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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 | 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, 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, | |
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, "trace: built-in: git"); | |
256 | ||
257 | status = p->fn(argc, argv, prefix); | |
258 | if (status) | |
259 | return status & 0xff; | |
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 | { "clean", cmd_clean, RUN_SETUP | NEED_WORK_TREE }, | |
297 | { "commit", cmd_commit, RUN_SETUP | NEED_WORK_TREE }, | |
298 | { "commit-tree", cmd_commit_tree, RUN_SETUP }, | |
299 | { "config", cmd_config }, | |
300 | { "count-objects", cmd_count_objects, RUN_SETUP }, | |
301 | { "describe", cmd_describe, RUN_SETUP }, | |
302 | { "diff", cmd_diff }, | |
303 | { "diff-files", cmd_diff_files }, | |
304 | { "diff-index", cmd_diff_index, RUN_SETUP }, | |
305 | { "diff-tree", cmd_diff_tree, RUN_SETUP }, | |
306 | { "fast-export", cmd_fast_export, RUN_SETUP }, | |
307 | { "fetch", cmd_fetch, RUN_SETUP }, | |
308 | { "fetch-pack", cmd_fetch_pack, RUN_SETUP }, | |
309 | { "fetch--tool", cmd_fetch__tool, RUN_SETUP }, | |
310 | { "fmt-merge-msg", cmd_fmt_merge_msg, RUN_SETUP }, | |
311 | { "for-each-ref", cmd_for_each_ref, RUN_SETUP }, | |
312 | { "format-patch", cmd_format_patch, RUN_SETUP }, | |
313 | { "fsck", cmd_fsck, RUN_SETUP }, | |
314 | { "fsck-objects", cmd_fsck, RUN_SETUP }, | |
315 | { "gc", cmd_gc, RUN_SETUP }, | |
316 | { "get-tar-commit-id", cmd_get_tar_commit_id }, | |
317 | { "grep", cmd_grep, RUN_SETUP | USE_PAGER }, | |
318 | { "help", cmd_help }, | |
319 | #ifndef NO_CURL | |
320 | { "http-fetch", cmd_http_fetch, RUN_SETUP }, | |
321 | #endif | |
322 | { "init", cmd_init_db }, | |
323 | { "init-db", cmd_init_db }, | |
324 | { "log", cmd_log, RUN_SETUP | USE_PAGER }, | |
325 | { "ls-files", cmd_ls_files, RUN_SETUP }, | |
326 | { "ls-tree", cmd_ls_tree, RUN_SETUP }, | |
327 | { "ls-remote", cmd_ls_remote }, | |
328 | { "mailinfo", cmd_mailinfo }, | |
329 | { "mailsplit", cmd_mailsplit }, | |
330 | { "merge-base", cmd_merge_base, RUN_SETUP }, | |
331 | { "merge-file", cmd_merge_file }, | |
332 | { "merge-ours", cmd_merge_ours, RUN_SETUP }, | |
333 | { "mv", cmd_mv, RUN_SETUP | NEED_WORK_TREE }, | |
334 | { "name-rev", cmd_name_rev, RUN_SETUP }, | |
335 | { "pack-objects", cmd_pack_objects, RUN_SETUP }, | |
336 | { "peek-remote", cmd_ls_remote }, | |
337 | { "pickaxe", cmd_blame, RUN_SETUP }, | |
338 | { "prune", cmd_prune, RUN_SETUP }, | |
339 | { "prune-packed", cmd_prune_packed, RUN_SETUP }, | |
340 | { "push", cmd_push, RUN_SETUP }, | |
341 | { "read-tree", cmd_read_tree, RUN_SETUP }, | |
342 | { "reflog", cmd_reflog, RUN_SETUP }, | |
343 | { "repo-config", cmd_config }, | |
344 | { "rerere", cmd_rerere, RUN_SETUP }, | |
345 | { "reset", cmd_reset, RUN_SETUP }, | |
346 | { "rev-list", cmd_rev_list, RUN_SETUP }, | |
347 | { "rev-parse", cmd_rev_parse }, | |
348 | { "revert", cmd_revert, RUN_SETUP | NEED_WORK_TREE }, | |
349 | { "rm", cmd_rm, RUN_SETUP }, | |
350 | { "send-pack", cmd_send_pack, RUN_SETUP }, | |
351 | { "shortlog", cmd_shortlog, RUN_SETUP | USE_PAGER }, | |
352 | { "show-branch", cmd_show_branch, RUN_SETUP }, | |
353 | { "show", cmd_show, RUN_SETUP | USE_PAGER }, | |
354 | { "status", cmd_status, RUN_SETUP | NEED_WORK_TREE }, | |
355 | { "stripspace", cmd_stripspace }, | |
356 | { "symbolic-ref", cmd_symbolic_ref, RUN_SETUP }, | |
357 | { "tag", cmd_tag, RUN_SETUP }, | |
358 | { "tar-tree", cmd_tar_tree }, | |
359 | { "unpack-objects", cmd_unpack_objects, RUN_SETUP }, | |
360 | { "update-index", cmd_update_index, RUN_SETUP }, | |
361 | { "update-ref", cmd_update_ref, RUN_SETUP }, | |
362 | { "upload-archive", cmd_upload_archive }, | |
363 | { "verify-tag", cmd_verify_tag, RUN_SETUP }, | |
364 | { "version", cmd_version }, | |
365 | { "whatchanged", cmd_whatchanged, RUN_SETUP | USE_PAGER }, | |
366 | { "write-tree", cmd_write_tree, RUN_SETUP }, | |
367 | { "verify-pack", cmd_verify_pack }, | |
368 | { "show-ref", cmd_show_ref, RUN_SETUP }, | |
369 | { "pack-refs", cmd_pack_refs, RUN_SETUP }, | |
370 | }; | |
371 | int i; | |
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 | int main(int argc, const char **argv) | |
388 | { | |
389 | const char *cmd = argv[0] ? argv[0] : "git-help"; | |
390 | char *slash = strrchr(cmd, '/'); | |
391 | const char *cmd_path = NULL; | |
392 | int done_alias = 0; | |
393 | ||
394 | /* | |
395 | * Take the basename of argv[0] as the command | |
396 | * name, and the dirname as the default exec_path | |
397 | * if we don't have anything better. | |
398 | */ | |
399 | if (slash) { | |
400 | *slash++ = 0; | |
401 | cmd_path = cmd; | |
402 | cmd = slash; | |
403 | } | |
404 | ||
405 | /* | |
406 | * "git-xxxx" is the same as "git xxxx", but we obviously: | |
407 | * | |
408 | * - cannot take flags in between the "git" and the "xxxx". | |
409 | * - cannot execute it externally (since it would just do | |
410 | * the same thing over again) | |
411 | * | |
412 | * So we just directly call the internal command handler, and | |
413 | * die if that one cannot handle it. | |
414 | */ | |
415 | if (!prefixcmp(cmd, "git-")) { | |
416 | cmd += 4; | |
417 | argv[0] = cmd; | |
418 | handle_internal_command(argc, argv); | |
419 | die("cannot handle %s internally", cmd); | |
420 | } | |
421 | ||
422 | /* Look for flags.. */ | |
423 | argv++; | |
424 | argc--; | |
425 | handle_options(&argv, &argc, NULL); | |
426 | if (argc > 0) { | |
427 | if (!prefixcmp(argv[0], "--")) | |
428 | argv[0] += 2; | |
429 | } else { | |
430 | /* The user didn't specify a command; give them help */ | |
431 | printf("usage: %s\n\n", git_usage_string); | |
432 | list_common_cmds_help(); | |
433 | exit(1); | |
434 | } | |
435 | cmd = argv[0]; | |
436 | ||
437 | /* | |
438 | * We use PATH to find git commands, but we prepend some higher | |
439 | * precidence paths: the "--exec-path" option, the GIT_EXEC_PATH | |
440 | * environment, and the $(gitexecdir) from the Makefile at build | |
441 | * time. | |
442 | */ | |
443 | setup_path(cmd_path); | |
444 | ||
445 | while (1) { | |
446 | /* See if it's an internal command */ | |
447 | handle_internal_command(argc, argv); | |
448 | ||
449 | /* .. then try the external ones */ | |
450 | execv_git_cmd(argv); | |
451 | ||
452 | /* It could be an alias -- this works around the insanity | |
453 | * of overriding "git log" with "git show" by having | |
454 | * alias.log = show | |
455 | */ | |
456 | if (done_alias || !handle_alias(&argc, &argv)) | |
457 | break; | |
458 | done_alias = 1; | |
459 | } | |
460 | ||
461 | if (errno == ENOENT) { | |
462 | if (done_alias) { | |
463 | fprintf(stderr, "Expansion of alias '%s' failed; " | |
464 | "'%s' is not a git-command\n", | |
465 | cmd, argv[0]); | |
466 | exit(1); | |
467 | } | |
468 | help_unknown_cmd(cmd); | |
469 | } | |
470 | ||
471 | fprintf(stderr, "Failed to run command '%s': %s\n", | |
472 | cmd, strerror(errno)); | |
473 | ||
474 | return 1; | |
475 | } |