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_WAITPID:
  83                return error("waitpid failed");
  84        case -ERR_RUN_COMMAND_WAITPID_WRONG_PID:
  85                return error("waitpid is confused");
  86        case -ERR_RUN_COMMAND_WAITPID_SIGNAL:
  87                return error("%s died of signal", hook_name);
  88        case -ERR_RUN_COMMAND_WAITPID_NOEXIT:
  89                return error("%s died strangely", hook_name);
  90        default:
  91                error("%s exited with error code %d", hook_name, -code);
  92                return -code;
  93        }
  94}
  95
  96static int run_hook(const char *hook_name,
  97        struct command *first_cmd,
  98        int single)
  99{
 100        struct command *cmd;
 101        int argc, code;
 102        const char **argv;
 103
 104        for (argc = 0, cmd = first_cmd; cmd; cmd = cmd->next) {
 105                if (!cmd->error_string)
 106                        argc += 3;
 107                if (single)
 108                        break;
 109        }
 110
 111        if (!argc || access(hook_name, X_OK) < 0)
 112                return 0;
 113
 114        argv = xmalloc(sizeof(*argv) * (2 + argc));
 115        argv[0] = hook_name;
 116        for (argc = 1, cmd = first_cmd; cmd; cmd = cmd->next) {
 117                if (!cmd->error_string) {
 118                        argv[argc++] = xstrdup(cmd->ref_name);
 119                        argv[argc++] = xstrdup(sha1_to_hex(cmd->old_sha1));
 120                        argv[argc++] = xstrdup(sha1_to_hex(cmd->new_sha1));
 121                }
 122                if (single)
 123                        break;
 124        }
 125        argv[argc] = NULL;
 126
 127        code = run_command_v_opt(argv,
 128                RUN_COMMAND_NO_STDIN | RUN_COMMAND_STDOUT_TO_STDERR);
 129        while (--argc > 0)
 130                free((char*)argv[argc]);
 131        free(argv);
 132
 133        return hook_status(code, hook_name);
 134}
 135
 136static int run_update_hook(struct command *cmd)
 137{
 138        static const char update_hook[] = "hooks/update";
 139        struct child_process proc;
 140        const char *argv[5];
 141
 142        if (access(update_hook, X_OK) < 0)
 143                return 0;
 144
 145        argv[0] = update_hook;
 146        argv[1] = cmd->ref_name;
 147        argv[2] = sha1_to_hex(cmd->old_sha1);
 148        argv[3] = sha1_to_hex(cmd->new_sha1);
 149        argv[4] = NULL;
 150
 151        memset(&proc, 0, sizeof(proc));
 152        proc.argv = argv;
 153        proc.no_stdin = 1;
 154        proc.stdout_to_stderr = 1;
 155
 156        return hook_status(run_command(&proc), update_hook);
 157}
 158
 159static const char *update(struct command *cmd)
 160{
 161        const char *name = cmd->ref_name;
 162        unsigned char *old_sha1 = cmd->old_sha1;
 163        unsigned char *new_sha1 = cmd->new_sha1;
 164        struct ref_lock *lock;
 165
 166        if (!prefixcmp(name, "refs/") && check_ref_format(name + 5)) {
 167                error("refusing to create funny ref '%s' locally", name);
 168                return "funny refname";
 169        }
 170
 171        if (!is_null_sha1(new_sha1) && !has_sha1_file(new_sha1)) {
 172                error("unpack should have generated %s, "
 173                      "but I can't find it!", sha1_to_hex(new_sha1));
 174                return "bad pack";
 175        }
 176        if (deny_non_fast_forwards && !is_null_sha1(new_sha1) &&
 177            !is_null_sha1(old_sha1) &&
 178            !prefixcmp(name, "refs/heads/")) {
 179                struct commit *old_commit, *new_commit;
 180                struct commit_list *bases, *ent;
 181
 182                old_commit = (struct commit *)parse_object(old_sha1);
 183                new_commit = (struct commit *)parse_object(new_sha1);
 184                bases = get_merge_bases(old_commit, new_commit, 1);
 185                for (ent = bases; ent; ent = ent->next)
 186                        if (!hashcmp(old_sha1, ent->item->object.sha1))
 187                                break;
 188                free_commit_list(bases);
 189                if (!ent) {
 190                        error("denying non-fast forward %s"
 191                              " (you should pull first)", name);
 192                        return "non-fast forward";
 193                }
 194        }
 195        if (run_update_hook(cmd)) {
 196                error("hook declined to update %s", name);
 197                return "hook declined";
 198        }
 199
 200        if (is_null_sha1(new_sha1)) {
 201                if (delete_ref(name, old_sha1)) {
 202                        error("failed to delete %s", name);
 203                        return "failed to delete";
 204                }
 205                fprintf(stderr, "%s: %s -> deleted\n", name,
 206                        sha1_to_hex(old_sha1));
 207                return NULL; /* good */
 208        }
 209        else {
 210                lock = lock_any_ref_for_update(name, old_sha1);
 211                if (!lock) {
 212                        error("failed to lock %s", name);
 213                        return "failed to lock";
 214                }
 215                if (write_ref_sha1(lock, new_sha1, "push")) {
 216                        return "failed to write"; /* error() already called */
 217                }
 218                fprintf(stderr, "%s: %s -> %s\n", name,
 219                        sha1_to_hex(old_sha1), sha1_to_hex(new_sha1));
 220                return NULL; /* good */
 221        }
 222}
 223
 224static char update_post_hook[] = "hooks/post-update";
 225
 226static void run_update_post_hook(struct command *cmd)
 227{
 228        struct command *cmd_p;
 229        int argc;
 230        const char **argv;
 231
 232        for (argc = 0, cmd_p = cmd; cmd_p; cmd_p = cmd_p->next) {
 233                if (cmd_p->error_string)
 234                        continue;
 235                argc++;
 236        }
 237        if (!argc || access(update_post_hook, X_OK) < 0)
 238                return;
 239        argv = xmalloc(sizeof(*argv) * (2 + argc));
 240        argv[0] = update_post_hook;
 241
 242        for (argc = 1, cmd_p = cmd; cmd_p; cmd_p = cmd_p->next) {
 243                char *p;
 244                if (cmd_p->error_string)
 245                        continue;
 246                p = xmalloc(strlen(cmd_p->ref_name) + 1);
 247                strcpy(p, cmd_p->ref_name);
 248                argv[argc] = p;
 249                argc++;
 250        }
 251        argv[argc] = NULL;
 252        run_command_v_opt(argv, RUN_COMMAND_NO_STDIN
 253                | RUN_COMMAND_STDOUT_TO_STDERR);
 254}
 255
 256static void execute_commands(const char *unpacker_error)
 257{
 258        struct command *cmd = commands;
 259
 260        if (unpacker_error) {
 261                while (cmd) {
 262                        cmd->error_string = "n/a (unpacker error)";
 263                        cmd = cmd->next;
 264                }
 265                return;
 266        }
 267
 268        if (run_hook(pre_receive_hook, commands, 0)) {
 269                while (cmd) {
 270                        cmd->error_string = "pre-receive hook declined";
 271                        cmd = cmd->next;
 272                }
 273                return;
 274        }
 275
 276        while (cmd) {
 277                cmd->error_string = update(cmd);
 278                cmd = cmd->next;
 279        }
 280}
 281
 282static void read_head_info(void)
 283{
 284        struct command **p = &commands;
 285        for (;;) {
 286                static char line[1000];
 287                unsigned char old_sha1[20], new_sha1[20];
 288                struct command *cmd;
 289                char *refname;
 290                int len, reflen;
 291
 292                len = packet_read_line(0, line, sizeof(line));
 293                if (!len)
 294                        break;
 295                if (line[len-1] == '\n')
 296                        line[--len] = 0;
 297                if (len < 83 ||
 298                    line[40] != ' ' ||
 299                    line[81] != ' ' ||
 300                    get_sha1_hex(line, old_sha1) ||
 301                    get_sha1_hex(line + 41, new_sha1))
 302                        die("protocol error: expected old/new/ref, got '%s'",
 303                            line);
 304
 305                refname = line + 82;
 306                reflen = strlen(refname);
 307                if (reflen + 82 < len) {
 308                        if (strstr(refname + reflen + 1, "report-status"))
 309                                report_status = 1;
 310                }
 311                cmd = xmalloc(sizeof(struct command) + len - 80);
 312                hashcpy(cmd->old_sha1, old_sha1);
 313                hashcpy(cmd->new_sha1, new_sha1);
 314                memcpy(cmd->ref_name, line + 82, len - 81);
 315                cmd->error_string = NULL;
 316                cmd->next = NULL;
 317                *p = cmd;
 318                p = &cmd->next;
 319        }
 320}
 321
 322static const char *parse_pack_header(struct pack_header *hdr)
 323{
 324        switch (read_pack_header(0, hdr)) {
 325        case PH_ERROR_EOF:
 326                return "eof before pack header was fully read";
 327
 328        case PH_ERROR_PACK_SIGNATURE:
 329                return "protocol error (pack signature mismatch detected)";
 330
 331        case PH_ERROR_PROTOCOL:
 332                return "protocol error (pack version unsupported)";
 333
 334        default:
 335                return "unknown error in parse_pack_header";
 336
 337        case 0:
 338                return NULL;
 339        }
 340}
 341
 342static const char *pack_lockfile;
 343
 344static const char *unpack(void)
 345{
 346        struct pack_header hdr;
 347        const char *hdr_err;
 348        char hdr_arg[38];
 349
 350        hdr_err = parse_pack_header(&hdr);
 351        if (hdr_err)
 352                return hdr_err;
 353        snprintf(hdr_arg, sizeof(hdr_arg), "--pack_header=%u,%u",
 354                        ntohl(hdr.hdr_version), ntohl(hdr.hdr_entries));
 355
 356        if (ntohl(hdr.hdr_entries) < unpack_limit) {
 357                int code;
 358                const char *unpacker[3];
 359                unpacker[0] = "unpack-objects";
 360                unpacker[1] = hdr_arg;
 361                unpacker[2] = NULL;
 362                code = run_command_v_opt(unpacker, RUN_GIT_CMD);
 363                switch (code) {
 364                case 0:
 365                        return NULL;
 366                case -ERR_RUN_COMMAND_FORK:
 367                        return "unpack fork failed";
 368                case -ERR_RUN_COMMAND_EXEC:
 369                        return "unpack execute failed";
 370                case -ERR_RUN_COMMAND_WAITPID:
 371                        return "waitpid failed";
 372                case -ERR_RUN_COMMAND_WAITPID_WRONG_PID:
 373                        return "waitpid is confused";
 374                case -ERR_RUN_COMMAND_WAITPID_SIGNAL:
 375                        return "unpacker died of signal";
 376                case -ERR_RUN_COMMAND_WAITPID_NOEXIT:
 377                        return "unpacker died strangely";
 378                default:
 379                        return "unpacker exited with error code";
 380                }
 381        } else {
 382                const char *keeper[6];
 383                int fd[2], s, len, status;
 384                pid_t pid;
 385                char keep_arg[256];
 386                char packname[46];
 387
 388                s = sprintf(keep_arg, "--keep=receive-pack %i on ", getpid());
 389                if (gethostname(keep_arg + s, sizeof(keep_arg) - s))
 390                        strcpy(keep_arg + s, "localhost");
 391
 392                keeper[0] = "index-pack";
 393                keeper[1] = "--stdin";
 394                keeper[2] = "--fix-thin";
 395                keeper[3] = hdr_arg;
 396                keeper[4] = keep_arg;
 397                keeper[5] = NULL;
 398
 399                if (pipe(fd) < 0)
 400                        return "index-pack pipe failed";
 401                pid = fork();
 402                if (pid < 0)
 403                        return "index-pack fork failed";
 404                if (!pid) {
 405                        dup2(fd[1], 1);
 406                        close(fd[1]);
 407                        close(fd[0]);
 408                        execv_git_cmd(keeper);
 409                        die("execv of index-pack failed");
 410                }
 411                close(fd[1]);
 412
 413                /*
 414                 * The first thing we expects from index-pack's output
 415                 * is "pack\t%40s\n" or "keep\t%40s\n" (46 bytes) where
 416                 * %40s is the newly created pack SHA1 name.  In the "keep"
 417                 * case, we need it to remove the corresponding .keep file
 418                 * later on.  If we don't get that then tough luck with it.
 419                 */
 420                for (len = 0;
 421                     len < 46 && (s = xread(fd[0], packname+len, 46-len)) > 0;
 422                     len += s);
 423                close(fd[0]);
 424                if (len == 46 && packname[45] == '\n' &&
 425                    memcmp(packname, "keep\t", 5) == 0) {
 426                        char path[PATH_MAX];
 427                        packname[45] = 0;
 428                        snprintf(path, sizeof(path), "%s/pack/pack-%s.keep",
 429                                 get_object_directory(), packname + 5);
 430                        pack_lockfile = xstrdup(path);
 431                }
 432
 433                /* Then wrap our index-pack process. */
 434                while (waitpid(pid, &status, 0) < 0)
 435                        if (errno != EINTR)
 436                                return "waitpid failed";
 437                if (WIFEXITED(status)) {
 438                        int code = WEXITSTATUS(status);
 439                        if (code)
 440                                return "index-pack exited with error code";
 441                        reprepare_packed_git();
 442                        return NULL;
 443                }
 444                return "index-pack abnormal exit";
 445        }
 446}
 447
 448static void report(const char *unpack_status)
 449{
 450        struct command *cmd;
 451        packet_write(1, "unpack %s\n",
 452                     unpack_status ? unpack_status : "ok");
 453        for (cmd = commands; cmd; cmd = cmd->next) {
 454                if (!cmd->error_string)
 455                        packet_write(1, "ok %s\n",
 456                                     cmd->ref_name);
 457                else
 458                        packet_write(1, "ng %s %s\n",
 459                                     cmd->ref_name, cmd->error_string);
 460        }
 461        packet_flush(1);
 462}
 463
 464static int delete_only(struct command *cmd)
 465{
 466        while (cmd) {
 467                if (!is_null_sha1(cmd->new_sha1))
 468                        return 0;
 469                cmd = cmd->next;
 470        }
 471        return 1;
 472}
 473
 474int main(int argc, char **argv)
 475{
 476        int i;
 477        char *dir = NULL;
 478
 479        argv++;
 480        for (i = 1; i < argc; i++) {
 481                char *arg = *argv++;
 482
 483                if (*arg == '-') {
 484                        /* Do flag handling here */
 485                        usage(receive_pack_usage);
 486                }
 487                if (dir)
 488                        usage(receive_pack_usage);
 489                dir = arg;
 490        }
 491        if (!dir)
 492                usage(receive_pack_usage);
 493
 494        if (!enter_repo(dir, 0))
 495                die("'%s': unable to chdir or not a git archive", dir);
 496
 497        if (is_repository_shallow())
 498                die("attempt to push into a shallow repository");
 499
 500        git_config(receive_pack_config);
 501
 502        if (0 <= transfer_unpack_limit)
 503                unpack_limit = transfer_unpack_limit;
 504        else if (0 <= receive_unpack_limit)
 505                unpack_limit = receive_unpack_limit;
 506
 507        write_head_info();
 508
 509        /* EOF */
 510        packet_flush(1);
 511
 512        read_head_info();
 513        if (commands) {
 514                const char *unpack_status = NULL;
 515
 516                if (!delete_only(commands))
 517                        unpack_status = unpack();
 518                execute_commands(unpack_status);
 519                if (pack_lockfile)
 520                        unlink(pack_lockfile);
 521                if (report_status)
 522                        report(unpack_status);
 523                run_hook(post_receive_hook, commands, 0);
 524                run_update_post_hook(commands);
 525        }
 526        return 0;
 527}