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1 | #include "builtin.h" | |
2 | #include "exec_cmd.h" | |
3 | #include "help.h" | |
4 | #include "run-command.h" | |
5 | ||
6 | const char git_usage_string[] = | |
7 | "git [--version] [--help] [-C <path>] [-c name=value]\n" | |
8 | " [--exec-path[=<path>]] [--html-path] [--man-path] [--info-path]\n" | |
9 | " [-p | --paginate | --no-pager] [--no-replace-objects] [--bare]\n" | |
10 | " [--git-dir=<path>] [--work-tree=<path>] [--namespace=<name>]\n" | |
11 | " <command> [<args>]"; | |
12 | ||
13 | const char git_more_info_string[] = | |
14 | N_("'git help -a' and 'git help -g' list available subcommands and some\n" | |
15 | "concept guides. See 'git help <command>' or 'git help <concept>'\n" | |
16 | "to read about a specific subcommand or concept."); | |
17 | ||
18 | static struct startup_info git_startup_info; | |
19 | static int use_pager = -1; | |
20 | static char *orig_cwd; | |
21 | static const char *env_names[] = { | |
22 | GIT_DIR_ENVIRONMENT, | |
23 | GIT_WORK_TREE_ENVIRONMENT, | |
24 | GIT_IMPLICIT_WORK_TREE_ENVIRONMENT, | |
25 | GIT_PREFIX_ENVIRONMENT | |
26 | }; | |
27 | static char *orig_env[4]; | |
28 | static int saved_environment; | |
29 | ||
30 | static void save_env(void) | |
31 | { | |
32 | int i; | |
33 | if (saved_environment) | |
34 | return; | |
35 | saved_environment = 1; | |
36 | orig_cwd = xgetcwd(); | |
37 | for (i = 0; i < ARRAY_SIZE(env_names); i++) { | |
38 | orig_env[i] = getenv(env_names[i]); | |
39 | if (orig_env[i]) | |
40 | orig_env[i] = xstrdup(orig_env[i]); | |
41 | } | |
42 | } | |
43 | ||
44 | static void restore_env(void) | |
45 | { | |
46 | int i; | |
47 | if (orig_cwd && chdir(orig_cwd)) | |
48 | die_errno("could not move to %s", orig_cwd); | |
49 | free(orig_cwd); | |
50 | for (i = 0; i < ARRAY_SIZE(env_names); i++) { | |
51 | if (orig_env[i]) | |
52 | setenv(env_names[i], orig_env[i], 1); | |
53 | else | |
54 | unsetenv(env_names[i]); | |
55 | } | |
56 | } | |
57 | ||
58 | static void commit_pager_choice(void) { | |
59 | switch (use_pager) { | |
60 | case 0: | |
61 | setenv("GIT_PAGER", "cat", 1); | |
62 | break; | |
63 | case 1: | |
64 | setup_pager(); | |
65 | break; | |
66 | default: | |
67 | break; | |
68 | } | |
69 | } | |
70 | ||
71 | static int handle_options(const char ***argv, int *argc, int *envchanged) | |
72 | { | |
73 | const char **orig_argv = *argv; | |
74 | ||
75 | while (*argc > 0) { | |
76 | const char *cmd = (*argv)[0]; | |
77 | if (cmd[0] != '-') | |
78 | break; | |
79 | ||
80 | /* | |
81 | * For legacy reasons, the "version" and "help" | |
82 | * commands can be written with "--" prepended | |
83 | * to make them look like flags. | |
84 | */ | |
85 | if (!strcmp(cmd, "--help") || !strcmp(cmd, "--version")) | |
86 | break; | |
87 | ||
88 | /* | |
89 | * Check remaining flags. | |
90 | */ | |
91 | if (skip_prefix(cmd, "--exec-path", &cmd)) { | |
92 | if (*cmd == '=') | |
93 | git_set_argv_exec_path(cmd + 1); | |
94 | else { | |
95 | puts(git_exec_path()); | |
96 | exit(0); | |
97 | } | |
98 | } else if (!strcmp(cmd, "--html-path")) { | |
99 | puts(system_path(GIT_HTML_PATH)); | |
100 | exit(0); | |
101 | } else if (!strcmp(cmd, "--man-path")) { | |
102 | puts(system_path(GIT_MAN_PATH)); | |
103 | exit(0); | |
104 | } else if (!strcmp(cmd, "--info-path")) { | |
105 | puts(system_path(GIT_INFO_PATH)); | |
106 | exit(0); | |
107 | } else if (!strcmp(cmd, "-p") || !strcmp(cmd, "--paginate")) { | |
108 | use_pager = 1; | |
109 | } else if (!strcmp(cmd, "--no-pager")) { | |
110 | use_pager = 0; | |
111 | if (envchanged) | |
112 | *envchanged = 1; | |
113 | } else if (!strcmp(cmd, "--no-replace-objects")) { | |
114 | check_replace_refs = 0; | |
115 | setenv(NO_REPLACE_OBJECTS_ENVIRONMENT, "1", 1); | |
116 | if (envchanged) | |
117 | *envchanged = 1; | |
118 | } else if (!strcmp(cmd, "--git-dir")) { | |
119 | if (*argc < 2) { | |
120 | fprintf(stderr, "No directory given for --git-dir.\n" ); | |
121 | usage(git_usage_string); | |
122 | } | |
123 | setenv(GIT_DIR_ENVIRONMENT, (*argv)[1], 1); | |
124 | if (envchanged) | |
125 | *envchanged = 1; | |
126 | (*argv)++; | |
127 | (*argc)--; | |
128 | } else if (skip_prefix(cmd, "--git-dir=", &cmd)) { | |
129 | setenv(GIT_DIR_ENVIRONMENT, cmd, 1); | |
130 | if (envchanged) | |
131 | *envchanged = 1; | |
132 | } else if (!strcmp(cmd, "--namespace")) { | |
133 | if (*argc < 2) { | |
134 | fprintf(stderr, "No namespace given for --namespace.\n" ); | |
135 | usage(git_usage_string); | |
136 | } | |
137 | setenv(GIT_NAMESPACE_ENVIRONMENT, (*argv)[1], 1); | |
138 | if (envchanged) | |
139 | *envchanged = 1; | |
140 | (*argv)++; | |
141 | (*argc)--; | |
142 | } else if (skip_prefix(cmd, "--namespace=", &cmd)) { | |
143 | setenv(GIT_NAMESPACE_ENVIRONMENT, cmd, 1); | |
144 | if (envchanged) | |
145 | *envchanged = 1; | |
146 | } else if (!strcmp(cmd, "--work-tree")) { | |
147 | if (*argc < 2) { | |
148 | fprintf(stderr, "No directory given for --work-tree.\n" ); | |
149 | usage(git_usage_string); | |
150 | } | |
151 | setenv(GIT_WORK_TREE_ENVIRONMENT, (*argv)[1], 1); | |
152 | if (envchanged) | |
153 | *envchanged = 1; | |
154 | (*argv)++; | |
155 | (*argc)--; | |
156 | } else if (skip_prefix(cmd, "--work-tree=", &cmd)) { | |
157 | setenv(GIT_WORK_TREE_ENVIRONMENT, cmd, 1); | |
158 | if (envchanged) | |
159 | *envchanged = 1; | |
160 | } else if (!strcmp(cmd, "--bare")) { | |
161 | char *cwd = xgetcwd(); | |
162 | is_bare_repository_cfg = 1; | |
163 | setenv(GIT_DIR_ENVIRONMENT, cwd, 0); | |
164 | free(cwd); | |
165 | setenv(GIT_IMPLICIT_WORK_TREE_ENVIRONMENT, "0", 1); | |
166 | if (envchanged) | |
167 | *envchanged = 1; | |
168 | } else if (!strcmp(cmd, "-c")) { | |
169 | if (*argc < 2) { | |
170 | fprintf(stderr, "-c expects a configuration string\n" ); | |
171 | usage(git_usage_string); | |
172 | } | |
173 | git_config_push_parameter((*argv)[1]); | |
174 | (*argv)++; | |
175 | (*argc)--; | |
176 | } else if (!strcmp(cmd, "--literal-pathspecs")) { | |
177 | setenv(GIT_LITERAL_PATHSPECS_ENVIRONMENT, "1", 1); | |
178 | if (envchanged) | |
179 | *envchanged = 1; | |
180 | } else if (!strcmp(cmd, "--no-literal-pathspecs")) { | |
181 | setenv(GIT_LITERAL_PATHSPECS_ENVIRONMENT, "0", 1); | |
182 | if (envchanged) | |
183 | *envchanged = 1; | |
184 | } else if (!strcmp(cmd, "--glob-pathspecs")) { | |
185 | setenv(GIT_GLOB_PATHSPECS_ENVIRONMENT, "1", 1); | |
186 | if (envchanged) | |
187 | *envchanged = 1; | |
188 | } else if (!strcmp(cmd, "--noglob-pathspecs")) { | |
189 | setenv(GIT_NOGLOB_PATHSPECS_ENVIRONMENT, "1", 1); | |
190 | if (envchanged) | |
191 | *envchanged = 1; | |
192 | } else if (!strcmp(cmd, "--icase-pathspecs")) { | |
193 | setenv(GIT_ICASE_PATHSPECS_ENVIRONMENT, "1", 1); | |
194 | if (envchanged) | |
195 | *envchanged = 1; | |
196 | } else if (!strcmp(cmd, "--shallow-file")) { | |
197 | (*argv)++; | |
198 | (*argc)--; | |
199 | set_alternate_shallow_file((*argv)[0], 1); | |
200 | if (envchanged) | |
201 | *envchanged = 1; | |
202 | } else if (!strcmp(cmd, "-C")) { | |
203 | if (*argc < 2) { | |
204 | fprintf(stderr, "No directory given for -C.\n" ); | |
205 | usage(git_usage_string); | |
206 | } | |
207 | if ((*argv)[1][0]) { | |
208 | if (chdir((*argv)[1])) | |
209 | die_errno("Cannot change to '%s'", (*argv)[1]); | |
210 | if (envchanged) | |
211 | *envchanged = 1; | |
212 | } | |
213 | (*argv)++; | |
214 | (*argc)--; | |
215 | } else { | |
216 | fprintf(stderr, "Unknown option: %s\n", cmd); | |
217 | usage(git_usage_string); | |
218 | } | |
219 | ||
220 | (*argv)++; | |
221 | (*argc)--; | |
222 | } | |
223 | return (*argv) - orig_argv; | |
224 | } | |
225 | ||
226 | static int handle_alias(int *argcp, const char ***argv) | |
227 | { | |
228 | int envchanged = 0, ret = 0, saved_errno = errno; | |
229 | const char *subdir; | |
230 | int count, option_count; | |
231 | const char **new_argv; | |
232 | const char *alias_command; | |
233 | char *alias_string; | |
234 | int unused_nongit; | |
235 | ||
236 | subdir = setup_git_directory_gently(&unused_nongit); | |
237 | ||
238 | alias_command = (*argv)[0]; | |
239 | alias_string = alias_lookup(alias_command); | |
240 | if (alias_string) { | |
241 | if (alias_string[0] == '!') { | |
242 | const char **alias_argv; | |
243 | int argc = *argcp, i; | |
244 | ||
245 | commit_pager_choice(); | |
246 | ||
247 | /* build alias_argv */ | |
248 | alias_argv = xmalloc(sizeof(*alias_argv) * (argc + 1)); | |
249 | alias_argv[0] = alias_string + 1; | |
250 | for (i = 1; i < argc; ++i) | |
251 | alias_argv[i] = (*argv)[i]; | |
252 | alias_argv[argc] = NULL; | |
253 | ||
254 | ret = run_command_v_opt(alias_argv, RUN_USING_SHELL); | |
255 | if (ret >= 0) /* normal exit */ | |
256 | exit(ret); | |
257 | ||
258 | die_errno("While expanding alias '%s': '%s'", | |
259 | alias_command, alias_string + 1); | |
260 | } | |
261 | count = split_cmdline(alias_string, &new_argv); | |
262 | if (count < 0) | |
263 | die("Bad alias.%s string: %s", alias_command, | |
264 | split_cmdline_strerror(count)); | |
265 | option_count = handle_options(&new_argv, &count, &envchanged); | |
266 | if (envchanged) | |
267 | die("alias '%s' changes environment variables\n" | |
268 | "You can use '!git' in the alias to do this.", | |
269 | alias_command); | |
270 | memmove(new_argv - option_count, new_argv, | |
271 | count * sizeof(char *)); | |
272 | new_argv -= option_count; | |
273 | ||
274 | if (count < 1) | |
275 | die("empty alias for %s", alias_command); | |
276 | ||
277 | if (!strcmp(alias_command, new_argv[0])) | |
278 | die("recursive alias: %s", alias_command); | |
279 | ||
280 | trace_argv_printf(new_argv, | |
281 | "trace: alias expansion: %s =>", | |
282 | alias_command); | |
283 | ||
284 | REALLOC_ARRAY(new_argv, count + *argcp); | |
285 | /* insert after command name */ | |
286 | memcpy(new_argv + count, *argv + 1, sizeof(char *) * *argcp); | |
287 | ||
288 | *argv = new_argv; | |
289 | *argcp += count - 1; | |
290 | ||
291 | ret = 1; | |
292 | } | |
293 | ||
294 | if (subdir && chdir(subdir)) | |
295 | die_errno("Cannot change to '%s'", subdir); | |
296 | ||
297 | errno = saved_errno; | |
298 | ||
299 | return ret; | |
300 | } | |
301 | ||
302 | #define RUN_SETUP (1<<0) | |
303 | #define RUN_SETUP_GENTLY (1<<1) | |
304 | #define USE_PAGER (1<<2) | |
305 | /* | |
306 | * require working tree to be present -- anything uses this needs | |
307 | * RUN_SETUP for reading from the configuration file. | |
308 | */ | |
309 | #define NEED_WORK_TREE (1<<3) | |
310 | #define NO_SETUP (1<<4) | |
311 | ||
312 | struct cmd_struct { | |
313 | const char *cmd; | |
314 | int (*fn)(int, const char **, const char *); | |
315 | int option; | |
316 | }; | |
317 | ||
318 | static int run_builtin(struct cmd_struct *p, int argc, const char **argv) | |
319 | { | |
320 | int status, help; | |
321 | struct stat st; | |
322 | const char *prefix; | |
323 | ||
324 | prefix = NULL; | |
325 | help = argc == 2 && !strcmp(argv[1], "-h"); | |
326 | if (!help) { | |
327 | if (p->option & RUN_SETUP) | |
328 | prefix = setup_git_directory(); | |
329 | else if (p->option & RUN_SETUP_GENTLY) { | |
330 | int nongit_ok; | |
331 | prefix = setup_git_directory_gently(&nongit_ok); | |
332 | } | |
333 | ||
334 | if (use_pager == -1 && p->option & (RUN_SETUP | RUN_SETUP_GENTLY)) | |
335 | use_pager = check_pager_config(p->cmd); | |
336 | if (use_pager == -1 && p->option & USE_PAGER) | |
337 | use_pager = 1; | |
338 | ||
339 | if ((p->option & (RUN_SETUP | RUN_SETUP_GENTLY)) && | |
340 | startup_info->have_repository) /* get_git_dir() may set up repo, avoid that */ | |
341 | trace_repo_setup(prefix); | |
342 | } | |
343 | commit_pager_choice(); | |
344 | ||
345 | if (!help && p->option & NEED_WORK_TREE) | |
346 | setup_work_tree(); | |
347 | ||
348 | trace_argv_printf(argv, "trace: built-in: git"); | |
349 | ||
350 | status = p->fn(argc, argv, prefix); | |
351 | if (status) | |
352 | return status; | |
353 | ||
354 | /* Somebody closed stdout? */ | |
355 | if (fstat(fileno(stdout), &st)) | |
356 | return 0; | |
357 | /* Ignore write errors for pipes and sockets.. */ | |
358 | if (S_ISFIFO(st.st_mode) || S_ISSOCK(st.st_mode)) | |
359 | return 0; | |
360 | ||
361 | /* Check for ENOSPC and EIO errors.. */ | |
362 | if (fflush(stdout)) | |
363 | die_errno("write failure on standard output"); | |
364 | if (ferror(stdout)) | |
365 | die("unknown write failure on standard output"); | |
366 | if (fclose(stdout)) | |
367 | die_errno("close failed on standard output"); | |
368 | return 0; | |
369 | } | |
370 | ||
371 | static struct cmd_struct commands[] = { | |
372 | { "add", cmd_add, RUN_SETUP | NEED_WORK_TREE }, | |
373 | { "annotate", cmd_annotate, RUN_SETUP }, | |
374 | { "apply", cmd_apply, RUN_SETUP_GENTLY }, | |
375 | { "archive", cmd_archive }, | |
376 | { "bisect--helper", cmd_bisect__helper, RUN_SETUP }, | |
377 | { "blame", cmd_blame, RUN_SETUP }, | |
378 | { "branch", cmd_branch, RUN_SETUP }, | |
379 | { "bundle", cmd_bundle, RUN_SETUP_GENTLY }, | |
380 | { "cat-file", cmd_cat_file, RUN_SETUP }, | |
381 | { "check-attr", cmd_check_attr, RUN_SETUP }, | |
382 | { "check-ignore", cmd_check_ignore, RUN_SETUP | NEED_WORK_TREE }, | |
383 | { "check-mailmap", cmd_check_mailmap, RUN_SETUP }, | |
384 | { "check-ref-format", cmd_check_ref_format }, | |
385 | { "checkout", cmd_checkout, RUN_SETUP }, | |
386 | { "checkout-index", cmd_checkout_index, | |
387 | RUN_SETUP | NEED_WORK_TREE}, | |
388 | { "cherry", cmd_cherry, RUN_SETUP }, | |
389 | { "cherry-pick", cmd_cherry_pick, RUN_SETUP | NEED_WORK_TREE }, | |
390 | { "clean", cmd_clean, RUN_SETUP | NEED_WORK_TREE }, | |
391 | { "clone", cmd_clone, NO_SETUP }, | |
392 | { "column", cmd_column, RUN_SETUP_GENTLY }, | |
393 | { "commit", cmd_commit, RUN_SETUP | NEED_WORK_TREE }, | |
394 | { "commit-tree", cmd_commit_tree, RUN_SETUP }, | |
395 | { "config", cmd_config, RUN_SETUP_GENTLY }, | |
396 | { "count-objects", cmd_count_objects, RUN_SETUP }, | |
397 | { "credential", cmd_credential, RUN_SETUP_GENTLY }, | |
398 | { "describe", cmd_describe, RUN_SETUP }, | |
399 | { "diff", cmd_diff }, | |
400 | { "diff-files", cmd_diff_files, RUN_SETUP | NEED_WORK_TREE }, | |
401 | { "diff-index", cmd_diff_index, RUN_SETUP }, | |
402 | { "diff-tree", cmd_diff_tree, RUN_SETUP }, | |
403 | { "fast-export", cmd_fast_export, RUN_SETUP }, | |
404 | { "fetch", cmd_fetch, RUN_SETUP }, | |
405 | { "fetch-pack", cmd_fetch_pack, RUN_SETUP }, | |
406 | { "fmt-merge-msg", cmd_fmt_merge_msg, RUN_SETUP }, | |
407 | { "for-each-ref", cmd_for_each_ref, RUN_SETUP }, | |
408 | { "format-patch", cmd_format_patch, RUN_SETUP }, | |
409 | { "fsck", cmd_fsck, RUN_SETUP }, | |
410 | { "fsck-objects", cmd_fsck, RUN_SETUP }, | |
411 | { "gc", cmd_gc, RUN_SETUP }, | |
412 | { "get-tar-commit-id", cmd_get_tar_commit_id }, | |
413 | { "grep", cmd_grep, RUN_SETUP_GENTLY }, | |
414 | { "hash-object", cmd_hash_object }, | |
415 | { "help", cmd_help }, | |
416 | { "index-pack", cmd_index_pack, RUN_SETUP_GENTLY }, | |
417 | { "init", cmd_init_db, NO_SETUP }, | |
418 | { "init-db", cmd_init_db, NO_SETUP }, | |
419 | { "interpret-trailers", cmd_interpret_trailers, RUN_SETUP }, | |
420 | { "log", cmd_log, RUN_SETUP }, | |
421 | { "ls-files", cmd_ls_files, RUN_SETUP }, | |
422 | { "ls-remote", cmd_ls_remote, RUN_SETUP_GENTLY }, | |
423 | { "ls-tree", cmd_ls_tree, RUN_SETUP }, | |
424 | { "mailinfo", cmd_mailinfo }, | |
425 | { "mailsplit", cmd_mailsplit }, | |
426 | { "merge", cmd_merge, RUN_SETUP | NEED_WORK_TREE }, | |
427 | { "merge-base", cmd_merge_base, RUN_SETUP }, | |
428 | { "merge-file", cmd_merge_file, RUN_SETUP_GENTLY }, | |
429 | { "merge-index", cmd_merge_index, RUN_SETUP }, | |
430 | { "merge-ours", cmd_merge_ours, RUN_SETUP }, | |
431 | { "merge-recursive", cmd_merge_recursive, RUN_SETUP | NEED_WORK_TREE }, | |
432 | { "merge-recursive-ours", cmd_merge_recursive, RUN_SETUP | NEED_WORK_TREE }, | |
433 | { "merge-recursive-theirs", cmd_merge_recursive, RUN_SETUP | NEED_WORK_TREE }, | |
434 | { "merge-subtree", cmd_merge_recursive, RUN_SETUP | NEED_WORK_TREE }, | |
435 | { "merge-tree", cmd_merge_tree, RUN_SETUP }, | |
436 | { "mktag", cmd_mktag, RUN_SETUP }, | |
437 | { "mktree", cmd_mktree, RUN_SETUP }, | |
438 | { "mv", cmd_mv, RUN_SETUP | NEED_WORK_TREE }, | |
439 | { "name-rev", cmd_name_rev, RUN_SETUP }, | |
440 | { "notes", cmd_notes, RUN_SETUP }, | |
441 | { "pack-objects", cmd_pack_objects, RUN_SETUP }, | |
442 | { "pack-redundant", cmd_pack_redundant, RUN_SETUP }, | |
443 | { "pack-refs", cmd_pack_refs, RUN_SETUP }, | |
444 | { "patch-id", cmd_patch_id }, | |
445 | { "pickaxe", cmd_blame, RUN_SETUP }, | |
446 | { "prune", cmd_prune, RUN_SETUP }, | |
447 | { "prune-packed", cmd_prune_packed, RUN_SETUP }, | |
448 | { "push", cmd_push, RUN_SETUP }, | |
449 | { "read-tree", cmd_read_tree, RUN_SETUP }, | |
450 | { "receive-pack", cmd_receive_pack }, | |
451 | { "reflog", cmd_reflog, RUN_SETUP }, | |
452 | { "remote", cmd_remote, RUN_SETUP }, | |
453 | { "remote-ext", cmd_remote_ext }, | |
454 | { "remote-fd", cmd_remote_fd }, | |
455 | { "repack", cmd_repack, RUN_SETUP }, | |
456 | { "replace", cmd_replace, RUN_SETUP }, | |
457 | { "rerere", cmd_rerere, RUN_SETUP }, | |
458 | { "reset", cmd_reset, RUN_SETUP }, | |
459 | { "rev-list", cmd_rev_list, RUN_SETUP }, | |
460 | { "rev-parse", cmd_rev_parse }, | |
461 | { "revert", cmd_revert, RUN_SETUP | NEED_WORK_TREE }, | |
462 | { "rm", cmd_rm, RUN_SETUP }, | |
463 | { "send-pack", cmd_send_pack, RUN_SETUP }, | |
464 | { "shortlog", cmd_shortlog, RUN_SETUP_GENTLY | USE_PAGER }, | |
465 | { "show", cmd_show, RUN_SETUP }, | |
466 | { "show-branch", cmd_show_branch, RUN_SETUP }, | |
467 | { "show-ref", cmd_show_ref, RUN_SETUP }, | |
468 | { "stage", cmd_add, RUN_SETUP | NEED_WORK_TREE }, | |
469 | { "status", cmd_status, RUN_SETUP | NEED_WORK_TREE }, | |
470 | { "stripspace", cmd_stripspace }, | |
471 | { "symbolic-ref", cmd_symbolic_ref, RUN_SETUP }, | |
472 | { "tag", cmd_tag, RUN_SETUP }, | |
473 | { "unpack-file", cmd_unpack_file, RUN_SETUP }, | |
474 | { "unpack-objects", cmd_unpack_objects, RUN_SETUP }, | |
475 | { "update-index", cmd_update_index, RUN_SETUP }, | |
476 | { "update-ref", cmd_update_ref, RUN_SETUP }, | |
477 | { "update-server-info", cmd_update_server_info, RUN_SETUP }, | |
478 | { "upload-archive", cmd_upload_archive }, | |
479 | { "upload-archive--writer", cmd_upload_archive_writer }, | |
480 | { "var", cmd_var, RUN_SETUP_GENTLY }, | |
481 | { "verify-commit", cmd_verify_commit, RUN_SETUP }, | |
482 | { "verify-pack", cmd_verify_pack }, | |
483 | { "verify-tag", cmd_verify_tag, RUN_SETUP }, | |
484 | { "version", cmd_version }, | |
485 | { "whatchanged", cmd_whatchanged, RUN_SETUP }, | |
486 | { "write-tree", cmd_write_tree, RUN_SETUP }, | |
487 | }; | |
488 | ||
489 | static struct cmd_struct *get_builtin(const char *s) | |
490 | { | |
491 | int i; | |
492 | for (i = 0; i < ARRAY_SIZE(commands); i++) { | |
493 | struct cmd_struct *p = commands + i; | |
494 | if (!strcmp(s, p->cmd)) | |
495 | return p; | |
496 | } | |
497 | return NULL; | |
498 | } | |
499 | ||
500 | int is_builtin(const char *s) | |
501 | { | |
502 | return !!get_builtin(s); | |
503 | } | |
504 | ||
505 | static void handle_builtin(int argc, const char **argv) | |
506 | { | |
507 | const char *cmd = argv[0]; | |
508 | int i; | |
509 | static const char ext[] = STRIP_EXTENSION; | |
510 | struct cmd_struct *builtin; | |
511 | ||
512 | if (sizeof(ext) > 1) { | |
513 | i = strlen(argv[0]) - strlen(ext); | |
514 | if (i > 0 && !strcmp(argv[0] + i, ext)) { | |
515 | char *argv0 = xstrdup(argv[0]); | |
516 | argv[0] = cmd = argv0; | |
517 | argv0[i] = '\0'; | |
518 | } | |
519 | } | |
520 | ||
521 | /* Turn "git cmd --help" into "git help cmd" */ | |
522 | if (argc > 1 && !strcmp(argv[1], "--help")) { | |
523 | argv[1] = argv[0]; | |
524 | argv[0] = cmd = "help"; | |
525 | } | |
526 | ||
527 | builtin = get_builtin(cmd); | |
528 | if (builtin) { | |
529 | if (saved_environment && (builtin->option & NO_SETUP)) | |
530 | restore_env(); | |
531 | else | |
532 | exit(run_builtin(builtin, argc, argv)); | |
533 | } | |
534 | } | |
535 | ||
536 | static void execv_dashed_external(const char **argv) | |
537 | { | |
538 | struct strbuf cmd = STRBUF_INIT; | |
539 | const char *tmp; | |
540 | int status; | |
541 | ||
542 | if (use_pager == -1) | |
543 | use_pager = check_pager_config(argv[0]); | |
544 | commit_pager_choice(); | |
545 | ||
546 | strbuf_addf(&cmd, "git-%s", argv[0]); | |
547 | ||
548 | /* | |
549 | * argv[0] must be the git command, but the argv array | |
550 | * belongs to the caller, and may be reused in | |
551 | * subsequent loop iterations. Save argv[0] and | |
552 | * restore it on error. | |
553 | */ | |
554 | tmp = argv[0]; | |
555 | argv[0] = cmd.buf; | |
556 | ||
557 | trace_argv_printf(argv, "trace: exec:"); | |
558 | ||
559 | /* | |
560 | * if we fail because the command is not found, it is | |
561 | * OK to return. Otherwise, we just pass along the status code. | |
562 | */ | |
563 | status = run_command_v_opt(argv, RUN_SILENT_EXEC_FAILURE | RUN_CLEAN_ON_EXIT); | |
564 | if (status >= 0 || errno != ENOENT) | |
565 | exit(status); | |
566 | ||
567 | argv[0] = tmp; | |
568 | ||
569 | strbuf_release(&cmd); | |
570 | } | |
571 | ||
572 | static int run_argv(int *argcp, const char ***argv) | |
573 | { | |
574 | int done_alias = 0; | |
575 | ||
576 | while (1) { | |
577 | /* See if it's a builtin */ | |
578 | handle_builtin(*argcp, *argv); | |
579 | ||
580 | /* .. then try the external ones */ | |
581 | execv_dashed_external(*argv); | |
582 | ||
583 | /* It could be an alias -- this works around the insanity | |
584 | * of overriding "git log" with "git show" by having | |
585 | * alias.log = show | |
586 | */ | |
587 | if (done_alias) | |
588 | break; | |
589 | save_env(); | |
590 | if (!handle_alias(argcp, argv)) | |
591 | break; | |
592 | done_alias = 1; | |
593 | } | |
594 | ||
595 | return done_alias; | |
596 | } | |
597 | ||
598 | /* | |
599 | * Many parts of Git have subprograms communicate via pipe, expect the | |
600 | * upstream of a pipe to die with SIGPIPE when the downstream of a | |
601 | * pipe does not need to read all that is written. Some third-party | |
602 | * programs that ignore or block SIGPIPE for their own reason forget | |
603 | * to restore SIGPIPE handling to the default before spawning Git and | |
604 | * break this carefully orchestrated machinery. | |
605 | * | |
606 | * Restore the way SIGPIPE is handled to default, which is what we | |
607 | * expect. | |
608 | */ | |
609 | static void restore_sigpipe_to_default(void) | |
610 | { | |
611 | sigset_t unblock; | |
612 | ||
613 | sigemptyset(&unblock); | |
614 | sigaddset(&unblock, SIGPIPE); | |
615 | sigprocmask(SIG_UNBLOCK, &unblock, NULL); | |
616 | signal(SIGPIPE, SIG_DFL); | |
617 | } | |
618 | ||
619 | int main(int argc, char **av) | |
620 | { | |
621 | const char **argv = (const char **) av; | |
622 | const char *cmd; | |
623 | int done_help = 0; | |
624 | ||
625 | startup_info = &git_startup_info; | |
626 | ||
627 | cmd = git_extract_argv0_path(argv[0]); | |
628 | if (!cmd) | |
629 | cmd = "git-help"; | |
630 | ||
631 | /* | |
632 | * Always open file descriptors 0/1/2 to avoid clobbering files | |
633 | * in die(). It also avoids messing up when the pipes are dup'ed | |
634 | * onto stdin/stdout/stderr in the child processes we spawn. | |
635 | */ | |
636 | sanitize_stdfds(); | |
637 | ||
638 | restore_sigpipe_to_default(); | |
639 | ||
640 | git_setup_gettext(); | |
641 | ||
642 | trace_command_performance(argv); | |
643 | ||
644 | /* | |
645 | * "git-xxxx" is the same as "git xxxx", but we obviously: | |
646 | * | |
647 | * - cannot take flags in between the "git" and the "xxxx". | |
648 | * - cannot execute it externally (since it would just do | |
649 | * the same thing over again) | |
650 | * | |
651 | * So we just directly call the builtin handler, and die if | |
652 | * that one cannot handle it. | |
653 | */ | |
654 | if (skip_prefix(cmd, "git-", &cmd)) { | |
655 | argv[0] = cmd; | |
656 | handle_builtin(argc, argv); | |
657 | die("cannot handle %s as a builtin", cmd); | |
658 | } | |
659 | ||
660 | /* Look for flags.. */ | |
661 | argv++; | |
662 | argc--; | |
663 | handle_options(&argv, &argc, NULL); | |
664 | if (argc > 0) { | |
665 | /* translate --help and --version into commands */ | |
666 | skip_prefix(argv[0], "--", &argv[0]); | |
667 | } else { | |
668 | /* The user didn't specify a command; give them help */ | |
669 | commit_pager_choice(); | |
670 | printf("usage: %s\n\n", git_usage_string); | |
671 | list_common_cmds_help(); | |
672 | printf("\n%s\n", _(git_more_info_string)); | |
673 | exit(1); | |
674 | } | |
675 | cmd = argv[0]; | |
676 | ||
677 | /* | |
678 | * We use PATH to find git commands, but we prepend some higher | |
679 | * precedence paths: the "--exec-path" option, the GIT_EXEC_PATH | |
680 | * environment, and the $(gitexecdir) from the Makefile at build | |
681 | * time. | |
682 | */ | |
683 | setup_path(); | |
684 | ||
685 | while (1) { | |
686 | int was_alias = run_argv(&argc, &argv); | |
687 | if (errno != ENOENT) | |
688 | break; | |
689 | if (was_alias) { | |
690 | fprintf(stderr, "Expansion of alias '%s' failed; " | |
691 | "'%s' is not a git command\n", | |
692 | cmd, argv[0]); | |
693 | exit(1); | |
694 | } | |
695 | if (!done_help) { | |
696 | cmd = argv[0] = help_unknown_cmd(cmd); | |
697 | done_help = 1; | |
698 | } else | |
699 | break; | |
700 | } | |
701 | ||
702 | fprintf(stderr, "Failed to run command '%s': %s\n", | |
703 | cmd, strerror(errno)); | |
704 | ||
705 | return 1; | |
706 | } |