Record the command invocation path early
[git/git.git] / git.c
CommitLineData
85023577 1#include "builtin.h"
77cb17e9 2#include "exec_cmd.h"
2b11e317 3#include "cache.h"
575ba9d6 4#include "quote.h"
8e49d503 5
822a7d50 6const char git_usage_string[] =
463a849d 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]";
822a7d50 8
b7d96819
TL
9const char git_more_info_string[] =
10 "See 'git help COMMAND' for more information on a specific command.";
11
4e10738a
JK
12static int use_pager = -1;
13struct pager_config {
14 const char *cmd;
15 int val;
16};
17
18static 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" */
27int 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
36static 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
4394efec 49static int handle_options(const char*** argv, int* argc, int* envchanged)
4ab243a9
JS
50{
51 int handled = 0;
52
53 while (*argc > 0) {
54 const char *cmd = (*argv)[0];
55 if (cmd[0] != '-')
56 break;
57
6acbcb92
JS
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 */
cc44c765 69 if (!prefixcmp(cmd, "--exec-path")) {
6acbcb92
JS
70 cmd += 11;
71 if (*cmd == '=')
384df833 72 git_set_argv_exec_path(cmd + 1);
6acbcb92
JS
73 else {
74 puts(git_exec_path());
75 exit(0);
76 }
77 } else if (!strcmp(cmd, "-p") || !strcmp(cmd, "--paginate")) {
4e10738a 78 use_pager = 1;
463a849d 79 } else if (!strcmp(cmd, "--no-pager")) {
4e10738a 80 use_pager = 0;
463a849d
MM
81 if (envchanged)
82 *envchanged = 1;
6acbcb92 83 } else if (!strcmp(cmd, "--git-dir")) {
c321f00d
BG
84 if (*argc < 2) {
85 fprintf(stderr, "No directory given for --git-dir.\n" );
86 usage(git_usage_string);
87 }
45b09794 88 setenv(GIT_DIR_ENVIRONMENT, (*argv)[1], 1);
4394efec
ML
89 if (envchanged)
90 *envchanged = 1;
6acbcb92
JS
91 (*argv)++;
92 (*argc)--;
e4b02333 93 handled++;
cc44c765 94 } else if (!prefixcmp(cmd, "--git-dir=")) {
45b09794 95 setenv(GIT_DIR_ENVIRONMENT, cmd + 10, 1);
4394efec
ML
96 if (envchanged)
97 *envchanged = 1;
892c41b9
ML
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);
4394efec
ML
104 if (envchanged)
105 *envchanged = 1;
892c41b9
ML
106 (*argv)++;
107 (*argc)--;
108 } else if (!prefixcmp(cmd, "--work-tree=")) {
109 setenv(GIT_WORK_TREE_ENVIRONMENT, cmd + 12, 1);
4394efec
ML
110 if (envchanged)
111 *envchanged = 1;
6acbcb92 112 } else if (!strcmp(cmd, "--bare")) {
ef5ddb2f 113 static char git_dir[PATH_MAX+1];
6adcca3f 114 is_bare_repository_cfg = 1;
9277d602 115 setenv(GIT_DIR_ENVIRONMENT, getcwd(git_dir, sizeof(git_dir)), 0);
4394efec
ML
116 if (envchanged)
117 *envchanged = 1;
6acbcb92
JS
118 } else {
119 fprintf(stderr, "Unknown option: %s\n", cmd);
822a7d50 120 usage(git_usage_string);
6acbcb92 121 }
4ab243a9
JS
122
123 (*argv)++;
124 (*argc)--;
125 handled++;
126 }
127 return handled;
128}
129
2b11e317
JS
130static int handle_alias(int *argcp, const char ***argv)
131{
af05d679 132 int envchanged = 0, ret = 0, saved_errno = errno;
2b11e317 133 const char *subdir;
0347a8c7
ML
134 int count, option_count;
135 const char** new_argv;
94351118
JK
136 const char *alias_command;
137 char *alias_string;
e85dc0a3 138 int unused_nongit;
2b11e317 139
e85dc0a3 140 subdir = setup_git_directory_gently(&unused_nongit);
0347a8c7
ML
141
142 alias_command = (*argv)[0];
94351118 143 alias_string = alias_lookup(alias_command);
0347a8c7 144 if (alias_string) {
dfd42a3c 145 if (alias_string[0] == '!') {
a2f8028d 146 if (*argcp > 1) {
7a33bcbe 147 struct strbuf buf;
a2f8028d 148
7a33bcbe
PH
149 strbuf_init(&buf, PATH_MAX);
150 strbuf_addstr(&buf, alias_string);
b319ce4c 151 sq_quote_argv(&buf, (*argv) + 1, PATH_MAX);
a2f8028d 152 free(alias_string);
7a33bcbe 153 alias_string = buf.buf;
a2f8028d 154 }
dfd42a3c
TT
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 }
0347a8c7 164 count = split_cmdline(alias_string, &new_argv);
4394efec
ML
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);
0347a8c7
ML
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
b319ce4c 180 trace_argv_printf(new_argv,
6ce4e61f
CC
181 "trace: alias expansion: %s =>",
182 alias_command);
575ba9d6 183
83572c1a
JF
184 new_argv = xrealloc(new_argv, sizeof(char*) *
185 (count + *argcp + 1));
0347a8c7
ML
186 /* insert after command name */
187 memcpy(new_argv + count, *argv + 1, sizeof(char*) * *argcp);
188 new_argv[count+*argcp] = NULL;
2b11e317 189
0347a8c7
ML
190 *argv = new_argv;
191 *argcp += count - 1;
2b11e317 192
0347a8c7 193 ret = 1;
2b11e317
JS
194 }
195
196 if (subdir)
197 chdir(subdir);
198
47e5c0ca
JS
199 errno = saved_errno;
200
2b11e317
JS
201 return ret;
202}
203
70827b15 204const char git_version_string[] = GIT_VERSION;
5b84f4d8 205
efffea03
JH
206#define RUN_SETUP (1<<0)
207#define USE_PAGER (1<<1)
7eff28a9
SP
208/*
209 * require working tree to be present -- anything uses this needs
210 * RUN_SETUP for reading from the configuration file.
211 */
7ae3df8c 212#define NEED_WORK_TREE (1<<2)
a633fca0 213
47d0b4ff
LT
214struct cmd_struct {
215 const char *cmd;
216 int (*fn)(int, const char **, const char *);
217 int option;
218};
219
220static int run_command(struct cmd_struct *p, int argc, const char **argv)
221{
0f157315
LT
222 int status;
223 struct stat st;
47d0b4ff
LT
224 const char *prefix;
225
226 prefix = NULL;
227 if (p->option & RUN_SETUP)
228 prefix = setup_git_directory();
4e10738a
JK
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
59f0f2f3
MH
236 if (p->option & NEED_WORK_TREE)
237 setup_work_tree();
238
b319ce4c 239 trace_argv_printf(argv, "trace: built-in: git");
47d0b4ff 240
0f157315
LT
241 status = p->fn(argc, argv, prefix);
242 if (status)
2488df84 243 return status & 0xff;
0f157315
LT
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.. */
0227f988 253 if (fflush(stdout))
0f157315 254 die("write failure on standard output: %s", strerror(errno));
0227f988
LT
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));
0f157315 259 return 0;
47d0b4ff
LT
260}
261
262static void handle_internal_command(int argc, const char **argv)
231af832
LT
263{
264 const char *cmd = argv[0];
47d0b4ff 265 static struct cmd_struct commands[] = {
7ae3df8c 266 { "add", cmd_add, RUN_SETUP | NEED_WORK_TREE },
d97bc5de 267 { "annotate", cmd_annotate, RUN_SETUP },
f754fa9c 268 { "apply", cmd_apply },
265d5280 269 { "archive", cmd_archive },
4f0219a4 270 { "blame", cmd_blame, RUN_SETUP },
1da1b3a3 271 { "branch", cmd_branch, RUN_SETUP },
2e0afafe 272 { "bundle", cmd_bundle },
efffea03 273 { "cat-file", cmd_cat_file, RUN_SETUP },
782c2d65 274 { "checkout", cmd_checkout, RUN_SETUP | NEED_WORK_TREE },
4465f410
JS
275 { "checkout-index", cmd_checkout_index,
276 RUN_SETUP | NEED_WORK_TREE},
0864f264 277 { "check-ref-format", cmd_check_ref_format },
2d35d556 278 { "check-attr", cmd_check_attr, RUN_SETUP },
e827633a 279 { "cherry", cmd_cherry, RUN_SETUP },
7ae3df8c 280 { "cherry-pick", cmd_cherry_pick, RUN_SETUP | NEED_WORK_TREE },
8434c2f1 281 { "clone", cmd_clone },
113f10f2 282 { "clean", cmd_clean, RUN_SETUP | NEED_WORK_TREE },
f5bbc322 283 { "commit", cmd_commit, RUN_SETUP | NEED_WORK_TREE },
efffea03 284 { "commit-tree", cmd_commit_tree, RUN_SETUP },
e0d10e1c 285 { "config", cmd_config },
8112894d 286 { "count-objects", cmd_count_objects, RUN_SETUP },
9a0eaf83 287 { "describe", cmd_describe, RUN_SETUP },
89d07f75 288 { "diff", cmd_diff },
6304c29d 289 { "diff-files", cmd_diff_files, RUN_SETUP },
efffea03 290 { "diff-index", cmd_diff_index, RUN_SETUP },
efffea03 291 { "diff-tree", cmd_diff_tree, RUN_SETUP },
f2dc849e 292 { "fast-export", cmd_fast_export, RUN_SETUP },
b888d61c 293 { "fetch", cmd_fetch, RUN_SETUP },
2d4177c0 294 { "fetch-pack", cmd_fetch_pack, RUN_SETUP },
d4289fff 295 { "fetch--tool", cmd_fetch__tool, RUN_SETUP },
efffea03 296 { "fmt-merge-msg", cmd_fmt_merge_msg, RUN_SETUP },
9f613ddd 297 { "for-each-ref", cmd_for_each_ref, RUN_SETUP },
efffea03 298 { "format-patch", cmd_format_patch, RUN_SETUP },
b4dfefe0
MW
299 { "fsck", cmd_fsck, RUN_SETUP },
300 { "fsck-objects", cmd_fsck, RUN_SETUP },
6757ada4 301 { "gc", cmd_gc, RUN_SETUP },
f754fa9c 302 { "get-tar-commit-id", cmd_get_tar_commit_id },
34c6a82b 303 { "grep", cmd_grep, RUN_SETUP | USE_PAGER },
f754fa9c 304 { "help", cmd_help },
30ae764b
DB
305#ifndef NO_CURL
306 { "http-fetch", cmd_http_fetch, RUN_SETUP },
307#endif
515377ea 308 { "init", cmd_init_db },
f754fa9c 309 { "init-db", cmd_init_db },
efffea03
JH
310 { "log", cmd_log, RUN_SETUP | USE_PAGER },
311 { "ls-files", cmd_ls_files, RUN_SETUP },
312 { "ls-tree", cmd_ls_tree, RUN_SETUP },
8951d7c1 313 { "ls-remote", cmd_ls_remote },
f754fa9c
JH
314 { "mailinfo", cmd_mailinfo },
315 { "mailsplit", cmd_mailsplit },
1c7b76be 316 { "merge", cmd_merge, RUN_SETUP | NEED_WORK_TREE },
71dfbf22 317 { "merge-base", cmd_merge_base, RUN_SETUP },
ba1f5f35 318 { "merge-file", cmd_merge_file },
a00a42ae 319 { "merge-ours", cmd_merge_ours, RUN_SETUP },
e1b3a2ca 320 { "merge-recursive", cmd_merge_recursive, RUN_SETUP | NEED_WORK_TREE },
1736855c 321 { "merge-subtree", cmd_merge_recursive, RUN_SETUP | NEED_WORK_TREE },
7ae3df8c 322 { "mv", cmd_mv, RUN_SETUP | NEED_WORK_TREE },
efffea03
JH
323 { "name-rev", cmd_name_rev, RUN_SETUP },
324 { "pack-objects", cmd_pack_objects, RUN_SETUP },
8951d7c1 325 { "peek-remote", cmd_ls_remote },
d97bc5de 326 { "pickaxe", cmd_blame, RUN_SETUP },
efffea03
JH
327 { "prune", cmd_prune, RUN_SETUP },
328 { "prune-packed", cmd_prune_packed, RUN_SETUP },
102cb085 329 { "push", cmd_push, RUN_SETUP },
efffea03 330 { "read-tree", cmd_read_tree, RUN_SETUP },
4264dc15 331 { "reflog", cmd_reflog, RUN_SETUP },
211c8968 332 { "remote", cmd_remote, RUN_SETUP },
e0d10e1c 333 { "repo-config", cmd_config },
658f3650 334 { "rerere", cmd_rerere, RUN_SETUP },
0e5a7faa 335 { "reset", cmd_reset, RUN_SETUP },
efffea03 336 { "rev-list", cmd_rev_list, RUN_SETUP },
5410a02a 337 { "rev-parse", cmd_rev_parse },
7ae3df8c 338 { "revert", cmd_revert, RUN_SETUP | NEED_WORK_TREE },
271bb087 339 { "rm", cmd_rm, RUN_SETUP },
96249c04 340 { "send-pack", cmd_send_pack, RUN_SETUP },
abe549e1 341 { "shortlog", cmd_shortlog, USE_PAGER },
efffea03
JH
342 { "show-branch", cmd_show_branch, RUN_SETUP },
343 { "show", cmd_show, RUN_SETUP | USE_PAGER },
10762323 344 { "status", cmd_status, RUN_SETUP | NEED_WORK_TREE },
f754fa9c 345 { "stripspace", cmd_stripspace },
efffea03 346 { "symbolic-ref", cmd_symbolic_ref, RUN_SETUP },
62e09ce9 347 { "tag", cmd_tag, RUN_SETUP },
9cb90b80 348 { "tar-tree", cmd_tar_tree },
efffea03
JH
349 { "unpack-objects", cmd_unpack_objects, RUN_SETUP },
350 { "update-index", cmd_update_index, RUN_SETUP },
351 { "update-ref", cmd_update_ref, RUN_SETUP },
39345a21 352 { "upload-archive", cmd_upload_archive },
2ae68fcb 353 { "verify-tag", cmd_verify_tag, RUN_SETUP },
f754fa9c 354 { "version", cmd_version },
efffea03
JH
355 { "whatchanged", cmd_whatchanged, RUN_SETUP | USE_PAGER },
356 { "write-tree", cmd_write_tree, RUN_SETUP },
2e3ed670 357 { "verify-pack", cmd_verify_pack },
358ddb62 358 { "show-ref", cmd_show_ref, RUN_SETUP },
e1e22e37 359 { "pack-refs", cmd_pack_refs, RUN_SETUP },
231af832
LT
360 };
361 int i;
23326d14
JS
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 }
231af832 372
1cd95087
LT
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
231af832
LT
379 for (i = 0; i < ARRAY_SIZE(commands); i++) {
380 struct cmd_struct *p = commands+i;
381 if (strcmp(p->cmd, cmd))
382 continue;
47d0b4ff 383 exit(run_command(p, argc, argv));
231af832
LT
384 }
385}
386
7550be0a
JH
387static 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
47d0b4ff 417int main(int argc, const char **argv)
8e49d503 418{
23326d14
JS
419 const char *cmd = argv[0] && *argv[0] ? argv[0] : "git-help";
420 char *slash = (char *)cmd + strlen(cmd);
a025463b 421 int done_alias = 0;
231af832
LT
422
423 /*
424 * Take the basename of argv[0] as the command
425 * name, and the dirname as the default exec_path
43db492a 426 * if we don't have anything better.
231af832 427 */
23326d14
JS
428 do
429 --slash;
430 while (cmd <= slash && !is_dir_sep(*slash));
431 if (cmd <= slash) {
231af832 432 *slash++ = 0;
e1464ca7 433 git_set_argv0_path(cmd);
231af832
LT
434 cmd = slash;
435 }
8e49d503 436
231af832
LT
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 */
cc44c765 447 if (!prefixcmp(cmd, "git-")) {
231af832
LT
448 cmd += 4;
449 argv[0] = cmd;
47d0b4ff 450 handle_internal_command(argc, argv);
231af832
LT
451 die("cannot handle %s internally", cmd);
452 }
8e49d503 453
231af832 454 /* Look for flags.. */
6acbcb92
JS
455 argv++;
456 argc--;
4394efec 457 handle_options(&argv, &argc, NULL);
4e10738a 458 commit_pager_choice();
6acbcb92 459 if (argc > 0) {
cc44c765 460 if (!prefixcmp(argv[0], "--"))
6acbcb92
JS
461 argv[0] += 2;
462 } else {
3d7e2d85
SP
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();
b7d96819 466 printf("\n%s\n", git_more_info_string);
3d7e2d85 467 exit(1);
97fc6c5f 468 }
6acbcb92 469 cmd = argv[0];
231af832
LT
470
471 /*
511707d4
SP
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.
231af832 476 */
e1464ca7 477 setup_path();
8e49d503 478
a025463b
JH
479 while (1) {
480 /* See if it's an internal command */
47d0b4ff 481 handle_internal_command(argc, argv);
2b11e317 482
a025463b 483 /* .. then try the external ones */
7550be0a 484 execv_dashed_external(argv);
231af832 485
a025463b
JH
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 }
10b15b86 494
f3dd015c
TT
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 }
822a7d50 502 help_unknown_cmd(cmd);
f3dd015c 503 }
10b15b86
AR
504
505 fprintf(stderr, "Failed to run command '%s': %s\n",
33ebb871 506 cmd, strerror(errno));
8e49d503
AE
507
508 return 1;
509}