git.con commit Sync with 1.8.0.3 (1b800f8)
   1#include "builtin.h"
   2#include "cache.h"
   3#include "exec_cmd.h"
   4#include "help.h"
   5#include "quote.h"
   6#include "run-command.h"
   7
   8const char git_usage_string[] =
   9        "git [--version] [--exec-path[=<path>]] [--html-path] [--man-path] [--info-path]\n"
  10        "           [-p|--paginate|--no-pager] [--no-replace-objects] [--bare]\n"
  11        "           [--git-dir=<path>] [--work-tree=<path>] [--namespace=<name>]\n"
  12        "           [-c name=value] [--help]\n"
  13        "           <command> [<args>]";
  14
  15const char git_more_info_string[] =
  16        N_("See 'git help <command>' for more information on a specific command.");
  17
  18static struct startup_info git_startup_info;
  19static int use_pager = -1;
  20
  21static void commit_pager_choice(void) {
  22        switch (use_pager) {
  23        case 0:
  24                setenv("GIT_PAGER", "cat", 1);
  25                break;
  26        case 1:
  27                setup_pager();
  28                break;
  29        default:
  30                break;
  31        }
  32}
  33
  34static int handle_options(const char ***argv, int *argc, int *envchanged)
  35{
  36        const char **orig_argv = *argv;
  37
  38        while (*argc > 0) {
  39                const char *cmd = (*argv)[0];
  40                if (cmd[0] != '-')
  41                        break;
  42
  43                /*
  44                 * For legacy reasons, the "version" and "help"
  45                 * commands can be written with "--" prepended
  46                 * to make them look like flags.
  47                 */
  48                if (!strcmp(cmd, "--help") || !strcmp(cmd, "--version"))
  49                        break;
  50
  51                /*
  52                 * Check remaining flags.
  53                 */
  54                if (!prefixcmp(cmd, "--exec-path")) {
  55                        cmd += 11;
  56                        if (*cmd == '=')
  57                                git_set_argv_exec_path(cmd + 1);
  58                        else {
  59                                puts(git_exec_path());
  60                                exit(0);
  61                        }
  62                } else if (!strcmp(cmd, "--html-path")) {
  63                        puts(system_path(GIT_HTML_PATH));
  64                        exit(0);
  65                } else if (!strcmp(cmd, "--man-path")) {
  66                        puts(system_path(GIT_MAN_PATH));
  67                        exit(0);
  68                } else if (!strcmp(cmd, "--info-path")) {
  69                        puts(system_path(GIT_INFO_PATH));
  70                        exit(0);
  71                } else if (!strcmp(cmd, "-p") || !strcmp(cmd, "--paginate")) {
  72                        use_pager = 1;
  73                } else if (!strcmp(cmd, "--no-pager")) {
  74                        use_pager = 0;
  75                        if (envchanged)
  76                                *envchanged = 1;
  77                } else if (!strcmp(cmd, "--no-replace-objects")) {
  78                        read_replace_refs = 0;
  79                        setenv(NO_REPLACE_OBJECTS_ENVIRONMENT, "1", 1);
  80                        if (envchanged)
  81                                *envchanged = 1;
  82                } else if (!strcmp(cmd, "--git-dir")) {
  83                        if (*argc < 2) {
  84                                fprintf(stderr, "No directory given for --git-dir.\n" );
  85                                usage(git_usage_string);
  86                        }
  87                        setenv(GIT_DIR_ENVIRONMENT, (*argv)[1], 1);
  88                        if (envchanged)
  89                                *envchanged = 1;
  90                        (*argv)++;
  91                        (*argc)--;
  92                } else if (!prefixcmp(cmd, "--git-dir=")) {
  93                        setenv(GIT_DIR_ENVIRONMENT, cmd + 10, 1);
  94                        if (envchanged)
  95                                *envchanged = 1;
  96                } else if (!strcmp(cmd, "--namespace")) {
  97                        if (*argc < 2) {
  98                                fprintf(stderr, "No namespace given for --namespace.\n" );
  99                                usage(git_usage_string);
 100                        }
 101                        setenv(GIT_NAMESPACE_ENVIRONMENT, (*argv)[1], 1);
 102                        if (envchanged)
 103                                *envchanged = 1;
 104                        (*argv)++;
 105                        (*argc)--;
 106                } else if (!prefixcmp(cmd, "--namespace=")) {
 107                        setenv(GIT_NAMESPACE_ENVIRONMENT, cmd + 12, 1);
 108                        if (envchanged)
 109                                *envchanged = 1;
 110                } else if (!strcmp(cmd, "--work-tree")) {
 111                        if (*argc < 2) {
 112                                fprintf(stderr, "No directory given for --work-tree.\n" );
 113                                usage(git_usage_string);
 114                        }
 115                        setenv(GIT_WORK_TREE_ENVIRONMENT, (*argv)[1], 1);
 116                        if (envchanged)
 117                                *envchanged = 1;
 118                        (*argv)++;
 119                        (*argc)--;
 120                } else if (!prefixcmp(cmd, "--work-tree=")) {
 121                        setenv(GIT_WORK_TREE_ENVIRONMENT, cmd + 12, 1);
 122                        if (envchanged)
 123                                *envchanged = 1;
 124                } else if (!strcmp(cmd, "--bare")) {
 125                        static char git_dir[PATH_MAX+1];
 126                        is_bare_repository_cfg = 1;
 127                        setenv(GIT_DIR_ENVIRONMENT, getcwd(git_dir, sizeof(git_dir)), 0);
 128                        if (envchanged)
 129                                *envchanged = 1;
 130                } else if (!strcmp(cmd, "-c")) {
 131                        if (*argc < 2) {
 132                                fprintf(stderr, "-c expects a configuration string\n" );
 133                                usage(git_usage_string);
 134                        }
 135                        git_config_push_parameter((*argv)[1]);
 136                        (*argv)++;
 137                        (*argc)--;
 138                } else {
 139                        fprintf(stderr, "Unknown option: %s\n", cmd);
 140                        usage(git_usage_string);
 141                }
 142
 143                (*argv)++;
 144                (*argc)--;
 145        }
 146        return (*argv) - orig_argv;
 147}
 148
 149static int handle_alias(int *argcp, const char ***argv)
 150{
 151        int envchanged = 0, ret = 0, saved_errno = errno;
 152        const char *subdir;
 153        int count, option_count;
 154        const char **new_argv;
 155        const char *alias_command;
 156        char *alias_string;
 157        int unused_nongit;
 158
 159        subdir = setup_git_directory_gently(&unused_nongit);
 160
 161        alias_command = (*argv)[0];
 162        alias_string = alias_lookup(alias_command);
 163        if (alias_string) {
 164                if (alias_string[0] == '!') {
 165                        const char **alias_argv;
 166                        int argc = *argcp, i;
 167
 168                        commit_pager_choice();
 169
 170                        /* build alias_argv */
 171                        alias_argv = xmalloc(sizeof(*alias_argv) * (argc + 1));
 172                        alias_argv[0] = alias_string + 1;
 173                        for (i = 1; i < argc; ++i)
 174                                alias_argv[i] = (*argv)[i];
 175                        alias_argv[argc] = NULL;
 176
 177                        ret = run_command_v_opt(alias_argv, RUN_USING_SHELL);
 178                        if (ret >= 0)   /* normal exit */
 179                                exit(ret);
 180
 181                        die_errno("While expanding alias '%s': '%s'",
 182                            alias_command, alias_string + 1);
 183                }
 184                count = split_cmdline(alias_string, &new_argv);
 185                if (count < 0)
 186                        die("Bad alias.%s string: %s", alias_command,
 187                            split_cmdline_strerror(count));
 188                option_count = handle_options(&new_argv, &count, &envchanged);
 189                if (envchanged)
 190                        die("alias '%s' changes environment variables\n"
 191                                 "You can use '!git' in the alias to do this.",
 192                                 alias_command);
 193                memmove(new_argv - option_count, new_argv,
 194                                count * sizeof(char *));
 195                new_argv -= option_count;
 196
 197                if (count < 1)
 198                        die("empty alias for %s", alias_command);
 199
 200                if (!strcmp(alias_command, new_argv[0]))
 201                        die("recursive alias: %s", alias_command);
 202
 203                trace_argv_printf(new_argv,
 204                                  "trace: alias expansion: %s =>",
 205                                  alias_command);
 206
 207                new_argv = xrealloc(new_argv, sizeof(char *) *
 208                                    (count + *argcp));
 209                /* insert after command name */
 210                memcpy(new_argv + count, *argv + 1, sizeof(char *) * *argcp);
 211
 212                *argv = new_argv;
 213                *argcp += count - 1;
 214
 215                ret = 1;
 216        }
 217
 218        if (subdir && chdir(subdir))
 219                die_errno("Cannot change to '%s'", subdir);
 220
 221        errno = saved_errno;
 222
 223        return ret;
 224}
 225
 226#define RUN_SETUP               (1<<0)
 227#define RUN_SETUP_GENTLY        (1<<1)
 228#define USE_PAGER               (1<<2)
 229/*
 230 * require working tree to be present -- anything uses this needs
 231 * RUN_SETUP for reading from the configuration file.
 232 */
 233#define NEED_WORK_TREE          (1<<3)
 234
 235struct cmd_struct {
 236        const char *cmd;
 237        int (*fn)(int, const char **, const char *);
 238        int option;
 239};
 240
 241static int run_builtin(struct cmd_struct *p, int argc, const char **argv)
 242{
 243        int status, help;
 244        struct stat st;
 245        const char *prefix;
 246
 247        prefix = NULL;
 248        help = argc == 2 && !strcmp(argv[1], "-h");
 249        if (!help) {
 250                if (p->option & RUN_SETUP)
 251                        prefix = setup_git_directory();
 252                if (p->option & RUN_SETUP_GENTLY) {
 253                        int nongit_ok;
 254                        prefix = setup_git_directory_gently(&nongit_ok);
 255                }
 256
 257                if (use_pager == -1 && p->option & (RUN_SETUP | RUN_SETUP_GENTLY))
 258                        use_pager = check_pager_config(p->cmd);
 259                if (use_pager == -1 && p->option & USE_PAGER)
 260                        use_pager = 1;
 261
 262                if ((p->option & (RUN_SETUP | RUN_SETUP_GENTLY)) &&
 263                    startup_info->have_repository) /* get_git_dir() may set up repo, avoid that */
 264                        trace_repo_setup(prefix);
 265        }
 266        commit_pager_choice();
 267
 268        if (!help && p->option & NEED_WORK_TREE)
 269                setup_work_tree();
 270
 271        trace_argv_printf(argv, "trace: built-in: git");
 272
 273        status = p->fn(argc, argv, prefix);
 274        if (status)
 275                return status;
 276
 277        /* Somebody closed stdout? */
 278        if (fstat(fileno(stdout), &st))
 279                return 0;
 280        /* Ignore write errors for pipes and sockets.. */
 281        if (S_ISFIFO(st.st_mode) || S_ISSOCK(st.st_mode))
 282                return 0;
 283
 284        /* Check for ENOSPC and EIO errors.. */
 285        if (fflush(stdout))
 286                die_errno("write failure on standard output");
 287        if (ferror(stdout))
 288                die("unknown write failure on standard output");
 289        if (fclose(stdout))
 290                die_errno("close failed on standard output");
 291        return 0;
 292}
 293
 294static void handle_internal_command(int argc, const char **argv)
 295{
 296        const char *cmd = argv[0];
 297        static struct cmd_struct commands[] = {
 298                { "add", cmd_add, RUN_SETUP | NEED_WORK_TREE },
 299                { "annotate", cmd_annotate, RUN_SETUP },
 300                { "apply", cmd_apply, RUN_SETUP_GENTLY },
 301                { "archive", cmd_archive },
 302                { "bisect--helper", cmd_bisect__helper, RUN_SETUP },
 303                { "blame", cmd_blame, RUN_SETUP },
 304                { "branch", cmd_branch, RUN_SETUP },
 305                { "bundle", cmd_bundle, RUN_SETUP_GENTLY },
 306                { "cat-file", cmd_cat_file, RUN_SETUP },
 307                { "check-attr", cmd_check_attr, RUN_SETUP },
 308                { "check-ref-format", cmd_check_ref_format },
 309                { "checkout", cmd_checkout, RUN_SETUP | NEED_WORK_TREE },
 310                { "checkout-index", cmd_checkout_index,
 311                        RUN_SETUP | NEED_WORK_TREE},
 312                { "cherry", cmd_cherry, RUN_SETUP },
 313                { "cherry-pick", cmd_cherry_pick, RUN_SETUP | NEED_WORK_TREE },
 314                { "clean", cmd_clean, RUN_SETUP | NEED_WORK_TREE },
 315                { "clone", cmd_clone },
 316                { "column", cmd_column, RUN_SETUP_GENTLY },
 317                { "commit", cmd_commit, RUN_SETUP | NEED_WORK_TREE },
 318                { "commit-tree", cmd_commit_tree, RUN_SETUP },
 319                { "config", cmd_config, RUN_SETUP_GENTLY },
 320                { "count-objects", cmd_count_objects, RUN_SETUP },
 321                { "credential", cmd_credential, RUN_SETUP_GENTLY },
 322                { "describe", cmd_describe, RUN_SETUP },
 323                { "diff", cmd_diff },
 324                { "diff-files", cmd_diff_files, RUN_SETUP | NEED_WORK_TREE },
 325                { "diff-index", cmd_diff_index, RUN_SETUP },
 326                { "diff-tree", cmd_diff_tree, RUN_SETUP },
 327                { "fast-export", cmd_fast_export, RUN_SETUP },
 328                { "fetch", cmd_fetch, RUN_SETUP },
 329                { "fetch-pack", cmd_fetch_pack, RUN_SETUP },
 330                { "fmt-merge-msg", cmd_fmt_merge_msg, RUN_SETUP },
 331                { "for-each-ref", cmd_for_each_ref, RUN_SETUP },
 332                { "format-patch", cmd_format_patch, RUN_SETUP },
 333                { "fsck", cmd_fsck, RUN_SETUP },
 334                { "fsck-objects", cmd_fsck, RUN_SETUP },
 335                { "gc", cmd_gc, RUN_SETUP },
 336                { "get-tar-commit-id", cmd_get_tar_commit_id },
 337                { "grep", cmd_grep, RUN_SETUP_GENTLY },
 338                { "hash-object", cmd_hash_object },
 339                { "help", cmd_help },
 340                { "index-pack", cmd_index_pack, RUN_SETUP_GENTLY },
 341                { "init", cmd_init_db },
 342                { "init-db", cmd_init_db },
 343                { "log", cmd_log, RUN_SETUP },
 344                { "ls-files", cmd_ls_files, RUN_SETUP },
 345                { "ls-remote", cmd_ls_remote, RUN_SETUP_GENTLY },
 346                { "ls-tree", cmd_ls_tree, RUN_SETUP },
 347                { "mailinfo", cmd_mailinfo },
 348                { "mailsplit", cmd_mailsplit },
 349                { "merge", cmd_merge, RUN_SETUP | NEED_WORK_TREE },
 350                { "merge-base", cmd_merge_base, RUN_SETUP },
 351                { "merge-file", cmd_merge_file, RUN_SETUP_GENTLY },
 352                { "merge-index", cmd_merge_index, RUN_SETUP },
 353                { "merge-ours", cmd_merge_ours, RUN_SETUP },
 354                { "merge-recursive", cmd_merge_recursive, RUN_SETUP | NEED_WORK_TREE },
 355                { "merge-recursive-ours", cmd_merge_recursive, RUN_SETUP | NEED_WORK_TREE },
 356                { "merge-recursive-theirs", cmd_merge_recursive, RUN_SETUP | NEED_WORK_TREE },
 357                { "merge-subtree", cmd_merge_recursive, RUN_SETUP | NEED_WORK_TREE },
 358                { "merge-tree", cmd_merge_tree, RUN_SETUP },
 359                { "mktag", cmd_mktag, RUN_SETUP },
 360                { "mktree", cmd_mktree, RUN_SETUP },
 361                { "mv", cmd_mv, RUN_SETUP | NEED_WORK_TREE },
 362                { "name-rev", cmd_name_rev, RUN_SETUP },
 363                { "notes", cmd_notes, RUN_SETUP },
 364                { "pack-objects", cmd_pack_objects, RUN_SETUP },
 365                { "pack-redundant", cmd_pack_redundant, RUN_SETUP },
 366                { "pack-refs", cmd_pack_refs, RUN_SETUP },
 367                { "patch-id", cmd_patch_id },
 368                { "peek-remote", cmd_ls_remote, RUN_SETUP_GENTLY },
 369                { "pickaxe", cmd_blame, RUN_SETUP },
 370                { "prune", cmd_prune, RUN_SETUP },
 371                { "prune-packed", cmd_prune_packed, RUN_SETUP },
 372                { "push", cmd_push, RUN_SETUP },
 373                { "read-tree", cmd_read_tree, RUN_SETUP },
 374                { "receive-pack", cmd_receive_pack },
 375                { "reflog", cmd_reflog, RUN_SETUP },
 376                { "remote", cmd_remote, RUN_SETUP },
 377                { "remote-ext", cmd_remote_ext },
 378                { "remote-fd", cmd_remote_fd },
 379                { "replace", cmd_replace, RUN_SETUP },
 380                { "repo-config", cmd_repo_config, RUN_SETUP_GENTLY },
 381                { "rerere", cmd_rerere, RUN_SETUP },
 382                { "reset", cmd_reset, RUN_SETUP },
 383                { "rev-list", cmd_rev_list, RUN_SETUP },
 384                { "rev-parse", cmd_rev_parse },
 385                { "revert", cmd_revert, RUN_SETUP | NEED_WORK_TREE },
 386                { "rm", cmd_rm, RUN_SETUP },
 387                { "send-pack", cmd_send_pack, RUN_SETUP },
 388                { "shortlog", cmd_shortlog, RUN_SETUP_GENTLY | USE_PAGER },
 389                { "show", cmd_show, RUN_SETUP },
 390                { "show-branch", cmd_show_branch, RUN_SETUP },
 391                { "show-ref", cmd_show_ref, RUN_SETUP },
 392                { "stage", cmd_add, RUN_SETUP | NEED_WORK_TREE },
 393                { "status", cmd_status, RUN_SETUP | NEED_WORK_TREE },
 394                { "stripspace", cmd_stripspace },
 395                { "symbolic-ref", cmd_symbolic_ref, RUN_SETUP },
 396                { "tag", cmd_tag, RUN_SETUP },
 397                { "tar-tree", cmd_tar_tree },
 398                { "unpack-file", cmd_unpack_file, RUN_SETUP },
 399                { "unpack-objects", cmd_unpack_objects, RUN_SETUP },
 400                { "update-index", cmd_update_index, RUN_SETUP },
 401                { "update-ref", cmd_update_ref, RUN_SETUP },
 402                { "update-server-info", cmd_update_server_info, RUN_SETUP },
 403                { "upload-archive", cmd_upload_archive },
 404                { "upload-archive--writer", cmd_upload_archive_writer },
 405                { "var", cmd_var, RUN_SETUP_GENTLY },
 406                { "verify-pack", cmd_verify_pack },
 407                { "verify-tag", cmd_verify_tag, RUN_SETUP },
 408                { "version", cmd_version },
 409                { "whatchanged", cmd_whatchanged, RUN_SETUP },
 410                { "write-tree", cmd_write_tree, RUN_SETUP },
 411        };
 412        int i;
 413        static const char ext[] = STRIP_EXTENSION;
 414
 415        if (sizeof(ext) > 1) {
 416                i = strlen(argv[0]) - strlen(ext);
 417                if (i > 0 && !strcmp(argv[0] + i, ext)) {
 418                        char *argv0 = xstrdup(argv[0]);
 419                        argv[0] = cmd = argv0;
 420                        argv0[i] = '\0';
 421                }
 422        }
 423
 424        /* Turn "git cmd --help" into "git help cmd" */
 425        if (argc > 1 && !strcmp(argv[1], "--help")) {
 426                argv[1] = argv[0];
 427                argv[0] = cmd = "help";
 428        }
 429
 430        for (i = 0; i < ARRAY_SIZE(commands); i++) {
 431                struct cmd_struct *p = commands+i;
 432                if (strcmp(p->cmd, cmd))
 433                        continue;
 434                exit(run_builtin(p, argc, argv));
 435        }
 436}
 437
 438static void execv_dashed_external(const char **argv)
 439{
 440        struct strbuf cmd = STRBUF_INIT;
 441        const char *tmp;
 442        int status;
 443
 444        if (use_pager == -1)
 445                use_pager = check_pager_config(argv[0]);
 446        commit_pager_choice();
 447
 448        strbuf_addf(&cmd, "git-%s", argv[0]);
 449
 450        /*
 451         * argv[0] must be the git command, but the argv array
 452         * belongs to the caller, and may be reused in
 453         * subsequent loop iterations. Save argv[0] and
 454         * restore it on error.
 455         */
 456        tmp = argv[0];
 457        argv[0] = cmd.buf;
 458
 459        trace_argv_printf(argv, "trace: exec:");
 460
 461        /*
 462         * if we fail because the command is not found, it is
 463         * OK to return. Otherwise, we just pass along the status code.
 464         */
 465        status = run_command_v_opt(argv, RUN_SILENT_EXEC_FAILURE | RUN_CLEAN_ON_EXIT);
 466        if (status >= 0 || errno != ENOENT)
 467                exit(status);
 468
 469        argv[0] = tmp;
 470
 471        strbuf_release(&cmd);
 472}
 473
 474static int run_argv(int *argcp, const char ***argv)
 475{
 476        int done_alias = 0;
 477
 478        while (1) {
 479                /* See if it's an internal command */
 480                handle_internal_command(*argcp, *argv);
 481
 482                /* .. then try the external ones */
 483                execv_dashed_external(*argv);
 484
 485                /* It could be an alias -- this works around the insanity
 486                 * of overriding "git log" with "git show" by having
 487                 * alias.log = show
 488                 */
 489                if (done_alias || !handle_alias(argcp, argv))
 490                        break;
 491                done_alias = 1;
 492        }
 493
 494        return done_alias;
 495}
 496
 497
 498int main(int argc, const char **argv)
 499{
 500        const char *cmd;
 501
 502        startup_info = &git_startup_info;
 503
 504        cmd = git_extract_argv0_path(argv[0]);
 505        if (!cmd)
 506                cmd = "git-help";
 507
 508        git_setup_gettext();
 509
 510        /*
 511         * "git-xxxx" is the same as "git xxxx", but we obviously:
 512         *
 513         *  - cannot take flags in between the "git" and the "xxxx".
 514         *  - cannot execute it externally (since it would just do
 515         *    the same thing over again)
 516         *
 517         * So we just directly call the internal command handler, and
 518         * die if that one cannot handle it.
 519         */
 520        if (!prefixcmp(cmd, "git-")) {
 521                cmd += 4;
 522                argv[0] = cmd;
 523                handle_internal_command(argc, argv);
 524                die("cannot handle %s internally", cmd);
 525        }
 526
 527        /* Look for flags.. */
 528        argv++;
 529        argc--;
 530        handle_options(&argv, &argc, NULL);
 531        if (argc > 0) {
 532                if (!prefixcmp(argv[0], "--"))
 533                        argv[0] += 2;
 534        } else {
 535                /* The user didn't specify a command; give them help */
 536                commit_pager_choice();
 537                printf("usage: %s\n\n", git_usage_string);
 538                list_common_cmds_help();
 539                printf("\n%s\n", git_more_info_string);
 540                exit(1);
 541        }
 542        cmd = argv[0];
 543
 544        /*
 545         * We use PATH to find git commands, but we prepend some higher
 546         * precedence paths: the "--exec-path" option, the GIT_EXEC_PATH
 547         * environment, and the $(gitexecdir) from the Makefile at build
 548         * time.
 549         */
 550        setup_path();
 551
 552        while (1) {
 553                static int done_help = 0;
 554                static int was_alias = 0;
 555                was_alias = run_argv(&argc, &argv);
 556                if (errno != ENOENT)
 557                        break;
 558                if (was_alias) {
 559                        fprintf(stderr, "Expansion of alias '%s' failed; "
 560                                "'%s' is not a git command\n",
 561                                cmd, argv[0]);
 562                        exit(1);
 563                }
 564                if (!done_help) {
 565                        cmd = argv[0] = help_unknown_cmd(cmd);
 566                        done_help = 1;
 567                } else
 568                        break;
 569        }
 570
 571        fprintf(stderr, "Failed to run command '%s': %s\n",
 572                cmd, strerror(errno));
 573
 574        return 1;
 575}