Andrew's git / gitweb.git / git.c
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git.con commit Update stale documentation link in the k.org site (326df26)
   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
   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, "--no-pager")) {
  62                        setenv("GIT_PAGER", "cat", 1);
  63                        if (envchanged)
  64                                *envchanged = 1;
  65                } else if (!strcmp(cmd, "--git-dir")) {
  66                        if (*argc < 2) {
  67                                fprintf(stderr, "No directory given for --git-dir.\n" );
  68                                usage(git_usage_string);
  69                        }
  70                        setenv(GIT_DIR_ENVIRONMENT, (*argv)[1], 1);
  71                        if (envchanged)
  72                                *envchanged = 1;
  73                        (*argv)++;
  74                        (*argc)--;
  75                        handled++;
  76                } else if (!prefixcmp(cmd, "--git-dir=")) {
  77                        setenv(GIT_DIR_ENVIRONMENT, cmd + 10, 1);
  78                        if (envchanged)
  79                                *envchanged = 1;
  80                } else if (!strcmp(cmd, "--work-tree")) {
  81                        if (*argc < 2) {
  82                                fprintf(stderr, "No directory given for --work-tree.\n" );
  83                                usage(git_usage_string);
  84                        }
  85                        setenv(GIT_WORK_TREE_ENVIRONMENT, (*argv)[1], 1);
  86                        if (envchanged)
  87                                *envchanged = 1;
  88                        (*argv)++;
  89                        (*argc)--;
  90                } else if (!prefixcmp(cmd, "--work-tree=")) {
  91                        setenv(GIT_WORK_TREE_ENVIRONMENT, cmd + 12, 1);
  92                        if (envchanged)
  93                                *envchanged = 1;
  94                } else if (!strcmp(cmd, "--bare")) {
  95                        static char git_dir[PATH_MAX+1];
  96                        is_bare_repository_cfg = 1;
  97                        setenv(GIT_DIR_ENVIRONMENT, getcwd(git_dir, sizeof(git_dir)), 0);
  98                        if (envchanged)
  99                                *envchanged = 1;
 100                } else {
 101                        fprintf(stderr, "Unknown option: %s\n", cmd);
 102                        usage(git_usage_string);
 103                }
 104
 105                (*argv)++;
 106                (*argc)--;
 107                handled++;
 108        }
 109        return handled;
 110}
 111
 112static const char *alias_command;
 113static char *alias_string;
 114
 115static int git_alias_config(const char *var, const char *value)
 116{
 117        if (!prefixcmp(var, "alias.") && !strcmp(var + 6, alias_command)) {
 118                alias_string = xstrdup(value);
 119        }
 120        return 0;
 121}
 122
 123static int split_cmdline(char *cmdline, const char ***argv)
 124{
 125        int src, dst, count = 0, size = 16;
 126        char quoted = 0;
 127
 128        *argv = xmalloc(sizeof(char*) * size);
 129
 130        /* split alias_string */
 131        (*argv)[count++] = cmdline;
 132        for (src = dst = 0; cmdline[src];) {
 133                char c = cmdline[src];
 134                if (!quoted && isspace(c)) {
 135                        cmdline[dst++] = 0;
 136                        while (cmdline[++src]
 137                                        && isspace(cmdline[src]))
 138                                ; /* skip */
 139                        if (count >= size) {
 140                                size += 16;
 141                                *argv = xrealloc(*argv, sizeof(char*) * size);
 142                        }
 143                        (*argv)[count++] = cmdline + dst;
 144                } else if(!quoted && (c == '\'' || c == '"')) {
 145                        quoted = c;
 146                        src++;
 147                } else if (c == quoted) {
 148                        quoted = 0;
 149                        src++;
 150                } else {
 151                        if (c == '\\' && quoted != '\'') {
 152                                src++;
 153                                c = cmdline[src];
 154                                if (!c) {
 155                                        free(*argv);
 156                                        *argv = NULL;
 157                                        return error("cmdline ends with \\");
 158                                }
 159                        }
 160                        cmdline[dst++] = c;
 161                        src++;
 162                }
 163        }
 164
 165        cmdline[dst] = 0;
 166
 167        if (quoted) {
 168                free(*argv);
 169                *argv = NULL;
 170                return error("unclosed quote");
 171        }
 172
 173        return count;
 174}
 175
 176static int handle_alias(int *argcp, const char ***argv)
 177{
 178        int nongit = 0, envchanged = 0, ret = 0, saved_errno = errno;
 179        const char *subdir;
 180        int count, option_count;
 181        const char** new_argv;
 182
 183        subdir = setup_git_directory_gently(&nongit);
 184
 185        alias_command = (*argv)[0];
 186        git_config(git_alias_config);
 187        if (alias_string) {
 188                if (alias_string[0] == '!') {
 189                        if (*argcp > 1) {
 190                                int i, sz = PATH_MAX;
 191                                char *s = xmalloc(sz), *new_alias = s;
 192
 193                                add_to_string(&s, &sz, alias_string, 0);
 194                                free(alias_string);
 195                                alias_string = new_alias;
 196                                for (i = 1; i < *argcp &&
 197                                        !add_to_string(&s, &sz, " ", 0) &&
 198                                        !add_to_string(&s, &sz, (*argv)[i], 1)
 199                                        ; i++)
 200                                        ; /* do nothing */
 201                                if (!sz)
 202                                        die("Too many or long arguments");
 203                        }
 204                        trace_printf("trace: alias to shell cmd: %s => %s\n",
 205                                     alias_command, alias_string + 1);
 206                        ret = system(alias_string + 1);
 207                        if (ret >= 0 && WIFEXITED(ret) &&
 208                            WEXITSTATUS(ret) != 127)
 209                                exit(WEXITSTATUS(ret));
 210                        die("Failed to run '%s' when expanding alias '%s'\n",
 211                            alias_string + 1, alias_command);
 212                }
 213                count = split_cmdline(alias_string, &new_argv);
 214                option_count = handle_options(&new_argv, &count, &envchanged);
 215                if (envchanged)
 216                        die("alias '%s' changes environment variables\n"
 217                                 "You can use '!git' in the alias to do this.",
 218                                 alias_command);
 219                memmove(new_argv - option_count, new_argv,
 220                                count * sizeof(char *));
 221                new_argv -= option_count;
 222
 223                if (count < 1)
 224                        die("empty alias for %s", alias_command);
 225
 226                if (!strcmp(alias_command, new_argv[0]))
 227                        die("recursive alias: %s", alias_command);
 228
 229                trace_argv_printf(new_argv, count,
 230                                  "trace: alias expansion: %s =>",
 231                                  alias_command);
 232
 233                new_argv = xrealloc(new_argv, sizeof(char*) *
 234                                    (count + *argcp + 1));
 235                /* insert after command name */
 236                memcpy(new_argv + count, *argv + 1, sizeof(char*) * *argcp);
 237                new_argv[count+*argcp] = NULL;
 238
 239                *argv = new_argv;
 240                *argcp += count - 1;
 241
 242                ret = 1;
 243        }
 244
 245        if (subdir)
 246                chdir(subdir);
 247
 248        errno = saved_errno;
 249
 250        return ret;
 251}
 252
 253const char git_version_string[] = GIT_VERSION;
 254
 255#define RUN_SETUP       (1<<0)
 256#define USE_PAGER       (1<<1)
 257/*
 258 * require working tree to be present -- anything uses this needs
 259 * RUN_SETUP for reading from the configuration file.
 260 */
 261#define NEED_WORK_TREE  (1<<2)
 262
 263struct cmd_struct {
 264        const char *cmd;
 265        int (*fn)(int, const char **, const char *);
 266        int option;
 267};
 268
 269static int run_command(struct cmd_struct *p, int argc, const char **argv)
 270{
 271        int status;
 272        struct stat st;
 273        const char *prefix;
 274
 275        prefix = NULL;
 276        if (p->option & RUN_SETUP)
 277                prefix = setup_git_directory();
 278        if (p->option & USE_PAGER)
 279                setup_pager();
 280        if (p->option & NEED_WORK_TREE) {
 281                const char *work_tree = get_git_work_tree();
 282                const char *git_dir = get_git_dir();
 283                if (!is_absolute_path(git_dir))
 284                        set_git_dir(make_absolute_path(git_dir));
 285                if (!work_tree || chdir(work_tree))
 286                        die("%s must be run in a work tree", p->cmd);
 287        }
 288        trace_argv_printf(argv, argc, "trace: built-in: git");
 289
 290        status = p->fn(argc, argv, prefix);
 291        if (status)
 292                return status;
 293
 294        /* Somebody closed stdout? */
 295        if (fstat(fileno(stdout), &st))
 296                return 0;
 297        /* Ignore write errors for pipes and sockets.. */
 298        if (S_ISFIFO(st.st_mode) || S_ISSOCK(st.st_mode))
 299                return 0;
 300
 301        /* Check for ENOSPC and EIO errors.. */
 302        if (fflush(stdout))
 303                die("write failure on standard output: %s", strerror(errno));
 304        if (ferror(stdout))
 305                die("unknown write failure on standard output");
 306        if (fclose(stdout))
 307                die("close failed on standard output: %s", strerror(errno));
 308        return 0;
 309}
 310
 311static void handle_internal_command(int argc, const char **argv)
 312{
 313        const char *cmd = argv[0];
 314        static struct cmd_struct commands[] = {
 315                { "add", cmd_add, RUN_SETUP | NEED_WORK_TREE },
 316                { "annotate", cmd_annotate, RUN_SETUP },
 317                { "apply", cmd_apply },
 318                { "archive", cmd_archive },
 319                { "blame", cmd_blame, RUN_SETUP },
 320                { "branch", cmd_branch, RUN_SETUP },
 321                { "bundle", cmd_bundle },
 322                { "cat-file", cmd_cat_file, RUN_SETUP },
 323                { "checkout-index", cmd_checkout_index,
 324                        RUN_SETUP | NEED_WORK_TREE},
 325                { "check-ref-format", cmd_check_ref_format },
 326                { "check-attr", cmd_check_attr, RUN_SETUP | NEED_WORK_TREE },
 327                { "cherry", cmd_cherry, RUN_SETUP },
 328                { "cherry-pick", cmd_cherry_pick, RUN_SETUP | NEED_WORK_TREE },
 329                { "commit-tree", cmd_commit_tree, RUN_SETUP },
 330                { "config", cmd_config },
 331                { "count-objects", cmd_count_objects, RUN_SETUP },
 332                { "describe", cmd_describe, RUN_SETUP },
 333                { "diff", cmd_diff },
 334                { "diff-files", cmd_diff_files },
 335                { "diff-index", cmd_diff_index, RUN_SETUP },
 336                { "diff-tree", cmd_diff_tree, RUN_SETUP },
 337                { "fetch--tool", cmd_fetch__tool, RUN_SETUP },
 338                { "fmt-merge-msg", cmd_fmt_merge_msg, RUN_SETUP },
 339                { "for-each-ref", cmd_for_each_ref, RUN_SETUP },
 340                { "format-patch", cmd_format_patch, RUN_SETUP },
 341                { "fsck", cmd_fsck, RUN_SETUP },
 342                { "fsck-objects", cmd_fsck, RUN_SETUP },
 343                { "gc", cmd_gc, RUN_SETUP },
 344                { "get-tar-commit-id", cmd_get_tar_commit_id },
 345                { "grep", cmd_grep, RUN_SETUP | USE_PAGER },
 346                { "help", cmd_help },
 347                { "init", cmd_init_db },
 348                { "init-db", cmd_init_db },
 349                { "log", cmd_log, RUN_SETUP | USE_PAGER },
 350                { "ls-files", cmd_ls_files, RUN_SETUP },
 351                { "ls-tree", cmd_ls_tree, RUN_SETUP },
 352                { "mailinfo", cmd_mailinfo },
 353                { "mailsplit", cmd_mailsplit },
 354                { "merge-base", cmd_merge_base, RUN_SETUP },
 355                { "merge-file", cmd_merge_file },
 356                { "mv", cmd_mv, RUN_SETUP | NEED_WORK_TREE },
 357                { "name-rev", cmd_name_rev, RUN_SETUP },
 358                { "pack-objects", cmd_pack_objects, RUN_SETUP },
 359                { "pickaxe", cmd_blame, RUN_SETUP },
 360                { "prune", cmd_prune, RUN_SETUP },
 361                { "prune-packed", cmd_prune_packed, RUN_SETUP },
 362                { "push", cmd_push, RUN_SETUP },
 363                { "read-tree", cmd_read_tree, RUN_SETUP },
 364                { "reflog", cmd_reflog, RUN_SETUP },
 365                { "repo-config", cmd_config },
 366                { "rerere", cmd_rerere, RUN_SETUP },
 367                { "reset", cmd_reset, RUN_SETUP },
 368                { "rev-list", cmd_rev_list, RUN_SETUP },
 369                { "rev-parse", cmd_rev_parse, RUN_SETUP },
 370                { "revert", cmd_revert, RUN_SETUP | NEED_WORK_TREE },
 371                { "rm", cmd_rm, RUN_SETUP | NEED_WORK_TREE },
 372                { "runstatus", cmd_runstatus, RUN_SETUP | NEED_WORK_TREE },
 373                { "shortlog", cmd_shortlog, RUN_SETUP | USE_PAGER },
 374                { "show-branch", cmd_show_branch, RUN_SETUP },
 375                { "show", cmd_show, RUN_SETUP | USE_PAGER },
 376                { "stripspace", cmd_stripspace },
 377                { "symbolic-ref", cmd_symbolic_ref, RUN_SETUP },
 378                { "tag", cmd_tag, RUN_SETUP },
 379                { "tar-tree", cmd_tar_tree },
 380                { "unpack-objects", cmd_unpack_objects, RUN_SETUP },
 381                { "update-index", cmd_update_index, RUN_SETUP },
 382                { "update-ref", cmd_update_ref, RUN_SETUP },
 383                { "upload-archive", cmd_upload_archive },
 384                { "verify-tag", cmd_verify_tag, RUN_SETUP },
 385                { "version", cmd_version },
 386                { "whatchanged", cmd_whatchanged, RUN_SETUP | USE_PAGER },
 387                { "write-tree", cmd_write_tree, RUN_SETUP },
 388                { "verify-pack", cmd_verify_pack },
 389                { "show-ref", cmd_show_ref, RUN_SETUP },
 390                { "pack-refs", cmd_pack_refs, RUN_SETUP },
 391        };
 392        int i;
 393
 394        /* Turn "git cmd --help" into "git help cmd" */
 395        if (argc > 1 && !strcmp(argv[1], "--help")) {
 396                argv[1] = argv[0];
 397                argv[0] = cmd = "help";
 398        }
 399
 400        for (i = 0; i < ARRAY_SIZE(commands); i++) {
 401                struct cmd_struct *p = commands+i;
 402                if (strcmp(p->cmd, cmd))
 403                        continue;
 404                exit(run_command(p, argc, argv));
 405        }
 406}
 407
 408int main(int argc, const char **argv)
 409{
 410        const char *cmd = argv[0] ? argv[0] : "git-help";
 411        char *slash = strrchr(cmd, '/');
 412        const char *exec_path = NULL;
 413        int done_alias = 0;
 414
 415        /*
 416         * Take the basename of argv[0] as the command
 417         * name, and the dirname as the default exec_path
 418         * if it's an absolute path and we don't have
 419         * anything better.
 420         */
 421        if (slash) {
 422                *slash++ = 0;
 423                if (*cmd == '/')
 424                        exec_path = cmd;
 425                cmd = slash;
 426        }
 427
 428        /*
 429         * "git-xxxx" is the same as "git xxxx", but we obviously:
 430         *
 431         *  - cannot take flags in between the "git" and the "xxxx".
 432         *  - cannot execute it externally (since it would just do
 433         *    the same thing over again)
 434         *
 435         * So we just directly call the internal command handler, and
 436         * die if that one cannot handle it.
 437         */
 438        if (!prefixcmp(cmd, "git-")) {
 439                cmd += 4;
 440                argv[0] = cmd;
 441                handle_internal_command(argc, argv);
 442                die("cannot handle %s internally", cmd);
 443        }
 444
 445        /* Look for flags.. */
 446        argv++;
 447        argc--;
 448        handle_options(&argv, &argc, NULL);
 449        if (argc > 0) {
 450                if (!prefixcmp(argv[0], "--"))
 451                        argv[0] += 2;
 452        } else {
 453                /* Default command: "help" */
 454                argv[0] = "help";
 455                argc = 1;
 456        }
 457        cmd = argv[0];
 458
 459        /*
 460         * We execute external git command via execv_git_cmd(),
 461         * which looks at "--exec-path" option, GIT_EXEC_PATH
 462         * environment, and $(gitexecdir) in Makefile while built,
 463         * in this order.  For scripted commands, we prepend
 464         * the value of the exec_path variable to the PATH.
 465         */
 466        if (exec_path)
 467                prepend_to_path(exec_path, strlen(exec_path));
 468        exec_path = git_exec_path();
 469        prepend_to_path(exec_path, strlen(exec_path));
 470
 471        while (1) {
 472                /* See if it's an internal command */
 473                handle_internal_command(argc, argv);
 474
 475                /* .. then try the external ones */
 476                execv_git_cmd(argv);
 477
 478                /* It could be an alias -- this works around the insanity
 479                 * of overriding "git log" with "git show" by having
 480                 * alias.log = show
 481                 */
 482                if (done_alias || !handle_alias(&argc, &argv))
 483                        break;
 484                done_alias = 1;
 485        }
 486
 487        if (errno == ENOENT) {
 488                if (done_alias) {
 489                        fprintf(stderr, "Expansion of alias '%s' failed; "
 490                                "'%s' is not a git-command\n",
 491                                cmd, argv[0]);
 492                        exit(1);
 493                }
 494                help_unknown_cmd(cmd);
 495        }
 496
 497        fprintf(stderr, "Failed to run command '%s': %s\n",
 498                cmd, strerror(errno));
 499
 500        return 1;
 501}