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        /* only refs/... are allowed */
 169        if (prefixcmp(name, "refs/") || check_ref_format(name + 5)) {
 170                error("refusing to create funny ref '%s' remotely", name);
 171                return "funny refname";
 172        }
 173
 174        if (!is_null_sha1(new_sha1) && !has_sha1_file(new_sha1)) {
 175                error("unpack should have generated %s, "
 176                      "but I can't find it!", sha1_to_hex(new_sha1));
 177                return "bad pack";
 178        }
 179        if (deny_non_fast_forwards && !is_null_sha1(new_sha1) &&
 180            !is_null_sha1(old_sha1) &&
 181            !prefixcmp(name, "refs/heads/")) {
 182                struct object *old_object, *new_object;
 183                struct commit *old_commit, *new_commit;
 184                struct commit_list *bases, *ent;
 185
 186                old_object = parse_object(old_sha1);
 187                new_object = parse_object(new_sha1);
 188
 189                if (!old_object || !new_object ||
 190                    old_object->type != OBJ_COMMIT ||
 191                    new_object->type != OBJ_COMMIT) {
 192                        error("bad sha1 objects for %s", name);
 193                        return "bad ref";
 194                }
 195                old_commit = (struct commit *)old_object;
 196                new_commit = (struct commit *)new_object;
 197                bases = get_merge_bases(old_commit, new_commit, 1);
 198                for (ent = bases; ent; ent = ent->next)
 199                        if (!hashcmp(old_sha1, ent->item->object.sha1))
 200                                break;
 201                free_commit_list(bases);
 202                if (!ent) {
 203                        error("denying non-fast forward %s"
 204                              " (you should pull first)", name);
 205                        return "non-fast forward";
 206                }
 207        }
 208        if (run_update_hook(cmd)) {
 209                error("hook declined to update %s", name);
 210                return "hook declined";
 211        }
 212
 213        if (is_null_sha1(new_sha1)) {
 214                if (!parse_object(old_sha1)) {
 215                        warning ("Allowing deletion of corrupt ref.");
 216                        old_sha1 = NULL;
 217                }
 218                if (delete_ref(name, old_sha1)) {
 219                        error("failed to delete %s", name);
 220                        return "failed to delete";
 221                }
 222                return NULL; /* good */
 223        }
 224        else {
 225                lock = lock_any_ref_for_update(name, old_sha1, 0);
 226                if (!lock) {
 227                        error("failed to lock %s", name);
 228                        return "failed to lock";
 229                }
 230                if (write_ref_sha1(lock, new_sha1, "push")) {
 231                        return "failed to write"; /* error() already called */
 232                }
 233                return NULL; /* good */
 234        }
 235}
 236
 237static char update_post_hook[] = "hooks/post-update";
 238
 239static void run_update_post_hook(struct command *cmd)
 240{
 241        struct command *cmd_p;
 242        int argc;
 243        const char **argv;
 244
 245        for (argc = 0, cmd_p = cmd; cmd_p; cmd_p = cmd_p->next) {
 246                if (cmd_p->error_string)
 247                        continue;
 248                argc++;
 249        }
 250        if (!argc || access(update_post_hook, X_OK) < 0)
 251                return;
 252        argv = xmalloc(sizeof(*argv) * (2 + argc));
 253        argv[0] = update_post_hook;
 254
 255        for (argc = 1, cmd_p = cmd; cmd_p; cmd_p = cmd_p->next) {
 256                char *p;
 257                if (cmd_p->error_string)
 258                        continue;
 259                p = xmalloc(strlen(cmd_p->ref_name) + 1);
 260                strcpy(p, cmd_p->ref_name);
 261                argv[argc] = p;
 262                argc++;
 263        }
 264        argv[argc] = NULL;
 265        run_command_v_opt(argv, RUN_COMMAND_NO_STDIN
 266                | RUN_COMMAND_STDOUT_TO_STDERR);
 267}
 268
 269static void execute_commands(const char *unpacker_error)
 270{
 271        struct command *cmd = commands;
 272
 273        if (unpacker_error) {
 274                while (cmd) {
 275                        cmd->error_string = "n/a (unpacker error)";
 276                        cmd = cmd->next;
 277                }
 278                return;
 279        }
 280
 281        if (run_hook(pre_receive_hook)) {
 282                while (cmd) {
 283                        cmd->error_string = "pre-receive hook declined";
 284                        cmd = cmd->next;
 285                }
 286                return;
 287        }
 288
 289        while (cmd) {
 290                cmd->error_string = update(cmd);
 291                cmd = cmd->next;
 292        }
 293}
 294
 295static void read_head_info(void)
 296{
 297        struct command **p = &commands;
 298        for (;;) {
 299                static char line[1000];
 300                unsigned char old_sha1[20], new_sha1[20];
 301                struct command *cmd;
 302                char *refname;
 303                int len, reflen;
 304
 305                len = packet_read_line(0, line, sizeof(line));
 306                if (!len)
 307                        break;
 308                if (line[len-1] == '\n')
 309                        line[--len] = 0;
 310                if (len < 83 ||
 311                    line[40] != ' ' ||
 312                    line[81] != ' ' ||
 313                    get_sha1_hex(line, old_sha1) ||
 314                    get_sha1_hex(line + 41, new_sha1))
 315                        die("protocol error: expected old/new/ref, got '%s'",
 316                            line);
 317
 318                refname = line + 82;
 319                reflen = strlen(refname);
 320                if (reflen + 82 < len) {
 321                        if (strstr(refname + reflen + 1, "report-status"))
 322                                report_status = 1;
 323                }
 324                cmd = xmalloc(sizeof(struct command) + len - 80);
 325                hashcpy(cmd->old_sha1, old_sha1);
 326                hashcpy(cmd->new_sha1, new_sha1);
 327                memcpy(cmd->ref_name, line + 82, len - 81);
 328                cmd->error_string = NULL;
 329                cmd->next = NULL;
 330                *p = cmd;
 331                p = &cmd->next;
 332        }
 333}
 334
 335static const char *parse_pack_header(struct pack_header *hdr)
 336{
 337        switch (read_pack_header(0, hdr)) {
 338        case PH_ERROR_EOF:
 339                return "eof before pack header was fully read";
 340
 341        case PH_ERROR_PACK_SIGNATURE:
 342                return "protocol error (pack signature mismatch detected)";
 343
 344        case PH_ERROR_PROTOCOL:
 345                return "protocol error (pack version unsupported)";
 346
 347        default:
 348                return "unknown error in parse_pack_header";
 349
 350        case 0:
 351                return NULL;
 352        }
 353}
 354
 355static const char *pack_lockfile;
 356
 357static const char *unpack(void)
 358{
 359        struct pack_header hdr;
 360        const char *hdr_err;
 361        char hdr_arg[38];
 362
 363        hdr_err = parse_pack_header(&hdr);
 364        if (hdr_err)
 365                return hdr_err;
 366        snprintf(hdr_arg, sizeof(hdr_arg), "--pack_header=%u,%u",
 367                        ntohl(hdr.hdr_version), ntohl(hdr.hdr_entries));
 368
 369        if (ntohl(hdr.hdr_entries) < unpack_limit) {
 370                int code;
 371                const char *unpacker[3];
 372                unpacker[0] = "unpack-objects";
 373                unpacker[1] = hdr_arg;
 374                unpacker[2] = NULL;
 375                code = run_command_v_opt(unpacker, RUN_GIT_CMD);
 376                switch (code) {
 377                case 0:
 378                        return NULL;
 379                case -ERR_RUN_COMMAND_FORK:
 380                        return "unpack fork failed";
 381                case -ERR_RUN_COMMAND_EXEC:
 382                        return "unpack execute failed";
 383                case -ERR_RUN_COMMAND_WAITPID:
 384                        return "waitpid failed";
 385                case -ERR_RUN_COMMAND_WAITPID_WRONG_PID:
 386                        return "waitpid is confused";
 387                case -ERR_RUN_COMMAND_WAITPID_SIGNAL:
 388                        return "unpacker died of signal";
 389                case -ERR_RUN_COMMAND_WAITPID_NOEXIT:
 390                        return "unpacker died strangely";
 391                default:
 392                        return "unpacker exited with error code";
 393                }
 394        } else {
 395                const char *keeper[6];
 396                int s, status;
 397                char keep_arg[256];
 398                struct child_process ip;
 399
 400                s = sprintf(keep_arg, "--keep=receive-pack %i on ", getpid());
 401                if (gethostname(keep_arg + s, sizeof(keep_arg) - s))
 402                        strcpy(keep_arg + s, "localhost");
 403
 404                keeper[0] = "index-pack";
 405                keeper[1] = "--stdin";
 406                keeper[2] = "--fix-thin";
 407                keeper[3] = hdr_arg;
 408                keeper[4] = keep_arg;
 409                keeper[5] = NULL;
 410                memset(&ip, 0, sizeof(ip));
 411                ip.argv = keeper;
 412                ip.out = -1;
 413                ip.git_cmd = 1;
 414                if (start_command(&ip))
 415                        return "index-pack fork failed";
 416                pack_lockfile = index_pack_lockfile(ip.out);
 417                status = finish_command(&ip);
 418                if (!status) {
 419                        reprepare_packed_git();
 420                        return NULL;
 421                }
 422                return "index-pack abnormal exit";
 423        }
 424}
 425
 426static void report(const char *unpack_status)
 427{
 428        struct command *cmd;
 429        packet_write(1, "unpack %s\n",
 430                     unpack_status ? unpack_status : "ok");
 431        for (cmd = commands; cmd; cmd = cmd->next) {
 432                if (!cmd->error_string)
 433                        packet_write(1, "ok %s\n",
 434                                     cmd->ref_name);
 435                else
 436                        packet_write(1, "ng %s %s\n",
 437                                     cmd->ref_name, cmd->error_string);
 438        }
 439        packet_flush(1);
 440}
 441
 442static int delete_only(struct command *cmd)
 443{
 444        while (cmd) {
 445                if (!is_null_sha1(cmd->new_sha1))
 446                        return 0;
 447                cmd = cmd->next;
 448        }
 449        return 1;
 450}
 451
 452int main(int argc, char **argv)
 453{
 454        int i;
 455        char *dir = NULL;
 456
 457        argv++;
 458        for (i = 1; i < argc; i++) {
 459                char *arg = *argv++;
 460
 461                if (*arg == '-') {
 462                        /* Do flag handling here */
 463                        usage(receive_pack_usage);
 464                }
 465                if (dir)
 466                        usage(receive_pack_usage);
 467                dir = arg;
 468        }
 469        if (!dir)
 470                usage(receive_pack_usage);
 471
 472        if (!enter_repo(dir, 0))
 473                die("'%s': unable to chdir or not a git archive", dir);
 474
 475        if (is_repository_shallow())
 476                die("attempt to push into a shallow repository");
 477
 478        git_config(receive_pack_config);
 479
 480        if (0 <= transfer_unpack_limit)
 481                unpack_limit = transfer_unpack_limit;
 482        else if (0 <= receive_unpack_limit)
 483                unpack_limit = receive_unpack_limit;
 484
 485        write_head_info();
 486
 487        /* EOF */
 488        packet_flush(1);
 489
 490        read_head_info();
 491        if (commands) {
 492                const char *unpack_status = NULL;
 493
 494                if (!delete_only(commands))
 495                        unpack_status = unpack();
 496                execute_commands(unpack_status);
 497                if (pack_lockfile)
 498                        unlink(pack_lockfile);
 499                if (report_status)
 500                        report(unpack_status);
 501                run_hook(post_receive_hook);
 502                run_update_post_hook(commands);
 503        }
 504        return 0;
 505}