git.con commit Merge branch 'nd/maint-relative' into maint (0bc6180)
   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]\n"
  10        "           [-p|--paginate|--no-pager] [--no-replace-objects]\n"
  11        "           [--bare] [--git-dir=<path>] [--work-tree=<path>]\n"
  12        "           [-c name=value] [--help]\n"
  13        "           <command> [<args>]";
  14
  15const char git_more_info_string[] =
  16        "See 'git help <command>' for more information on a specific command.";
  17
  18static struct startup_info git_startup_info;
  19static int use_pager = -1;
  20struct pager_config {
  21        const char *cmd;
  22        int val;
  23};
  24
  25static int pager_command_config(const char *var, const char *value, void *data)
  26{
  27        struct pager_config *c = data;
  28        if (!prefixcmp(var, "pager.") && !strcmp(var + 6, c->cmd))
  29                c->val = git_config_bool(var, value);
  30        return 0;
  31}
  32
  33/* returns 0 for "no pager", 1 for "use pager", and -1 for "not specified" */
  34int check_pager_config(const char *cmd)
  35{
  36        struct pager_config c;
  37        c.cmd = cmd;
  38        c.val = -1;
  39        git_config(pager_command_config, &c);
  40        return c.val;
  41}
  42
  43static void commit_pager_choice(void) {
  44        switch (use_pager) {
  45        case 0:
  46                setenv("GIT_PAGER", "cat", 1);
  47                break;
  48        case 1:
  49                setup_pager();
  50                break;
  51        default:
  52                break;
  53        }
  54}
  55
  56static int handle_options(const char ***argv, int *argc, int *envchanged)
  57{
  58        int handled = 0;
  59
  60        while (*argc > 0) {
  61                const char *cmd = (*argv)[0];
  62                if (cmd[0] != '-')
  63                        break;
  64
  65                /*
  66                 * For legacy reasons, the "version" and "help"
  67                 * commands can be written with "--" prepended
  68                 * to make them look like flags.
  69                 */
  70                if (!strcmp(cmd, "--help") || !strcmp(cmd, "--version"))
  71                        break;
  72
  73                /*
  74                 * Check remaining flags.
  75                 */
  76                if (!prefixcmp(cmd, "--exec-path")) {
  77                        cmd += 11;
  78                        if (*cmd == '=')
  79                                git_set_argv_exec_path(cmd + 1);
  80                        else {
  81                                puts(git_exec_path());
  82                                exit(0);
  83                        }
  84                } else if (!strcmp(cmd, "--html-path")) {
  85                        puts(system_path(GIT_HTML_PATH));
  86                        exit(0);
  87                } else if (!strcmp(cmd, "-p") || !strcmp(cmd, "--paginate")) {
  88                        use_pager = 1;
  89                } else if (!strcmp(cmd, "--no-pager")) {
  90                        use_pager = 0;
  91                        if (envchanged)
  92                                *envchanged = 1;
  93                } else if (!strcmp(cmd, "--no-replace-objects")) {
  94                        read_replace_refs = 0;
  95                        setenv(NO_REPLACE_OBJECTS_ENVIRONMENT, "1", 1);
  96                        if (envchanged)
  97                                *envchanged = 1;
  98                } else if (!strcmp(cmd, "--git-dir")) {
  99                        if (*argc < 2) {
 100                                fprintf(stderr, "No directory given for --git-dir.\n" );
 101                                usage(git_usage_string);
 102                        }
 103                        setenv(GIT_DIR_ENVIRONMENT, (*argv)[1], 1);
 104                        if (envchanged)
 105                                *envchanged = 1;
 106                        (*argv)++;
 107                        (*argc)--;
 108                        handled++;
 109                } else if (!prefixcmp(cmd, "--git-dir=")) {
 110                        setenv(GIT_DIR_ENVIRONMENT, cmd + 10, 1);
 111                        if (envchanged)
 112                                *envchanged = 1;
 113                } else if (!strcmp(cmd, "--work-tree")) {
 114                        if (*argc < 2) {
 115                                fprintf(stderr, "No directory given for --work-tree.\n" );
 116                                usage(git_usage_string);
 117                        }
 118                        setenv(GIT_WORK_TREE_ENVIRONMENT, (*argv)[1], 1);
 119                        if (envchanged)
 120                                *envchanged = 1;
 121                        (*argv)++;
 122                        (*argc)--;
 123                } else if (!prefixcmp(cmd, "--work-tree=")) {
 124                        setenv(GIT_WORK_TREE_ENVIRONMENT, cmd + 12, 1);
 125                        if (envchanged)
 126                                *envchanged = 1;
 127                } else if (!strcmp(cmd, "--bare")) {
 128                        static char git_dir[PATH_MAX+1];
 129                        is_bare_repository_cfg = 1;
 130                        setenv(GIT_DIR_ENVIRONMENT, getcwd(git_dir, sizeof(git_dir)), 0);
 131                        if (envchanged)
 132                                *envchanged = 1;
 133                } else if (!strcmp(cmd, "-c")) {
 134                        if (*argc < 2) {
 135                                fprintf(stderr, "-c expects a configuration string\n" );
 136                                usage(git_usage_string);
 137                        }
 138                        git_config_push_parameter((*argv)[1]);
 139                        (*argv)++;
 140                        (*argc)--;
 141                } else {
 142                        fprintf(stderr, "Unknown option: %s\n", cmd);
 143                        usage(git_usage_string);
 144                }
 145
 146                (*argv)++;
 147                (*argc)--;
 148                handled++;
 149        }
 150        return handled;
 151}
 152
 153static int handle_alias(int *argcp, const char ***argv)
 154{
 155        int envchanged = 0, ret = 0, saved_errno = errno;
 156        const char *subdir;
 157        int count, option_count;
 158        const char **new_argv;
 159        const char *alias_command;
 160        char *alias_string;
 161        int unused_nongit;
 162
 163        subdir = setup_git_directory_gently(&unused_nongit);
 164
 165        alias_command = (*argv)[0];
 166        alias_string = alias_lookup(alias_command);
 167        if (alias_string) {
 168                if (alias_string[0] == '!') {
 169                        commit_pager_choice();
 170                        if (*argcp > 1) {
 171                                struct strbuf buf;
 172
 173                                strbuf_init(&buf, PATH_MAX);
 174                                strbuf_addstr(&buf, alias_string);
 175                                sq_quote_argv(&buf, (*argv) + 1, PATH_MAX);
 176                                free(alias_string);
 177                                alias_string = buf.buf;
 178                        }
 179                        trace_printf("trace: alias to shell cmd: %s => %s\n",
 180                                     alias_command, alias_string + 1);
 181                        ret = system(alias_string + 1);
 182                        if (ret >= 0 && WIFEXITED(ret) &&
 183                            WEXITSTATUS(ret) != 127)
 184                                exit(WEXITSTATUS(ret));
 185                        die("Failed to run '%s' when expanding alias '%s'",
 186                            alias_string + 1, alias_command);
 187                }
 188                count = split_cmdline(alias_string, &new_argv);
 189                if (count < 0)
 190                        die("Bad alias.%s string: %s", alias_command,
 191                            split_cmdline_strerror(count));
 192                option_count = handle_options(&new_argv, &count, &envchanged);
 193                if (envchanged)
 194                        die("alias '%s' changes environment variables\n"
 195                                 "You can use '!git' in the alias to do this.",
 196                                 alias_command);
 197                memmove(new_argv - option_count, new_argv,
 198                                count * sizeof(char *));
 199                new_argv -= option_count;
 200
 201                if (count < 1)
 202                        die("empty alias for %s", alias_command);
 203
 204                if (!strcmp(alias_command, new_argv[0]))
 205                        die("recursive alias: %s", alias_command);
 206
 207                trace_argv_printf(new_argv,
 208                                  "trace: alias expansion: %s =>",
 209                                  alias_command);
 210
 211                new_argv = xrealloc(new_argv, sizeof(char *) *
 212                                    (count + *argcp));
 213                /* insert after command name */
 214                memcpy(new_argv + count, *argv + 1, sizeof(char *) * *argcp);
 215
 216                *argv = new_argv;
 217                *argcp += count - 1;
 218
 219                ret = 1;
 220        }
 221
 222        if (subdir && chdir(subdir))
 223                die_errno("Cannot change to '%s'", subdir);
 224
 225        errno = saved_errno;
 226
 227        return ret;
 228}
 229
 230const char git_version_string[] = GIT_VERSION;
 231
 232#define RUN_SETUP               (1<<0)
 233#define RUN_SETUP_GENTLY        (1<<1)
 234#define USE_PAGER               (1<<2)
 235/*
 236 * require working tree to be present -- anything uses this needs
 237 * RUN_SETUP for reading from the configuration file.
 238 */
 239#define NEED_WORK_TREE          (1<<3)
 240
 241struct cmd_struct {
 242        const char *cmd;
 243        int (*fn)(int, const char **, const char *);
 244        int option;
 245};
 246
 247static int run_builtin(struct cmd_struct *p, int argc, const char **argv)
 248{
 249        int status, help;
 250        struct stat st;
 251        const char *prefix;
 252
 253        prefix = NULL;
 254        help = argc == 2 && !strcmp(argv[1], "-h");
 255        if (!help) {
 256                if (p->option & RUN_SETUP)
 257                        prefix = setup_git_directory();
 258                if (p->option & RUN_SETUP_GENTLY) {
 259                        int nongit_ok;
 260                        prefix = setup_git_directory_gently(&nongit_ok);
 261                }
 262
 263                if (use_pager == -1 && p->option & (RUN_SETUP | RUN_SETUP_GENTLY))
 264                        use_pager = check_pager_config(p->cmd);
 265                if (use_pager == -1 && p->option & USE_PAGER)
 266                        use_pager = 1;
 267        }
 268        commit_pager_choice();
 269
 270        if (!help && p->option & NEED_WORK_TREE)
 271                setup_work_tree();
 272
 273        trace_argv_printf(argv, "trace: built-in: git");
 274
 275        status = p->fn(argc, argv, prefix);
 276        if (status)
 277                return status;
 278
 279        /* Somebody closed stdout? */
 280        if (fstat(fileno(stdout), &st))
 281                return 0;
 282        /* Ignore write errors for pipes and sockets.. */
 283        if (S_ISFIFO(st.st_mode) || S_ISSOCK(st.st_mode))
 284                return 0;
 285
 286        /* Check for ENOSPC and EIO errors.. */
 287        if (fflush(stdout))
 288                die_errno("write failure on standard output");
 289        if (ferror(stdout))
 290                die("unknown write failure on standard output");
 291        if (fclose(stdout))
 292                die_errno("close failed on standard output");
 293        return 0;
 294}
 295
 296static void handle_internal_command(int argc, const char **argv)
 297{
 298        const char *cmd = argv[0];
 299        static struct cmd_struct commands[] = {
 300                { "add", cmd_add, RUN_SETUP | NEED_WORK_TREE },
 301                { "stage", cmd_add, RUN_SETUP | NEED_WORK_TREE },
 302                { "annotate", cmd_annotate, RUN_SETUP },
 303                { "apply", cmd_apply, RUN_SETUP_GENTLY },
 304                { "archive", cmd_archive },
 305                { "bisect--helper", cmd_bisect__helper, RUN_SETUP | NEED_WORK_TREE },
 306                { "blame", cmd_blame, RUN_SETUP },
 307                { "branch", cmd_branch, RUN_SETUP },
 308                { "bundle", cmd_bundle, RUN_SETUP_GENTLY },
 309                { "cat-file", cmd_cat_file, RUN_SETUP },
 310                { "checkout", cmd_checkout, RUN_SETUP | NEED_WORK_TREE },
 311                { "checkout-index", cmd_checkout_index,
 312                        RUN_SETUP | NEED_WORK_TREE},
 313                { "check-ref-format", cmd_check_ref_format },
 314                { "check-attr", cmd_check_attr, RUN_SETUP },
 315                { "cherry", cmd_cherry, RUN_SETUP },
 316                { "cherry-pick", cmd_cherry_pick, RUN_SETUP | NEED_WORK_TREE },
 317                { "clone", cmd_clone },
 318                { "clean", cmd_clean, RUN_SETUP | NEED_WORK_TREE },
 319                { "commit", cmd_commit, RUN_SETUP | NEED_WORK_TREE },
 320                { "commit-tree", cmd_commit_tree, RUN_SETUP },
 321                { "config", cmd_config, RUN_SETUP_GENTLY },
 322                { "count-objects", cmd_count_objects, RUN_SETUP },
 323                { "describe", cmd_describe, RUN_SETUP },
 324                { "diff", cmd_diff },
 325                { "diff-files", cmd_diff_files, RUN_SETUP | NEED_WORK_TREE },
 326                { "diff-index", cmd_diff_index, RUN_SETUP },
 327                { "diff-tree", cmd_diff_tree, RUN_SETUP },
 328                { "fast-export", cmd_fast_export, RUN_SETUP },
 329                { "fetch", cmd_fetch, RUN_SETUP },
 330                { "fetch-pack", cmd_fetch_pack, RUN_SETUP },
 331                { "fmt-merge-msg", cmd_fmt_merge_msg, RUN_SETUP },
 332                { "for-each-ref", cmd_for_each_ref, RUN_SETUP },
 333                { "format-patch", cmd_format_patch, RUN_SETUP },
 334                { "fsck", cmd_fsck, RUN_SETUP },
 335                { "fsck-objects", cmd_fsck, RUN_SETUP },
 336                { "gc", cmd_gc, RUN_SETUP },
 337                { "get-tar-commit-id", cmd_get_tar_commit_id },
 338                { "grep", cmd_grep, RUN_SETUP_GENTLY },
 339                { "hash-object", cmd_hash_object },
 340                { "help", cmd_help },
 341                { "index-pack", cmd_index_pack, RUN_SETUP_GENTLY },
 342                { "init", cmd_init_db },
 343                { "init-db", cmd_init_db },
 344                { "log", cmd_log, RUN_SETUP },
 345                { "ls-files", cmd_ls_files, RUN_SETUP },
 346                { "ls-tree", cmd_ls_tree, RUN_SETUP },
 347                { "ls-remote", cmd_ls_remote, RUN_SETUP_GENTLY },
 348                { "mailinfo", cmd_mailinfo },
 349                { "mailsplit", cmd_mailsplit },
 350                { "merge", cmd_merge, RUN_SETUP | NEED_WORK_TREE },
 351                { "merge-base", cmd_merge_base, RUN_SETUP },
 352                { "merge-file", cmd_merge_file, RUN_SETUP_GENTLY },
 353                { "merge-index", cmd_merge_index, RUN_SETUP },
 354                { "merge-ours", cmd_merge_ours, RUN_SETUP },
 355                { "merge-recursive", cmd_merge_recursive, RUN_SETUP | NEED_WORK_TREE },
 356                { "merge-recursive-ours", cmd_merge_recursive, RUN_SETUP | NEED_WORK_TREE },
 357                { "merge-recursive-theirs", cmd_merge_recursive, RUN_SETUP | NEED_WORK_TREE },
 358                { "merge-subtree", cmd_merge_recursive, RUN_SETUP | NEED_WORK_TREE },
 359                { "merge-tree", cmd_merge_tree, RUN_SETUP },
 360                { "mktag", cmd_mktag, RUN_SETUP },
 361                { "mktree", cmd_mktree, RUN_SETUP },
 362                { "mv", cmd_mv, RUN_SETUP | NEED_WORK_TREE },
 363                { "name-rev", cmd_name_rev, RUN_SETUP },
 364                { "notes", cmd_notes, RUN_SETUP },
 365                { "pack-objects", cmd_pack_objects, RUN_SETUP },
 366                { "pack-redundant", cmd_pack_redundant, 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                { "replace", cmd_replace, RUN_SETUP },
 378                { "repo-config", cmd_config, RUN_SETUP_GENTLY },
 379                { "rerere", cmd_rerere, RUN_SETUP },
 380                { "reset", cmd_reset, RUN_SETUP },
 381                { "rev-list", cmd_rev_list, RUN_SETUP },
 382                { "rev-parse", cmd_rev_parse },
 383                { "revert", cmd_revert, RUN_SETUP | NEED_WORK_TREE },
 384                { "rm", cmd_rm, RUN_SETUP },
 385                { "send-pack", cmd_send_pack, RUN_SETUP },
 386                { "shortlog", cmd_shortlog, RUN_SETUP_GENTLY | USE_PAGER },
 387                { "show-branch", cmd_show_branch, RUN_SETUP },
 388                { "show", cmd_show, RUN_SETUP },
 389                { "status", cmd_status, RUN_SETUP | NEED_WORK_TREE },
 390                { "stripspace", cmd_stripspace },
 391                { "symbolic-ref", cmd_symbolic_ref, RUN_SETUP },
 392                { "tag", cmd_tag, RUN_SETUP },
 393                { "tar-tree", cmd_tar_tree },
 394                { "unpack-file", cmd_unpack_file, RUN_SETUP },
 395                { "unpack-objects", cmd_unpack_objects, RUN_SETUP },
 396                { "update-index", cmd_update_index, RUN_SETUP },
 397                { "update-ref", cmd_update_ref, RUN_SETUP },
 398                { "update-server-info", cmd_update_server_info, RUN_SETUP },
 399                { "upload-archive", cmd_upload_archive },
 400                { "var", cmd_var, RUN_SETUP_GENTLY },
 401                { "verify-tag", cmd_verify_tag, RUN_SETUP },
 402                { "version", cmd_version },
 403                { "whatchanged", cmd_whatchanged, RUN_SETUP },
 404                { "write-tree", cmd_write_tree, RUN_SETUP },
 405                { "verify-pack", cmd_verify_pack },
 406                { "show-ref", cmd_show_ref, RUN_SETUP },
 407                { "pack-refs", cmd_pack_refs, RUN_SETUP },
 408        };
 409        int i;
 410        static const char ext[] = STRIP_EXTENSION;
 411
 412        if (sizeof(ext) > 1) {
 413                i = strlen(argv[0]) - strlen(ext);
 414                if (i > 0 && !strcmp(argv[0] + i, ext)) {
 415                        char *argv0 = xstrdup(argv[0]);
 416                        argv[0] = cmd = argv0;
 417                        argv0[i] = '\0';
 418                }
 419        }
 420
 421        /* Turn "git cmd --help" into "git help cmd" */
 422        if (argc > 1 && !strcmp(argv[1], "--help")) {
 423                argv[1] = argv[0];
 424                argv[0] = cmd = "help";
 425        }
 426
 427        for (i = 0; i < ARRAY_SIZE(commands); i++) {
 428                struct cmd_struct *p = commands+i;
 429                if (strcmp(p->cmd, cmd))
 430                        continue;
 431                exit(run_builtin(p, argc, argv));
 432        }
 433}
 434
 435static void execv_dashed_external(const char **argv)
 436{
 437        struct strbuf cmd = STRBUF_INIT;
 438        const char *tmp;
 439        int status;
 440
 441        commit_pager_choice();
 442
 443        strbuf_addf(&cmd, "git-%s", argv[0]);
 444
 445        /*
 446         * argv[0] must be the git command, but the argv array
 447         * belongs to the caller, and may be reused in
 448         * subsequent loop iterations. Save argv[0] and
 449         * restore it on error.
 450         */
 451        tmp = argv[0];
 452        argv[0] = cmd.buf;
 453
 454        trace_argv_printf(argv, "trace: exec:");
 455
 456        /*
 457         * if we fail because the command is not found, it is
 458         * OK to return. Otherwise, we just pass along the status code.
 459         */
 460        status = run_command_v_opt(argv, RUN_SILENT_EXEC_FAILURE);
 461        if (status >= 0 || errno != ENOENT)
 462                exit(status);
 463
 464        argv[0] = tmp;
 465
 466        strbuf_release(&cmd);
 467}
 468
 469static int run_argv(int *argcp, const char ***argv)
 470{
 471        int done_alias = 0;
 472
 473        while (1) {
 474                /* See if it's an internal command */
 475                handle_internal_command(*argcp, *argv);
 476
 477                /* .. then try the external ones */
 478                execv_dashed_external(*argv);
 479
 480                /* It could be an alias -- this works around the insanity
 481                 * of overriding "git log" with "git show" by having
 482                 * alias.log = show
 483                 */
 484                if (done_alias || !handle_alias(argcp, argv))
 485                        break;
 486                done_alias = 1;
 487        }
 488
 489        return done_alias;
 490}
 491
 492
 493int main(int argc, const char **argv)
 494{
 495        const char *cmd;
 496
 497        startup_info = &git_startup_info;
 498
 499        cmd = git_extract_argv0_path(argv[0]);
 500        if (!cmd)
 501                cmd = "git-help";
 502
 503        /*
 504         * "git-xxxx" is the same as "git xxxx", but we obviously:
 505         *
 506         *  - cannot take flags in between the "git" and the "xxxx".
 507         *  - cannot execute it externally (since it would just do
 508         *    the same thing over again)
 509         *
 510         * So we just directly call the internal command handler, and
 511         * die if that one cannot handle it.
 512         */
 513        if (!prefixcmp(cmd, "git-")) {
 514                cmd += 4;
 515                argv[0] = cmd;
 516                handle_internal_command(argc, argv);
 517                die("cannot handle %s internally", cmd);
 518        }
 519
 520        /* Look for flags.. */
 521        argv++;
 522        argc--;
 523        handle_options(&argv, &argc, NULL);
 524        if (argc > 0) {
 525                if (!prefixcmp(argv[0], "--"))
 526                        argv[0] += 2;
 527        } else {
 528                /* The user didn't specify a command; give them help */
 529                commit_pager_choice();
 530                printf("usage: %s\n\n", git_usage_string);
 531                list_common_cmds_help();
 532                printf("\n%s\n", git_more_info_string);
 533                exit(1);
 534        }
 535        cmd = argv[0];
 536
 537        /*
 538         * We use PATH to find git commands, but we prepend some higher
 539         * precedence paths: the "--exec-path" option, the GIT_EXEC_PATH
 540         * environment, and the $(gitexecdir) from the Makefile at build
 541         * time.
 542         */
 543        setup_path();
 544
 545        while (1) {
 546                static int done_help = 0;
 547                static int was_alias = 0;
 548                was_alias = run_argv(&argc, &argv);
 549                if (errno != ENOENT)
 550                        break;
 551                if (was_alias) {
 552                        fprintf(stderr, "Expansion of alias '%s' failed; "
 553                                "'%s' is not a git command\n",
 554                                cmd, argv[0]);
 555                        exit(1);
 556                }
 557                if (!done_help) {
 558                        cmd = argv[0] = help_unknown_cmd(cmd);
 559                        done_help = 1;
 560                } else
 561                        break;
 562        }
 563
 564        fprintf(stderr, "Failed to run command '%s': %s\n",
 565                cmd, strerror(errno));
 566
 567        return 1;
 568}