Andrew's git - gitweb.git/blob

5eabe8de0b6b3387fbfeff50177083a28f30078c
   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 const struct transport_ops rsync_transport;
  48
  49static int curl_transport_push(struct transport *transport, int refspec_nr, const char **refspec, int flags) {
  50        const char **argv;
  51        int argc;
  52        int err;
  53
  54        argv = xmalloc((refspec_nr + 11) * sizeof(char *));
  55        argv[0] = "http-push";
  56        argc = 1;
  57        if (flags & TRANSPORT_PUSH_ALL)
  58                argv[argc++] = "--all";
  59        if (flags & TRANSPORT_PUSH_FORCE)
  60                argv[argc++] = "--force";
  61        argv[argc++] = transport->url;
  62        while (refspec_nr--)
  63                argv[argc++] = *refspec++;
  64        argv[argc] = NULL;
  65        err = run_command_v_opt(argv, RUN_GIT_CMD);
  66        switch (err) {
  67        case -ERR_RUN_COMMAND_FORK:
  68                error("unable to fork for %s", argv[0]);
  69        case -ERR_RUN_COMMAND_EXEC:
  70                error("unable to exec %s", argv[0]);
  71                break;
  72        case -ERR_RUN_COMMAND_WAITPID:
  73        case -ERR_RUN_COMMAND_WAITPID_WRONG_PID:
  74        case -ERR_RUN_COMMAND_WAITPID_SIGNAL:
  75        case -ERR_RUN_COMMAND_WAITPID_NOEXIT:
  76                error("%s died with strange error", argv[0]);
  77        }
  78        return !!err;
  79}
  80
  81#ifndef NO_CURL
  82static int missing__target(int code, int result)
  83{
  84        return  /* file:// URL -- do we ever use one??? */
  85                (result == CURLE_FILE_COULDNT_READ_FILE) ||
  86                /* http:// and https:// URL */
  87                (code == 404 && result == CURLE_HTTP_RETURNED_ERROR) ||
  88                /* ftp:// URL */
  89                (code == 550 && result == CURLE_FTP_COULDNT_RETR_FILE)
  90                ;
  91}
  92
  93#define missing_target(a) missing__target((a)->http_code, (a)->curl_result)
  94
  95static struct ref *get_refs_via_curl(const struct transport *transport)
  96{
  97        struct buffer buffer;
  98        char *data, *start, *mid;
  99        char *ref_name;
 100        char *refs_url;
 101        int i = 0;
 102
 103        struct active_request_slot *slot;
 104        struct slot_results results;
 105
 106        struct ref *refs = NULL;
 107        struct ref *ref = NULL;
 108        struct ref *last_ref = NULL;
 109
 110        data = xmalloc(4096);
 111        buffer.size = 4096;
 112        buffer.posn = 0;
 113        buffer.buffer = data;
 114
 115        refs_url = xmalloc(strlen(transport->url) + 11);
 116        sprintf(refs_url, "%s/info/refs", transport->url);
 117
 118        http_init();
 119
 120        slot = get_active_slot();
 121        slot->results = &results;
 122        curl_easy_setopt(slot->curl, CURLOPT_FILE, &buffer);
 123        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
 124        curl_easy_setopt(slot->curl, CURLOPT_URL, refs_url);
 125        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, NULL);
 126        if (start_active_slot(slot)) {
 127                run_active_slot(slot);
 128                if (results.curl_result != CURLE_OK) {
 129                        if (missing_target(&results)) {
 130                                free(buffer.buffer);
 131                                return NULL;
 132                        } else {
 133                                free(buffer.buffer);
 134                                error("%s", curl_errorstr);
 135                                return NULL;
 136                        }
 137                }
 138        } else {
 139                free(buffer.buffer);
 140                error("Unable to start request");
 141                return NULL;
 142        }
 143
 144        http_cleanup();
 145
 146        data = buffer.buffer;
 147        start = NULL;
 148        mid = data;
 149        while (i < buffer.posn) {
 150                if (!start)
 151                        start = &data[i];
 152                if (data[i] == '\t')
 153                        mid = &data[i];
 154                if (data[i] == '\n') {
 155                        data[i] = 0;
 156                        ref_name = mid + 1;
 157                        ref = xmalloc(sizeof(struct ref) +
 158                                      strlen(ref_name) + 1);
 159                        memset(ref, 0, sizeof(struct ref));
 160                        strcpy(ref->name, ref_name);
 161                        get_sha1_hex(start, ref->old_sha1);
 162                        if (!refs)
 163                                refs = ref;
 164                        if (last_ref)
 165                                last_ref->next = ref;
 166                        last_ref = ref;
 167                        start = NULL;
 168                }
 169                i++;
 170        }
 171
 172        free(buffer.buffer);
 173
 174        return refs;
 175}
 176
 177#else
 178
 179static struct ref *get_refs_via_curl(const struct transport *transport)
 180{
 181        die("Cannot fetch from '%s' without curl ...", transport->url);
 182        return NULL;
 183}
 184
 185#endif
 186
 187static const struct transport_ops curl_transport = {
 188        /* set_option */        NULL,
 189        /* get_refs_list */     get_refs_via_curl,
 190        /* fetch */             fetch_objs_via_walker,
 191        /* push */              curl_transport_push,
 192        /* disconnect */        disconnect_walker
 193};
 194
 195struct bundle_transport_data {
 196        int fd;
 197        struct bundle_header header;
 198};
 199
 200static struct ref *get_refs_from_bundle(const struct transport *transport)
 201{
 202        struct bundle_transport_data *data = transport->data;
 203        struct ref *result = NULL;
 204        int i;
 205
 206        if (data->fd > 0)
 207                close(data->fd);
 208        data->fd = read_bundle_header(transport->url, &data->header);
 209        if (data->fd < 0)
 210                die ("Could not read bundle '%s'.", transport->url);
 211        for (i = 0; i < data->header.references.nr; i++) {
 212                struct ref_list_entry *e = data->header.references.list + i;
 213                struct ref *ref = alloc_ref(strlen(e->name));
 214                hashcpy(ref->old_sha1, e->sha1);
 215                strcpy(ref->name, e->name);
 216                ref->next = result;
 217                result = ref;
 218        }
 219        return result;
 220}
 221
 222static int fetch_refs_from_bundle(struct transport *transport,
 223                               int nr_heads, struct ref **to_fetch)
 224{
 225        struct bundle_transport_data *data = transport->data;
 226        return unbundle(&data->header, data->fd);
 227}
 228
 229static int close_bundle(struct transport *transport)
 230{
 231        struct bundle_transport_data *data = transport->data;
 232        if (data->fd > 0)
 233                close(data->fd);
 234        return 0;
 235}
 236
 237static const struct transport_ops bundle_transport = {
 238        /* set_option */        NULL,
 239        /* get_refs_list */     get_refs_from_bundle,
 240        /* fetch */             fetch_refs_from_bundle,
 241        /* push */              NULL,
 242        /* disconnect */        close_bundle
 243};
 244
 245struct git_transport_data {
 246        unsigned thin : 1;
 247        unsigned keep : 1;
 248
 249        int unpacklimit;
 250
 251        int depth;
 252
 253        const char *uploadpack;
 254        const char *receivepack;
 255};
 256
 257static int set_git_option(struct transport *connection,
 258                          const char *name, const char *value)
 259{
 260        struct git_transport_data *data = connection->data;
 261        if (!strcmp(name, TRANS_OPT_UPLOADPACK)) {
 262                data->uploadpack = value;
 263                return 0;
 264        } else if (!strcmp(name, TRANS_OPT_RECEIVEPACK)) {
 265                data->receivepack = value;
 266                return 0;
 267        } else if (!strcmp(name, TRANS_OPT_THIN)) {
 268                data->thin = !!value;
 269                return 0;
 270        } else if (!strcmp(name, TRANS_OPT_KEEP)) {
 271                data->keep = !!value;
 272                return 0;
 273        } else if (!strcmp(name, TRANS_OPT_UNPACKLIMIT)) {
 274                data->unpacklimit = atoi(value);
 275                return 0;
 276        } else if (!strcmp(name, TRANS_OPT_DEPTH)) {
 277                if (!value)
 278                        data->depth = 0;
 279                else
 280                        data->depth = atoi(value);
 281                return 0;
 282        }
 283        return 1;
 284}
 285
 286static struct ref *get_refs_via_connect(const struct transport *transport)
 287{
 288        struct git_transport_data *data = transport->data;
 289        struct ref *refs;
 290        int fd[2];
 291        pid_t pid;
 292        char *dest = xstrdup(transport->url);
 293
 294        pid = git_connect(fd, dest, data->uploadpack, 0);
 295
 296        if (pid < 0)
 297                die("Failed to connect to \"%s\"", transport->url);
 298
 299        get_remote_heads(fd[0], &refs, 0, NULL, 0);
 300        packet_flush(fd[1]);
 301
 302        finish_connect(pid);
 303
 304        free(dest);
 305
 306        return refs;
 307}
 308
 309static int fetch_refs_via_pack(struct transport *transport,
 310                               int nr_heads, struct ref **to_fetch)
 311{
 312        struct git_transport_data *data = transport->data;
 313        char **heads = xmalloc(nr_heads * sizeof(*heads));
 314        char **origh = xmalloc(nr_heads * sizeof(*origh));
 315        struct ref *refs;
 316        char *dest = xstrdup(transport->url);
 317        struct fetch_pack_args args;
 318        int i;
 319
 320        args.uploadpack = data->uploadpack;
 321        args.quiet = 0;
 322        args.keep_pack = data->keep;
 323        args.unpacklimit = data->unpacklimit;
 324        args.use_thin_pack = data->thin;
 325        args.fetch_all = 0;
 326        args.verbose = transport->verbose;
 327        args.depth = data->depth;
 328        args.no_progress = 0;
 329
 330        setup_fetch_pack(&args);
 331
 332        for (i = 0; i < nr_heads; i++)
 333                origh[i] = heads[i] = xstrdup(to_fetch[i]->name);
 334        refs = fetch_pack(dest, nr_heads, heads, &transport->pack_lockfile);
 335
 336        for (i = 0; i < nr_heads; i++)
 337                free(origh[i]);
 338        free(origh);
 339        free(heads);
 340        free_refs(refs);
 341        free(dest);
 342        return 0;
 343}
 344
 345static int git_transport_push(struct transport *transport, int refspec_nr, const char **refspec, int flags) {
 346        struct git_transport_data *data = transport->data;
 347        const char **argv;
 348        char *rem;
 349        int argc;
 350        int err;
 351
 352        argv = xmalloc((refspec_nr + 11) * sizeof(char *));
 353        argv[0] = "send-pack";
 354        argc = 1;
 355        if (flags & TRANSPORT_PUSH_ALL)
 356                argv[argc++] = "--all";
 357        if (flags & TRANSPORT_PUSH_FORCE)
 358                argv[argc++] = "--force";
 359        if (data->receivepack) {
 360                char *rp = xmalloc(strlen(data->receivepack) + 16);
 361                sprintf(rp, "--receive-pack=%s", data->receivepack);
 362                argv[argc++] = rp;
 363        }
 364        if (data->thin)
 365                argv[argc++] = "--thin";
 366        rem = xmalloc(strlen(transport->remote->name) + 10);
 367        sprintf(rem, "--remote=%s", transport->remote->name);
 368        argv[argc++] = rem;
 369        argv[argc++] = transport->url;
 370        while (refspec_nr--)
 371                argv[argc++] = *refspec++;
 372        argv[argc] = NULL;
 373        err = run_command_v_opt(argv, RUN_GIT_CMD);
 374        switch (err) {
 375        case -ERR_RUN_COMMAND_FORK:
 376                error("unable to fork for %s", argv[0]);
 377        case -ERR_RUN_COMMAND_EXEC:
 378                error("unable to exec %s", argv[0]);
 379                break;
 380        case -ERR_RUN_COMMAND_WAITPID:
 381        case -ERR_RUN_COMMAND_WAITPID_WRONG_PID:
 382        case -ERR_RUN_COMMAND_WAITPID_SIGNAL:
 383        case -ERR_RUN_COMMAND_WAITPID_NOEXIT:
 384                error("%s died with strange error", argv[0]);
 385        }
 386        return !!err;
 387}
 388
 389static const struct transport_ops git_transport = {
 390        /* set_option */        set_git_option,
 391        /* get_refs_list */     get_refs_via_connect,
 392        /* fetch */             fetch_refs_via_pack,
 393        /* push */              git_transport_push
 394};
 395
 396static int is_local(const char *url)
 397{
 398        const char *colon = strchr(url, ':');
 399        const char *slash = strchr(url, '/');
 400        return !colon || (slash && slash < colon);
 401}
 402
 403static int is_file(const char *url)
 404{
 405        struct stat buf;
 406        if (stat(url, &buf))
 407                return 0;
 408        return S_ISREG(buf.st_mode);
 409}
 410
 411struct transport *transport_get(struct remote *remote, const char *url,
 412                                int fetch)
 413{
 414        struct transport *ret = xcalloc(1, sizeof(*ret));
 415
 416        ret->remote = remote;
 417        ret->url = url;
 418        ret->fetch = !!fetch;
 419
 420        if (!prefixcmp(url, "rsync://")) {
 421                ret->ops = &rsync_transport;
 422        } else if (!prefixcmp(url, "http://")
 423                || !prefixcmp(url, "https://")
 424                || !prefixcmp(url, "ftp://")) {
 425                ret->ops = &curl_transport;
 426                if (fetch)
 427                        ret->data = get_http_walker(url);
 428        } else if (is_local(url) && is_file(url)) {
 429                struct bundle_transport_data *data = xcalloc(1, sizeof(*data));
 430                ret->data = data;
 431                ret->ops = &bundle_transport;
 432        } else {
 433                struct git_transport_data *data = xcalloc(1, sizeof(*data));
 434                ret->data = data;
 435                data->thin = 1;
 436                data->uploadpack = "git-upload-pack";
 437                if (remote && remote->uploadpack)
 438                        data->uploadpack = remote->uploadpack;
 439                data->receivepack = "git-receive-pack";
 440                if (remote && remote->receivepack)
 441                        data->receivepack = remote->receivepack;
 442                data->unpacklimit = -1;
 443                ret->ops = &git_transport;
 444        }
 445
 446        return ret;
 447}
 448
 449int transport_set_option(struct transport *transport,
 450                         const char *name, const char *value)
 451{
 452        int ret = 1;
 453        if (transport->ops->set_option)
 454                ret = transport->ops->set_option(transport, name, value);
 455        if (ret < 0)
 456                fprintf(stderr, "For '%s' option %s cannot be set to '%s'\n",
 457                        transport->url, name, value);
 458        if (ret > 0)
 459                fprintf(stderr, "For '%s' option %s is ignored\n",
 460                        transport->url, name);
 461        return ret;
 462}
 463
 464int transport_push(struct transport *transport,
 465                   int refspec_nr, const char **refspec, int flags)
 466{
 467        if (!transport->ops->push)
 468                return 1;
 469        return transport->ops->push(transport, refspec_nr, refspec, flags);
 470}
 471
 472struct ref *transport_get_remote_refs(struct transport *transport)
 473{
 474        if (!transport->remote_refs)
 475                transport->remote_refs =
 476                        transport->ops->get_refs_list(transport);
 477        return transport->remote_refs;
 478}
 479
 480int transport_fetch_refs(struct transport *transport, struct ref *refs)
 481{
 482        int rc;
 483        int nr_heads = 0, nr_alloc = 0;
 484        struct ref **heads = NULL;
 485        struct ref *rm;
 486
 487        for (rm = refs; rm; rm = rm->next) {
 488                if (rm->peer_ref &&
 489                    !hashcmp(rm->peer_ref->old_sha1, rm->old_sha1))
 490                        continue;
 491                ALLOC_GROW(heads, nr_heads + 1, nr_alloc);
 492                heads[nr_heads++] = rm;
 493        }
 494
 495        rc = transport->ops->fetch(transport, nr_heads, heads);
 496        free(heads);
 497        return rc;
 498}
 499
 500void transport_unlock_pack(struct transport *transport)
 501{
 502        if (transport->pack_lockfile) {
 503                unlink(transport->pack_lockfile);
 504                free(transport->pack_lockfile);
 505                transport->pack_lockfile = NULL;
 506        }
 507}
 508
 509int transport_disconnect(struct transport *transport)
 510{
 511        int ret = 0;
 512        if (transport->ops->disconnect)
 513                ret = transport->ops->disconnect(transport);
 514        free(transport);
 515        return ret;
 516}