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 struct startup_info git_startup_info;
  18 static int use_pager = -1;
  19 struct pager_config {
  20         const char *cmd;
  21         int val;
  22 };
  23
  24 static int pager_command_config(const char *var, const char *value, void *data)
  25 {
  26         struct pager_config *c = data;
  27         if (!prefixcmp(var, "pager.") && !strcmp(var + 6, c->cmd))
  28                 c->val = git_config_bool(var, value);
  29         return 0;
  30 }
  31
  32 /* returns 0 for "no pager", 1 for "use pager", and -1 for "not specified" */
  33 int check_pager_config(const char *cmd)
  34 {
  35         struct pager_config c;
  36         c.cmd = cmd;
  37         c.val = -1;
  38         git_config(pager_command_config, &c);
  39         return c.val;
  40 }
  41
  42 static void commit_pager_choice(void) {
  43         switch (use_pager) {
  44         case 0:
  45                 setenv("GIT_PAGER", "cat", 1);
  46                 break;
  47         case 1:
  48                 setup_pager();
  49                 break;
  50         default:
  51                 break;
  52         }
  53 }
  54
  55 static int handle_options(const char ***argv, int *argc, int *envchanged)
  56 {
  57         int handled = 0;
  58
  59         if (!getenv("GIT_ASKPASS") && getenv("SSH_ASKPASS"))
  60                 setenv("GIT_ASKPASS", getenv("SSH_ASKPASS"), 1);
  61
  62         while (*argc > 0) {
  63                 const char *cmd = (*argv)[0];
  64                 if (cmd[0] != '-')
  65                         break;
  66
  67                 /*
  68                  * For legacy reasons, the "version" and "help"
  69                  * commands can be written with "--" prepended
  70                  * to make them look like flags.
  71                  */
  72                 if (!strcmp(cmd, "--help") || !strcmp(cmd, "--version"))
  73                         break;
  74
  75                 /*
  76                  * Check remaining flags.
  77                  */
  78                 if (!prefixcmp(cmd, "--exec-path")) {
  79                         cmd += 11;
  80                         if (*cmd == '=')
  81                                 git_set_argv_exec_path(cmd + 1);
  82                         else {
  83                                 puts(git_exec_path());
  84                                 exit(0);
  85                         }
  86                 } else if (!strcmp(cmd, "--html-path")) {
  87                         puts(system_path(GIT_HTML_PATH));
  88                         exit(0);
  89                 } else if (!strcmp(cmd, "-p") || !strcmp(cmd, "--paginate")) {
  90                         use_pager = 1;
  91                 } else if (!strcmp(cmd, "--no-pager")) {
  92                         use_pager = 0;
  93                         if (envchanged)
  94                                 *envchanged = 1;
  95                 } else if (!strcmp(cmd, "--no-replace-objects")) {
  96                         read_replace_refs = 0;
  97                         setenv(NO_REPLACE_OBJECTS_ENVIRONMENT, "1", 1);
  98                         if (envchanged)
  99                                 *envchanged = 1;
 100                 } else if (!strcmp(cmd, "--git-dir")) {
 101                         if (*argc < 2) {
 102                                 fprintf(stderr, "No directory given for --git-dir.\n" );
 103                                 usage(git_usage_string);
 104                         }
 105                         setenv(GIT_DIR_ENVIRONMENT, (*argv)[1], 1);
 106                         if (envchanged)
 107                                 *envchanged = 1;
 108                         (*argv)++;
 109                         (*argc)--;
 110                         handled++;
 111                 } else if (!prefixcmp(cmd, "--git-dir=")) {
 112                         setenv(GIT_DIR_ENVIRONMENT, cmd + 10, 1);
 113                         if (envchanged)
 114                                 *envchanged = 1;
 115                 } else if (!strcmp(cmd, "--work-tree")) {
 116                         if (*argc < 2) {
 117                                 fprintf(stderr, "No directory given for --work-tree.\n" );
 118                                 usage(git_usage_string);
 119                         }
 120                         setenv(GIT_WORK_TREE_ENVIRONMENT, (*argv)[1], 1);
 121                         if (envchanged)
 122                                 *envchanged = 1;
 123                         (*argv)++;
 124                         (*argc)--;
 125                 } else if (!prefixcmp(cmd, "--work-tree=")) {
 126                         setenv(GIT_WORK_TREE_ENVIRONMENT, cmd + 12, 1);
 127                         if (envchanged)
 128                                 *envchanged = 1;
 129                 } else if (!strcmp(cmd, "--bare")) {
 130                         static char git_dir[PATH_MAX+1];
 131                         is_bare_repository_cfg = 1;
 132                         setenv(GIT_DIR_ENVIRONMENT, getcwd(git_dir, sizeof(git_dir)), 0);
 133                         if (envchanged)
 134                                 *envchanged = 1;
 135                 } else if (!strcmp(cmd, "-c")) {
 136                         if (*argc < 2) {
 137                                 fprintf(stderr, "-c expects a configuration string\n" );
 138                                 usage(git_usage_string);
 139                         }
 140                         git_config_parse_parameter((*argv)[1]);
 141                         (*argv)++;
 142                         (*argc)--;
 143                 } else {
 144                         fprintf(stderr, "Unknown option: %s\n", cmd);
 145                         usage(git_usage_string);
 146                 }
 147
 148                 (*argv)++;
 149                 (*argc)--;
 150                 handled++;
 151         }
 152         return handled;
 153 }
 154
 155 static int handle_alias(int *argcp, const char ***argv)
 156 {
 157         int envchanged = 0, ret = 0, saved_errno = errno;
 158         const char *subdir;
 159         int count, option_count;
 160         const char **new_argv;
 161         const char *alias_command;
 162         char *alias_string;
 163         int unused_nongit;
 164
 165         subdir = setup_git_directory_gently(&unused_nongit);
 166
 167         alias_command = (*argv)[0];
 168         alias_string = alias_lookup(alias_command);
 169         if (alias_string) {
 170                 if (alias_string[0] == '!') {
 171                         commit_pager_choice();
 172                         if (*argcp > 1) {
 173                                 struct strbuf buf;
 174
 175                                 strbuf_init(&buf, PATH_MAX);
 176                                 strbuf_addstr(&buf, alias_string);
 177                                 sq_quote_argv(&buf, (*argv) + 1, PATH_MAX);
 178                                 free(alias_string);
 179                                 alias_string = buf.buf;
 180                         }
 181                         trace_printf("trace: alias to shell cmd: %s => %s\n",
 182                                      alias_command, alias_string + 1);
 183                         ret = system(alias_string + 1);
 184                         if (ret >= 0 && WIFEXITED(ret) &&
 185                             WEXITSTATUS(ret) != 127)
 186                                 exit(WEXITSTATUS(ret));
 187                         die("Failed to run '%s' when expanding alias '%s'",
 188                             alias_string + 1, alias_command);
 189                 }
 190                 count = split_cmdline(alias_string, &new_argv);
 191                 if (count < 0)
 192                         die("Bad alias.%s string: %s", alias_command,
 193                             split_cmdline_strerror(count));
 194                 option_count = handle_options(&new_argv, &count, &envchanged);
 195                 if (envchanged)
 196                         die("alias '%s' changes environment variables\n"
 197                                  "You can use '!git' in the alias to do this.",
 198                                  alias_command);
 199                 memmove(new_argv - option_count, new_argv,
 200                                 count * sizeof(char *));
 201                 new_argv -= option_count;
 202
 203                 if (count < 1)
 204                         die("empty alias for %s", alias_command);
 205
 206                 if (!strcmp(alias_command, new_argv[0]))
 207                         die("recursive alias: %s", alias_command);
 208
 209                 trace_argv_printf(new_argv,
 210                                   "trace: alias expansion: %s =>",
 211                                   alias_command);
 212
 213                 new_argv = xrealloc(new_argv, sizeof(char *) *
 214                                     (count + *argcp));
 215                 /* insert after command name */
 216                 memcpy(new_argv + count, *argv + 1, sizeof(char *) * *argcp);
 217
 218                 *argv = new_argv;
 219                 *argcp += count - 1;
 220
 221                 ret = 1;
 222         }
 223
 224         if (subdir && chdir(subdir))
 225                 die_errno("Cannot change to '%s'", subdir);
 226
 227         errno = saved_errno;
 228
 229         return ret;
 230 }
 231
 232 const char git_version_string[] = GIT_VERSION;
 233
 234 #define RUN_SETUP               (1<<0)
 235 #define RUN_SETUP_GENTLY        (1<<1)
 236 #define USE_PAGER               (1<<2)
 237 /*
 238  * require working tree to be present -- anything uses this needs
 239  * RUN_SETUP for reading from the configuration file.
 240  */
 241 #define NEED_WORK_TREE          (1<<3)
 242
 243 struct cmd_struct {
 244         const char *cmd;
 245         int (*fn)(int, const char **, const char *);
 246         int option;
 247 };
 248
 249 static int run_builtin(struct cmd_struct *p, int argc, const char **argv)
 250 {
 251         int status, help;
 252         struct stat st;
 253         const char *prefix;
 254
 255         prefix = NULL;
 256         help = argc == 2 && !strcmp(argv[1], "-h");
 257         if (!help) {
 258                 if (p->option & RUN_SETUP)
 259                         prefix = setup_git_directory();
 260                 if (p->option & RUN_SETUP_GENTLY) {
 261                         int nongit_ok;
 262                         prefix = setup_git_directory_gently(&nongit_ok);
 263                 }
 264
 265                 if (use_pager == -1 && p->option & (RUN_SETUP | RUN_SETUP_GENTLY))
 266                         use_pager = check_pager_config(p->cmd);
 267                 if (use_pager == -1 && p->option & USE_PAGER)
 268                         use_pager = 1;
 269         }
 270         commit_pager_choice();
 271
 272         if (!help && p->option & NEED_WORK_TREE)
 273                 setup_work_tree();
 274
 275         trace_argv_printf(argv, "trace: built-in: git");
 276
 277         status = p->fn(argc, argv, prefix);
 278         if (status)
 279                 return status;
 280
 281         /* Somebody closed stdout? */
 282         if (fstat(fileno(stdout), &st))
 283                 return 0;
 284         /* Ignore write errors for pipes and sockets.. */
 285         if (S_ISFIFO(st.st_mode) || S_ISSOCK(st.st_mode))
 286                 return 0;
 287
 288         /* Check for ENOSPC and EIO errors.. */
 289         if (fflush(stdout))
 290                 die_errno("write failure on standard output");
 291         if (ferror(stdout))
 292                 die("unknown write failure on standard output");
 293         if (fclose(stdout))
 294                 die_errno("close failed on standard output");
 295         return 0;
 296 }
 297
 298 static void handle_internal_command(int argc, const char **argv)
 299 {
 300         const char *cmd = argv[0];
 301         static struct cmd_struct commands[] = {
 302                 { "add", cmd_add, RUN_SETUP | NEED_WORK_TREE },
 303                 { "stage", cmd_add, RUN_SETUP | NEED_WORK_TREE },
 304                 { "annotate", cmd_annotate, RUN_SETUP },
 305                 { "apply", cmd_apply, RUN_SETUP_GENTLY },
 306                 { "archive", cmd_archive },
 307                 { "bisect--helper", cmd_bisect__helper, RUN_SETUP | NEED_WORK_TREE },
 308                 { "blame", cmd_blame, RUN_SETUP },
 309                 { "branch", cmd_branch, RUN_SETUP },
 310                 { "bundle", cmd_bundle, RUN_SETUP_GENTLY },
 311                 { "cat-file", cmd_cat_file, RUN_SETUP },
 312                 { "checkout", cmd_checkout, RUN_SETUP | NEED_WORK_TREE },
 313                 { "checkout-index", cmd_checkout_index,
 314                         RUN_SETUP | NEED_WORK_TREE},
 315                 { "check-ref-format", cmd_check_ref_format },
 316                 { "check-attr", cmd_check_attr, RUN_SETUP },
 317                 { "cherry", cmd_cherry, RUN_SETUP },
 318                 { "cherry-pick", cmd_cherry_pick, RUN_SETUP | NEED_WORK_TREE },
 319                 { "clone", cmd_clone },
 320                 { "clean", cmd_clean, RUN_SETUP | NEED_WORK_TREE },
 321                 { "commit", cmd_commit, RUN_SETUP | NEED_WORK_TREE },
 322                 { "commit-tree", cmd_commit_tree, RUN_SETUP },
 323                 { "config", cmd_config, RUN_SETUP_GENTLY },
 324                 { "count-objects", cmd_count_objects, RUN_SETUP },
 325                 { "describe", cmd_describe, RUN_SETUP },
 326                 { "diff", cmd_diff },
 327                 { "diff-files", cmd_diff_files, RUN_SETUP | NEED_WORK_TREE },
 328                 { "diff-index", cmd_diff_index, RUN_SETUP },
 329                 { "diff-tree", cmd_diff_tree, RUN_SETUP },
 330                 { "fast-export", cmd_fast_export, RUN_SETUP },
 331                 { "fetch", cmd_fetch, RUN_SETUP },
 332                 { "fetch-pack", cmd_fetch_pack, RUN_SETUP },
 333                 { "fmt-merge-msg", cmd_fmt_merge_msg, RUN_SETUP },
 334                 { "for-each-ref", cmd_for_each_ref, RUN_SETUP },
 335                 { "format-patch", cmd_format_patch, RUN_SETUP },
 336                 { "fsck", cmd_fsck, RUN_SETUP },
 337                 { "fsck-objects", cmd_fsck, RUN_SETUP },
 338                 { "gc", cmd_gc, RUN_SETUP },
 339                 { "get-tar-commit-id", cmd_get_tar_commit_id },
 340                 { "grep", cmd_grep, RUN_SETUP_GENTLY },
 341                 { "hash-object", cmd_hash_object },
 342                 { "help", cmd_help },
 343                 { "index-pack", cmd_index_pack, RUN_SETUP_GENTLY },
 344                 { "init", cmd_init_db },
 345                 { "init-db", cmd_init_db },
 346                 { "log", cmd_log, RUN_SETUP | USE_PAGER },
 347                 { "ls-files", cmd_ls_files, RUN_SETUP },
 348                 { "ls-tree", cmd_ls_tree, RUN_SETUP },
 349                 { "ls-remote", cmd_ls_remote, RUN_SETUP_GENTLY },
 350                 { "mailinfo", cmd_mailinfo },
 351                 { "mailsplit", cmd_mailsplit },
 352                 { "merge", cmd_merge, RUN_SETUP | NEED_WORK_TREE },
 353                 { "merge-base", cmd_merge_base, RUN_SETUP },
 354                 { "merge-file", cmd_merge_file, RUN_SETUP_GENTLY },
 355                 { "merge-index", cmd_merge_index, RUN_SETUP },
 356                 { "merge-ours", cmd_merge_ours, RUN_SETUP },
 357                 { "merge-recursive", cmd_merge_recursive, RUN_SETUP | NEED_WORK_TREE },
 358                 { "merge-recursive-ours", cmd_merge_recursive, RUN_SETUP | NEED_WORK_TREE },
 359                 { "merge-recursive-theirs", cmd_merge_recursive, RUN_SETUP | NEED_WORK_TREE },
 360                 { "merge-subtree", cmd_merge_recursive, RUN_SETUP | NEED_WORK_TREE },
 361                 { "merge-tree", cmd_merge_tree, RUN_SETUP },
 362                 { "mktag", cmd_mktag, RUN_SETUP },
 363                 { "mktree", cmd_mktree, RUN_SETUP },
 364                 { "mv", cmd_mv, RUN_SETUP | NEED_WORK_TREE },
 365                 { "name-rev", cmd_name_rev, RUN_SETUP },
 366                 { "notes", cmd_notes, RUN_SETUP },
 367                 { "pack-objects", cmd_pack_objects, RUN_SETUP },
 368                 { "pack-redundant", cmd_pack_redundant, RUN_SETUP },
 369                 { "patch-id", cmd_patch_id },
 370                 { "peek-remote", cmd_ls_remote, RUN_SETUP_GENTLY },
 371                 { "pickaxe", cmd_blame, RUN_SETUP },
 372                 { "prune", cmd_prune, RUN_SETUP },
 373                 { "prune-packed", cmd_prune_packed, RUN_SETUP },
 374                 { "push", cmd_push, RUN_SETUP },
 375                 { "read-tree", cmd_read_tree, RUN_SETUP },
 376                 { "receive-pack", cmd_receive_pack },
 377                 { "reflog", cmd_reflog, RUN_SETUP },
 378                 { "remote", cmd_remote, RUN_SETUP },
 379                 { "replace", cmd_replace, RUN_SETUP },
 380                 { "repo-config", cmd_config, RUN_SETUP_GENTLY },
 381                 { "rerere", cmd_rerere, RUN_SETUP },
 382                 { "reset", cmd_reset, RUN_SETUP },
 383                 { "rev-list", cmd_rev_list, RUN_SETUP },
 384                 { "rev-parse", cmd_rev_parse },
 385                 { "revert", cmd_revert, RUN_SETUP | NEED_WORK_TREE },
 386                 { "rm", cmd_rm, RUN_SETUP },
 387                 { "send-pack", cmd_send_pack, RUN_SETUP },
 388                 { "shortlog", cmd_shortlog, RUN_SETUP_GENTLY | USE_PAGER },
 389                 { "show-branch", cmd_show_branch, RUN_SETUP },
 390                 { "show", cmd_show, RUN_SETUP | USE_PAGER },
 391                 { "status", cmd_status, RUN_SETUP | NEED_WORK_TREE },
 392                 { "stripspace", cmd_stripspace },
 393                 { "symbolic-ref", cmd_symbolic_ref, RUN_SETUP },
 394                 { "tag", cmd_tag, RUN_SETUP },
 395                 { "tar-tree", cmd_tar_tree },
 396                 { "unpack-file", cmd_unpack_file, RUN_SETUP },
 397                 { "unpack-objects", cmd_unpack_objects, RUN_SETUP },
 398                 { "update-index", cmd_update_index, RUN_SETUP },
 399                 { "update-ref", cmd_update_ref, RUN_SETUP },
 400                 { "update-server-info", cmd_update_server_info, RUN_SETUP },
 401                 { "upload-archive", cmd_upload_archive },
 402                 { "var", cmd_var, RUN_SETUP_GENTLY },
 403                 { "verify-tag", cmd_verify_tag, RUN_SETUP },
 404                 { "version", cmd_version },
 405                 { "whatchanged", cmd_whatchanged, RUN_SETUP | USE_PAGER },
 406                 { "write-tree", cmd_write_tree, RUN_SETUP },
 407                 { "verify-pack", cmd_verify_pack },
 408                 { "show-ref", cmd_show_ref, RUN_SETUP },
 409                 { "pack-refs", cmd_pack_refs, RUN_SETUP },
 410         };
 411         int i;
 412         static const char ext[] = STRIP_EXTENSION;
 413
 414         if (sizeof(ext) > 1) {
 415                 i = strlen(argv[0]) - strlen(ext);
 416                 if (i > 0 && !strcmp(argv[0] + i, ext)) {
 417                         char *argv0 = xstrdup(argv[0]);
 418                         argv[0] = cmd = argv0;
 419                         argv0[i] = '\0';
 420                 }
 421         }
 422
 423         /* Turn "git cmd --help" into "git help cmd" */
 424         if (argc > 1 && !strcmp(argv[1], "--help")) {
 425                 argv[1] = argv[0];
 426                 argv[0] = cmd = "help";
 427         }
 428
 429         for (i = 0; i < ARRAY_SIZE(commands); i++) {
 430                 struct cmd_struct *p = commands+i;
 431                 if (strcmp(p->cmd, cmd))
 432                         continue;
 433                 exit(run_builtin(p, argc, argv));
 434         }
 435 }
 436
 437 static void execv_dashed_external(const char **argv)
 438 {
 439         struct strbuf cmd = STRBUF_INIT;
 440         const char *tmp;
 441         int status;
 442
 443         commit_pager_choice();
 444
 445         strbuf_addf(&cmd, "git-%s", argv[0]);
 446
 447         /*
 448          * argv[0] must be the git command, but the argv array
 449          * belongs to the caller, and may be reused in
 450          * subsequent loop iterations. Save argv[0] and
 451          * restore it on error.
 452          */
 453         tmp = argv[0];
 454         argv[0] = cmd.buf;
 455
 456         trace_argv_printf(argv, "trace: exec:");
 457
 458         /*
 459          * if we fail because the command is not found, it is
 460          * OK to return. Otherwise, we just pass along the status code.
 461          */
 462         status = run_command_v_opt(argv, RUN_SILENT_EXEC_FAILURE);
 463         if (status >= 0 || errno != ENOENT)
 464                 exit(status);
 465
 466         argv[0] = tmp;
 467
 468         strbuf_release(&cmd);
 469 }
 470
 471 static int run_argv(int *argcp, const char ***argv)
 472 {
 473         int done_alias = 0;
 474
 475         while (1) {
 476                 /* See if it's an internal command */
 477                 handle_internal_command(*argcp, *argv);
 478
 479                 /* .. then try the external ones */
 480                 execv_dashed_external(*argv);
 481
 482                 /* It could be an alias -- this works around the insanity
 483                  * of overriding "git log" with "git show" by having
 484                  * alias.log = show
 485                  */
 486                 if (done_alias || !handle_alias(argcp, argv))
 487                         break;
 488                 done_alias = 1;
 489         }
 490
 491         return done_alias;
 492 }
 493
 494
 495 int main(int argc, const char **argv)
 496 {
 497         const char *cmd;
 498
 499         startup_info = &git_startup_info;
 500
 501         cmd = git_extract_argv0_path(argv[0]);
 502         if (!cmd)
 503                 cmd = "git-help";
 504
 505         /*
 506          * "git-xxxx" is the same as "git xxxx", but we obviously:
 507          *
 508          *  - cannot take flags in between the "git" and the "xxxx".
 509          *  - cannot execute it externally (since it would just do
 510          *    the same thing over again)
 511          *
 512          * So we just directly call the internal command handler, and
 513          * die if that one cannot handle it.
 514          */
 515         if (!prefixcmp(cmd, "git-")) {
 516                 cmd += 4;
 517                 argv[0] = cmd;
 518                 handle_internal_command(argc, argv);
 519                 die("cannot handle %s internally", cmd);
 520         }
 521
 522         /* Look for flags.. */
 523         argv++;
 524         argc--;
 525         handle_options(&argv, &argc, NULL);
 526         if (argc > 0) {
 527                 if (!prefixcmp(argv[0], "--"))
 528                         argv[0] += 2;
 529         } else {
 530                 /* The user didn't specify a command; give them help */
 531                 commit_pager_choice();
 532                 printf("usage: %s\n\n", git_usage_string);
 533                 list_common_cmds_help();
 534                 printf("\n%s\n", git_more_info_string);
 535                 exit(1);
 536         }
 537         cmd = argv[0];
 538
 539         /*
 540          * We use PATH to find git commands, but we prepend some higher
 541          * precedence paths: the "--exec-path" option, the GIT_EXEC_PATH
 542          * environment, and the $(gitexecdir) from the Makefile at build
 543          * time.
 544          */
 545         setup_path();
 546
 547         while (1) {
 548                 static int done_help = 0;
 549                 static int was_alias = 0;
 550                 was_alias = run_argv(&argc, &argv);
 551                 if (errno != ENOENT)
 552                         break;
 553                 if (was_alias) {
 554                         fprintf(stderr, "Expansion of alias '%s' failed; "
 555                                 "'%s' is not a git command\n",
 556                                 cmd, argv[0]);
 557                         exit(1);
 558                 }
 559                 if (!done_help) {
 560                         cmd = argv[0] = help_unknown_cmd(cmd);
 561                         done_help = 1;
 562                 } else
 563                         break;
 564         }
 565
 566         fprintf(stderr, "Failed to run command '%s': %s\n",
 567                 cmd, strerror(errno));
 568
 569         return 1;
 570 }