Andrew's git - gitweb.git/blob

   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                } else if (!prefixcmp(cmd, "--git-dir=")) {
  70                        setenv(GIT_DIR_ENVIRONMENT, cmd + 10, 1);
  71                } else if (!strcmp(cmd, "--bare")) {
  72                        static char git_dir[PATH_MAX+1];
  73                        setenv(GIT_DIR_ENVIRONMENT, getcwd(git_dir, sizeof(git_dir)), 1);
  74                } else {
  75                        fprintf(stderr, "Unknown option: %s\n", cmd);
  76                        usage(git_usage_string);
  77                }
  78
  79                (*argv)++;
  80                (*argc)--;
  81                handled++;
  82        }
  83        return handled;
  84}
  85
  86static const char *alias_command;
  87static char *alias_string;
  88
  89static int git_alias_config(const char *var, const char *value)
  90{
  91        if (!prefixcmp(var, "alias.") && !strcmp(var + 6, alias_command)) {
  92                alias_string = xstrdup(value);
  93        }
  94        return 0;
  95}
  96
  97static int split_cmdline(char *cmdline, const char ***argv)
  98{
  99        int src, dst, count = 0, size = 16;
 100        char quoted = 0;
 101
 102        *argv = malloc(sizeof(char*) * size);
 103
 104        /* split alias_string */
 105        (*argv)[count++] = cmdline;
 106        for (src = dst = 0; cmdline[src];) {
 107                char c = cmdline[src];
 108                if (!quoted && isspace(c)) {
 109                        cmdline[dst++] = 0;
 110                        while (cmdline[++src]
 111                                        && isspace(cmdline[src]))
 112                                ; /* skip */
 113                        if (count >= size) {
 114                                size += 16;
 115                                *argv = xrealloc(*argv, sizeof(char*) * size);
 116                        }
 117                        (*argv)[count++] = cmdline + dst;
 118                } else if(!quoted && (c == '\'' || c == '"')) {
 119                        quoted = c;
 120                        src++;
 121                } else if (c == quoted) {
 122                        quoted = 0;
 123                        src++;
 124                } else {
 125                        if (c == '\\' && quoted != '\'') {
 126                                src++;
 127                                c = cmdline[src];
 128                                if (!c) {
 129                                        free(*argv);
 130                                        *argv = NULL;
 131                                        return error("cmdline ends with \\");
 132                                }
 133                        }
 134                        cmdline[dst++] = c;
 135                        src++;
 136                }
 137        }
 138
 139        cmdline[dst] = 0;
 140
 141        if (quoted) {
 142                free(*argv);
 143                *argv = NULL;
 144                return error("unclosed quote");
 145        }
 146
 147        return count;
 148}
 149
 150static int handle_alias(int *argcp, const char ***argv)
 151{
 152        int nongit = 0, ret = 0, saved_errno = errno;
 153        const char *subdir;
 154        int count, option_count;
 155        const char** new_argv;
 156
 157        subdir = setup_git_directory_gently(&nongit);
 158
 159        alias_command = (*argv)[0];
 160        git_config(git_alias_config);
 161        if (alias_string) {
 162                if (alias_string[0] == '!') {
 163                        trace_printf("trace: alias to shell cmd: %s => %s\n",
 164                                     alias_command, alias_string + 1);
 165                        ret = system(alias_string + 1);
 166                        if (ret >= 0 && WIFEXITED(ret) &&
 167                            WEXITSTATUS(ret) != 127)
 168                                exit(WEXITSTATUS(ret));
 169                        die("Failed to run '%s' when expanding alias '%s'\n",
 170                            alias_string + 1, alias_command);
 171                }
 172                count = split_cmdline(alias_string, &new_argv);
 173                option_count = handle_options(&new_argv, &count);
 174                memmove(new_argv - option_count, new_argv,
 175                                count * sizeof(char *));
 176                new_argv -= option_count;
 177
 178                if (count < 1)
 179                        die("empty alias for %s", alias_command);
 180
 181                if (!strcmp(alias_command, new_argv[0]))
 182                        die("recursive alias: %s", alias_command);
 183
 184                trace_argv_printf(new_argv, count,
 185                                  "trace: alias expansion: %s =>",
 186                                  alias_command);
 187
 188                new_argv = xrealloc(new_argv, sizeof(char*) *
 189                                    (count + *argcp + 1));
 190                /* insert after command name */
 191                memcpy(new_argv + count, *argv + 1, sizeof(char*) * *argcp);
 192                new_argv[count+*argcp] = NULL;
 193
 194                *argv = new_argv;
 195                *argcp += count - 1;
 196
 197                ret = 1;
 198        }
 199
 200        if (subdir)
 201                chdir(subdir);
 202
 203        errno = saved_errno;
 204
 205        return ret;
 206}
 207
 208const char git_version_string[] = GIT_VERSION;
 209
 210#define RUN_SETUP       (1<<0)
 211#define USE_PAGER       (1<<1)
 212/*
 213 * require working tree to be present -- anything uses this needs
 214 * RUN_SETUP for reading from the configuration file.
 215 */
 216#define NOT_BARE        (1<<2)
 217
 218static void handle_internal_command(int argc, const char **argv, char **envp)
 219{
 220        const char *cmd = argv[0];
 221        static struct cmd_struct {
 222                const char *cmd;
 223                int (*fn)(int, const char **, const char *);
 224                int option;
 225        } commands[] = {
 226                { "add", cmd_add, RUN_SETUP | NOT_BARE },
 227                { "annotate", cmd_annotate, USE_PAGER },
 228                { "apply", cmd_apply },
 229                { "archive", cmd_archive },
 230                { "blame", cmd_blame, RUN_SETUP },
 231                { "branch", cmd_branch, RUN_SETUP },
 232                { "cat-file", cmd_cat_file, RUN_SETUP },
 233                { "checkout-index", cmd_checkout_index, RUN_SETUP },
 234                { "check-ref-format", cmd_check_ref_format },
 235                { "cherry", cmd_cherry, RUN_SETUP },
 236                { "commit-tree", cmd_commit_tree, RUN_SETUP },
 237                { "config", cmd_config },
 238                { "count-objects", cmd_count_objects, RUN_SETUP },
 239                { "describe", cmd_describe, RUN_SETUP },
 240                { "diff", cmd_diff, RUN_SETUP | USE_PAGER },
 241                { "diff-files", cmd_diff_files, RUN_SETUP },
 242                { "diff-index", cmd_diff_index, RUN_SETUP },
 243                { "diff-tree", cmd_diff_tree, RUN_SETUP },
 244                { "fmt-merge-msg", cmd_fmt_merge_msg, RUN_SETUP },
 245                { "for-each-ref", cmd_for_each_ref, RUN_SETUP },
 246                { "format-patch", cmd_format_patch, RUN_SETUP },
 247                { "fsck", cmd_fsck, RUN_SETUP },
 248                { "fsck-objects", cmd_fsck, RUN_SETUP },
 249                { "get-tar-commit-id", cmd_get_tar_commit_id },
 250                { "grep", cmd_grep, RUN_SETUP | USE_PAGER },
 251                { "help", cmd_help },
 252                { "init", cmd_init_db },
 253                { "init-db", cmd_init_db },
 254                { "log", cmd_log, RUN_SETUP | USE_PAGER },
 255                { "ls-files", cmd_ls_files, RUN_SETUP },
 256                { "ls-tree", cmd_ls_tree, RUN_SETUP },
 257                { "mailinfo", cmd_mailinfo },
 258                { "mailsplit", cmd_mailsplit },
 259                { "merge-base", cmd_merge_base, RUN_SETUP },
 260                { "merge-file", cmd_merge_file },
 261                { "mv", cmd_mv, RUN_SETUP | NOT_BARE },
 262                { "name-rev", cmd_name_rev, RUN_SETUP },
 263                { "pack-objects", cmd_pack_objects, RUN_SETUP },
 264                { "pickaxe", cmd_blame, RUN_SETUP | USE_PAGER },
 265                { "prune", cmd_prune, RUN_SETUP },
 266                { "prune-packed", cmd_prune_packed, RUN_SETUP },
 267                { "push", cmd_push, RUN_SETUP },
 268                { "read-tree", cmd_read_tree, RUN_SETUP },
 269                { "reflog", cmd_reflog, RUN_SETUP },
 270                { "repo-config", cmd_config },
 271                { "rerere", cmd_rerere, RUN_SETUP },
 272                { "rev-list", cmd_rev_list, RUN_SETUP },
 273                { "rev-parse", cmd_rev_parse, RUN_SETUP },
 274                { "rm", cmd_rm, RUN_SETUP | NOT_BARE },
 275                { "runstatus", cmd_runstatus, RUN_SETUP | NOT_BARE },
 276                { "shortlog", cmd_shortlog, RUN_SETUP | USE_PAGER },
 277                { "show-branch", cmd_show_branch, RUN_SETUP },
 278                { "show", cmd_show, RUN_SETUP | USE_PAGER },
 279                { "stripspace", cmd_stripspace },
 280                { "symbolic-ref", cmd_symbolic_ref, RUN_SETUP },
 281                { "tar-tree", cmd_tar_tree },
 282                { "unpack-objects", cmd_unpack_objects, RUN_SETUP },
 283                { "update-index", cmd_update_index, RUN_SETUP },
 284                { "update-ref", cmd_update_ref, RUN_SETUP },
 285                { "upload-archive", cmd_upload_archive },
 286                { "version", cmd_version },
 287                { "whatchanged", cmd_whatchanged, RUN_SETUP | USE_PAGER },
 288                { "write-tree", cmd_write_tree, RUN_SETUP },
 289                { "verify-pack", cmd_verify_pack },
 290                { "show-ref", cmd_show_ref, RUN_SETUP },
 291                { "pack-refs", cmd_pack_refs, RUN_SETUP },
 292        };
 293        int i;
 294
 295        /* Turn "git cmd --help" into "git help cmd" */
 296        if (argc > 1 && !strcmp(argv[1], "--help")) {
 297                argv[1] = argv[0];
 298                argv[0] = cmd = "help";
 299        }
 300
 301        for (i = 0; i < ARRAY_SIZE(commands); i++) {
 302                struct cmd_struct *p = commands+i;
 303                const char *prefix;
 304                if (strcmp(p->cmd, cmd))
 305                        continue;
 306
 307                prefix = NULL;
 308                if (p->option & RUN_SETUP)
 309                        prefix = setup_git_directory();
 310                if (p->option & USE_PAGER)
 311                        setup_pager();
 312                if ((p->option & NOT_BARE) &&
 313                                (is_bare_repository() || is_inside_git_dir()))
 314                        die("%s must be run in a work tree", cmd);
 315                trace_argv_printf(argv, argc, "trace: built-in: git");
 316
 317                exit(p->fn(argc, argv, prefix));
 318        }
 319}
 320
 321int main(int argc, const char **argv, char **envp)
 322{
 323        const char *cmd = argv[0] ? argv[0] : "git-help";
 324        char *slash = strrchr(cmd, '/');
 325        const char *exec_path = NULL;
 326        int done_alias = 0;
 327
 328        /*
 329         * Take the basename of argv[0] as the command
 330         * name, and the dirname as the default exec_path
 331         * if it's an absolute path and we don't have
 332         * anything better.
 333         */
 334        if (slash) {
 335                *slash++ = 0;
 336                if (*cmd == '/')
 337                        exec_path = cmd;
 338                cmd = slash;
 339        }
 340
 341        /*
 342         * "git-xxxx" is the same as "git xxxx", but we obviously:
 343         *
 344         *  - cannot take flags in between the "git" and the "xxxx".
 345         *  - cannot execute it externally (since it would just do
 346         *    the same thing over again)
 347         *
 348         * So we just directly call the internal command handler, and
 349         * die if that one cannot handle it.
 350         */
 351        if (!prefixcmp(cmd, "git-")) {
 352                cmd += 4;
 353                argv[0] = cmd;
 354                handle_internal_command(argc, argv, envp);
 355                die("cannot handle %s internally", cmd);
 356        }
 357
 358        /* Look for flags.. */
 359        argv++;
 360        argc--;
 361        handle_options(&argv, &argc);
 362        if (argc > 0) {
 363                if (!prefixcmp(argv[0], "--"))
 364                        argv[0] += 2;
 365        } else {
 366                /* Default command: "help" */
 367                argv[0] = "help";
 368                argc = 1;
 369        }
 370        cmd = argv[0];
 371
 372        /*
 373         * We search for git commands in the following order:
 374         *  - git_exec_path()
 375         *  - the path of the "git" command if we could find it
 376         *    in $0
 377         *  - the regular PATH.
 378         */
 379        if (exec_path)
 380                prepend_to_path(exec_path, strlen(exec_path));
 381        exec_path = git_exec_path();
 382        prepend_to_path(exec_path, strlen(exec_path));
 383
 384        while (1) {
 385                /* See if it's an internal command */
 386                handle_internal_command(argc, argv, envp);
 387
 388                /* .. then try the external ones */
 389                execv_git_cmd(argv);
 390
 391                /* It could be an alias -- this works around the insanity
 392                 * of overriding "git log" with "git show" by having
 393                 * alias.log = show
 394                 */
 395                if (done_alias || !handle_alias(&argc, &argv))
 396                        break;
 397                done_alias = 1;
 398        }
 399
 400        if (errno == ENOENT) {
 401                if (done_alias) {
 402                        fprintf(stderr, "Expansion of alias '%s' failed; "
 403                                "'%s' is not a git-command\n",
 404                                cmd, argv[0]);
 405                        exit(1);
 406                }
 407                help_unknown_cmd(cmd);
 408        }
 409
 410        fprintf(stderr, "Failed to run command '%s': %s\n",
 411                cmd, strerror(errno));
 412
 413        return 1;
 414}