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