Andrew's git / gitweb.git / git.c
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git.con commit Documentation: mention ORIG_HEAD in am, merge, and rebase (9869099)
   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 handle_options(const char*** argv, int* argc, int* envchanged)
  13{
  14        int handled = 0;
  15
  16        while (*argc > 0) {
  17                const char *cmd = (*argv)[0];
  18                if (cmd[0] != '-')
  19                        break;
  20
  21                /*
  22                 * For legacy reasons, the "version" and "help"
  23                 * commands can be written with "--" prepended
  24                 * to make them look like flags.
  25                 */
  26                if (!strcmp(cmd, "--help") || !strcmp(cmd, "--version"))
  27                        break;
  28
  29                /*
  30                 * Check remaining flags.
  31                 */
  32                if (!prefixcmp(cmd, "--exec-path")) {
  33                        cmd += 11;
  34                        if (*cmd == '=')
  35                                git_set_argv_exec_path(cmd + 1);
  36                        else {
  37                                puts(git_exec_path());
  38                                exit(0);
  39                        }
  40                } else if (!strcmp(cmd, "-p") || !strcmp(cmd, "--paginate")) {
  41                        setup_pager();
  42                } else if (!strcmp(cmd, "--no-pager")) {
  43                        setenv("GIT_PAGER", "cat", 1);
  44                        if (envchanged)
  45                                *envchanged = 1;
  46                } else if (!strcmp(cmd, "--git-dir")) {
  47                        if (*argc < 2) {
  48                                fprintf(stderr, "No directory given for --git-dir.\n" );
  49                                usage(git_usage_string);
  50                        }
  51                        setenv(GIT_DIR_ENVIRONMENT, (*argv)[1], 1);
  52                        if (envchanged)
  53                                *envchanged = 1;
  54                        (*argv)++;
  55                        (*argc)--;
  56                        handled++;
  57                } else if (!prefixcmp(cmd, "--git-dir=")) {
  58                        setenv(GIT_DIR_ENVIRONMENT, cmd + 10, 1);
  59                        if (envchanged)
  60                                *envchanged = 1;
  61                } else if (!strcmp(cmd, "--work-tree")) {
  62                        if (*argc < 2) {
  63                                fprintf(stderr, "No directory given for --work-tree.\n" );
  64                                usage(git_usage_string);
  65                        }
  66                        setenv(GIT_WORK_TREE_ENVIRONMENT, (*argv)[1], 1);
  67                        if (envchanged)
  68                                *envchanged = 1;
  69                        (*argv)++;
  70                        (*argc)--;
  71                } else if (!prefixcmp(cmd, "--work-tree=")) {
  72                        setenv(GIT_WORK_TREE_ENVIRONMENT, cmd + 12, 1);
  73                        if (envchanged)
  74                                *envchanged = 1;
  75                } else if (!strcmp(cmd, "--bare")) {
  76                        static char git_dir[PATH_MAX+1];
  77                        is_bare_repository_cfg = 1;
  78                        setenv(GIT_DIR_ENVIRONMENT, getcwd(git_dir, sizeof(git_dir)), 0);
  79                        if (envchanged)
  80                                *envchanged = 1;
  81                } else {
  82                        fprintf(stderr, "Unknown option: %s\n", cmd);
  83                        usage(git_usage_string);
  84                }
  85
  86                (*argv)++;
  87                (*argc)--;
  88                handled++;
  89        }
  90        return handled;
  91}
  92
  93static int split_cmdline(char *cmdline, const char ***argv)
  94{
  95        int src, dst, count = 0, size = 16;
  96        char quoted = 0;
  97
  98        *argv = xmalloc(sizeof(char*) * size);
  99
 100        /* split alias_string */
 101        (*argv)[count++] = cmdline;
 102        for (src = dst = 0; cmdline[src];) {
 103                char c = cmdline[src];
 104                if (!quoted && isspace(c)) {
 105                        cmdline[dst++] = 0;
 106                        while (cmdline[++src]
 107                                        && isspace(cmdline[src]))
 108                                ; /* skip */
 109                        if (count >= size) {
 110                                size += 16;
 111                                *argv = xrealloc(*argv, sizeof(char*) * size);
 112                        }
 113                        (*argv)[count++] = cmdline + dst;
 114                } else if(!quoted && (c == '\'' || c == '"')) {
 115                        quoted = c;
 116                        src++;
 117                } else if (c == quoted) {
 118                        quoted = 0;
 119                        src++;
 120                } else {
 121                        if (c == '\\' && quoted != '\'') {
 122                                src++;
 123                                c = cmdline[src];
 124                                if (!c) {
 125                                        free(*argv);
 126                                        *argv = NULL;
 127                                        return error("cmdline ends with \\");
 128                                }
 129                        }
 130                        cmdline[dst++] = c;
 131                        src++;
 132                }
 133        }
 134
 135        cmdline[dst] = 0;
 136
 137        if (quoted) {
 138                free(*argv);
 139                *argv = NULL;
 140                return error("unclosed quote");
 141        }
 142
 143        return count;
 144}
 145
 146static int handle_alias(int *argcp, const char ***argv)
 147{
 148        int envchanged = 0, ret = 0, saved_errno = errno;
 149        const char *subdir;
 150        int count, option_count;
 151        const char** new_argv;
 152        const char *alias_command;
 153        char *alias_string;
 154        int unused_nongit;
 155
 156        subdir = setup_git_directory_gently(&unused_nongit);
 157
 158        alias_command = (*argv)[0];
 159        alias_string = alias_lookup(alias_command);
 160        if (alias_string) {
 161                if (alias_string[0] == '!') {
 162                        if (*argcp > 1) {
 163                                struct strbuf buf;
 164
 165                                strbuf_init(&buf, PATH_MAX);
 166                                strbuf_addstr(&buf, alias_string);
 167                                sq_quote_argv(&buf, (*argv) + 1, PATH_MAX);
 168                                free(alias_string);
 169                                alias_string = buf.buf;
 170                        }
 171                        trace_printf("trace: alias to shell cmd: %s => %s\n",
 172                                     alias_command, alias_string + 1);
 173                        ret = system(alias_string + 1);
 174                        if (ret >= 0 && WIFEXITED(ret) &&
 175                            WEXITSTATUS(ret) != 127)
 176                                exit(WEXITSTATUS(ret));
 177                        die("Failed to run '%s' when expanding alias '%s'\n",
 178                            alias_string + 1, alias_command);
 179                }
 180                count = split_cmdline(alias_string, &new_argv);
 181                option_count = handle_options(&new_argv, &count, &envchanged);
 182                if (envchanged)
 183                        die("alias '%s' changes environment variables\n"
 184                                 "You can use '!git' in the alias to do this.",
 185                                 alias_command);
 186                memmove(new_argv - option_count, new_argv,
 187                                count * sizeof(char *));
 188                new_argv -= option_count;
 189
 190                if (count < 1)
 191                        die("empty alias for %s", alias_command);
 192
 193                if (!strcmp(alias_command, new_argv[0]))
 194                        die("recursive alias: %s", alias_command);
 195
 196                trace_argv_printf(new_argv,
 197                                  "trace: alias expansion: %s =>",
 198                                  alias_command);
 199
 200                new_argv = xrealloc(new_argv, sizeof(char*) *
 201                                    (count + *argcp + 1));
 202                /* insert after command name */
 203                memcpy(new_argv + count, *argv + 1, sizeof(char*) * *argcp);
 204                new_argv[count+*argcp] = NULL;
 205
 206                *argv = new_argv;
 207                *argcp += count - 1;
 208
 209                ret = 1;
 210        }
 211
 212        if (subdir)
 213                chdir(subdir);
 214
 215        errno = saved_errno;
 216
 217        return ret;
 218}
 219
 220const char git_version_string[] = GIT_VERSION;
 221
 222#define RUN_SETUP       (1<<0)
 223#define USE_PAGER       (1<<1)
 224/*
 225 * require working tree to be present -- anything uses this needs
 226 * RUN_SETUP for reading from the configuration file.
 227 */
 228#define NEED_WORK_TREE  (1<<2)
 229
 230struct cmd_struct {
 231        const char *cmd;
 232        int (*fn)(int, const char **, const char *);
 233        int option;
 234};
 235
 236static int run_command(struct cmd_struct *p, int argc, const char **argv)
 237{
 238        int status;
 239        struct stat st;
 240        const char *prefix;
 241
 242        prefix = NULL;
 243        if (p->option & RUN_SETUP)
 244                prefix = setup_git_directory();
 245        if (p->option & USE_PAGER)
 246                setup_pager();
 247        if (p->option & NEED_WORK_TREE)
 248                setup_work_tree();
 249
 250        trace_argv_printf(argv, "trace: built-in: git");
 251
 252        status = p->fn(argc, argv, prefix);
 253        if (status)
 254                return status & 0xff;
 255
 256        /* Somebody closed stdout? */
 257        if (fstat(fileno(stdout), &st))
 258                return 0;
 259        /* Ignore write errors for pipes and sockets.. */
 260        if (S_ISFIFO(st.st_mode) || S_ISSOCK(st.st_mode))
 261                return 0;
 262
 263        /* Check for ENOSPC and EIO errors.. */
 264        if (fflush(stdout))
 265                die("write failure on standard output: %s", strerror(errno));
 266        if (ferror(stdout))
 267                die("unknown write failure on standard output");
 268        if (fclose(stdout))
 269                die("close failed on standard output: %s", strerror(errno));
 270        return 0;
 271}
 272
 273static void handle_internal_command(int argc, const char **argv)
 274{
 275        const char *cmd = argv[0];
 276        static struct cmd_struct commands[] = {
 277                { "add", cmd_add, RUN_SETUP | NEED_WORK_TREE },
 278                { "annotate", cmd_annotate, RUN_SETUP },
 279                { "apply", cmd_apply },
 280                { "archive", cmd_archive },
 281                { "blame", cmd_blame, RUN_SETUP },
 282                { "branch", cmd_branch, RUN_SETUP },
 283                { "bundle", cmd_bundle },
 284                { "cat-file", cmd_cat_file, RUN_SETUP },
 285                { "checkout", cmd_checkout, RUN_SETUP | NEED_WORK_TREE },
 286                { "checkout-index", cmd_checkout_index,
 287                        RUN_SETUP | NEED_WORK_TREE},
 288                { "check-ref-format", cmd_check_ref_format },
 289                { "check-attr", cmd_check_attr, RUN_SETUP },
 290                { "cherry", cmd_cherry, RUN_SETUP },
 291                { "cherry-pick", cmd_cherry_pick, RUN_SETUP | NEED_WORK_TREE },
 292                { "clone", cmd_clone },
 293                { "clean", cmd_clean, RUN_SETUP | NEED_WORK_TREE },
 294                { "commit", cmd_commit, RUN_SETUP | NEED_WORK_TREE },
 295                { "commit-tree", cmd_commit_tree, RUN_SETUP },
 296                { "config", cmd_config },
 297                { "count-objects", cmd_count_objects, RUN_SETUP },
 298                { "describe", cmd_describe, RUN_SETUP },
 299                { "diff", cmd_diff },
 300                { "diff-files", cmd_diff_files, RUN_SETUP },
 301                { "diff-index", cmd_diff_index, RUN_SETUP },
 302                { "diff-tree", cmd_diff_tree, RUN_SETUP },
 303                { "fast-export", cmd_fast_export, RUN_SETUP },
 304                { "fetch", cmd_fetch, RUN_SETUP },
 305                { "fetch-pack", cmd_fetch_pack, RUN_SETUP },
 306                { "fetch--tool", cmd_fetch__tool, RUN_SETUP },
 307                { "fmt-merge-msg", cmd_fmt_merge_msg, RUN_SETUP },
 308                { "for-each-ref", cmd_for_each_ref, RUN_SETUP },
 309                { "format-patch", cmd_format_patch, RUN_SETUP },
 310                { "fsck", cmd_fsck, RUN_SETUP },
 311                { "fsck-objects", cmd_fsck, RUN_SETUP },
 312                { "gc", cmd_gc, RUN_SETUP },
 313                { "get-tar-commit-id", cmd_get_tar_commit_id },
 314                { "grep", cmd_grep, RUN_SETUP | USE_PAGER },
 315                { "help", cmd_help },
 316#ifndef NO_CURL
 317                { "http-fetch", cmd_http_fetch, RUN_SETUP },
 318#endif
 319                { "init", cmd_init_db },
 320                { "init-db", cmd_init_db },
 321                { "log", cmd_log, RUN_SETUP | USE_PAGER },
 322                { "ls-files", cmd_ls_files, RUN_SETUP },
 323                { "ls-tree", cmd_ls_tree, RUN_SETUP },
 324                { "ls-remote", cmd_ls_remote },
 325                { "mailinfo", cmd_mailinfo },
 326                { "mailsplit", cmd_mailsplit },
 327                { "merge-base", cmd_merge_base, RUN_SETUP },
 328                { "merge-file", cmd_merge_file },
 329                { "merge-ours", cmd_merge_ours, RUN_SETUP },
 330                { "merge-recursive", cmd_merge_recursive, RUN_SETUP | NEED_WORK_TREE },
 331                { "merge-subtree", cmd_merge_recursive, RUN_SETUP | NEED_WORK_TREE },
 332                { "mv", cmd_mv, RUN_SETUP | NEED_WORK_TREE },
 333                { "name-rev", cmd_name_rev, RUN_SETUP },
 334                { "pack-objects", cmd_pack_objects, RUN_SETUP },
 335                { "peek-remote", cmd_ls_remote },
 336                { "pickaxe", cmd_blame, RUN_SETUP },
 337                { "prune", cmd_prune, RUN_SETUP },
 338                { "prune-packed", cmd_prune_packed, RUN_SETUP },
 339                { "push", cmd_push, RUN_SETUP },
 340                { "read-tree", cmd_read_tree, RUN_SETUP },
 341                { "reflog", cmd_reflog, RUN_SETUP },
 342                { "remote", cmd_remote, 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 | USE_PAGER },
 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                { "upload-archive", cmd_upload_archive },
 363                { "verify-tag", cmd_verify_tag, RUN_SETUP },
 364                { "version", cmd_version },
 365                { "whatchanged", cmd_whatchanged, RUN_SETUP | USE_PAGER },
 366                { "write-tree", cmd_write_tree, RUN_SETUP },
 367                { "verify-pack", cmd_verify_pack },
 368                { "show-ref", cmd_show_ref, RUN_SETUP },
 369                { "pack-refs", cmd_pack_refs, RUN_SETUP },
 370        };
 371        int i;
 372        static const char ext[] = STRIP_EXTENSION;
 373
 374        if (sizeof(ext) > 1) {
 375                i = strlen(argv[0]) - strlen(ext);
 376                if (i > 0 && !strcmp(argv[0] + i, ext)) {
 377                        char *argv0 = strdup(argv[0]);
 378                        argv[0] = cmd = argv0;
 379                        argv0[i] = '\0';
 380                }
 381        }
 382
 383        /* Turn "git cmd --help" into "git help cmd" */
 384        if (argc > 1 && !strcmp(argv[1], "--help")) {
 385                argv[1] = argv[0];
 386                argv[0] = cmd = "help";
 387        }
 388
 389        for (i = 0; i < ARRAY_SIZE(commands); i++) {
 390                struct cmd_struct *p = commands+i;
 391                if (strcmp(p->cmd, cmd))
 392                        continue;
 393                exit(run_command(p, argc, argv));
 394        }
 395}
 396
 397static void execv_dashed_external(const char **argv)
 398{
 399        struct strbuf cmd;
 400        const char *tmp;
 401
 402        strbuf_init(&cmd, 0);
 403        strbuf_addf(&cmd, "git-%s", argv[0]);
 404
 405        /*
 406         * argv[0] must be the git command, but the argv array
 407         * belongs to the caller, and may be reused in
 408         * subsequent loop iterations. Save argv[0] and
 409         * restore it on error.
 410         */
 411        tmp = argv[0];
 412        argv[0] = cmd.buf;
 413
 414        trace_argv_printf(argv, "trace: exec:");
 415
 416        /* execvp() can only ever return if it fails */
 417        execvp(cmd.buf, (char **)argv);
 418
 419        trace_printf("trace: exec failed: %s\n", strerror(errno));
 420
 421        argv[0] = tmp;
 422
 423        strbuf_release(&cmd);
 424}
 425
 426
 427int main(int argc, const char **argv)
 428{
 429        const char *cmd = argv[0] && *argv[0] ? argv[0] : "git-help";
 430        char *slash = (char *)cmd + strlen(cmd);
 431        const char *cmd_path = NULL;
 432        int done_alias = 0;
 433
 434        /*
 435         * Take the basename of argv[0] as the command
 436         * name, and the dirname as the default exec_path
 437         * if we don't have anything better.
 438         */
 439        do
 440                --slash;
 441        while (cmd <= slash && !is_dir_sep(*slash));
 442        if (cmd <= slash) {
 443                *slash++ = 0;
 444                cmd_path = cmd;
 445                cmd = slash;
 446        }
 447
 448        /*
 449         * "git-xxxx" is the same as "git xxxx", but we obviously:
 450         *
 451         *  - cannot take flags in between the "git" and the "xxxx".
 452         *  - cannot execute it externally (since it would just do
 453         *    the same thing over again)
 454         *
 455         * So we just directly call the internal command handler, and
 456         * die if that one cannot handle it.
 457         */
 458        if (!prefixcmp(cmd, "git-")) {
 459                cmd += 4;
 460                argv[0] = cmd;
 461                handle_internal_command(argc, argv);
 462                die("cannot handle %s internally", cmd);
 463        }
 464
 465        /* Look for flags.. */
 466        argv++;
 467        argc--;
 468        handle_options(&argv, &argc, NULL);
 469        if (argc > 0) {
 470                if (!prefixcmp(argv[0], "--"))
 471                        argv[0] += 2;
 472        } else {
 473                /* The user didn't specify a command; give them help */
 474                printf("usage: %s\n\n", git_usage_string);
 475                list_common_cmds_help();
 476                printf("\n%s\n", git_more_info_string);
 477                exit(1);
 478        }
 479        cmd = argv[0];
 480
 481        /*
 482         * We use PATH to find git commands, but we prepend some higher
 483         * precidence paths: the "--exec-path" option, the GIT_EXEC_PATH
 484         * environment, and the $(gitexecdir) from the Makefile at build
 485         * time.
 486         */
 487        setup_path(cmd_path);
 488
 489        while (1) {
 490                /* See if it's an internal command */
 491                handle_internal_command(argc, argv);
 492
 493                /* .. then try the external ones */
 494                execv_dashed_external(argv);
 495
 496                /* It could be an alias -- this works around the insanity
 497                 * of overriding "git log" with "git show" by having
 498                 * alias.log = show
 499                 */
 500                if (done_alias || !handle_alias(&argc, &argv))
 501                        break;
 502                done_alias = 1;
 503        }
 504
 505        if (errno == ENOENT) {
 506                if (done_alias) {
 507                        fprintf(stderr, "Expansion of alias '%s' failed; "
 508                                "'%s' is not a git-command\n",
 509                                cmd, argv[0]);
 510                        exit(1);
 511                }
 512                help_unknown_cmd(cmd);
 513        }
 514
 515        fprintf(stderr, "Failed to run command '%s': %s\n",
 516                cmd, strerror(errno));
 517
 518        return 1;
 519}