dashed externals: kill children on exit
[git/git.git] / git.c
CommitLineData
85023577 1#include "builtin.h"
2b11e317 2#include "cache.h"
fd5c363d
TF
3#include "exec_cmd.h"
4#include "help.h"
575ba9d6 5#include "quote.h"
d8e96fd8 6#include "run-command.h"
8e49d503 7
822a7d50 8const char git_usage_string[] =
f2dd8c37 9 "git [--version] [--exec-path[=<path>]] [--html-path] [--man-path] [--info-path]\n"
a1bea2c1
JT
10 " [-p|--paginate|--no-pager] [--no-replace-objects] [--bare]\n"
11 " [--git-dir=<path>] [--work-tree=<path>] [--namespace=<name>]\n"
293b07f1 12 " [-c name=value] [--help]\n"
62b4698e 13 " <command> [<args>]";
822a7d50 14
b7d96819 15const char git_more_info_string[] =
62b4698e 16 "See 'git help <command>' for more information on a specific command.";
b7d96819 17
e37c1329 18static struct startup_info git_startup_info;
4e10738a
JK
19static int use_pager = -1;
20struct pager_config {
21 const char *cmd;
9bad7233
JK
22 int want;
23 char *value;
4e10738a
JK
24};
25
26static int pager_command_config(const char *var, const char *value, void *data)
27{
28 struct pager_config *c = data;
9bad7233
JK
29 if (!prefixcmp(var, "pager.") && !strcmp(var + 6, c->cmd)) {
30 int b = git_config_maybe_bool(var, value);
31 if (b >= 0)
32 c->want = b;
33 else {
34 c->want = 1;
35 c->value = xstrdup(value);
36 }
37 }
4e10738a
JK
38 return 0;
39}
40
41/* returns 0 for "no pager", 1 for "use pager", and -1 for "not specified" */
42int check_pager_config(const char *cmd)
43{
44 struct pager_config c;
45 c.cmd = cmd;
9bad7233
JK
46 c.want = -1;
47 c.value = NULL;
4e10738a 48 git_config(pager_command_config, &c);
9bad7233
JK
49 if (c.value)
50 pager_program = c.value;
51 return c.want;
4e10738a
JK
52}
53
54static void commit_pager_choice(void) {
55 switch (use_pager) {
56 case 0:
57 setenv("GIT_PAGER", "cat", 1);
58 break;
59 case 1:
60 setup_pager();
61 break;
62 default:
63 break;
64 }
65}
66
4b25d091 67static int handle_options(const char ***argv, int *argc, int *envchanged)
4ab243a9 68{
73546c08 69 const char **orig_argv = *argv;
4ab243a9
JS
70
71 while (*argc > 0) {
72 const char *cmd = (*argv)[0];
73 if (cmd[0] != '-')
74 break;
75
6acbcb92
JS
76 /*
77 * For legacy reasons, the "version" and "help"
78 * commands can be written with "--" prepended
79 * to make them look like flags.
80 */
81 if (!strcmp(cmd, "--help") || !strcmp(cmd, "--version"))
82 break;
83
84 /*
85 * Check remaining flags.
86 */
cc44c765 87 if (!prefixcmp(cmd, "--exec-path")) {
6acbcb92
JS
88 cmd += 11;
89 if (*cmd == '=')
384df833 90 git_set_argv_exec_path(cmd + 1);
6acbcb92
JS
91 else {
92 puts(git_exec_path());
93 exit(0);
94 }
89a56bfb
MH
95 } else if (!strcmp(cmd, "--html-path")) {
96 puts(system_path(GIT_HTML_PATH));
97 exit(0);
f2dd8c37
JS
98 } else if (!strcmp(cmd, "--man-path")) {
99 puts(system_path(GIT_MAN_PATH));
100 exit(0);
101 } else if (!strcmp(cmd, "--info-path")) {
102 puts(system_path(GIT_INFO_PATH));
103 exit(0);
6acbcb92 104 } else if (!strcmp(cmd, "-p") || !strcmp(cmd, "--paginate")) {
4e10738a 105 use_pager = 1;
463a849d 106 } else if (!strcmp(cmd, "--no-pager")) {
4e10738a 107 use_pager = 0;
463a849d
MM
108 if (envchanged)
109 *envchanged = 1;
b0fa7ab5
CC
110 } else if (!strcmp(cmd, "--no-replace-objects")) {
111 read_replace_refs = 0;
6476b38b
CC
112 setenv(NO_REPLACE_OBJECTS_ENVIRONMENT, "1", 1);
113 if (envchanged)
114 *envchanged = 1;
6acbcb92 115 } else if (!strcmp(cmd, "--git-dir")) {
c321f00d
BG
116 if (*argc < 2) {
117 fprintf(stderr, "No directory given for --git-dir.\n" );
118 usage(git_usage_string);
119 }
45b09794 120 setenv(GIT_DIR_ENVIRONMENT, (*argv)[1], 1);
4394efec
ML
121 if (envchanged)
122 *envchanged = 1;
6acbcb92
JS
123 (*argv)++;
124 (*argc)--;
cc44c765 125 } else if (!prefixcmp(cmd, "--git-dir=")) {
45b09794 126 setenv(GIT_DIR_ENVIRONMENT, cmd + 10, 1);
4394efec
ML
127 if (envchanged)
128 *envchanged = 1;
a1bea2c1
JT
129 } else if (!strcmp(cmd, "--namespace")) {
130 if (*argc < 2) {
131 fprintf(stderr, "No namespace given for --namespace.\n" );
132 usage(git_usage_string);
133 }
134 setenv(GIT_NAMESPACE_ENVIRONMENT, (*argv)[1], 1);
135 if (envchanged)
136 *envchanged = 1;
137 (*argv)++;
138 (*argc)--;
139 } else if (!prefixcmp(cmd, "--namespace=")) {
140 setenv(GIT_NAMESPACE_ENVIRONMENT, cmd + 12, 1);
141 if (envchanged)
142 *envchanged = 1;
892c41b9
ML
143 } else if (!strcmp(cmd, "--work-tree")) {
144 if (*argc < 2) {
145 fprintf(stderr, "No directory given for --work-tree.\n" );
146 usage(git_usage_string);
147 }
148 setenv(GIT_WORK_TREE_ENVIRONMENT, (*argv)[1], 1);
4394efec
ML
149 if (envchanged)
150 *envchanged = 1;
892c41b9
ML
151 (*argv)++;
152 (*argc)--;
153 } else if (!prefixcmp(cmd, "--work-tree=")) {
154 setenv(GIT_WORK_TREE_ENVIRONMENT, cmd + 12, 1);
4394efec
ML
155 if (envchanged)
156 *envchanged = 1;
6acbcb92 157 } else if (!strcmp(cmd, "--bare")) {
ef5ddb2f 158 static char git_dir[PATH_MAX+1];
6adcca3f 159 is_bare_repository_cfg = 1;
9277d602 160 setenv(GIT_DIR_ENVIRONMENT, getcwd(git_dir, sizeof(git_dir)), 0);
4394efec
ML
161 if (envchanged)
162 *envchanged = 1;
8b1fa778
AR
163 } else if (!strcmp(cmd, "-c")) {
164 if (*argc < 2) {
165 fprintf(stderr, "-c expects a configuration string\n" );
166 usage(git_usage_string);
167 }
2b64fc89 168 git_config_push_parameter((*argv)[1]);
8b1fa778
AR
169 (*argv)++;
170 (*argc)--;
6acbcb92
JS
171 } else {
172 fprintf(stderr, "Unknown option: %s\n", cmd);
822a7d50 173 usage(git_usage_string);
6acbcb92 174 }
4ab243a9
JS
175
176 (*argv)++;
177 (*argc)--;
4ab243a9 178 }
73546c08 179 return (*argv) - orig_argv;
4ab243a9
JS
180}
181
2b11e317
JS
182static int handle_alias(int *argcp, const char ***argv)
183{
af05d679 184 int envchanged = 0, ret = 0, saved_errno = errno;
2b11e317 185 const char *subdir;
0347a8c7 186 int count, option_count;
4b25d091 187 const char **new_argv;
94351118
JK
188 const char *alias_command;
189 char *alias_string;
e85dc0a3 190 int unused_nongit;
2b11e317 191
e85dc0a3 192 subdir = setup_git_directory_gently(&unused_nongit);
0347a8c7
ML
193
194 alias_command = (*argv)[0];
94351118 195 alias_string = alias_lookup(alias_command);
0347a8c7 196 if (alias_string) {
dfd42a3c 197 if (alias_string[0] == '!') {
7f51f8bc
EFL
198 const char **alias_argv;
199 int argc = *argcp, i;
200
030149a4 201 commit_pager_choice();
7f51f8bc
EFL
202
203 /* build alias_argv */
204 alias_argv = xmalloc(sizeof(*alias_argv) * (argc + 1));
205 alias_argv[0] = alias_string + 1;
206 for (i = 1; i < argc; ++i)
207 alias_argv[i] = (*argv)[i];
208 alias_argv[argc] = NULL;
209
26b05251 210 ret = run_command_v_opt(alias_argv, RUN_USING_SHELL);
7f51f8bc
EFL
211 if (ret >= 0) /* normal exit */
212 exit(ret);
213
214 die_errno("While expanding alias '%s': '%s'",
215 alias_command, alias_string + 1);
dfd42a3c 216 }
0347a8c7 217 count = split_cmdline(alias_string, &new_argv);
dc4179f9 218 if (count < 0)
ad9ac6db
GB
219 die("Bad alias.%s string: %s", alias_command,
220 split_cmdline_strerror(count));
4394efec
ML
221 option_count = handle_options(&new_argv, &count, &envchanged);
222 if (envchanged)
223 die("alias '%s' changes environment variables\n"
224 "You can use '!git' in the alias to do this.",
225 alias_command);
0347a8c7
ML
226 memmove(new_argv - option_count, new_argv,
227 count * sizeof(char *));
228 new_argv -= option_count;
229
230 if (count < 1)
231 die("empty alias for %s", alias_command);
232
233 if (!strcmp(alias_command, new_argv[0]))
234 die("recursive alias: %s", alias_command);
235
b319ce4c 236 trace_argv_printf(new_argv,
6ce4e61f
CC
237 "trace: alias expansion: %s =>",
238 alias_command);
575ba9d6 239
4b25d091 240 new_argv = xrealloc(new_argv, sizeof(char *) *
6167c136 241 (count + *argcp));
0347a8c7 242 /* insert after command name */
4b25d091 243 memcpy(new_argv + count, *argv + 1, sizeof(char *) * *argcp);
2b11e317 244
0347a8c7
ML
245 *argv = new_argv;
246 *argcp += count - 1;
2b11e317 247
0347a8c7 248 ret = 1;
2b11e317
JS
249 }
250
7be77de2 251 if (subdir && chdir(subdir))
d824cbba 252 die_errno("Cannot change to '%s'", subdir);
2b11e317 253
47e5c0ca
JS
254 errno = saved_errno;
255
2b11e317
JS
256 return ret;
257}
258
70827b15 259const char git_version_string[] = GIT_VERSION;
5b84f4d8 260
ee38dfb8
NTND
261#define RUN_SETUP (1<<0)
262#define RUN_SETUP_GENTLY (1<<1)
263#define USE_PAGER (1<<2)
7eff28a9
SP
264/*
265 * require working tree to be present -- anything uses this needs
266 * RUN_SETUP for reading from the configuration file.
267 */
ee38dfb8 268#define NEED_WORK_TREE (1<<3)
a633fca0 269
47d0b4ff
LT
270struct cmd_struct {
271 const char *cmd;
272 int (*fn)(int, const char **, const char *);
273 int option;
274};
275
f172f334 276static int run_builtin(struct cmd_struct *p, int argc, const char **argv)
47d0b4ff 277{
99caeed0 278 int status, help;
0f157315 279 struct stat st;
47d0b4ff
LT
280 const char *prefix;
281
282 prefix = NULL;
99caeed0
JN
283 help = argc == 2 && !strcmp(argv[1], "-h");
284 if (!help) {
285 if (p->option & RUN_SETUP)
286 prefix = setup_git_directory();
ee38dfb8
NTND
287 if (p->option & RUN_SETUP_GENTLY) {
288 int nongit_ok;
289 prefix = setup_git_directory_gently(&nongit_ok);
290 }
99caeed0 291
ee38dfb8 292 if (use_pager == -1 && p->option & (RUN_SETUP | RUN_SETUP_GENTLY))
99caeed0
JN
293 use_pager = check_pager_config(p->cmd);
294 if (use_pager == -1 && p->option & USE_PAGER)
295 use_pager = 1;
a9ca8a85
NTND
296
297 if ((p->option & (RUN_SETUP | RUN_SETUP_GENTLY)) &&
298 startup_info->have_repository) /* get_git_dir() may set up repo, avoid that */
299 trace_repo_setup(prefix);
99caeed0 300 }
4e10738a
JK
301 commit_pager_choice();
302
99caeed0 303 if (!help && p->option & NEED_WORK_TREE)
59f0f2f3
MH
304 setup_work_tree();
305
b319ce4c 306 trace_argv_printf(argv, "trace: built-in: git");
47d0b4ff 307
0f157315
LT
308 status = p->fn(argc, argv, prefix);
309 if (status)
47e3de0e 310 return status;
0f157315
LT
311
312 /* Somebody closed stdout? */
313 if (fstat(fileno(stdout), &st))
314 return 0;
315 /* Ignore write errors for pipes and sockets.. */
316 if (S_ISFIFO(st.st_mode) || S_ISSOCK(st.st_mode))
317 return 0;
318
319 /* Check for ENOSPC and EIO errors.. */
0227f988 320 if (fflush(stdout))
d824cbba 321 die_errno("write failure on standard output");
0227f988
LT
322 if (ferror(stdout))
323 die("unknown write failure on standard output");
324 if (fclose(stdout))
d824cbba 325 die_errno("close failed on standard output");
0f157315 326 return 0;
47d0b4ff
LT
327}
328
329static void handle_internal_command(int argc, const char **argv)
231af832
LT
330{
331 const char *cmd = argv[0];
47d0b4ff 332 static struct cmd_struct commands[] = {
7ae3df8c 333 { "add", cmd_add, RUN_SETUP | NEED_WORK_TREE },
d97bc5de 334 { "annotate", cmd_annotate, RUN_SETUP },
d1ea8962 335 { "apply", cmd_apply, RUN_SETUP_GENTLY },
265d5280 336 { "archive", cmd_archive },
24c51280 337 { "bisect--helper", cmd_bisect__helper, RUN_SETUP },
4f0219a4 338 { "blame", cmd_blame, RUN_SETUP },
1da1b3a3 339 { "branch", cmd_branch, RUN_SETUP },
2cb60093 340 { "bundle", cmd_bundle, RUN_SETUP_GENTLY },
efffea03 341 { "cat-file", cmd_cat_file, RUN_SETUP },
ef5dd8a9
NTND
342 { "check-attr", cmd_check_attr, RUN_SETUP },
343 { "check-ref-format", cmd_check_ref_format },
782c2d65 344 { "checkout", cmd_checkout, RUN_SETUP | NEED_WORK_TREE },
4465f410
JS
345 { "checkout-index", cmd_checkout_index,
346 RUN_SETUP | NEED_WORK_TREE},
e827633a 347 { "cherry", cmd_cherry, RUN_SETUP },
7ae3df8c 348 { "cherry-pick", cmd_cherry_pick, RUN_SETUP | NEED_WORK_TREE },
113f10f2 349 { "clean", cmd_clean, RUN_SETUP | NEED_WORK_TREE },
ef5dd8a9 350 { "clone", cmd_clone },
f5bbc322 351 { "commit", cmd_commit, RUN_SETUP | NEED_WORK_TREE },
efffea03 352 { "commit-tree", cmd_commit_tree, RUN_SETUP },
3ba7e6e2 353 { "config", cmd_config, RUN_SETUP_GENTLY },
8112894d 354 { "count-objects", cmd_count_objects, RUN_SETUP },
9a0eaf83 355 { "describe", cmd_describe, RUN_SETUP },
89d07f75 356 { "diff", cmd_diff },
4f38f6b5 357 { "diff-files", cmd_diff_files, RUN_SETUP | NEED_WORK_TREE },
efffea03 358 { "diff-index", cmd_diff_index, RUN_SETUP },
efffea03 359 { "diff-tree", cmd_diff_tree, RUN_SETUP },
f2dc849e 360 { "fast-export", cmd_fast_export, RUN_SETUP },
b888d61c 361 { "fetch", cmd_fetch, RUN_SETUP },
2d4177c0 362 { "fetch-pack", cmd_fetch_pack, RUN_SETUP },
efffea03 363 { "fmt-merge-msg", cmd_fmt_merge_msg, RUN_SETUP },
9f613ddd 364 { "for-each-ref", cmd_for_each_ref, RUN_SETUP },
efffea03 365 { "format-patch", cmd_format_patch, RUN_SETUP },
b4dfefe0
MW
366 { "fsck", cmd_fsck, RUN_SETUP },
367 { "fsck-objects", cmd_fsck, RUN_SETUP },
6757ada4 368 { "gc", cmd_gc, RUN_SETUP },
f754fa9c 369 { "get-tar-commit-id", cmd_get_tar_commit_id },
ff38d1a9 370 { "grep", cmd_grep, RUN_SETUP_GENTLY },
b28a1ce0 371 { "hash-object", cmd_hash_object },
f754fa9c 372 { "help", cmd_help },
e0fce074 373 { "index-pack", cmd_index_pack, RUN_SETUP_GENTLY },
515377ea 374 { "init", cmd_init_db },
f754fa9c 375 { "init-db", cmd_init_db },
1fda91b5 376 { "log", cmd_log, RUN_SETUP },
efffea03 377 { "ls-files", cmd_ls_files, RUN_SETUP },
f0ef6a6e 378 { "ls-remote", cmd_ls_remote, RUN_SETUP_GENTLY },
ef5dd8a9 379 { "ls-tree", cmd_ls_tree, RUN_SETUP },
f754fa9c
JH
380 { "mailinfo", cmd_mailinfo },
381 { "mailsplit", cmd_mailsplit },
1c7b76be 382 { "merge", cmd_merge, RUN_SETUP | NEED_WORK_TREE },
71dfbf22 383 { "merge-base", cmd_merge_base, RUN_SETUP },
3668d423 384 { "merge-file", cmd_merge_file, RUN_SETUP_GENTLY },
0ecace72 385 { "merge-index", cmd_merge_index, RUN_SETUP },
a00a42ae 386 { "merge-ours", cmd_merge_ours, RUN_SETUP },
e1b3a2ca 387 { "merge-recursive", cmd_merge_recursive, RUN_SETUP | NEED_WORK_TREE },
8cc5b290
AP
388 { "merge-recursive-ours", cmd_merge_recursive, RUN_SETUP | NEED_WORK_TREE },
389 { "merge-recursive-theirs", cmd_merge_recursive, RUN_SETUP | NEED_WORK_TREE },
1736855c 390 { "merge-subtree", cmd_merge_recursive, RUN_SETUP | NEED_WORK_TREE },
907a7cb5 391 { "merge-tree", cmd_merge_tree, RUN_SETUP },
112dd514 392 { "mktag", cmd_mktag, RUN_SETUP },
633e3556 393 { "mktree", cmd_mktree, RUN_SETUP },
7ae3df8c 394 { "mv", cmd_mv, RUN_SETUP | NEED_WORK_TREE },
efffea03 395 { "name-rev", cmd_name_rev, RUN_SETUP },
cd067d3b 396 { "notes", cmd_notes, RUN_SETUP },
efffea03 397 { "pack-objects", cmd_pack_objects, RUN_SETUP },
377d0276 398 { "pack-redundant", cmd_pack_redundant, RUN_SETUP },
ef5dd8a9 399 { "pack-refs", cmd_pack_refs, RUN_SETUP },
dedc0ec5 400 { "patch-id", cmd_patch_id },
f0ef6a6e 401 { "peek-remote", cmd_ls_remote, RUN_SETUP_GENTLY },
d97bc5de 402 { "pickaxe", cmd_blame, RUN_SETUP },
efffea03
JH
403 { "prune", cmd_prune, RUN_SETUP },
404 { "prune-packed", cmd_prune_packed, RUN_SETUP },
102cb085 405 { "push", cmd_push, RUN_SETUP },
efffea03 406 { "read-tree", cmd_read_tree, RUN_SETUP },
be5908ae 407 { "receive-pack", cmd_receive_pack },
4264dc15 408 { "reflog", cmd_reflog, RUN_SETUP },
211c8968 409 { "remote", cmd_remote, RUN_SETUP },
7f3ecebf 410 { "remote-ext", cmd_remote_ext },
3a9ed4bd 411 { "remote-fd", cmd_remote_fd },
54b0c1e0 412 { "replace", cmd_replace, RUN_SETUP },
6390c905 413 { "repo-config", cmd_repo_config, RUN_SETUP_GENTLY },
658f3650 414 { "rerere", cmd_rerere, RUN_SETUP },
0e5a7faa 415 { "reset", cmd_reset, RUN_SETUP },
efffea03 416 { "rev-list", cmd_rev_list, RUN_SETUP },
5410a02a 417 { "rev-parse", cmd_rev_parse },
7ae3df8c 418 { "revert", cmd_revert, RUN_SETUP | NEED_WORK_TREE },
271bb087 419 { "rm", cmd_rm, RUN_SETUP },
96249c04 420 { "send-pack", cmd_send_pack, RUN_SETUP },
773b69bf 421 { "shortlog", cmd_shortlog, RUN_SETUP_GENTLY | USE_PAGER },
1fda91b5 422 { "show", cmd_show, RUN_SETUP },
ef5dd8a9
NTND
423 { "show-branch", cmd_show_branch, RUN_SETUP },
424 { "show-ref", cmd_show_ref, RUN_SETUP },
425 { "stage", cmd_add, RUN_SETUP | NEED_WORK_TREE },
10762323 426 { "status", cmd_status, RUN_SETUP | NEED_WORK_TREE },
f754fa9c 427 { "stripspace", cmd_stripspace },
efffea03 428 { "symbolic-ref", cmd_symbolic_ref, RUN_SETUP },
62e09ce9 429 { "tag", cmd_tag, RUN_SETUP },
9cb90b80 430 { "tar-tree", cmd_tar_tree },
b5325818 431 { "unpack-file", cmd_unpack_file, RUN_SETUP },
efffea03
JH
432 { "unpack-objects", cmd_unpack_objects, RUN_SETUP },
433 { "update-index", cmd_update_index, RUN_SETUP },
434 { "update-ref", cmd_update_ref, RUN_SETUP },
53a1116c 435 { "update-server-info", cmd_update_server_info, RUN_SETUP },
39345a21 436 { "upload-archive", cmd_upload_archive },
1bc01efe 437 { "upload-archive--writer", cmd_upload_archive_writer },
2bc8c1a8 438 { "var", cmd_var, RUN_SETUP_GENTLY },
ef5dd8a9 439 { "verify-pack", cmd_verify_pack },
2ae68fcb 440 { "verify-tag", cmd_verify_tag, RUN_SETUP },
f754fa9c 441 { "version", cmd_version },
1fda91b5 442 { "whatchanged", cmd_whatchanged, RUN_SETUP },
efffea03 443 { "write-tree", cmd_write_tree, RUN_SETUP },
231af832
LT
444 };
445 int i;
23326d14
JS
446 static const char ext[] = STRIP_EXTENSION;
447
448 if (sizeof(ext) > 1) {
449 i = strlen(argv[0]) - strlen(ext);
450 if (i > 0 && !strcmp(argv[0] + i, ext)) {
e8eec71d 451 char *argv0 = xstrdup(argv[0]);
23326d14
JS
452 argv[0] = cmd = argv0;
453 argv0[i] = '\0';
454 }
455 }
231af832 456
1cd95087
LT
457 /* Turn "git cmd --help" into "git help cmd" */
458 if (argc > 1 && !strcmp(argv[1], "--help")) {
459 argv[1] = argv[0];
460 argv[0] = cmd = "help";
461 }
462
231af832
LT
463 for (i = 0; i < ARRAY_SIZE(commands); i++) {
464 struct cmd_struct *p = commands+i;
465 if (strcmp(p->cmd, cmd))
466 continue;
f172f334 467 exit(run_builtin(p, argc, argv));
231af832
LT
468 }
469}
470
7550be0a
JH
471static void execv_dashed_external(const char **argv)
472{
f285a2d7 473 struct strbuf cmd = STRBUF_INIT;
7550be0a 474 const char *tmp;
d8e96fd8 475 int status;
7550be0a 476
92058e4d
JK
477 if (use_pager == -1)
478 use_pager = check_pager_config(argv[0]);
030149a4
JN
479 commit_pager_choice();
480
7550be0a
JH
481 strbuf_addf(&cmd, "git-%s", argv[0]);
482
483 /*
484 * argv[0] must be the git command, but the argv array
485 * belongs to the caller, and may be reused in
486 * subsequent loop iterations. Save argv[0] and
487 * restore it on error.
488 */
489 tmp = argv[0];
490 argv[0] = cmd.buf;
491
492 trace_argv_printf(argv, "trace: exec:");
493
d8e96fd8
JK
494 /*
495 * if we fail because the command is not found, it is
496 * OK to return. Otherwise, we just pass along the status code.
497 */
10c6cddd 498 status = run_command_v_opt(argv, RUN_SILENT_EXEC_FAILURE | RUN_CLEAN_ON_EXIT);
0ac77ec3 499 if (status >= 0 || errno != ENOENT)
5709e036 500 exit(status);
7550be0a
JH
501
502 argv[0] = tmp;
503
504 strbuf_release(&cmd);
505}
506
a907e1b6
AS
507static int run_argv(int *argcp, const char ***argv)
508{
509 int done_alias = 0;
510
511 while (1) {
512 /* See if it's an internal command */
513 handle_internal_command(*argcp, *argv);
514
515 /* .. then try the external ones */
516 execv_dashed_external(*argv);
517
518 /* It could be an alias -- this works around the insanity
519 * of overriding "git log" with "git show" by having
520 * alias.log = show
521 */
522 if (done_alias || !handle_alias(argcp, argv))
523 break;
524 done_alias = 1;
525 }
526
527 return done_alias;
528}
529
7550be0a 530
47d0b4ff 531int main(int argc, const char **argv)
8e49d503 532{
4dd47c3b 533 const char *cmd;
231af832 534
e37c1329
NTND
535 startup_info = &git_startup_info;
536
2cd72b0b
SP
537 cmd = git_extract_argv0_path(argv[0]);
538 if (!cmd)
4dd47c3b 539 cmd = "git-help";
8e49d503 540
5e9637c6
ÆAB
541 git_setup_gettext();
542
231af832
LT
543 /*
544 * "git-xxxx" is the same as "git xxxx", but we obviously:
545 *
546 * - cannot take flags in between the "git" and the "xxxx".
547 * - cannot execute it externally (since it would just do
548 * the same thing over again)
549 *
550 * So we just directly call the internal command handler, and
551 * die if that one cannot handle it.
552 */
cc44c765 553 if (!prefixcmp(cmd, "git-")) {
231af832
LT
554 cmd += 4;
555 argv[0] = cmd;
47d0b4ff 556 handle_internal_command(argc, argv);
231af832
LT
557 die("cannot handle %s internally", cmd);
558 }
8e49d503 559
231af832 560 /* Look for flags.. */
6acbcb92
JS
561 argv++;
562 argc--;
4394efec 563 handle_options(&argv, &argc, NULL);
6acbcb92 564 if (argc > 0) {
cc44c765 565 if (!prefixcmp(argv[0], "--"))
6acbcb92
JS
566 argv[0] += 2;
567 } else {
3d7e2d85 568 /* The user didn't specify a command; give them help */
73e25e7c 569 commit_pager_choice();
3d7e2d85
SP
570 printf("usage: %s\n\n", git_usage_string);
571 list_common_cmds_help();
b7d96819 572 printf("\n%s\n", git_more_info_string);
3d7e2d85 573 exit(1);
97fc6c5f 574 }
6acbcb92 575 cmd = argv[0];
231af832
LT
576
577 /*
511707d4 578 * We use PATH to find git commands, but we prepend some higher
3ea3c215 579 * precedence paths: the "--exec-path" option, the GIT_EXEC_PATH
511707d4
SP
580 * environment, and the $(gitexecdir) from the Makefile at build
581 * time.
231af832 582 */
e1464ca7 583 setup_path();
8e49d503 584
a025463b 585 while (1) {
a907e1b6
AS
586 static int done_help = 0;
587 static int was_alias = 0;
588 was_alias = run_argv(&argc, &argv);
589 if (errno != ENOENT)
a025463b 590 break;
a907e1b6 591 if (was_alias) {
f3dd015c 592 fprintf(stderr, "Expansion of alias '%s' failed; "
7283bbc7 593 "'%s' is not a git command\n",
f3dd015c
TT
594 cmd, argv[0]);
595 exit(1);
596 }
a907e1b6
AS
597 if (!done_help) {
598 cmd = argv[0] = help_unknown_cmd(cmd);
599 done_help = 1;
600 } else
601 break;
f3dd015c 602 }
10b15b86
AR
603
604 fprintf(stderr, "Failed to run command '%s': %s\n",
33ebb871 605 cmd, strerror(errno));
8e49d503
AE
606
607 return 1;
608}