Andrew's git - gitweb.git/blob

   1#include "builtin.h"
   2#include "exec_cmd.h"
   3#include "cache.h"
   4#include "quote.h"
   5#include "run-command.h"
   6
   7const char git_usage_string[] =
   8        "git [--version] [--exec-path[=GIT_EXEC_PATH]] [-p|--paginate|--no-pager] [--bare] [--git-dir=GIT_DIR] [--work-tree=GIT_WORK_TREE] [--help] COMMAND [ARGS]";
   9
  10const char git_more_info_string[] =
  11        "See 'git help COMMAND' for more information on a specific command.";
  12
  13static int use_pager = -1;
  14struct pager_config {
  15        const char *cmd;
  16        int val;
  17};
  18
  19static int pager_command_config(const char *var, const char *value, void *data)
  20{
  21        struct pager_config *c = data;
  22        if (!prefixcmp(var, "pager.") && !strcmp(var + 6, c->cmd))
  23                c->val = git_config_bool(var, value);
  24        return 0;
  25}
  26
  27/* returns 0 for "no pager", 1 for "use pager", and -1 for "not specified" */
  28int check_pager_config(const char *cmd)
  29{
  30        struct pager_config c;
  31        c.cmd = cmd;
  32        c.val = -1;
  33        git_config(pager_command_config, &c);
  34        return c.val;
  35}
  36
  37static void commit_pager_choice(void) {
  38        switch (use_pager) {
  39        case 0:
  40                setenv("GIT_PAGER", "cat", 1);
  41                break;
  42        case 1:
  43                setup_pager();
  44                break;
  45        default:
  46                break;
  47        }
  48}
  49
  50static int handle_options(const char*** argv, int* argc, int* envchanged)
  51{
  52        int handled = 0;
  53
  54        while (*argc > 0) {
  55                const char *cmd = (*argv)[0];
  56                if (cmd[0] != '-')
  57                        break;
  58
  59                /*
  60                 * For legacy reasons, the "version" and "help"
  61                 * commands can be written with "--" prepended
  62                 * to make them look like flags.
  63                 */
  64                if (!strcmp(cmd, "--help") || !strcmp(cmd, "--version"))
  65                        break;
  66
  67                /*
  68                 * Check remaining flags.
  69                 */
  70                if (!prefixcmp(cmd, "--exec-path")) {
  71                        cmd += 11;
  72                        if (*cmd == '=')
  73                                git_set_argv_exec_path(cmd + 1);
  74                        else {
  75                                puts(git_exec_path());
  76                                exit(0);
  77                        }
  78                } else if (!strcmp(cmd, "-p") || !strcmp(cmd, "--paginate")) {
  79                        use_pager = 1;
  80                } else if (!strcmp(cmd, "--no-pager")) {
  81                        use_pager = 0;
  82                        if (envchanged)
  83                                *envchanged = 1;
  84                } else if (!strcmp(cmd, "--git-dir")) {
  85                        if (*argc < 2) {
  86                                fprintf(stderr, "No directory given for --git-dir.\n" );
  87                                usage(git_usage_string);
  88                        }
  89                        setenv(GIT_DIR_ENVIRONMENT, (*argv)[1], 1);
  90                        if (envchanged)
  91                                *envchanged = 1;
  92                        (*argv)++;
  93                        (*argc)--;
  94                        handled++;
  95                } else if (!prefixcmp(cmd, "--git-dir=")) {
  96                        setenv(GIT_DIR_ENVIRONMENT, cmd + 10, 1);
  97                        if (envchanged)
  98                                *envchanged = 1;
  99                } else if (!strcmp(cmd, "--work-tree")) {
 100                        if (*argc < 2) {
 101                                fprintf(stderr, "No directory given for --work-tree.\n" );
 102                                usage(git_usage_string);
 103                        }
 104                        setenv(GIT_WORK_TREE_ENVIRONMENT, (*argv)[1], 1);
 105                        if (envchanged)
 106                                *envchanged = 1;
 107                        (*argv)++;
 108                        (*argc)--;
 109                } else if (!prefixcmp(cmd, "--work-tree=")) {
 110                        setenv(GIT_WORK_TREE_ENVIRONMENT, cmd + 12, 1);
 111                        if (envchanged)
 112                                *envchanged = 1;
 113                } else if (!strcmp(cmd, "--bare")) {
 114                        static char git_dir[PATH_MAX+1];
 115                        is_bare_repository_cfg = 1;
 116                        setenv(GIT_DIR_ENVIRONMENT, getcwd(git_dir, sizeof(git_dir)), 0);
 117                        if (envchanged)
 118                                *envchanged = 1;
 119                } else {
 120                        fprintf(stderr, "Unknown option: %s\n", cmd);
 121                        usage(git_usage_string);
 122                }
 123
 124                (*argv)++;
 125                (*argc)--;
 126                handled++;
 127        }
 128        return handled;
 129}
 130
 131static int handle_alias(int *argcp, const char ***argv)
 132{
 133        int envchanged = 0, ret = 0, saved_errno = errno;
 134        const char *subdir;
 135        int count, option_count;
 136        const char** new_argv;
 137        const char *alias_command;
 138        char *alias_string;
 139        int unused_nongit;
 140
 141        subdir = setup_git_directory_gently(&unused_nongit);
 142
 143        alias_command = (*argv)[0];
 144        alias_string = alias_lookup(alias_command);
 145        if (alias_string) {
 146                if (alias_string[0] == '!') {
 147                        if (*argcp > 1) {
 148                                struct strbuf buf;
 149
 150                                strbuf_init(&buf, PATH_MAX);
 151                                strbuf_addstr(&buf, alias_string);
 152                                sq_quote_argv(&buf, (*argv) + 1, PATH_MAX);
 153                                free(alias_string);
 154                                alias_string = buf.buf;
 155                        }
 156                        trace_printf("trace: alias to shell cmd: %s => %s\n",
 157                                     alias_command, alias_string + 1);
 158                        ret = system(alias_string + 1);
 159                        if (ret >= 0 && WIFEXITED(ret) &&
 160                            WEXITSTATUS(ret) != 127)
 161                                exit(WEXITSTATUS(ret));
 162                        die("Failed to run '%s' when expanding alias '%s'\n",
 163                            alias_string + 1, alias_command);
 164                }
 165                count = split_cmdline(alias_string, &new_argv);
 166                if (count < 0)
 167                        die("Bad alias.%s string", alias_command);
 168                option_count = handle_options(&new_argv, &count, &envchanged);
 169                if (envchanged)
 170                        die("alias '%s' changes environment variables\n"
 171                                 "You can use '!git' in the alias to do this.",
 172                                 alias_command);
 173                memmove(new_argv - option_count, new_argv,
 174                                count * sizeof(char *));
 175                new_argv -= option_count;
 176
 177                if (count < 1)
 178                        die("empty alias for %s", alias_command);
 179
 180                if (!strcmp(alias_command, new_argv[0]))
 181                        die("recursive alias: %s", alias_command);
 182
 183                trace_argv_printf(new_argv,
 184                                  "trace: alias expansion: %s =>",
 185                                  alias_command);
 186
 187                new_argv = xrealloc(new_argv, sizeof(char*) *
 188                                    (count + *argcp + 1));
 189                /* insert after command name */
 190                memcpy(new_argv + count, *argv + 1, sizeof(char*) * *argcp);
 191                new_argv[count+*argcp] = NULL;
 192
 193                *argv = new_argv;
 194                *argcp += count - 1;
 195
 196                ret = 1;
 197        }
 198
 199        if (subdir && chdir(subdir))
 200                die("Cannot change to %s: %s", subdir, strerror(errno));
 201
 202        errno = saved_errno;
 203
 204        return ret;
 205}
 206
 207const char git_version_string[] = GIT_VERSION;
 208
 209#define RUN_SETUP       (1<<0)
 210#define USE_PAGER       (1<<1)
 211/*
 212 * require working tree to be present -- anything uses this needs
 213 * RUN_SETUP for reading from the configuration file.
 214 */
 215#define NEED_WORK_TREE  (1<<2)
 216
 217struct cmd_struct {
 218        const char *cmd;
 219        int (*fn)(int, const char **, const char *);
 220        int option;
 221};
 222
 223static int run_builtin(struct cmd_struct *p, int argc, const char **argv)
 224{
 225        int status;
 226        struct stat st;
 227        const char *prefix;
 228
 229        prefix = NULL;
 230        if (p->option & RUN_SETUP)
 231                prefix = setup_git_directory();
 232
 233        if (use_pager == -1 && p->option & RUN_SETUP)
 234                use_pager = check_pager_config(p->cmd);
 235        if (use_pager == -1 && p->option & USE_PAGER)
 236                use_pager = 1;
 237        commit_pager_choice();
 238
 239        if (p->option & NEED_WORK_TREE)
 240                setup_work_tree();
 241
 242        trace_argv_printf(argv, "trace: built-in: git");
 243
 244        status = p->fn(argc, argv, prefix);
 245        if (status)
 246                return status & 0xff;
 247
 248        /* Somebody closed stdout? */
 249        if (fstat(fileno(stdout), &st))
 250                return 0;
 251        /* Ignore write errors for pipes and sockets.. */
 252        if (S_ISFIFO(st.st_mode) || S_ISSOCK(st.st_mode))
 253                return 0;
 254
 255        /* Check for ENOSPC and EIO errors.. */
 256        if (fflush(stdout))
 257                die("write failure on standard output: %s", strerror(errno));
 258        if (ferror(stdout))
 259                die("unknown write failure on standard output");
 260        if (fclose(stdout))
 261                die("close failed on standard output: %s", strerror(errno));
 262        return 0;
 263}
 264
 265static void handle_internal_command(int argc, const char **argv)
 266{
 267        const char *cmd = argv[0];
 268        static struct cmd_struct commands[] = {
 269                { "add", cmd_add, RUN_SETUP | NEED_WORK_TREE },
 270                { "stage", cmd_add, RUN_SETUP | NEED_WORK_TREE },
 271                { "annotate", cmd_annotate, RUN_SETUP },
 272                { "apply", cmd_apply },
 273                { "archive", cmd_archive },
 274                { "blame", cmd_blame, RUN_SETUP },
 275                { "branch", cmd_branch, RUN_SETUP },
 276                { "bundle", cmd_bundle },
 277                { "cat-file", cmd_cat_file, RUN_SETUP },
 278                { "checkout", cmd_checkout, RUN_SETUP | NEED_WORK_TREE },
 279                { "checkout-index", cmd_checkout_index,
 280                        RUN_SETUP | NEED_WORK_TREE},
 281                { "check-ref-format", cmd_check_ref_format },
 282                { "check-attr", cmd_check_attr, RUN_SETUP },
 283                { "cherry", cmd_cherry, RUN_SETUP },
 284                { "cherry-pick", cmd_cherry_pick, RUN_SETUP | NEED_WORK_TREE },
 285                { "clone", cmd_clone },
 286                { "clean", cmd_clean, RUN_SETUP | NEED_WORK_TREE },
 287                { "commit", cmd_commit, RUN_SETUP | NEED_WORK_TREE },
 288                { "commit-tree", cmd_commit_tree, RUN_SETUP },
 289                { "config", cmd_config },
 290                { "count-objects", cmd_count_objects, RUN_SETUP },
 291                { "describe", cmd_describe, RUN_SETUP },
 292                { "diff", cmd_diff },
 293                { "diff-files", cmd_diff_files, RUN_SETUP | NEED_WORK_TREE },
 294                { "diff-index", cmd_diff_index, RUN_SETUP },
 295                { "diff-tree", cmd_diff_tree, RUN_SETUP },
 296                { "fast-export", cmd_fast_export, RUN_SETUP },
 297                { "fetch", cmd_fetch, RUN_SETUP },
 298                { "fetch-pack", cmd_fetch_pack, RUN_SETUP },
 299                { "fetch--tool", cmd_fetch__tool, RUN_SETUP },
 300                { "fmt-merge-msg", cmd_fmt_merge_msg, RUN_SETUP },
 301                { "for-each-ref", cmd_for_each_ref, RUN_SETUP },
 302                { "format-patch", cmd_format_patch, RUN_SETUP },
 303                { "fsck", cmd_fsck, RUN_SETUP },
 304                { "fsck-objects", cmd_fsck, RUN_SETUP },
 305                { "gc", cmd_gc, RUN_SETUP },
 306                { "get-tar-commit-id", cmd_get_tar_commit_id },
 307                { "grep", cmd_grep, RUN_SETUP | USE_PAGER },
 308                { "help", cmd_help },
 309#ifndef NO_CURL
 310                { "http-fetch", cmd_http_fetch, RUN_SETUP },
 311#endif
 312                { "init", cmd_init_db },
 313                { "init-db", cmd_init_db },
 314                { "log", cmd_log, RUN_SETUP | USE_PAGER },
 315                { "ls-files", cmd_ls_files, RUN_SETUP },
 316                { "ls-tree", cmd_ls_tree, RUN_SETUP },
 317                { "ls-remote", cmd_ls_remote },
 318                { "mailinfo", cmd_mailinfo },
 319                { "mailsplit", cmd_mailsplit },
 320                { "merge", cmd_merge, RUN_SETUP | NEED_WORK_TREE },
 321                { "merge-base", cmd_merge_base, RUN_SETUP },
 322                { "merge-file", cmd_merge_file },
 323                { "merge-ours", cmd_merge_ours, RUN_SETUP },
 324                { "merge-recursive", cmd_merge_recursive, RUN_SETUP | NEED_WORK_TREE },
 325                { "merge-subtree", cmd_merge_recursive, RUN_SETUP | NEED_WORK_TREE },
 326                { "mv", cmd_mv, RUN_SETUP | NEED_WORK_TREE },
 327                { "name-rev", cmd_name_rev, RUN_SETUP },
 328                { "pack-objects", cmd_pack_objects, RUN_SETUP },
 329                { "peek-remote", cmd_ls_remote },
 330                { "pickaxe", cmd_blame, RUN_SETUP },
 331                { "prune", cmd_prune, RUN_SETUP },
 332                { "prune-packed", cmd_prune_packed, RUN_SETUP },
 333                { "push", cmd_push, RUN_SETUP },
 334                { "read-tree", cmd_read_tree, RUN_SETUP },
 335                { "receive-pack", cmd_receive_pack },
 336                { "reflog", cmd_reflog, RUN_SETUP },
 337                { "remote", cmd_remote, RUN_SETUP },
 338                { "repo-config", cmd_config },
 339                { "rerere", cmd_rerere, RUN_SETUP },
 340                { "reset", cmd_reset, RUN_SETUP },
 341                { "rev-list", cmd_rev_list, RUN_SETUP },
 342                { "rev-parse", cmd_rev_parse },
 343                { "revert", cmd_revert, RUN_SETUP | NEED_WORK_TREE },
 344                { "rm", cmd_rm, RUN_SETUP },
 345                { "send-pack", cmd_send_pack, RUN_SETUP },
 346                { "shortlog", cmd_shortlog, USE_PAGER },
 347                { "show-branch", cmd_show_branch, RUN_SETUP },
 348                { "show", cmd_show, RUN_SETUP | USE_PAGER },
 349                { "status", cmd_status, RUN_SETUP | NEED_WORK_TREE },
 350                { "stripspace", cmd_stripspace },
 351                { "symbolic-ref", cmd_symbolic_ref, RUN_SETUP },
 352                { "tag", cmd_tag, RUN_SETUP },
 353                { "tar-tree", cmd_tar_tree },
 354                { "unpack-objects", cmd_unpack_objects, RUN_SETUP },
 355                { "update-index", cmd_update_index, RUN_SETUP },
 356                { "update-ref", cmd_update_ref, RUN_SETUP },
 357                { "upload-archive", cmd_upload_archive },
 358                { "verify-tag", cmd_verify_tag, RUN_SETUP },
 359                { "version", cmd_version },
 360                { "whatchanged", cmd_whatchanged, RUN_SETUP | USE_PAGER },
 361                { "write-tree", cmd_write_tree, RUN_SETUP },
 362                { "verify-pack", cmd_verify_pack },
 363                { "show-ref", cmd_show_ref, RUN_SETUP },
 364                { "pack-refs", cmd_pack_refs, RUN_SETUP },
 365        };
 366        int i;
 367        static const char ext[] = STRIP_EXTENSION;
 368
 369        if (sizeof(ext) > 1) {
 370                i = strlen(argv[0]) - strlen(ext);
 371                if (i > 0 && !strcmp(argv[0] + i, ext)) {
 372                        char *argv0 = xstrdup(argv[0]);
 373                        argv[0] = cmd = argv0;
 374                        argv0[i] = '\0';
 375                }
 376        }
 377
 378        /* Turn "git cmd --help" into "git help cmd" */
 379        if (argc > 1 && !strcmp(argv[1], "--help")) {
 380                argv[1] = argv[0];
 381                argv[0] = cmd = "help";
 382        }
 383
 384        for (i = 0; i < ARRAY_SIZE(commands); i++) {
 385                struct cmd_struct *p = commands+i;
 386                if (strcmp(p->cmd, cmd))
 387                        continue;
 388                exit(run_builtin(p, argc, argv));
 389        }
 390}
 391
 392static void execv_dashed_external(const char **argv)
 393{
 394        struct strbuf cmd = STRBUF_INIT;
 395        const char *tmp;
 396        int status;
 397
 398        strbuf_addf(&cmd, "git-%s", argv[0]);
 399
 400        /*
 401         * argv[0] must be the git command, but the argv array
 402         * belongs to the caller, and may be reused in
 403         * subsequent loop iterations. Save argv[0] and
 404         * restore it on error.
 405         */
 406        tmp = argv[0];
 407        argv[0] = cmd.buf;
 408
 409        trace_argv_printf(argv, "trace: exec:");
 410
 411        /*
 412         * if we fail because the command is not found, it is
 413         * OK to return. Otherwise, we just pass along the status code.
 414         */
 415        status = run_command_v_opt(argv, 0);
 416        if (status != -ERR_RUN_COMMAND_EXEC) {
 417                if (IS_RUN_COMMAND_ERR(status))
 418                        die("unable to run '%s'", argv[0]);
 419                exit(-status);
 420        }
 421        errno = ENOENT; /* as if we called execvp */
 422
 423        argv[0] = tmp;
 424
 425        strbuf_release(&cmd);
 426}
 427
 428
 429int main(int argc, const char **argv)
 430{
 431        const char *cmd = argv[0] && *argv[0] ? argv[0] : "git-help";
 432        char *slash = (char *)cmd + strlen(cmd);
 433        int done_alias = 0;
 434
 435        /*
 436         * Take the basename of argv[0] as the command
 437         * name, and the dirname as the default exec_path
 438         * if we don't have anything better.
 439         */
 440        do
 441                --slash;
 442        while (cmd <= slash && !is_dir_sep(*slash));
 443        if (cmd <= slash) {
 444                *slash++ = 0;
 445                git_set_argv0_path(cmd);
 446                cmd = slash;
 447        }
 448
 449        /*
 450         * "git-xxxx" is the same as "git xxxx", but we obviously:
 451         *
 452         *  - cannot take flags in between the "git" and the "xxxx".
 453         *  - cannot execute it externally (since it would just do
 454         *    the same thing over again)
 455         *
 456         * So we just directly call the internal command handler, and
 457         * die if that one cannot handle it.
 458         */
 459        if (!prefixcmp(cmd, "git-")) {
 460                cmd += 4;
 461                argv[0] = cmd;
 462                handle_internal_command(argc, argv);
 463                die("cannot handle %s internally", cmd);
 464        }
 465
 466        /* Look for flags.. */
 467        argv++;
 468        argc--;
 469        handle_options(&argv, &argc, NULL);
 470        commit_pager_choice();
 471        if (argc > 0) {
 472                if (!prefixcmp(argv[0], "--"))
 473                        argv[0] += 2;
 474        } else {
 475                /* The user didn't specify a command; give them help */
 476                printf("usage: %s\n\n", git_usage_string);
 477                list_common_cmds_help();
 478                printf("\n%s\n", git_more_info_string);
 479                exit(1);
 480        }
 481        cmd = argv[0];
 482
 483        /*
 484         * We use PATH to find git commands, but we prepend some higher
 485         * precidence paths: the "--exec-path" option, the GIT_EXEC_PATH
 486         * environment, and the $(gitexecdir) from the Makefile at build
 487         * time.
 488         */
 489        setup_path();
 490
 491        while (1) {
 492                /* See if it's an internal command */
 493                handle_internal_command(argc, argv);
 494
 495                /* .. then try the external ones */
 496                execv_dashed_external(argv);
 497
 498                /* It could be an alias -- this works around the insanity
 499                 * of overriding "git log" with "git show" by having
 500                 * alias.log = show
 501                 */
 502                if (done_alias || !handle_alias(&argc, &argv))
 503                        break;
 504                done_alias = 1;
 505        }
 506
 507        if (errno == ENOENT) {
 508                if (done_alias) {
 509                        fprintf(stderr, "Expansion of alias '%s' failed; "
 510                                "'%s' is not a git-command\n",
 511                                cmd, argv[0]);
 512                        exit(1);
 513                }
 514                argv[0] = help_unknown_cmd(cmd);
 515                handle_internal_command(argc, argv);
 516                execv_dashed_external(argv);
 517        }
 518
 519        fprintf(stderr, "Failed to run command '%s': %s\n",
 520                cmd, strerror(errno));
 521
 522        return 1;
 523}