Andrew's git / gitweb.git / git.c
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git.con commit Merge branch 'maint' (79b4fde)
   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]] [--html-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, "--html-path")) {
  79                        puts(system_path(GIT_HTML_PATH));
  80                        exit(0);
  81                } else if (!strcmp(cmd, "-p") || !strcmp(cmd, "--paginate")) {
  82                        use_pager = 1;
  83                } else if (!strcmp(cmd, "--no-pager")) {
  84                        use_pager = 0;
  85                        if (envchanged)
  86                                *envchanged = 1;
  87                } else if (!strcmp(cmd, "--git-dir")) {
  88                        if (*argc < 2) {
  89                                fprintf(stderr, "No directory given for --git-dir.\n" );
  90                                usage(git_usage_string);
  91                        }
  92                        setenv(GIT_DIR_ENVIRONMENT, (*argv)[1], 1);
  93                        if (envchanged)
  94                                *envchanged = 1;
  95                        (*argv)++;
  96                        (*argc)--;
  97                        handled++;
  98                } else if (!prefixcmp(cmd, "--git-dir=")) {
  99                        setenv(GIT_DIR_ENVIRONMENT, cmd + 10, 1);
 100                        if (envchanged)
 101                                *envchanged = 1;
 102                } else if (!strcmp(cmd, "--work-tree")) {
 103                        if (*argc < 2) {
 104                                fprintf(stderr, "No directory given for --work-tree.\n" );
 105                                usage(git_usage_string);
 106                        }
 107                        setenv(GIT_WORK_TREE_ENVIRONMENT, (*argv)[1], 1);
 108                        if (envchanged)
 109                                *envchanged = 1;
 110                        (*argv)++;
 111                        (*argc)--;
 112                } else if (!prefixcmp(cmd, "--work-tree=")) {
 113                        setenv(GIT_WORK_TREE_ENVIRONMENT, cmd + 12, 1);
 114                        if (envchanged)
 115                                *envchanged = 1;
 116                } else if (!strcmp(cmd, "--bare")) {
 117                        static char git_dir[PATH_MAX+1];
 118                        is_bare_repository_cfg = 1;
 119                        setenv(GIT_DIR_ENVIRONMENT, getcwd(git_dir, sizeof(git_dir)), 0);
 120                        if (envchanged)
 121                                *envchanged = 1;
 122                } else {
 123                        fprintf(stderr, "Unknown option: %s\n", cmd);
 124                        usage(git_usage_string);
 125                }
 126
 127                (*argv)++;
 128                (*argc)--;
 129                handled++;
 130        }
 131        return handled;
 132}
 133
 134static int handle_alias(int *argcp, const char ***argv)
 135{
 136        int envchanged = 0, ret = 0, saved_errno = errno;
 137        const char *subdir;
 138        int count, option_count;
 139        const char **new_argv;
 140        const char *alias_command;
 141        char *alias_string;
 142        int unused_nongit;
 143
 144        subdir = setup_git_directory_gently(&unused_nongit);
 145
 146        alias_command = (*argv)[0];
 147        alias_string = alias_lookup(alias_command);
 148        if (alias_string) {
 149                if (alias_string[0] == '!') {
 150                        if (*argcp > 1) {
 151                                struct strbuf buf;
 152
 153                                strbuf_init(&buf, PATH_MAX);
 154                                strbuf_addstr(&buf, alias_string);
 155                                sq_quote_argv(&buf, (*argv) + 1, PATH_MAX);
 156                                free(alias_string);
 157                                alias_string = buf.buf;
 158                        }
 159                        trace_printf("trace: alias to shell cmd: %s => %s\n",
 160                                     alias_command, alias_string + 1);
 161                        ret = system(alias_string + 1);
 162                        if (ret >= 0 && WIFEXITED(ret) &&
 163                            WEXITSTATUS(ret) != 127)
 164                                exit(WEXITSTATUS(ret));
 165                        die("Failed to run '%s' when expanding alias '%s'",
 166                            alias_string + 1, alias_command);
 167                }
 168                count = split_cmdline(alias_string, &new_argv);
 169                if (count < 0)
 170                        die("Bad alias.%s string", alias_command);
 171                option_count = handle_options(&new_argv, &count, &envchanged);
 172                if (envchanged)
 173                        die("alias '%s' changes environment variables\n"
 174                                 "You can use '!git' in the alias to do this.",
 175                                 alias_command);
 176                memmove(new_argv - option_count, new_argv,
 177                                count * sizeof(char *));
 178                new_argv -= option_count;
 179
 180                if (count < 1)
 181                        die("empty alias for %s", alias_command);
 182
 183                if (!strcmp(alias_command, new_argv[0]))
 184                        die("recursive alias: %s", alias_command);
 185
 186                trace_argv_printf(new_argv,
 187                                  "trace: alias expansion: %s =>",
 188                                  alias_command);
 189
 190                new_argv = xrealloc(new_argv, sizeof(char *) *
 191                                    (count + *argcp));
 192                /* insert after command name */
 193                memcpy(new_argv + count, *argv + 1, sizeof(char *) * *argcp);
 194
 195                *argv = new_argv;
 196                *argcp += count - 1;
 197
 198                ret = 1;
 199        }
 200
 201        if (subdir && chdir(subdir))
 202                die_errno("Cannot change to '%s'", subdir);
 203
 204        errno = saved_errno;
 205
 206        return ret;
 207}
 208
 209const char git_version_string[] = GIT_VERSION;
 210
 211#define RUN_SETUP       (1<<0)
 212#define USE_PAGER       (1<<1)
 213/*
 214 * require working tree to be present -- anything uses this needs
 215 * RUN_SETUP for reading from the configuration file.
 216 */
 217#define NEED_WORK_TREE  (1<<2)
 218
 219struct cmd_struct {
 220        const char *cmd;
 221        int (*fn)(int, const char **, const char *);
 222        int option;
 223};
 224
 225static int run_builtin(struct cmd_struct *p, int argc, const char **argv)
 226{
 227        int status;
 228        struct stat st;
 229        const char *prefix;
 230
 231        prefix = NULL;
 232        if (p->option & RUN_SETUP)
 233                prefix = setup_git_directory();
 234
 235        if (use_pager == -1 && p->option & RUN_SETUP)
 236                use_pager = check_pager_config(p->cmd);
 237        if (use_pager == -1 && p->option & USE_PAGER)
 238                use_pager = 1;
 239        commit_pager_choice();
 240
 241        if (p->option & NEED_WORK_TREE)
 242                setup_work_tree();
 243
 244        trace_argv_printf(argv, "trace: built-in: git");
 245
 246        status = p->fn(argc, argv, prefix);
 247        if (status)
 248                return status;
 249
 250        /* Somebody closed stdout? */
 251        if (fstat(fileno(stdout), &st))
 252                return 0;
 253        /* Ignore write errors for pipes and sockets.. */
 254        if (S_ISFIFO(st.st_mode) || S_ISSOCK(st.st_mode))
 255                return 0;
 256
 257        /* Check for ENOSPC and EIO errors.. */
 258        if (fflush(stdout))
 259                die_errno("write failure on standard output");
 260        if (ferror(stdout))
 261                die("unknown write failure on standard output");
 262        if (fclose(stdout))
 263                die_errno("close failed on standard output");
 264        return 0;
 265}
 266
 267static void handle_internal_command(int argc, const char **argv)
 268{
 269        const char *cmd = argv[0];
 270        static struct cmd_struct commands[] = {
 271                { "add", cmd_add, RUN_SETUP | NEED_WORK_TREE },
 272                { "stage", cmd_add, RUN_SETUP | NEED_WORK_TREE },
 273                { "annotate", cmd_annotate, RUN_SETUP },
 274                { "apply", cmd_apply },
 275                { "archive", cmd_archive },
 276                { "bisect--helper", cmd_bisect__helper, RUN_SETUP | NEED_WORK_TREE },
 277                { "blame", cmd_blame, RUN_SETUP },
 278                { "branch", cmd_branch, RUN_SETUP },
 279                { "bundle", cmd_bundle },
 280                { "cat-file", cmd_cat_file, RUN_SETUP },
 281                { "checkout", cmd_checkout, RUN_SETUP | NEED_WORK_TREE },
 282                { "checkout-index", cmd_checkout_index,
 283                        RUN_SETUP | NEED_WORK_TREE},
 284                { "check-ref-format", cmd_check_ref_format },
 285                { "check-attr", cmd_check_attr, RUN_SETUP },
 286                { "cherry", cmd_cherry, RUN_SETUP },
 287                { "cherry-pick", cmd_cherry_pick, RUN_SETUP | NEED_WORK_TREE },
 288                { "clone", cmd_clone },
 289                { "clean", cmd_clean, RUN_SETUP | NEED_WORK_TREE },
 290                { "commit", cmd_commit, RUN_SETUP | NEED_WORK_TREE },
 291                { "commit-tree", cmd_commit_tree, RUN_SETUP },
 292                { "config", cmd_config },
 293                { "count-objects", cmd_count_objects, RUN_SETUP },
 294                { "describe", cmd_describe, RUN_SETUP },
 295                { "diff", cmd_diff },
 296                { "diff-files", cmd_diff_files, RUN_SETUP | NEED_WORK_TREE },
 297                { "diff-index", cmd_diff_index, RUN_SETUP },
 298                { "diff-tree", cmd_diff_tree, RUN_SETUP },
 299                { "fast-export", cmd_fast_export, RUN_SETUP },
 300                { "fetch", cmd_fetch, RUN_SETUP },
 301                { "fetch-pack", cmd_fetch_pack, RUN_SETUP },
 302                { "fetch--tool", cmd_fetch__tool, RUN_SETUP },
 303                { "fmt-merge-msg", cmd_fmt_merge_msg, RUN_SETUP },
 304                { "for-each-ref", cmd_for_each_ref, RUN_SETUP },
 305                { "format-patch", cmd_format_patch, RUN_SETUP },
 306                { "fsck", cmd_fsck, RUN_SETUP },
 307                { "fsck-objects", cmd_fsck, RUN_SETUP },
 308                { "gc", cmd_gc, RUN_SETUP },
 309                { "get-tar-commit-id", cmd_get_tar_commit_id },
 310                { "grep", cmd_grep, RUN_SETUP | USE_PAGER },
 311                { "help", cmd_help },
 312#ifndef NO_CURL
 313                { "http-fetch", cmd_http_fetch, RUN_SETUP },
 314#endif
 315                { "init", cmd_init_db },
 316                { "init-db", cmd_init_db },
 317                { "log", cmd_log, RUN_SETUP | USE_PAGER },
 318                { "ls-files", cmd_ls_files, RUN_SETUP },
 319                { "ls-tree", cmd_ls_tree, RUN_SETUP },
 320                { "ls-remote", cmd_ls_remote },
 321                { "mailinfo", cmd_mailinfo },
 322                { "mailsplit", cmd_mailsplit },
 323                { "merge", cmd_merge, RUN_SETUP | NEED_WORK_TREE },
 324                { "merge-base", cmd_merge_base, RUN_SETUP },
 325                { "merge-file", cmd_merge_file },
 326                { "merge-ours", cmd_merge_ours, RUN_SETUP },
 327                { "merge-recursive", cmd_merge_recursive, RUN_SETUP | NEED_WORK_TREE },
 328                { "merge-subtree", cmd_merge_recursive, RUN_SETUP | NEED_WORK_TREE },
 329                { "mktree", cmd_mktree, RUN_SETUP },
 330                { "mv", cmd_mv, RUN_SETUP | NEED_WORK_TREE },
 331                { "name-rev", cmd_name_rev, RUN_SETUP },
 332                { "pack-objects", cmd_pack_objects, RUN_SETUP },
 333                { "peek-remote", cmd_ls_remote },
 334                { "pickaxe", cmd_blame, RUN_SETUP },
 335                { "prune", cmd_prune, RUN_SETUP },
 336                { "prune-packed", cmd_prune_packed, RUN_SETUP },
 337                { "push", cmd_push, RUN_SETUP },
 338                { "read-tree", cmd_read_tree, RUN_SETUP },
 339                { "receive-pack", cmd_receive_pack },
 340                { "reflog", cmd_reflog, RUN_SETUP },
 341                { "remote", cmd_remote, RUN_SETUP },
 342                { "replace", cmd_replace, RUN_SETUP },
 343                { "repo-config", cmd_config },
 344                { "rerere", cmd_rerere, RUN_SETUP },
 345                { "reset", cmd_reset, RUN_SETUP },
 346                { "rev-list", cmd_rev_list, RUN_SETUP },
 347                { "rev-parse", cmd_rev_parse },
 348                { "revert", cmd_revert, RUN_SETUP | NEED_WORK_TREE },
 349                { "rm", cmd_rm, RUN_SETUP },
 350                { "send-pack", cmd_send_pack, RUN_SETUP },
 351                { "shortlog", cmd_shortlog, USE_PAGER },
 352                { "show-branch", cmd_show_branch, RUN_SETUP },
 353                { "show", cmd_show, RUN_SETUP | USE_PAGER },
 354                { "status", cmd_status, RUN_SETUP | NEED_WORK_TREE },
 355                { "stripspace", cmd_stripspace },
 356                { "symbolic-ref", cmd_symbolic_ref, RUN_SETUP },
 357                { "tag", cmd_tag, RUN_SETUP },
 358                { "tar-tree", cmd_tar_tree },
 359                { "unpack-objects", cmd_unpack_objects, RUN_SETUP },
 360                { "update-index", cmd_update_index, RUN_SETUP },
 361                { "update-ref", cmd_update_ref, RUN_SETUP },
 362                { "update-server-info", cmd_update_server_info, RUN_SETUP },
 363                { "upload-archive", cmd_upload_archive },
 364                { "verify-tag", cmd_verify_tag, RUN_SETUP },
 365                { "version", cmd_version },
 366                { "whatchanged", cmd_whatchanged, RUN_SETUP | USE_PAGER },
 367                { "write-tree", cmd_write_tree, RUN_SETUP },
 368                { "verify-pack", cmd_verify_pack },
 369                { "show-ref", cmd_show_ref, RUN_SETUP },
 370                { "pack-refs", cmd_pack_refs, RUN_SETUP },
 371        };
 372        int i;
 373        static const char ext[] = STRIP_EXTENSION;
 374
 375        if (sizeof(ext) > 1) {
 376                i = strlen(argv[0]) - strlen(ext);
 377                if (i > 0 && !strcmp(argv[0] + i, ext)) {
 378                        char *argv0 = xstrdup(argv[0]);
 379                        argv[0] = cmd = argv0;
 380                        argv0[i] = '\0';
 381                }
 382        }
 383
 384        /* Turn "git cmd --help" into "git help cmd" */
 385        if (argc > 1 && !strcmp(argv[1], "--help")) {
 386                argv[1] = argv[0];
 387                argv[0] = cmd = "help";
 388        }
 389
 390        for (i = 0; i < ARRAY_SIZE(commands); i++) {
 391                struct cmd_struct *p = commands+i;
 392                if (strcmp(p->cmd, cmd))
 393                        continue;
 394                exit(run_builtin(p, argc, argv));
 395        }
 396}
 397
 398static void execv_dashed_external(const char **argv)
 399{
 400        struct strbuf cmd = STRBUF_INIT;
 401        const char *tmp;
 402        int status;
 403
 404        strbuf_addf(&cmd, "git-%s", argv[0]);
 405
 406        /*
 407         * argv[0] must be the git command, but the argv array
 408         * belongs to the caller, and may be reused in
 409         * subsequent loop iterations. Save argv[0] and
 410         * restore it on error.
 411         */
 412        tmp = argv[0];
 413        argv[0] = cmd.buf;
 414
 415        trace_argv_printf(argv, "trace: exec:");
 416
 417        /*
 418         * if we fail because the command is not found, it is
 419         * OK to return. Otherwise, we just pass along the status code.
 420         */
 421        status = run_command_v_opt(argv, RUN_SILENT_EXEC_FAILURE);
 422        if (status >= 0 || errno != ENOENT)
 423                exit(status);
 424
 425        argv[0] = tmp;
 426
 427        strbuf_release(&cmd);
 428}
 429
 430static int run_argv(int *argcp, const char ***argv)
 431{
 432        int done_alias = 0;
 433
 434        while (1) {
 435                /* See if it's an internal command */
 436                handle_internal_command(*argcp, *argv);
 437
 438                /* .. then try the external ones */
 439                execv_dashed_external(*argv);
 440
 441                /* It could be an alias -- this works around the insanity
 442                 * of overriding "git log" with "git show" by having
 443                 * alias.log = show
 444                 */
 445                if (done_alias || !handle_alias(argcp, argv))
 446                        break;
 447                done_alias = 1;
 448        }
 449
 450        return done_alias;
 451}
 452
 453
 454int main(int argc, const char **argv)
 455{
 456        const char *cmd;
 457
 458        cmd = git_extract_argv0_path(argv[0]);
 459        if (!cmd)
 460                cmd = "git-help";
 461
 462        /*
 463         * "git-xxxx" is the same as "git xxxx", but we obviously:
 464         *
 465         *  - cannot take flags in between the "git" and the "xxxx".
 466         *  - cannot execute it externally (since it would just do
 467         *    the same thing over again)
 468         *
 469         * So we just directly call the internal command handler, and
 470         * die if that one cannot handle it.
 471         */
 472        if (!prefixcmp(cmd, "git-")) {
 473                cmd += 4;
 474                argv[0] = cmd;
 475                handle_internal_command(argc, argv);
 476                die("cannot handle %s internally", cmd);
 477        }
 478
 479        /* Look for flags.. */
 480        argv++;
 481        argc--;
 482        handle_options(&argv, &argc, NULL);
 483        commit_pager_choice();
 484        if (argc > 0) {
 485                if (!prefixcmp(argv[0], "--"))
 486                        argv[0] += 2;
 487        } else {
 488                /* The user didn't specify a command; give them help */
 489                printf("usage: %s\n\n", git_usage_string);
 490                list_common_cmds_help();
 491                printf("\n%s\n", git_more_info_string);
 492                exit(1);
 493        }
 494        cmd = argv[0];
 495
 496        /*
 497         * We use PATH to find git commands, but we prepend some higher
 498         * precedence paths: the "--exec-path" option, the GIT_EXEC_PATH
 499         * environment, and the $(gitexecdir) from the Makefile at build
 500         * time.
 501         */
 502        setup_path();
 503
 504        while (1) {
 505                static int done_help = 0;
 506                static int was_alias = 0;
 507                was_alias = run_argv(&argc, &argv);
 508                if (errno != ENOENT)
 509                        break;
 510                if (was_alias) {
 511                        fprintf(stderr, "Expansion of alias '%s' failed; "
 512                                "'%s' is not a git-command\n",
 513                                cmd, argv[0]);
 514                        exit(1);
 515                }
 516                if (!done_help) {
 517                        cmd = argv[0] = help_unknown_cmd(cmd);
 518                        done_help = 1;
 519                } else
 520                        break;
 521        }
 522
 523        fprintf(stderr, "Failed to run command '%s': %s\n",
 524                cmd, strerror(errno));
 525
 526        return 1;
 527}