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