[thirdparty/git.git] / git.c

#include "builtin.h"
#include "exec_cmd.h"
#include "cache.h"
#include "quote.h"

const char git_usage_string[] =
	"git [--version] [--exec-path[=GIT_EXEC_PATH]] [-p|--paginate|--no-pager] [--bare] [--git-dir=GIT_DIR] [--work-tree=GIT_WORK_TREE] [--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;

	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, "-p") || !strcmp(cmd, "--paginate")) {
			use_pager = 1;
		} else if (!strcmp(cmd, "--no-pager")) {
			use_pager = 0;
			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 + 1));
		/* insert after command name */
		memcpy(new_argv + count, *argv + 1, sizeof(char*) * *argcp);
		new_argv[count+*argcp] = NULL;

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

		ret = 1;
	}

	if (subdir && chdir(subdir))
		die("Cannot change to %s: %s", subdir, strerror(errno));

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

	prefix = NULL;
	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 (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 & 0xff;

	/* 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("write failure on standard output: %s", strerror(errno));
	if (ferror(stdout))
		die("unknown write failure on standard output");
	if (fclose(stdout))
		die("close failed on standard output: %s", strerror(errno));
	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 },
		{ "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 },
		{ "fetch--tool", cmd_fetch__tool, 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, RUN_SETUP | USE_PAGER },
		{ "help", cmd_help },
#ifndef NO_CURL
		{ "http-fetch", cmd_http_fetch, RUN_SETUP },
#endif
		{ "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-ours", cmd_merge_ours, RUN_SETUP },
		{ "merge-recursive", cmd_merge_recursive, RUN_SETUP | NEED_WORK_TREE },
		{ "merge-subtree", cmd_merge_recursive, RUN_SETUP | NEED_WORK_TREE },
		{ "mv", cmd_mv, RUN_SETUP | NEED_WORK_TREE },
		{ "name-rev", cmd_name_rev, RUN_SETUP },
		{ "pack-objects", cmd_pack_objects, RUN_SETUP },
		{ "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 },
		{ "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-objects", cmd_unpack_objects, RUN_SETUP },
		{ "update-index", cmd_update_index, RUN_SETUP },
		{ "update-ref", cmd_update_ref, RUN_SETUP },
		{ "upload-archive", cmd_upload_archive },
		{ "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_command(p, argc, argv));
	}
}

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

	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:");

	/* execvp() can only ever return if it fails */
	execvp(cmd.buf, (char **)argv);

	trace_printf("trace: exec failed: %s\n", strerror(errno));

	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 = argv[0] && *argv[0] ? argv[0] : "git-help";
	char *slash = (char *)cmd + strlen(cmd);

	/*
	 * Take the basename of argv[0] as the command
	 * name, and the dirname as the default exec_path
	 * if we don't have anything better.
	 */
	while (cmd <= slash && !is_dir_sep(*slash))
		slash--;
	if (cmd <= slash) {
		*slash++ = 0;
		git_set_argv0_path(cmd);
		cmd = slash;
	}

	/*
	 * "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
	 * precidence 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"
8e49d503	5
822a7d50	6	const 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	9	const char git_more_info_string[] =
	10	"See 'git help COMMAND' for more information on a specific command.";
	11
4e10738a JK	12	static int use_pager = -1;
	13	struct pager_config {
	14	const char *cmd;
	15	int val;
	16	};
	17
	18	static 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" */
	27	int 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
	36	static 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	49	static 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;
6acbcb92 JS	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)
463a849d MM	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)
4394efec ML	90	*envchanged = 1;
6acbcb92 JS	91	(*argv)++;
6acbcb92 JS	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)
4394efec ML	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)
4394efec ML	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)
4394efec ML	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)
4394efec ML	117	*envchanged = 1;
6acbcb92 JS	118	} else {
6acbcb92 JS	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	130	static int handle_alias(int argcp, const char **argv)
2b11e317 JS	131	{
af05d679	132	int envchanged = 0, ret = 0, saved_errno = errno;
2b11e317	133	const char *subdir;
0347a8c7 ML	134	int count, option_count;
0347a8c7 ML	135	const char** new_argv;
94351118 JK	136	const char *alias_command;
94351118 JK	137	char *alias_string;
e85dc0a3	138	int unused_nongit;
2b11e317	139
e85dc0a3	140	subdir = setup_git_directory_gently(&unused_nongit);
0347a8c7 ML	141
0347a8c7 ML	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);
7a33bcbe PH	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));
d7530708	161	die("Failed to run '%s' when expanding alias '%s'",
dfd42a3c TT	162	alias_string + 1, alias_command);
dfd42a3c TT	163	}
0347a8c7	164	count = split_cmdline(alias_string, &new_argv);
dc4179f9 DM	165	if (count < 0)
dc4179f9 DM	166	die("Bad alias.%s string", alias_command);
4394efec ML	167	option_count = handle_options(&new_argv, &count, &envchanged);
	168	if (envchanged)
	169	die("alias '%s' changes environment variables\n"
	170	"You can use '!git' in the alias to do this.",
	171	alias_command);
0347a8c7 ML	172	memmove(new_argv - option_count, new_argv,
	173	count * sizeof(char *));
	174	new_argv -= option_count;
	175
	176	if (count < 1)
	177	die("empty alias for %s", alias_command);
	178
	179	if (!strcmp(alias_command, new_argv[0]))
	180	die("recursive alias: %s", alias_command);
	181
b319ce4c	182	trace_argv_printf(new_argv,
6ce4e61f CC	183	"trace: alias expansion: %s =>",
6ce4e61f CC	184	alias_command);
575ba9d6	185
83572c1a JF	186	new_argv = xrealloc(new_argv, sizeof(char)
83572c1a JF	187	(count + *argcp + 1));
0347a8c7 ML	188	/* insert after command name */
	189	memcpy(new_argv + count, argv + 1, sizeof(char) * *argcp);
	190	new_argv[count+*argcp] = NULL;
2b11e317	191
0347a8c7 ML	192	*argv = new_argv;
0347a8c7 ML	193	*argcp += count - 1;
2b11e317	194
0347a8c7	195	ret = 1;
2b11e317 JS	196	}
2b11e317 JS	197
7be77de2 AR	198	if (subdir && chdir(subdir))
7be77de2 AR	199	die("Cannot change to %s: %s", subdir, strerror(errno));
2b11e317	200
47e5c0ca JS	201	errno = saved_errno;
47e5c0ca JS	202
2b11e317 JS	203	return ret;
	204	}
	205
70827b15	206	const char git_version_string[] = GIT_VERSION;
5b84f4d8	207
efffea03 JH	208	#define RUN_SETUP (1<<0)
efffea03 JH	209	#define USE_PAGER (1<<1)
7eff28a9 SP	210	/*
	211	* require working tree to be present -- anything uses this needs
	212	* RUN_SETUP for reading from the configuration file.
	213	*/
7ae3df8c	214	#define NEED_WORK_TREE (1<<2)
a633fca0	215
47d0b4ff LT	216	struct cmd_struct {
	217	const char *cmd;
	218	int (fn)(int, const char , const char );
	219	int option;
	220	};
	221
	222	static int run_command(struct cmd_struct p, int argc, const char *argv)
	223	{
0f157315 LT	224	int status;
0f157315 LT	225	struct stat st;
47d0b4ff LT	226	const char *prefix;
	227
	228	prefix = NULL;
	229	if (p->option & RUN_SETUP)
	230	prefix = setup_git_directory();
4e10738a JK	231
	232	if (use_pager == -1 && p->option & RUN_SETUP)
	233	use_pager = check_pager_config(p->cmd);
	234	if (use_pager == -1 && p->option & USE_PAGER)
	235	use_pager = 1;
	236	commit_pager_choice();
	237
59f0f2f3 MH	238	if (p->option & NEED_WORK_TREE)
	239	setup_work_tree();
	240
b319ce4c	241	trace_argv_printf(argv, "trace: built-in: git");
47d0b4ff	242
0f157315 LT	243	status = p->fn(argc, argv, prefix);
0f157315 LT	244	if (status)
2488df84	245	return status & 0xff;
0f157315 LT	246
	247	/* Somebody closed stdout? */
	248	if (fstat(fileno(stdout), &st))
	249	return 0;
	250	/* Ignore write errors for pipes and sockets.. */
	251	if (S_ISFIFO(st.st_mode) \|\| S_ISSOCK(st.st_mode))
	252	return 0;
	253
	254	/* Check for ENOSPC and EIO errors.. */
0227f988	255	if (fflush(stdout))
0f157315	256	die("write failure on standard output: %s", strerror(errno));
0227f988 LT	257	if (ferror(stdout))
	258	die("unknown write failure on standard output");
	259	if (fclose(stdout))
	260	die("close failed on standard output: %s", strerror(errno));
0f157315	261	return 0;
47d0b4ff LT	262	}
	263
	264	static void handle_internal_command(int argc, const char **argv)
231af832 LT	265	{
231af832 LT	266	const char *cmd = argv[0];
47d0b4ff	267	static struct cmd_struct commands[] = {
7ae3df8c	268	{ "add", cmd_add, RUN_SETUP \| NEED_WORK_TREE },
11920d28	269	{ "stage", cmd_add, RUN_SETUP \| NEED_WORK_TREE },
d97bc5de	270	{ "annotate", cmd_annotate, RUN_SETUP },
f754fa9c	271	{ "apply", cmd_apply },
265d5280	272	{ "archive", cmd_archive },
4f0219a4	273	{ "blame", cmd_blame, RUN_SETUP },
1da1b3a3	274	{ "branch", cmd_branch, RUN_SETUP },
2e0afafe	275	{ "bundle", cmd_bundle },
efffea03	276	{ "cat-file", cmd_cat_file, RUN_SETUP },
782c2d65	277	{ "checkout", cmd_checkout, RUN_SETUP \| NEED_WORK_TREE },
4465f410 JS	278	{ "checkout-index", cmd_checkout_index,
4465f410 JS	279	RUN_SETUP \| NEED_WORK_TREE},
0864f264	280	{ "check-ref-format", cmd_check_ref_format },
2d35d556	281	{ "check-attr", cmd_check_attr, RUN_SETUP },
e827633a	282	{ "cherry", cmd_cherry, RUN_SETUP },
7ae3df8c	283	{ "cherry-pick", cmd_cherry_pick, RUN_SETUP \| NEED_WORK_TREE },
8434c2f1	284	{ "clone", cmd_clone },
113f10f2	285	{ "clean", cmd_clean, RUN_SETUP \| NEED_WORK_TREE },
f5bbc322	286	{ "commit", cmd_commit, RUN_SETUP \| NEED_WORK_TREE },
efffea03	287	{ "commit-tree", cmd_commit_tree, RUN_SETUP },
e0d10e1c	288	{ "config", cmd_config },
8112894d	289	{ "count-objects", cmd_count_objects, RUN_SETUP },
9a0eaf83	290	{ "describe", cmd_describe, RUN_SETUP },
89d07f75	291	{ "diff", cmd_diff },
4f38f6b5	292	{ "diff-files", cmd_diff_files, RUN_SETUP \| NEED_WORK_TREE },
efffea03	293	{ "diff-index", cmd_diff_index, RUN_SETUP },
efffea03	294	{ "diff-tree", cmd_diff_tree, RUN_SETUP },
f2dc849e	295	{ "fast-export", cmd_fast_export, RUN_SETUP },
b888d61c	296	{ "fetch", cmd_fetch, RUN_SETUP },
2d4177c0	297	{ "fetch-pack", cmd_fetch_pack, RUN_SETUP },
d4289fff	298	{ "fetch--tool", cmd_fetch__tool, RUN_SETUP },
efffea03	299	{ "fmt-merge-msg", cmd_fmt_merge_msg, RUN_SETUP },
9f613ddd	300	{ "for-each-ref", cmd_for_each_ref, RUN_SETUP },
efffea03	301	{ "format-patch", cmd_format_patch, RUN_SETUP },
b4dfefe0 MW	302	{ "fsck", cmd_fsck, RUN_SETUP },
b4dfefe0 MW	303	{ "fsck-objects", cmd_fsck, RUN_SETUP },
6757ada4	304	{ "gc", cmd_gc, RUN_SETUP },
f754fa9c	305	{ "get-tar-commit-id", cmd_get_tar_commit_id },
34c6a82b	306	{ "grep", cmd_grep, RUN_SETUP \| USE_PAGER },
f754fa9c	307	{ "help", cmd_help },
30ae764b DB	308	#ifndef NO_CURL
	309	{ "http-fetch", cmd_http_fetch, RUN_SETUP },
	310	#endif
515377ea	311	{ "init", cmd_init_db },
f754fa9c	312	{ "init-db", cmd_init_db },
efffea03 JH	313	{ "log", cmd_log, RUN_SETUP \| USE_PAGER },
	314	{ "ls-files", cmd_ls_files, RUN_SETUP },
	315	{ "ls-tree", cmd_ls_tree, RUN_SETUP },
8951d7c1	316	{ "ls-remote", cmd_ls_remote },
f754fa9c JH	317	{ "mailinfo", cmd_mailinfo },
f754fa9c JH	318	{ "mailsplit", cmd_mailsplit },
1c7b76be	319	{ "merge", cmd_merge, RUN_SETUP \| NEED_WORK_TREE },
71dfbf22	320	{ "merge-base", cmd_merge_base, RUN_SETUP },
ba1f5f35	321	{ "merge-file", cmd_merge_file },
a00a42ae	322	{ "merge-ours", cmd_merge_ours, RUN_SETUP },
e1b3a2ca	323	{ "merge-recursive", cmd_merge_recursive, RUN_SETUP \| NEED_WORK_TREE },
1736855c	324	{ "merge-subtree", cmd_merge_recursive, RUN_SETUP \| NEED_WORK_TREE },
7ae3df8c	325	{ "mv", cmd_mv, RUN_SETUP \| NEED_WORK_TREE },
efffea03 JH	326	{ "name-rev", cmd_name_rev, RUN_SETUP },
efffea03 JH	327	{ "pack-objects", cmd_pack_objects, RUN_SETUP },
8951d7c1	328	{ "peek-remote", cmd_ls_remote },
d97bc5de	329	{ "pickaxe", cmd_blame, RUN_SETUP },
efffea03 JH	330	{ "prune", cmd_prune, RUN_SETUP },
efffea03 JH	331	{ "prune-packed", cmd_prune_packed, RUN_SETUP },
102cb085	332	{ "push", cmd_push, RUN_SETUP },
efffea03	333	{ "read-tree", cmd_read_tree, RUN_SETUP },
be5908ae	334	{ "receive-pack", cmd_receive_pack },
4264dc15	335	{ "reflog", cmd_reflog, RUN_SETUP },
211c8968	336	{ "remote", cmd_remote, RUN_SETUP },
e0d10e1c	337	{ "repo-config", cmd_config },
658f3650	338	{ "rerere", cmd_rerere, RUN_SETUP },
0e5a7faa	339	{ "reset", cmd_reset, RUN_SETUP },
efffea03	340	{ "rev-list", cmd_rev_list, RUN_SETUP },
5410a02a	341	{ "rev-parse", cmd_rev_parse },
7ae3df8c	342	{ "revert", cmd_revert, RUN_SETUP \| NEED_WORK_TREE },
271bb087	343	{ "rm", cmd_rm, RUN_SETUP },
96249c04	344	{ "send-pack", cmd_send_pack, RUN_SETUP },
abe549e1	345	{ "shortlog", cmd_shortlog, USE_PAGER },
efffea03 JH	346	{ "show-branch", cmd_show_branch, RUN_SETUP },
efffea03 JH	347	{ "show", cmd_show, RUN_SETUP \| USE_PAGER },
10762323	348	{ "status", cmd_status, RUN_SETUP \| NEED_WORK_TREE },
f754fa9c	349	{ "stripspace", cmd_stripspace },
efffea03	350	{ "symbolic-ref", cmd_symbolic_ref, RUN_SETUP },
62e09ce9	351	{ "tag", cmd_tag, RUN_SETUP },
9cb90b80	352	{ "tar-tree", cmd_tar_tree },
efffea03 JH	353	{ "unpack-objects", cmd_unpack_objects, RUN_SETUP },
	354	{ "update-index", cmd_update_index, RUN_SETUP },
	355	{ "update-ref", cmd_update_ref, RUN_SETUP },
39345a21	356	{ "upload-archive", cmd_upload_archive },
2ae68fcb	357	{ "verify-tag", cmd_verify_tag, RUN_SETUP },
f754fa9c	358	{ "version", cmd_version },
efffea03 JH	359	{ "whatchanged", cmd_whatchanged, RUN_SETUP \| USE_PAGER },
efffea03 JH	360	{ "write-tree", cmd_write_tree, RUN_SETUP },
2e3ed670	361	{ "verify-pack", cmd_verify_pack },
358ddb62	362	{ "show-ref", cmd_show_ref, RUN_SETUP },
e1e22e37	363	{ "pack-refs", cmd_pack_refs, RUN_SETUP },
231af832 LT	364	};
231af832 LT	365	int i;
23326d14 JS	366	static const char ext[] = STRIP_EXTENSION;
	367
	368	if (sizeof(ext) > 1) {
	369	i = strlen(argv[0]) - strlen(ext);
	370	if (i > 0 && !strcmp(argv[0] + i, ext)) {
e8eec71d	371	char *argv0 = xstrdup(argv[0]);
23326d14 JS	372	argv[0] = cmd = argv0;
	373	argv0[i] = '\0';
	374	}
	375	}
231af832	376
1cd95087 LT	377	/* Turn "git cmd --help" into "git help cmd" */
	378	if (argc > 1 && !strcmp(argv[1], "--help")) {
	379	argv[1] = argv[0];
	380	argv[0] = cmd = "help";
	381	}
	382
231af832 LT	383	for (i = 0; i < ARRAY_SIZE(commands); i++) {
	384	struct cmd_struct *p = commands+i;
	385	if (strcmp(p->cmd, cmd))
	386	continue;
47d0b4ff	387	exit(run_command(p, argc, argv));
231af832 LT	388	}
	389	}
	390
7550be0a JH	391	static void execv_dashed_external(const char **argv)
7550be0a JH	392	{
f285a2d7	393	struct strbuf cmd = STRBUF_INIT;
7550be0a JH	394	const char *tmp;
7550be0a JH	395
7550be0a JH	396	strbuf_addf(&cmd, "git-%s", argv[0]);
	397
	398	/*
	399	* argv[0] must be the git command, but the argv array
	400	* belongs to the caller, and may be reused in
	401	* subsequent loop iterations. Save argv[0] and
	402	* restore it on error.
	403	*/
	404	tmp = argv[0];
	405	argv[0] = cmd.buf;
	406
	407	trace_argv_printf(argv, "trace: exec:");
	408
	409	/* execvp() can only ever return if it fails */
	410	execvp(cmd.buf, (char **)argv);
	411
	412	trace_printf("trace: exec failed: %s\n", strerror(errno));
	413
	414	argv[0] = tmp;
	415
	416	strbuf_release(&cmd);
	417	}
	418
a907e1b6 AS	419	static int run_argv(int argcp, const char **argv)
	420	{
	421	int done_alias = 0;
	422
	423	while (1) {
	424	/* See if it's an internal command */
	425	handle_internal_command(argcp, argv);
	426
	427	/* .. then try the external ones */
	428	execv_dashed_external(*argv);
	429
	430	/* It could be an alias -- this works around the insanity
	431	* of overriding "git log" with "git show" by having
	432	* alias.log = show
	433	*/
	434	if (done_alias \|\| !handle_alias(argcp, argv))
	435	break;
	436	done_alias = 1;
	437	}
	438
	439	return done_alias;
	440	}
	441
7550be0a	442
47d0b4ff	443	int main(int argc, const char **argv)
8e49d503	444	{
23326d14 JS	445	const char cmd = argv[0] && argv[0] ? argv[0] : "git-help";
23326d14 JS	446	char slash = (char )cmd + strlen(cmd);
231af832 LT	447
	448	/*
	449	* Take the basename of argv[0] as the command
	450	* name, and the dirname as the default exec_path
43db492a	451	* if we don't have anything better.
231af832	452	*/
cca17048 JS	453	while (cmd <= slash && !is_dir_sep(*slash))
cca17048 JS	454	slash--;
23326d14	455	if (cmd <= slash) {
231af832	456	*slash++ = 0;
e1464ca7	457	git_set_argv0_path(cmd);
231af832 LT	458	cmd = slash;
231af832 LT	459	}
8e49d503	460
231af832 LT	461	/*
	462	* "git-xxxx" is the same as "git xxxx", but we obviously:
	463	*
	464	* - cannot take flags in between the "git" and the "xxxx".
	465	* - cannot execute it externally (since it would just do
	466	* the same thing over again)
	467	*
	468	* So we just directly call the internal command handler, and
	469	* die if that one cannot handle it.
	470	*/
cc44c765	471	if (!prefixcmp(cmd, "git-")) {
231af832 LT	472	cmd += 4;
231af832 LT	473	argv[0] = cmd;
47d0b4ff	474	handle_internal_command(argc, argv);
231af832 LT	475	die("cannot handle %s internally", cmd);
231af832 LT	476	}
8e49d503	477
231af832	478	/* Look for flags.. */
6acbcb92 JS	479	argv++;
6acbcb92 JS	480	argc--;
4394efec	481	handle_options(&argv, &argc, NULL);
4e10738a	482	commit_pager_choice();
6acbcb92	483	if (argc > 0) {
cc44c765	484	if (!prefixcmp(argv[0], "--"))
6acbcb92 JS	485	argv[0] += 2;
6acbcb92 JS	486	} else {
3d7e2d85 SP	487	/* The user didn't specify a command; give them help */
	488	printf("usage: %s\n\n", git_usage_string);
	489	list_common_cmds_help();
b7d96819	490	printf("\n%s\n", git_more_info_string);
3d7e2d85	491	exit(1);
97fc6c5f	492	}
6acbcb92	493	cmd = argv[0];
231af832 LT	494
231af832 LT	495	/*
511707d4 SP	496	* We use PATH to find git commands, but we prepend some higher
	497	* precidence paths: the "--exec-path" option, the GIT_EXEC_PATH
	498	* environment, and the $(gitexecdir) from the Makefile at build
	499	* time.
231af832	500	*/
e1464ca7	501	setup_path();
8e49d503	502
a025463b	503	while (1) {
a907e1b6 AS	504	static int done_help = 0;
	505	static int was_alias = 0;
	506	was_alias = run_argv(&argc, &argv);
	507	if (errno != ENOENT)
a025463b	508	break;
a907e1b6	509	if (was_alias) {
f3dd015c TT	510	fprintf(stderr, "Expansion of alias '%s' failed; "
	511	"'%s' is not a git-command\n",
	512	cmd, argv[0]);
	513	exit(1);
	514	}
a907e1b6 AS	515	if (!done_help) {
	516	cmd = argv[0] = help_unknown_cmd(cmd);
	517	done_help = 1;
	518	} else
	519	break;
f3dd015c	520	}
10b15b86 AR	521
10b15b86 AR	522	fprintf(stderr, "Failed to run command '%s': %s\n",
33ebb871	523	cmd, strerror(errno));
8e49d503 AE	524
	525	return 1;
	526	}