git.c

   1 #include "builtin.h"
   2 #include "exec_cmd.h"
   3 #include "cache.h"
   4 #include "quote.h"
   5
   6 const char git_usage_string[] =
   7         "git [--version] [--exec-path[=GIT_EXEC_PATH]] [-p|--paginate|--no-pager] [--bare] [--git-dir=GIT_DIR] [--work-tree=GIT_WORK_TREE] [--help] COMMAND [ARGS]";
   8
   9 static int handle_options(const char*** argv, int* argc, int* envchanged)
  10 {
  11         int handled = 0;
  12
  13         while (*argc > 0) {
  14                 const char *cmd = (*argv)[0];
  15                 if (cmd[0] != '-')
  16                         break;
  17
  18                 /*
  19                  * For legacy reasons, the "version" and "help"
  20                  * commands can be written with "--" prepended
  21                  * to make them look like flags.
  22                  */
  23                 if (!strcmp(cmd, "--help") || !strcmp(cmd, "--version"))
  24                         break;
  25
  26                 /*
  27                  * Check remaining flags.
  28                  */
  29                 if (!prefixcmp(cmd, "--exec-path")) {
  30                         cmd += 11;
  31                         if (*cmd == '=')
  32                                 git_set_argv_exec_path(cmd + 1);
  33                         else {
  34                                 puts(git_exec_path());
  35                                 exit(0);
  36                         }
  37                 } else if (!strcmp(cmd, "-p") || !strcmp(cmd, "--paginate")) {
  38                         setup_pager();
  39                 } else if (!strcmp(cmd, "--no-pager")) {
  40                         setenv("GIT_PAGER", "cat", 1);
  41                         if (envchanged)
  42                                 *envchanged = 1;
  43                 } else if (!strcmp(cmd, "--git-dir")) {
  44                         if (*argc < 2) {
  45                                 fprintf(stderr, "No directory given for --git-dir.\n" );
  46                                 usage(git_usage_string);
  47                         }
  48                         setenv(GIT_DIR_ENVIRONMENT, (*argv)[1], 1);
  49                         if (envchanged)
  50                                 *envchanged = 1;
  51                         (*argv)++;
  52                         (*argc)--;
  53                         handled++;
  54                 } else if (!prefixcmp(cmd, "--git-dir=")) {
  55                         setenv(GIT_DIR_ENVIRONMENT, cmd + 10, 1);
  56                         if (envchanged)
  57                                 *envchanged = 1;
  58                 } else if (!strcmp(cmd, "--work-tree")) {
  59                         if (*argc < 2) {
  60                                 fprintf(stderr, "No directory given for --work-tree.\n" );
  61                                 usage(git_usage_string);
  62                         }
  63                         setenv(GIT_WORK_TREE_ENVIRONMENT, (*argv)[1], 1);
  64                         if (envchanged)
  65                                 *envchanged = 1;
  66                         (*argv)++;
  67                         (*argc)--;
  68                 } else if (!prefixcmp(cmd, "--work-tree=")) {
  69                         setenv(GIT_WORK_TREE_ENVIRONMENT, cmd + 12, 1);
  70                         if (envchanged)
  71                                 *envchanged = 1;
  72                 } else if (!strcmp(cmd, "--bare")) {
  73                         static char git_dir[PATH_MAX+1];
  74                         is_bare_repository_cfg = 1;
  75                         setenv(GIT_DIR_ENVIRONMENT, getcwd(git_dir, sizeof(git_dir)), 0);
  76                         if (envchanged)
  77                                 *envchanged = 1;
  78                 } else {
  79                         fprintf(stderr, "Unknown option: %s\n", cmd);
  80                         usage(git_usage_string);
  81                 }
  82
  83                 (*argv)++;
  84                 (*argc)--;
  85                 handled++;
  86         }
  87         return handled;
  88 }
  89
  90 static const char *alias_command;
  91 static char *alias_string;
  92
  93 static int git_alias_config(const char *var, const char *value)
  94 {
  95         if (!prefixcmp(var, "alias.") && !strcmp(var + 6, alias_command)) {
  96                 alias_string = xstrdup(value);
  97         }
  98         return 0;
  99 }
 100
 101 static int split_cmdline(char *cmdline, const char ***argv)
 102 {
 103         int src, dst, count = 0, size = 16;
 104         char quoted = 0;
 105
 106         *argv = xmalloc(sizeof(char*) * size);
 107
 108         /* split alias_string */
 109         (*argv)[count++] = cmdline;
 110         for (src = dst = 0; cmdline[src];) {
 111                 char c = cmdline[src];
 112                 if (!quoted && isspace(c)) {
 113                         cmdline[dst++] = 0;
 114                         while (cmdline[++src]
 115                                         && isspace(cmdline[src]))
 116                                 ; /* skip */
 117                         if (count >= size) {
 118                                 size += 16;
 119                                 *argv = xrealloc(*argv, sizeof(char*) * size);
 120                         }
 121                         (*argv)[count++] = cmdline + dst;
 122                 } else if(!quoted && (c == '\'' || c == '"')) {
 123                         quoted = c;
 124                         src++;
 125                 } else if (c == quoted) {
 126                         quoted = 0;
 127                         src++;
 128                 } else {
 129                         if (c == '\\' && quoted != '\'') {
 130                                 src++;
 131                                 c = cmdline[src];
 132                                 if (!c) {
 133                                         free(*argv);
 134                                         *argv = NULL;
 135                                         return error("cmdline ends with \\");
 136                                 }
 137                         }
 138                         cmdline[dst++] = c;
 139                         src++;
 140                 }
 141         }
 142
 143         cmdline[dst] = 0;
 144
 145         if (quoted) {
 146                 free(*argv);
 147                 *argv = NULL;
 148                 return error("unclosed quote");
 149         }
 150
 151         return count;
 152 }
 153
 154 static int handle_alias(int *argcp, const char ***argv)
 155 {
 156         int nongit = 0, envchanged = 0, ret = 0, saved_errno = errno;
 157         const char *subdir;
 158         int count, option_count;
 159         const char** new_argv;
 160
 161         subdir = setup_git_directory_gently(&nongit);
 162
 163         alias_command = (*argv)[0];
 164         git_config(git_alias_config);
 165         if (alias_string) {
 166                 if (alias_string[0] == '!') {
 167                         if (*argcp > 1) {
 168                                 struct strbuf buf;
 169
 170                                 strbuf_init(&buf, PATH_MAX);
 171                                 strbuf_addstr(&buf, alias_string);
 172                                 sq_quote_argv(&buf, (*argv) + 1, *argcp - 1, PATH_MAX);
 173                                 free(alias_string);
 174                                 alias_string = buf.buf;
 175                         }
 176                         trace_printf("trace: alias to shell cmd: %s => %s\n",
 177                                      alias_command, alias_string + 1);
 178                         ret = system(alias_string + 1);
 179                         if (ret >= 0 && WIFEXITED(ret) &&
 180                             WEXITSTATUS(ret) != 127)
 181                                 exit(WEXITSTATUS(ret));
 182                         die("Failed to run '%s' when expanding alias '%s'\n",
 183                             alias_string + 1, alias_command);
 184                 }
 185                 count = split_cmdline(alias_string, &new_argv);
 186                 option_count = handle_options(&new_argv, &count, &envchanged);
 187                 if (envchanged)
 188                         die("alias '%s' changes environment variables\n"
 189                                  "You can use '!git' in the alias to do this.",
 190                                  alias_command);
 191                 memmove(new_argv - option_count, new_argv,
 192                                 count * sizeof(char *));
 193                 new_argv -= option_count;
 194
 195                 if (count < 1)
 196                         die("empty alias for %s", alias_command);
 197
 198                 if (!strcmp(alias_command, new_argv[0]))
 199                         die("recursive alias: %s", alias_command);
 200
 201                 trace_argv_printf(new_argv, count,
 202                                   "trace: alias expansion: %s =>",
 203                                   alias_command);
 204
 205                 new_argv = xrealloc(new_argv, sizeof(char*) *
 206                                     (count + *argcp + 1));
 207                 /* insert after command name */
 208                 memcpy(new_argv + count, *argv + 1, sizeof(char*) * *argcp);
 209                 new_argv[count+*argcp] = NULL;
 210
 211                 *argv = new_argv;
 212                 *argcp += count - 1;
 213
 214                 ret = 1;
 215         }
 216
 217         if (subdir)
 218                 chdir(subdir);
 219
 220         errno = saved_errno;
 221
 222         return ret;
 223 }
 224
 225 const char git_version_string[] = GIT_VERSION;
 226
 227 #define RUN_SETUP       (1<<0)
 228 #define USE_PAGER       (1<<1)
 229 /*
 230  * require working tree to be present -- anything uses this needs
 231  * RUN_SETUP for reading from the configuration file.
 232  */
 233 #define NEED_WORK_TREE  (1<<2)
 234
 235 struct cmd_struct {
 236         const char *cmd;
 237         int (*fn)(int, const char **, const char *);
 238         int option;
 239 };
 240
 241 static int run_command(struct cmd_struct *p, int argc, const char **argv)
 242 {
 243         int status;
 244         struct stat st;
 245         const char *prefix;
 246
 247         prefix = NULL;
 248         if (p->option & RUN_SETUP)
 249                 prefix = setup_git_directory();
 250         if (p->option & USE_PAGER)
 251                 setup_pager();
 252         if (p->option & NEED_WORK_TREE)
 253                 setup_work_tree();
 254
 255         trace_argv_printf(argv, argc, "trace: built-in: git");
 256
 257         status = p->fn(argc, argv, prefix);
 258         if (status)
 259                 return status;
 260
 261         /* Somebody closed stdout? */
 262         if (fstat(fileno(stdout), &st))
 263                 return 0;
 264         /* Ignore write errors for pipes and sockets.. */
 265         if (S_ISFIFO(st.st_mode) || S_ISSOCK(st.st_mode))
 266                 return 0;
 267
 268         /* Check for ENOSPC and EIO errors.. */
 269         if (fflush(stdout))
 270                 die("write failure on standard output: %s", strerror(errno));
 271         if (ferror(stdout))
 272                 die("unknown write failure on standard output");
 273         if (fclose(stdout))
 274                 die("close failed on standard output: %s", strerror(errno));
 275         return 0;
 276 }
 277
 278 static void handle_internal_command(int argc, const char **argv)
 279 {
 280         const char *cmd = argv[0];
 281         static struct cmd_struct commands[] = {
 282                 { "add", cmd_add, RUN_SETUP | NEED_WORK_TREE },
 283                 { "annotate", cmd_annotate, RUN_SETUP },
 284                 { "apply", cmd_apply },
 285                 { "archive", cmd_archive },
 286                 { "blame", cmd_blame, RUN_SETUP },
 287                 { "branch", cmd_branch, RUN_SETUP },
 288                 { "bundle", cmd_bundle },
 289                 { "cat-file", cmd_cat_file, RUN_SETUP },
 290                 { "checkout-index", cmd_checkout_index,
 291                         RUN_SETUP | NEED_WORK_TREE},
 292                 { "check-ref-format", cmd_check_ref_format },
 293                 { "check-attr", cmd_check_attr, RUN_SETUP | NEED_WORK_TREE },
 294                 { "cherry", cmd_cherry, RUN_SETUP },
 295                 { "cherry-pick", cmd_cherry_pick, RUN_SETUP | NEED_WORK_TREE },
 296                 { "commit-tree", cmd_commit_tree, RUN_SETUP },
 297                 { "config", cmd_config },
 298                 { "count-objects", cmd_count_objects, RUN_SETUP },
 299                 { "describe", cmd_describe, RUN_SETUP },
 300                 { "diff", cmd_diff },
 301                 { "diff-files", cmd_diff_files },
 302                 { "diff-index", cmd_diff_index, RUN_SETUP },
 303                 { "diff-tree", cmd_diff_tree, RUN_SETUP },
 304                 { "fetch", cmd_fetch, RUN_SETUP },
 305                 { "fetch-pack", cmd_fetch_pack, RUN_SETUP },
 306                 { "fetch--tool", cmd_fetch__tool, RUN_SETUP },
 307                 { "fmt-merge-msg", cmd_fmt_merge_msg, RUN_SETUP },
 308                 { "for-each-ref", cmd_for_each_ref, RUN_SETUP },
 309                 { "format-patch", cmd_format_patch, RUN_SETUP },
 310                 { "fsck", cmd_fsck, RUN_SETUP },
 311                 { "fsck-objects", cmd_fsck, RUN_SETUP },
 312                 { "gc", cmd_gc, RUN_SETUP },
 313                 { "get-tar-commit-id", cmd_get_tar_commit_id },
 314                 { "grep", cmd_grep, RUN_SETUP | USE_PAGER },
 315                 { "help", cmd_help },
 316 #ifndef NO_CURL
 317                 { "http-fetch", cmd_http_fetch, RUN_SETUP },
 318 #endif
 319                 { "init", cmd_init_db },
 320                 { "init-db", cmd_init_db },
 321                 { "log", cmd_log, RUN_SETUP | USE_PAGER },
 322                 { "ls-files", cmd_ls_files, RUN_SETUP },
 323                 { "ls-tree", cmd_ls_tree, RUN_SETUP },
 324                 { "mailinfo", cmd_mailinfo },
 325                 { "mailsplit", cmd_mailsplit },
 326                 { "merge-base", cmd_merge_base, RUN_SETUP },
 327                 { "merge-file", cmd_merge_file },
 328                 { "mv", cmd_mv, RUN_SETUP | NEED_WORK_TREE },
 329                 { "name-rev", cmd_name_rev, RUN_SETUP },
 330                 { "pack-objects", cmd_pack_objects, RUN_SETUP },
 331                 { "pickaxe", cmd_blame, RUN_SETUP },
 332                 { "prune", cmd_prune, RUN_SETUP },
 333                 { "prune-packed", cmd_prune_packed, RUN_SETUP },
 334                 { "push", cmd_push, RUN_SETUP },
 335                 { "read-tree", cmd_read_tree, RUN_SETUP },
 336                 { "reflog", cmd_reflog, RUN_SETUP },
 337                 { "repo-config", cmd_config },
 338                 { "rerere", cmd_rerere, RUN_SETUP },
 339                 { "reset", cmd_reset, RUN_SETUP },
 340                 { "rev-list", cmd_rev_list, RUN_SETUP },
 341                 { "rev-parse", cmd_rev_parse, RUN_SETUP },
 342                 { "revert", cmd_revert, RUN_SETUP | NEED_WORK_TREE },
 343                 { "rm", cmd_rm, RUN_SETUP },
 344                 { "runstatus", cmd_runstatus, RUN_SETUP | NEED_WORK_TREE },
 345                 { "shortlog", cmd_shortlog, RUN_SETUP | USE_PAGER },
 346                 { "show-branch", cmd_show_branch, RUN_SETUP },
 347                 { "show", cmd_show, RUN_SETUP | USE_PAGER },
 348                 { "stripspace", cmd_stripspace },
 349                 { "symbolic-ref", cmd_symbolic_ref, RUN_SETUP },
 350                 { "tag", cmd_tag, RUN_SETUP },
 351                 { "tar-tree", cmd_tar_tree },
 352                 { "unpack-objects", cmd_unpack_objects, RUN_SETUP },
 353                 { "update-index", cmd_update_index, RUN_SETUP },
 354                 { "update-ref", cmd_update_ref, RUN_SETUP },
 355                 { "upload-archive", cmd_upload_archive },
 356                 { "verify-tag", cmd_verify_tag, RUN_SETUP },
 357                 { "version", cmd_version },
 358                 { "whatchanged", cmd_whatchanged, RUN_SETUP | USE_PAGER },
 359                 { "write-tree", cmd_write_tree, RUN_SETUP },
 360                 { "verify-pack", cmd_verify_pack },
 361                 { "show-ref", cmd_show_ref, RUN_SETUP },
 362                 { "pack-refs", cmd_pack_refs, RUN_SETUP },
 363         };
 364         int i;
 365
 366         /* Turn "git cmd --help" into "git help cmd" */
 367         if (argc > 1 && !strcmp(argv[1], "--help")) {
 368                 argv[1] = argv[0];
 369                 argv[0] = cmd = "help";
 370         }
 371
 372         for (i = 0; i < ARRAY_SIZE(commands); i++) {
 373                 struct cmd_struct *p = commands+i;
 374                 if (strcmp(p->cmd, cmd))
 375                         continue;
 376                 exit(run_command(p, argc, argv));
 377         }
 378 }
 379
 380 int main(int argc, const char **argv)
 381 {
 382         const char *cmd = argv[0] ? argv[0] : "git-help";
 383         char *slash = strrchr(cmd, '/');
 384         const char *cmd_path = NULL;
 385         int done_alias = 0;
 386
 387         /*
 388          * Take the basename of argv[0] as the command
 389          * name, and the dirname as the default exec_path
 390          * if we don't have anything better.
 391          */
 392         if (slash) {
 393                 *slash++ = 0;
 394                 cmd_path = cmd;
 395                 cmd = slash;
 396         }
 397
 398         /*
 399          * "git-xxxx" is the same as "git xxxx", but we obviously:
 400          *
 401          *  - cannot take flags in between the "git" and the "xxxx".
 402          *  - cannot execute it externally (since it would just do
 403          *    the same thing over again)
 404          *
 405          * So we just directly call the internal command handler, and
 406          * die if that one cannot handle it.
 407          */
 408         if (!prefixcmp(cmd, "git-")) {
 409                 cmd += 4;
 410                 argv[0] = cmd;
 411                 handle_internal_command(argc, argv);
 412                 die("cannot handle %s internally", cmd);
 413         }
 414
 415         /* Look for flags.. */
 416         argv++;
 417         argc--;
 418         handle_options(&argv, &argc, NULL);
 419         if (argc > 0) {
 420                 if (!prefixcmp(argv[0], "--"))
 421                         argv[0] += 2;
 422         } else {
 423                 /* The user didn't specify a command; give them help */
 424                 printf("usage: %s\n\n", git_usage_string);
 425                 list_common_cmds_help();
 426                 exit(1);
 427         }
 428         cmd = argv[0];
 429
 430         /*
 431          * We use PATH to find git commands, but we prepend some higher
 432          * precidence paths: the "--exec-path" option, the GIT_EXEC_PATH
 433          * environment, and the $(gitexecdir) from the Makefile at build
 434          * time.
 435          */
 436         setup_path(cmd_path);
 437
 438         while (1) {
 439                 /* See if it's an internal command */
 440                 handle_internal_command(argc, argv);
 441
 442                 /* .. then try the external ones */
 443                 execv_git_cmd(argv);
 444
 445                 /* It could be an alias -- this works around the insanity
 446                  * of overriding "git log" with "git show" by having
 447                  * alias.log = show
 448                  */
 449                 if (done_alias || !handle_alias(&argc, &argv))
 450                         break;
 451                 done_alias = 1;
 452         }
 453
 454         if (errno == ENOENT) {
 455                 if (done_alias) {
 456                         fprintf(stderr, "Expansion of alias '%s' failed; "
 457                                 "'%s' is not a git-command\n",
 458                                 cmd, argv[0]);
 459                         exit(1);
 460                 }
 461                 help_unknown_cmd(cmd);
 462         }
 463
 464         fprintf(stderr, "Failed to run command '%s': %s\n",
 465                 cmd, strerror(errno));
 466
 467         return 1;
 468 }