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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 use_pager = -1; | |
13 | struct pager_config { | |
14 | const char *cmd; | |
15 | int val; | |
16 | }; | |
17 | ||
18 | static int pager_command_config(const char *var, const char *value, void *data) | |
19 | { | |
20 | struct pager_config *c = data; | |
21 | if (!prefixcmp(var, "pager.") && !strcmp(var + 6, c->cmd)) | |
22 | c->val = git_config_bool(var, value); | |
23 | return 0; | |
24 | } | |
25 | ||
26 | /* returns 0 for "no pager", 1 for "use pager", and -1 for "not specified" */ | |
27 | int check_pager_config(const char *cmd) | |
28 | { | |
29 | struct pager_config c; | |
30 | c.cmd = cmd; | |
31 | c.val = -1; | |
32 | git_config(pager_command_config, &c); | |
33 | return c.val; | |
34 | } | |
35 | ||
36 | static void commit_pager_choice(void) { | |
37 | switch (use_pager) { | |
38 | case 0: | |
39 | setenv("GIT_PAGER", "cat", 1); | |
40 | break; | |
41 | case 1: | |
42 | setup_pager(); | |
43 | break; | |
44 | default: | |
45 | break; | |
46 | } | |
47 | } | |
48 | ||
49 | static int handle_options(const char*** argv, int* argc, int* envchanged) | |
50 | { | |
51 | int handled = 0; | |
52 | ||
53 | while (*argc > 0) { | |
54 | const char *cmd = (*argv)[0]; | |
55 | if (cmd[0] != '-') | |
56 | break; | |
57 | ||
58 | /* | |
59 | * For legacy reasons, the "version" and "help" | |
60 | * commands can be written with "--" prepended | |
61 | * to make them look like flags. | |
62 | */ | |
63 | if (!strcmp(cmd, "--help") || !strcmp(cmd, "--version")) | |
64 | break; | |
65 | ||
66 | /* | |
67 | * Check remaining flags. | |
68 | */ | |
69 | if (!prefixcmp(cmd, "--exec-path")) { | |
70 | cmd += 11; | |
71 | if (*cmd == '=') | |
72 | git_set_argv_exec_path(cmd + 1); | |
73 | else { | |
74 | puts(git_exec_path()); | |
75 | exit(0); | |
76 | } | |
77 | } else if (!strcmp(cmd, "-p") || !strcmp(cmd, "--paginate")) { | |
78 | use_pager = 1; | |
79 | } else if (!strcmp(cmd, "--no-pager")) { | |
80 | use_pager = 0; | |
81 | if (envchanged) | |
82 | *envchanged = 1; | |
83 | } else if (!strcmp(cmd, "--git-dir")) { | |
84 | if (*argc < 2) { | |
85 | fprintf(stderr, "No directory given for --git-dir.\n" ); | |
86 | usage(git_usage_string); | |
87 | } | |
88 | setenv(GIT_DIR_ENVIRONMENT, (*argv)[1], 1); | |
89 | if (envchanged) | |
90 | *envchanged = 1; | |
91 | (*argv)++; | |
92 | (*argc)--; | |
93 | handled++; | |
94 | } else if (!prefixcmp(cmd, "--git-dir=")) { | |
95 | setenv(GIT_DIR_ENVIRONMENT, cmd + 10, 1); | |
96 | if (envchanged) | |
97 | *envchanged = 1; | |
98 | } else if (!strcmp(cmd, "--work-tree")) { | |
99 | if (*argc < 2) { | |
100 | fprintf(stderr, "No directory given for --work-tree.\n" ); | |
101 | usage(git_usage_string); | |
102 | } | |
103 | setenv(GIT_WORK_TREE_ENVIRONMENT, (*argv)[1], 1); | |
104 | if (envchanged) | |
105 | *envchanged = 1; | |
106 | (*argv)++; | |
107 | (*argc)--; | |
108 | } else if (!prefixcmp(cmd, "--work-tree=")) { | |
109 | setenv(GIT_WORK_TREE_ENVIRONMENT, cmd + 12, 1); | |
110 | if (envchanged) | |
111 | *envchanged = 1; | |
112 | } else if (!strcmp(cmd, "--bare")) { | |
113 | static char git_dir[PATH_MAX+1]; | |
114 | is_bare_repository_cfg = 1; | |
115 | setenv(GIT_DIR_ENVIRONMENT, getcwd(git_dir, sizeof(git_dir)), 0); | |
116 | if (envchanged) | |
117 | *envchanged = 1; | |
118 | } else { | |
119 | fprintf(stderr, "Unknown option: %s\n", cmd); | |
120 | usage(git_usage_string); | |
121 | } | |
122 | ||
123 | (*argv)++; | |
124 | (*argc)--; | |
125 | handled++; | |
126 | } | |
127 | return handled; | |
128 | } | |
129 | ||
130 | static int handle_alias(int *argcp, const char ***argv) | |
131 | { | |
132 | int envchanged = 0, ret = 0, saved_errno = errno; | |
133 | const char *subdir; | |
134 | int count, option_count; | |
135 | const char** new_argv; | |
136 | const char *alias_command; | |
137 | char *alias_string; | |
138 | int unused_nongit; | |
139 | ||
140 | subdir = setup_git_directory_gently(&unused_nongit); | |
141 | ||
142 | alias_command = (*argv)[0]; | |
143 | alias_string = alias_lookup(alias_command); | |
144 | if (alias_string) { | |
145 | if (alias_string[0] == '!') { | |
146 | if (*argcp > 1) { | |
147 | struct strbuf buf; | |
148 | ||
149 | strbuf_init(&buf, PATH_MAX); | |
150 | strbuf_addstr(&buf, alias_string); | |
151 | sq_quote_argv(&buf, (*argv) + 1, PATH_MAX); | |
152 | free(alias_string); | |
153 | alias_string = buf.buf; | |
154 | } | |
155 | trace_printf("trace: alias to shell cmd: %s => %s\n", | |
156 | alias_command, alias_string + 1); | |
157 | ret = system(alias_string + 1); | |
158 | if (ret >= 0 && WIFEXITED(ret) && | |
159 | WEXITSTATUS(ret) != 127) | |
160 | exit(WEXITSTATUS(ret)); | |
161 | die("Failed to run '%s' when expanding alias '%s'\n", | |
162 | alias_string + 1, alias_command); | |
163 | } | |
164 | count = split_cmdline(alias_string, &new_argv); | |
165 | option_count = handle_options(&new_argv, &count, &envchanged); | |
166 | if (envchanged) | |
167 | die("alias '%s' changes environment variables\n" | |
168 | "You can use '!git' in the alias to do this.", | |
169 | alias_command); | |
170 | memmove(new_argv - option_count, new_argv, | |
171 | count * sizeof(char *)); | |
172 | new_argv -= option_count; | |
173 | ||
174 | if (count < 1) | |
175 | die("empty alias for %s", alias_command); | |
176 | ||
177 | if (!strcmp(alias_command, new_argv[0])) | |
178 | die("recursive alias: %s", alias_command); | |
179 | ||
180 | trace_argv_printf(new_argv, | |
181 | "trace: alias expansion: %s =>", | |
182 | alias_command); | |
183 | ||
184 | new_argv = xrealloc(new_argv, sizeof(char*) * | |
185 | (count + *argcp + 1)); | |
186 | /* insert after command name */ | |
187 | memcpy(new_argv + count, *argv + 1, sizeof(char*) * *argcp); | |
188 | new_argv[count+*argcp] = NULL; | |
189 | ||
190 | *argv = new_argv; | |
191 | *argcp += count - 1; | |
192 | ||
193 | ret = 1; | |
194 | } | |
195 | ||
196 | if (subdir) | |
197 | chdir(subdir); | |
198 | ||
199 | errno = saved_errno; | |
200 | ||
201 | return ret; | |
202 | } | |
203 | ||
204 | const char git_version_string[] = GIT_VERSION; | |
205 | ||
206 | #define RUN_SETUP (1<<0) | |
207 | #define USE_PAGER (1<<1) | |
208 | /* | |
209 | * require working tree to be present -- anything uses this needs | |
210 | * RUN_SETUP for reading from the configuration file. | |
211 | */ | |
212 | #define NEED_WORK_TREE (1<<2) | |
213 | ||
214 | struct cmd_struct { | |
215 | const char *cmd; | |
216 | int (*fn)(int, const char **, const char *); | |
217 | int option; | |
218 | }; | |
219 | ||
220 | static int run_command(struct cmd_struct *p, int argc, const char **argv) | |
221 | { | |
222 | int status; | |
223 | struct stat st; | |
224 | const char *prefix; | |
225 | ||
226 | prefix = NULL; | |
227 | if (p->option & RUN_SETUP) | |
228 | prefix = setup_git_directory(); | |
229 | ||
230 | if (use_pager == -1 && p->option & RUN_SETUP) | |
231 | use_pager = check_pager_config(p->cmd); | |
232 | if (use_pager == -1 && p->option & USE_PAGER) | |
233 | use_pager = 1; | |
234 | commit_pager_choice(); | |
235 | ||
236 | if (p->option & NEED_WORK_TREE) | |
237 | setup_work_tree(); | |
238 | ||
239 | trace_argv_printf(argv, "trace: built-in: git"); | |
240 | ||
241 | status = p->fn(argc, argv, prefix); | |
242 | if (status) | |
243 | return status & 0xff; | |
244 | ||
245 | /* Somebody closed stdout? */ | |
246 | if (fstat(fileno(stdout), &st)) | |
247 | return 0; | |
248 | /* Ignore write errors for pipes and sockets.. */ | |
249 | if (S_ISFIFO(st.st_mode) || S_ISSOCK(st.st_mode)) | |
250 | return 0; | |
251 | ||
252 | /* Check for ENOSPC and EIO errors.. */ | |
253 | if (fflush(stdout)) | |
254 | die("write failure on standard output: %s", strerror(errno)); | |
255 | if (ferror(stdout)) | |
256 | die("unknown write failure on standard output"); | |
257 | if (fclose(stdout)) | |
258 | die("close failed on standard output: %s", strerror(errno)); | |
259 | return 0; | |
260 | } | |
261 | ||
262 | static void handle_internal_command(int argc, const char **argv) | |
263 | { | |
264 | const char *cmd = argv[0]; | |
265 | static struct cmd_struct commands[] = { | |
266 | { "add", cmd_add, RUN_SETUP | NEED_WORK_TREE }, | |
267 | { "annotate", cmd_annotate, RUN_SETUP }, | |
268 | { "apply", cmd_apply }, | |
269 | { "archive", cmd_archive }, | |
270 | { "blame", cmd_blame, RUN_SETUP }, | |
271 | { "branch", cmd_branch, RUN_SETUP }, | |
272 | { "bundle", cmd_bundle }, | |
273 | { "cat-file", cmd_cat_file, RUN_SETUP }, | |
274 | { "checkout", cmd_checkout, RUN_SETUP | NEED_WORK_TREE }, | |
275 | { "checkout-index", cmd_checkout_index, | |
276 | RUN_SETUP | NEED_WORK_TREE}, | |
277 | { "check-ref-format", cmd_check_ref_format }, | |
278 | { "check-attr", cmd_check_attr, RUN_SETUP }, | |
279 | { "cherry", cmd_cherry, RUN_SETUP }, | |
280 | { "cherry-pick", cmd_cherry_pick, RUN_SETUP | NEED_WORK_TREE }, | |
281 | { "clone", cmd_clone }, | |
282 | { "clean", cmd_clean, RUN_SETUP | NEED_WORK_TREE }, | |
283 | { "commit", cmd_commit, RUN_SETUP | NEED_WORK_TREE }, | |
284 | { "commit-tree", cmd_commit_tree, RUN_SETUP }, | |
285 | { "config", cmd_config }, | |
286 | { "count-objects", cmd_count_objects, RUN_SETUP }, | |
287 | { "describe", cmd_describe, RUN_SETUP }, | |
288 | { "diff", cmd_diff }, | |
289 | { "diff-files", cmd_diff_files, RUN_SETUP }, | |
290 | { "diff-index", cmd_diff_index, RUN_SETUP }, | |
291 | { "diff-tree", cmd_diff_tree, RUN_SETUP }, | |
292 | { "fast-export", cmd_fast_export, RUN_SETUP }, | |
293 | { "fetch", cmd_fetch, RUN_SETUP }, | |
294 | { "fetch-pack", cmd_fetch_pack, RUN_SETUP }, | |
295 | { "fetch--tool", cmd_fetch__tool, RUN_SETUP }, | |
296 | { "fmt-merge-msg", cmd_fmt_merge_msg, RUN_SETUP }, | |
297 | { "for-each-ref", cmd_for_each_ref, RUN_SETUP }, | |
298 | { "format-patch", cmd_format_patch, RUN_SETUP }, | |
299 | { "fsck", cmd_fsck, RUN_SETUP }, | |
300 | { "fsck-objects", cmd_fsck, RUN_SETUP }, | |
301 | { "gc", cmd_gc, RUN_SETUP }, | |
302 | { "get-tar-commit-id", cmd_get_tar_commit_id }, | |
303 | { "grep", cmd_grep, RUN_SETUP | USE_PAGER }, | |
304 | { "help", cmd_help }, | |
305 | #ifndef NO_CURL | |
306 | { "http-fetch", cmd_http_fetch, RUN_SETUP }, | |
307 | #endif | |
308 | { "init", cmd_init_db }, | |
309 | { "init-db", cmd_init_db }, | |
310 | { "log", cmd_log, RUN_SETUP | USE_PAGER }, | |
311 | { "ls-files", cmd_ls_files, RUN_SETUP }, | |
312 | { "ls-tree", cmd_ls_tree, RUN_SETUP }, | |
313 | { "ls-remote", cmd_ls_remote }, | |
314 | { "mailinfo", cmd_mailinfo }, | |
315 | { "mailsplit", cmd_mailsplit }, | |
316 | { "merge", cmd_merge, RUN_SETUP | NEED_WORK_TREE }, | |
317 | { "merge-base", cmd_merge_base, RUN_SETUP }, | |
318 | { "merge-file", cmd_merge_file }, | |
319 | { "merge-ours", cmd_merge_ours, RUN_SETUP }, | |
320 | { "merge-recursive", cmd_merge_recursive, RUN_SETUP | NEED_WORK_TREE }, | |
321 | { "merge-subtree", cmd_merge_recursive, RUN_SETUP | NEED_WORK_TREE }, | |
322 | { "mv", cmd_mv, RUN_SETUP | NEED_WORK_TREE }, | |
323 | { "name-rev", cmd_name_rev, RUN_SETUP }, | |
324 | { "pack-objects", cmd_pack_objects, RUN_SETUP }, | |
325 | { "peek-remote", cmd_ls_remote }, | |
326 | { "pickaxe", cmd_blame, RUN_SETUP }, | |
327 | { "prune", cmd_prune, RUN_SETUP }, | |
328 | { "prune-packed", cmd_prune_packed, RUN_SETUP }, | |
329 | { "push", cmd_push, RUN_SETUP }, | |
330 | { "read-tree", cmd_read_tree, RUN_SETUP }, | |
331 | { "reflog", cmd_reflog, RUN_SETUP }, | |
332 | { "remote", cmd_remote, RUN_SETUP }, | |
333 | { "repo-config", cmd_config }, | |
334 | { "rerere", cmd_rerere, RUN_SETUP }, | |
335 | { "reset", cmd_reset, RUN_SETUP }, | |
336 | { "rev-list", cmd_rev_list, RUN_SETUP }, | |
337 | { "rev-parse", cmd_rev_parse }, | |
338 | { "revert", cmd_revert, RUN_SETUP | NEED_WORK_TREE }, | |
339 | { "rm", cmd_rm, RUN_SETUP }, | |
340 | { "send-pack", cmd_send_pack, RUN_SETUP }, | |
341 | { "shortlog", cmd_shortlog, USE_PAGER }, | |
342 | { "show-branch", cmd_show_branch, RUN_SETUP }, | |
343 | { "show", cmd_show, RUN_SETUP | USE_PAGER }, | |
344 | { "status", cmd_status, RUN_SETUP | NEED_WORK_TREE }, | |
345 | { "stripspace", cmd_stripspace }, | |
346 | { "symbolic-ref", cmd_symbolic_ref, RUN_SETUP }, | |
347 | { "tag", cmd_tag, RUN_SETUP }, | |
348 | { "tar-tree", cmd_tar_tree }, | |
349 | { "unpack-objects", cmd_unpack_objects, RUN_SETUP }, | |
350 | { "update-index", cmd_update_index, RUN_SETUP }, | |
351 | { "update-ref", cmd_update_ref, RUN_SETUP }, | |
352 | { "upload-archive", cmd_upload_archive }, | |
353 | { "verify-tag", cmd_verify_tag, RUN_SETUP }, | |
354 | { "version", cmd_version }, | |
355 | { "whatchanged", cmd_whatchanged, RUN_SETUP | USE_PAGER }, | |
356 | { "write-tree", cmd_write_tree, RUN_SETUP }, | |
357 | { "verify-pack", cmd_verify_pack }, | |
358 | { "show-ref", cmd_show_ref, RUN_SETUP }, | |
359 | { "pack-refs", cmd_pack_refs, RUN_SETUP }, | |
360 | }; | |
361 | int i; | |
362 | static const char ext[] = STRIP_EXTENSION; | |
363 | ||
364 | if (sizeof(ext) > 1) { | |
365 | i = strlen(argv[0]) - strlen(ext); | |
366 | if (i > 0 && !strcmp(argv[0] + i, ext)) { | |
367 | char *argv0 = strdup(argv[0]); | |
368 | argv[0] = cmd = argv0; | |
369 | argv0[i] = '\0'; | |
370 | } | |
371 | } | |
372 | ||
373 | /* Turn "git cmd --help" into "git help cmd" */ | |
374 | if (argc > 1 && !strcmp(argv[1], "--help")) { | |
375 | argv[1] = argv[0]; | |
376 | argv[0] = cmd = "help"; | |
377 | } | |
378 | ||
379 | for (i = 0; i < ARRAY_SIZE(commands); i++) { | |
380 | struct cmd_struct *p = commands+i; | |
381 | if (strcmp(p->cmd, cmd)) | |
382 | continue; | |
383 | exit(run_command(p, argc, argv)); | |
384 | } | |
385 | } | |
386 | ||
387 | static void execv_dashed_external(const char **argv) | |
388 | { | |
389 | struct strbuf cmd; | |
390 | const char *tmp; | |
391 | ||
392 | strbuf_init(&cmd, 0); | |
393 | strbuf_addf(&cmd, "git-%s", argv[0]); | |
394 | ||
395 | /* | |
396 | * argv[0] must be the git command, but the argv array | |
397 | * belongs to the caller, and may be reused in | |
398 | * subsequent loop iterations. Save argv[0] and | |
399 | * restore it on error. | |
400 | */ | |
401 | tmp = argv[0]; | |
402 | argv[0] = cmd.buf; | |
403 | ||
404 | trace_argv_printf(argv, "trace: exec:"); | |
405 | ||
406 | /* execvp() can only ever return if it fails */ | |
407 | execvp(cmd.buf, (char **)argv); | |
408 | ||
409 | trace_printf("trace: exec failed: %s\n", strerror(errno)); | |
410 | ||
411 | argv[0] = tmp; | |
412 | ||
413 | strbuf_release(&cmd); | |
414 | } | |
415 | ||
416 | ||
417 | int main(int argc, const char **argv) | |
418 | { | |
419 | const char *cmd = argv[0] && *argv[0] ? argv[0] : "git-help"; | |
420 | char *slash = (char *)cmd + strlen(cmd); | |
421 | int done_alias = 0; | |
422 | ||
423 | /* | |
424 | * Take the basename of argv[0] as the command | |
425 | * name, and the dirname as the default exec_path | |
426 | * if we don't have anything better. | |
427 | */ | |
428 | do | |
429 | --slash; | |
430 | while (cmd <= slash && !is_dir_sep(*slash)); | |
431 | if (cmd <= slash) { | |
432 | *slash++ = 0; | |
433 | git_set_argv0_path(cmd); | |
434 | cmd = slash; | |
435 | } | |
436 | ||
437 | /* | |
438 | * "git-xxxx" is the same as "git xxxx", but we obviously: | |
439 | * | |
440 | * - cannot take flags in between the "git" and the "xxxx". | |
441 | * - cannot execute it externally (since it would just do | |
442 | * the same thing over again) | |
443 | * | |
444 | * So we just directly call the internal command handler, and | |
445 | * die if that one cannot handle it. | |
446 | */ | |
447 | if (!prefixcmp(cmd, "git-")) { | |
448 | cmd += 4; | |
449 | argv[0] = cmd; | |
450 | handle_internal_command(argc, argv); | |
451 | die("cannot handle %s internally", cmd); | |
452 | } | |
453 | ||
454 | /* Look for flags.. */ | |
455 | argv++; | |
456 | argc--; | |
457 | handle_options(&argv, &argc, NULL); | |
458 | commit_pager_choice(); | |
459 | if (argc > 0) { | |
460 | if (!prefixcmp(argv[0], "--")) | |
461 | argv[0] += 2; | |
462 | } else { | |
463 | /* The user didn't specify a command; give them help */ | |
464 | printf("usage: %s\n\n", git_usage_string); | |
465 | list_common_cmds_help(); | |
466 | printf("\n%s\n", git_more_info_string); | |
467 | exit(1); | |
468 | } | |
469 | cmd = argv[0]; | |
470 | ||
471 | /* | |
472 | * We use PATH to find git commands, but we prepend some higher | |
473 | * precidence paths: the "--exec-path" option, the GIT_EXEC_PATH | |
474 | * environment, and the $(gitexecdir) from the Makefile at build | |
475 | * time. | |
476 | */ | |
477 | setup_path(); | |
478 | ||
479 | while (1) { | |
480 | /* See if it's an internal command */ | |
481 | handle_internal_command(argc, argv); | |
482 | ||
483 | /* .. then try the external ones */ | |
484 | execv_dashed_external(argv); | |
485 | ||
486 | /* It could be an alias -- this works around the insanity | |
487 | * of overriding "git log" with "git show" by having | |
488 | * alias.log = show | |
489 | */ | |
490 | if (done_alias || !handle_alias(&argc, &argv)) | |
491 | break; | |
492 | done_alias = 1; | |
493 | } | |
494 | ||
495 | if (errno == ENOENT) { | |
496 | if (done_alias) { | |
497 | fprintf(stderr, "Expansion of alias '%s' failed; " | |
498 | "'%s' is not a git-command\n", | |
499 | cmd, argv[0]); | |
500 | exit(1); | |
501 | } | |
502 | help_unknown_cmd(cmd); | |
503 | } | |
504 | ||
505 | fprintf(stderr, "Failed to run command '%s': %s\n", | |
506 | cmd, strerror(errno)); | |
507 | ||
508 | return 1; | |
509 | } |