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