Andrew's git - gitweb.git/blob

911fd3dabb7bca08365e9dd68a5b52bcb7bdbe6d
   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] [--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)
  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                        (*argv)++;
  68                        (*argc)--;
  69                        handled++;
  70                } else if (!prefixcmp(cmd, "--git-dir=")) {
  71                        setenv(GIT_DIR_ENVIRONMENT, cmd + 10, 1);
  72                } else if (!strcmp(cmd, "--bare")) {
  73                        static char git_dir[PATH_MAX+1];
  74                        setenv(GIT_DIR_ENVIRONMENT, getcwd(git_dir, sizeof(git_dir)), 1);
  75                } else {
  76                        fprintf(stderr, "Unknown option: %s\n", cmd);
  77                        usage(git_usage_string);
  78                }
  79
  80                (*argv)++;
  81                (*argc)--;
  82                handled++;
  83        }
  84        return handled;
  85}
  86
  87static const char *alias_command;
  88static char *alias_string;
  89
  90static int git_alias_config(const char *var, const char *value)
  91{
  92        if (!prefixcmp(var, "alias.") && !strcmp(var + 6, alias_command)) {
  93                alias_string = xstrdup(value);
  94        }
  95        return 0;
  96}
  97
  98static int split_cmdline(char *cmdline, const char ***argv)
  99{
 100        int src, dst, count = 0, size = 16;
 101        char quoted = 0;
 102
 103        *argv = xmalloc(sizeof(char*) * size);
 104
 105        /* split alias_string */
 106        (*argv)[count++] = cmdline;
 107        for (src = dst = 0; cmdline[src];) {
 108                char c = cmdline[src];
 109                if (!quoted && isspace(c)) {
 110                        cmdline[dst++] = 0;
 111                        while (cmdline[++src]
 112                                        && isspace(cmdline[src]))
 113                                ; /* skip */
 114                        if (count >= size) {
 115                                size += 16;
 116                                *argv = xrealloc(*argv, sizeof(char*) * size);
 117                        }
 118                        (*argv)[count++] = cmdline + dst;
 119                } else if(!quoted && (c == '\'' || c == '"')) {
 120                        quoted = c;
 121                        src++;
 122                } else if (c == quoted) {
 123                        quoted = 0;
 124                        src++;
 125                } else {
 126                        if (c == '\\' && quoted != '\'') {
 127                                src++;
 128                                c = cmdline[src];
 129                                if (!c) {
 130                                        free(*argv);
 131                                        *argv = NULL;
 132                                        return error("cmdline ends with \\");
 133                                }
 134                        }
 135                        cmdline[dst++] = c;
 136                        src++;
 137                }
 138        }
 139
 140        cmdline[dst] = 0;
 141
 142        if (quoted) {
 143                free(*argv);
 144                *argv = NULL;
 145                return error("unclosed quote");
 146        }
 147
 148        return count;
 149}
 150
 151static int handle_alias(int *argcp, const char ***argv)
 152{
 153        int nongit = 0, ret = 0, saved_errno = errno;
 154        const char *subdir;
 155        int count, option_count;
 156        const char** new_argv;
 157
 158        subdir = setup_git_directory_gently(&nongit);
 159
 160        alias_command = (*argv)[0];
 161        git_config(git_alias_config);
 162        if (alias_string) {
 163                if (alias_string[0] == '!') {
 164                        trace_printf("trace: alias to shell cmd: %s => %s\n",
 165                                     alias_command, alias_string + 1);
 166                        ret = system(alias_string + 1);
 167                        if (ret >= 0 && WIFEXITED(ret) &&
 168                            WEXITSTATUS(ret) != 127)
 169                                exit(WEXITSTATUS(ret));
 170                        die("Failed to run '%s' when expanding alias '%s'\n",
 171                            alias_string + 1, alias_command);
 172                }
 173                count = split_cmdline(alias_string, &new_argv);
 174                option_count = handle_options(&new_argv, &count);
 175                memmove(new_argv - option_count, new_argv,
 176                                count * sizeof(char *));
 177                new_argv -= option_count;
 178
 179                if (count < 1)
 180                        die("empty alias for %s", alias_command);
 181
 182                if (!strcmp(alias_command, new_argv[0]))
 183                        die("recursive alias: %s", alias_command);
 184
 185                trace_argv_printf(new_argv, count,
 186                                  "trace: alias expansion: %s =>",
 187                                  alias_command);
 188
 189                new_argv = xrealloc(new_argv, sizeof(char*) *
 190                                    (count + *argcp + 1));
 191                /* insert after command name */
 192                memcpy(new_argv + count, *argv + 1, sizeof(char*) * *argcp);
 193                new_argv[count+*argcp] = NULL;
 194
 195                *argv = new_argv;
 196                *argcp += count - 1;
 197
 198                ret = 1;
 199        }
 200
 201        if (subdir)
 202                chdir(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 NOT_BARE        (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_command(struct cmd_struct *p, int argc, const char **argv)
 226{
 227        const char *prefix;
 228
 229        prefix = NULL;
 230        if (p->option & RUN_SETUP)
 231                prefix = setup_git_directory();
 232        if (p->option & USE_PAGER)
 233                setup_pager();
 234        if (p->option & NOT_BARE) {
 235                if (is_bare_repository() || is_inside_git_dir())
 236                        die("%s must be run in a work tree", p->cmd);
 237        }
 238        trace_argv_printf(argv, argc, "trace: built-in: git");
 239
 240        return p->fn(argc, argv, prefix);
 241}
 242
 243static void handle_internal_command(int argc, const char **argv)
 244{
 245        const char *cmd = argv[0];
 246        static struct cmd_struct commands[] = {
 247                { "add", cmd_add, RUN_SETUP | NOT_BARE },
 248                { "annotate", cmd_annotate, RUN_SETUP | USE_PAGER },
 249                { "apply", cmd_apply },
 250                { "archive", cmd_archive },
 251                { "blame", cmd_blame, RUN_SETUP },
 252                { "branch", cmd_branch, RUN_SETUP },
 253                { "bundle", cmd_bundle },
 254                { "cat-file", cmd_cat_file, RUN_SETUP },
 255                { "checkout-index", cmd_checkout_index, RUN_SETUP },
 256                { "check-ref-format", cmd_check_ref_format },
 257                { "check-attr", cmd_check_attr, RUN_SETUP | NOT_BARE },
 258                { "cherry", cmd_cherry, RUN_SETUP },
 259                { "cherry-pick", cmd_cherry_pick, RUN_SETUP | NOT_BARE },
 260                { "commit-tree", cmd_commit_tree, RUN_SETUP },
 261                { "config", cmd_config },
 262                { "count-objects", cmd_count_objects, RUN_SETUP },
 263                { "describe", cmd_describe, RUN_SETUP },
 264                { "diff", cmd_diff, USE_PAGER },
 265                { "diff-files", cmd_diff_files },
 266                { "diff-index", cmd_diff_index, RUN_SETUP },
 267                { "diff-tree", cmd_diff_tree, RUN_SETUP },
 268                { "fetch--tool", cmd_fetch__tool, RUN_SETUP },
 269                { "fmt-merge-msg", cmd_fmt_merge_msg, RUN_SETUP },
 270                { "for-each-ref", cmd_for_each_ref, RUN_SETUP },
 271                { "format-patch", cmd_format_patch, RUN_SETUP },
 272                { "fsck", cmd_fsck, RUN_SETUP },
 273                { "fsck-objects", cmd_fsck, RUN_SETUP },
 274                { "gc", cmd_gc, RUN_SETUP },
 275                { "get-tar-commit-id", cmd_get_tar_commit_id },
 276                { "grep", cmd_grep, RUN_SETUP | USE_PAGER },
 277                { "help", cmd_help },
 278                { "init", cmd_init_db },
 279                { "init-db", cmd_init_db },
 280                { "log", cmd_log, RUN_SETUP | USE_PAGER },
 281                { "ls-files", cmd_ls_files, RUN_SETUP },
 282                { "ls-tree", cmd_ls_tree, RUN_SETUP },
 283                { "mailinfo", cmd_mailinfo },
 284                { "mailsplit", cmd_mailsplit },
 285                { "merge-base", cmd_merge_base, RUN_SETUP },
 286                { "merge-file", cmd_merge_file },
 287                { "mv", cmd_mv, RUN_SETUP | NOT_BARE },
 288                { "name-rev", cmd_name_rev, RUN_SETUP },
 289                { "pack-objects", cmd_pack_objects, RUN_SETUP },
 290                { "pickaxe", cmd_blame, RUN_SETUP | USE_PAGER },
 291                { "prune", cmd_prune, RUN_SETUP },
 292                { "prune-packed", cmd_prune_packed, RUN_SETUP },
 293                { "push", cmd_push, RUN_SETUP },
 294                { "read-tree", cmd_read_tree, RUN_SETUP },
 295                { "reflog", cmd_reflog, RUN_SETUP },
 296                { "repo-config", cmd_config },
 297                { "rerere", cmd_rerere, RUN_SETUP },
 298                { "rev-list", cmd_rev_list, RUN_SETUP },
 299                { "rev-parse", cmd_rev_parse, RUN_SETUP },
 300                { "revert", cmd_revert, RUN_SETUP | NOT_BARE },
 301                { "rm", cmd_rm, RUN_SETUP | NOT_BARE },
 302                { "runstatus", cmd_runstatus, RUN_SETUP | NOT_BARE },
 303                { "shortlog", cmd_shortlog, RUN_SETUP | USE_PAGER },
 304                { "show-branch", cmd_show_branch, RUN_SETUP },
 305                { "show", cmd_show, RUN_SETUP | USE_PAGER },
 306                { "stripspace", cmd_stripspace },
 307                { "symbolic-ref", cmd_symbolic_ref, RUN_SETUP },
 308                { "tar-tree", cmd_tar_tree },
 309                { "unpack-objects", cmd_unpack_objects, RUN_SETUP },
 310                { "update-index", cmd_update_index, RUN_SETUP },
 311                { "update-ref", cmd_update_ref, RUN_SETUP },
 312                { "upload-archive", cmd_upload_archive },
 313                { "version", cmd_version },
 314                { "whatchanged", cmd_whatchanged, RUN_SETUP | USE_PAGER },
 315                { "write-tree", cmd_write_tree, RUN_SETUP },
 316                { "verify-pack", cmd_verify_pack },
 317                { "show-ref", cmd_show_ref, RUN_SETUP },
 318                { "pack-refs", cmd_pack_refs, RUN_SETUP },
 319        };
 320        int i;
 321
 322        /* Turn "git cmd --help" into "git help cmd" */
 323        if (argc > 1 && !strcmp(argv[1], "--help")) {
 324                argv[1] = argv[0];
 325                argv[0] = cmd = "help";
 326        }
 327
 328        for (i = 0; i < ARRAY_SIZE(commands); i++) {
 329                struct cmd_struct *p = commands+i;
 330                if (strcmp(p->cmd, cmd))
 331                        continue;
 332                exit(run_command(p, argc, argv));
 333        }
 334}
 335
 336int main(int argc, const char **argv)
 337{
 338        const char *cmd = argv[0] ? argv[0] : "git-help";
 339        char *slash = strrchr(cmd, '/');
 340        const char *exec_path = NULL;
 341        int done_alias = 0;
 342
 343        /*
 344         * Take the basename of argv[0] as the command
 345         * name, and the dirname as the default exec_path
 346         * if it's an absolute path and we don't have
 347         * anything better.
 348         */
 349        if (slash) {
 350                *slash++ = 0;
 351                if (*cmd == '/')
 352                        exec_path = cmd;
 353                cmd = slash;
 354        }
 355
 356        /*
 357         * "git-xxxx" is the same as "git xxxx", but we obviously:
 358         *
 359         *  - cannot take flags in between the "git" and the "xxxx".
 360         *  - cannot execute it externally (since it would just do
 361         *    the same thing over again)
 362         *
 363         * So we just directly call the internal command handler, and
 364         * die if that one cannot handle it.
 365         */
 366        if (!prefixcmp(cmd, "git-")) {
 367                cmd += 4;
 368                argv[0] = cmd;
 369                handle_internal_command(argc, argv);
 370                die("cannot handle %s internally", cmd);
 371        }
 372
 373        /* Look for flags.. */
 374        argv++;
 375        argc--;
 376        handle_options(&argv, &argc);
 377        if (argc > 0) {
 378                if (!prefixcmp(argv[0], "--"))
 379                        argv[0] += 2;
 380        } else {
 381                /* Default command: "help" */
 382                argv[0] = "help";
 383                argc = 1;
 384        }
 385        cmd = argv[0];
 386
 387        /*
 388         * We search for git commands in the following order:
 389         *  - git_exec_path()
 390         *  - the path of the "git" command if we could find it
 391         *    in $0
 392         *  - the regular PATH.
 393         */
 394        if (exec_path)
 395                prepend_to_path(exec_path, strlen(exec_path));
 396        exec_path = git_exec_path();
 397        prepend_to_path(exec_path, strlen(exec_path));
 398
 399        while (1) {
 400                /* See if it's an internal command */
 401                handle_internal_command(argc, argv);
 402
 403                /* .. then try the external ones */
 404                execv_git_cmd(argv);
 405
 406                /* It could be an alias -- this works around the insanity
 407                 * of overriding "git log" with "git show" by having
 408                 * alias.log = show
 409                 */
 410                if (done_alias || !handle_alias(&argc, &argv))
 411                        break;
 412                done_alias = 1;
 413        }
 414
 415        if (errno == ENOENT) {
 416                if (done_alias) {
 417                        fprintf(stderr, "Expansion of alias '%s' failed; "
 418                                "'%s' is not a git-command\n",
 419                                cmd, argv[0]);
 420                        exit(1);
 421                }
 422                help_unknown_cmd(cmd);
 423        }
 424
 425        fprintf(stderr, "Failed to run command '%s': %s\n",
 426                cmd, strerror(errno));
 427
 428        return 1;
 429}