Andrew's git / gitweb.git / transport.c
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transport.con commit bundle transport: fix an alloc_ref() call (90446a0)
   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
  12static 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
  39static 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
  47static 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
  80static 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
  93static 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
 175static 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
 185static 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
 191static 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
 200struct bundle_transport_data {
 201        int fd;
 202        struct bundle_header header;
 203};
 204
 205static 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) + 1);
 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
 227static 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
 234static 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        free(data);
 240        return 0;
 241}
 242
 243struct git_transport_data {
 244        unsigned thin : 1;
 245        unsigned keep : 1;
 246        int depth;
 247        const char *uploadpack;
 248        const char *receivepack;
 249};
 250
 251static int set_git_option(struct transport *connection,
 252                          const char *name, const char *value)
 253{
 254        struct git_transport_data *data = connection->data;
 255        if (!strcmp(name, TRANS_OPT_UPLOADPACK)) {
 256                data->uploadpack = value;
 257                return 0;
 258        } else if (!strcmp(name, TRANS_OPT_RECEIVEPACK)) {
 259                data->receivepack = value;
 260                return 0;
 261        } else if (!strcmp(name, TRANS_OPT_THIN)) {
 262                data->thin = !!value;
 263                return 0;
 264        } else if (!strcmp(name, TRANS_OPT_KEEP)) {
 265                data->keep = !!value;
 266                return 0;
 267        } else if (!strcmp(name, TRANS_OPT_DEPTH)) {
 268                if (!value)
 269                        data->depth = 0;
 270                else
 271                        data->depth = atoi(value);
 272                return 0;
 273        }
 274        return 1;
 275}
 276
 277static struct ref *get_refs_via_connect(const struct transport *transport)
 278{
 279        struct git_transport_data *data = transport->data;
 280        struct ref *refs;
 281        int fd[2];
 282        pid_t pid;
 283        char *dest = xstrdup(transport->url);
 284
 285        pid = git_connect(fd, dest, data->uploadpack, 0);
 286
 287        if (pid < 0)
 288                die("Failed to connect to \"%s\"", transport->url);
 289
 290        get_remote_heads(fd[0], &refs, 0, NULL, 0);
 291        packet_flush(fd[1]);
 292
 293        finish_connect(pid);
 294
 295        free(dest);
 296
 297        return refs;
 298}
 299
 300static int fetch_refs_via_pack(struct transport *transport,
 301                               int nr_heads, struct ref **to_fetch)
 302{
 303        struct git_transport_data *data = transport->data;
 304        char **heads = xmalloc(nr_heads * sizeof(*heads));
 305        char **origh = xmalloc(nr_heads * sizeof(*origh));
 306        struct ref *refs;
 307        char *dest = xstrdup(transport->url);
 308        struct fetch_pack_args args;
 309        int i;
 310
 311        memset(&args, 0, sizeof(args));
 312        args.uploadpack = data->uploadpack;
 313        args.keep_pack = data->keep;
 314        args.lock_pack = 1;
 315        args.use_thin_pack = data->thin;
 316        args.verbose = transport->verbose;
 317        args.depth = data->depth;
 318
 319        for (i = 0; i < nr_heads; i++)
 320                origh[i] = heads[i] = xstrdup(to_fetch[i]->name);
 321        refs = fetch_pack(&args, dest, nr_heads, heads, &transport->pack_lockfile);
 322
 323        for (i = 0; i < nr_heads; i++)
 324                free(origh[i]);
 325        free(origh);
 326        free(heads);
 327        free_refs(refs);
 328        free(dest);
 329        return 0;
 330}
 331
 332static int git_transport_push(struct transport *transport, int refspec_nr, const char **refspec, int flags) {
 333        struct git_transport_data *data = transport->data;
 334        const char **argv;
 335        char *rem;
 336        int argc;
 337        int err;
 338
 339        argv = xmalloc((refspec_nr + 11) * sizeof(char *));
 340        argv[0] = "send-pack";
 341        argc = 1;
 342        if (flags & TRANSPORT_PUSH_ALL)
 343                argv[argc++] = "--all";
 344        if (flags & TRANSPORT_PUSH_FORCE)
 345                argv[argc++] = "--force";
 346        if (data->receivepack) {
 347                char *rp = xmalloc(strlen(data->receivepack) + 16);
 348                sprintf(rp, "--receive-pack=%s", data->receivepack);
 349                argv[argc++] = rp;
 350        }
 351        if (data->thin)
 352                argv[argc++] = "--thin";
 353        rem = xmalloc(strlen(transport->remote->name) + 10);
 354        sprintf(rem, "--remote=%s", transport->remote->name);
 355        argv[argc++] = rem;
 356        argv[argc++] = transport->url;
 357        while (refspec_nr--)
 358                argv[argc++] = *refspec++;
 359        argv[argc] = NULL;
 360        err = run_command_v_opt(argv, RUN_GIT_CMD);
 361        switch (err) {
 362        case -ERR_RUN_COMMAND_FORK:
 363                error("unable to fork for %s", argv[0]);
 364        case -ERR_RUN_COMMAND_EXEC:
 365                error("unable to exec %s", argv[0]);
 366                break;
 367        case -ERR_RUN_COMMAND_WAITPID:
 368        case -ERR_RUN_COMMAND_WAITPID_WRONG_PID:
 369        case -ERR_RUN_COMMAND_WAITPID_SIGNAL:
 370        case -ERR_RUN_COMMAND_WAITPID_NOEXIT:
 371                error("%s died with strange error", argv[0]);
 372        }
 373        return !!err;
 374}
 375
 376static int disconnect_git(struct transport *transport)
 377{
 378        free(transport->data);
 379        return 0;
 380}
 381
 382static int is_local(const char *url)
 383{
 384        const char *colon = strchr(url, ':');
 385        const char *slash = strchr(url, '/');
 386        return !colon || (slash && slash < colon);
 387}
 388
 389static int is_file(const char *url)
 390{
 391        struct stat buf;
 392        if (stat(url, &buf))
 393                return 0;
 394        return S_ISREG(buf.st_mode);
 395}
 396
 397struct transport *transport_get(struct remote *remote, const char *url)
 398{
 399        struct transport *ret = xcalloc(1, sizeof(*ret));
 400
 401        ret->remote = remote;
 402        ret->url = url;
 403
 404        if (!prefixcmp(url, "rsync://")) {
 405                /* not supported; don't populate any ops */
 406
 407        } else if (!prefixcmp(url, "http://")
 408                || !prefixcmp(url, "https://")
 409                || !prefixcmp(url, "ftp://")) {
 410                ret->get_refs_list = get_refs_via_curl;
 411                ret->fetch = fetch_objs_via_curl;
 412                ret->push = curl_transport_push;
 413                ret->disconnect = disconnect_walker;
 414
 415        } else if (is_local(url) && is_file(url)) {
 416                struct bundle_transport_data *data = xcalloc(1, sizeof(*data));
 417                ret->data = data;
 418                ret->get_refs_list = get_refs_from_bundle;
 419                ret->fetch = fetch_refs_from_bundle;
 420                ret->disconnect = close_bundle;
 421
 422        } else {
 423                struct git_transport_data *data = xcalloc(1, sizeof(*data));
 424                ret->data = data;
 425                ret->set_option = set_git_option;
 426                ret->get_refs_list = get_refs_via_connect;
 427                ret->fetch = fetch_refs_via_pack;
 428                ret->push = git_transport_push;
 429                ret->disconnect = disconnect_git;
 430
 431                data->thin = 1;
 432                data->uploadpack = "git-upload-pack";
 433                if (remote && remote->uploadpack)
 434                        data->uploadpack = remote->uploadpack;
 435                data->receivepack = "git-receive-pack";
 436                if (remote && remote->receivepack)
 437                        data->receivepack = remote->receivepack;
 438        }
 439
 440        return ret;
 441}
 442
 443int transport_set_option(struct transport *transport,
 444                         const char *name, const char *value)
 445{
 446        if (transport->set_option)
 447                return transport->set_option(transport, name, value);
 448        return 1;
 449}
 450
 451int transport_push(struct transport *transport,
 452                   int refspec_nr, const char **refspec, int flags)
 453{
 454        if (!transport->push)
 455                return 1;
 456        return transport->push(transport, refspec_nr, refspec, flags);
 457}
 458
 459struct ref *transport_get_remote_refs(struct transport *transport)
 460{
 461        if (!transport->remote_refs)
 462                transport->remote_refs = transport->get_refs_list(transport);
 463        return transport->remote_refs;
 464}
 465
 466int transport_fetch_refs(struct transport *transport, struct ref *refs)
 467{
 468        int rc;
 469        int nr_heads = 0, nr_alloc = 0;
 470        struct ref **heads = NULL;
 471        struct ref *rm;
 472
 473        for (rm = refs; rm; rm = rm->next) {
 474                if (rm->peer_ref &&
 475                    !hashcmp(rm->peer_ref->old_sha1, rm->old_sha1))
 476                        continue;
 477                ALLOC_GROW(heads, nr_heads + 1, nr_alloc);
 478                heads[nr_heads++] = rm;
 479        }
 480
 481        rc = transport->fetch(transport, nr_heads, heads);
 482        free(heads);
 483        return rc;
 484}
 485
 486void transport_unlock_pack(struct transport *transport)
 487{
 488        if (transport->pack_lockfile) {
 489                unlink(transport->pack_lockfile);
 490                free(transport->pack_lockfile);
 491                transport->pack_lockfile = NULL;
 492        }
 493}
 494
 495int transport_disconnect(struct transport *transport)
 496{
 497        int ret = 0;
 498        if (transport->disconnect)
 499                ret = transport->disconnect(transport);
 500        free(transport);
 501        return ret;
 502}