git.c 15.8 KB
Newer Older
1
#include "builtin.h"
2
#include "cache.h"
3 4
#include "exec_cmd.h"
#include "help.h"
5
#include "quote.h"
6
#include "run-command.h"
7

8
const char git_usage_string[] =
9
	"git [--version] [--exec-path[=<path>]] [--html-path]\n"
10
	"           [-p|--paginate|--no-pager] [--no-replace-objects]\n"
11
	"           [--bare] [--git-dir=<path>] [--work-tree=<path>]\n"
12
	"           [-c name=value] [--help]\n"
13
	"           <command> [<args>]";
14

15
const char git_more_info_string[] =
16
	"See 'git help <command>' for more information on a specific command.";
17

18
static struct startup_info git_startup_info;
19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55
static int use_pager = -1;
struct pager_config {
	const char *cmd;
	int val;
};

static int pager_command_config(const char *var, const char *value, void *data)
{
	struct pager_config *c = data;
	if (!prefixcmp(var, "pager.") && !strcmp(var + 6, c->cmd))
		c->val = git_config_bool(var, value);
	return 0;
}

/* returns 0 for "no pager", 1 for "use pager", and -1 for "not specified" */
int check_pager_config(const char *cmd)
{
	struct pager_config c;
	c.cmd = cmd;
	c.val = -1;
	git_config(pager_command_config, &c);
	return c.val;
}

static void commit_pager_choice(void) {
	switch (use_pager) {
	case 0:
		setenv("GIT_PAGER", "cat", 1);
		break;
	case 1:
		setup_pager();
		break;
	default:
		break;
	}
}

56
static int handle_options(const char ***argv, int *argc, int *envchanged)
57 58 59 60 61 62 63 64
{
	int handled = 0;

	while (*argc > 0) {
		const char *cmd = (*argv)[0];
		if (cmd[0] != '-')
			break;

65 66 67 68 69 70 71 72 73 74 75
		/*
		 * For legacy reasons, the "version" and "help"
		 * commands can be written with "--" prepended
		 * to make them look like flags.
		 */
		if (!strcmp(cmd, "--help") || !strcmp(cmd, "--version"))
			break;

		/*
		 * Check remaining flags.
		 */
76
		if (!prefixcmp(cmd, "--exec-path")) {
77 78
			cmd += 11;
			if (*cmd == '=')
79
				git_set_argv_exec_path(cmd + 1);
80 81 82 83
			else {
				puts(git_exec_path());
				exit(0);
			}
84 85 86
		} else if (!strcmp(cmd, "--html-path")) {
			puts(system_path(GIT_HTML_PATH));
			exit(0);
87
		} else if (!strcmp(cmd, "-p") || !strcmp(cmd, "--paginate")) {
88
			use_pager = 1;
89
		} else if (!strcmp(cmd, "--no-pager")) {
90
			use_pager = 0;
91 92
			if (envchanged)
				*envchanged = 1;
93 94
		} else if (!strcmp(cmd, "--no-replace-objects")) {
			read_replace_refs = 0;
95 96 97
			setenv(NO_REPLACE_OBJECTS_ENVIRONMENT, "1", 1);
			if (envchanged)
				*envchanged = 1;
98
		} else if (!strcmp(cmd, "--git-dir")) {
99 100 101 102
			if (*argc < 2) {
				fprintf(stderr, "No directory given for --git-dir.\n" );
				usage(git_usage_string);
			}
103
			setenv(GIT_DIR_ENVIRONMENT, (*argv)[1], 1);
104 105
			if (envchanged)
				*envchanged = 1;
106 107
			(*argv)++;
			(*argc)--;
108
			handled++;
109
		} else if (!prefixcmp(cmd, "--git-dir=")) {
110
			setenv(GIT_DIR_ENVIRONMENT, cmd + 10, 1);
111 112
			if (envchanged)
				*envchanged = 1;
113 114 115 116 117 118
		} else if (!strcmp(cmd, "--work-tree")) {
			if (*argc < 2) {
				fprintf(stderr, "No directory given for --work-tree.\n" );
				usage(git_usage_string);
			}
			setenv(GIT_WORK_TREE_ENVIRONMENT, (*argv)[1], 1);
119 120
			if (envchanged)
				*envchanged = 1;
121 122 123 124
			(*argv)++;
			(*argc)--;
		} else if (!prefixcmp(cmd, "--work-tree=")) {
			setenv(GIT_WORK_TREE_ENVIRONMENT, cmd + 12, 1);
125 126
			if (envchanged)
				*envchanged = 1;
127
		} else if (!strcmp(cmd, "--bare")) {
128
			static char git_dir[PATH_MAX+1];
129
			is_bare_repository_cfg = 1;
130
			setenv(GIT_DIR_ENVIRONMENT, getcwd(git_dir, sizeof(git_dir)), 0);
131 132
			if (envchanged)
				*envchanged = 1;
133 134 135 136 137
		} else if (!strcmp(cmd, "-c")) {
			if (*argc < 2) {
				fprintf(stderr, "-c expects a configuration string\n" );
				usage(git_usage_string);
			}
138
			git_config_push_parameter((*argv)[1]);
139 140
			(*argv)++;
			(*argc)--;
141 142
		} else {
			fprintf(stderr, "Unknown option: %s\n", cmd);
143
			usage(git_usage_string);
144
		}
145 146 147 148 149 150 151 152

		(*argv)++;
		(*argc)--;
		handled++;
	}
	return handled;
}

153 154
static int handle_alias(int *argcp, const char ***argv)
{
155
	int envchanged = 0, ret = 0, saved_errno = errno;
156
	const char *subdir;
157
	int count, option_count;
158
	const char **new_argv;
159 160
	const char *alias_command;
	char *alias_string;
161
	int unused_nongit;
162

163
	subdir = setup_git_directory_gently(&unused_nongit);
164 165

	alias_command = (*argv)[0];
166
	alias_string = alias_lookup(alias_command);
167
	if (alias_string) {
168
		if (alias_string[0] == '!') {
169
			commit_pager_choice();
170
			if (*argcp > 1) {
171
				struct strbuf buf;
172

173 174
				strbuf_init(&buf, PATH_MAX);
				strbuf_addstr(&buf, alias_string);
175
				sq_quote_argv(&buf, (*argv) + 1, PATH_MAX);
176
				free(alias_string);
177
				alias_string = buf.buf;
178
			}
179 180 181 182 183 184
			trace_printf("trace: alias to shell cmd: %s => %s\n",
				     alias_command, alias_string + 1);
			ret = system(alias_string + 1);
			if (ret >= 0 && WIFEXITED(ret) &&
			    WEXITSTATUS(ret) != 127)
				exit(WEXITSTATUS(ret));
185
			die("Failed to run '%s' when expanding alias '%s'",
186 187
			    alias_string + 1, alias_command);
		}
188
		count = split_cmdline(alias_string, &new_argv);
189
		if (count < 0)
190 191
			die("Bad alias.%s string: %s", alias_command,
			    split_cmdline_strerror(count));
192 193 194 195 196
		option_count = handle_options(&new_argv, &count, &envchanged);
		if (envchanged)
			die("alias '%s' changes environment variables\n"
				 "You can use '!git' in the alias to do this.",
				 alias_command);
197 198 199 200 201 202 203 204 205 206
		memmove(new_argv - option_count, new_argv,
				count * sizeof(char *));
		new_argv -= option_count;

		if (count < 1)
			die("empty alias for %s", alias_command);

		if (!strcmp(alias_command, new_argv[0]))
			die("recursive alias: %s", alias_command);

207
		trace_argv_printf(new_argv,
208 209
				  "trace: alias expansion: %s =>",
				  alias_command);
210

211
		new_argv = xrealloc(new_argv, sizeof(char *) *
212
				    (count + *argcp));
213
		/* insert after command name */
214
		memcpy(new_argv + count, *argv + 1, sizeof(char *) * *argcp);
215

216 217
		*argv = new_argv;
		*argcp += count - 1;
218

219
		ret = 1;
220 221
	}

222
	if (subdir && chdir(subdir))
223
		die_errno("Cannot change to '%s'", subdir);
224

225 226
	errno = saved_errno;

227 228 229
	return ret;
}

230
const char git_version_string[] = GIT_VERSION;
231

232 233 234
#define RUN_SETUP		(1<<0)
#define RUN_SETUP_GENTLY	(1<<1)
#define USE_PAGER		(1<<2)
235 236 237 238
/*
 * require working tree to be present -- anything uses this needs
 * RUN_SETUP for reading from the configuration file.
 */
239
#define NEED_WORK_TREE		(1<<3)
240

241 242 243 244 245 246
struct cmd_struct {
	const char *cmd;
	int (*fn)(int, const char **, const char *);
	int option;
};

247
static int run_builtin(struct cmd_struct *p, int argc, const char **argv)
248
{
249
	int status, help;
250
	struct stat st;
251 252 253
	const char *prefix;

	prefix = NULL;
254 255 256 257
	help = argc == 2 && !strcmp(argv[1], "-h");
	if (!help) {
		if (p->option & RUN_SETUP)
			prefix = setup_git_directory();
258 259 260 261
		if (p->option & RUN_SETUP_GENTLY) {
			int nongit_ok;
			prefix = setup_git_directory_gently(&nongit_ok);
		}
262

263
		if (use_pager == -1 && p->option & (RUN_SETUP | RUN_SETUP_GENTLY))
264 265 266
			use_pager = check_pager_config(p->cmd);
		if (use_pager == -1 && p->option & USE_PAGER)
			use_pager = 1;
267 268 269 270

		if ((p->option & (RUN_SETUP | RUN_SETUP_GENTLY)) &&
		    startup_info->have_repository) /* get_git_dir() may set up repo, avoid that */
			trace_repo_setup(prefix);
271
	}
272 273
	commit_pager_choice();

274
	if (!help && p->option & NEED_WORK_TREE)
275 276
		setup_work_tree();

277
	trace_argv_printf(argv, "trace: built-in: git");
278

279 280
	status = p->fn(argc, argv, prefix);
	if (status)
281
		return status;
282 283 284 285 286 287 288 289 290

	/* Somebody closed stdout? */
	if (fstat(fileno(stdout), &st))
		return 0;
	/* Ignore write errors for pipes and sockets.. */
	if (S_ISFIFO(st.st_mode) || S_ISSOCK(st.st_mode))
		return 0;

	/* Check for ENOSPC and EIO errors.. */
291
	if (fflush(stdout))
292
		die_errno("write failure on standard output");
293 294 295
	if (ferror(stdout))
		die("unknown write failure on standard output");
	if (fclose(stdout))
296
		die_errno("close failed on standard output");
297
	return 0;
298 299 300
}

static void handle_internal_command(int argc, const char **argv)
301 302
{
	const char *cmd = argv[0];
303
	static struct cmd_struct commands[] = {
304
		{ "add", cmd_add, RUN_SETUP | NEED_WORK_TREE },
305
		{ "stage", cmd_add, RUN_SETUP | NEED_WORK_TREE },
306
		{ "annotate", cmd_annotate, RUN_SETUP },
307
		{ "apply", cmd_apply, RUN_SETUP_GENTLY },
308
		{ "archive", cmd_archive },
309
		{ "bisect--helper", cmd_bisect__helper, RUN_SETUP | NEED_WORK_TREE },
310
		{ "blame", cmd_blame, RUN_SETUP },
311
		{ "branch", cmd_branch, RUN_SETUP },
312
		{ "bundle", cmd_bundle, RUN_SETUP_GENTLY },
313
		{ "cat-file", cmd_cat_file, RUN_SETUP },
Daniel Barkalow's avatar
Daniel Barkalow committed
314
		{ "checkout", cmd_checkout, RUN_SETUP | NEED_WORK_TREE },
315 316
		{ "checkout-index", cmd_checkout_index,
			RUN_SETUP | NEED_WORK_TREE},
Peter Eriksen's avatar
Peter Eriksen committed
317
		{ "check-ref-format", cmd_check_ref_format },
318
		{ "check-attr", cmd_check_attr, RUN_SETUP },
Rene Scharfe's avatar
Rene Scharfe committed
319
		{ "cherry", cmd_cherry, RUN_SETUP },
320
		{ "cherry-pick", cmd_cherry_pick, RUN_SETUP | NEED_WORK_TREE },
Daniel Barkalow's avatar
Daniel Barkalow committed
321
		{ "clone", cmd_clone },
Shawn Bohrer's avatar
Shawn Bohrer committed
322
		{ "clean", cmd_clean, RUN_SETUP | NEED_WORK_TREE },
323
		{ "commit", cmd_commit, RUN_SETUP | NEED_WORK_TREE },
324
		{ "commit-tree", cmd_commit_tree, RUN_SETUP },
325
		{ "config", cmd_config, RUN_SETUP_GENTLY },
326
		{ "count-objects", cmd_count_objects, RUN_SETUP },
327
		{ "describe", cmd_describe, RUN_SETUP },
328
		{ "diff", cmd_diff },
Duy Nguyen's avatar
Duy Nguyen committed
329
		{ "diff-files", cmd_diff_files, RUN_SETUP | NEED_WORK_TREE },
330 331
		{ "diff-index", cmd_diff_index, RUN_SETUP },
		{ "diff-tree", cmd_diff_tree, RUN_SETUP },
332
		{ "fast-export", cmd_fast_export, RUN_SETUP },
Daniel Barkalow's avatar
Daniel Barkalow committed
333
		{ "fetch", cmd_fetch, RUN_SETUP },
334
		{ "fetch-pack", cmd_fetch_pack, RUN_SETUP },
335
		{ "fmt-merge-msg", cmd_fmt_merge_msg, RUN_SETUP },
336
		{ "for-each-ref", cmd_for_each_ref, RUN_SETUP },
337
		{ "format-patch", cmd_format_patch, RUN_SETUP },
338 339
		{ "fsck", cmd_fsck, RUN_SETUP },
		{ "fsck-objects", cmd_fsck, RUN_SETUP },
James Bowes's avatar
James Bowes committed
340
		{ "gc", cmd_gc, RUN_SETUP },
341
		{ "get-tar-commit-id", cmd_get_tar_commit_id },
342
		{ "grep", cmd_grep, RUN_SETUP_GENTLY },
343
		{ "hash-object", cmd_hash_object },
344
		{ "help", cmd_help },
345
		{ "index-pack", cmd_index_pack, RUN_SETUP_GENTLY },
346
		{ "init", cmd_init_db },
347
		{ "init-db", cmd_init_db },
348
		{ "log", cmd_log, RUN_SETUP },
349 350
		{ "ls-files", cmd_ls_files, RUN_SETUP },
		{ "ls-tree", cmd_ls_tree, RUN_SETUP },
351
		{ "ls-remote", cmd_ls_remote, RUN_SETUP_GENTLY },
352 353
		{ "mailinfo", cmd_mailinfo },
		{ "mailsplit", cmd_mailsplit },
Miklos Vajna's avatar
Miklos Vajna committed
354
		{ "merge", cmd_merge, RUN_SETUP | NEED_WORK_TREE },
355
		{ "merge-base", cmd_merge_base, RUN_SETUP },
356
		{ "merge-file", cmd_merge_file, RUN_SETUP_GENTLY },
357
		{ "merge-index", cmd_merge_index, RUN_SETUP },
358
		{ "merge-ours", cmd_merge_ours, RUN_SETUP },
359
		{ "merge-recursive", cmd_merge_recursive, RUN_SETUP | NEED_WORK_TREE },
Avery Pennarun's avatar
Avery Pennarun committed
360 361
		{ "merge-recursive-ours", cmd_merge_recursive, RUN_SETUP | NEED_WORK_TREE },
		{ "merge-recursive-theirs", cmd_merge_recursive, RUN_SETUP | NEED_WORK_TREE },
Junio C Hamano's avatar
Junio C Hamano committed
362
		{ "merge-subtree", cmd_merge_recursive, RUN_SETUP | NEED_WORK_TREE },
363
		{ "merge-tree", cmd_merge_tree, RUN_SETUP },
Linus Torvalds's avatar
Linus Torvalds committed
364
		{ "mktag", cmd_mktag, RUN_SETUP },
Junio C Hamano's avatar
Junio C Hamano committed
365
		{ "mktree", cmd_mktree, RUN_SETUP },
366
		{ "mv", cmd_mv, RUN_SETUP | NEED_WORK_TREE },
367
		{ "name-rev", cmd_name_rev, RUN_SETUP },
Johan Herland's avatar
Johan Herland committed
368
		{ "notes", cmd_notes, RUN_SETUP },
369
		{ "pack-objects", cmd_pack_objects, RUN_SETUP },
370
		{ "pack-redundant", cmd_pack_redundant, RUN_SETUP },
371
		{ "patch-id", cmd_patch_id },
372
		{ "peek-remote", cmd_ls_remote, RUN_SETUP_GENTLY },
373
		{ "pickaxe", cmd_blame, RUN_SETUP },
374 375
		{ "prune", cmd_prune, RUN_SETUP },
		{ "prune-packed", cmd_prune_packed, RUN_SETUP },
376
		{ "push", cmd_push, RUN_SETUP },
377
		{ "read-tree", cmd_read_tree, RUN_SETUP },
378
		{ "receive-pack", cmd_receive_pack },
Junio C Hamano's avatar
Junio C Hamano committed
379
		{ "reflog", cmd_reflog, RUN_SETUP },
380
		{ "remote", cmd_remote, RUN_SETUP },
381
		{ "replace", cmd_replace, RUN_SETUP },
382
		{ "repo-config", cmd_config, RUN_SETUP_GENTLY },
383
		{ "rerere", cmd_rerere, RUN_SETUP },
384
		{ "reset", cmd_reset, RUN_SETUP },
385
		{ "rev-list", cmd_rev_list, RUN_SETUP },
386
		{ "rev-parse", cmd_rev_parse },
387
		{ "revert", cmd_revert, RUN_SETUP | NEED_WORK_TREE },
388
		{ "rm", cmd_rm, RUN_SETUP },
389
		{ "send-pack", cmd_send_pack, RUN_SETUP },
390
		{ "shortlog", cmd_shortlog, RUN_SETUP_GENTLY | USE_PAGER },
391
		{ "show-branch", cmd_show_branch, RUN_SETUP },
392
		{ "show", cmd_show, RUN_SETUP },
393
		{ "status", cmd_status, RUN_SETUP | NEED_WORK_TREE },
394
		{ "stripspace", cmd_stripspace },
395
		{ "symbolic-ref", cmd_symbolic_ref, RUN_SETUP },
Carlos Rica's avatar
Carlos Rica committed
396
		{ "tag", cmd_tag, RUN_SETUP },
397
		{ "tar-tree", cmd_tar_tree },
398
		{ "unpack-file", cmd_unpack_file, RUN_SETUP },
399 400 401
		{ "unpack-objects", cmd_unpack_objects, RUN_SETUP },
		{ "update-index", cmd_update_index, RUN_SETUP },
		{ "update-ref", cmd_update_ref, RUN_SETUP },
402
		{ "update-server-info", cmd_update_server_info, RUN_SETUP },
Franck Bui-Huu's avatar
Franck Bui-Huu committed
403
		{ "upload-archive", cmd_upload_archive },
404
		{ "var", cmd_var, RUN_SETUP_GENTLY },
Carlos Rica's avatar
Carlos Rica committed
405
		{ "verify-tag", cmd_verify_tag, RUN_SETUP },
406
		{ "version", cmd_version },
407
		{ "whatchanged", cmd_whatchanged, RUN_SETUP },
408
		{ "write-tree", cmd_write_tree, RUN_SETUP },
409
		{ "verify-pack", cmd_verify_pack },
410
		{ "show-ref", cmd_show_ref, RUN_SETUP },
411
		{ "pack-refs", cmd_pack_refs, RUN_SETUP },
412 413
	};
	int i;
414 415 416 417 418
	static const char ext[] = STRIP_EXTENSION;

	if (sizeof(ext) > 1) {
		i = strlen(argv[0]) - strlen(ext);
		if (i > 0 && !strcmp(argv[0] + i, ext)) {
419
			char *argv0 = xstrdup(argv[0]);
420 421 422 423
			argv[0] = cmd = argv0;
			argv0[i] = '\0';
		}
	}
424

425 426 427 428 429 430
	/* Turn "git cmd --help" into "git help cmd" */
	if (argc > 1 && !strcmp(argv[1], "--help")) {
		argv[1] = argv[0];
		argv[0] = cmd = "help";
	}

431 432 433 434
	for (i = 0; i < ARRAY_SIZE(commands); i++) {
		struct cmd_struct *p = commands+i;
		if (strcmp(p->cmd, cmd))
			continue;
435
		exit(run_builtin(p, argc, argv));
436 437 438
	}
}

439 440
static void execv_dashed_external(const char **argv)
{
441
	struct strbuf cmd = STRBUF_INIT;
442
	const char *tmp;
443
	int status;
444

445 446
	commit_pager_choice();

447 448 449 450 451 452 453 454 455 456 457 458 459
	strbuf_addf(&cmd, "git-%s", argv[0]);

	/*
	 * argv[0] must be the git command, but the argv array
	 * belongs to the caller, and may be reused in
	 * subsequent loop iterations. Save argv[0] and
	 * restore it on error.
	 */
	tmp = argv[0];
	argv[0] = cmd.buf;

	trace_argv_printf(argv, "trace: exec:");

460 461 462 463
	/*
	 * if we fail because the command is not found, it is
	 * OK to return. Otherwise, we just pass along the status code.
	 */
464
	status = run_command_v_opt(argv, RUN_SILENT_EXEC_FAILURE);
465
	if (status >= 0 || errno != ENOENT)
466
		exit(status);
467 468 469 470 471 472

	argv[0] = tmp;

	strbuf_release(&cmd);
}

473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495
static int run_argv(int *argcp, const char ***argv)
{
	int done_alias = 0;

	while (1) {
		/* See if it's an internal command */
		handle_internal_command(*argcp, *argv);

		/* .. then try the external ones */
		execv_dashed_external(*argv);

		/* It could be an alias -- this works around the insanity
		 * of overriding "git log" with "git show" by having
		 * alias.log = show
		 */
		if (done_alias || !handle_alias(argcp, argv))
			break;
		done_alias = 1;
	}

	return done_alias;
}

496

497
int main(int argc, const char **argv)
498
{
499
	const char *cmd;
500

501 502
	startup_info = &git_startup_info;

503 504
	cmd = git_extract_argv0_path(argv[0]);
	if (!cmd)
505
		cmd = "git-help";
506

507 508 509 510 511 512 513 514 515 516
	/*
	 * "git-xxxx" is the same as "git xxxx", but we obviously:
	 *
	 *  - cannot take flags in between the "git" and the "xxxx".
	 *  - cannot execute it externally (since it would just do
	 *    the same thing over again)
	 *
	 * So we just directly call the internal command handler, and
	 * die if that one cannot handle it.
	 */
517
	if (!prefixcmp(cmd, "git-")) {
518 519
		cmd += 4;
		argv[0] = cmd;
520
		handle_internal_command(argc, argv);
521 522
		die("cannot handle %s internally", cmd);
	}
523

524
	/* Look for flags.. */
525 526
	argv++;
	argc--;
527
	handle_options(&argv, &argc, NULL);
528
	if (argc > 0) {
529
		if (!prefixcmp(argv[0], "--"))
530 531
			argv[0] += 2;
	} else {
532
		/* The user didn't specify a command; give them help */
533
		commit_pager_choice();
534 535
		printf("usage: %s\n\n", git_usage_string);
		list_common_cmds_help();
536
		printf("\n%s\n", git_more_info_string);
537
		exit(1);
538
	}
539
	cmd = argv[0];
540 541

	/*
542
	 * We use PATH to find git commands, but we prepend some higher
543
	 * precedence paths: the "--exec-path" option, the GIT_EXEC_PATH
544 545
	 * environment, and the $(gitexecdir) from the Makefile at build
	 * time.
546
	 */
547
	setup_path();
548

549
	while (1) {
550 551 552 553
		static int done_help = 0;
		static int was_alias = 0;
		was_alias = run_argv(&argc, &argv);
		if (errno != ENOENT)
554
			break;
555
		if (was_alias) {
556
			fprintf(stderr, "Expansion of alias '%s' failed; "
557
				"'%s' is not a git command\n",
558 559 560
				cmd, argv[0]);
			exit(1);
		}
561 562 563 564 565
		if (!done_help) {
			cmd = argv[0] = help_unknown_cmd(cmd);
			done_help = 1;
		} else
			break;
566
	}
567 568

	fprintf(stderr, "Failed to run command '%s': %s\n",
569
		cmd, strerror(errno));
570 571 572

	return 1;
}