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", alias_command);
 193                 option_count = handle_options(&new_argv, &count, &envchanged);
 194                 if (envchanged)
 195                         die("alias '%s' changes environment variables\n"
 196                                  "You can use '!git' in the alias to do this.",
 197                                  alias_command);
 198                 memmove(new_argv - option_count, new_argv,
 199                                 count * sizeof(char *));
 200                 new_argv -= option_count;
 201
 202                 if (count < 1)
 203                         die("empty alias for %s", alias_command);
 204
 205                 if (!strcmp(alias_command, new_argv[0]))
 206                         die("recursive alias: %s", alias_command);
 207
 208                 trace_argv_printf(new_argv,
 209                                   "trace: alias expansion: %s =>",
 210                                   alias_command);
 211
 212                 new_argv = xrealloc(new_argv, sizeof(char *) *
 213                                     (count + *argcp));
 214                 /* insert after command name */
 215                 memcpy(new_argv + count, *argv + 1, sizeof(char *) * *argcp);
 216
 217                 *argv = new_argv;
 218                 *argcp += count - 1;
 219
 220                 ret = 1;
 221         }
 222
 223         if (subdir && chdir(subdir))
 224                 die_errno("Cannot change to '%s'", subdir);
 225
 226         errno = saved_errno;
 227
 228         return ret;
 229 }
 230
 231 const char git_version_string[] = GIT_VERSION;
 232
 233 #define RUN_SETUP               (1<<0)
 234 #define RUN_SETUP_GENTLY        (1<<1)
 235 #define USE_PAGER               (1<<2)
 236 /*
 237  * require working tree to be present -- anything uses this needs
 238  * RUN_SETUP for reading from the configuration file.
 239  */
 240 #define NEED_WORK_TREE          (1<<3)
 241
 242 struct cmd_struct {
 243         const char *cmd;
 244         int (*fn)(int, const char **, const char *);
 245         int option;
 246 };
 247
 248 static int run_builtin(struct cmd_struct *p, int argc, const char **argv)
 249 {
 250         int status, help;
 251         struct stat st;
 252         const char *prefix;
 253
 254         prefix = NULL;
 255         help = argc == 2 && !strcmp(argv[1], "-h");
 256         if (!help) {
 257                 if (p->option & RUN_SETUP)
 258                         prefix = setup_git_directory();
 259                 if (p->option & RUN_SETUP_GENTLY) {
 260                         int nongit_ok;
 261                         prefix = setup_git_directory_gently(&nongit_ok);
 262                 }
 263
 264                 if (use_pager == -1 && p->option & (RUN_SETUP | RUN_SETUP_GENTLY))
 265                         use_pager = check_pager_config(p->cmd);
 266                 if (use_pager == -1 && p->option & USE_PAGER)
 267                         use_pager = 1;
 268         }
 269         commit_pager_choice();
 270
 271         if (!help && p->option & NEED_WORK_TREE)
 272                 setup_work_tree();
 273
 274         trace_argv_printf(argv, "trace: built-in: git");
 275
 276         status = p->fn(argc, argv, prefix);
 277         if (status)
 278                 return status;
 279
 280         /* Somebody closed stdout? */
 281         if (fstat(fileno(stdout), &st))
 282                 return 0;
 283         /* Ignore write errors for pipes and sockets.. */
 284         if (S_ISFIFO(st.st_mode) || S_ISSOCK(st.st_mode))
 285                 return 0;
 286
 287         /* Check for ENOSPC and EIO errors.. */
 288         if (fflush(stdout))
 289                 die_errno("write failure on standard output");
 290         if (ferror(stdout))
 291                 die("unknown write failure on standard output");
 292         if (fclose(stdout))
 293                 die_errno("close failed on standard output");
 294         return 0;
 295 }
 296
 297 static void handle_internal_command(int argc, const char **argv)
 298 {
 299         const char *cmd = argv[0];
 300         static struct cmd_struct commands[] = {
 301                 { "add", cmd_add, RUN_SETUP | NEED_WORK_TREE },
 302                 { "stage", cmd_add, RUN_SETUP | NEED_WORK_TREE },
 303                 { "annotate", cmd_annotate, RUN_SETUP },
 304                 { "apply", cmd_apply },
 305                 { "archive", cmd_archive },
 306                 { "bisect--helper", cmd_bisect__helper, RUN_SETUP | NEED_WORK_TREE },
 307                 { "blame", cmd_blame, RUN_SETUP },
 308                 { "branch", cmd_branch, RUN_SETUP },
 309                 { "bundle", cmd_bundle },
 310                 { "cat-file", cmd_cat_file, RUN_SETUP },
 311                 { "checkout", cmd_checkout, RUN_SETUP | NEED_WORK_TREE },
 312                 { "checkout-index", cmd_checkout_index,
 313                         RUN_SETUP | NEED_WORK_TREE},
 314                 { "check-ref-format", cmd_check_ref_format },
 315                 { "check-attr", cmd_check_attr, RUN_SETUP },
 316                 { "cherry", cmd_cherry, RUN_SETUP },
 317                 { "cherry-pick", cmd_cherry_pick, RUN_SETUP | NEED_WORK_TREE },
 318                 { "clone", cmd_clone },
 319                 { "clean", cmd_clean, RUN_SETUP | NEED_WORK_TREE },
 320                 { "commit", cmd_commit, RUN_SETUP | NEED_WORK_TREE },
 321                 { "commit-tree", cmd_commit_tree, RUN_SETUP },
 322                 { "config", cmd_config },
 323                 { "count-objects", cmd_count_objects, RUN_SETUP },
 324                 { "describe", cmd_describe, RUN_SETUP },
 325                 { "diff", cmd_diff },
 326                 { "diff-files", cmd_diff_files, RUN_SETUP | NEED_WORK_TREE },
 327                 { "diff-index", cmd_diff_index, RUN_SETUP },
 328                 { "diff-tree", cmd_diff_tree, RUN_SETUP },
 329                 { "fast-export", cmd_fast_export, RUN_SETUP },
 330                 { "fetch", cmd_fetch, RUN_SETUP },
 331                 { "fetch-pack", cmd_fetch_pack, RUN_SETUP },
 332                 { "fmt-merge-msg", cmd_fmt_merge_msg, RUN_SETUP },
 333                 { "for-each-ref", cmd_for_each_ref, RUN_SETUP },
 334                 { "format-patch", cmd_format_patch, RUN_SETUP },
 335                 { "fsck", cmd_fsck, RUN_SETUP },
 336                 { "fsck-objects", cmd_fsck, RUN_SETUP },
 337                 { "gc", cmd_gc, RUN_SETUP },
 338                 { "get-tar-commit-id", cmd_get_tar_commit_id },
 339                 { "grep", cmd_grep, RUN_SETUP_GENTLY },
 340                 { "hash-object", cmd_hash_object },
 341                 { "help", cmd_help },
 342                 { "index-pack", cmd_index_pack },
 343                 { "init", cmd_init_db },
 344                 { "init-db", cmd_init_db },
 345                 { "log", cmd_log, RUN_SETUP | USE_PAGER },
 346                 { "ls-files", cmd_ls_files, RUN_SETUP },
 347                 { "ls-tree", cmd_ls_tree, RUN_SETUP },
 348                 { "ls-remote", cmd_ls_remote },
 349                 { "mailinfo", cmd_mailinfo },
 350                 { "mailsplit", cmd_mailsplit },
 351                 { "merge", cmd_merge, RUN_SETUP | NEED_WORK_TREE },
 352                 { "merge-base", cmd_merge_base, RUN_SETUP },
 353                 { "merge-file", cmd_merge_file },
 354                 { "merge-index", cmd_merge_index, RUN_SETUP },
 355                 { "merge-ours", cmd_merge_ours, RUN_SETUP },
 356                 { "merge-recursive", cmd_merge_recursive, RUN_SETUP | NEED_WORK_TREE },
 357                 { "merge-recursive-ours", cmd_merge_recursive, RUN_SETUP | NEED_WORK_TREE },
 358                 { "merge-recursive-theirs", cmd_merge_recursive, RUN_SETUP | NEED_WORK_TREE },
 359                 { "merge-subtree", cmd_merge_recursive, RUN_SETUP | NEED_WORK_TREE },
 360                 { "merge-tree", cmd_merge_tree, RUN_SETUP },
 361                 { "mktag", cmd_mktag, RUN_SETUP },
 362                 { "mktree", cmd_mktree, RUN_SETUP },
 363                 { "mv", cmd_mv, RUN_SETUP | NEED_WORK_TREE },
 364                 { "name-rev", cmd_name_rev, RUN_SETUP },
 365                 { "notes", cmd_notes, RUN_SETUP },
 366                 { "pack-objects", cmd_pack_objects, RUN_SETUP },
 367                 { "pack-redundant", cmd_pack_redundant, RUN_SETUP },
 368                 { "patch-id", cmd_patch_id },
 369                 { "peek-remote", cmd_ls_remote },
 370                 { "pickaxe", cmd_blame, RUN_SETUP },
 371                 { "prune", cmd_prune, RUN_SETUP },
 372                 { "prune-packed", cmd_prune_packed, RUN_SETUP },
 373                 { "push", cmd_push, RUN_SETUP },
 374                 { "read-tree", cmd_read_tree, RUN_SETUP },
 375                 { "receive-pack", cmd_receive_pack },
 376                 { "reflog", cmd_reflog, RUN_SETUP },
 377                 { "remote", cmd_remote, RUN_SETUP },
 378                 { "replace", cmd_replace, RUN_SETUP },
 379                 { "repo-config", cmd_config },
 380                 { "rerere", cmd_rerere, RUN_SETUP },
 381                 { "reset", cmd_reset, RUN_SETUP },
 382                 { "rev-list", cmd_rev_list, RUN_SETUP },
 383                 { "rev-parse", cmd_rev_parse },
 384                 { "revert", cmd_revert, RUN_SETUP | NEED_WORK_TREE },
 385                 { "rm", cmd_rm, RUN_SETUP },
 386                 { "send-pack", cmd_send_pack, RUN_SETUP },
 387                 { "shortlog", cmd_shortlog, RUN_SETUP_GENTLY | USE_PAGER },
 388                 { "show-branch", cmd_show_branch, RUN_SETUP },
 389                 { "show", cmd_show, RUN_SETUP | USE_PAGER },
 390                 { "status", cmd_status, RUN_SETUP | NEED_WORK_TREE },
 391                 { "stripspace", cmd_stripspace },
 392                 { "symbolic-ref", cmd_symbolic_ref, RUN_SETUP },
 393                 { "tag", cmd_tag, RUN_SETUP },
 394                 { "tar-tree", cmd_tar_tree },
 395                 { "unpack-file", cmd_unpack_file, RUN_SETUP },
 396                 { "unpack-objects", cmd_unpack_objects, RUN_SETUP },
 397                 { "update-index", cmd_update_index, RUN_SETUP },
 398                 { "update-ref", cmd_update_ref, RUN_SETUP },
 399                 { "update-server-info", cmd_update_server_info, RUN_SETUP },
 400                 { "upload-archive", cmd_upload_archive },
 401                 { "var", cmd_var },
 402                 { "verify-tag", cmd_verify_tag, RUN_SETUP },
 403                 { "version", cmd_version },
 404                 { "whatchanged", cmd_whatchanged, RUN_SETUP | USE_PAGER },
 405                 { "write-tree", cmd_write_tree, RUN_SETUP },
 406                 { "verify-pack", cmd_verify_pack },
 407                 { "show-ref", cmd_show_ref, RUN_SETUP },
 408                 { "pack-refs", cmd_pack_refs, RUN_SETUP },
 409         };
 410         int i;
 411         static const char ext[] = STRIP_EXTENSION;
 412
 413         if (sizeof(ext) > 1) {
 414                 i = strlen(argv[0]) - strlen(ext);
 415                 if (i > 0 && !strcmp(argv[0] + i, ext)) {
 416                         char *argv0 = xstrdup(argv[0]);
 417                         argv[0] = cmd = argv0;
 418                         argv0[i] = '\0';
 419                 }
 420         }
 421
 422         /* Turn "git cmd --help" into "git help cmd" */
 423         if (argc > 1 && !strcmp(argv[1], "--help")) {
 424                 argv[1] = argv[0];
 425                 argv[0] = cmd = "help";
 426         }
 427
 428         for (i = 0; i < ARRAY_SIZE(commands); i++) {
 429                 struct cmd_struct *p = commands+i;
 430                 if (strcmp(p->cmd, cmd))
 431                         continue;
 432                 exit(run_builtin(p, argc, argv));
 433         }
 434 }
 435
 436 static void execv_dashed_external(const char **argv)
 437 {
 438         struct strbuf cmd = STRBUF_INIT;
 439         const char *tmp;
 440         int status;
 441
 442         commit_pager_choice();
 443
 444         strbuf_addf(&cmd, "git-%s", argv[0]);
 445
 446         /*
 447          * argv[0] must be the git command, but the argv array
 448          * belongs to the caller, and may be reused in
 449          * subsequent loop iterations. Save argv[0] and
 450          * restore it on error.
 451          */
 452         tmp = argv[0];
 453         argv[0] = cmd.buf;
 454
 455         trace_argv_printf(argv, "trace: exec:");
 456
 457         /*
 458          * if we fail because the command is not found, it is
 459          * OK to return. Otherwise, we just pass along the status code.
 460          */
 461         status = run_command_v_opt(argv, RUN_SILENT_EXEC_FAILURE);
 462         if (status >= 0 || errno != ENOENT)
 463                 exit(status);
 464
 465         argv[0] = tmp;
 466
 467         strbuf_release(&cmd);
 468 }
 469
 470 static int run_argv(int *argcp, const char ***argv)
 471 {
 472         int done_alias = 0;
 473
 474         while (1) {
 475                 /* See if it's an internal command */
 476                 handle_internal_command(*argcp, *argv);
 477
 478                 /* .. then try the external ones */
 479                 execv_dashed_external(*argv);
 480
 481                 /* It could be an alias -- this works around the insanity
 482                  * of overriding "git log" with "git show" by having
 483                  * alias.log = show
 484                  */
 485                 if (done_alias || !handle_alias(argcp, argv))
 486                         break;
 487                 done_alias = 1;
 488         }
 489
 490         return done_alias;
 491 }
 492
 493
 494 int main(int argc, const char **argv)
 495 {
 496         const char *cmd;
 497
 498         startup_info = &git_startup_info;
 499
 500         cmd = git_extract_argv0_path(argv[0]);
 501         if (!cmd)
 502                 cmd = "git-help";
 503
 504         /*
 505          * "git-xxxx" is the same as "git xxxx", but we obviously:
 506          *
 507          *  - cannot take flags in between the "git" and the "xxxx".
 508          *  - cannot execute it externally (since it would just do
 509          *    the same thing over again)
 510          *
 511          * So we just directly call the internal command handler, and
 512          * die if that one cannot handle it.
 513          */
 514         if (!prefixcmp(cmd, "git-")) {
 515                 cmd += 4;
 516                 argv[0] = cmd;
 517                 handle_internal_command(argc, argv);
 518                 die("cannot handle %s internally", cmd);
 519         }
 520
 521         /* Look for flags.. */
 522         argv++;
 523         argc--;
 524         handle_options(&argv, &argc, NULL);
 525         if (argc > 0) {
 526                 if (!prefixcmp(argv[0], "--"))
 527                         argv[0] += 2;
 528         } else {
 529                 /* The user didn't specify a command; give them help */
 530                 commit_pager_choice();
 531                 printf("usage: %s\n\n", git_usage_string);
 532                 list_common_cmds_help();
 533                 printf("\n%s\n", git_more_info_string);
 534                 exit(1);
 535         }
 536         cmd = argv[0];
 537
 538         /*
 539          * We use PATH to find git commands, but we prepend some higher
 540          * precedence paths: the "--exec-path" option, the GIT_EXEC_PATH
 541          * environment, and the $(gitexecdir) from the Makefile at build
 542          * time.
 543          */
 544         setup_path();
 545
 546         while (1) {
 547                 static int done_help = 0;
 548                 static int was_alias = 0;
 549                 was_alias = run_argv(&argc, &argv);
 550                 if (errno != ENOENT)
 551                         break;
 552                 if (was_alias) {
 553                         fprintf(stderr, "Expansion of alias '%s' failed; "
 554                                 "'%s' is not a git command\n",
 555                                 cmd, argv[0]);
 556                         exit(1);
 557                 }
 558                 if (!done_help) {
 559                         cmd = argv[0] = help_unknown_cmd(cmd);
 560                         done_help = 1;
 561                 } else
 562                         break;
 563         }
 564
 565         fprintf(stderr, "Failed to run command '%s': %s\n",
 566                 cmd, strerror(errno));
 567
 568         return 1;
 569 }