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] [--bare] [--git-dir=GIT_DIR] [--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)
  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, "--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                         (*argv)++;
  72                         (*argc)--;
  73                         handled++;
  74                 } else if (!prefixcmp(cmd, "--git-dir=")) {
  75                         setenv(GIT_DIR_ENVIRONMENT, cmd + 10, 1);
  76                 } else if (!strcmp(cmd, "--bare")) {
  77                         static char git_dir[PATH_MAX+1];
  78                         setenv(GIT_DIR_ENVIRONMENT, getcwd(git_dir, sizeof(git_dir)), 1);
  79                 } else {
  80                         fprintf(stderr, "Unknown option: %s\n", cmd);
  81                         usage(git_usage_string);
  82                 }
  83
  84                 (*argv)++;
  85                 (*argc)--;
  86                 handled++;
  87         }
  88         return handled;
  89 }
  90
  91 static const char *alias_command;
  92 static char *alias_string;
  93
  94 static int git_alias_config(const char *var, const char *value)
  95 {
  96         if (!prefixcmp(var, "alias.") && !strcmp(var + 6, alias_command)) {
  97                 alias_string = xstrdup(value);
  98         }
  99         return 0;
 100 }
 101
 102 static int split_cmdline(char *cmdline, const char ***argv)
 103 {
 104         int src, dst, count = 0, size = 16;
 105         char quoted = 0;
 106
 107         *argv = xmalloc(sizeof(char*) * size);
 108
 109         /* split alias_string */
 110         (*argv)[count++] = cmdline;
 111         for (src = dst = 0; cmdline[src];) {
 112                 char c = cmdline[src];
 113                 if (!quoted && isspace(c)) {
 114                         cmdline[dst++] = 0;
 115                         while (cmdline[++src]
 116                                         && isspace(cmdline[src]))
 117                                 ; /* skip */
 118                         if (count >= size) {
 119                                 size += 16;
 120                                 *argv = xrealloc(*argv, sizeof(char*) * size);
 121                         }
 122                         (*argv)[count++] = cmdline + dst;
 123                 } else if(!quoted && (c == '\'' || c == '"')) {
 124                         quoted = c;
 125                         src++;
 126                 } else if (c == quoted) {
 127                         quoted = 0;
 128                         src++;
 129                 } else {
 130                         if (c == '\\' && quoted != '\'') {
 131                                 src++;
 132                                 c = cmdline[src];
 133                                 if (!c) {
 134                                         free(*argv);
 135                                         *argv = NULL;
 136                                         return error("cmdline ends with \\");
 137                                 }
 138                         }
 139                         cmdline[dst++] = c;
 140                         src++;
 141                 }
 142         }
 143
 144         cmdline[dst] = 0;
 145
 146         if (quoted) {
 147                 free(*argv);
 148                 *argv = NULL;
 149                 return error("unclosed quote");
 150         }
 151
 152         return count;
 153 }
 154
 155 static int handle_alias(int *argcp, const char ***argv)
 156 {
 157         int nongit = 0, ret = 0, saved_errno = errno;
 158         const char *subdir;
 159         int count, option_count;
 160         const char** new_argv;
 161
 162         subdir = setup_git_directory_gently(&nongit);
 163
 164         alias_command = (*argv)[0];
 165         git_config(git_alias_config);
 166         if (alias_string) {
 167                 if (alias_string[0] == '!') {
 168                         trace_printf("trace: alias to shell cmd: %s => %s\n",
 169                                      alias_command, alias_string + 1);
 170                         ret = system(alias_string + 1);
 171                         if (ret >= 0 && WIFEXITED(ret) &&
 172                             WEXITSTATUS(ret) != 127)
 173                                 exit(WEXITSTATUS(ret));
 174                         die("Failed to run '%s' when expanding alias '%s'\n",
 175                             alias_string + 1, alias_command);
 176                 }
 177                 count = split_cmdline(alias_string, &new_argv);
 178                 option_count = handle_options(&new_argv, &count);
 179                 memmove(new_argv - option_count, new_argv,
 180                                 count * sizeof(char *));
 181                 new_argv -= option_count;
 182
 183                 if (count < 1)
 184                         die("empty alias for %s", alias_command);
 185
 186                 if (!strcmp(alias_command, new_argv[0]))
 187                         die("recursive alias: %s", alias_command);
 188
 189                 trace_argv_printf(new_argv, count,
 190                                   "trace: alias expansion: %s =>",
 191                                   alias_command);
 192
 193                 new_argv = xrealloc(new_argv, sizeof(char*) *
 194                                     (count + *argcp + 1));
 195                 /* insert after command name */
 196                 memcpy(new_argv + count, *argv + 1, sizeof(char*) * *argcp);
 197                 new_argv[count+*argcp] = NULL;
 198
 199                 *argv = new_argv;
 200                 *argcp += count - 1;
 201
 202                 ret = 1;
 203         }
 204
 205         if (subdir)
 206                 chdir(subdir);
 207
 208         errno = saved_errno;
 209
 210         return ret;
 211 }
 212
 213 const char git_version_string[] = GIT_VERSION;
 214
 215 #define RUN_SETUP       (1<<0)
 216 #define USE_PAGER       (1<<1)
 217 /*
 218  * require working tree to be present -- anything uses this needs
 219  * RUN_SETUP for reading from the configuration file.
 220  */
 221 #define NOT_BARE        (1<<2)
 222
 223 static void handle_internal_command(int argc, const char **argv, char **envp)
 224 {
 225         const char *cmd = argv[0];
 226         static struct cmd_struct {
 227                 const char *cmd;
 228                 int (*fn)(int, const char **, const char *);
 229                 int option;
 230         } commands[] = {
 231                 { "add", cmd_add, RUN_SETUP | NOT_BARE },
 232                 { "annotate", cmd_annotate, USE_PAGER },
 233                 { "apply", cmd_apply },
 234                 { "archive", cmd_archive },
 235                 { "blame", cmd_blame, RUN_SETUP },
 236                 { "branch", cmd_branch, RUN_SETUP },
 237                 { "bundle", cmd_bundle },
 238                 { "cat-file", cmd_cat_file, RUN_SETUP },
 239                 { "checkout-index", cmd_checkout_index, RUN_SETUP },
 240                 { "check-ref-format", cmd_check_ref_format },
 241                 { "cherry", cmd_cherry, RUN_SETUP },
 242                 { "cherry-pick", cmd_cherry_pick, RUN_SETUP | NOT_BARE },
 243                 { "commit-tree", cmd_commit_tree, RUN_SETUP },
 244                 { "config", cmd_config },
 245                 { "count-objects", cmd_count_objects, RUN_SETUP },
 246                 { "describe", cmd_describe, RUN_SETUP },
 247                 { "diff", cmd_diff, USE_PAGER },
 248                 { "diff-files", cmd_diff_files },
 249                 { "diff-index", cmd_diff_index, RUN_SETUP },
 250                 { "diff-tree", cmd_diff_tree, RUN_SETUP },
 251                 { "fetch--tool", cmd_fetch__tool, RUN_SETUP },
 252                 { "fmt-merge-msg", cmd_fmt_merge_msg, RUN_SETUP },
 253                 { "for-each-ref", cmd_for_each_ref, RUN_SETUP },
 254                 { "format-patch", cmd_format_patch, RUN_SETUP },
 255                 { "fsck", cmd_fsck, RUN_SETUP },
 256                 { "fsck-objects", cmd_fsck, RUN_SETUP },
 257                 { "gc", cmd_gc, RUN_SETUP },
 258                 { "get-tar-commit-id", cmd_get_tar_commit_id },
 259                 { "grep", cmd_grep, RUN_SETUP | USE_PAGER },
 260                 { "help", cmd_help },
 261                 { "init", cmd_init_db },
 262                 { "init-db", cmd_init_db },
 263                 { "log", cmd_log, RUN_SETUP | USE_PAGER },
 264                 { "ls-files", cmd_ls_files, RUN_SETUP },
 265                 { "ls-tree", cmd_ls_tree, RUN_SETUP },
 266                 { "mailinfo", cmd_mailinfo },
 267                 { "mailsplit", cmd_mailsplit },
 268                 { "merge-base", cmd_merge_base, RUN_SETUP },
 269                 { "merge-file", cmd_merge_file },
 270                 { "mv", cmd_mv, RUN_SETUP | NOT_BARE },
 271                 { "name-rev", cmd_name_rev, RUN_SETUP },
 272                 { "pack-objects", cmd_pack_objects, RUN_SETUP },
 273                 { "pickaxe", cmd_blame, RUN_SETUP | USE_PAGER },
 274                 { "prune", cmd_prune, RUN_SETUP },
 275                 { "prune-packed", cmd_prune_packed, RUN_SETUP },
 276                 { "push", cmd_push, RUN_SETUP },
 277                 { "read-tree", cmd_read_tree, RUN_SETUP },
 278                 { "reflog", cmd_reflog, RUN_SETUP },
 279                 { "repo-config", cmd_config },
 280                 { "rerere", cmd_rerere, RUN_SETUP },
 281                 { "rev-list", cmd_rev_list, RUN_SETUP },
 282                 { "rev-parse", cmd_rev_parse, RUN_SETUP },
 283                 { "revert", cmd_revert, RUN_SETUP | NOT_BARE },
 284                 { "rm", cmd_rm, RUN_SETUP | NOT_BARE },
 285                 { "runstatus", cmd_runstatus, RUN_SETUP | NOT_BARE },
 286                 { "shortlog", cmd_shortlog, RUN_SETUP | USE_PAGER },
 287                 { "show-branch", cmd_show_branch, RUN_SETUP },
 288                 { "show", cmd_show, RUN_SETUP | USE_PAGER },
 289                 { "stripspace", cmd_stripspace },
 290                 { "symbolic-ref", cmd_symbolic_ref, RUN_SETUP },
 291                 { "tar-tree", cmd_tar_tree },
 292                 { "unpack-objects", cmd_unpack_objects, RUN_SETUP },
 293                 { "update-index", cmd_update_index, RUN_SETUP },
 294                 { "update-ref", cmd_update_ref, RUN_SETUP },
 295                 { "upload-archive", cmd_upload_archive },
 296                 { "version", cmd_version },
 297                 { "whatchanged", cmd_whatchanged, RUN_SETUP | USE_PAGER },
 298                 { "write-tree", cmd_write_tree, RUN_SETUP },
 299                 { "verify-pack", cmd_verify_pack },
 300                 { "show-ref", cmd_show_ref, RUN_SETUP },
 301                 { "pack-refs", cmd_pack_refs, RUN_SETUP },
 302         };
 303         int i;
 304
 305 #ifdef STRIP_EXTENSION
 306         i = strlen(argv[0]) - strlen(STRIP_EXTENSION);
 307         if (i > 0 && !strcmp(argv[0] + i, STRIP_EXTENSION)) {
 308                 char *argv0 = strdup(argv[0]);
 309                 argv[0] = cmd = argv0;
 310                 argv0[i] = '\0';
 311         }
 312 #endif
 313
 314         /* Turn "git cmd --help" into "git help cmd" */
 315         if (argc > 1 && !strcmp(argv[1], "--help")) {
 316                 argv[1] = argv[0];
 317                 argv[0] = cmd = "help";
 318         }
 319
 320         for (i = 0; i < ARRAY_SIZE(commands); i++) {
 321                 struct cmd_struct *p = commands+i;
 322                 const char *prefix;
 323                 if (strcmp(p->cmd, cmd))
 324                         continue;
 325
 326                 prefix = NULL;
 327                 if (p->option & RUN_SETUP)
 328                         prefix = setup_git_directory();
 329                 if (p->option & USE_PAGER)
 330                         setup_pager();
 331                 if ((p->option & NOT_BARE) &&
 332                                 (is_bare_repository() || is_inside_git_dir()))
 333                         die("%s must be run in a work tree", cmd);
 334                 trace_argv_printf(argv, argc, "trace: built-in: git");
 335
 336                 exit(p->fn(argc, argv, prefix));
 337         }
 338 }
 339
 340 int main(int argc, const char **argv, char **envp)
 341 {
 342         const char *cmd = argv[0] ? argv[0] : "git-help";
 343         char *slash = strrchr(cmd, '/');
 344         const char *exec_path = NULL;
 345         int done_alias = 0;
 346
 347         /*
 348          * Take the basename of argv[0] as the command
 349          * name, and the dirname as the default exec_path
 350          * if it's an absolute path and we don't have
 351          * anything better.
 352          */
 353         if (slash) {
 354                 *slash++ = 0;
 355                 if (*cmd == '/')
 356                         exec_path = cmd;
 357                 cmd = slash;
 358         }
 359
 360 #ifdef __MINGW32__
 361         slash = strrchr(cmd, '\\');
 362         if (slash) {
 363                 *slash++ = 0;
 364                 if (cmd[1] == ':')
 365                         exec_path = cmd;
 366                 cmd = slash;
 367         }
 368 #endif
 369
 370         /*
 371          * "git-xxxx" is the same as "git xxxx", but we obviously:
 372          *
 373          *  - cannot take flags in between the "git" and the "xxxx".
 374          *  - cannot execute it externally (since it would just do
 375          *    the same thing over again)
 376          *
 377          * So we just directly call the internal command handler, and
 378          * die if that one cannot handle it.
 379          */
 380         if (!prefixcmp(cmd, "git-")) {
 381                 cmd += 4;
 382                 argv[0] = cmd;
 383                 handle_internal_command(argc, argv, envp);
 384                 die("cannot handle %s internally", cmd);
 385         }
 386
 387         /* Look for flags.. */
 388         argv++;
 389         argc--;
 390         handle_options(&argv, &argc);
 391         if (argc > 0) {
 392                 if (!prefixcmp(argv[0], "--"))
 393                         argv[0] += 2;
 394         } else {
 395                 /* Default command: "help" */
 396                 argv[0] = "help";
 397                 argc = 1;
 398         }
 399         cmd = argv[0];
 400
 401         /*
 402          * We search for git commands in the following order:
 403          *  - git_exec_path()
 404          *  - the path of the "git" command if we could find it
 405          *    in $0
 406          *  - the regular PATH.
 407          */
 408         if (exec_path)
 409                 prepend_to_path(exec_path, strlen(exec_path));
 410         exec_path = git_exec_path();
 411         prepend_to_path(exec_path, strlen(exec_path));
 412
 413         while (1) {
 414                 /* See if it's an internal command */
 415                 handle_internal_command(argc, argv, envp);
 416
 417                 /* .. then try the external ones */
 418                 execv_git_cmd(argv);
 419
 420                 /* It could be an alias -- this works around the insanity
 421                  * of overriding "git log" with "git show" by having
 422                  * alias.log = show
 423                  */
 424                 if (done_alias || !handle_alias(&argc, &argv))
 425                         break;
 426                 done_alias = 1;
 427         }
 428
 429         if (errno == ENOENT) {
 430                 if (done_alias) {
 431                         fprintf(stderr, "Expansion of alias '%s' failed; "
 432                                 "'%s' is not a git-command\n",
 433                                 cmd, argv[0]);
 434                         exit(1);
 435                 }
 436                 help_unknown_cmd(cmd);
 437         }
 438
 439         fprintf(stderr, "Failed to run command '%s': %s\n",
 440                 cmd, strerror(errno));
 441
 442         return 1;
 443 }