git.c

   1 #include "builtin.h"
   2 #include "exec_cmd.h"
   3 #include "cache.h"
   4 #include "quote.h"
   5 #include "run-command.h"
   6
   7 const char git_usage_string[] =
   8         "git [--version] [--exec-path[=GIT_EXEC_PATH]] [--html-path]\n"
   9         "           [-p|--paginate|--no-pager] [--no-replace-objects]\n"
  10         "           [--bare] [--git-dir=GIT_DIR] [--work-tree=GIT_WORK_TREE]\n"
  11         "           [-c name=value] [--help]\n"
  12         "           COMMAND [ARGS]";
  13
  14 const char git_more_info_string[] =
  15         "See 'git help COMMAND' for more information on a specific command.";
  16
  17 static int use_pager = -1;
  18 struct pager_config {
  19         const char *cmd;
  20         int val;
  21 };
  22
  23 static int pager_command_config(const char *var, const char *value, void *data)
  24 {
  25         struct pager_config *c = data;
  26         if (!prefixcmp(var, "pager.") && !strcmp(var + 6, c->cmd))
  27                 c->val = git_config_bool(var, value);
  28         return 0;
  29 }
  30
  31 /* returns 0 for "no pager", 1 for "use pager", and -1 for "not specified" */
  32 int check_pager_config(const char *cmd)
  33 {
  34         struct pager_config c;
  35         c.cmd = cmd;
  36         c.val = -1;
  37         git_config(pager_command_config, &c);
  38         return c.val;
  39 }
  40
  41 static void commit_pager_choice(void) {
  42         switch (use_pager) {
  43         case 0:
  44                 setenv("GIT_PAGER", "cat", 1);
  45                 break;
  46         case 1:
  47                 setup_pager();
  48                 break;
  49         default:
  50                 break;
  51         }
  52 }
  53
  54 static int handle_options(const char ***argv, int *argc, int *envchanged)
  55 {
  56         int handled = 0;
  57
  58         if (!getenv("GIT_ASKPASS") && getenv("SSH_ASKPASS"))
  59                 setenv("GIT_ASKPASS", getenv("SSH_ASKPASS"), 1);
  60
  61         while (*argc > 0) {
  62                 const char *cmd = (*argv)[0];
  63                 if (cmd[0] != '-')
  64                         break;
  65
  66                 /*
  67                  * For legacy reasons, the "version" and "help"
  68                  * commands can be written with "--" prepended
  69                  * to make them look like flags.
  70                  */
  71                 if (!strcmp(cmd, "--help") || !strcmp(cmd, "--version"))
  72                         break;
  73
  74                 /*
  75                  * Check remaining flags.
  76                  */
  77                 if (!prefixcmp(cmd, "--exec-path")) {
  78                         cmd += 11;
  79                         if (*cmd == '=')
  80                                 git_set_argv_exec_path(cmd + 1);
  81                         else {
  82                                 puts(git_exec_path());
  83                                 exit(0);
  84                         }
  85                 } else if (!strcmp(cmd, "--html-path")) {
  86                         puts(system_path(GIT_HTML_PATH));
  87                         exit(0);
  88                 } else if (!strcmp(cmd, "-p") || !strcmp(cmd, "--paginate")) {
  89                         use_pager = 1;
  90                 } else if (!strcmp(cmd, "--no-pager")) {
  91                         use_pager = 0;
  92                         if (envchanged)
  93                                 *envchanged = 1;
  94                 } else if (!strcmp(cmd, "--no-replace-objects")) {
  95                         read_replace_refs = 0;
  96                         setenv(NO_REPLACE_OBJECTS_ENVIRONMENT, "1", 1);
  97                         if (envchanged)
  98                                 *envchanged = 1;
  99                 } else if (!strcmp(cmd, "--git-dir")) {
 100                         if (*argc < 2) {
 101                                 fprintf(stderr, "No directory given for --git-dir.\n" );
 102                                 usage(git_usage_string);
 103                         }
 104                         setenv(GIT_DIR_ENVIRONMENT, (*argv)[1], 1);
 105                         if (envchanged)
 106                                 *envchanged = 1;
 107                         (*argv)++;
 108                         (*argc)--;
 109                         handled++;
 110                 } else if (!prefixcmp(cmd, "--git-dir=")) {
 111                         setenv(GIT_DIR_ENVIRONMENT, cmd + 10, 1);
 112                         if (envchanged)
 113                                 *envchanged = 1;
 114                 } else if (!strcmp(cmd, "--work-tree")) {
 115                         if (*argc < 2) {
 116                                 fprintf(stderr, "No directory given for --work-tree.\n" );
 117                                 usage(git_usage_string);
 118                         }
 119                         setenv(GIT_WORK_TREE_ENVIRONMENT, (*argv)[1], 1);
 120                         if (envchanged)
 121                                 *envchanged = 1;
 122                         (*argv)++;
 123                         (*argc)--;
 124                 } else if (!prefixcmp(cmd, "--work-tree=")) {
 125                         setenv(GIT_WORK_TREE_ENVIRONMENT, cmd + 12, 1);
 126                         if (envchanged)
 127                                 *envchanged = 1;
 128                 } else if (!strcmp(cmd, "--bare")) {
 129                         static char git_dir[PATH_MAX+1];
 130                         is_bare_repository_cfg = 1;
 131                         setenv(GIT_DIR_ENVIRONMENT, getcwd(git_dir, sizeof(git_dir)), 0);
 132                         if (envchanged)
 133                                 *envchanged = 1;
 134                 } else if (!strcmp(cmd, "-c")) {
 135                         if (*argc < 2) {
 136                                 fprintf(stderr, "-c expects a configuration string\n" );
 137                                 usage(git_usage_string);
 138                         }
 139                         git_config_parse_parameter((*argv)[1]);
 140                         (*argv)++;
 141                         (*argc)--;
 142                 } else {
 143                         fprintf(stderr, "Unknown option: %s\n", cmd);
 144                         usage(git_usage_string);
 145                 }
 146
 147                 (*argv)++;
 148                 (*argc)--;
 149                 handled++;
 150         }
 151         return handled;
 152 }
 153
 154 static int handle_alias(int *argcp, const char ***argv)
 155 {
 156         int envchanged = 0, ret = 0, saved_errno = errno;
 157         const char *subdir;
 158         int count, option_count;
 159         const char **new_argv;
 160         const char *alias_command;
 161         char *alias_string;
 162         int unused_nongit;
 163
 164         subdir = setup_git_directory_gently(&unused_nongit);
 165
 166         alias_command = (*argv)[0];
 167         alias_string = alias_lookup(alias_command);
 168         if (alias_string) {
 169                 if (alias_string[0] == '!') {
 170                         commit_pager_choice();
 171                         if (*argcp > 1) {
 172                                 struct strbuf buf;
 173
 174                                 strbuf_init(&buf, PATH_MAX);
 175                                 strbuf_addstr(&buf, alias_string);
 176                                 sq_quote_argv(&buf, (*argv) + 1, PATH_MAX);
 177                                 free(alias_string);
 178                                 alias_string = buf.buf;
 179                         }
 180                         trace_printf("trace: alias to shell cmd: %s => %s\n",
 181                                      alias_command, alias_string + 1);
 182                         ret = system(alias_string + 1);
 183                         if (ret >= 0 && WIFEXITED(ret) &&
 184                             WEXITSTATUS(ret) != 127)
 185                                 exit(WEXITSTATUS(ret));
 186                         die("Failed to run '%s' when expanding alias '%s'",
 187                             alias_string + 1, alias_command);
 188                 }
 189                 count = split_cmdline(alias_string, &new_argv);
 190                 if (count < 0)
 191                         die("Bad alias.%s string", alias_command);
 192                 option_count = handle_options(&new_argv, &count, &envchanged);
 193                 if (envchanged)
 194                         die("alias '%s' changes environment variables\n"
 195                                  "You can use '!git' in the alias to do this.",
 196                                  alias_command);
 197                 memmove(new_argv - option_count, new_argv,
 198                                 count * sizeof(char *));
 199                 new_argv -= option_count;
 200
 201                 if (count < 1)
 202                         die("empty alias for %s", alias_command);
 203
 204                 if (!strcmp(alias_command, new_argv[0]))
 205                         die("recursive alias: %s", alias_command);
 206
 207                 trace_argv_printf(new_argv,
 208                                   "trace: alias expansion: %s =>",
 209                                   alias_command);
 210
 211                 new_argv = xrealloc(new_argv, sizeof(char *) *
 212                                     (count + *argcp));
 213                 /* insert after command name */
 214                 memcpy(new_argv + count, *argv + 1, sizeof(char *) * *argcp);
 215
 216                 *argv = new_argv;
 217                 *argcp += count - 1;
 218
 219                 ret = 1;
 220         }
 221
 222         if (subdir && chdir(subdir))
 223                 die_errno("Cannot change to '%s'", subdir);
 224
 225         errno = saved_errno;
 226
 227         return ret;
 228 }
 229
 230 const char git_version_string[] = GIT_VERSION;
 231
 232 #define RUN_SETUP       (1<<0)
 233 #define USE_PAGER       (1<<1)
 234 /*
 235  * require working tree to be present -- anything uses this needs
 236  * RUN_SETUP for reading from the configuration file.
 237  */
 238 #define NEED_WORK_TREE  (1<<2)
 239
 240 struct cmd_struct {
 241         const char *cmd;
 242         int (*fn)(int, const char **, const char *);
 243         int option;
 244 };
 245
 246 static int run_builtin(struct cmd_struct *p, int argc, const char **argv)
 247 {
 248         int status, help;
 249         struct stat st;
 250         const char *prefix;
 251
 252         prefix = NULL;
 253         help = argc == 2 && !strcmp(argv[1], "-h");
 254         if (!help) {
 255                 if (p->option & RUN_SETUP)
 256                         prefix = setup_git_directory();
 257
 258                 if (use_pager == -1 && p->option & RUN_SETUP)
 259                         use_pager = check_pager_config(p->cmd);
 260                 if (use_pager == -1 && p->option & USE_PAGER)
 261                         use_pager = 1;
 262         }
 263         commit_pager_choice();
 264
 265         if (!help && p->option & NEED_WORK_TREE)
 266                 setup_work_tree();
 267
 268         trace_argv_printf(argv, "trace: built-in: git");
 269
 270         status = p->fn(argc, argv, prefix);
 271         if (status)
 272                 return status;
 273
 274         /* Somebody closed stdout? */
 275         if (fstat(fileno(stdout), &st))
 276                 return 0;
 277         /* Ignore write errors for pipes and sockets.. */
 278         if (S_ISFIFO(st.st_mode) || S_ISSOCK(st.st_mode))
 279                 return 0;
 280
 281         /* Check for ENOSPC and EIO errors.. */
 282         if (fflush(stdout))
 283                 die_errno("write failure on standard output");
 284         if (ferror(stdout))
 285                 die("unknown write failure on standard output");
 286         if (fclose(stdout))
 287                 die_errno("close failed on standard output");
 288         return 0;
 289 }
 290
 291 static void handle_internal_command(int argc, const char **argv)
 292 {
 293         const char *cmd = argv[0];
 294         static struct cmd_struct commands[] = {
 295                 { "add", cmd_add, RUN_SETUP | NEED_WORK_TREE },
 296                 { "stage", cmd_add, RUN_SETUP | NEED_WORK_TREE },
 297                 { "annotate", cmd_annotate, RUN_SETUP },
 298                 { "apply", cmd_apply },
 299                 { "archive", cmd_archive },
 300                 { "bisect--helper", cmd_bisect__helper, RUN_SETUP | NEED_WORK_TREE },
 301                 { "blame", cmd_blame, RUN_SETUP },
 302                 { "branch", cmd_branch, RUN_SETUP },
 303                 { "bundle", cmd_bundle },
 304                 { "cat-file", cmd_cat_file, RUN_SETUP },
 305                 { "checkout", cmd_checkout, RUN_SETUP | NEED_WORK_TREE },
 306                 { "checkout-index", cmd_checkout_index,
 307                         RUN_SETUP | NEED_WORK_TREE},
 308                 { "check-ref-format", cmd_check_ref_format },
 309                 { "check-attr", cmd_check_attr, RUN_SETUP },
 310                 { "cherry", cmd_cherry, RUN_SETUP },
 311                 { "cherry-pick", cmd_cherry_pick, RUN_SETUP | NEED_WORK_TREE },
 312                 { "clone", cmd_clone },
 313                 { "clean", cmd_clean, RUN_SETUP | NEED_WORK_TREE },
 314                 { "commit", cmd_commit, RUN_SETUP | NEED_WORK_TREE },
 315                 { "commit-tree", cmd_commit_tree, RUN_SETUP },
 316                 { "config", cmd_config },
 317                 { "count-objects", cmd_count_objects, RUN_SETUP },
 318                 { "describe", cmd_describe, RUN_SETUP },
 319                 { "diff", cmd_diff },
 320                 { "diff-files", cmd_diff_files, RUN_SETUP | NEED_WORK_TREE },
 321                 { "diff-index", cmd_diff_index, RUN_SETUP },
 322                 { "diff-tree", cmd_diff_tree, RUN_SETUP },
 323                 { "fast-export", cmd_fast_export, RUN_SETUP },
 324                 { "fetch", cmd_fetch, RUN_SETUP },
 325                 { "fetch-pack", cmd_fetch_pack, RUN_SETUP },
 326                 { "fmt-merge-msg", cmd_fmt_merge_msg, RUN_SETUP },
 327                 { "for-each-ref", cmd_for_each_ref, RUN_SETUP },
 328                 { "format-patch", cmd_format_patch, RUN_SETUP },
 329                 { "fsck", cmd_fsck, RUN_SETUP },
 330                 { "fsck-objects", cmd_fsck, RUN_SETUP },
 331                 { "gc", cmd_gc, RUN_SETUP },
 332                 { "get-tar-commit-id", cmd_get_tar_commit_id },
 333                 { "grep", cmd_grep },
 334                 { "hash-object", cmd_hash_object },
 335                 { "help", cmd_help },
 336                 { "index-pack", cmd_index_pack },
 337                 { "init", cmd_init_db },
 338                 { "init-db", cmd_init_db },
 339                 { "log", cmd_log, RUN_SETUP },
 340                 { "ls-files", cmd_ls_files, RUN_SETUP },
 341                 { "ls-tree", cmd_ls_tree, RUN_SETUP },
 342                 { "ls-remote", cmd_ls_remote },
 343                 { "mailinfo", cmd_mailinfo },
 344                 { "mailsplit", cmd_mailsplit },
 345                 { "merge", cmd_merge, RUN_SETUP | NEED_WORK_TREE },
 346                 { "merge-base", cmd_merge_base, RUN_SETUP },
 347                 { "merge-file", cmd_merge_file },
 348                 { "merge-index", cmd_merge_index, RUN_SETUP },
 349                 { "merge-ours", cmd_merge_ours, RUN_SETUP },
 350                 { "merge-recursive", cmd_merge_recursive, RUN_SETUP | NEED_WORK_TREE },
 351                 { "merge-recursive-ours", cmd_merge_recursive, RUN_SETUP | NEED_WORK_TREE },
 352                 { "merge-recursive-theirs", cmd_merge_recursive, RUN_SETUP | NEED_WORK_TREE },
 353                 { "merge-subtree", cmd_merge_recursive, RUN_SETUP | NEED_WORK_TREE },
 354                 { "merge-tree", cmd_merge_tree, RUN_SETUP },
 355                 { "mktag", cmd_mktag, RUN_SETUP },
 356                 { "mktree", cmd_mktree, RUN_SETUP },
 357                 { "mv", cmd_mv, RUN_SETUP | NEED_WORK_TREE },
 358                 { "name-rev", cmd_name_rev, RUN_SETUP },
 359                 { "notes", cmd_notes, RUN_SETUP },
 360                 { "pack-objects", cmd_pack_objects, RUN_SETUP },
 361                 { "pack-redundant", cmd_pack_redundant, RUN_SETUP },
 362                 { "patch-id", cmd_patch_id },
 363                 { "peek-remote", cmd_ls_remote },
 364                 { "pickaxe", cmd_blame, RUN_SETUP },
 365                 { "prune", cmd_prune, RUN_SETUP },
 366                 { "prune-packed", cmd_prune_packed, RUN_SETUP },
 367                 { "push", cmd_push, RUN_SETUP },
 368                 { "read-tree", cmd_read_tree, RUN_SETUP },
 369                 { "receive-pack", cmd_receive_pack },
 370                 { "reflog", cmd_reflog, RUN_SETUP },
 371                 { "remote", cmd_remote, RUN_SETUP },
 372                 { "replace", cmd_replace, RUN_SETUP },
 373                 { "repo-config", cmd_config },
 374                 { "rerere", cmd_rerere, RUN_SETUP },
 375                 { "reset", cmd_reset, RUN_SETUP },
 376                 { "rev-list", cmd_rev_list, RUN_SETUP },
 377                 { "rev-parse", cmd_rev_parse },
 378                 { "revert", cmd_revert, RUN_SETUP | NEED_WORK_TREE },
 379                 { "rm", cmd_rm, RUN_SETUP },
 380                 { "send-pack", cmd_send_pack, RUN_SETUP },
 381                 { "shortlog", cmd_shortlog, USE_PAGER },
 382                 { "show-branch", cmd_show_branch, RUN_SETUP },
 383                 { "show", cmd_show, RUN_SETUP },
 384                 { "status", cmd_status, RUN_SETUP | NEED_WORK_TREE },
 385                 { "stripspace", cmd_stripspace },
 386                 { "symbolic-ref", cmd_symbolic_ref, RUN_SETUP },
 387                 { "tag", cmd_tag, RUN_SETUP },
 388                 { "tar-tree", cmd_tar_tree },
 389                 { "unpack-file", cmd_unpack_file, RUN_SETUP },
 390                 { "unpack-objects", cmd_unpack_objects, RUN_SETUP },
 391                 { "update-index", cmd_update_index, RUN_SETUP },
 392                 { "update-ref", cmd_update_ref, RUN_SETUP },
 393                 { "update-server-info", cmd_update_server_info, RUN_SETUP },
 394                 { "upload-archive", cmd_upload_archive },
 395                 { "var", cmd_var },
 396                 { "verify-tag", cmd_verify_tag, RUN_SETUP },
 397                 { "version", cmd_version },
 398                 { "whatchanged", cmd_whatchanged, RUN_SETUP },
 399                 { "write-tree", cmd_write_tree, RUN_SETUP },
 400                 { "verify-pack", cmd_verify_pack },
 401                 { "show-ref", cmd_show_ref, RUN_SETUP },
 402                 { "pack-refs", cmd_pack_refs, RUN_SETUP },
 403         };
 404         int i;
 405         static const char ext[] = STRIP_EXTENSION;
 406
 407         if (sizeof(ext) > 1) {
 408                 i = strlen(argv[0]) - strlen(ext);
 409                 if (i > 0 && !strcmp(argv[0] + i, ext)) {
 410                         char *argv0 = xstrdup(argv[0]);
 411                         argv[0] = cmd = argv0;
 412                         argv0[i] = '\0';
 413                 }
 414         }
 415
 416         /* Turn "git cmd --help" into "git help cmd" */
 417         if (argc > 1 && !strcmp(argv[1], "--help")) {
 418                 argv[1] = argv[0];
 419                 argv[0] = cmd = "help";
 420         }
 421
 422         for (i = 0; i < ARRAY_SIZE(commands); i++) {
 423                 struct cmd_struct *p = commands+i;
 424                 if (strcmp(p->cmd, cmd))
 425                         continue;
 426                 exit(run_builtin(p, argc, argv));
 427         }
 428 }
 429
 430 static void execv_dashed_external(const char **argv)
 431 {
 432         struct strbuf cmd = STRBUF_INIT;
 433         const char *tmp;
 434         int status;
 435
 436         commit_pager_choice();
 437
 438         strbuf_addf(&cmd, "git-%s", argv[0]);
 439
 440         /*
 441          * argv[0] must be the git command, but the argv array
 442          * belongs to the caller, and may be reused in
 443          * subsequent loop iterations. Save argv[0] and
 444          * restore it on error.
 445          */
 446         tmp = argv[0];
 447         argv[0] = cmd.buf;
 448
 449         trace_argv_printf(argv, "trace: exec:");
 450
 451         /*
 452          * if we fail because the command is not found, it is
 453          * OK to return. Otherwise, we just pass along the status code.
 454          */
 455         status = run_command_v_opt(argv, RUN_SILENT_EXEC_FAILURE);
 456         if (status >= 0 || errno != ENOENT)
 457                 exit(status);
 458
 459         argv[0] = tmp;
 460
 461         strbuf_release(&cmd);
 462 }
 463
 464 static int run_argv(int *argcp, const char ***argv)
 465 {
 466         int done_alias = 0;
 467
 468         while (1) {
 469                 /* See if it's an internal command */
 470                 handle_internal_command(*argcp, *argv);
 471
 472                 /* .. then try the external ones */
 473                 execv_dashed_external(*argv);
 474
 475                 /* It could be an alias -- this works around the insanity
 476                  * of overriding "git log" with "git show" by having
 477                  * alias.log = show
 478                  */
 479                 if (done_alias || !handle_alias(argcp, argv))
 480                         break;
 481                 done_alias = 1;
 482         }
 483
 484         return done_alias;
 485 }
 486
 487
 488 int main(int argc, const char **argv)
 489 {
 490         const char *cmd;
 491
 492         cmd = git_extract_argv0_path(argv[0]);
 493         if (!cmd)
 494                 cmd = "git-help";
 495
 496         /*
 497          * "git-xxxx" is the same as "git xxxx", but we obviously:
 498          *
 499          *  - cannot take flags in between the "git" and the "xxxx".
 500          *  - cannot execute it externally (since it would just do
 501          *    the same thing over again)
 502          *
 503          * So we just directly call the internal command handler, and
 504          * die if that one cannot handle it.
 505          */
 506         if (!prefixcmp(cmd, "git-")) {
 507                 cmd += 4;
 508                 argv[0] = cmd;
 509                 handle_internal_command(argc, argv);
 510                 die("cannot handle %s internally", cmd);
 511         }
 512
 513         /* Look for flags.. */
 514         argv++;
 515         argc--;
 516         handle_options(&argv, &argc, NULL);
 517         if (argc > 0) {
 518                 if (!prefixcmp(argv[0], "--"))
 519                         argv[0] += 2;
 520         } else {
 521                 /* The user didn't specify a command; give them help */
 522                 commit_pager_choice();
 523                 printf("usage: %s\n\n", git_usage_string);
 524                 list_common_cmds_help();
 525                 printf("\n%s\n", git_more_info_string);
 526                 exit(1);
 527         }
 528         cmd = argv[0];
 529
 530         /*
 531          * We use PATH to find git commands, but we prepend some higher
 532          * precedence paths: the "--exec-path" option, the GIT_EXEC_PATH
 533          * environment, and the $(gitexecdir) from the Makefile at build
 534          * time.
 535          */
 536         setup_path();
 537
 538         while (1) {
 539                 static int done_help = 0;
 540                 static int was_alias = 0;
 541                 was_alias = run_argv(&argc, &argv);
 542                 if (errno != ENOENT)
 543                         break;
 544                 if (was_alias) {
 545                         fprintf(stderr, "Expansion of alias '%s' failed; "
 546                                 "'%s' is not a git command\n",
 547                                 cmd, argv[0]);
 548                         exit(1);
 549                 }
 550                 if (!done_help) {
 551                         cmd = argv[0] = help_unknown_cmd(cmd);
 552                         done_help = 1;
 553                 } else
 554                         break;
 555         }
 556
 557         fprintf(stderr, "Failed to run command '%s': %s\n",
 558                 cmd, strerror(errno));
 559
 560         return 1;
 561 }