Andrew's git - gitweb.git/blob

2fbe96b9bac35274a6ae0b6f294d94429c94b044
   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
   9const char git_more_info_string[] =
  10        "See 'git help COMMAND' for more information on a specific command.";
  11
  12static int handle_options(const char*** argv, int* argc, int* envchanged)
  13{
  14        int handled = 0;
  15
  16        while (*argc > 0) {
  17                const char *cmd = (*argv)[0];
  18                if (cmd[0] != '-')
  19                        break;
  20
  21                /*
  22                 * For legacy reasons, the "version" and "help"
  23                 * commands can be written with "--" prepended
  24                 * to make them look like flags.
  25                 */
  26                if (!strcmp(cmd, "--help") || !strcmp(cmd, "--version"))
  27                        break;
  28
  29                /*
  30                 * Check remaining flags.
  31                 */
  32                if (!prefixcmp(cmd, "--exec-path")) {
  33                        cmd += 11;
  34                        if (*cmd == '=')
  35                                git_set_argv_exec_path(cmd + 1);
  36                        else {
  37                                puts(git_exec_path());
  38                                exit(0);
  39                        }
  40                } else if (!strcmp(cmd, "-p") || !strcmp(cmd, "--paginate")) {
  41                        setup_pager();
  42                } else if (!strcmp(cmd, "--no-pager")) {
  43                        setenv("GIT_PAGER", "cat", 1);
  44                        if (envchanged)
  45                                *envchanged = 1;
  46                } else if (!strcmp(cmd, "--git-dir")) {
  47                        if (*argc < 2) {
  48                                fprintf(stderr, "No directory given for --git-dir.\n" );
  49                                usage(git_usage_string);
  50                        }
  51                        setenv(GIT_DIR_ENVIRONMENT, (*argv)[1], 1);
  52                        if (envchanged)
  53                                *envchanged = 1;
  54                        (*argv)++;
  55                        (*argc)--;
  56                        handled++;
  57                } else if (!prefixcmp(cmd, "--git-dir=")) {
  58                        setenv(GIT_DIR_ENVIRONMENT, cmd + 10, 1);
  59                        if (envchanged)
  60                                *envchanged = 1;
  61                } else if (!strcmp(cmd, "--work-tree")) {
  62                        if (*argc < 2) {
  63                                fprintf(stderr, "No directory given for --work-tree.\n" );
  64                                usage(git_usage_string);
  65                        }
  66                        setenv(GIT_WORK_TREE_ENVIRONMENT, (*argv)[1], 1);
  67                        if (envchanged)
  68                                *envchanged = 1;
  69                        (*argv)++;
  70                        (*argc)--;
  71                } else if (!prefixcmp(cmd, "--work-tree=")) {
  72                        setenv(GIT_WORK_TREE_ENVIRONMENT, cmd + 12, 1);
  73                        if (envchanged)
  74                                *envchanged = 1;
  75                } else if (!strcmp(cmd, "--bare")) {
  76                        static char git_dir[PATH_MAX+1];
  77                        is_bare_repository_cfg = 1;
  78                        setenv(GIT_DIR_ENVIRONMENT, getcwd(git_dir, sizeof(git_dir)), 0);
  79                        if (envchanged)
  80                                *envchanged = 1;
  81                } else {
  82                        fprintf(stderr, "Unknown option: %s\n", cmd);
  83                        usage(git_usage_string);
  84                }
  85
  86                (*argv)++;
  87                (*argc)--;
  88                handled++;
  89        }
  90        return handled;
  91}
  92
  93static int handle_alias(int *argcp, const char ***argv)
  94{
  95        int envchanged = 0, ret = 0, saved_errno = errno;
  96        const char *subdir;
  97        int count, option_count;
  98        const char** new_argv;
  99        const char *alias_command;
 100        char *alias_string;
 101        int unused_nongit;
 102
 103        subdir = setup_git_directory_gently(&unused_nongit);
 104
 105        alias_command = (*argv)[0];
 106        alias_string = alias_lookup(alias_command);
 107        if (alias_string) {
 108                if (alias_string[0] == '!') {
 109                        if (*argcp > 1) {
 110                                struct strbuf buf;
 111
 112                                strbuf_init(&buf, PATH_MAX);
 113                                strbuf_addstr(&buf, alias_string);
 114                                sq_quote_argv(&buf, (*argv) + 1, PATH_MAX);
 115                                free(alias_string);
 116                                alias_string = buf.buf;
 117                        }
 118                        trace_printf("trace: alias to shell cmd: %s => %s\n",
 119                                     alias_command, alias_string + 1);
 120                        ret = system(alias_string + 1);
 121                        if (ret >= 0 && WIFEXITED(ret) &&
 122                            WEXITSTATUS(ret) != 127)
 123                                exit(WEXITSTATUS(ret));
 124                        die("Failed to run '%s' when expanding alias '%s'\n",
 125                            alias_string + 1, alias_command);
 126                }
 127                count = split_cmdline(alias_string, &new_argv);
 128                option_count = handle_options(&new_argv, &count, &envchanged);
 129                if (envchanged)
 130                        die("alias '%s' changes environment variables\n"
 131                                 "You can use '!git' in the alias to do this.",
 132                                 alias_command);
 133                memmove(new_argv - option_count, new_argv,
 134                                count * sizeof(char *));
 135                new_argv -= option_count;
 136
 137                if (count < 1)
 138                        die("empty alias for %s", alias_command);
 139
 140                if (!strcmp(alias_command, new_argv[0]))
 141                        die("recursive alias: %s", alias_command);
 142
 143                trace_argv_printf(new_argv,
 144                                  "trace: alias expansion: %s =>",
 145                                  alias_command);
 146
 147                new_argv = xrealloc(new_argv, sizeof(char*) *
 148                                    (count + *argcp + 1));
 149                /* insert after command name */
 150                memcpy(new_argv + count, *argv + 1, sizeof(char*) * *argcp);
 151                new_argv[count+*argcp] = NULL;
 152
 153                *argv = new_argv;
 154                *argcp += count - 1;
 155
 156                ret = 1;
 157        }
 158
 159        if (subdir)
 160                chdir(subdir);
 161
 162        errno = saved_errno;
 163
 164        return ret;
 165}
 166
 167const char git_version_string[] = GIT_VERSION;
 168
 169#define RUN_SETUP       (1<<0)
 170#define USE_PAGER       (1<<1)
 171/*
 172 * require working tree to be present -- anything uses this needs
 173 * RUN_SETUP for reading from the configuration file.
 174 */
 175#define NEED_WORK_TREE  (1<<2)
 176
 177struct cmd_struct {
 178        const char *cmd;
 179        int (*fn)(int, const char **, const char *);
 180        int option;
 181};
 182
 183static int run_command(struct cmd_struct *p, int argc, const char **argv)
 184{
 185        int status;
 186        struct stat st;
 187        const char *prefix;
 188
 189        prefix = NULL;
 190        if (p->option & RUN_SETUP)
 191                prefix = setup_git_directory();
 192        if (p->option & USE_PAGER)
 193                setup_pager();
 194        if (p->option & NEED_WORK_TREE)
 195                setup_work_tree();
 196
 197        trace_argv_printf(argv, "trace: built-in: git");
 198
 199        status = p->fn(argc, argv, prefix);
 200        if (status)
 201                return status & 0xff;
 202
 203        /* Somebody closed stdout? */
 204        if (fstat(fileno(stdout), &st))
 205                return 0;
 206        /* Ignore write errors for pipes and sockets.. */
 207        if (S_ISFIFO(st.st_mode) || S_ISSOCK(st.st_mode))
 208                return 0;
 209
 210        /* Check for ENOSPC and EIO errors.. */
 211        if (fflush(stdout))
 212                die("write failure on standard output: %s", strerror(errno));
 213        if (ferror(stdout))
 214                die("unknown write failure on standard output");
 215        if (fclose(stdout))
 216                die("close failed on standard output: %s", strerror(errno));
 217        return 0;
 218}
 219
 220static void handle_internal_command(int argc, const char **argv)
 221{
 222        const char *cmd = argv[0];
 223        static struct cmd_struct commands[] = {
 224                { "add", cmd_add, RUN_SETUP | NEED_WORK_TREE },
 225                { "annotate", cmd_annotate, RUN_SETUP },
 226                { "apply", cmd_apply },
 227                { "archive", cmd_archive },
 228                { "blame", cmd_blame, RUN_SETUP },
 229                { "branch", cmd_branch, RUN_SETUP },
 230                { "bundle", cmd_bundle },
 231                { "cat-file", cmd_cat_file, RUN_SETUP },
 232                { "checkout", cmd_checkout, RUN_SETUP | NEED_WORK_TREE },
 233                { "checkout-index", cmd_checkout_index,
 234                        RUN_SETUP | NEED_WORK_TREE},
 235                { "check-ref-format", cmd_check_ref_format },
 236                { "check-attr", cmd_check_attr, RUN_SETUP },
 237                { "cherry", cmd_cherry, RUN_SETUP },
 238                { "cherry-pick", cmd_cherry_pick, RUN_SETUP | NEED_WORK_TREE },
 239                { "clone", cmd_clone },
 240                { "clean", cmd_clean, RUN_SETUP | NEED_WORK_TREE },
 241                { "commit", cmd_commit, RUN_SETUP | NEED_WORK_TREE },
 242                { "commit-tree", cmd_commit_tree, RUN_SETUP },
 243                { "config", cmd_config },
 244                { "count-objects", cmd_count_objects, RUN_SETUP },
 245                { "describe", cmd_describe, RUN_SETUP },
 246                { "diff", cmd_diff },
 247                { "diff-files", cmd_diff_files, RUN_SETUP },
 248                { "diff-index", cmd_diff_index, RUN_SETUP },
 249                { "diff-tree", cmd_diff_tree, RUN_SETUP },
 250                { "fast-export", cmd_fast_export, RUN_SETUP },
 251                { "fetch", cmd_fetch, RUN_SETUP },
 252                { "fetch-pack", cmd_fetch_pack, RUN_SETUP },
 253                { "fetch--tool", cmd_fetch__tool, RUN_SETUP },
 254                { "fmt-merge-msg", cmd_fmt_merge_msg, RUN_SETUP },
 255                { "for-each-ref", cmd_for_each_ref, RUN_SETUP },
 256                { "format-patch", cmd_format_patch, RUN_SETUP },
 257                { "fsck", cmd_fsck, RUN_SETUP },
 258                { "fsck-objects", cmd_fsck, RUN_SETUP },
 259                { "gc", cmd_gc, RUN_SETUP },
 260                { "get-tar-commit-id", cmd_get_tar_commit_id },
 261                { "grep", cmd_grep, RUN_SETUP | USE_PAGER },
 262                { "help", cmd_help },
 263#ifndef NO_CURL
 264                { "http-fetch", cmd_http_fetch, RUN_SETUP },
 265#endif
 266                { "init", cmd_init_db },
 267                { "init-db", cmd_init_db },
 268                { "log", cmd_log, RUN_SETUP | USE_PAGER },
 269                { "ls-files", cmd_ls_files, RUN_SETUP },
 270                { "ls-tree", cmd_ls_tree, RUN_SETUP },
 271                { "ls-remote", cmd_ls_remote },
 272                { "mailinfo", cmd_mailinfo },
 273                { "mailsplit", cmd_mailsplit },
 274                { "merge-base", cmd_merge_base, RUN_SETUP },
 275                { "merge-file", cmd_merge_file },
 276                { "merge-ours", cmd_merge_ours, RUN_SETUP },
 277                { "merge-recursive", cmd_merge_recursive, RUN_SETUP | NEED_WORK_TREE },
 278                { "merge-subtree", cmd_merge_recursive, RUN_SETUP | NEED_WORK_TREE },
 279                { "mv", cmd_mv, RUN_SETUP | NEED_WORK_TREE },
 280                { "name-rev", cmd_name_rev, RUN_SETUP },
 281                { "pack-objects", cmd_pack_objects, RUN_SETUP },
 282                { "peek-remote", cmd_ls_remote },
 283                { "pickaxe", cmd_blame, RUN_SETUP },
 284                { "prune", cmd_prune, RUN_SETUP },
 285                { "prune-packed", cmd_prune_packed, RUN_SETUP },
 286                { "push", cmd_push, RUN_SETUP },
 287                { "read-tree", cmd_read_tree, RUN_SETUP },
 288                { "reflog", cmd_reflog, RUN_SETUP },
 289                { "remote", cmd_remote, RUN_SETUP },
 290                { "repo-config", cmd_config },
 291                { "rerere", cmd_rerere, RUN_SETUP },
 292                { "reset", cmd_reset, RUN_SETUP },
 293                { "rev-list", cmd_rev_list, RUN_SETUP },
 294                { "rev-parse", cmd_rev_parse },
 295                { "revert", cmd_revert, RUN_SETUP | NEED_WORK_TREE },
 296                { "rm", cmd_rm, RUN_SETUP },
 297                { "send-pack", cmd_send_pack, RUN_SETUP },
 298                { "shortlog", cmd_shortlog, USE_PAGER },
 299                { "show-branch", cmd_show_branch, RUN_SETUP },
 300                { "show", cmd_show, RUN_SETUP | USE_PAGER },
 301                { "status", cmd_status, RUN_SETUP | NEED_WORK_TREE | USE_PAGER },
 302                { "stripspace", cmd_stripspace },
 303                { "symbolic-ref", cmd_symbolic_ref, RUN_SETUP },
 304                { "tag", cmd_tag, RUN_SETUP },
 305                { "tar-tree", cmd_tar_tree },
 306                { "unpack-objects", cmd_unpack_objects, RUN_SETUP },
 307                { "update-index", cmd_update_index, RUN_SETUP },
 308                { "update-ref", cmd_update_ref, RUN_SETUP },
 309                { "upload-archive", cmd_upload_archive },
 310                { "verify-tag", cmd_verify_tag, RUN_SETUP },
 311                { "version", cmd_version },
 312                { "whatchanged", cmd_whatchanged, RUN_SETUP | USE_PAGER },
 313                { "write-tree", cmd_write_tree, RUN_SETUP },
 314                { "verify-pack", cmd_verify_pack },
 315                { "show-ref", cmd_show_ref, RUN_SETUP },
 316                { "pack-refs", cmd_pack_refs, RUN_SETUP },
 317        };
 318        int i;
 319
 320        /* Turn "git cmd --help" into "git help cmd" */
 321        if (argc > 1 && !strcmp(argv[1], "--help")) {
 322                argv[1] = argv[0];
 323                argv[0] = cmd = "help";
 324        }
 325
 326        for (i = 0; i < ARRAY_SIZE(commands); i++) {
 327                struct cmd_struct *p = commands+i;
 328                if (strcmp(p->cmd, cmd))
 329                        continue;
 330                exit(run_command(p, argc, argv));
 331        }
 332}
 333
 334int main(int argc, const char **argv)
 335{
 336        const char *cmd = argv[0] ? argv[0] : "git-help";
 337        char *slash = strrchr(cmd, '/');
 338        const char *cmd_path = NULL;
 339        int done_alias = 0;
 340
 341        /*
 342         * Take the basename of argv[0] as the command
 343         * name, and the dirname as the default exec_path
 344         * if we don't have anything better.
 345         */
 346        if (slash) {
 347                *slash++ = 0;
 348                cmd_path = cmd;
 349                cmd = slash;
 350        }
 351
 352        /*
 353         * "git-xxxx" is the same as "git xxxx", but we obviously:
 354         *
 355         *  - cannot take flags in between the "git" and the "xxxx".
 356         *  - cannot execute it externally (since it would just do
 357         *    the same thing over again)
 358         *
 359         * So we just directly call the internal command handler, and
 360         * die if that one cannot handle it.
 361         */
 362        if (!prefixcmp(cmd, "git-")) {
 363                cmd += 4;
 364                argv[0] = cmd;
 365                handle_internal_command(argc, argv);
 366                die("cannot handle %s internally", cmd);
 367        }
 368
 369        /* Look for flags.. */
 370        argv++;
 371        argc--;
 372        handle_options(&argv, &argc, NULL);
 373        if (argc > 0) {
 374                if (!prefixcmp(argv[0], "--"))
 375                        argv[0] += 2;
 376        } else {
 377                /* The user didn't specify a command; give them help */
 378                printf("usage: %s\n\n", git_usage_string);
 379                list_common_cmds_help();
 380                printf("\n%s\n", git_more_info_string);
 381                exit(1);
 382        }
 383        cmd = argv[0];
 384
 385        /*
 386         * We use PATH to find git commands, but we prepend some higher
 387         * precidence paths: the "--exec-path" option, the GIT_EXEC_PATH
 388         * environment, and the $(gitexecdir) from the Makefile at build
 389         * time.
 390         */
 391        setup_path(cmd_path);
 392
 393        while (1) {
 394                /* See if it's an internal command */
 395                handle_internal_command(argc, argv);
 396
 397                /* .. then try the external ones */
 398                execv_git_cmd(argv);
 399
 400                /* It could be an alias -- this works around the insanity
 401                 * of overriding "git log" with "git show" by having
 402                 * alias.log = show
 403                 */
 404                if (done_alias || !handle_alias(&argc, &argv))
 405                        break;
 406                done_alias = 1;
 407        }
 408
 409        if (errno == ENOENT) {
 410                if (done_alias) {
 411                        fprintf(stderr, "Expansion of alias '%s' failed; "
 412                                "'%s' is not a git-command\n",
 413                                cmd, argv[0]);
 414                        exit(1);
 415                }
 416                help_unknown_cmd(cmd);
 417        }
 418
 419        fprintf(stderr, "Failed to run command '%s': %s\n",
 420                cmd, strerror(errno));
 421
 422        return 1;
 423}