git.c

   1 #include "builtin.h"
   2 #include "exec_cmd.h"
   3 #include "cache.h"
   4 #include "quote.h"
   5
   6 const 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
   9 static 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 #ifdef __MINGW32__
  24         path[len] = ';';
  25 #else
  26         path[len] = ':';
  27 #endif
  28         memcpy(path + len + 1, old_path, path_len - len);
  29
  30         setenv("PATH", path, 1);
  31
  32         free(path);
  33 }
  34
  35 static int handle_options(const char*** argv, int* argc, int* envchanged)
  36 {
  37         int handled = 0;
  38
  39         while (*argc > 0) {
  40                 const char *cmd = (*argv)[0];
  41                 if (cmd[0] != '-')
  42                         break;
  43
  44                 /*
  45                  * For legacy reasons, the "version" and "help"
  46                  * commands can be written with "--" prepended
  47                  * to make them look like flags.
  48                  */
  49                 if (!strcmp(cmd, "--help") || !strcmp(cmd, "--version"))
  50                         break;
  51
  52                 /*
  53                  * Check remaining flags.
  54                  */
  55                 if (!prefixcmp(cmd, "--exec-path")) {
  56                         cmd += 11;
  57                         if (*cmd == '=')
  58                                 git_set_exec_path(cmd + 1);
  59                         else {
  60                                 puts(git_exec_path());
  61                                 exit(0);
  62                         }
  63                 } else if (!strcmp(cmd, "-p") || !strcmp(cmd, "--paginate")) {
  64                         setup_pager();
  65                 } else if (!strcmp(cmd, "--no-pager")) {
  66                         setenv("GIT_PAGER", "cat", 1);
  67                         if (envchanged)
  68                                 *envchanged = 1;
  69                 } else if (!strcmp(cmd, "--git-dir")) {
  70                         if (*argc < 2) {
  71                                 fprintf(stderr, "No directory given for --git-dir.\n" );
  72                                 usage(git_usage_string);
  73                         }
  74                         setenv(GIT_DIR_ENVIRONMENT, (*argv)[1], 1);
  75                         if (envchanged)
  76                                 *envchanged = 1;
  77                         (*argv)++;
  78                         (*argc)--;
  79                         handled++;
  80                 } else if (!prefixcmp(cmd, "--git-dir=")) {
  81                         setenv(GIT_DIR_ENVIRONMENT, cmd + 10, 1);
  82                         if (envchanged)
  83                                 *envchanged = 1;
  84                 } else if (!strcmp(cmd, "--work-tree")) {
  85                         if (*argc < 2) {
  86                                 fprintf(stderr, "No directory given for --work-tree.\n" );
  87                                 usage(git_usage_string);
  88                         }
  89                         setenv(GIT_WORK_TREE_ENVIRONMENT, (*argv)[1], 1);
  90                         if (envchanged)
  91                                 *envchanged = 1;
  92                         (*argv)++;
  93                         (*argc)--;
  94                 } else if (!prefixcmp(cmd, "--work-tree=")) {
  95                         setenv(GIT_WORK_TREE_ENVIRONMENT, cmd + 12, 1);
  96                         if (envchanged)
  97                                 *envchanged = 1;
  98                 } else if (!strcmp(cmd, "--bare")) {
  99                         static char git_dir[PATH_MAX+1];
 100                         is_bare_repository_cfg = 1;
 101                         setenv(GIT_DIR_ENVIRONMENT, getcwd(git_dir, sizeof(git_dir)), 0);
 102                         if (envchanged)
 103                                 *envchanged = 1;
 104                 } else {
 105                         fprintf(stderr, "Unknown option: %s\n", cmd);
 106                         usage(git_usage_string);
 107                 }
 108
 109                 (*argv)++;
 110                 (*argc)--;
 111                 handled++;
 112         }
 113         return handled;
 114 }
 115
 116 static const char *alias_command;
 117 static char *alias_string;
 118
 119 static int git_alias_config(const char *var, const char *value)
 120 {
 121         if (!prefixcmp(var, "alias.") && !strcmp(var + 6, alias_command)) {
 122                 alias_string = xstrdup(value);
 123         }
 124         return 0;
 125 }
 126
 127 static int split_cmdline(char *cmdline, const char ***argv)
 128 {
 129         int src, dst, count = 0, size = 16;
 130         char quoted = 0;
 131
 132         *argv = xmalloc(sizeof(char*) * size);
 133
 134         /* split alias_string */
 135         (*argv)[count++] = cmdline;
 136         for (src = dst = 0; cmdline[src];) {
 137                 char c = cmdline[src];
 138                 if (!quoted && isspace(c)) {
 139                         cmdline[dst++] = 0;
 140                         while (cmdline[++src]
 141                                         && isspace(cmdline[src]))
 142                                 ; /* skip */
 143                         if (count >= size) {
 144                                 size += 16;
 145                                 *argv = xrealloc(*argv, sizeof(char*) * size);
 146                         }
 147                         (*argv)[count++] = cmdline + dst;
 148                 } else if(!quoted && (c == '\'' || c == '"')) {
 149                         quoted = c;
 150                         src++;
 151                 } else if (c == quoted) {
 152                         quoted = 0;
 153                         src++;
 154                 } else {
 155                         if (c == '\\' && quoted != '\'') {
 156                                 src++;
 157                                 c = cmdline[src];
 158                                 if (!c) {
 159                                         free(*argv);
 160                                         *argv = NULL;
 161                                         return error("cmdline ends with \\");
 162                                 }
 163                         }
 164                         cmdline[dst++] = c;
 165                         src++;
 166                 }
 167         }
 168
 169         cmdline[dst] = 0;
 170
 171         if (quoted) {
 172                 free(*argv);
 173                 *argv = NULL;
 174                 return error("unclosed quote");
 175         }
 176
 177         return count;
 178 }
 179
 180 static int handle_alias(int *argcp, const char ***argv)
 181 {
 182         int nongit = 0, envchanged = 0, ret = 0, saved_errno = errno;
 183         const char *subdir;
 184         int count, option_count;
 185         const char** new_argv;
 186
 187         subdir = setup_git_directory_gently(&nongit);
 188
 189         alias_command = (*argv)[0];
 190         git_config(git_alias_config);
 191         if (alias_string) {
 192                 if (alias_string[0] == '!') {
 193                         if (*argcp > 1) {
 194                                 int i, sz = PATH_MAX;
 195                                 char *s = xmalloc(sz), *new_alias = s;
 196
 197                                 add_to_string(&s, &sz, alias_string, 0);
 198                                 free(alias_string);
 199                                 alias_string = new_alias;
 200                                 for (i = 1; i < *argcp &&
 201                                         !add_to_string(&s, &sz, " ", 0) &&
 202                                         !add_to_string(&s, &sz, (*argv)[i], 1)
 203                                         ; i++)
 204                                         ; /* do nothing */
 205                                 if (!sz)
 206                                         die("Too many or long arguments");
 207                         }
 208                         trace_printf("trace: alias to shell cmd: %s => %s\n",
 209                                      alias_command, alias_string + 1);
 210                         ret = system(alias_string + 1);
 211                         if (ret >= 0 && WIFEXITED(ret) &&
 212                             WEXITSTATUS(ret) != 127)
 213                                 exit(WEXITSTATUS(ret));
 214                         die("Failed to run '%s' when expanding alias '%s'\n",
 215                             alias_string + 1, alias_command);
 216                 }
 217                 count = split_cmdline(alias_string, &new_argv);
 218                 option_count = handle_options(&new_argv, &count, &envchanged);
 219                 if (envchanged)
 220                         die("alias '%s' changes environment variables\n"
 221                                  "You can use '!git' in the alias to do this.",
 222                                  alias_command);
 223                 memmove(new_argv - option_count, new_argv,
 224                                 count * sizeof(char *));
 225                 new_argv -= option_count;
 226
 227                 if (count < 1)
 228                         die("empty alias for %s", alias_command);
 229
 230                 if (!strcmp(alias_command, new_argv[0]))
 231                         die("recursive alias: %s", alias_command);
 232
 233                 trace_argv_printf(new_argv, count,
 234                                   "trace: alias expansion: %s =>",
 235                                   alias_command);
 236
 237                 new_argv = xrealloc(new_argv, sizeof(char*) *
 238                                     (count + *argcp + 1));
 239                 /* insert after command name */
 240                 memcpy(new_argv + count, *argv + 1, sizeof(char*) * *argcp);
 241                 new_argv[count+*argcp] = NULL;
 242
 243                 *argv = new_argv;
 244                 *argcp += count - 1;
 245
 246                 ret = 1;
 247         }
 248
 249         if (subdir)
 250                 chdir(subdir);
 251
 252         errno = saved_errno;
 253
 254         return ret;
 255 }
 256
 257 const char git_version_string[] = GIT_VERSION;
 258
 259 #define RUN_SETUP       (1<<0)
 260 #define USE_PAGER       (1<<1)
 261 /*
 262  * require working tree to be present -- anything uses this needs
 263  * RUN_SETUP for reading from the configuration file.
 264  */
 265 #define NEED_WORK_TREE  (1<<2)
 266
 267 struct cmd_struct {
 268         const char *cmd;
 269         int (*fn)(int, const char **, const char *);
 270         int option;
 271 };
 272
 273 static int run_command(struct cmd_struct *p, int argc, const char **argv)
 274 {
 275         int status;
 276         struct stat st;
 277         const char *prefix;
 278
 279         prefix = NULL;
 280         if (p->option & RUN_SETUP)
 281                 prefix = setup_git_directory();
 282         if (p->option & USE_PAGER)
 283                 setup_pager();
 284         if (p->option & NEED_WORK_TREE) {
 285                 const char *work_tree = get_git_work_tree();
 286                 const char *git_dir = get_git_dir();
 287                 if (!is_absolute_path(git_dir))
 288                         set_git_dir(make_absolute_path(git_dir));
 289                 if (!work_tree || chdir(work_tree))
 290                         die("%s must be run in a work tree", p->cmd);
 291         }
 292         trace_argv_printf(argv, argc, "trace: built-in: git");
 293
 294         status = p->fn(argc, argv, prefix);
 295         if (status)
 296                 return status & 0xff;
 297
 298         /* Somebody closed stdout? */
 299         if (fstat(fileno(stdout), &st))
 300                 return 0;
 301         /* Ignore write errors for pipes and sockets.. */
 302         if (S_ISFIFO(st.st_mode) || S_ISSOCK(st.st_mode))
 303                 return 0;
 304
 305         /* Check for ENOSPC and EIO errors.. */
 306         if (fflush(stdout))
 307                 die("write failure on standard output: %s", strerror(errno));
 308         if (ferror(stdout))
 309                 die("unknown write failure on standard output");
 310         if (fclose(stdout))
 311                 die("close failed on standard output: %s", strerror(errno));
 312         return 0;
 313 }
 314
 315 static void handle_internal_command(int argc, const char **argv)
 316 {
 317         const char *cmd = argv[0];
 318         static struct cmd_struct commands[] = {
 319                 { "add", cmd_add, RUN_SETUP | NEED_WORK_TREE },
 320                 { "annotate", cmd_annotate, RUN_SETUP },
 321                 { "apply", cmd_apply },
 322                 { "archive", cmd_archive },
 323                 { "blame", cmd_blame, RUN_SETUP },
 324                 { "branch", cmd_branch, RUN_SETUP },
 325                 { "bundle", cmd_bundle },
 326                 { "cat-file", cmd_cat_file, RUN_SETUP },
 327                 { "checkout-index", cmd_checkout_index,
 328                         RUN_SETUP | NEED_WORK_TREE},
 329                 { "check-ref-format", cmd_check_ref_format },
 330                 { "check-attr", cmd_check_attr, RUN_SETUP | NEED_WORK_TREE },
 331                 { "cherry", cmd_cherry, RUN_SETUP },
 332                 { "cherry-pick", cmd_cherry_pick, RUN_SETUP | NEED_WORK_TREE },
 333                 { "commit-tree", cmd_commit_tree, RUN_SETUP },
 334                 { "config", cmd_config },
 335                 { "count-objects", cmd_count_objects, RUN_SETUP },
 336                 { "describe", cmd_describe, RUN_SETUP },
 337                 { "diff", cmd_diff },
 338                 { "diff-files", cmd_diff_files },
 339                 { "diff-index", cmd_diff_index, RUN_SETUP },
 340                 { "diff-tree", cmd_diff_tree, RUN_SETUP },
 341                 { "fetch--tool", cmd_fetch__tool, RUN_SETUP },
 342                 { "fmt-merge-msg", cmd_fmt_merge_msg, RUN_SETUP },
 343                 { "for-each-ref", cmd_for_each_ref, RUN_SETUP },
 344                 { "format-patch", cmd_format_patch, RUN_SETUP },
 345                 { "fsck", cmd_fsck, RUN_SETUP },
 346                 { "fsck-objects", cmd_fsck, RUN_SETUP },
 347                 { "gc", cmd_gc, RUN_SETUP },
 348                 { "get-tar-commit-id", cmd_get_tar_commit_id },
 349                 { "grep", cmd_grep, RUN_SETUP | USE_PAGER },
 350                 { "help", cmd_help },
 351                 { "init", cmd_init_db },
 352                 { "init-db", cmd_init_db },
 353                 { "log", cmd_log, RUN_SETUP | USE_PAGER },
 354                 { "ls-files", cmd_ls_files, RUN_SETUP },
 355                 { "ls-tree", cmd_ls_tree, RUN_SETUP },
 356                 { "mailinfo", cmd_mailinfo },
 357                 { "mailsplit", cmd_mailsplit },
 358                 { "merge-base", cmd_merge_base, RUN_SETUP },
 359                 { "merge-file", cmd_merge_file },
 360                 { "mv", cmd_mv, RUN_SETUP | NEED_WORK_TREE },
 361                 { "name-rev", cmd_name_rev, RUN_SETUP },
 362                 { "pack-objects", cmd_pack_objects, RUN_SETUP },
 363                 { "pickaxe", cmd_blame, RUN_SETUP },
 364                 { "prune", cmd_prune, RUN_SETUP },
 365                 { "prune-packed", cmd_prune_packed, RUN_SETUP },
 366                 { "push", cmd_push, RUN_SETUP },
 367                 { "read-tree", cmd_read_tree, RUN_SETUP },
 368                 { "reflog", cmd_reflog, RUN_SETUP },
 369                 { "repo-config", cmd_config },
 370                 { "rerere", cmd_rerere, RUN_SETUP },
 371                 { "rev-list", cmd_rev_list, RUN_SETUP },
 372                 { "rev-parse", cmd_rev_parse, RUN_SETUP },
 373                 { "revert", cmd_revert, RUN_SETUP | NEED_WORK_TREE },
 374                 { "rm", cmd_rm, RUN_SETUP | NEED_WORK_TREE },
 375                 { "runstatus", cmd_runstatus, RUN_SETUP | NEED_WORK_TREE },
 376                 { "shortlog", cmd_shortlog, RUN_SETUP | USE_PAGER },
 377                 { "show-branch", cmd_show_branch, RUN_SETUP },
 378                 { "show", cmd_show, RUN_SETUP | USE_PAGER },
 379                 { "stripspace", cmd_stripspace },
 380                 { "symbolic-ref", cmd_symbolic_ref, RUN_SETUP },
 381                 { "tag", cmd_tag, RUN_SETUP },
 382                 { "tar-tree", cmd_tar_tree },
 383                 { "unpack-objects", cmd_unpack_objects, RUN_SETUP },
 384                 { "update-index", cmd_update_index, RUN_SETUP },
 385                 { "update-ref", cmd_update_ref, RUN_SETUP },
 386                 { "upload-archive", cmd_upload_archive },
 387                 { "verify-tag", cmd_verify_tag, RUN_SETUP },
 388                 { "version", cmd_version },
 389                 { "whatchanged", cmd_whatchanged, RUN_SETUP | USE_PAGER },
 390                 { "write-tree", cmd_write_tree, RUN_SETUP },
 391                 { "verify-pack", cmd_verify_pack },
 392                 { "show-ref", cmd_show_ref, RUN_SETUP },
 393                 { "pack-refs", cmd_pack_refs, RUN_SETUP },
 394         };
 395         int i;
 396
 397 #ifdef STRIP_EXTENSION
 398         i = strlen(argv[0]) - strlen(STRIP_EXTENSION);
 399         if (i > 0 && !strcmp(argv[0] + i, STRIP_EXTENSION)) {
 400                 char *argv0 = strdup(argv[0]);
 401                 argv[0] = cmd = argv0;
 402                 argv0[i] = '\0';
 403         }
 404 #endif
 405
 406         /* Turn "git cmd --help" into "git help cmd" */
 407         if (argc > 1 && !strcmp(argv[1], "--help")) {
 408                 argv[1] = argv[0];
 409                 argv[0] = cmd = "help";
 410         }
 411
 412         for (i = 0; i < ARRAY_SIZE(commands); i++) {
 413                 struct cmd_struct *p = commands+i;
 414                 if (strcmp(p->cmd, cmd))
 415                         continue;
 416                 exit(run_command(p, argc, argv));
 417         }
 418 }
 419
 420 int main(int argc, const char **argv)
 421 {
 422         const char *cmd = argv[0] ? argv[0] : "git-help";
 423         char *slash = strrchr(cmd, '/');
 424         const char *exec_path = NULL;
 425         int done_alias = 0;
 426
 427         /*
 428          * Take the basename of argv[0] as the command
 429          * name, and the dirname as the default exec_path
 430          * if it's an absolute path and we don't have
 431          * anything better.
 432          */
 433 #ifdef __MINGW32__
 434         if (!slash)
 435                 slash = strrchr(cmd, '\\');
 436 #endif
 437         if (slash) {
 438                 *slash++ = 0;
 439                 if (is_absolute_path(cmd))
 440                         exec_path = cmd;
 441                 cmd = slash;
 442         }
 443
 444         /*
 445          * "git-xxxx" is the same as "git xxxx", but we obviously:
 446          *
 447          *  - cannot take flags in between the "git" and the "xxxx".
 448          *  - cannot execute it externally (since it would just do
 449          *    the same thing over again)
 450          *
 451          * So we just directly call the internal command handler, and
 452          * die if that one cannot handle it.
 453          */
 454         if (!prefixcmp(cmd, "git-")) {
 455                 cmd += 4;
 456                 argv[0] = cmd;
 457                 handle_internal_command(argc, argv);
 458                 die("cannot handle %s internally", cmd);
 459         }
 460
 461         /* Look for flags.. */
 462         argv++;
 463         argc--;
 464         handle_options(&argv, &argc, NULL);
 465         if (argc > 0) {
 466                 if (!prefixcmp(argv[0], "--"))
 467                         argv[0] += 2;
 468         } else {
 469                 /* Default command: "help" */
 470                 argv[0] = "help";
 471                 argc = 1;
 472         }
 473         cmd = argv[0];
 474
 475         /*
 476          * We execute external git command via execv_git_cmd(),
 477          * which looks at "--exec-path" option, GIT_EXEC_PATH
 478          * environment, and $(gitexecdir) in Makefile while built,
 479          * in this order.  For scripted commands, we prepend
 480          * the value of the exec_path variable to the PATH.
 481          */
 482         if (exec_path)
 483                 prepend_to_path(exec_path, strlen(exec_path));
 484         exec_path = git_exec_path();
 485         prepend_to_path(exec_path, strlen(exec_path));
 486
 487         while (1) {
 488                 /* See if it's an internal command */
 489                 handle_internal_command(argc, argv);
 490
 491                 /* .. then try the external ones */
 492                 execv_git_cmd(argv);
 493
 494                 /* It could be an alias -- this works around the insanity
 495                  * of overriding "git log" with "git show" by having
 496                  * alias.log = show
 497                  */
 498                 if (done_alias || !handle_alias(&argc, &argv))
 499                         break;
 500                 done_alias = 1;
 501         }
 502
 503         if (errno == ENOENT) {
 504                 if (done_alias) {
 505                         fprintf(stderr, "Expansion of alias '%s' failed; "
 506                                 "'%s' is not a git-command\n",
 507                                 cmd, argv[0]);
 508                         exit(1);
 509                 }
 510                 help_unknown_cmd(cmd);
 511         }
 512
 513         fprintf(stderr, "Failed to run command '%s': %s\n",
 514                 cmd, strerror(errno));
 515
 516         return 1;
 517 }