[thirdparty/git.git] / git.c

#include "builtin.h"
#include "exec_cmd.h"
#include "cache.h"
#include "quote.h"
#include "run-command.h"

const char git_usage_string[] =
	"git [--version] [--exec-path[=GIT_EXEC_PATH]] [--html-path]\n"
	"           [-p|--paginate|--no-pager] [--no-replace-objects]\n"
	"           [--bare] [--git-dir=GIT_DIR] [--work-tree=GIT_WORK_TREE]\n"
	"           [--help] COMMAND [ARGS]";

const char git_more_info_string[] =
	"See 'git help COMMAND' for more information on a specific command.";

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;
	}
}

static int handle_options(const char ***argv, int *argc, int *envchanged)
{
	int handled = 0;

	if (!getenv("GIT_ASKPASS") && getenv("SSH_ASKPASS"))
		setenv("GIT_ASKPASS", getenv("SSH_ASKPASS"), 1);

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

		/*
		 * 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.
		 */
		if (!prefixcmp(cmd, "--exec-path")) {
			cmd += 11;
			if (*cmd == '=')
				git_set_argv_exec_path(cmd + 1);
			else {
				puts(git_exec_path());
				exit(0);
			}
		} else if (!strcmp(cmd, "--html-path")) {
			puts(system_path(GIT_HTML_PATH));
			exit(0);
		} else if (!strcmp(cmd, "-p") || !strcmp(cmd, "--paginate")) {
			use_pager = 1;
		} else if (!strcmp(cmd, "--no-pager")) {
			use_pager = 0;
			if (envchanged)
				*envchanged = 1;
		} else if (!strcmp(cmd, "--no-replace-objects")) {
			read_replace_refs = 0;
			setenv(NO_REPLACE_OBJECTS_ENVIRONMENT, "1", 1);
			if (envchanged)
				*envchanged = 1;
		} else if (!strcmp(cmd, "--git-dir")) {
			if (*argc < 2) {
				fprintf(stderr, "No directory given for --git-dir.\n" );
				usage(git_usage_string);
			}
			setenv(GIT_DIR_ENVIRONMENT, (*argv)[1], 1);
			if (envchanged)
				*envchanged = 1;
			(*argv)++;
			(*argc)--;
			handled++;
		} else if (!prefixcmp(cmd, "--git-dir=")) {
			setenv(GIT_DIR_ENVIRONMENT, cmd + 10, 1);
			if (envchanged)
				*envchanged = 1;
		} 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);
			if (envchanged)
				*envchanged = 1;
			(*argv)++;
			(*argc)--;
		} else if (!prefixcmp(cmd, "--work-tree=")) {
			setenv(GIT_WORK_TREE_ENVIRONMENT, cmd + 12, 1);
			if (envchanged)
				*envchanged = 1;
		} else if (!strcmp(cmd, "--bare")) {
			static char git_dir[PATH_MAX+1];
			is_bare_repository_cfg = 1;
			setenv(GIT_DIR_ENVIRONMENT, getcwd(git_dir, sizeof(git_dir)), 0);
			if (envchanged)
				*envchanged = 1;
		} else {
			fprintf(stderr, "Unknown option: %s\n", cmd);
			usage(git_usage_string);
		}

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

static int handle_alias(int *argcp, const char ***argv)
{
	int envchanged = 0, ret = 0, saved_errno = errno;
	const char *subdir;
	int count, option_count;
	const char **new_argv;
	const char *alias_command;
	char *alias_string;
	int unused_nongit;

	subdir = setup_git_directory_gently(&unused_nongit);

	alias_command = (*argv)[0];
	alias_string = alias_lookup(alias_command);
	if (alias_string) {
		if (alias_string[0] == '!') {
			if (*argcp > 1) {
				struct strbuf buf;

				strbuf_init(&buf, PATH_MAX);
				strbuf_addstr(&buf, alias_string);
				sq_quote_argv(&buf, (*argv) + 1, PATH_MAX);
				free(alias_string);
				alias_string = buf.buf;
			}
			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));
			die("Failed to run '%s' when expanding alias '%s'",
			    alias_string + 1, alias_command);
		}
		count = split_cmdline(alias_string, &new_argv);
		if (count < 0)
			die("Bad alias.%s string", alias_command);
		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);
		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);

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

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

		*argv = new_argv;
		*argcp += count - 1;

		ret = 1;
	}

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

	errno = saved_errno;

	return ret;
}

const char git_version_string[] = GIT_VERSION;

#define RUN_SETUP	(1<<0)
#define USE_PAGER	(1<<1)
/*
 * require working tree to be present -- anything uses this needs
 * RUN_SETUP for reading from the configuration file.
 */
#define NEED_WORK_TREE	(1<<2)

struct cmd_struct {
	const char *cmd;
	int (*fn)(int, const char **, const char *);
	int option;
};

static int run_builtin(struct cmd_struct *p, int argc, const char **argv)
{
	int status, help;
	struct stat st;
	const char *prefix;

	prefix = NULL;
	help = argc == 2 && !strcmp(argv[1], "-h");
	if (!help) {
		if (p->option & RUN_SETUP)
			prefix = setup_git_directory();

		if (use_pager == -1 && p->option & RUN_SETUP)
			use_pager = check_pager_config(p->cmd);
		if (use_pager == -1 && p->option & USE_PAGER)
			use_pager = 1;
	}
	commit_pager_choice();

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

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

	status = p->fn(argc, argv, prefix);
	if (status)
		return status;

	/* 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.. */
	if (fflush(stdout))
		die_errno("write failure on standard output");
	if (ferror(stdout))
		die("unknown write failure on standard output");
	if (fclose(stdout))
		die_errno("close failed on standard output");
	return 0;
}

static void handle_internal_command(int argc, const char **argv)
{
	const char *cmd = argv[0];
	static struct cmd_struct commands[] = {
		{ "add", cmd_add, RUN_SETUP | NEED_WORK_TREE },
		{ "stage", cmd_add, RUN_SETUP | NEED_WORK_TREE },
		{ "annotate", cmd_annotate, RUN_SETUP },
		{ "apply", cmd_apply },
		{ "archive", cmd_archive },
		{ "bisect--helper", cmd_bisect__helper, RUN_SETUP | NEED_WORK_TREE },
		{ "blame", cmd_blame, RUN_SETUP },
		{ "branch", cmd_branch, RUN_SETUP },
		{ "bundle", cmd_bundle },
		{ "cat-file", cmd_cat_file, RUN_SETUP },
		{ "checkout", cmd_checkout, RUN_SETUP | NEED_WORK_TREE },
		{ "checkout-index", cmd_checkout_index,
			RUN_SETUP | NEED_WORK_TREE},
		{ "check-ref-format", cmd_check_ref_format },
		{ "check-attr", cmd_check_attr, RUN_SETUP },
		{ "cherry", cmd_cherry, RUN_SETUP },
		{ "cherry-pick", cmd_cherry_pick, RUN_SETUP | NEED_WORK_TREE },
		{ "clone", cmd_clone },
		{ "clean", cmd_clean, RUN_SETUP | NEED_WORK_TREE },
		{ "commit", cmd_commit, RUN_SETUP | NEED_WORK_TREE },
		{ "commit-tree", cmd_commit_tree, RUN_SETUP },
		{ "config", cmd_config },
		{ "count-objects", cmd_count_objects, RUN_SETUP },
		{ "describe", cmd_describe, RUN_SETUP },
		{ "diff", cmd_diff },
		{ "diff-files", cmd_diff_files, RUN_SETUP | NEED_WORK_TREE },
		{ "diff-index", cmd_diff_index, RUN_SETUP },
		{ "diff-tree", cmd_diff_tree, RUN_SETUP },
		{ "fast-export", cmd_fast_export, RUN_SETUP },
		{ "fetch", cmd_fetch, RUN_SETUP },
		{ "fetch-pack", cmd_fetch_pack, RUN_SETUP },
		{ "fmt-merge-msg", cmd_fmt_merge_msg, RUN_SETUP },
		{ "for-each-ref", cmd_for_each_ref, RUN_SETUP },
		{ "format-patch", cmd_format_patch, RUN_SETUP },
		{ "fsck", cmd_fsck, RUN_SETUP },
		{ "fsck-objects", cmd_fsck, RUN_SETUP },
		{ "gc", cmd_gc, RUN_SETUP },
		{ "get-tar-commit-id", cmd_get_tar_commit_id },
		{ "grep", cmd_grep, USE_PAGER },
		{ "hash-object", cmd_hash_object },
		{ "help", cmd_help },
		{ "index-pack", cmd_index_pack },
		{ "init", cmd_init_db },
		{ "init-db", cmd_init_db },
		{ "log", cmd_log, RUN_SETUP | USE_PAGER },
		{ "ls-files", cmd_ls_files, RUN_SETUP },
		{ "ls-tree", cmd_ls_tree, RUN_SETUP },
		{ "ls-remote", cmd_ls_remote },
		{ "mailinfo", cmd_mailinfo },
		{ "mailsplit", cmd_mailsplit },
		{ "merge", cmd_merge, RUN_SETUP | NEED_WORK_TREE },
		{ "merge-base", cmd_merge_base, RUN_SETUP },
		{ "merge-file", cmd_merge_file },
		{ "merge-index", cmd_merge_index, RUN_SETUP },
		{ "merge-ours", cmd_merge_ours, RUN_SETUP },
		{ "merge-recursive", cmd_merge_recursive, RUN_SETUP | NEED_WORK_TREE },
		{ "merge-recursive-ours", cmd_merge_recursive, RUN_SETUP | NEED_WORK_TREE },
		{ "merge-recursive-theirs", cmd_merge_recursive, RUN_SETUP | NEED_WORK_TREE },
		{ "merge-subtree", cmd_merge_recursive, RUN_SETUP | NEED_WORK_TREE },
		{ "merge-tree", cmd_merge_tree, RUN_SETUP },
		{ "mktag", cmd_mktag, RUN_SETUP },
		{ "mktree", cmd_mktree, RUN_SETUP },
		{ "mv", cmd_mv, RUN_SETUP | NEED_WORK_TREE },
		{ "name-rev", cmd_name_rev, RUN_SETUP },
		{ "pack-objects", cmd_pack_objects, RUN_SETUP },
		{ "pack-redundant", cmd_pack_redundant, RUN_SETUP },
		{ "patch-id", cmd_patch_id },
		{ "peek-remote", cmd_ls_remote },
		{ "pickaxe", cmd_blame, RUN_SETUP },
		{ "prune", cmd_prune, RUN_SETUP },
		{ "prune-packed", cmd_prune_packed, RUN_SETUP },
		{ "push", cmd_push, RUN_SETUP },
		{ "read-tree", cmd_read_tree, RUN_SETUP },
		{ "receive-pack", cmd_receive_pack },
		{ "reflog", cmd_reflog, RUN_SETUP },
		{ "remote", cmd_remote, RUN_SETUP },
		{ "replace", cmd_replace, RUN_SETUP },
		{ "repo-config", cmd_config },
		{ "rerere", cmd_rerere, RUN_SETUP },
		{ "reset", cmd_reset, RUN_SETUP },
		{ "rev-list", cmd_rev_list, RUN_SETUP },
		{ "rev-parse", cmd_rev_parse },
		{ "revert", cmd_revert, RUN_SETUP | NEED_WORK_TREE },
		{ "rm", cmd_rm, RUN_SETUP },
		{ "send-pack", cmd_send_pack, RUN_SETUP },
		{ "shortlog", cmd_shortlog, USE_PAGER },
		{ "show-branch", cmd_show_branch, RUN_SETUP },
		{ "show", cmd_show, RUN_SETUP | USE_PAGER },
		{ "status", cmd_status, RUN_SETUP | NEED_WORK_TREE },
		{ "stripspace", cmd_stripspace },
		{ "symbolic-ref", cmd_symbolic_ref, RUN_SETUP },
		{ "tag", cmd_tag, RUN_SETUP },
		{ "tar-tree", cmd_tar_tree },
		{ "unpack-file", cmd_unpack_file, RUN_SETUP },
		{ "unpack-objects", cmd_unpack_objects, RUN_SETUP },
		{ "update-index", cmd_update_index, RUN_SETUP },
		{ "update-ref", cmd_update_ref, RUN_SETUP },
		{ "update-server-info", cmd_update_server_info, RUN_SETUP },
		{ "upload-archive", cmd_upload_archive },
		{ "var", cmd_var },
		{ "verify-tag", cmd_verify_tag, RUN_SETUP },
		{ "version", cmd_version },
		{ "whatchanged", cmd_whatchanged, RUN_SETUP | USE_PAGER },
		{ "write-tree", cmd_write_tree, RUN_SETUP },
		{ "verify-pack", cmd_verify_pack },
		{ "show-ref", cmd_show_ref, RUN_SETUP },
		{ "pack-refs", cmd_pack_refs, RUN_SETUP },
	};
	int i;
	static const char ext[] = STRIP_EXTENSION;

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

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

	for (i = 0; i < ARRAY_SIZE(commands); i++) {
		struct cmd_struct *p = commands+i;
		if (strcmp(p->cmd, cmd))
			continue;
		exit(run_builtin(p, argc, argv));
	}
}

static void execv_dashed_external(const char **argv)
{
	struct strbuf cmd = STRBUF_INIT;
	const char *tmp;
	int status;

	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:");

	/*
	 * if we fail because the command is not found, it is
	 * OK to return. Otherwise, we just pass along the status code.
	 */
	status = run_command_v_opt(argv, RUN_SILENT_EXEC_FAILURE);
	if (status >= 0 || errno != ENOENT)
		exit(status);

	argv[0] = tmp;

	strbuf_release(&cmd);
}

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;
}


int main(int argc, const char **argv)
{
	const char *cmd;

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

	/*
	 * "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.
	 */
	if (!prefixcmp(cmd, "git-")) {
		cmd += 4;
		argv[0] = cmd;
		handle_internal_command(argc, argv);
		die("cannot handle %s internally", cmd);
	}

	/* Look for flags.. */
	argv++;
	argc--;
	handle_options(&argv, &argc, NULL);
	commit_pager_choice();
	if (argc > 0) {
		if (!prefixcmp(argv[0], "--"))
			argv[0] += 2;
	} else {
		/* The user didn't specify a command; give them help */
		printf("usage: %s\n\n", git_usage_string);
		list_common_cmds_help();
		printf("\n%s\n", git_more_info_string);
		exit(1);
	}
	cmd = argv[0];

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

	while (1) {
		static int done_help = 0;
		static int was_alias = 0;
		was_alias = run_argv(&argc, &argv);
		if (errno != ENOENT)
			break;
		if (was_alias) {
			fprintf(stderr, "Expansion of alias '%s' failed; "
				"'%s' is not a git command\n",
				cmd, argv[0]);
			exit(1);
		}
		if (!done_help) {
			cmd = argv[0] = help_unknown_cmd(cmd);
			done_help = 1;
		} else
			break;
	}

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

	return 1;
}
Commit	Line	Data
85023577	1	#include "builtin.h"
77cb17e9	2	#include "exec_cmd.h"
2b11e317	3	#include "cache.h"
575ba9d6	4	#include "quote.h"
d8e96fd8	5	#include "run-command.h"
8e49d503	6
822a7d50	7	const char git_usage_string[] =
511a3fc1	8	"git [--version] [--exec-path[=GIT_EXEC_PATH]] [--html-path]\n"
b0fa7ab5	9	" [-p\|--paginate\|--no-pager] [--no-replace-objects]\n"
511a3fc1 MM	10	" [--bare] [--git-dir=GIT_DIR] [--work-tree=GIT_WORK_TREE]\n"
511a3fc1 MM	11	" [--help] COMMAND [ARGS]";
822a7d50	12
b7d96819 TL	13	const char git_more_info_string[] =
	14	"See 'git help COMMAND' for more information on a specific command.";
	15
4e10738a JK	16	static int use_pager = -1;
	17	struct pager_config {
	18	const char *cmd;
	19	int val;
	20	};
	21
	22	static int pager_command_config(const char var, const char value, void *data)
	23	{
	24	struct pager_config *c = data;
	25	if (!prefixcmp(var, "pager.") && !strcmp(var + 6, c->cmd))
	26	c->val = git_config_bool(var, value);
	27	return 0;
	28	}
	29
	30	/* returns 0 for "no pager", 1 for "use pager", and -1 for "not specified" */
	31	int check_pager_config(const char *cmd)
	32	{
	33	struct pager_config c;
	34	c.cmd = cmd;
	35	c.val = -1;
	36	git_config(pager_command_config, &c);
	37	return c.val;
	38	}
	39
	40	static void commit_pager_choice(void) {
	41	switch (use_pager) {
	42	case 0:
	43	setenv("GIT_PAGER", "cat", 1);
	44	break;
	45	case 1:
	46	setup_pager();
	47	break;
	48	default:
	49	break;
	50	}
	51	}
	52
4b25d091	53	static int handle_options(const char **argv, int argc, int *envchanged)
4ab243a9 JS	54	{
	55	int handled = 0;
	56
82cd8358 FL	57	if (!getenv("GIT_ASKPASS") && getenv("SSH_ASKPASS"))
	58	setenv("GIT_ASKPASS", getenv("SSH_ASKPASS"), 1);
	59
4ab243a9 JS	60	while (*argc > 0) {
	61	const char cmd = (argv)[0];
	62	if (cmd[0] != '-')
	63	break;
	64
6acbcb92 JS	65	/*
	66	* For legacy reasons, the "version" and "help"
	67	* commands can be written with "--" prepended
	68	* to make them look like flags.
	69	*/
	70	if (!strcmp(cmd, "--help") \|\| !strcmp(cmd, "--version"))
	71	break;
	72
	73	/*
	74	* Check remaining flags.
	75	*/
cc44c765	76	if (!prefixcmp(cmd, "--exec-path")) {
6acbcb92 JS	77	cmd += 11;
6acbcb92 JS	78	if (*cmd == '=')
384df833	79	git_set_argv_exec_path(cmd + 1);
6acbcb92 JS	80	else {
	81	puts(git_exec_path());
	82	exit(0);
	83	}
89a56bfb MH	84	} else if (!strcmp(cmd, "--html-path")) {
	85	puts(system_path(GIT_HTML_PATH));
	86	exit(0);
6acbcb92	87	} else if (!strcmp(cmd, "-p") \|\| !strcmp(cmd, "--paginate")) {
4e10738a	88	use_pager = 1;
463a849d	89	} else if (!strcmp(cmd, "--no-pager")) {
4e10738a	90	use_pager = 0;
463a849d MM	91	if (envchanged)
463a849d MM	92	*envchanged = 1;
b0fa7ab5 CC	93	} else if (!strcmp(cmd, "--no-replace-objects")) {
b0fa7ab5 CC	94	read_replace_refs = 0;
6476b38b CC	95	setenv(NO_REPLACE_OBJECTS_ENVIRONMENT, "1", 1);
	96	if (envchanged)
	97	*envchanged = 1;
6acbcb92	98	} else if (!strcmp(cmd, "--git-dir")) {
c321f00d BG	99	if (*argc < 2) {
	100	fprintf(stderr, "No directory given for --git-dir.\n" );
	101	usage(git_usage_string);
	102	}
45b09794	103	setenv(GIT_DIR_ENVIRONMENT, (*argv)[1], 1);
4394efec ML	104	if (envchanged)
4394efec ML	105	*envchanged = 1;
6acbcb92 JS	106	(*argv)++;
6acbcb92 JS	107	(*argc)--;
e4b02333	108	handled++;
cc44c765	109	} else if (!prefixcmp(cmd, "--git-dir=")) {
45b09794	110	setenv(GIT_DIR_ENVIRONMENT, cmd + 10, 1);
4394efec ML	111	if (envchanged)
4394efec ML	112	*envchanged = 1;
892c41b9 ML	113	} else if (!strcmp(cmd, "--work-tree")) {
	114	if (*argc < 2) {
	115	fprintf(stderr, "No directory given for --work-tree.\n" );
	116	usage(git_usage_string);
	117	}
	118	setenv(GIT_WORK_TREE_ENVIRONMENT, (*argv)[1], 1);
4394efec ML	119	if (envchanged)
4394efec ML	120	*envchanged = 1;
892c41b9 ML	121	(*argv)++;
	122	(*argc)--;
	123	} else if (!prefixcmp(cmd, "--work-tree=")) {
	124	setenv(GIT_WORK_TREE_ENVIRONMENT, cmd + 12, 1);
4394efec ML	125	if (envchanged)
4394efec ML	126	*envchanged = 1;
6acbcb92	127	} else if (!strcmp(cmd, "--bare")) {
ef5ddb2f	128	static char git_dir[PATH_MAX+1];
6adcca3f	129	is_bare_repository_cfg = 1;
9277d602	130	setenv(GIT_DIR_ENVIRONMENT, getcwd(git_dir, sizeof(git_dir)), 0);
4394efec ML	131	if (envchanged)
4394efec ML	132	*envchanged = 1;
6acbcb92 JS	133	} else {
6acbcb92 JS	134	fprintf(stderr, "Unknown option: %s\n", cmd);
822a7d50	135	usage(git_usage_string);
6acbcb92	136	}
4ab243a9 JS	137
	138	(*argv)++;
	139	(*argc)--;
	140	handled++;
	141	}
	142	return handled;
	143	}
	144
2b11e317 JS	145	static int handle_alias(int argcp, const char **argv)
2b11e317 JS	146	{
af05d679	147	int envchanged = 0, ret = 0, saved_errno = errno;
2b11e317	148	const char *subdir;
0347a8c7	149	int count, option_count;
4b25d091	150	const char **new_argv;
94351118 JK	151	const char *alias_command;
94351118 JK	152	char *alias_string;
e85dc0a3	153	int unused_nongit;
2b11e317	154
e85dc0a3	155	subdir = setup_git_directory_gently(&unused_nongit);
0347a8c7 ML	156
0347a8c7 ML	157	alias_command = (*argv)[0];
94351118	158	alias_string = alias_lookup(alias_command);
0347a8c7	159	if (alias_string) {
dfd42a3c	160	if (alias_string[0] == '!') {
a2f8028d	161	if (*argcp > 1) {
7a33bcbe	162	struct strbuf buf;
a2f8028d	163
7a33bcbe PH	164	strbuf_init(&buf, PATH_MAX);
7a33bcbe PH	165	strbuf_addstr(&buf, alias_string);
b319ce4c	166	sq_quote_argv(&buf, (*argv) + 1, PATH_MAX);
a2f8028d	167	free(alias_string);
7a33bcbe	168	alias_string = buf.buf;
a2f8028d	169	}
dfd42a3c TT	170	trace_printf("trace: alias to shell cmd: %s => %s\n",
	171	alias_command, alias_string + 1);
	172	ret = system(alias_string + 1);
	173	if (ret >= 0 && WIFEXITED(ret) &&
	174	WEXITSTATUS(ret) != 127)
	175	exit(WEXITSTATUS(ret));
d7530708	176	die("Failed to run '%s' when expanding alias '%s'",
dfd42a3c TT	177	alias_string + 1, alias_command);
dfd42a3c TT	178	}
0347a8c7	179	count = split_cmdline(alias_string, &new_argv);
dc4179f9 DM	180	if (count < 0)
dc4179f9 DM	181	die("Bad alias.%s string", alias_command);
4394efec ML	182	option_count = handle_options(&new_argv, &count, &envchanged);
	183	if (envchanged)
	184	die("alias '%s' changes environment variables\n"
	185	"You can use '!git' in the alias to do this.",
	186	alias_command);
0347a8c7 ML	187	memmove(new_argv - option_count, new_argv,
	188	count * sizeof(char *));
	189	new_argv -= option_count;
	190
	191	if (count < 1)
	192	die("empty alias for %s", alias_command);
	193
	194	if (!strcmp(alias_command, new_argv[0]))
	195	die("recursive alias: %s", alias_command);
	196
b319ce4c	197	trace_argv_printf(new_argv,
6ce4e61f CC	198	"trace: alias expansion: %s =>",
6ce4e61f CC	199	alias_command);
575ba9d6	200
4b25d091	201	new_argv = xrealloc(new_argv, sizeof(char )
6167c136	202	(count + *argcp));
0347a8c7	203	/* insert after command name */
4b25d091	204	memcpy(new_argv + count, argv + 1, sizeof(char ) * *argcp);
2b11e317	205
0347a8c7 ML	206	*argv = new_argv;
0347a8c7 ML	207	*argcp += count - 1;
2b11e317	208
0347a8c7	209	ret = 1;
2b11e317 JS	210	}
2b11e317 JS	211
7be77de2	212	if (subdir && chdir(subdir))
d824cbba	213	die_errno("Cannot change to '%s'", subdir);
2b11e317	214
47e5c0ca JS	215	errno = saved_errno;
47e5c0ca JS	216
2b11e317 JS	217	return ret;
	218	}
	219
70827b15	220	const char git_version_string[] = GIT_VERSION;
5b84f4d8	221
efffea03 JH	222	#define RUN_SETUP (1<<0)
efffea03 JH	223	#define USE_PAGER (1<<1)
7eff28a9 SP	224	/*
	225	* require working tree to be present -- anything uses this needs
	226	* RUN_SETUP for reading from the configuration file.
	227	*/
7ae3df8c	228	#define NEED_WORK_TREE (1<<2)
a633fca0	229
47d0b4ff LT	230	struct cmd_struct {
	231	const char *cmd;
	232	int (fn)(int, const char , const char );
	233	int option;
	234	};
	235
f172f334	236	static int run_builtin(struct cmd_struct p, int argc, const char *argv)
47d0b4ff	237	{
99caeed0	238	int status, help;
0f157315	239	struct stat st;
47d0b4ff LT	240	const char *prefix;
	241
	242	prefix = NULL;
99caeed0 JN	243	help = argc == 2 && !strcmp(argv[1], "-h");
	244	if (!help) {
	245	if (p->option & RUN_SETUP)
	246	prefix = setup_git_directory();
	247
	248	if (use_pager == -1 && p->option & RUN_SETUP)
	249	use_pager = check_pager_config(p->cmd);
	250	if (use_pager == -1 && p->option & USE_PAGER)
	251	use_pager = 1;
	252	}
4e10738a JK	253	commit_pager_choice();
4e10738a JK	254
99caeed0	255	if (!help && p->option & NEED_WORK_TREE)
59f0f2f3 MH	256	setup_work_tree();
59f0f2f3 MH	257
b319ce4c	258	trace_argv_printf(argv, "trace: built-in: git");
47d0b4ff	259
0f157315 LT	260	status = p->fn(argc, argv, prefix);
0f157315 LT	261	if (status)
47e3de0e	262	return status;
0f157315 LT	263
	264	/* Somebody closed stdout? */
	265	if (fstat(fileno(stdout), &st))
	266	return 0;
	267	/* Ignore write errors for pipes and sockets.. */
	268	if (S_ISFIFO(st.st_mode) \|\| S_ISSOCK(st.st_mode))
	269	return 0;
	270
	271	/* Check for ENOSPC and EIO errors.. */
0227f988	272	if (fflush(stdout))
d824cbba	273	die_errno("write failure on standard output");
0227f988 LT	274	if (ferror(stdout))
	275	die("unknown write failure on standard output");
	276	if (fclose(stdout))
d824cbba	277	die_errno("close failed on standard output");
0f157315	278	return 0;
47d0b4ff LT	279	}
	280
	281	static void handle_internal_command(int argc, const char **argv)
231af832 LT	282	{
231af832 LT	283	const char *cmd = argv[0];
47d0b4ff	284	static struct cmd_struct commands[] = {
7ae3df8c	285	{ "add", cmd_add, RUN_SETUP \| NEED_WORK_TREE },
11920d28	286	{ "stage", cmd_add, RUN_SETUP \| NEED_WORK_TREE },
d97bc5de	287	{ "annotate", cmd_annotate, RUN_SETUP },
f754fa9c	288	{ "apply", cmd_apply },
265d5280	289	{ "archive", cmd_archive },
1bf072e3	290	{ "bisect--helper", cmd_bisect__helper, RUN_SETUP \| NEED_WORK_TREE },
4f0219a4	291	{ "blame", cmd_blame, RUN_SETUP },
1da1b3a3	292	{ "branch", cmd_branch, RUN_SETUP },
2e0afafe	293	{ "bundle", cmd_bundle },
efffea03	294	{ "cat-file", cmd_cat_file, RUN_SETUP },
782c2d65	295	{ "checkout", cmd_checkout, RUN_SETUP \| NEED_WORK_TREE },
4465f410 JS	296	{ "checkout-index", cmd_checkout_index,
4465f410 JS	297	RUN_SETUP \| NEED_WORK_TREE},
0864f264	298	{ "check-ref-format", cmd_check_ref_format },
2d35d556	299	{ "check-attr", cmd_check_attr, RUN_SETUP },
e827633a	300	{ "cherry", cmd_cherry, RUN_SETUP },
7ae3df8c	301	{ "cherry-pick", cmd_cherry_pick, RUN_SETUP \| NEED_WORK_TREE },
8434c2f1	302	{ "clone", cmd_clone },
113f10f2	303	{ "clean", cmd_clean, RUN_SETUP \| NEED_WORK_TREE },
f5bbc322	304	{ "commit", cmd_commit, RUN_SETUP \| NEED_WORK_TREE },
efffea03	305	{ "commit-tree", cmd_commit_tree, RUN_SETUP },
e0d10e1c	306	{ "config", cmd_config },
8112894d	307	{ "count-objects", cmd_count_objects, RUN_SETUP },
9a0eaf83	308	{ "describe", cmd_describe, RUN_SETUP },
89d07f75	309	{ "diff", cmd_diff },
4f38f6b5	310	{ "diff-files", cmd_diff_files, RUN_SETUP \| NEED_WORK_TREE },
efffea03	311	{ "diff-index", cmd_diff_index, RUN_SETUP },
efffea03	312	{ "diff-tree", cmd_diff_tree, RUN_SETUP },
f2dc849e	313	{ "fast-export", cmd_fast_export, RUN_SETUP },
b888d61c	314	{ "fetch", cmd_fetch, RUN_SETUP },
2d4177c0	315	{ "fetch-pack", cmd_fetch_pack, RUN_SETUP },
efffea03	316	{ "fmt-merge-msg", cmd_fmt_merge_msg, RUN_SETUP },
9f613ddd	317	{ "for-each-ref", cmd_for_each_ref, RUN_SETUP },
efffea03	318	{ "format-patch", cmd_format_patch, RUN_SETUP },
b4dfefe0 MW	319	{ "fsck", cmd_fsck, RUN_SETUP },
b4dfefe0 MW	320	{ "fsck-objects", cmd_fsck, RUN_SETUP },
6757ada4	321	{ "gc", cmd_gc, RUN_SETUP },
f754fa9c	322	{ "get-tar-commit-id", cmd_get_tar_commit_id },
59332d13	323	{ "grep", cmd_grep, USE_PAGER },
b28a1ce0	324	{ "hash-object", cmd_hash_object },
f754fa9c	325	{ "help", cmd_help },
3bb72562	326	{ "index-pack", cmd_index_pack },
515377ea	327	{ "init", cmd_init_db },
f754fa9c	328	{ "init-db", cmd_init_db },
efffea03 JH	329	{ "log", cmd_log, RUN_SETUP \| USE_PAGER },
	330	{ "ls-files", cmd_ls_files, RUN_SETUP },
	331	{ "ls-tree", cmd_ls_tree, RUN_SETUP },
8951d7c1	332	{ "ls-remote", cmd_ls_remote },
f754fa9c JH	333	{ "mailinfo", cmd_mailinfo },
f754fa9c JH	334	{ "mailsplit", cmd_mailsplit },
1c7b76be	335	{ "merge", cmd_merge, RUN_SETUP \| NEED_WORK_TREE },
71dfbf22	336	{ "merge-base", cmd_merge_base, RUN_SETUP },
ba1f5f35	337	{ "merge-file", cmd_merge_file },
0ecace72	338	{ "merge-index", cmd_merge_index, RUN_SETUP },
a00a42ae	339	{ "merge-ours", cmd_merge_ours, RUN_SETUP },
e1b3a2ca	340	{ "merge-recursive", cmd_merge_recursive, RUN_SETUP \| NEED_WORK_TREE },
8cc5b290 AP	341	{ "merge-recursive-ours", cmd_merge_recursive, RUN_SETUP \| NEED_WORK_TREE },
8cc5b290 AP	342	{ "merge-recursive-theirs", cmd_merge_recursive, RUN_SETUP \| NEED_WORK_TREE },
1736855c	343	{ "merge-subtree", cmd_merge_recursive, RUN_SETUP \| NEED_WORK_TREE },
907a7cb5	344	{ "merge-tree", cmd_merge_tree, RUN_SETUP },
112dd514	345	{ "mktag", cmd_mktag, RUN_SETUP },
633e3556	346	{ "mktree", cmd_mktree, RUN_SETUP },
7ae3df8c	347	{ "mv", cmd_mv, RUN_SETUP \| NEED_WORK_TREE },
efffea03 JH	348	{ "name-rev", cmd_name_rev, RUN_SETUP },
efffea03 JH	349	{ "pack-objects", cmd_pack_objects, RUN_SETUP },
377d0276	350	{ "pack-redundant", cmd_pack_redundant, RUN_SETUP },
dedc0ec5	351	{ "patch-id", cmd_patch_id },
8951d7c1	352	{ "peek-remote", cmd_ls_remote },
d97bc5de	353	{ "pickaxe", cmd_blame, RUN_SETUP },
efffea03 JH	354	{ "prune", cmd_prune, RUN_SETUP },
efffea03 JH	355	{ "prune-packed", cmd_prune_packed, RUN_SETUP },
102cb085	356	{ "push", cmd_push, RUN_SETUP },
efffea03	357	{ "read-tree", cmd_read_tree, RUN_SETUP },
be5908ae	358	{ "receive-pack", cmd_receive_pack },
4264dc15	359	{ "reflog", cmd_reflog, RUN_SETUP },
211c8968	360	{ "remote", cmd_remote, RUN_SETUP },
54b0c1e0	361	{ "replace", cmd_replace, RUN_SETUP },
e0d10e1c	362	{ "repo-config", cmd_config },
658f3650	363	{ "rerere", cmd_rerere, RUN_SETUP },
0e5a7faa	364	{ "reset", cmd_reset, RUN_SETUP },
efffea03	365	{ "rev-list", cmd_rev_list, RUN_SETUP },
5410a02a	366	{ "rev-parse", cmd_rev_parse },
7ae3df8c	367	{ "revert", cmd_revert, RUN_SETUP \| NEED_WORK_TREE },
271bb087	368	{ "rm", cmd_rm, RUN_SETUP },
96249c04	369	{ "send-pack", cmd_send_pack, RUN_SETUP },
abe549e1	370	{ "shortlog", cmd_shortlog, USE_PAGER },
efffea03 JH	371	{ "show-branch", cmd_show_branch, RUN_SETUP },
efffea03 JH	372	{ "show", cmd_show, RUN_SETUP \| USE_PAGER },
10762323	373	{ "status", cmd_status, RUN_SETUP \| NEED_WORK_TREE },
f754fa9c	374	{ "stripspace", cmd_stripspace },
efffea03	375	{ "symbolic-ref", cmd_symbolic_ref, RUN_SETUP },
62e09ce9	376	{ "tag", cmd_tag, RUN_SETUP },
9cb90b80	377	{ "tar-tree", cmd_tar_tree },
b5325818	378	{ "unpack-file", cmd_unpack_file, RUN_SETUP },
efffea03 JH	379	{ "unpack-objects", cmd_unpack_objects, RUN_SETUP },
	380	{ "update-index", cmd_update_index, RUN_SETUP },
	381	{ "update-ref", cmd_update_ref, RUN_SETUP },
53a1116c	382	{ "update-server-info", cmd_update_server_info, RUN_SETUP },
39345a21	383	{ "upload-archive", cmd_upload_archive },
55b6745d	384	{ "var", cmd_var },
2ae68fcb	385	{ "verify-tag", cmd_verify_tag, RUN_SETUP },
f754fa9c	386	{ "version", cmd_version },
efffea03 JH	387	{ "whatchanged", cmd_whatchanged, RUN_SETUP \| USE_PAGER },
efffea03 JH	388	{ "write-tree", cmd_write_tree, RUN_SETUP },
2e3ed670	389	{ "verify-pack", cmd_verify_pack },
358ddb62	390	{ "show-ref", cmd_show_ref, RUN_SETUP },
e1e22e37	391	{ "pack-refs", cmd_pack_refs, RUN_SETUP },
231af832 LT	392	};
231af832 LT	393	int i;
23326d14 JS	394	static const char ext[] = STRIP_EXTENSION;
	395
	396	if (sizeof(ext) > 1) {
	397	i = strlen(argv[0]) - strlen(ext);
	398	if (i > 0 && !strcmp(argv[0] + i, ext)) {
e8eec71d	399	char *argv0 = xstrdup(argv[0]);
23326d14 JS	400	argv[0] = cmd = argv0;
	401	argv0[i] = '\0';
	402	}
	403	}
231af832	404
1cd95087 LT	405	/* Turn "git cmd --help" into "git help cmd" */
	406	if (argc > 1 && !strcmp(argv[1], "--help")) {
	407	argv[1] = argv[0];
	408	argv[0] = cmd = "help";
	409	}
	410
231af832 LT	411	for (i = 0; i < ARRAY_SIZE(commands); i++) {
	412	struct cmd_struct *p = commands+i;
	413	if (strcmp(p->cmd, cmd))
	414	continue;
f172f334	415	exit(run_builtin(p, argc, argv));
231af832 LT	416	}
	417	}
	418
7550be0a JH	419	static void execv_dashed_external(const char **argv)
7550be0a JH	420	{
f285a2d7	421	struct strbuf cmd = STRBUF_INIT;
7550be0a	422	const char *tmp;
d8e96fd8	423	int status;
7550be0a	424
7550be0a JH	425	strbuf_addf(&cmd, "git-%s", argv[0]);
	426
	427	/*
	428	* argv[0] must be the git command, but the argv array
	429	* belongs to the caller, and may be reused in
	430	* subsequent loop iterations. Save argv[0] and
	431	* restore it on error.
	432	*/
	433	tmp = argv[0];
	434	argv[0] = cmd.buf;
	435
	436	trace_argv_printf(argv, "trace: exec:");
	437
d8e96fd8 JK	438	/*
	439	* if we fail because the command is not found, it is
	440	* OK to return. Otherwise, we just pass along the status code.
	441	*/
c024beb5	442	status = run_command_v_opt(argv, RUN_SILENT_EXEC_FAILURE);
0ac77ec3	443	if (status >= 0 \|\| errno != ENOENT)
5709e036	444	exit(status);
7550be0a JH	445
	446	argv[0] = tmp;
	447
	448	strbuf_release(&cmd);
	449	}
	450
a907e1b6 AS	451	static int run_argv(int argcp, const char **argv)
	452	{
	453	int done_alias = 0;
	454
	455	while (1) {
	456	/* See if it's an internal command */
	457	handle_internal_command(argcp, argv);
	458
	459	/* .. then try the external ones */
	460	execv_dashed_external(*argv);
	461
	462	/* It could be an alias -- this works around the insanity
	463	* of overriding "git log" with "git show" by having
	464	* alias.log = show
	465	*/
	466	if (done_alias \|\| !handle_alias(argcp, argv))
	467	break;
	468	done_alias = 1;
	469	}
	470
	471	return done_alias;
	472	}
	473
7550be0a	474
47d0b4ff	475	int main(int argc, const char **argv)
8e49d503	476	{
4dd47c3b	477	const char *cmd;
231af832	478
2cd72b0b SP	479	cmd = git_extract_argv0_path(argv[0]);
2cd72b0b SP	480	if (!cmd)
4dd47c3b	481	cmd = "git-help";
8e49d503	482
231af832 LT	483	/*
	484	* "git-xxxx" is the same as "git xxxx", but we obviously:
	485	*
	486	* - cannot take flags in between the "git" and the "xxxx".
	487	* - cannot execute it externally (since it would just do
	488	* the same thing over again)
	489	*
	490	* So we just directly call the internal command handler, and
	491	* die if that one cannot handle it.
	492	*/
cc44c765	493	if (!prefixcmp(cmd, "git-")) {
231af832 LT	494	cmd += 4;
231af832 LT	495	argv[0] = cmd;
47d0b4ff	496	handle_internal_command(argc, argv);
231af832 LT	497	die("cannot handle %s internally", cmd);
231af832 LT	498	}
8e49d503	499
231af832	500	/* Look for flags.. */
6acbcb92 JS	501	argv++;
6acbcb92 JS	502	argc--;
4394efec	503	handle_options(&argv, &argc, NULL);
4e10738a	504	commit_pager_choice();
6acbcb92	505	if (argc > 0) {
cc44c765	506	if (!prefixcmp(argv[0], "--"))
6acbcb92 JS	507	argv[0] += 2;
6acbcb92 JS	508	} else {
3d7e2d85 SP	509	/* The user didn't specify a command; give them help */
	510	printf("usage: %s\n\n", git_usage_string);
	511	list_common_cmds_help();
b7d96819	512	printf("\n%s\n", git_more_info_string);
3d7e2d85	513	exit(1);
97fc6c5f	514	}
6acbcb92	515	cmd = argv[0];
231af832 LT	516
231af832 LT	517	/*
511707d4	518	* We use PATH to find git commands, but we prepend some higher
3ea3c215	519	* precedence paths: the "--exec-path" option, the GIT_EXEC_PATH
511707d4 SP	520	* environment, and the $(gitexecdir) from the Makefile at build
511707d4 SP	521	* time.
231af832	522	*/
e1464ca7	523	setup_path();
8e49d503	524
a025463b	525	while (1) {
a907e1b6 AS	526	static int done_help = 0;
	527	static int was_alias = 0;
	528	was_alias = run_argv(&argc, &argv);
	529	if (errno != ENOENT)
a025463b	530	break;
a907e1b6	531	if (was_alias) {
f3dd015c	532	fprintf(stderr, "Expansion of alias '%s' failed; "
7283bbc7	533	"'%s' is not a git command\n",
f3dd015c TT	534	cmd, argv[0]);
	535	exit(1);
	536	}
a907e1b6 AS	537	if (!done_help) {
	538	cmd = argv[0] = help_unknown_cmd(cmd);
	539	done_help = 1;
	540	} else
	541	break;
f3dd015c	542	}
10b15b86 AR	543
10b15b86 AR	544	fprintf(stderr, "Failed to run command '%s': %s\n",
33ebb871	545	cmd, strerror(errno));
8e49d503 AE	546
	547	return 1;
	548	}