Andrew's git - gitweb.git/blob

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