[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"
	"           [-c name=value] [--help]\n"
	"           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 if (!strcmp(cmd, "-c")) {
			if (*argc < 2) {
				fprintf(stderr, "-c expects a configuration string\n" );
				usage(git_usage_string);
			}
			git_config_parse_parameter((*argv)[1]);
			(*argv)++;
			(*argc)--;
		} 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] == '!') {
			commit_pager_choice();
			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 },
		{ "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 },
		{ "notes", cmd_notes, 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;

	commit_pager_choice();

	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);
	if (argc > 0) {
		if (!prefixcmp(argv[0], "--"))
			argv[0] += 2;
	} else {
		/* The user didn't specify a command; give them help */
		commit_pager_choice();
		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	10	" [--bare] [--git-dir=GIT_DIR] [--work-tree=GIT_WORK_TREE]\n"
293b07f1 TR	11	" [-c name=value] [--help]\n"
293b07f1 TR	12	" COMMAND [ARGS]";
822a7d50	13
b7d96819 TL	14	const char git_more_info_string[] =
	15	"See 'git help COMMAND' for more information on a specific command.";
	16
4e10738a JK	17	static int use_pager = -1;
	18	struct pager_config {
	19	const char *cmd;
	20	int val;
	21	};
	22
	23	static int pager_command_config(const char var, const char value, void *data)
	24	{
	25	struct pager_config *c = data;
	26	if (!prefixcmp(var, "pager.") && !strcmp(var + 6, c->cmd))
	27	c->val = git_config_bool(var, value);
	28	return 0;
	29	}
	30
	31	/* returns 0 for "no pager", 1 for "use pager", and -1 for "not specified" */
	32	int check_pager_config(const char *cmd)
	33	{
	34	struct pager_config c;
	35	c.cmd = cmd;
	36	c.val = -1;
	37	git_config(pager_command_config, &c);
	38	return c.val;
	39	}
	40
	41	static void commit_pager_choice(void) {
	42	switch (use_pager) {
	43	case 0:
	44	setenv("GIT_PAGER", "cat", 1);
	45	break;
	46	case 1:
	47	setup_pager();
	48	break;
	49	default:
	50	break;
	51	}
	52	}
	53
4b25d091	54	static int handle_options(const char **argv, int argc, int *envchanged)
4ab243a9 JS	55	{
	56	int handled = 0;
	57
82cd8358 FL	58	if (!getenv("GIT_ASKPASS") && getenv("SSH_ASKPASS"))
	59	setenv("GIT_ASKPASS", getenv("SSH_ASKPASS"), 1);
	60
4ab243a9 JS	61	while (*argc > 0) {
	62	const char cmd = (argv)[0];
	63	if (cmd[0] != '-')
	64	break;
	65
6acbcb92 JS	66	/*
	67	* For legacy reasons, the "version" and "help"
	68	* commands can be written with "--" prepended
	69	* to make them look like flags.
	70	*/
	71	if (!strcmp(cmd, "--help") \|\| !strcmp(cmd, "--version"))
	72	break;
	73
	74	/*
	75	* Check remaining flags.
	76	*/
cc44c765	77	if (!prefixcmp(cmd, "--exec-path")) {
6acbcb92 JS	78	cmd += 11;
6acbcb92 JS	79	if (*cmd == '=')
384df833	80	git_set_argv_exec_path(cmd + 1);
6acbcb92 JS	81	else {
	82	puts(git_exec_path());
	83	exit(0);
	84	}
89a56bfb MH	85	} else if (!strcmp(cmd, "--html-path")) {
	86	puts(system_path(GIT_HTML_PATH));
	87	exit(0);
6acbcb92	88	} else if (!strcmp(cmd, "-p") \|\| !strcmp(cmd, "--paginate")) {
4e10738a	89	use_pager = 1;
463a849d	90	} else if (!strcmp(cmd, "--no-pager")) {
4e10738a	91	use_pager = 0;
463a849d MM	92	if (envchanged)
463a849d MM	93	*envchanged = 1;
b0fa7ab5 CC	94	} else if (!strcmp(cmd, "--no-replace-objects")) {
b0fa7ab5 CC	95	read_replace_refs = 0;
6476b38b CC	96	setenv(NO_REPLACE_OBJECTS_ENVIRONMENT, "1", 1);
	97	if (envchanged)
	98	*envchanged = 1;
6acbcb92	99	} else if (!strcmp(cmd, "--git-dir")) {
c321f00d BG	100	if (*argc < 2) {
	101	fprintf(stderr, "No directory given for --git-dir.\n" );
	102	usage(git_usage_string);
	103	}
45b09794	104	setenv(GIT_DIR_ENVIRONMENT, (*argv)[1], 1);
4394efec ML	105	if (envchanged)
4394efec ML	106	*envchanged = 1;
6acbcb92 JS	107	(*argv)++;
6acbcb92 JS	108	(*argc)--;
e4b02333	109	handled++;
cc44c765	110	} else if (!prefixcmp(cmd, "--git-dir=")) {
45b09794	111	setenv(GIT_DIR_ENVIRONMENT, cmd + 10, 1);
4394efec ML	112	if (envchanged)
4394efec ML	113	*envchanged = 1;
892c41b9 ML	114	} else if (!strcmp(cmd, "--work-tree")) {
	115	if (*argc < 2) {
	116	fprintf(stderr, "No directory given for --work-tree.\n" );
	117	usage(git_usage_string);
	118	}
	119	setenv(GIT_WORK_TREE_ENVIRONMENT, (*argv)[1], 1);
4394efec ML	120	if (envchanged)
4394efec ML	121	*envchanged = 1;
892c41b9 ML	122	(*argv)++;
	123	(*argc)--;
	124	} else if (!prefixcmp(cmd, "--work-tree=")) {
	125	setenv(GIT_WORK_TREE_ENVIRONMENT, cmd + 12, 1);
4394efec ML	126	if (envchanged)
4394efec ML	127	*envchanged = 1;
6acbcb92	128	} else if (!strcmp(cmd, "--bare")) {
ef5ddb2f	129	static char git_dir[PATH_MAX+1];
6adcca3f	130	is_bare_repository_cfg = 1;
9277d602	131	setenv(GIT_DIR_ENVIRONMENT, getcwd(git_dir, sizeof(git_dir)), 0);
4394efec ML	132	if (envchanged)
4394efec ML	133	*envchanged = 1;
8b1fa778 AR	134	} else if (!strcmp(cmd, "-c")) {
	135	if (*argc < 2) {
	136	fprintf(stderr, "-c expects a configuration string\n" );
	137	usage(git_usage_string);
	138	}
	139	git_config_parse_parameter((*argv)[1]);
	140	(*argv)++;
	141	(*argc)--;
6acbcb92 JS	142	} else {
6acbcb92 JS	143	fprintf(stderr, "Unknown option: %s\n", cmd);
822a7d50	144	usage(git_usage_string);
6acbcb92	145	}
4ab243a9 JS	146
	147	(*argv)++;
	148	(*argc)--;
	149	handled++;
	150	}
	151	return handled;
	152	}
	153
2b11e317 JS	154	static int handle_alias(int argcp, const char **argv)
2b11e317 JS	155	{
af05d679	156	int envchanged = 0, ret = 0, saved_errno = errno;
2b11e317	157	const char *subdir;
0347a8c7	158	int count, option_count;
4b25d091	159	const char **new_argv;
94351118 JK	160	const char *alias_command;
94351118 JK	161	char *alias_string;
e85dc0a3	162	int unused_nongit;
2b11e317	163
e85dc0a3	164	subdir = setup_git_directory_gently(&unused_nongit);
0347a8c7 ML	165
0347a8c7 ML	166	alias_command = (*argv)[0];
94351118	167	alias_string = alias_lookup(alias_command);
0347a8c7	168	if (alias_string) {
dfd42a3c	169	if (alias_string[0] == '!') {
030149a4	170	commit_pager_choice();
a2f8028d	171	if (*argcp > 1) {
7a33bcbe	172	struct strbuf buf;
a2f8028d	173
7a33bcbe PH	174	strbuf_init(&buf, PATH_MAX);
7a33bcbe PH	175	strbuf_addstr(&buf, alias_string);
b319ce4c	176	sq_quote_argv(&buf, (*argv) + 1, PATH_MAX);
a2f8028d	177	free(alias_string);
7a33bcbe	178	alias_string = buf.buf;
a2f8028d	179	}
dfd42a3c TT	180	trace_printf("trace: alias to shell cmd: %s => %s\n",
	181	alias_command, alias_string + 1);
	182	ret = system(alias_string + 1);
	183	if (ret >= 0 && WIFEXITED(ret) &&
	184	WEXITSTATUS(ret) != 127)
	185	exit(WEXITSTATUS(ret));
d7530708	186	die("Failed to run '%s' when expanding alias '%s'",
dfd42a3c TT	187	alias_string + 1, alias_command);
dfd42a3c TT	188	}
0347a8c7	189	count = split_cmdline(alias_string, &new_argv);
dc4179f9 DM	190	if (count < 0)
dc4179f9 DM	191	die("Bad alias.%s string", alias_command);
4394efec ML	192	option_count = handle_options(&new_argv, &count, &envchanged);
	193	if (envchanged)
	194	die("alias '%s' changes environment variables\n"
	195	"You can use '!git' in the alias to do this.",
	196	alias_command);
0347a8c7 ML	197	memmove(new_argv - option_count, new_argv,
	198	count * sizeof(char *));
	199	new_argv -= option_count;
	200
	201	if (count < 1)
	202	die("empty alias for %s", alias_command);
	203
	204	if (!strcmp(alias_command, new_argv[0]))
	205	die("recursive alias: %s", alias_command);
	206
b319ce4c	207	trace_argv_printf(new_argv,
6ce4e61f CC	208	"trace: alias expansion: %s =>",
6ce4e61f CC	209	alias_command);
575ba9d6	210
4b25d091	211	new_argv = xrealloc(new_argv, sizeof(char )
6167c136	212	(count + *argcp));
0347a8c7	213	/* insert after command name */
4b25d091	214	memcpy(new_argv + count, argv + 1, sizeof(char ) * *argcp);
2b11e317	215
0347a8c7 ML	216	*argv = new_argv;
0347a8c7 ML	217	*argcp += count - 1;
2b11e317	218
0347a8c7	219	ret = 1;
2b11e317 JS	220	}
2b11e317 JS	221
7be77de2	222	if (subdir && chdir(subdir))
d824cbba	223	die_errno("Cannot change to '%s'", subdir);
2b11e317	224
47e5c0ca JS	225	errno = saved_errno;
47e5c0ca JS	226
2b11e317 JS	227	return ret;
	228	}
	229
70827b15	230	const char git_version_string[] = GIT_VERSION;
5b84f4d8	231
efffea03 JH	232	#define RUN_SETUP (1<<0)
efffea03 JH	233	#define USE_PAGER (1<<1)
7eff28a9 SP	234	/*
	235	* require working tree to be present -- anything uses this needs
	236	* RUN_SETUP for reading from the configuration file.
	237	*/
7ae3df8c	238	#define NEED_WORK_TREE (1<<2)
a633fca0	239
47d0b4ff LT	240	struct cmd_struct {
	241	const char *cmd;
	242	int (fn)(int, const char , const char );
	243	int option;
	244	};
	245
f172f334	246	static int run_builtin(struct cmd_struct p, int argc, const char *argv)
47d0b4ff	247	{
99caeed0	248	int status, help;
0f157315	249	struct stat st;
47d0b4ff LT	250	const char *prefix;
	251
	252	prefix = NULL;
99caeed0 JN	253	help = argc == 2 && !strcmp(argv[1], "-h");
	254	if (!help) {
	255	if (p->option & RUN_SETUP)
	256	prefix = setup_git_directory();
	257
	258	if (use_pager == -1 && p->option & RUN_SETUP)
	259	use_pager = check_pager_config(p->cmd);
	260	if (use_pager == -1 && p->option & USE_PAGER)
	261	use_pager = 1;
	262	}
4e10738a JK	263	commit_pager_choice();
4e10738a JK	264
99caeed0	265	if (!help && p->option & NEED_WORK_TREE)
59f0f2f3 MH	266	setup_work_tree();
59f0f2f3 MH	267
b319ce4c	268	trace_argv_printf(argv, "trace: built-in: git");
47d0b4ff	269
0f157315 LT	270	status = p->fn(argc, argv, prefix);
0f157315 LT	271	if (status)
47e3de0e	272	return status;
0f157315 LT	273
	274	/* Somebody closed stdout? */
	275	if (fstat(fileno(stdout), &st))
	276	return 0;
	277	/* Ignore write errors for pipes and sockets.. */
	278	if (S_ISFIFO(st.st_mode) \|\| S_ISSOCK(st.st_mode))
	279	return 0;
	280
	281	/* Check for ENOSPC and EIO errors.. */
0227f988	282	if (fflush(stdout))
d824cbba	283	die_errno("write failure on standard output");
0227f988 LT	284	if (ferror(stdout))
	285	die("unknown write failure on standard output");
	286	if (fclose(stdout))
d824cbba	287	die_errno("close failed on standard output");
0f157315	288	return 0;
47d0b4ff LT	289	}
	290
	291	static void handle_internal_command(int argc, const char **argv)
231af832 LT	292	{
231af832 LT	293	const char *cmd = argv[0];
47d0b4ff	294	static struct cmd_struct commands[] = {
7ae3df8c	295	{ "add", cmd_add, RUN_SETUP \| NEED_WORK_TREE },
11920d28	296	{ "stage", cmd_add, RUN_SETUP \| NEED_WORK_TREE },
d97bc5de	297	{ "annotate", cmd_annotate, RUN_SETUP },
f754fa9c	298	{ "apply", cmd_apply },
265d5280	299	{ "archive", cmd_archive },
1bf072e3	300	{ "bisect--helper", cmd_bisect__helper, RUN_SETUP \| NEED_WORK_TREE },
4f0219a4	301	{ "blame", cmd_blame, RUN_SETUP },
1da1b3a3	302	{ "branch", cmd_branch, RUN_SETUP },
2e0afafe	303	{ "bundle", cmd_bundle },
efffea03	304	{ "cat-file", cmd_cat_file, RUN_SETUP },
782c2d65	305	{ "checkout", cmd_checkout, RUN_SETUP \| NEED_WORK_TREE },
4465f410 JS	306	{ "checkout-index", cmd_checkout_index,
4465f410 JS	307	RUN_SETUP \| NEED_WORK_TREE},
0864f264	308	{ "check-ref-format", cmd_check_ref_format },
2d35d556	309	{ "check-attr", cmd_check_attr, RUN_SETUP },
e827633a	310	{ "cherry", cmd_cherry, RUN_SETUP },
7ae3df8c	311	{ "cherry-pick", cmd_cherry_pick, RUN_SETUP \| NEED_WORK_TREE },
8434c2f1	312	{ "clone", cmd_clone },
113f10f2	313	{ "clean", cmd_clean, RUN_SETUP \| NEED_WORK_TREE },
f5bbc322	314	{ "commit", cmd_commit, RUN_SETUP \| NEED_WORK_TREE },
efffea03	315	{ "commit-tree", cmd_commit_tree, RUN_SETUP },
e0d10e1c	316	{ "config", cmd_config },
8112894d	317	{ "count-objects", cmd_count_objects, RUN_SETUP },
9a0eaf83	318	{ "describe", cmd_describe, RUN_SETUP },
89d07f75	319	{ "diff", cmd_diff },
4f38f6b5	320	{ "diff-files", cmd_diff_files, RUN_SETUP \| NEED_WORK_TREE },
efffea03	321	{ "diff-index", cmd_diff_index, RUN_SETUP },
efffea03	322	{ "diff-tree", cmd_diff_tree, RUN_SETUP },
f2dc849e	323	{ "fast-export", cmd_fast_export, RUN_SETUP },
b888d61c	324	{ "fetch", cmd_fetch, RUN_SETUP },
2d4177c0	325	{ "fetch-pack", cmd_fetch_pack, RUN_SETUP },
efffea03	326	{ "fmt-merge-msg", cmd_fmt_merge_msg, RUN_SETUP },
9f613ddd	327	{ "for-each-ref", cmd_for_each_ref, RUN_SETUP },
efffea03	328	{ "format-patch", cmd_format_patch, RUN_SETUP },
b4dfefe0 MW	329	{ "fsck", cmd_fsck, RUN_SETUP },
b4dfefe0 MW	330	{ "fsck-objects", cmd_fsck, RUN_SETUP },
6757ada4	331	{ "gc", cmd_gc, RUN_SETUP },
f754fa9c	332	{ "get-tar-commit-id", cmd_get_tar_commit_id },
678e484b	333	{ "grep", cmd_grep },
b28a1ce0	334	{ "hash-object", cmd_hash_object },
f754fa9c	335	{ "help", cmd_help },
3bb72562	336	{ "index-pack", cmd_index_pack },
515377ea	337	{ "init", cmd_init_db },
f754fa9c	338	{ "init-db", cmd_init_db },
efffea03 JH	339	{ "log", cmd_log, RUN_SETUP \| USE_PAGER },
	340	{ "ls-files", cmd_ls_files, RUN_SETUP },
	341	{ "ls-tree", cmd_ls_tree, RUN_SETUP },
8951d7c1	342	{ "ls-remote", cmd_ls_remote },
f754fa9c JH	343	{ "mailinfo", cmd_mailinfo },
f754fa9c JH	344	{ "mailsplit", cmd_mailsplit },
1c7b76be	345	{ "merge", cmd_merge, RUN_SETUP \| NEED_WORK_TREE },
71dfbf22	346	{ "merge-base", cmd_merge_base, RUN_SETUP },
ba1f5f35	347	{ "merge-file", cmd_merge_file },
0ecace72	348	{ "merge-index", cmd_merge_index, RUN_SETUP },
a00a42ae	349	{ "merge-ours", cmd_merge_ours, RUN_SETUP },
e1b3a2ca	350	{ "merge-recursive", cmd_merge_recursive, RUN_SETUP \| NEED_WORK_TREE },
8cc5b290 AP	351	{ "merge-recursive-ours", cmd_merge_recursive, RUN_SETUP \| NEED_WORK_TREE },
8cc5b290 AP	352	{ "merge-recursive-theirs", cmd_merge_recursive, RUN_SETUP \| NEED_WORK_TREE },
1736855c	353	{ "merge-subtree", cmd_merge_recursive, RUN_SETUP \| NEED_WORK_TREE },
907a7cb5	354	{ "merge-tree", cmd_merge_tree, RUN_SETUP },
112dd514	355	{ "mktag", cmd_mktag, RUN_SETUP },
633e3556	356	{ "mktree", cmd_mktree, RUN_SETUP },
7ae3df8c	357	{ "mv", cmd_mv, RUN_SETUP \| NEED_WORK_TREE },
efffea03	358	{ "name-rev", cmd_name_rev, RUN_SETUP },
cd067d3b	359	{ "notes", cmd_notes, RUN_SETUP },
efffea03	360	{ "pack-objects", cmd_pack_objects, RUN_SETUP },
377d0276	361	{ "pack-redundant", cmd_pack_redundant, RUN_SETUP },
dedc0ec5	362	{ "patch-id", cmd_patch_id },
8951d7c1	363	{ "peek-remote", cmd_ls_remote },
d97bc5de	364	{ "pickaxe", cmd_blame, RUN_SETUP },
efffea03 JH	365	{ "prune", cmd_prune, RUN_SETUP },
efffea03 JH	366	{ "prune-packed", cmd_prune_packed, RUN_SETUP },
102cb085	367	{ "push", cmd_push, RUN_SETUP },
efffea03	368	{ "read-tree", cmd_read_tree, RUN_SETUP },
be5908ae	369	{ "receive-pack", cmd_receive_pack },
4264dc15	370	{ "reflog", cmd_reflog, RUN_SETUP },
211c8968	371	{ "remote", cmd_remote, RUN_SETUP },
54b0c1e0	372	{ "replace", cmd_replace, RUN_SETUP },
e0d10e1c	373	{ "repo-config", cmd_config },
658f3650	374	{ "rerere", cmd_rerere, RUN_SETUP },
0e5a7faa	375	{ "reset", cmd_reset, RUN_SETUP },
efffea03	376	{ "rev-list", cmd_rev_list, RUN_SETUP },
5410a02a	377	{ "rev-parse", cmd_rev_parse },
7ae3df8c	378	{ "revert", cmd_revert, RUN_SETUP \| NEED_WORK_TREE },
271bb087	379	{ "rm", cmd_rm, RUN_SETUP },
96249c04	380	{ "send-pack", cmd_send_pack, RUN_SETUP },
abe549e1	381	{ "shortlog", cmd_shortlog, USE_PAGER },
efffea03 JH	382	{ "show-branch", cmd_show_branch, RUN_SETUP },
efffea03 JH	383	{ "show", cmd_show, RUN_SETUP \| USE_PAGER },
10762323	384	{ "status", cmd_status, RUN_SETUP \| NEED_WORK_TREE },
f754fa9c	385	{ "stripspace", cmd_stripspace },
efffea03	386	{ "symbolic-ref", cmd_symbolic_ref, RUN_SETUP },
62e09ce9	387	{ "tag", cmd_tag, RUN_SETUP },
9cb90b80	388	{ "tar-tree", cmd_tar_tree },
b5325818	389	{ "unpack-file", cmd_unpack_file, RUN_SETUP },
efffea03 JH	390	{ "unpack-objects", cmd_unpack_objects, RUN_SETUP },
	391	{ "update-index", cmd_update_index, RUN_SETUP },
	392	{ "update-ref", cmd_update_ref, RUN_SETUP },
53a1116c	393	{ "update-server-info", cmd_update_server_info, RUN_SETUP },
39345a21	394	{ "upload-archive", cmd_upload_archive },
55b6745d	395	{ "var", cmd_var },
2ae68fcb	396	{ "verify-tag", cmd_verify_tag, RUN_SETUP },
f754fa9c	397	{ "version", cmd_version },
efffea03 JH	398	{ "whatchanged", cmd_whatchanged, RUN_SETUP \| USE_PAGER },
efffea03 JH	399	{ "write-tree", cmd_write_tree, RUN_SETUP },
2e3ed670	400	{ "verify-pack", cmd_verify_pack },
358ddb62	401	{ "show-ref", cmd_show_ref, RUN_SETUP },
e1e22e37	402	{ "pack-refs", cmd_pack_refs, RUN_SETUP },
231af832 LT	403	};
231af832 LT	404	int i;
23326d14 JS	405	static const char ext[] = STRIP_EXTENSION;
	406
	407	if (sizeof(ext) > 1) {
	408	i = strlen(argv[0]) - strlen(ext);
	409	if (i > 0 && !strcmp(argv[0] + i, ext)) {
e8eec71d	410	char *argv0 = xstrdup(argv[0]);
23326d14 JS	411	argv[0] = cmd = argv0;
	412	argv0[i] = '\0';
	413	}
	414	}
231af832	415
1cd95087 LT	416	/* Turn "git cmd --help" into "git help cmd" */
	417	if (argc > 1 && !strcmp(argv[1], "--help")) {
	418	argv[1] = argv[0];
	419	argv[0] = cmd = "help";
	420	}
	421
231af832 LT	422	for (i = 0; i < ARRAY_SIZE(commands); i++) {
	423	struct cmd_struct *p = commands+i;
	424	if (strcmp(p->cmd, cmd))
	425	continue;
f172f334	426	exit(run_builtin(p, argc, argv));
231af832 LT	427	}
	428	}
	429
7550be0a JH	430	static void execv_dashed_external(const char **argv)
7550be0a JH	431	{
f285a2d7	432	struct strbuf cmd = STRBUF_INIT;
7550be0a	433	const char *tmp;
d8e96fd8	434	int status;
7550be0a	435
030149a4 JN	436	commit_pager_choice();
030149a4 JN	437
7550be0a JH	438	strbuf_addf(&cmd, "git-%s", argv[0]);
	439
	440	/*
	441	* argv[0] must be the git command, but the argv array
	442	* belongs to the caller, and may be reused in
	443	* subsequent loop iterations. Save argv[0] and
	444	* restore it on error.
	445	*/
	446	tmp = argv[0];
	447	argv[0] = cmd.buf;
	448
	449	trace_argv_printf(argv, "trace: exec:");
	450
d8e96fd8 JK	451	/*
	452	* if we fail because the command is not found, it is
	453	* OK to return. Otherwise, we just pass along the status code.
	454	*/
c024beb5	455	status = run_command_v_opt(argv, RUN_SILENT_EXEC_FAILURE);
0ac77ec3	456	if (status >= 0 \|\| errno != ENOENT)
5709e036	457	exit(status);
7550be0a JH	458
	459	argv[0] = tmp;
	460
	461	strbuf_release(&cmd);
	462	}
	463
a907e1b6 AS	464	static int run_argv(int argcp, const char **argv)
	465	{
	466	int done_alias = 0;
	467
	468	while (1) {
	469	/* See if it's an internal command */
	470	handle_internal_command(argcp, argv);
	471
	472	/* .. then try the external ones */
	473	execv_dashed_external(*argv);
	474
	475	/* It could be an alias -- this works around the insanity
	476	* of overriding "git log" with "git show" by having
	477	* alias.log = show
	478	*/
	479	if (done_alias \|\| !handle_alias(argcp, argv))
	480	break;
	481	done_alias = 1;
	482	}
	483
	484	return done_alias;
	485	}
	486
7550be0a	487
47d0b4ff	488	int main(int argc, const char **argv)
8e49d503	489	{
4dd47c3b	490	const char *cmd;
231af832	491
2cd72b0b SP	492	cmd = git_extract_argv0_path(argv[0]);
2cd72b0b SP	493	if (!cmd)
4dd47c3b	494	cmd = "git-help";
8e49d503	495
231af832 LT	496	/*
	497	* "git-xxxx" is the same as "git xxxx", but we obviously:
	498	*
	499	* - cannot take flags in between the "git" and the "xxxx".
	500	* - cannot execute it externally (since it would just do
	501	* the same thing over again)
	502	*
	503	* So we just directly call the internal command handler, and
	504	* die if that one cannot handle it.
	505	*/
cc44c765	506	if (!prefixcmp(cmd, "git-")) {
231af832 LT	507	cmd += 4;
231af832 LT	508	argv[0] = cmd;
47d0b4ff	509	handle_internal_command(argc, argv);
231af832 LT	510	die("cannot handle %s internally", cmd);
231af832 LT	511	}
8e49d503	512
231af832	513	/* Look for flags.. */
6acbcb92 JS	514	argv++;
6acbcb92 JS	515	argc--;
4394efec	516	handle_options(&argv, &argc, NULL);
6acbcb92	517	if (argc > 0) {
cc44c765	518	if (!prefixcmp(argv[0], "--"))
6acbcb92 JS	519	argv[0] += 2;
6acbcb92 JS	520	} else {
3d7e2d85	521	/* The user didn't specify a command; give them help */
73e25e7c	522	commit_pager_choice();
3d7e2d85 SP	523	printf("usage: %s\n\n", git_usage_string);
3d7e2d85 SP	524	list_common_cmds_help();
b7d96819	525	printf("\n%s\n", git_more_info_string);
3d7e2d85	526	exit(1);
97fc6c5f	527	}
6acbcb92	528	cmd = argv[0];
231af832 LT	529
231af832 LT	530	/*
511707d4	531	* We use PATH to find git commands, but we prepend some higher
3ea3c215	532	* precedence paths: the "--exec-path" option, the GIT_EXEC_PATH
511707d4 SP	533	* environment, and the $(gitexecdir) from the Makefile at build
511707d4 SP	534	* time.
231af832	535	*/
e1464ca7	536	setup_path();
8e49d503	537
a025463b	538	while (1) {
a907e1b6 AS	539	static int done_help = 0;
	540	static int was_alias = 0;
	541	was_alias = run_argv(&argc, &argv);
	542	if (errno != ENOENT)
a025463b	543	break;
a907e1b6	544	if (was_alias) {
f3dd015c	545	fprintf(stderr, "Expansion of alias '%s' failed; "
7283bbc7	546	"'%s' is not a git command\n",
f3dd015c TT	547	cmd, argv[0]);
	548	exit(1);
	549	}
a907e1b6 AS	550	if (!done_help) {
	551	cmd = argv[0] = help_unknown_cmd(cmd);
	552	done_help = 1;
	553	} else
	554	break;
f3dd015c	555	}
10b15b86 AR	556
10b15b86 AR	557	fprintf(stderr, "Failed to run command '%s': %s\n",
33ebb871	558	cmd, strerror(errno));
8e49d503 AE	559
	560	return 1;
	561	}