Andrew's git / gitweb.git / git.c
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git.con commit gtksourceview2 support for gitview (24ccd8b)
   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                                struct strbuf buf;
 191
 192                                strbuf_init(&buf, PATH_MAX);
 193                                strbuf_addstr(&buf, alias_string);
 194                                sq_quote_argv(&buf, (*argv) + 1, *argcp - 1, PATH_MAX);
 195                                free(alias_string);
 196                                alias_string = buf.buf;
 197                        }
 198                        trace_printf("trace: alias to shell cmd: %s => %s\n",
 199                                     alias_command, alias_string + 1);
 200                        ret = system(alias_string + 1);
 201                        if (ret >= 0 && WIFEXITED(ret) &&
 202                            WEXITSTATUS(ret) != 127)
 203                                exit(WEXITSTATUS(ret));
 204                        die("Failed to run '%s' when expanding alias '%s'\n",
 205                            alias_string + 1, alias_command);
 206                }
 207                count = split_cmdline(alias_string, &new_argv);
 208                option_count = handle_options(&new_argv, &count, &envchanged);
 209                if (envchanged)
 210                        die("alias '%s' changes environment variables\n"
 211                                 "You can use '!git' in the alias to do this.",
 212                                 alias_command);
 213                memmove(new_argv - option_count, new_argv,
 214                                count * sizeof(char *));
 215                new_argv -= option_count;
 216
 217                if (count < 1)
 218                        die("empty alias for %s", alias_command);
 219
 220                if (!strcmp(alias_command, new_argv[0]))
 221                        die("recursive alias: %s", alias_command);
 222
 223                trace_argv_printf(new_argv, count,
 224                                  "trace: alias expansion: %s =>",
 225                                  alias_command);
 226
 227                new_argv = xrealloc(new_argv, sizeof(char*) *
 228                                    (count + *argcp + 1));
 229                /* insert after command name */
 230                memcpy(new_argv + count, *argv + 1, sizeof(char*) * *argcp);
 231                new_argv[count+*argcp] = NULL;
 232
 233                *argv = new_argv;
 234                *argcp += count - 1;
 235
 236                ret = 1;
 237        }
 238
 239        if (subdir)
 240                chdir(subdir);
 241
 242        errno = saved_errno;
 243
 244        return ret;
 245}
 246
 247const char git_version_string[] = GIT_VERSION;
 248
 249#define RUN_SETUP       (1<<0)
 250#define USE_PAGER       (1<<1)
 251/*
 252 * require working tree to be present -- anything uses this needs
 253 * RUN_SETUP for reading from the configuration file.
 254 */
 255#define NEED_WORK_TREE  (1<<2)
 256
 257struct cmd_struct {
 258        const char *cmd;
 259        int (*fn)(int, const char **, const char *);
 260        int option;
 261};
 262
 263static int run_command(struct cmd_struct *p, int argc, const char **argv)
 264{
 265        int status;
 266        struct stat st;
 267        const char *prefix;
 268
 269        prefix = NULL;
 270        if (p->option & RUN_SETUP)
 271                prefix = setup_git_directory();
 272        if (p->option & USE_PAGER)
 273                setup_pager();
 274        if (p->option & NEED_WORK_TREE) {
 275                const char *work_tree = get_git_work_tree();
 276                const char *git_dir = get_git_dir();
 277                if (!is_absolute_path(git_dir))
 278                        set_git_dir(make_absolute_path(git_dir));
 279                if (!work_tree || chdir(work_tree))
 280                        die("%s must be run in a work tree", p->cmd);
 281        }
 282        trace_argv_printf(argv, argc, "trace: built-in: git");
 283
 284        status = p->fn(argc, argv, prefix);
 285        if (status)
 286                return status;
 287
 288        /* Somebody closed stdout? */
 289        if (fstat(fileno(stdout), &st))
 290                return 0;
 291        /* Ignore write errors for pipes and sockets.. */
 292        if (S_ISFIFO(st.st_mode) || S_ISSOCK(st.st_mode))
 293                return 0;
 294
 295        /* Check for ENOSPC and EIO errors.. */
 296        if (fflush(stdout))
 297                die("write failure on standard output: %s", strerror(errno));
 298        if (ferror(stdout))
 299                die("unknown write failure on standard output");
 300        if (fclose(stdout))
 301                die("close failed on standard output: %s", strerror(errno));
 302        return 0;
 303}
 304
 305static void handle_internal_command(int argc, const char **argv)
 306{
 307        const char *cmd = argv[0];
 308        static struct cmd_struct commands[] = {
 309                { "add", cmd_add, RUN_SETUP | NEED_WORK_TREE },
 310                { "annotate", cmd_annotate, RUN_SETUP },
 311                { "apply", cmd_apply },
 312                { "archive", cmd_archive },
 313                { "blame", cmd_blame, RUN_SETUP },
 314                { "branch", cmd_branch, RUN_SETUP },
 315                { "bundle", cmd_bundle },
 316                { "cat-file", cmd_cat_file, RUN_SETUP },
 317                { "checkout-index", cmd_checkout_index,
 318                        RUN_SETUP | NEED_WORK_TREE},
 319                { "check-ref-format", cmd_check_ref_format },
 320                { "check-attr", cmd_check_attr, RUN_SETUP | NEED_WORK_TREE },
 321                { "cherry", cmd_cherry, RUN_SETUP },
 322                { "cherry-pick", cmd_cherry_pick, RUN_SETUP | NEED_WORK_TREE },
 323                { "commit-tree", cmd_commit_tree, RUN_SETUP },
 324                { "config", cmd_config },
 325                { "count-objects", cmd_count_objects, RUN_SETUP },
 326                { "describe", cmd_describe, RUN_SETUP },
 327                { "diff", cmd_diff },
 328                { "diff-files", cmd_diff_files },
 329                { "diff-index", cmd_diff_index, RUN_SETUP },
 330                { "diff-tree", cmd_diff_tree, RUN_SETUP },
 331                { "fetch--tool", cmd_fetch__tool, RUN_SETUP },
 332                { "fmt-merge-msg", cmd_fmt_merge_msg, RUN_SETUP },
 333                { "for-each-ref", cmd_for_each_ref, RUN_SETUP },
 334                { "format-patch", cmd_format_patch, RUN_SETUP },
 335                { "fsck", cmd_fsck, RUN_SETUP },
 336                { "fsck-objects", cmd_fsck, RUN_SETUP },
 337                { "gc", cmd_gc, RUN_SETUP },
 338                { "get-tar-commit-id", cmd_get_tar_commit_id },
 339                { "grep", cmd_grep, RUN_SETUP | USE_PAGER },
 340                { "help", cmd_help },
 341                { "init", cmd_init_db },
 342                { "init-db", cmd_init_db },
 343                { "log", cmd_log, RUN_SETUP | USE_PAGER },
 344                { "ls-files", cmd_ls_files, RUN_SETUP },
 345                { "ls-tree", cmd_ls_tree, RUN_SETUP },
 346                { "mailinfo", cmd_mailinfo },
 347                { "mailsplit", cmd_mailsplit },
 348                { "merge-base", cmd_merge_base, RUN_SETUP },
 349                { "merge-file", cmd_merge_file },
 350                { "mv", cmd_mv, RUN_SETUP | NEED_WORK_TREE },
 351                { "name-rev", cmd_name_rev, RUN_SETUP },
 352                { "pack-objects", cmd_pack_objects, RUN_SETUP },
 353                { "pickaxe", cmd_blame, RUN_SETUP },
 354                { "prune", cmd_prune, RUN_SETUP },
 355                { "prune-packed", cmd_prune_packed, RUN_SETUP },
 356                { "push", cmd_push, RUN_SETUP },
 357                { "read-tree", cmd_read_tree, RUN_SETUP },
 358                { "reflog", cmd_reflog, RUN_SETUP },
 359                { "repo-config", cmd_config },
 360                { "rerere", cmd_rerere, RUN_SETUP },
 361                { "reset", cmd_reset, RUN_SETUP },
 362                { "rev-list", cmd_rev_list, RUN_SETUP },
 363                { "rev-parse", cmd_rev_parse, RUN_SETUP },
 364                { "revert", cmd_revert, RUN_SETUP | NEED_WORK_TREE },
 365                { "rm", cmd_rm, RUN_SETUP | NEED_WORK_TREE },
 366                { "runstatus", cmd_runstatus, RUN_SETUP | NEED_WORK_TREE },
 367                { "shortlog", cmd_shortlog, RUN_SETUP | USE_PAGER },
 368                { "show-branch", cmd_show_branch, RUN_SETUP },
 369                { "show", cmd_show, RUN_SETUP | USE_PAGER },
 370                { "stripspace", cmd_stripspace },
 371                { "symbolic-ref", cmd_symbolic_ref, RUN_SETUP },
 372                { "tag", cmd_tag, RUN_SETUP },
 373                { "tar-tree", cmd_tar_tree },
 374                { "unpack-objects", cmd_unpack_objects, RUN_SETUP },
 375                { "update-index", cmd_update_index, RUN_SETUP },
 376                { "update-ref", cmd_update_ref, RUN_SETUP },
 377                { "upload-archive", cmd_upload_archive },
 378                { "verify-tag", cmd_verify_tag, RUN_SETUP },
 379                { "version", cmd_version },
 380                { "whatchanged", cmd_whatchanged, RUN_SETUP | USE_PAGER },
 381                { "write-tree", cmd_write_tree, RUN_SETUP },
 382                { "verify-pack", cmd_verify_pack },
 383                { "show-ref", cmd_show_ref, RUN_SETUP },
 384                { "pack-refs", cmd_pack_refs, RUN_SETUP },
 385        };
 386        int i;
 387
 388        /* Turn "git cmd --help" into "git help cmd" */
 389        if (argc > 1 && !strcmp(argv[1], "--help")) {
 390                argv[1] = argv[0];
 391                argv[0] = cmd = "help";
 392        }
 393
 394        for (i = 0; i < ARRAY_SIZE(commands); i++) {
 395                struct cmd_struct *p = commands+i;
 396                if (strcmp(p->cmd, cmd))
 397                        continue;
 398                exit(run_command(p, argc, argv));
 399        }
 400}
 401
 402int main(int argc, const char **argv)
 403{
 404        const char *cmd = argv[0] ? argv[0] : "git-help";
 405        char *slash = strrchr(cmd, '/');
 406        const char *exec_path = NULL;
 407        int done_alias = 0;
 408
 409        /*
 410         * Take the basename of argv[0] as the command
 411         * name, and the dirname as the default exec_path
 412         * if it's an absolute path and we don't have
 413         * anything better.
 414         */
 415        if (slash) {
 416                *slash++ = 0;
 417                if (*cmd == '/')
 418                        exec_path = cmd;
 419                cmd = slash;
 420        }
 421
 422        /*
 423         * "git-xxxx" is the same as "git xxxx", but we obviously:
 424         *
 425         *  - cannot take flags in between the "git" and the "xxxx".
 426         *  - cannot execute it externally (since it would just do
 427         *    the same thing over again)
 428         *
 429         * So we just directly call the internal command handler, and
 430         * die if that one cannot handle it.
 431         */
 432        if (!prefixcmp(cmd, "git-")) {
 433                cmd += 4;
 434                argv[0] = cmd;
 435                handle_internal_command(argc, argv);
 436                die("cannot handle %s internally", cmd);
 437        }
 438
 439        /* Look for flags.. */
 440        argv++;
 441        argc--;
 442        handle_options(&argv, &argc, NULL);
 443        if (argc > 0) {
 444                if (!prefixcmp(argv[0], "--"))
 445                        argv[0] += 2;
 446        } else {
 447                /* Default command: "help" */
 448                argv[0] = "help";
 449                argc = 1;
 450        }
 451        cmd = argv[0];
 452
 453        /*
 454         * We execute external git command via execv_git_cmd(),
 455         * which looks at "--exec-path" option, GIT_EXEC_PATH
 456         * environment, and $(gitexecdir) in Makefile while built,
 457         * in this order.  For scripted commands, we prepend
 458         * the value of the exec_path variable to the PATH.
 459         */
 460        if (exec_path)
 461                prepend_to_path(exec_path, strlen(exec_path));
 462        exec_path = git_exec_path();
 463        prepend_to_path(exec_path, strlen(exec_path));
 464
 465        while (1) {
 466                /* See if it's an internal command */
 467                handle_internal_command(argc, argv);
 468
 469                /* .. then try the external ones */
 470                execv_git_cmd(argv);
 471
 472                /* It could be an alias -- this works around the insanity
 473                 * of overriding "git log" with "git show" by having
 474                 * alias.log = show
 475                 */
 476                if (done_alias || !handle_alias(&argc, &argv))
 477                        break;
 478                done_alias = 1;
 479        }
 480
 481        if (errno == ENOENT) {
 482                if (done_alias) {
 483                        fprintf(stderr, "Expansion of alias '%s' failed; "
 484                                "'%s' is not a git-command\n",
 485                                cmd, argv[0]);
 486                        exit(1);
 487                }
 488                help_unknown_cmd(cmd);
 489        }
 490
 491        fprintf(stderr, "Failed to run command '%s': %s\n",
 492                cmd, strerror(errno));
 493
 494        return 1;
 495}