Andrew's git - gitweb.git/blob

cd3910afea0cc0e66e720413b2e03d8f00964ff6
   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)
  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, "--work-tree")) {
  73                        if (*argc < 2) {
  74                                fprintf(stderr, "No directory given for --work-tree.\n" );
  75                                usage(git_usage_string);
  76                        }
  77                        setenv(GIT_WORK_TREE_ENVIRONMENT, (*argv)[1], 1);
  78                        (*argv)++;
  79                        (*argc)--;
  80                } else if (!prefixcmp(cmd, "--work-tree=")) {
  81                        setenv(GIT_WORK_TREE_ENVIRONMENT, cmd + 12, 1);
  82                } else if (!strcmp(cmd, "--bare")) {
  83                        static char git_dir[PATH_MAX+1];
  84                        setenv(GIT_DIR_ENVIRONMENT, getcwd(git_dir, sizeof(git_dir)), 1);
  85                } else {
  86                        fprintf(stderr, "Unknown option: %s\n", cmd);
  87                        usage(git_usage_string);
  88                }
  89
  90                (*argv)++;
  91                (*argc)--;
  92                handled++;
  93        }
  94        return handled;
  95}
  96
  97static const char *alias_command;
  98static char *alias_string;
  99
 100static int git_alias_config(const char *var, const char *value)
 101{
 102        if (!prefixcmp(var, "alias.") && !strcmp(var + 6, alias_command)) {
 103                alias_string = xstrdup(value);
 104        }
 105        return 0;
 106}
 107
 108static int split_cmdline(char *cmdline, const char ***argv)
 109{
 110        int src, dst, count = 0, size = 16;
 111        char quoted = 0;
 112
 113        *argv = xmalloc(sizeof(char*) * size);
 114
 115        /* split alias_string */
 116        (*argv)[count++] = cmdline;
 117        for (src = dst = 0; cmdline[src];) {
 118                char c = cmdline[src];
 119                if (!quoted && isspace(c)) {
 120                        cmdline[dst++] = 0;
 121                        while (cmdline[++src]
 122                                        && isspace(cmdline[src]))
 123                                ; /* skip */
 124                        if (count >= size) {
 125                                size += 16;
 126                                *argv = xrealloc(*argv, sizeof(char*) * size);
 127                        }
 128                        (*argv)[count++] = cmdline + dst;
 129                } else if(!quoted && (c == '\'' || c == '"')) {
 130                        quoted = c;
 131                        src++;
 132                } else if (c == quoted) {
 133                        quoted = 0;
 134                        src++;
 135                } else {
 136                        if (c == '\\' && quoted != '\'') {
 137                                src++;
 138                                c = cmdline[src];
 139                                if (!c) {
 140                                        free(*argv);
 141                                        *argv = NULL;
 142                                        return error("cmdline ends with \\");
 143                                }
 144                        }
 145                        cmdline[dst++] = c;
 146                        src++;
 147                }
 148        }
 149
 150        cmdline[dst] = 0;
 151
 152        if (quoted) {
 153                free(*argv);
 154                *argv = NULL;
 155                return error("unclosed quote");
 156        }
 157
 158        return count;
 159}
 160
 161static int handle_alias(int *argcp, const char ***argv)
 162{
 163        int nongit = 0, ret = 0, saved_errno = errno;
 164        const char *subdir;
 165        int count, option_count;
 166        const char** new_argv;
 167
 168        subdir = setup_git_directory_gently(&nongit);
 169
 170        alias_command = (*argv)[0];
 171        git_config(git_alias_config);
 172        if (alias_string) {
 173                if (alias_string[0] == '!') {
 174                        trace_printf("trace: alias to shell cmd: %s => %s\n",
 175                                     alias_command, alias_string + 1);
 176                        ret = system(alias_string + 1);
 177                        if (ret >= 0 && WIFEXITED(ret) &&
 178                            WEXITSTATUS(ret) != 127)
 179                                exit(WEXITSTATUS(ret));
 180                        die("Failed to run '%s' when expanding alias '%s'\n",
 181                            alias_string + 1, alias_command);
 182                }
 183                count = split_cmdline(alias_string, &new_argv);
 184                option_count = handle_options(&new_argv, &count);
 185                memmove(new_argv - option_count, new_argv,
 186                                count * sizeof(char *));
 187                new_argv -= option_count;
 188
 189                if (count < 1)
 190                        die("empty alias for %s", alias_command);
 191
 192                if (!strcmp(alias_command, new_argv[0]))
 193                        die("recursive alias: %s", alias_command);
 194
 195                trace_argv_printf(new_argv, count,
 196                                  "trace: alias expansion: %s =>",
 197                                  alias_command);
 198
 199                new_argv = xrealloc(new_argv, sizeof(char*) *
 200                                    (count + *argcp + 1));
 201                /* insert after command name */
 202                memcpy(new_argv + count, *argv + 1, sizeof(char*) * *argcp);
 203                new_argv[count+*argcp] = NULL;
 204
 205                *argv = new_argv;
 206                *argcp += count - 1;
 207
 208                ret = 1;
 209        }
 210
 211        if (subdir)
 212                chdir(subdir);
 213
 214        errno = saved_errno;
 215
 216        return ret;
 217}
 218
 219const char git_version_string[] = GIT_VERSION;
 220
 221#define RUN_SETUP       (1<<0)
 222#define USE_PAGER       (1<<1)
 223/*
 224 * require working tree to be present -- anything uses this needs
 225 * RUN_SETUP for reading from the configuration file.
 226 */
 227#define NEED_WORK_TREE  (1<<2)
 228
 229static void handle_internal_command(int argc, const char **argv, char **envp)
 230{
 231        const char *cmd = argv[0];
 232        static struct cmd_struct {
 233                const char *cmd;
 234                int (*fn)(int, const char **, const char *);
 235                int option;
 236        } commands[] = {
 237                { "add", cmd_add, RUN_SETUP | NEED_WORK_TREE },
 238                { "annotate", cmd_annotate, RUN_SETUP | USE_PAGER },
 239                { "apply", cmd_apply },
 240                { "archive", cmd_archive },
 241                { "blame", cmd_blame, RUN_SETUP },
 242                { "branch", cmd_branch, RUN_SETUP },
 243                { "bundle", cmd_bundle },
 244                { "cat-file", cmd_cat_file, RUN_SETUP },
 245                { "checkout-index", cmd_checkout_index, RUN_SETUP },
 246                { "check-ref-format", cmd_check_ref_format },
 247                { "check-attr", cmd_check_attr, RUN_SETUP | NEED_WORK_TREE },
 248                { "cherry", cmd_cherry, RUN_SETUP },
 249                { "cherry-pick", cmd_cherry_pick, RUN_SETUP | NEED_WORK_TREE },
 250                { "commit-tree", cmd_commit_tree, RUN_SETUP },
 251                { "config", cmd_config },
 252                { "count-objects", cmd_count_objects, RUN_SETUP },
 253                { "describe", cmd_describe, RUN_SETUP },
 254                { "diff", cmd_diff, USE_PAGER },
 255                { "diff-files", cmd_diff_files },
 256                { "diff-index", cmd_diff_index, RUN_SETUP },
 257                { "diff-tree", cmd_diff_tree, RUN_SETUP },
 258                { "fetch--tool", cmd_fetch__tool, RUN_SETUP },
 259                { "fmt-merge-msg", cmd_fmt_merge_msg, RUN_SETUP },
 260                { "for-each-ref", cmd_for_each_ref, RUN_SETUP },
 261                { "format-patch", cmd_format_patch, RUN_SETUP },
 262                { "fsck", cmd_fsck, RUN_SETUP },
 263                { "fsck-objects", cmd_fsck, RUN_SETUP },
 264                { "gc", cmd_gc, RUN_SETUP },
 265                { "get-tar-commit-id", cmd_get_tar_commit_id },
 266                { "grep", cmd_grep, RUN_SETUP | USE_PAGER },
 267                { "help", cmd_help },
 268                { "init", cmd_init_db },
 269                { "init-db", cmd_init_db },
 270                { "log", cmd_log, RUN_SETUP | USE_PAGER },
 271                { "ls-files", cmd_ls_files, RUN_SETUP },
 272                { "ls-tree", cmd_ls_tree, RUN_SETUP },
 273                { "mailinfo", cmd_mailinfo },
 274                { "mailsplit", cmd_mailsplit },
 275                { "merge-base", cmd_merge_base, RUN_SETUP },
 276                { "merge-file", cmd_merge_file },
 277                { "mv", cmd_mv, RUN_SETUP | NEED_WORK_TREE },
 278                { "name-rev", cmd_name_rev, RUN_SETUP },
 279                { "pack-objects", cmd_pack_objects, RUN_SETUP },
 280                { "pickaxe", cmd_blame, RUN_SETUP | USE_PAGER },
 281                { "prune", cmd_prune, RUN_SETUP },
 282                { "prune-packed", cmd_prune_packed, RUN_SETUP },
 283                { "push", cmd_push, RUN_SETUP },
 284                { "read-tree", cmd_read_tree, RUN_SETUP },
 285                { "reflog", cmd_reflog, RUN_SETUP },
 286                { "repo-config", cmd_config },
 287                { "rerere", cmd_rerere, RUN_SETUP },
 288                { "rev-list", cmd_rev_list, RUN_SETUP },
 289                { "rev-parse", cmd_rev_parse, RUN_SETUP },
 290                { "revert", cmd_revert, RUN_SETUP | NEED_WORK_TREE },
 291                { "rm", cmd_rm, RUN_SETUP | NEED_WORK_TREE },
 292                { "runstatus", cmd_runstatus, RUN_SETUP | NEED_WORK_TREE },
 293                { "shortlog", cmd_shortlog, RUN_SETUP | USE_PAGER },
 294                { "show-branch", cmd_show_branch, RUN_SETUP },
 295                { "show", cmd_show, RUN_SETUP | USE_PAGER },
 296                { "stripspace", cmd_stripspace },
 297                { "symbolic-ref", cmd_symbolic_ref, RUN_SETUP },
 298                { "tar-tree", cmd_tar_tree },
 299                { "unpack-objects", cmd_unpack_objects, RUN_SETUP },
 300                { "update-index", cmd_update_index, RUN_SETUP },
 301                { "update-ref", cmd_update_ref, RUN_SETUP },
 302                { "upload-archive", cmd_upload_archive },
 303                { "version", cmd_version },
 304                { "whatchanged", cmd_whatchanged, RUN_SETUP | USE_PAGER },
 305                { "write-tree", cmd_write_tree, RUN_SETUP },
 306                { "verify-pack", cmd_verify_pack },
 307                { "show-ref", cmd_show_ref, RUN_SETUP },
 308                { "pack-refs", cmd_pack_refs, RUN_SETUP },
 309        };
 310        int i;
 311
 312        /* Turn "git cmd --help" into "git help cmd" */
 313        if (argc > 1 && !strcmp(argv[1], "--help")) {
 314                argv[1] = argv[0];
 315                argv[0] = cmd = "help";
 316        }
 317
 318        for (i = 0; i < ARRAY_SIZE(commands); i++) {
 319                struct cmd_struct *p = commands+i;
 320                const char *prefix;
 321                if (strcmp(p->cmd, cmd))
 322                        continue;
 323
 324                prefix = NULL;
 325                if (p->option & RUN_SETUP)
 326                        prefix = setup_git_directory();
 327                if (p->option & USE_PAGER)
 328                        setup_pager();
 329                if ((p->option & NEED_WORK_TREE) &&
 330                                (!is_inside_work_tree() || is_inside_git_dir()))
 331                        die("%s must be run in a work tree", cmd);
 332                trace_argv_printf(argv, argc, "trace: built-in: git");
 333
 334                exit(p->fn(argc, argv, prefix));
 335        }
 336}
 337
 338int main(int argc, const char **argv, char **envp)
 339{
 340        const char *cmd = argv[0] ? argv[0] : "git-help";
 341        char *slash = strrchr(cmd, '/');
 342        const char *exec_path = NULL;
 343        int done_alias = 0;
 344
 345        /*
 346         * Take the basename of argv[0] as the command
 347         * name, and the dirname as the default exec_path
 348         * if it's an absolute path and we don't have
 349         * anything better.
 350         */
 351        if (slash) {
 352                *slash++ = 0;
 353                if (*cmd == '/')
 354                        exec_path = cmd;
 355                cmd = slash;
 356        }
 357
 358        /*
 359         * "git-xxxx" is the same as "git xxxx", but we obviously:
 360         *
 361         *  - cannot take flags in between the "git" and the "xxxx".
 362         *  - cannot execute it externally (since it would just do
 363         *    the same thing over again)
 364         *
 365         * So we just directly call the internal command handler, and
 366         * die if that one cannot handle it.
 367         */
 368        if (!prefixcmp(cmd, "git-")) {
 369                cmd += 4;
 370                argv[0] = cmd;
 371                handle_internal_command(argc, argv, envp);
 372                die("cannot handle %s internally", cmd);
 373        }
 374
 375        /* Look for flags.. */
 376        argv++;
 377        argc--;
 378        handle_options(&argv, &argc);
 379        if (argc > 0) {
 380                if (!prefixcmp(argv[0], "--"))
 381                        argv[0] += 2;
 382        } else {
 383                /* Default command: "help" */
 384                argv[0] = "help";
 385                argc = 1;
 386        }
 387        cmd = argv[0];
 388
 389        /*
 390         * We search for git commands in the following order:
 391         *  - git_exec_path()
 392         *  - the path of the "git" command if we could find it
 393         *    in $0
 394         *  - the regular PATH.
 395         */
 396        if (exec_path)
 397                prepend_to_path(exec_path, strlen(exec_path));
 398        exec_path = git_exec_path();
 399        prepend_to_path(exec_path, strlen(exec_path));
 400
 401        while (1) {
 402                /* See if it's an internal command */
 403                handle_internal_command(argc, argv, envp);
 404
 405                /* .. then try the external ones */
 406                execv_git_cmd(argv);
 407
 408                /* It could be an alias -- this works around the insanity
 409                 * of overriding "git log" with "git show" by having
 410                 * alias.log = show
 411                 */
 412                if (done_alias || !handle_alias(&argc, &argv))
 413                        break;
 414                done_alias = 1;
 415        }
 416
 417        if (errno == ENOENT) {
 418                if (done_alias) {
 419                        fprintf(stderr, "Expansion of alias '%s' failed; "
 420                                "'%s' is not a git-command\n",
 421                                cmd, argv[0]);
 422                        exit(1);
 423                }
 424                help_unknown_cmd(cmd);
 425        }
 426
 427        fprintf(stderr, "Failed to run command '%s': %s\n",
 428                cmd, strerror(errno));
 429
 430        return 1;
 431}