Andrew's git / gitweb.git / transport-helper.c
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transport-helper.con commit builtin-rev-list.c: mark file-local function static (f1c92c6)
   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
  11struct 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
  25static 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
  88static 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
 104static const char *unsupported_options[] = {
 105        TRANS_OPT_UPLOADPACK,
 106        TRANS_OPT_RECEIVEPACK,
 107        TRANS_OPT_THIN,
 108        TRANS_OPT_KEEP
 109        };
 110static const char *boolean_options[] = {
 111        TRANS_OPT_THIN,
 112        TRANS_OPT_KEEP,
 113        TRANS_OPT_FOLLOWTAGS
 114        };
 115
 116static 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
 167static 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
 182static 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
 192static 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
 235static 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
 248static 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
 291static 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
 314static 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                return 0;
 326
 327        helper = get_helper(transport);
 328        if (!data->push)
 329                return 1;
 330
 331        for (ref = remote_refs; ref; ref = ref->next) {
 332                if (ref->peer_ref)
 333                        hashcpy(ref->new_sha1, ref->peer_ref->new_sha1);
 334                else if (!mirror)
 335                        continue;
 336
 337                ref->deletion = is_null_sha1(ref->new_sha1);
 338                if (!ref->deletion &&
 339                        !hashcmp(ref->old_sha1, ref->new_sha1)) {
 340                        ref->status = REF_STATUS_UPTODATE;
 341                        continue;
 342                }
 343
 344                if (force_all)
 345                        ref->force = 1;
 346
 347                strbuf_addstr(&buf, "push ");
 348                if (!ref->deletion) {
 349                        if (ref->force)
 350                                strbuf_addch(&buf, '+');
 351                        if (ref->peer_ref)
 352                                strbuf_addstr(&buf, ref->peer_ref->name);
 353                        else
 354                                strbuf_addstr(&buf, sha1_to_hex(ref->new_sha1));
 355                }
 356                strbuf_addch(&buf, ':');
 357                strbuf_addstr(&buf, ref->name);
 358                strbuf_addch(&buf, '\n');
 359        }
 360        if (buf.len == 0)
 361                return 0;
 362
 363        transport->verbose = flags & TRANSPORT_PUSH_VERBOSE ? 1 : 0;
 364        standard_options(transport);
 365
 366        if (flags & TRANSPORT_PUSH_DRY_RUN) {
 367                if (set_helper_option(transport, "dry-run", "true") != 0)
 368                        die("helper %s does not support dry-run", data->name);
 369        }
 370
 371        strbuf_addch(&buf, '\n');
 372        if (write_in_full(helper->in, buf.buf, buf.len) != buf.len)
 373                exit(128);
 374
 375        ref = remote_refs;
 376        while (1) {
 377                char *refname, *msg;
 378                int status;
 379
 380                strbuf_reset(&buf);
 381                if (strbuf_getline(&buf, data->out, '\n') == EOF)
 382                        exit(128); /* child died, message supplied already */
 383                if (!buf.len)
 384                        break;
 385
 386                if (!prefixcmp(buf.buf, "ok ")) {
 387                        status = REF_STATUS_OK;
 388                        refname = buf.buf + 3;
 389                } else if (!prefixcmp(buf.buf, "error ")) {
 390                        status = REF_STATUS_REMOTE_REJECT;
 391                        refname = buf.buf + 6;
 392                } else
 393                        die("expected ok/error, helper said '%s'\n", buf.buf);
 394
 395                msg = strchr(refname, ' ');
 396                if (msg) {
 397                        struct strbuf msg_buf = STRBUF_INIT;
 398                        const char *end;
 399
 400                        *msg++ = '\0';
 401                        if (!unquote_c_style(&msg_buf, msg, &end))
 402                                msg = strbuf_detach(&msg_buf, NULL);
 403                        else
 404                                msg = xstrdup(msg);
 405                        strbuf_release(&msg_buf);
 406
 407                        if (!strcmp(msg, "no match")) {
 408                                status = REF_STATUS_NONE;
 409                                free(msg);
 410                                msg = NULL;
 411                        }
 412                        else if (!strcmp(msg, "up to date")) {
 413                                status = REF_STATUS_UPTODATE;
 414                                free(msg);
 415                                msg = NULL;
 416                        }
 417                        else if (!strcmp(msg, "non-fast forward")) {
 418                                status = REF_STATUS_REJECT_NONFASTFORWARD;
 419                                free(msg);
 420                                msg = NULL;
 421                        }
 422                }
 423
 424                if (ref)
 425                        ref = find_ref_by_name(ref, refname);
 426                if (!ref)
 427                        ref = find_ref_by_name(remote_refs, refname);
 428                if (!ref) {
 429                        warning("helper reported unexpected status of %s", refname);
 430                        continue;
 431                }
 432
 433                ref->status = status;
 434                ref->remote_status = msg;
 435        }
 436        strbuf_release(&buf);
 437        return 0;
 438}
 439
 440static int has_attribute(const char *attrs, const char *attr) {
 441        int len;
 442        if (!attrs)
 443                return 0;
 444
 445        len = strlen(attr);
 446        for (;;) {
 447                const char *space = strchrnul(attrs, ' ');
 448                if (len == space - attrs && !strncmp(attrs, attr, len))
 449                        return 1;
 450                if (!*space)
 451                        return 0;
 452                attrs = space + 1;
 453        }
 454}
 455
 456static struct ref *get_refs_list(struct transport *transport, int for_push)
 457{
 458        struct helper_data *data = transport->data;
 459        struct child_process *helper;
 460        struct ref *ret = NULL;
 461        struct ref **tail = &ret;
 462        struct ref *posn;
 463        struct strbuf buf = STRBUF_INIT;
 464
 465        helper = get_helper(transport);
 466
 467        if (data->push && for_push)
 468                write_str_in_full(helper->in, "list for-push\n");
 469        else
 470                write_str_in_full(helper->in, "list\n");
 471
 472        while (1) {
 473                char *eov, *eon;
 474                if (strbuf_getline(&buf, data->out, '\n') == EOF)
 475                        exit(128); /* child died, message supplied already */
 476
 477                if (!*buf.buf)
 478                        break;
 479
 480                eov = strchr(buf.buf, ' ');
 481                if (!eov)
 482                        die("Malformed response in ref list: %s", buf.buf);
 483                eon = strchr(eov + 1, ' ');
 484                *eov = '\0';
 485                if (eon)
 486                        *eon = '\0';
 487                *tail = alloc_ref(eov + 1);
 488                if (buf.buf[0] == '@')
 489                        (*tail)->symref = xstrdup(buf.buf + 1);
 490                else if (buf.buf[0] != '?')
 491                        get_sha1_hex(buf.buf, (*tail)->old_sha1);
 492                if (eon) {
 493                        if (has_attribute(eon + 1, "unchanged")) {
 494                                (*tail)->status |= REF_STATUS_UPTODATE;
 495                                read_ref((*tail)->name, (*tail)->old_sha1);
 496                        }
 497                }
 498                tail = &((*tail)->next);
 499        }
 500        strbuf_release(&buf);
 501
 502        for (posn = ret; posn; posn = posn->next)
 503                resolve_remote_symref(posn, ret);
 504
 505        return ret;
 506}
 507
 508int transport_helper_init(struct transport *transport, const char *name)
 509{
 510        struct helper_data *data = xcalloc(sizeof(*data), 1);
 511        data->name = name;
 512
 513        transport->data = data;
 514        transport->set_option = set_helper_option;
 515        transport->get_refs_list = get_refs_list;
 516        transport->fetch = fetch;
 517        transport->push_refs = push_refs;
 518        transport->disconnect = release_helper;
 519        return 0;
 520}