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 int handle_options(const char*** argv, int* argc, int* envchanged)
  10 {
  11         int handled = 0;
  12
  13         while (*argc > 0) {
  14                 const char *cmd = (*argv)[0];
  15                 if (cmd[0] != '-')
  16                         break;
  17
  18                 /*
  19                  * For legacy reasons, the "version" and "help"
  20                  * commands can be written with "--" prepended
  21                  * to make them look like flags.
  22                  */
  23                 if (!strcmp(cmd, "--help") || !strcmp(cmd, "--version"))
  24                         break;
  25
  26                 /*
  27                  * Check remaining flags.
  28                  */
  29                 if (!prefixcmp(cmd, "--exec-path")) {
  30                         cmd += 11;
  31                         if (*cmd == '=')
  32                                 git_set_argv_exec_path(cmd + 1);
  33                         else {
  34                                 puts(git_exec_path());
  35                                 exit(0);
  36                         }
  37                 } else if (!strcmp(cmd, "-p") || !strcmp(cmd, "--paginate")) {
  38                         setup_pager();
  39                 } else if (!strcmp(cmd, "--no-pager")) {
  40                         setenv("GIT_PAGER", "cat", 1);
  41                         if (envchanged)
  42                                 *envchanged = 1;
  43                 } else if (!strcmp(cmd, "--git-dir")) {
  44                         if (*argc < 2) {
  45                                 fprintf(stderr, "No directory given for --git-dir.\n" );
  46                                 usage(git_usage_string);
  47                         }
  48                         setenv(GIT_DIR_ENVIRONMENT, (*argv)[1], 1);
  49                         if (envchanged)
  50                                 *envchanged = 1;
  51                         (*argv)++;
  52                         (*argc)--;
  53                         handled++;
  54                 } else if (!prefixcmp(cmd, "--git-dir=")) {
  55                         setenv(GIT_DIR_ENVIRONMENT, cmd + 10, 1);
  56                         if (envchanged)
  57                                 *envchanged = 1;
  58                 } else if (!strcmp(cmd, "--work-tree")) {
  59                         if (*argc < 2) {
  60                                 fprintf(stderr, "No directory given for --work-tree.\n" );
  61                                 usage(git_usage_string);
  62                         }
  63                         setenv(GIT_WORK_TREE_ENVIRONMENT, (*argv)[1], 1);
  64                         if (envchanged)
  65                                 *envchanged = 1;
  66                         (*argv)++;
  67                         (*argc)--;
  68                 } else if (!prefixcmp(cmd, "--work-tree=")) {
  69                         setenv(GIT_WORK_TREE_ENVIRONMENT, cmd + 12, 1);
  70                         if (envchanged)
  71                                 *envchanged = 1;
  72                 } else if (!strcmp(cmd, "--bare")) {
  73                         static char git_dir[PATH_MAX+1];
  74                         is_bare_repository_cfg = 1;
  75                         setenv(GIT_DIR_ENVIRONMENT, getcwd(git_dir, sizeof(git_dir)), 0);
  76                         if (envchanged)
  77                                 *envchanged = 1;
  78                 } else {
  79                         fprintf(stderr, "Unknown option: %s\n", cmd);
  80                         usage(git_usage_string);
  81                 }
  82
  83                 (*argv)++;
  84                 (*argc)--;
  85                 handled++;
  86         }
  87         return handled;
  88 }
  89
  90 static const char *alias_command;
  91 static char *alias_string;
  92
  93 static int git_alias_config(const char *var, const char *value)
  94 {
  95         if (!prefixcmp(var, "alias.") && !strcmp(var + 6, alias_command)) {
  96                 if (!value)
  97                         return config_error_nonbool(var);
  98                 alias_string = xstrdup(value);
  99         }
 100         return 0;
 101 }
 102
 103 static int split_cmdline(char *cmdline, const char ***argv)
 104 {
 105         int src, dst, count = 0, size = 16;
 106         char quoted = 0;
 107
 108         *argv = xmalloc(sizeof(char*) * size);
 109
 110         /* split alias_string */
 111         (*argv)[count++] = cmdline;
 112         for (src = dst = 0; cmdline[src];) {
 113                 char c = cmdline[src];
 114                 if (!quoted && isspace(c)) {
 115                         cmdline[dst++] = 0;
 116                         while (cmdline[++src]
 117                                         && isspace(cmdline[src]))
 118                                 ; /* skip */
 119                         if (count >= size) {
 120                                 size += 16;
 121                                 *argv = xrealloc(*argv, sizeof(char*) * size);
 122                         }
 123                         (*argv)[count++] = cmdline + dst;
 124                 } else if(!quoted && (c == '\'' || c == '"')) {
 125                         quoted = c;
 126                         src++;
 127                 } else if (c == quoted) {
 128                         quoted = 0;
 129                         src++;
 130                 } else {
 131                         if (c == '\\' && quoted != '\'') {
 132                                 src++;
 133                                 c = cmdline[src];
 134                                 if (!c) {
 135                                         free(*argv);
 136                                         *argv = NULL;
 137                                         return error("cmdline ends with \\");
 138                                 }
 139                         }
 140                         cmdline[dst++] = c;
 141                         src++;
 142                 }
 143         }
 144
 145         cmdline[dst] = 0;
 146
 147         if (quoted) {
 148                 free(*argv);
 149                 *argv = NULL;
 150                 return error("unclosed quote");
 151         }
 152
 153         return count;
 154 }
 155
 156 static int handle_alias(int *argcp, const char ***argv)
 157 {
 158         int nongit = 0, envchanged = 0, ret = 0, saved_errno = errno;
 159         const char *subdir;
 160         int count, option_count;
 161         const char** new_argv;
 162
 163         subdir = setup_git_directory_gently(&nongit);
 164
 165         alias_command = (*argv)[0];
 166         git_config(git_alias_config);
 167         if (alias_string) {
 168                 if (alias_string[0] == '!') {
 169                         if (*argcp > 1) {
 170                                 struct strbuf buf;
 171
 172                                 strbuf_init(&buf, PATH_MAX);
 173                                 strbuf_addstr(&buf, alias_string);
 174                                 sq_quote_argv(&buf, (*argv) + 1, PATH_MAX);
 175                                 free(alias_string);
 176                                 alias_string = buf.buf;
 177                         }
 178                         trace_printf("trace: alias to shell cmd: %s => %s\n",
 179                                      alias_command, alias_string + 1);
 180                         ret = system(alias_string + 1);
 181                         if (ret >= 0 && WIFEXITED(ret) &&
 182                             WEXITSTATUS(ret) != 127)
 183                                 exit(WEXITSTATUS(ret));
 184                         die("Failed to run '%s' when expanding alias '%s'\n",
 185                             alias_string + 1, alias_command);
 186                 }
 187                 count = split_cmdline(alias_string, &new_argv);
 188                 option_count = handle_options(&new_argv, &count, &envchanged);
 189                 if (envchanged)
 190                         die("alias '%s' changes environment variables\n"
 191                                  "You can use '!git' in the alias to do this.",
 192                                  alias_command);
 193                 memmove(new_argv - option_count, new_argv,
 194                                 count * sizeof(char *));
 195                 new_argv -= option_count;
 196
 197                 if (count < 1)
 198                         die("empty alias for %s", alias_command);
 199
 200                 if (!strcmp(alias_command, new_argv[0]))
 201                         die("recursive alias: %s", alias_command);
 202
 203                 trace_argv_printf(new_argv,
 204                                   "trace: alias expansion: %s =>",
 205                                   alias_command);
 206
 207                 new_argv = xrealloc(new_argv, sizeof(char*) *
 208                                     (count + *argcp + 1));
 209                 /* insert after command name */
 210                 memcpy(new_argv + count, *argv + 1, sizeof(char*) * *argcp);
 211                 new_argv[count+*argcp] = NULL;
 212
 213                 *argv = new_argv;
 214                 *argcp += count - 1;
 215
 216                 ret = 1;
 217         }
 218
 219         if (subdir)
 220                 chdir(subdir);
 221
 222         errno = saved_errno;
 223
 224         return ret;
 225 }
 226
 227 const char git_version_string[] = GIT_VERSION;
 228
 229 #define RUN_SETUP       (1<<0)
 230 #define USE_PAGER       (1<<1)
 231 /*
 232  * require working tree to be present -- anything uses this needs
 233  * RUN_SETUP for reading from the configuration file.
 234  */
 235 #define NEED_WORK_TREE  (1<<2)
 236
 237 struct cmd_struct {
 238         const char *cmd;
 239         int (*fn)(int, const char **, const char *);
 240         int option;
 241 };
 242
 243 static int run_command(struct cmd_struct *p, int argc, const char **argv)
 244 {
 245         int status;
 246         struct stat st;
 247         const char *prefix;
 248
 249         prefix = NULL;
 250         if (p->option & RUN_SETUP)
 251                 prefix = setup_git_directory();
 252         if (p->option & USE_PAGER)
 253                 setup_pager();
 254         if (p->option & NEED_WORK_TREE)
 255                 setup_work_tree();
 256
 257         trace_argv_printf(argv, "trace: built-in: git");
 258
 259         status = p->fn(argc, argv, prefix);
 260         if (status)
 261                 return status & 0xff;
 262
 263         /* Somebody closed stdout? */
 264         if (fstat(fileno(stdout), &st))
 265                 return 0;
 266         /* Ignore write errors for pipes and sockets.. */
 267         if (S_ISFIFO(st.st_mode) || S_ISSOCK(st.st_mode))
 268                 return 0;
 269
 270         /* Check for ENOSPC and EIO errors.. */
 271         if (fflush(stdout))
 272                 die("write failure on standard output: %s", strerror(errno));
 273         if (ferror(stdout))
 274                 die("unknown write failure on standard output");
 275         if (fclose(stdout))
 276                 die("close failed on standard output: %s", strerror(errno));
 277         return 0;
 278 }
 279
 280 static void handle_internal_command(int argc, const char **argv)
 281 {
 282         const char *cmd = argv[0];
 283         static struct cmd_struct commands[] = {
 284                 { "add", cmd_add, RUN_SETUP | NEED_WORK_TREE },
 285                 { "annotate", cmd_annotate, RUN_SETUP },
 286                 { "apply", cmd_apply },
 287                 { "archive", cmd_archive },
 288                 { "blame", cmd_blame, RUN_SETUP },
 289                 { "branch", cmd_branch, RUN_SETUP },
 290                 { "bundle", cmd_bundle },
 291                 { "cat-file", cmd_cat_file, RUN_SETUP },
 292                 { "checkout-index", cmd_checkout_index,
 293                         RUN_SETUP | NEED_WORK_TREE},
 294                 { "check-ref-format", cmd_check_ref_format },
 295                 { "check-attr", cmd_check_attr, RUN_SETUP | NEED_WORK_TREE },
 296                 { "cherry", cmd_cherry, RUN_SETUP },
 297                 { "cherry-pick", cmd_cherry_pick, RUN_SETUP | NEED_WORK_TREE },
 298                 { "clean", cmd_clean, RUN_SETUP | NEED_WORK_TREE },
 299                 { "commit", cmd_commit, RUN_SETUP | NEED_WORK_TREE },
 300                 { "commit-tree", cmd_commit_tree, RUN_SETUP },
 301                 { "config", cmd_config },
 302                 { "count-objects", cmd_count_objects, RUN_SETUP },
 303                 { "describe", cmd_describe, RUN_SETUP },
 304                 { "diff", cmd_diff },
 305                 { "diff-files", cmd_diff_files },
 306                 { "diff-index", cmd_diff_index, RUN_SETUP },
 307                 { "diff-tree", cmd_diff_tree, RUN_SETUP },
 308                 { "fast-export", cmd_fast_export, RUN_SETUP },
 309                 { "fetch", cmd_fetch, RUN_SETUP },
 310                 { "fetch-pack", cmd_fetch_pack, RUN_SETUP },
 311                 { "fetch--tool", cmd_fetch__tool, RUN_SETUP },
 312                 { "fmt-merge-msg", cmd_fmt_merge_msg, RUN_SETUP },
 313                 { "for-each-ref", cmd_for_each_ref, RUN_SETUP },
 314                 { "format-patch", cmd_format_patch, RUN_SETUP },
 315                 { "fsck", cmd_fsck, RUN_SETUP },
 316                 { "fsck-objects", cmd_fsck, RUN_SETUP },
 317                 { "gc", cmd_gc, RUN_SETUP },
 318                 { "get-tar-commit-id", cmd_get_tar_commit_id },
 319                 { "grep", cmd_grep, RUN_SETUP | USE_PAGER },
 320                 { "help", cmd_help },
 321 #ifndef NO_CURL
 322                 { "http-fetch", cmd_http_fetch, RUN_SETUP },
 323 #endif
 324                 { "init", cmd_init_db },
 325                 { "init-db", cmd_init_db },
 326                 { "log", cmd_log, RUN_SETUP | USE_PAGER },
 327                 { "ls-files", cmd_ls_files, RUN_SETUP },
 328                 { "ls-tree", cmd_ls_tree, RUN_SETUP },
 329                 { "ls-remote", cmd_ls_remote },
 330                 { "mailinfo", cmd_mailinfo },
 331                 { "mailsplit", cmd_mailsplit },
 332                 { "merge-base", cmd_merge_base, RUN_SETUP },
 333                 { "merge-file", cmd_merge_file },
 334                 { "merge-ours", cmd_merge_ours, RUN_SETUP },
 335                 { "mv", cmd_mv, RUN_SETUP | NEED_WORK_TREE },
 336                 { "name-rev", cmd_name_rev, RUN_SETUP },
 337                 { "pack-objects", cmd_pack_objects, RUN_SETUP },
 338                 { "peek-remote", cmd_ls_remote },
 339                 { "pickaxe", cmd_blame, RUN_SETUP },
 340                 { "prune", cmd_prune, RUN_SETUP },
 341                 { "prune-packed", cmd_prune_packed, RUN_SETUP },
 342                 { "push", cmd_push, RUN_SETUP },
 343                 { "read-tree", cmd_read_tree, RUN_SETUP },
 344                 { "reflog", cmd_reflog, RUN_SETUP },
 345                 { "repo-config", cmd_config },
 346                 { "rerere", cmd_rerere, RUN_SETUP },
 347                 { "reset", cmd_reset, RUN_SETUP },
 348                 { "rev-list", cmd_rev_list, RUN_SETUP },
 349                 { "rev-parse", cmd_rev_parse },
 350                 { "revert", cmd_revert, RUN_SETUP | NEED_WORK_TREE },
 351                 { "rm", cmd_rm, RUN_SETUP },
 352                 { "send-pack", cmd_send_pack, RUN_SETUP },
 353                 { "shortlog", cmd_shortlog, RUN_SETUP | USE_PAGER },
 354                 { "show-branch", cmd_show_branch, RUN_SETUP },
 355                 { "show", cmd_show, RUN_SETUP | USE_PAGER },
 356                 { "status", cmd_status, RUN_SETUP | NEED_WORK_TREE },
 357                 { "stripspace", cmd_stripspace },
 358                 { "symbolic-ref", cmd_symbolic_ref, RUN_SETUP },
 359                 { "tag", cmd_tag, RUN_SETUP },
 360                 { "tar-tree", cmd_tar_tree },
 361                 { "unpack-objects", cmd_unpack_objects, RUN_SETUP },
 362                 { "update-index", cmd_update_index, RUN_SETUP },
 363                 { "update-ref", cmd_update_ref, RUN_SETUP },
 364                 { "upload-archive", cmd_upload_archive },
 365                 { "verify-tag", cmd_verify_tag, RUN_SETUP },
 366                 { "version", cmd_version },
 367                 { "whatchanged", cmd_whatchanged, RUN_SETUP | USE_PAGER },
 368                 { "write-tree", cmd_write_tree, RUN_SETUP },
 369                 { "verify-pack", cmd_verify_pack },
 370                 { "show-ref", cmd_show_ref, RUN_SETUP },
 371                 { "pack-refs", cmd_pack_refs, RUN_SETUP },
 372         };
 373         int i;
 374
 375         /* Turn "git cmd --help" into "git help cmd" */
 376         if (argc > 1 && !strcmp(argv[1], "--help")) {
 377                 argv[1] = argv[0];
 378                 argv[0] = cmd = "help";
 379         }
 380
 381         for (i = 0; i < ARRAY_SIZE(commands); i++) {
 382                 struct cmd_struct *p = commands+i;
 383                 if (strcmp(p->cmd, cmd))
 384                         continue;
 385                 exit(run_command(p, argc, argv));
 386         }
 387 }
 388
 389 int main(int argc, const char **argv)
 390 {
 391         const char *cmd = argv[0] ? argv[0] : "git-help";
 392         char *slash = strrchr(cmd, '/');
 393         const char *cmd_path = NULL;
 394         int done_alias = 0;
 395
 396         /*
 397          * Take the basename of argv[0] as the command
 398          * name, and the dirname as the default exec_path
 399          * if we don't have anything better.
 400          */
 401         if (slash) {
 402                 *slash++ = 0;
 403                 cmd_path = cmd;
 404                 cmd = slash;
 405         }
 406
 407         /*
 408          * "git-xxxx" is the same as "git xxxx", but we obviously:
 409          *
 410          *  - cannot take flags in between the "git" and the "xxxx".
 411          *  - cannot execute it externally (since it would just do
 412          *    the same thing over again)
 413          *
 414          * So we just directly call the internal command handler, and
 415          * die if that one cannot handle it.
 416          */
 417         if (!prefixcmp(cmd, "git-")) {
 418                 cmd += 4;
 419                 argv[0] = cmd;
 420                 handle_internal_command(argc, argv);
 421                 die("cannot handle %s internally", cmd);
 422         }
 423
 424         /* Look for flags.. */
 425         argv++;
 426         argc--;
 427         handle_options(&argv, &argc, NULL);
 428         if (argc > 0) {
 429                 if (!prefixcmp(argv[0], "--"))
 430                         argv[0] += 2;
 431         } else {
 432                 /* The user didn't specify a command; give them help */
 433                 printf("usage: %s\n\n", git_usage_string);
 434                 list_common_cmds_help();
 435                 exit(1);
 436         }
 437         cmd = argv[0];
 438
 439         /*
 440          * We use PATH to find git commands, but we prepend some higher
 441          * precidence paths: the "--exec-path" option, the GIT_EXEC_PATH
 442          * environment, and the $(gitexecdir) from the Makefile at build
 443          * time.
 444          */
 445         setup_path(cmd_path);
 446
 447         while (1) {
 448                 /* See if it's an internal command */
 449                 handle_internal_command(argc, argv);
 450
 451                 /* .. then try the external ones */
 452                 execv_git_cmd(argv);
 453
 454                 /* It could be an alias -- this works around the insanity
 455                  * of overriding "git log" with "git show" by having
 456                  * alias.log = show
 457                  */
 458                 if (done_alias || !handle_alias(&argc, &argv))
 459                         break;
 460                 done_alias = 1;
 461         }
 462
 463         if (errno == ENOENT) {
 464                 if (done_alias) {
 465                         fprintf(stderr, "Expansion of alias '%s' failed; "
 466                                 "'%s' is not a git-command\n",
 467                                 cmd, argv[0]);
 468                         exit(1);
 469                 }
 470                 help_unknown_cmd(cmd);
 471         }
 472
 473         fprintf(stderr, "Failed to run command '%s': %s\n",
 474                 cmd, strerror(errno));
 475
 476         return 1;
 477 }