Andrew's git - gitweb.git/blob - builtin-receive-pack.c

   1#include "cache.h"
   2#include "pack.h"
   3#include "refs.h"
   4#include "pkt-line.h"
   5#include "run-command.h"
   6#include "exec_cmd.h"
   7#include "commit.h"
   8#include "object.h"
   9#include "remote.h"
  10#include "transport.h"
  11
  12static const char receive_pack_usage[] = "git-receive-pack <git-dir>";
  13
  14static int deny_non_fast_forwards = 0;
  15static int receive_fsck_objects;
  16static int receive_unpack_limit = -1;
  17static int transfer_unpack_limit = -1;
  18static int unpack_limit = 100;
  19static int report_status;
  20
  21static char capabilities[] = " report-status delete-refs ";
  22static int capabilities_sent;
  23
  24static int receive_pack_config(const char *var, const char *value, void *cb)
  25{
  26        if (strcmp(var, "receive.denynonfastforwards") == 0) {
  27                deny_non_fast_forwards = git_config_bool(var, value);
  28                return 0;
  29        }
  30
  31        if (strcmp(var, "receive.unpacklimit") == 0) {
  32                receive_unpack_limit = git_config_int(var, value);
  33                return 0;
  34        }
  35
  36        if (strcmp(var, "transfer.unpacklimit") == 0) {
  37                transfer_unpack_limit = git_config_int(var, value);
  38                return 0;
  39        }
  40
  41        if (strcmp(var, "receive.fsckobjects") == 0) {
  42                receive_fsck_objects = git_config_bool(var, value);
  43                return 0;
  44        }
  45
  46        return git_default_config(var, value, cb);
  47}
  48
  49static int show_ref(const char *path, const unsigned char *sha1, int flag, void *cb_data)
  50{
  51        if (capabilities_sent)
  52                packet_write(1, "%s %s\n", sha1_to_hex(sha1), path);
  53        else
  54                packet_write(1, "%s %s%c%s\n",
  55                             sha1_to_hex(sha1), path, 0, capabilities);
  56        capabilities_sent = 1;
  57        return 0;
  58}
  59
  60static void write_head_info(void)
  61{
  62        for_each_ref(show_ref, NULL);
  63        if (!capabilities_sent)
  64                show_ref("capabilities^{}", null_sha1, 0, NULL);
  65
  66}
  67
  68struct command {
  69        struct command *next;
  70        const char *error_string;
  71        unsigned char old_sha1[20];
  72        unsigned char new_sha1[20];
  73        char ref_name[FLEX_ARRAY]; /* more */
  74};
  75
  76static struct command *commands;
  77
  78static const char pre_receive_hook[] = "hooks/pre-receive";
  79static const char post_receive_hook[] = "hooks/post-receive";
  80
  81static int hook_status(int code, const char *hook_name)
  82{
  83        switch (code) {
  84        case 0:
  85                return 0;
  86        case -ERR_RUN_COMMAND_FORK:
  87                return error("hook fork failed");
  88        case -ERR_RUN_COMMAND_EXEC:
  89                return error("hook execute failed");
  90        case -ERR_RUN_COMMAND_PIPE:
  91                return error("hook pipe failed");
  92        case -ERR_RUN_COMMAND_WAITPID:
  93                return error("waitpid failed");
  94        case -ERR_RUN_COMMAND_WAITPID_WRONG_PID:
  95                return error("waitpid is confused");
  96        case -ERR_RUN_COMMAND_WAITPID_SIGNAL:
  97                return error("%s died of signal", hook_name);
  98        case -ERR_RUN_COMMAND_WAITPID_NOEXIT:
  99                return error("%s died strangely", hook_name);
 100        default:
 101                error("%s exited with error code %d", hook_name, -code);
 102                return -code;
 103        }
 104}
 105
 106static int run_hook(const char *hook_name)
 107{
 108        static char buf[sizeof(commands->old_sha1) * 2 + PATH_MAX + 4];
 109        struct command *cmd;
 110        struct child_process proc;
 111        const char *argv[2];
 112        int have_input = 0, code;
 113
 114        for (cmd = commands; !have_input && cmd; cmd = cmd->next) {
 115                if (!cmd->error_string)
 116                        have_input = 1;
 117        }
 118
 119        if (!have_input || access(hook_name, X_OK) < 0)
 120                return 0;
 121
 122        argv[0] = hook_name;
 123        argv[1] = NULL;
 124
 125        memset(&proc, 0, sizeof(proc));
 126        proc.argv = argv;
 127        proc.in = -1;
 128        proc.stdout_to_stderr = 1;
 129
 130        code = start_command(&proc);
 131        if (code)
 132                return hook_status(code, hook_name);
 133        for (cmd = commands; cmd; cmd = cmd->next) {
 134                if (!cmd->error_string) {
 135                        size_t n = snprintf(buf, sizeof(buf), "%s %s %s\n",
 136                                sha1_to_hex(cmd->old_sha1),
 137                                sha1_to_hex(cmd->new_sha1),
 138                                cmd->ref_name);
 139                        if (write_in_full(proc.in, buf, n) != n)
 140                                break;
 141                }
 142        }
 143        close(proc.in);
 144        return hook_status(finish_command(&proc), hook_name);
 145}
 146
 147static int run_update_hook(struct command *cmd)
 148{
 149        static const char update_hook[] = "hooks/update";
 150        struct child_process proc;
 151        const char *argv[5];
 152
 153        if (access(update_hook, X_OK) < 0)
 154                return 0;
 155
 156        argv[0] = update_hook;
 157        argv[1] = cmd->ref_name;
 158        argv[2] = sha1_to_hex(cmd->old_sha1);
 159        argv[3] = sha1_to_hex(cmd->new_sha1);
 160        argv[4] = NULL;
 161
 162        memset(&proc, 0, sizeof(proc));
 163        proc.argv = argv;
 164        proc.no_stdin = 1;
 165        proc.stdout_to_stderr = 1;
 166
 167        return hook_status(run_command(&proc), update_hook);
 168}
 169
 170static const char *update(struct command *cmd)
 171{
 172        const char *name = cmd->ref_name;
 173        unsigned char *old_sha1 = cmd->old_sha1;
 174        unsigned char *new_sha1 = cmd->new_sha1;
 175        struct ref_lock *lock;
 176
 177        /* only refs/... are allowed */
 178        if (prefixcmp(name, "refs/") || check_ref_format(name + 5)) {
 179                error("refusing to create funny ref '%s' remotely", name);
 180                return "funny refname";
 181        }
 182
 183        if (!is_null_sha1(new_sha1) && !has_sha1_file(new_sha1)) {
 184                error("unpack should have generated %s, "
 185                      "but I can't find it!", sha1_to_hex(new_sha1));
 186                return "bad pack";
 187        }
 188        if (deny_non_fast_forwards && !is_null_sha1(new_sha1) &&
 189            !is_null_sha1(old_sha1) &&
 190            !prefixcmp(name, "refs/heads/")) {
 191                struct object *old_object, *new_object;
 192                struct commit *old_commit, *new_commit;
 193                struct commit_list *bases, *ent;
 194
 195                old_object = parse_object(old_sha1);
 196                new_object = parse_object(new_sha1);
 197
 198                if (!old_object || !new_object ||
 199                    old_object->type != OBJ_COMMIT ||
 200                    new_object->type != OBJ_COMMIT) {
 201                        error("bad sha1 objects for %s", name);
 202                        return "bad ref";
 203                }
 204                old_commit = (struct commit *)old_object;
 205                new_commit = (struct commit *)new_object;
 206                bases = get_merge_bases(old_commit, new_commit, 1);
 207                for (ent = bases; ent; ent = ent->next)
 208                        if (!hashcmp(old_sha1, ent->item->object.sha1))
 209                                break;
 210                free_commit_list(bases);
 211                if (!ent) {
 212                        error("denying non-fast forward %s"
 213                              " (you should pull first)", name);
 214                        return "non-fast forward";
 215                }
 216        }
 217        if (run_update_hook(cmd)) {
 218                error("hook declined to update %s", name);
 219                return "hook declined";
 220        }
 221
 222        if (is_null_sha1(new_sha1)) {
 223                if (!parse_object(old_sha1)) {
 224                        warning ("Allowing deletion of corrupt ref.");
 225                        old_sha1 = NULL;
 226                }
 227                if (delete_ref(name, old_sha1)) {
 228                        error("failed to delete %s", name);
 229                        return "failed to delete";
 230                }
 231                return NULL; /* good */
 232        }
 233        else {
 234                lock = lock_any_ref_for_update(name, old_sha1, 0);
 235                if (!lock) {
 236                        error("failed to lock %s", name);
 237                        return "failed to lock";
 238                }
 239                if (write_ref_sha1(lock, new_sha1, "push")) {
 240                        return "failed to write"; /* error() already called */
 241                }
 242                return NULL; /* good */
 243        }
 244}
 245
 246static char update_post_hook[] = "hooks/post-update";
 247
 248static void run_update_post_hook(struct command *cmd)
 249{
 250        struct command *cmd_p;
 251        int argc;
 252        const char **argv;
 253
 254        for (argc = 0, cmd_p = cmd; cmd_p; cmd_p = cmd_p->next) {
 255                if (cmd_p->error_string)
 256                        continue;
 257                argc++;
 258        }
 259        if (!argc || access(update_post_hook, X_OK) < 0)
 260                return;
 261        argv = xmalloc(sizeof(*argv) * (2 + argc));
 262        argv[0] = update_post_hook;
 263
 264        for (argc = 1, cmd_p = cmd; cmd_p; cmd_p = cmd_p->next) {
 265                char *p;
 266                if (cmd_p->error_string)
 267                        continue;
 268                p = xmalloc(strlen(cmd_p->ref_name) + 1);
 269                strcpy(p, cmd_p->ref_name);
 270                argv[argc] = p;
 271                argc++;
 272        }
 273        argv[argc] = NULL;
 274        run_command_v_opt(argv, RUN_COMMAND_NO_STDIN
 275                | RUN_COMMAND_STDOUT_TO_STDERR);
 276}
 277
 278static void execute_commands(const char *unpacker_error)
 279{
 280        struct command *cmd = commands;
 281
 282        if (unpacker_error) {
 283                while (cmd) {
 284                        cmd->error_string = "n/a (unpacker error)";
 285                        cmd = cmd->next;
 286                }
 287                return;
 288        }
 289
 290        if (run_hook(pre_receive_hook)) {
 291                while (cmd) {
 292                        cmd->error_string = "pre-receive hook declined";
 293                        cmd = cmd->next;
 294                }
 295                return;
 296        }
 297
 298        while (cmd) {
 299                cmd->error_string = update(cmd);
 300                cmd = cmd->next;
 301        }
 302}
 303
 304static void read_head_info(void)
 305{
 306        struct command **p = &commands;
 307        for (;;) {
 308                static char line[1000];
 309                unsigned char old_sha1[20], new_sha1[20];
 310                struct command *cmd;
 311                char *refname;
 312                int len, reflen;
 313
 314                len = packet_read_line(0, line, sizeof(line));
 315                if (!len)
 316                        break;
 317                if (line[len-1] == '\n')
 318                        line[--len] = 0;
 319                if (len < 83 ||
 320                    line[40] != ' ' ||
 321                    line[81] != ' ' ||
 322                    get_sha1_hex(line, old_sha1) ||
 323                    get_sha1_hex(line + 41, new_sha1))
 324                        die("protocol error: expected old/new/ref, got '%s'",
 325                            line);
 326
 327                refname = line + 82;
 328                reflen = strlen(refname);
 329                if (reflen + 82 < len) {
 330                        if (strstr(refname + reflen + 1, "report-status"))
 331                                report_status = 1;
 332                }
 333                cmd = xmalloc(sizeof(struct command) + len - 80);
 334                hashcpy(cmd->old_sha1, old_sha1);
 335                hashcpy(cmd->new_sha1, new_sha1);
 336                memcpy(cmd->ref_name, line + 82, len - 81);
 337                cmd->error_string = NULL;
 338                cmd->next = NULL;
 339                *p = cmd;
 340                p = &cmd->next;
 341        }
 342}
 343
 344static const char *parse_pack_header(struct pack_header *hdr)
 345{
 346        switch (read_pack_header(0, hdr)) {
 347        case PH_ERROR_EOF:
 348                return "eof before pack header was fully read";
 349
 350        case PH_ERROR_PACK_SIGNATURE:
 351                return "protocol error (pack signature mismatch detected)";
 352
 353        case PH_ERROR_PROTOCOL:
 354                return "protocol error (pack version unsupported)";
 355
 356        default:
 357                return "unknown error in parse_pack_header";
 358
 359        case 0:
 360                return NULL;
 361        }
 362}
 363
 364static const char *pack_lockfile;
 365
 366static const char *unpack(void)
 367{
 368        struct pack_header hdr;
 369        const char *hdr_err;
 370        char hdr_arg[38];
 371
 372        hdr_err = parse_pack_header(&hdr);
 373        if (hdr_err)
 374                return hdr_err;
 375        snprintf(hdr_arg, sizeof(hdr_arg),
 376                        "--pack_header=%"PRIu32",%"PRIu32,
 377                        ntohl(hdr.hdr_version), ntohl(hdr.hdr_entries));
 378
 379        if (ntohl(hdr.hdr_entries) < unpack_limit) {
 380                int code, i = 0;
 381                const char *unpacker[4];
 382                unpacker[i++] = "unpack-objects";
 383                if (receive_fsck_objects)
 384                        unpacker[i++] = "--strict";
 385                unpacker[i++] = hdr_arg;
 386                unpacker[i++] = NULL;
 387                code = run_command_v_opt(unpacker, RUN_GIT_CMD);
 388                switch (code) {
 389                case 0:
 390                        return NULL;
 391                case -ERR_RUN_COMMAND_FORK:
 392                        return "unpack fork failed";
 393                case -ERR_RUN_COMMAND_EXEC:
 394                        return "unpack execute failed";
 395                case -ERR_RUN_COMMAND_WAITPID:
 396                        return "waitpid failed";
 397                case -ERR_RUN_COMMAND_WAITPID_WRONG_PID:
 398                        return "waitpid is confused";
 399                case -ERR_RUN_COMMAND_WAITPID_SIGNAL:
 400                        return "unpacker died of signal";
 401                case -ERR_RUN_COMMAND_WAITPID_NOEXIT:
 402                        return "unpacker died strangely";
 403                default:
 404                        return "unpacker exited with error code";
 405                }
 406        } else {
 407                const char *keeper[7];
 408                int s, status, i = 0;
 409                char keep_arg[256];
 410                struct child_process ip;
 411
 412                s = sprintf(keep_arg, "--keep=receive-pack %"PRIuMAX" on ", (uintmax_t) getpid());
 413                if (gethostname(keep_arg + s, sizeof(keep_arg) - s))
 414                        strcpy(keep_arg + s, "localhost");
 415
 416                keeper[i++] = "index-pack";
 417                keeper[i++] = "--stdin";
 418                if (receive_fsck_objects)
 419                        keeper[i++] = "--strict";
 420                keeper[i++] = "--fix-thin";
 421                keeper[i++] = hdr_arg;
 422                keeper[i++] = keep_arg;
 423                keeper[i++] = NULL;
 424                memset(&ip, 0, sizeof(ip));
 425                ip.argv = keeper;
 426                ip.out = -1;
 427                ip.git_cmd = 1;
 428                if (start_command(&ip))
 429                        return "index-pack fork failed";
 430                pack_lockfile = index_pack_lockfile(ip.out);
 431                close(ip.out);
 432                status = finish_command(&ip);
 433                if (!status) {
 434                        reprepare_packed_git();
 435                        return NULL;
 436                }
 437                return "index-pack abnormal exit";
 438        }
 439}
 440
 441static void report(const char *unpack_status)
 442{
 443        struct command *cmd;
 444        packet_write(1, "unpack %s\n",
 445                     unpack_status ? unpack_status : "ok");
 446        for (cmd = commands; cmd; cmd = cmd->next) {
 447                if (!cmd->error_string)
 448                        packet_write(1, "ok %s\n",
 449                                     cmd->ref_name);
 450                else
 451                        packet_write(1, "ng %s %s\n",
 452                                     cmd->ref_name, cmd->error_string);
 453        }
 454        packet_flush(1);
 455}
 456
 457static int delete_only(struct command *cmd)
 458{
 459        while (cmd) {
 460                if (!is_null_sha1(cmd->new_sha1))
 461                        return 0;
 462                cmd = cmd->next;
 463        }
 464        return 1;
 465}
 466
 467static int add_refs_from_alternate(struct alternate_object_database *e, void *unused)
 468{
 469        char *other = xstrdup(make_absolute_path(e->base));
 470        size_t len = strlen(other);
 471        struct remote *remote;
 472        struct transport *transport;
 473        const struct ref *extra;
 474
 475        while (other[len-1] == '/')
 476                other[--len] = '\0';
 477        if (len < 8 || memcmp(other + len - 8, "/objects", 8))
 478                return 0;
 479        /* Is this a git repository with refs? */
 480        memcpy(other + len - 8, "/refs", 6);
 481        if (!is_directory(other))
 482                return 0;
 483        other[len - 8] = '\0';
 484        remote = remote_get(other);
 485        transport = transport_get(remote, other);
 486        for (extra = transport_get_remote_refs(transport);
 487             extra;
 488             extra = extra->next) {
 489                add_extra_ref(".have", extra->old_sha1, 0);
 490        }
 491        transport_disconnect(transport);
 492        free(other);
 493        return 0;
 494}
 495
 496static void add_alternate_refs(void)
 497{
 498        foreach_alt_odb(add_refs_from_alternate, NULL);
 499}
 500
 501int cmd_receive_pack(int argc, const char **argv, const char *prefix)
 502{
 503        int i;
 504        char *dir = NULL;
 505
 506        argv++;
 507        for (i = 1; i < argc; i++) {
 508                const char *arg = *argv++;
 509
 510                if (*arg == '-') {
 511                        /* Do flag handling here */
 512                        usage(receive_pack_usage);
 513                }
 514                if (dir)
 515                        usage(receive_pack_usage);
 516                dir = xstrdup(arg);
 517        }
 518        if (!dir)
 519                usage(receive_pack_usage);
 520
 521        setup_path();
 522
 523        if (!enter_repo(dir, 0))
 524                die("'%s': unable to chdir or not a git archive", dir);
 525
 526        if (is_repository_shallow())
 527                die("attempt to push into a shallow repository");
 528
 529        git_config(receive_pack_config, NULL);
 530
 531        if (0 <= transfer_unpack_limit)
 532                unpack_limit = transfer_unpack_limit;
 533        else if (0 <= receive_unpack_limit)
 534                unpack_limit = receive_unpack_limit;
 535
 536        add_alternate_refs();
 537        write_head_info();
 538        clear_extra_refs();
 539
 540        /* EOF */
 541        packet_flush(1);
 542
 543        read_head_info();
 544        if (commands) {
 545                const char *unpack_status = NULL;
 546
 547                if (!delete_only(commands))
 548                        unpack_status = unpack();
 549                execute_commands(unpack_status);
 550                if (pack_lockfile)
 551                        unlink(pack_lockfile);
 552                if (report_status)
 553                        report(unpack_status);
 554                run_hook(post_receive_hook);
 555                run_update_post_hook(commands);
 556        }
 557        return 0;
 558}