Andrew's git / gitweb.git / git.c
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git.con commit Merge branch 'ab/bundle' (ef567fe)
   1#include "builtin.h"
   2#include "exec_cmd.h"
   3#include "cache.h"
   4#include "quote.h"
   5
   6const char git_usage_string[] =
   7        "git [--version] [--exec-path[=GIT_EXEC_PATH]] [-p|--paginate|--no-pager] [--bare] [--git-dir=GIT_DIR] [--work-tree=GIT_WORK_TREE] [--help] COMMAND [ARGS]";
   8
   9const char git_more_info_string[] =
  10        "See 'git help COMMAND' for more information on a specific command.";
  11
  12static int use_pager = -1;
  13struct pager_config {
  14        const char *cmd;
  15        int val;
  16};
  17
  18static int pager_command_config(const char *var, const char *value, void *data)
  19{
  20        struct pager_config *c = data;
  21        if (!prefixcmp(var, "pager.") && !strcmp(var + 6, c->cmd))
  22                c->val = git_config_bool(var, value);
  23        return 0;
  24}
  25
  26/* returns 0 for "no pager", 1 for "use pager", and -1 for "not specified" */
  27int check_pager_config(const char *cmd)
  28{
  29        struct pager_config c;
  30        c.cmd = cmd;
  31        c.val = -1;
  32        git_config(pager_command_config, &c);
  33        return c.val;
  34}
  35
  36static void commit_pager_choice(void) {
  37        switch (use_pager) {
  38        case 0:
  39                setenv("GIT_PAGER", "cat", 1);
  40                break;
  41        case 1:
  42                setup_pager();
  43                break;
  44        default:
  45                break;
  46        }
  47}
  48
  49static int handle_options(const char*** argv, int* argc, int* envchanged)
  50{
  51        int handled = 0;
  52
  53        while (*argc > 0) {
  54                const char *cmd = (*argv)[0];
  55                if (cmd[0] != '-')
  56                        break;
  57
  58                /*
  59                 * For legacy reasons, the "version" and "help"
  60                 * commands can be written with "--" prepended
  61                 * to make them look like flags.
  62                 */
  63                if (!strcmp(cmd, "--help") || !strcmp(cmd, "--version"))
  64                        break;
  65
  66                /*
  67                 * Check remaining flags.
  68                 */
  69                if (!prefixcmp(cmd, "--exec-path")) {
  70                        cmd += 11;
  71                        if (*cmd == '=')
  72                                git_set_argv_exec_path(cmd + 1);
  73                        else {
  74                                puts(git_exec_path());
  75                                exit(0);
  76                        }
  77                } else if (!strcmp(cmd, "-p") || !strcmp(cmd, "--paginate")) {
  78                        use_pager = 1;
  79                } else if (!strcmp(cmd, "--no-pager")) {
  80                        use_pager = 0;
  81                        if (envchanged)
  82                                *envchanged = 1;
  83                } else if (!strcmp(cmd, "--git-dir")) {
  84                        if (*argc < 2) {
  85                                fprintf(stderr, "No directory given for --git-dir.\n" );
  86                                usage(git_usage_string);
  87                        }
  88                        setenv(GIT_DIR_ENVIRONMENT, (*argv)[1], 1);
  89                        if (envchanged)
  90                                *envchanged = 1;
  91                        (*argv)++;
  92                        (*argc)--;
  93                        handled++;
  94                } else if (!prefixcmp(cmd, "--git-dir=")) {
  95                        setenv(GIT_DIR_ENVIRONMENT, cmd + 10, 1);
  96                        if (envchanged)
  97                                *envchanged = 1;
  98                } else if (!strcmp(cmd, "--work-tree")) {
  99                        if (*argc < 2) {
 100                                fprintf(stderr, "No directory given for --work-tree.\n" );
 101                                usage(git_usage_string);
 102                        }
 103                        setenv(GIT_WORK_TREE_ENVIRONMENT, (*argv)[1], 1);
 104                        if (envchanged)
 105                                *envchanged = 1;
 106                        (*argv)++;
 107                        (*argc)--;
 108                } else if (!prefixcmp(cmd, "--work-tree=")) {
 109                        setenv(GIT_WORK_TREE_ENVIRONMENT, cmd + 12, 1);
 110                        if (envchanged)
 111                                *envchanged = 1;
 112                } else if (!strcmp(cmd, "--bare")) {
 113                        static char git_dir[PATH_MAX+1];
 114                        is_bare_repository_cfg = 1;
 115                        setenv(GIT_DIR_ENVIRONMENT, getcwd(git_dir, sizeof(git_dir)), 0);
 116                        if (envchanged)
 117                                *envchanged = 1;
 118                } else {
 119                        fprintf(stderr, "Unknown option: %s\n", cmd);
 120                        usage(git_usage_string);
 121                }
 122
 123                (*argv)++;
 124                (*argc)--;
 125                handled++;
 126        }
 127        return handled;
 128}
 129
 130static int split_cmdline(char *cmdline, const char ***argv)
 131{
 132        int src, dst, count = 0, size = 16;
 133        char quoted = 0;
 134
 135        *argv = xmalloc(sizeof(char*) * size);
 136
 137        /* split alias_string */
 138        (*argv)[count++] = cmdline;
 139        for (src = dst = 0; cmdline[src];) {
 140                char c = cmdline[src];
 141                if (!quoted && isspace(c)) {
 142                        cmdline[dst++] = 0;
 143                        while (cmdline[++src]
 144                                        && isspace(cmdline[src]))
 145                                ; /* skip */
 146                        if (count >= size) {
 147                                size += 16;
 148                                *argv = xrealloc(*argv, sizeof(char*) * size);
 149                        }
 150                        (*argv)[count++] = cmdline + dst;
 151                } else if(!quoted && (c == '\'' || c == '"')) {
 152                        quoted = c;
 153                        src++;
 154                } else if (c == quoted) {
 155                        quoted = 0;
 156                        src++;
 157                } else {
 158                        if (c == '\\' && quoted != '\'') {
 159                                src++;
 160                                c = cmdline[src];
 161                                if (!c) {
 162                                        free(*argv);
 163                                        *argv = NULL;
 164                                        return error("cmdline ends with \\");
 165                                }
 166                        }
 167                        cmdline[dst++] = c;
 168                        src++;
 169                }
 170        }
 171
 172        cmdline[dst] = 0;
 173
 174        if (quoted) {
 175                free(*argv);
 176                *argv = NULL;
 177                return error("unclosed quote");
 178        }
 179
 180        return count;
 181}
 182
 183static int handle_alias(int *argcp, const char ***argv)
 184{
 185        int envchanged = 0, ret = 0, saved_errno = errno;
 186        const char *subdir;
 187        int count, option_count;
 188        const char** new_argv;
 189        const char *alias_command;
 190        char *alias_string;
 191        int unused_nongit;
 192
 193        subdir = setup_git_directory_gently(&unused_nongit);
 194
 195        alias_command = (*argv)[0];
 196        alias_string = alias_lookup(alias_command);
 197        if (alias_string) {
 198                if (alias_string[0] == '!') {
 199                        if (*argcp > 1) {
 200                                struct strbuf buf;
 201
 202                                strbuf_init(&buf, PATH_MAX);
 203                                strbuf_addstr(&buf, alias_string);
 204                                sq_quote_argv(&buf, (*argv) + 1, PATH_MAX);
 205                                free(alias_string);
 206                                alias_string = buf.buf;
 207                        }
 208                        trace_printf("trace: alias to shell cmd: %s => %s\n",
 209                                     alias_command, alias_string + 1);
 210                        ret = system(alias_string + 1);
 211                        if (ret >= 0 && WIFEXITED(ret) &&
 212                            WEXITSTATUS(ret) != 127)
 213                                exit(WEXITSTATUS(ret));
 214                        die("Failed to run '%s' when expanding alias '%s'\n",
 215                            alias_string + 1, alias_command);
 216                }
 217                count = split_cmdline(alias_string, &new_argv);
 218                option_count = handle_options(&new_argv, &count, &envchanged);
 219                if (envchanged)
 220                        die("alias '%s' changes environment variables\n"
 221                                 "You can use '!git' in the alias to do this.",
 222                                 alias_command);
 223                memmove(new_argv - option_count, new_argv,
 224                                count * sizeof(char *));
 225                new_argv -= option_count;
 226
 227                if (count < 1)
 228                        die("empty alias for %s", alias_command);
 229
 230                if (!strcmp(alias_command, new_argv[0]))
 231                        die("recursive alias: %s", alias_command);
 232
 233                trace_argv_printf(new_argv,
 234                                  "trace: alias expansion: %s =>",
 235                                  alias_command);
 236
 237                new_argv = xrealloc(new_argv, sizeof(char*) *
 238                                    (count + *argcp + 1));
 239                /* insert after command name */
 240                memcpy(new_argv + count, *argv + 1, sizeof(char*) * *argcp);
 241                new_argv[count+*argcp] = NULL;
 242
 243                *argv = new_argv;
 244                *argcp += count - 1;
 245
 246                ret = 1;
 247        }
 248
 249        if (subdir)
 250                chdir(subdir);
 251
 252        errno = saved_errno;
 253
 254        return ret;
 255}
 256
 257const char git_version_string[] = GIT_VERSION;
 258
 259#define RUN_SETUP       (1<<0)
 260#define USE_PAGER       (1<<1)
 261/*
 262 * require working tree to be present -- anything uses this needs
 263 * RUN_SETUP for reading from the configuration file.
 264 */
 265#define NEED_WORK_TREE  (1<<2)
 266
 267struct cmd_struct {
 268        const char *cmd;
 269        int (*fn)(int, const char **, const char *);
 270        int option;
 271};
 272
 273static int run_command(struct cmd_struct *p, int argc, const char **argv)
 274{
 275        int status;
 276        struct stat st;
 277        const char *prefix;
 278
 279        prefix = NULL;
 280        if (p->option & RUN_SETUP)
 281                prefix = setup_git_directory();
 282
 283        if (use_pager == -1 && p->option & RUN_SETUP)
 284                use_pager = check_pager_config(p->cmd);
 285        if (use_pager == -1 && p->option & USE_PAGER)
 286                use_pager = 1;
 287        commit_pager_choice();
 288
 289        if (p->option & NEED_WORK_TREE)
 290                setup_work_tree();
 291
 292        trace_argv_printf(argv, "trace: built-in: git");
 293
 294        status = p->fn(argc, argv, prefix);
 295        if (status)
 296                return status & 0xff;
 297
 298        /* Somebody closed stdout? */
 299        if (fstat(fileno(stdout), &st))
 300                return 0;
 301        /* Ignore write errors for pipes and sockets.. */
 302        if (S_ISFIFO(st.st_mode) || S_ISSOCK(st.st_mode))
 303                return 0;
 304
 305        /* Check for ENOSPC and EIO errors.. */
 306        if (fflush(stdout))
 307                die("write failure on standard output: %s", strerror(errno));
 308        if (ferror(stdout))
 309                die("unknown write failure on standard output");
 310        if (fclose(stdout))
 311                die("close failed on standard output: %s", strerror(errno));
 312        return 0;
 313}
 314
 315static void handle_internal_command(int argc, const char **argv)
 316{
 317        const char *cmd = argv[0];
 318        static struct cmd_struct commands[] = {
 319                { "add", cmd_add, RUN_SETUP | NEED_WORK_TREE },
 320                { "annotate", cmd_annotate, RUN_SETUP },
 321                { "apply", cmd_apply },
 322                { "archive", cmd_archive },
 323                { "blame", cmd_blame, RUN_SETUP },
 324                { "branch", cmd_branch, RUN_SETUP },
 325                { "bundle", cmd_bundle },
 326                { "cat-file", cmd_cat_file, RUN_SETUP },
 327                { "checkout", cmd_checkout, RUN_SETUP | NEED_WORK_TREE },
 328                { "checkout-index", cmd_checkout_index,
 329                        RUN_SETUP | NEED_WORK_TREE},
 330                { "check-ref-format", cmd_check_ref_format },
 331                { "check-attr", cmd_check_attr, RUN_SETUP },
 332                { "cherry", cmd_cherry, RUN_SETUP },
 333                { "cherry-pick", cmd_cherry_pick, RUN_SETUP | NEED_WORK_TREE },
 334                { "clone", cmd_clone },
 335                { "clean", cmd_clean, RUN_SETUP | NEED_WORK_TREE },
 336                { "commit", cmd_commit, RUN_SETUP | NEED_WORK_TREE },
 337                { "commit-tree", cmd_commit_tree, RUN_SETUP },
 338                { "config", cmd_config },
 339                { "count-objects", cmd_count_objects, RUN_SETUP },
 340                { "describe", cmd_describe, RUN_SETUP },
 341                { "diff", cmd_diff },
 342                { "diff-files", cmd_diff_files, RUN_SETUP },
 343                { "diff-index", cmd_diff_index, RUN_SETUP },
 344                { "diff-tree", cmd_diff_tree, RUN_SETUP },
 345                { "fast-export", cmd_fast_export, RUN_SETUP },
 346                { "fetch", cmd_fetch, RUN_SETUP },
 347                { "fetch-pack", cmd_fetch_pack, RUN_SETUP },
 348                { "fetch--tool", cmd_fetch__tool, RUN_SETUP },
 349                { "fmt-merge-msg", cmd_fmt_merge_msg, RUN_SETUP },
 350                { "for-each-ref", cmd_for_each_ref, RUN_SETUP },
 351                { "format-patch", cmd_format_patch, RUN_SETUP },
 352                { "fsck", cmd_fsck, RUN_SETUP },
 353                { "fsck-objects", cmd_fsck, RUN_SETUP },
 354                { "gc", cmd_gc, RUN_SETUP },
 355                { "get-tar-commit-id", cmd_get_tar_commit_id },
 356                { "grep", cmd_grep, RUN_SETUP | USE_PAGER },
 357                { "help", cmd_help },
 358#ifndef NO_CURL
 359                { "http-fetch", cmd_http_fetch, RUN_SETUP },
 360#endif
 361                { "init", cmd_init_db },
 362                { "init-db", cmd_init_db },
 363                { "log", cmd_log, RUN_SETUP | USE_PAGER },
 364                { "ls-files", cmd_ls_files, RUN_SETUP },
 365                { "ls-tree", cmd_ls_tree, RUN_SETUP },
 366                { "ls-remote", cmd_ls_remote },
 367                { "mailinfo", cmd_mailinfo },
 368                { "mailsplit", cmd_mailsplit },
 369                { "merge-base", cmd_merge_base, RUN_SETUP },
 370                { "merge-file", cmd_merge_file },
 371                { "merge-ours", cmd_merge_ours, RUN_SETUP },
 372                { "merge-recursive", cmd_merge_recursive, RUN_SETUP | NEED_WORK_TREE },
 373                { "merge-subtree", cmd_merge_recursive, RUN_SETUP | NEED_WORK_TREE },
 374                { "mv", cmd_mv, RUN_SETUP | NEED_WORK_TREE },
 375                { "name-rev", cmd_name_rev, RUN_SETUP },
 376                { "pack-objects", cmd_pack_objects, RUN_SETUP },
 377                { "peek-remote", cmd_ls_remote },
 378                { "pickaxe", cmd_blame, RUN_SETUP },
 379                { "prune", cmd_prune, RUN_SETUP },
 380                { "prune-packed", cmd_prune_packed, RUN_SETUP },
 381                { "push", cmd_push, RUN_SETUP },
 382                { "read-tree", cmd_read_tree, RUN_SETUP },
 383                { "reflog", cmd_reflog, RUN_SETUP },
 384                { "remote", cmd_remote, RUN_SETUP },
 385                { "repo-config", cmd_config },
 386                { "rerere", cmd_rerere, RUN_SETUP },
 387                { "reset", cmd_reset, RUN_SETUP },
 388                { "rev-list", cmd_rev_list, RUN_SETUP },
 389                { "rev-parse", cmd_rev_parse },
 390                { "revert", cmd_revert, RUN_SETUP | NEED_WORK_TREE },
 391                { "rm", cmd_rm, RUN_SETUP },
 392                { "send-pack", cmd_send_pack, RUN_SETUP },
 393                { "shortlog", cmd_shortlog, USE_PAGER },
 394                { "show-branch", cmd_show_branch, RUN_SETUP },
 395                { "show", cmd_show, RUN_SETUP | USE_PAGER },
 396                { "status", cmd_status, RUN_SETUP | NEED_WORK_TREE | USE_PAGER },
 397                { "stripspace", cmd_stripspace },
 398                { "symbolic-ref", cmd_symbolic_ref, RUN_SETUP },
 399                { "tag", cmd_tag, RUN_SETUP },
 400                { "tar-tree", cmd_tar_tree },
 401                { "unpack-objects", cmd_unpack_objects, RUN_SETUP },
 402                { "update-index", cmd_update_index, RUN_SETUP },
 403                { "update-ref", cmd_update_ref, RUN_SETUP },
 404                { "upload-archive", cmd_upload_archive },
 405                { "verify-tag", cmd_verify_tag, RUN_SETUP },
 406                { "version", cmd_version },
 407                { "whatchanged", cmd_whatchanged, RUN_SETUP | USE_PAGER },
 408                { "write-tree", cmd_write_tree, RUN_SETUP },
 409                { "verify-pack", cmd_verify_pack },
 410                { "show-ref", cmd_show_ref, RUN_SETUP },
 411                { "pack-refs", cmd_pack_refs, RUN_SETUP },
 412        };
 413        int i;
 414        static const char ext[] = STRIP_EXTENSION;
 415
 416        if (sizeof(ext) > 1) {
 417                i = strlen(argv[0]) - strlen(ext);
 418                if (i > 0 && !strcmp(argv[0] + i, ext)) {
 419                        char *argv0 = strdup(argv[0]);
 420                        argv[0] = cmd = argv0;
 421                        argv0[i] = '\0';
 422                }
 423        }
 424
 425        /* Turn "git cmd --help" into "git help cmd" */
 426        if (argc > 1 && !strcmp(argv[1], "--help")) {
 427                argv[1] = argv[0];
 428                argv[0] = cmd = "help";
 429        }
 430
 431        for (i = 0; i < ARRAY_SIZE(commands); i++) {
 432                struct cmd_struct *p = commands+i;
 433                if (strcmp(p->cmd, cmd))
 434                        continue;
 435                exit(run_command(p, argc, argv));
 436        }
 437}
 438
 439static void execv_dashed_external(const char **argv)
 440{
 441        struct strbuf cmd;
 442        const char *tmp;
 443
 444        strbuf_init(&cmd, 0);
 445        strbuf_addf(&cmd, "git-%s", argv[0]);
 446
 447        /*
 448         * argv[0] must be the git command, but the argv array
 449         * belongs to the caller, and may be reused in
 450         * subsequent loop iterations. Save argv[0] and
 451         * restore it on error.
 452         */
 453        tmp = argv[0];
 454        argv[0] = cmd.buf;
 455
 456        trace_argv_printf(argv, "trace: exec:");
 457
 458        /* execvp() can only ever return if it fails */
 459        execvp(cmd.buf, (char **)argv);
 460
 461        trace_printf("trace: exec failed: %s\n", strerror(errno));
 462
 463        argv[0] = tmp;
 464
 465        strbuf_release(&cmd);
 466}
 467
 468
 469int main(int argc, const char **argv)
 470{
 471        const char *cmd = argv[0] && *argv[0] ? argv[0] : "git-help";
 472        char *slash = (char *)cmd + strlen(cmd);
 473        const char *cmd_path = NULL;
 474        int done_alias = 0;
 475
 476        /*
 477         * Take the basename of argv[0] as the command
 478         * name, and the dirname as the default exec_path
 479         * if we don't have anything better.
 480         */
 481        do
 482                --slash;
 483        while (cmd <= slash && !is_dir_sep(*slash));
 484        if (cmd <= slash) {
 485                *slash++ = 0;
 486                cmd_path = cmd;
 487                cmd = slash;
 488        }
 489
 490        /*
 491         * "git-xxxx" is the same as "git xxxx", but we obviously:
 492         *
 493         *  - cannot take flags in between the "git" and the "xxxx".
 494         *  - cannot execute it externally (since it would just do
 495         *    the same thing over again)
 496         *
 497         * So we just directly call the internal command handler, and
 498         * die if that one cannot handle it.
 499         */
 500        if (!prefixcmp(cmd, "git-")) {
 501                cmd += 4;
 502                argv[0] = cmd;
 503                handle_internal_command(argc, argv);
 504                die("cannot handle %s internally", cmd);
 505        }
 506
 507        /* Look for flags.. */
 508        argv++;
 509        argc--;
 510        handle_options(&argv, &argc, NULL);
 511        commit_pager_choice();
 512        if (argc > 0) {
 513                if (!prefixcmp(argv[0], "--"))
 514                        argv[0] += 2;
 515        } else {
 516                /* The user didn't specify a command; give them help */
 517                printf("usage: %s\n\n", git_usage_string);
 518                list_common_cmds_help();
 519                printf("\n%s\n", git_more_info_string);
 520                exit(1);
 521        }
 522        cmd = argv[0];
 523
 524        /*
 525         * We use PATH to find git commands, but we prepend some higher
 526         * precidence paths: the "--exec-path" option, the GIT_EXEC_PATH
 527         * environment, and the $(gitexecdir) from the Makefile at build
 528         * time.
 529         */
 530        setup_path(cmd_path);
 531
 532        while (1) {
 533                /* See if it's an internal command */
 534                handle_internal_command(argc, argv);
 535
 536                /* .. then try the external ones */
 537                execv_dashed_external(argv);
 538
 539                /* It could be an alias -- this works around the insanity
 540                 * of overriding "git log" with "git show" by having
 541                 * alias.log = show
 542                 */
 543                if (done_alias || !handle_alias(&argc, &argv))
 544                        break;
 545                done_alias = 1;
 546        }
 547
 548        if (errno == ENOENT) {
 549                if (done_alias) {
 550                        fprintf(stderr, "Expansion of alias '%s' failed; "
 551                                "'%s' is not a git-command\n",
 552                                cmd, argv[0]);
 553                        exit(1);
 554                }
 555                help_unknown_cmd(cmd);
 556        }
 557
 558        fprintf(stderr, "Failed to run command '%s': %s\n",
 559                cmd, strerror(errno));
 560
 561        return 1;
 562}