334                 if (!ref) {
 335                         warning("helper reported unexpected status of %s", refname);
 336                         continue;
 337                 }
 338
 339                 ref->status = status;
 340                 ref->remote_status = msg;
 341         }
 342         strbuf_release(&buf);
 343         return 0;
 344 }
 345
 346 static struct ref *get_refs_list(struct transport *transport, int for_push)
 347 {
 348         struct helper_data *data = transport->data;
 349         struct child_process *helper;
 350         struct ref *ret = NULL;
 351         struct ref **tail = &ret;
 352         struct ref *posn;
 353         struct strbuf buf = STRBUF_INIT;
 354
 355         helper = get_helper(transport);
 356
 357         if (data->push && for_push)
 358                 write_str_in_full(helper->in, "list for-push\n");
 359         else
 360                 write_str_in_full(helper->in, "list\n");
 361
 362         while (1) {
 363                 char *eov, *eon;
 364                 if (strbuf_getline(&buf, data->out, '\n') == EOF)
 365                         exit(128); /* child died, message supplied already */
 366
 367                 if (!*buf.buf)
 368                         break;
 369
 370                 eov = strchr(buf.buf, ' ');
 371                 if (!eov)
 372                         die("Malformed response in ref list: %s", buf.buf);
 373                 eon = strchr(eov + 1, ' ');
 374                 *eov = '\0';
 375                 if (eon)
 376                         *eon = '\0';
 377                 *tail = alloc_ref(eov + 1);
 378                 if (buf.buf[0] == '@')
 379                         (*tail)->symref = xstrdup(buf.buf + 1);
 380                 else if (buf.buf[0] != '?')
 381                         get_sha1_hex(buf.buf, (*tail)->old_sha1);
 382                 tail = &((*tail)->next);
 383         }
 384         strbuf_release(&buf);
 385
 386         for (posn = ret; posn; posn = posn->next)
 387                 resolve_remote_symref(posn, ret);
 388
 389         return ret;
 390 }
 391
 392 int transport_helper_init(struct transport *transport, const char *name)
 393 {
 394         struct helper_data *data = xcalloc(sizeof(*data), 1);
 395         data->name = name;
 396
 397         transport->data = data;
 398         transport->set_option = set_helper_option;
 399         transport->get_refs_list = get_refs_list;
 400         transport->fetch = fetch;
 401         transport->push_refs = push_refs;
 402         transport->disconnect = disconnect_helper;
 403         return 0;
 404 }