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 update_hook[] = "hooks/update";
  71static const char pre_receive_hook[] = "hooks/pre-receive";
  72static const char post_receive_hook[] = "hooks/post-receive";
  73
  74static int hook_status(int code, const char *hook_name)
  75{
  76        switch (code) {
  77        case 0:
  78                return 0;
  79        case -ERR_RUN_COMMAND_FORK:
  80                return error("hook fork failed");
  81        case -ERR_RUN_COMMAND_EXEC:
  82                return error("hook execute failed");
  83        case -ERR_RUN_COMMAND_WAITPID:
  84                return error("waitpid failed");
  85        case -ERR_RUN_COMMAND_WAITPID_WRONG_PID:
  86                return error("waitpid is confused");
  87        case -ERR_RUN_COMMAND_WAITPID_SIGNAL:
  88                return error("%s died of signal", hook_name);
  89        case -ERR_RUN_COMMAND_WAITPID_NOEXIT:
  90                return error("%s died strangely", hook_name);
  91        default:
  92                error("%s exited with error code %d", hook_name, -code);
  93                return -code;
  94        }
  95}
  96
  97static int run_hook(const char *hook_name,
  98        struct command *first_cmd,
  99        int single)
 100{
 101        struct command *cmd;
 102        int argc, code;
 103        const char **argv;
 104
 105        for (argc = 0, cmd = first_cmd; cmd; cmd = cmd->next) {
 106                if (!cmd->error_string)
 107                        argc += 3;
 108                if (single)
 109                        break;
 110        }
 111
 112        if (!argc || access(hook_name, X_OK) < 0)
 113                return 0;
 114
 115        argv = xmalloc(sizeof(*argv) * (2 + argc));
 116        argv[0] = hook_name;
 117        for (argc = 1, cmd = first_cmd; cmd; cmd = cmd->next) {
 118                if (!cmd->error_string) {
 119                        argv[argc++] = xstrdup(cmd->ref_name);
 120                        argv[argc++] = xstrdup(sha1_to_hex(cmd->old_sha1));
 121                        argv[argc++] = xstrdup(sha1_to_hex(cmd->new_sha1));
 122                }
 123                if (single)
 124                        break;
 125        }
 126        argv[argc] = NULL;
 127
 128        code = run_command_v_opt(argv,
 129                RUN_COMMAND_NO_STDIN | RUN_COMMAND_STDOUT_TO_STDERR);
 130        while (--argc > 0)
 131                free((char*)argv[argc]);
 132        free(argv);
 133
 134        return hook_status(code, hook_name);
 135}
 136
 137static const char *update(struct command *cmd)
 138{
 139        const char *name = cmd->ref_name;
 140        unsigned char *old_sha1 = cmd->old_sha1;
 141        unsigned char *new_sha1 = cmd->new_sha1;
 142        struct ref_lock *lock;
 143
 144        if (!prefixcmp(name, "refs/") && check_ref_format(name + 5)) {
 145                error("refusing to create funny ref '%s' locally", name);
 146                return "funny refname";
 147        }
 148
 149        if (!is_null_sha1(new_sha1) && !has_sha1_file(new_sha1)) {
 150                error("unpack should have generated %s, "
 151                      "but I can't find it!", sha1_to_hex(new_sha1));
 152                return "bad pack";
 153        }
 154        if (deny_non_fast_forwards && !is_null_sha1(new_sha1) &&
 155            !is_null_sha1(old_sha1) &&
 156            !prefixcmp(name, "refs/heads/")) {
 157                struct commit *old_commit, *new_commit;
 158                struct commit_list *bases, *ent;
 159
 160                old_commit = (struct commit *)parse_object(old_sha1);
 161                new_commit = (struct commit *)parse_object(new_sha1);
 162                bases = get_merge_bases(old_commit, new_commit, 1);
 163                for (ent = bases; ent; ent = ent->next)
 164                        if (!hashcmp(old_sha1, ent->item->object.sha1))
 165                                break;
 166                free_commit_list(bases);
 167                if (!ent) {
 168                        error("denying non-fast forward %s"
 169                              " (you should pull first)", name);
 170                        return "non-fast forward";
 171                }
 172        }
 173        if (run_hook(update_hook, cmd, 1)) {
 174                error("hook declined to update %s", name);
 175                return "hook declined";
 176        }
 177
 178        if (is_null_sha1(new_sha1)) {
 179                if (delete_ref(name, old_sha1)) {
 180                        error("failed to delete %s", name);
 181                        return "failed to delete";
 182                }
 183                fprintf(stderr, "%s: %s -> deleted\n", name,
 184                        sha1_to_hex(old_sha1));
 185                return NULL; /* good */
 186        }
 187        else {
 188                lock = lock_any_ref_for_update(name, old_sha1);
 189                if (!lock) {
 190                        error("failed to lock %s", name);
 191                        return "failed to lock";
 192                }
 193                if (write_ref_sha1(lock, new_sha1, "push")) {
 194                        return "failed to write"; /* error() already called */
 195                }
 196                fprintf(stderr, "%s: %s -> %s\n", name,
 197                        sha1_to_hex(old_sha1), sha1_to_hex(new_sha1));
 198                return NULL; /* good */
 199        }
 200}
 201
 202static char update_post_hook[] = "hooks/post-update";
 203
 204static void run_update_post_hook(struct command *cmd)
 205{
 206        struct command *cmd_p;
 207        int argc;
 208        const char **argv;
 209
 210        for (argc = 0, cmd_p = cmd; cmd_p; cmd_p = cmd_p->next) {
 211                if (cmd_p->error_string)
 212                        continue;
 213                argc++;
 214        }
 215        if (!argc || access(update_post_hook, X_OK) < 0)
 216                return;
 217        argv = xmalloc(sizeof(*argv) * (2 + argc));
 218        argv[0] = update_post_hook;
 219
 220        for (argc = 1, cmd_p = cmd; cmd_p; cmd_p = cmd_p->next) {
 221                char *p;
 222                if (cmd_p->error_string)
 223                        continue;
 224                p = xmalloc(strlen(cmd_p->ref_name) + 1);
 225                strcpy(p, cmd_p->ref_name);
 226                argv[argc] = p;
 227                argc++;
 228        }
 229        argv[argc] = NULL;
 230        run_command_v_opt(argv, RUN_COMMAND_NO_STDIN
 231                | RUN_COMMAND_STDOUT_TO_STDERR);
 232}
 233
 234static void execute_commands(const char *unpacker_error)
 235{
 236        struct command *cmd = commands;
 237
 238        if (unpacker_error) {
 239                while (cmd) {
 240                        cmd->error_string = "n/a (unpacker error)";
 241                        cmd = cmd->next;
 242                }
 243                return;
 244        }
 245
 246        if (run_hook(pre_receive_hook, commands, 0)) {
 247                while (cmd) {
 248                        cmd->error_string = "pre-receive hook declined";
 249                        cmd = cmd->next;
 250                }
 251                return;
 252        }
 253
 254        while (cmd) {
 255                cmd->error_string = update(cmd);
 256                cmd = cmd->next;
 257        }
 258}
 259
 260static void read_head_info(void)
 261{
 262        struct command **p = &commands;
 263        for (;;) {
 264                static char line[1000];
 265                unsigned char old_sha1[20], new_sha1[20];
 266                struct command *cmd;
 267                char *refname;
 268                int len, reflen;
 269
 270                len = packet_read_line(0, line, sizeof(line));
 271                if (!len)
 272                        break;
 273                if (line[len-1] == '\n')
 274                        line[--len] = 0;
 275                if (len < 83 ||
 276                    line[40] != ' ' ||
 277                    line[81] != ' ' ||
 278                    get_sha1_hex(line, old_sha1) ||
 279                    get_sha1_hex(line + 41, new_sha1))
 280                        die("protocol error: expected old/new/ref, got '%s'",
 281                            line);
 282
 283                refname = line + 82;
 284                reflen = strlen(refname);
 285                if (reflen + 82 < len) {
 286                        if (strstr(refname + reflen + 1, "report-status"))
 287                                report_status = 1;
 288                }
 289                cmd = xmalloc(sizeof(struct command) + len - 80);
 290                hashcpy(cmd->old_sha1, old_sha1);
 291                hashcpy(cmd->new_sha1, new_sha1);
 292                memcpy(cmd->ref_name, line + 82, len - 81);
 293                cmd->error_string = NULL;
 294                cmd->next = NULL;
 295                *p = cmd;
 296                p = &cmd->next;
 297        }
 298}
 299
 300static const char *parse_pack_header(struct pack_header *hdr)
 301{
 302        switch (read_pack_header(0, hdr)) {
 303        case PH_ERROR_EOF:
 304                return "eof before pack header was fully read";
 305
 306        case PH_ERROR_PACK_SIGNATURE:
 307                return "protocol error (pack signature mismatch detected)";
 308
 309        case PH_ERROR_PROTOCOL:
 310                return "protocol error (pack version unsupported)";
 311
 312        default:
 313                return "unknown error in parse_pack_header";
 314
 315        case 0:
 316                return NULL;
 317        }
 318}
 319
 320static const char *pack_lockfile;
 321
 322static const char *unpack(void)
 323{
 324        struct pack_header hdr;
 325        const char *hdr_err;
 326        char hdr_arg[38];
 327
 328        hdr_err = parse_pack_header(&hdr);
 329        if (hdr_err)
 330                return hdr_err;
 331        snprintf(hdr_arg, sizeof(hdr_arg), "--pack_header=%u,%u",
 332                        ntohl(hdr.hdr_version), ntohl(hdr.hdr_entries));
 333
 334        if (ntohl(hdr.hdr_entries) < unpack_limit) {
 335                int code;
 336                const char *unpacker[3];
 337                unpacker[0] = "unpack-objects";
 338                unpacker[1] = hdr_arg;
 339                unpacker[2] = NULL;
 340                code = run_command_v_opt(unpacker, RUN_GIT_CMD);
 341                switch (code) {
 342                case 0:
 343                        return NULL;
 344                case -ERR_RUN_COMMAND_FORK:
 345                        return "unpack fork failed";
 346                case -ERR_RUN_COMMAND_EXEC:
 347                        return "unpack execute failed";
 348                case -ERR_RUN_COMMAND_WAITPID:
 349                        return "waitpid failed";
 350                case -ERR_RUN_COMMAND_WAITPID_WRONG_PID:
 351                        return "waitpid is confused";
 352                case -ERR_RUN_COMMAND_WAITPID_SIGNAL:
 353                        return "unpacker died of signal";
 354                case -ERR_RUN_COMMAND_WAITPID_NOEXIT:
 355                        return "unpacker died strangely";
 356                default:
 357                        return "unpacker exited with error code";
 358                }
 359        } else {
 360                const char *keeper[6];
 361                int fd[2], s, len, status;
 362                pid_t pid;
 363                char keep_arg[256];
 364                char packname[46];
 365
 366                s = sprintf(keep_arg, "--keep=receive-pack %i on ", getpid());
 367                if (gethostname(keep_arg + s, sizeof(keep_arg) - s))
 368                        strcpy(keep_arg + s, "localhost");
 369
 370                keeper[0] = "index-pack";
 371                keeper[1] = "--stdin";
 372                keeper[2] = "--fix-thin";
 373                keeper[3] = hdr_arg;
 374                keeper[4] = keep_arg;
 375                keeper[5] = NULL;
 376
 377                if (pipe(fd) < 0)
 378                        return "index-pack pipe failed";
 379                pid = fork();
 380                if (pid < 0)
 381                        return "index-pack fork failed";
 382                if (!pid) {
 383                        dup2(fd[1], 1);
 384                        close(fd[1]);
 385                        close(fd[0]);
 386                        execv_git_cmd(keeper);
 387                        die("execv of index-pack failed");
 388                }
 389                close(fd[1]);
 390
 391                /*
 392                 * The first thing we expects from index-pack's output
 393                 * is "pack\t%40s\n" or "keep\t%40s\n" (46 bytes) where
 394                 * %40s is the newly created pack SHA1 name.  In the "keep"
 395                 * case, we need it to remove the corresponding .keep file
 396                 * later on.  If we don't get that then tough luck with it.
 397                 */
 398                for (len = 0;
 399                     len < 46 && (s = xread(fd[0], packname+len, 46-len)) > 0;
 400                     len += s);
 401                close(fd[0]);
 402                if (len == 46 && packname[45] == '\n' &&
 403                    memcmp(packname, "keep\t", 5) == 0) {
 404                        char path[PATH_MAX];
 405                        packname[45] = 0;
 406                        snprintf(path, sizeof(path), "%s/pack/pack-%s.keep",
 407                                 get_object_directory(), packname + 5);
 408                        pack_lockfile = xstrdup(path);
 409                }
 410
 411                /* Then wrap our index-pack process. */
 412                while (waitpid(pid, &status, 0) < 0)
 413                        if (errno != EINTR)
 414                                return "waitpid failed";
 415                if (WIFEXITED(status)) {
 416                        int code = WEXITSTATUS(status);
 417                        if (code)
 418                                return "index-pack exited with error code";
 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, commands, 0);
 502                run_update_post_hook(commands);
 503        }
 504        return 0;
 505}