[thirdparty/git.git] / git.c

#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <dirent.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <limits.h>
#include <stdarg.h>
#include "git-compat-util.h"
#include "exec_cmd.h"
#include "cache.h"
#include "quote.h"

#include "builtin.h"

static void prepend_to_path(const char *dir, int len)
{
	const char *old_path = getenv("PATH");
	char *path;
	int path_len = len;

	if (!old_path)
		old_path = "/usr/local/bin:/usr/bin:/bin";

	path_len = len + strlen(old_path) + 1;

	path = malloc(path_len + 1);

	memcpy(path, dir, len);
	path[len] = ':';
	memcpy(path + len + 1, old_path, path_len - len);

	setenv("PATH", path, 1);
}

static int handle_options(const char*** argv, int* argc)
{
	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 (!strncmp(cmd, "--exec-path", 11)) {
			cmd += 11;
			if (*cmd == '=')
				git_set_exec_path(cmd + 1);
			else {
				puts(git_exec_path());
				exit(0);
			}
		} else if (!strcmp(cmd, "-p") || !strcmp(cmd, "--paginate")) {
			setup_pager();
		} else if (!strcmp(cmd, "--git-dir")) {
			if (*argc < 1)
				return -1;
			setenv("GIT_DIR", (*argv)[1], 1);
			(*argv)++;
			(*argc)--;
		} else if (!strncmp(cmd, "--git-dir=", 10)) {
			setenv("GIT_DIR", cmd + 10, 1);
		} else if (!strcmp(cmd, "--bare")) {
			static char git_dir[1024];
			setenv("GIT_DIR", getcwd(git_dir, 1024), 1);
		} else {
			fprintf(stderr, "Unknown option: %s\n", cmd);
			cmd_usage(0, NULL, NULL);
		}

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

static const char *alias_command;
static char *alias_string = NULL;

static int git_alias_config(const char *var, const char *value)
{
	if (!strncmp(var, "alias.", 6) && !strcmp(var + 6, alias_command)) {
		alias_string = strdup(value);
	}
	return 0;
}

static int split_cmdline(char *cmdline, const char ***argv)
{
	int src, dst, count = 0, size = 16;
	char quoted = 0;

	*argv = malloc(sizeof(char*) * size);

	/* split alias_string */
	(*argv)[count++] = cmdline;
	for (src = dst = 0; cmdline[src];) {
		char c = cmdline[src];
		if (!quoted && isspace(c)) {
			cmdline[dst++] = 0;
			while (cmdline[++src]
					&& isspace(cmdline[src]))
				; /* skip */
			if (count >= size) {
				size += 16;
				*argv = realloc(*argv, sizeof(char*) * size);
			}
			(*argv)[count++] = cmdline + dst;
		} else if(!quoted && (c == '\'' || c == '"')) {
			quoted = c;
			src++;
		} else if (c == quoted) {
			quoted = 0;
			src++;
		} else {
			if (c == '\\' && quoted != '\'') {
				src++;
				c = cmdline[src];
				if (!c) {
					free(*argv);
					*argv = NULL;
					return error("cmdline ends with \\");
				}
			}
			cmdline[dst++] = c;
			src++;
		}
	}

	cmdline[dst] = 0;

	if (quoted) {
		free(*argv);
		*argv = NULL;
		return error("unclosed quote");
	}

	return count;
}

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

	subdir = setup_git_directory_gently(&nongit);

	alias_command = (*argv)[0];
	git_config(git_alias_config);
	if (alias_string) {
		count = split_cmdline(alias_string, &new_argv);
		option_count = handle_options(&new_argv, &count);
		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);

		if (getenv("GIT_TRACE")) {
			int i;
			fprintf(stderr, "trace: alias expansion: %s =>",
				alias_command);
			for (i = 0; i < count; ++i) {
				fputc(' ', stderr);
				sq_quote_print(stderr, new_argv[i]);
			}
			fputc('\n', stderr);
			fflush(stderr);
		}

		new_argv = realloc(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);

	errno = saved_errno;

	return ret;
}

const char git_version_string[] = GIT_VERSION;

#define NEEDS_PREFIX 1

static void handle_internal_command(int argc, const char **argv, char **envp)
{
	const char *cmd = argv[0];
	static struct cmd_struct {
		const char *cmd;
		int (*fn)(int, const char **, const char *);
		int prefix;
	} commands[] = {
		{ "version", cmd_version },
		{ "help", cmd_help },
		{ "log", cmd_log, NEEDS_PREFIX },
		{ "whatchanged", cmd_whatchanged, NEEDS_PREFIX },
		{ "show", cmd_show, NEEDS_PREFIX },
		{ "push", cmd_push },
		{ "format-patch", cmd_format_patch, NEEDS_PREFIX },
		{ "count-objects", cmd_count_objects },
		{ "diff", cmd_diff, NEEDS_PREFIX },
		{ "grep", cmd_grep, NEEDS_PREFIX },
		{ "rm", cmd_rm, NEEDS_PREFIX },
		{ "add", cmd_add, NEEDS_PREFIX },
		{ "rev-list", cmd_rev_list, NEEDS_PREFIX },
		{ "init-db", cmd_init_db },
		{ "get-tar-commit-id", cmd_get_tar_commit_id },
		{ "upload-tar", cmd_upload_tar },
		{ "check-ref-format", cmd_check_ref_format },
		{ "ls-files", cmd_ls_files, NEEDS_PREFIX },
		{ "ls-tree", cmd_ls_tree, NEEDS_PREFIX },
		{ "tar-tree", cmd_tar_tree, NEEDS_PREFIX },
		{ "read-tree", cmd_read_tree, NEEDS_PREFIX },
		{ "commit-tree", cmd_commit_tree, NEEDS_PREFIX },
		{ "apply", cmd_apply },
		{ "show-branch", cmd_show_branch, NEEDS_PREFIX },
		{ "diff-files", cmd_diff_files, NEEDS_PREFIX },
		{ "diff-index", cmd_diff_index, NEEDS_PREFIX },
		{ "diff-stages", cmd_diff_stages, NEEDS_PREFIX },
		{ "diff-tree", cmd_diff_tree, NEEDS_PREFIX },
		{ "cat-file", cmd_cat_file, NEEDS_PREFIX },
		{ "rev-parse", cmd_rev_parse, NEEDS_PREFIX },
		{ "write-tree", cmd_write_tree, NEEDS_PREFIX },
		{ "mailsplit", cmd_mailsplit },
		{ "mailinfo", cmd_mailinfo },
		{ "stripspace", cmd_stripspace },
		{ "update-index", cmd_update_index, NEEDS_PREFIX },
		{ "update-ref", cmd_update_ref, NEEDS_PREFIX },
		{ "fmt-merge-msg", cmd_fmt_merge_msg, NEEDS_PREFIX },
		{ "prune", cmd_prune, NEEDS_PREFIX },
		{ "mv", cmd_mv, NEEDS_PREFIX },
	};
	int i;

	/* 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;
		const char *prefix;
		if (strcmp(p->cmd, cmd))
			continue;

		prefix = NULL;
		if (p->prefix)
			prefix = setup_git_directory();
		if (getenv("GIT_TRACE")) {
			int i;
			fprintf(stderr, "trace: built-in: git");
			for (i = 0; i < argc; ++i) {
				fputc(' ', stderr);
				sq_quote_print(stderr, argv[i]);
			}
			putc('\n', stderr);
			fflush(stderr);
		}

		exit(p->fn(argc, argv, prefix));
	}
}

int main(int argc, const char **argv, char **envp)
{
	const char *cmd = argv[0];
	char *slash = strrchr(cmd, '/');
	const char *exec_path = NULL;
	int done_alias = 0;

	/*
	 * Take the basename of argv[0] as the command
	 * name, and the dirname as the default exec_path
	 * if it's an absolute path and we don't have
	 * anything better.
	 */
	if (slash) {
		*slash++ = 0;
		if (*cmd == '/')
			exec_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 (!strncmp(cmd, "git-", 4)) {
		cmd += 4;
		argv[0] = cmd;
		handle_internal_command(argc, argv, envp);
		die("cannot handle %s internally", cmd);
	}

	/* Look for flags.. */
	argv++;
	argc--;
	handle_options(&argv, &argc);
	if (argc > 0) {
		if (!strncmp(argv[0], "--", 2))
			argv[0] += 2;
	} else {
		/* Default command: "help" */
		argv[0] = "help";
		argc = 1;
	}
	cmd = argv[0];

	/*
	 * We search for git commands in the following order:
	 *  - git_exec_path()
	 *  - the path of the "git" command if we could find it
	 *    in $0
	 *  - the regular PATH.
	 */
	if (exec_path)
		prepend_to_path(exec_path, strlen(exec_path));
	exec_path = git_exec_path();
	prepend_to_path(exec_path, strlen(exec_path));

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

		/* .. then try the external ones */
		execv_git_cmd(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(&argc, &argv))
			break;
		done_alias = 1;
	}

	if (errno == ENOENT)
		cmd_usage(0, exec_path, "'%s' is not a git-command", cmd);

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

	return 1;
}
Commit	Line	Data
8e49d503	1	#include <stdio.h>
7dbc2c04 JH	2	#include <sys/types.h>
	3	#include <sys/stat.h>
	4	#include <dirent.h>
8e49d503 AE	5	#include <unistd.h>
	6	#include <stdlib.h>
	7	#include <string.h>
	8	#include <errno.h>
	9	#include <limits.h>
	10	#include <stdarg.h>
4050c0df	11	#include "git-compat-util.h"
77cb17e9	12	#include "exec_cmd.h"
2b11e317	13	#include "cache.h"
575ba9d6	14	#include "quote.h"
8e49d503	15
70827b15	16	#include "builtin.h"
8e49d503 AE	17
	18	static void prepend_to_path(const char *dir, int len)
	19	{
554fe20d TH	20	const char *old_path = getenv("PATH");
554fe20d TH	21	char *path;
8e49d503 AE	22	int path_len = len;
	23
	24	if (!old_path)
7dbc2c04	25	old_path = "/usr/local/bin:/usr/bin:/bin";
8e49d503 AE	26
	27	path_len = len + strlen(old_path) + 1;
	28
	29	path = malloc(path_len + 1);
8e49d503 AE	30
	31	memcpy(path, dir, len);
	32	path[len] = ':';
	33	memcpy(path + len + 1, old_path, path_len - len);
	34
	35	setenv("PATH", path, 1);
	36	}
	37
4ab243a9 JS	38	static int handle_options(const char*** argv, int* argc)
	39	{
	40	int handled = 0;
	41
	42	while (*argc > 0) {
	43	const char cmd = (argv)[0];
	44	if (cmd[0] != '-')
	45	break;
	46
6acbcb92 JS	47	/*
	48	* For legacy reasons, the "version" and "help"
	49	* commands can be written with "--" prepended
	50	* to make them look like flags.
	51	*/
	52	if (!strcmp(cmd, "--help") \|\| !strcmp(cmd, "--version"))
	53	break;
	54
	55	/*
	56	* Check remaining flags.
	57	*/
	58	if (!strncmp(cmd, "--exec-path", 11)) {
	59	cmd += 11;
	60	if (*cmd == '=')
	61	git_set_exec_path(cmd + 1);
	62	else {
	63	puts(git_exec_path());
	64	exit(0);
	65	}
	66	} else if (!strcmp(cmd, "-p") \|\| !strcmp(cmd, "--paginate")) {
4ab243a9	67	setup_pager();
6acbcb92 JS	68	} else if (!strcmp(cmd, "--git-dir")) {
	69	if (*argc < 1)
	70	return -1;
	71	setenv("GIT_DIR", (*argv)[1], 1);
	72	(*argv)++;
	73	(*argc)--;
	74	} else if (!strncmp(cmd, "--git-dir=", 10)) {
	75	setenv("GIT_DIR", cmd + 10, 1);
	76	} else if (!strcmp(cmd, "--bare")) {
	77	static char git_dir[1024];
	78	setenv("GIT_DIR", getcwd(git_dir, 1024), 1);
	79	} else {
	80	fprintf(stderr, "Unknown option: %s\n", cmd);
	81	cmd_usage(0, NULL, NULL);
	82	}
4ab243a9 JS	83
	84	(*argv)++;
	85	(*argc)--;
	86	handled++;
	87	}
	88	return handled;
	89	}
	90
2b11e317 JS	91	static const char *alias_command;
	92	static char *alias_string = NULL;
	93
	94	static int git_alias_config(const char var, const char value)
	95	{
	96	if (!strncmp(var, "alias.", 6) && !strcmp(var + 6, alias_command)) {
	97	alias_string = strdup(value);
	98	}
	99	return 0;
	100	}
	101
	102	static int split_cmdline(char cmdline, const char **argv)
	103	{
	104	int src, dst, count = 0, size = 16;
	105	char quoted = 0;
	106
	107	argv = malloc(sizeof(char) * size);
	108
	109	/* split alias_string */
	110	(*argv)[count++] = cmdline;
	111	for (src = dst = 0; cmdline[src];) {
	112	char c = cmdline[src];
	113	if (!quoted && isspace(c)) {
	114	cmdline[dst++] = 0;
	115	while (cmdline[++src]
	116	&& isspace(cmdline[src]))
	117	; /* skip */
	118	if (count >= size) {
	119	size += 16;
	120	argv = realloc(argv, sizeof(char) size);
	121	}
	122	(*argv)[count++] = cmdline + dst;
	123	} else if(!quoted && (c == '\'' \|\| c == '"')) {
	124	quoted = c;
	125	src++;
	126	} else if (c == quoted) {
	127	quoted = 0;
	128	src++;
	129	} else {
	130	if (c == '\\' && quoted != '\'') {
	131	src++;
	132	c = cmdline[src];
	133	if (!c) {
	134	free(*argv);
	135	*argv = NULL;
	136	return error("cmdline ends with \\");
	137	}
	138	}
	139	cmdline[dst++] = c;
	140	src++;
	141	}
	142	}
	143
	144	cmdline[dst] = 0;
	145
	146	if (quoted) {
	147	free(*argv);
	148	*argv = NULL;
	149	return error("unclosed quote");
	150	}
	151
	152	return count;
	153	}
	154
155	static int handle_alias(int argcp, const char **argv)
156	{
47e5c0ca	157	int nongit = 0, ret = 0, saved_errno = errno;
2b11e317	158	const char *subdir;
0347a8c7 ML	159	int count, option_count;
0347a8c7 ML	160	const char** new_argv;
2b11e317 JS	161
2b11e317 JS	162	subdir = setup_git_directory_gently(&nongit);
0347a8c7 ML	163
	164	alias_command = (*argv)[0];
	165	git_config(git_alias_config);
	166	if (alias_string) {
	167	count = split_cmdline(alias_string, &new_argv);
	168	option_count = handle_options(&new_argv, &count);
	169	memmove(new_argv - option_count, new_argv,
	170	count * sizeof(char *));
	171	new_argv -= option_count;
	172
	173	if (count < 1)
	174	die("empty alias for %s", alias_command);
	175
	176	if (!strcmp(alias_command, new_argv[0]))
	177	die("recursive alias: %s", alias_command);
	178
	179	if (getenv("GIT_TRACE")) {
	180	int i;
	181	fprintf(stderr, "trace: alias expansion: %s =>",
	182	alias_command);
	183	for (i = 0; i < count; ++i) {
	184	fputc(' ', stderr);
	185	sq_quote_print(stderr, new_argv[i]);
575ba9d6	186	}
0347a8c7 ML	187	fputc('\n', stderr);
	188	fflush(stderr);
	189	}
575ba9d6	190
0347a8c7 ML	191	new_argv = realloc(new_argv, sizeof(char)
	192	(count + *argcp + 1));
	193	/* insert after command name */
	194	memcpy(new_argv + count, argv + 1, sizeof(char) * *argcp);
	195	new_argv[count+*argcp] = NULL;
2b11e317	196
0347a8c7 ML	197	*argv = new_argv;
0347a8c7 ML	198	*argcp += count - 1;
2b11e317	199
0347a8c7	200	ret = 1;
2b11e317 JS	201	}
	202
	203	if (subdir)
	204	chdir(subdir);
	205
47e5c0ca JS	206	errno = saved_errno;
47e5c0ca JS	207
2b11e317 JS	208	return ret;
	209	}
	210
70827b15	211	const char git_version_string[] = GIT_VERSION;
5b84f4d8	212
a633fca0 LT	213	#define NEEDS_PREFIX 1
a633fca0 LT	214
9201c707	215	static void handle_internal_command(int argc, const char argv, char envp)
231af832 LT	216	{
	217	const char *cmd = argv[0];
	218	static struct cmd_struct {
	219	const char *cmd;
a633fca0 LT	220	int (fn)(int, const char , const char );
a633fca0 LT	221	int prefix;
231af832 LT	222	} commands[] = {
	223	{ "version", cmd_version },
	224	{ "help", cmd_help },
a633fca0 LT	225	{ "log", cmd_log, NEEDS_PREFIX },
	226	{ "whatchanged", cmd_whatchanged, NEEDS_PREFIX },
	227	{ "show", cmd_show, NEEDS_PREFIX },
755225de	228	{ "push", cmd_push },
a633fca0	229	{ "format-patch", cmd_format_patch, NEEDS_PREFIX },
c7432087	230	{ "count-objects", cmd_count_objects },
a633fca0 LT	231	{ "diff", cmd_diff, NEEDS_PREFIX },
	232	{ "grep", cmd_grep, NEEDS_PREFIX },
	233	{ "rm", cmd_rm, NEEDS_PREFIX },
	234	{ "add", cmd_add, NEEDS_PREFIX },
	235	{ "rev-list", cmd_rev_list, NEEDS_PREFIX },
c3c8835f	236	{ "init-db", cmd_init_db },
52ba03cb	237	{ "get-tar-commit-id", cmd_get_tar_commit_id },
21754264	238	{ "upload-tar", cmd_upload_tar },
0864f264	239	{ "check-ref-format", cmd_check_ref_format },
a633fca0 LT	240	{ "ls-files", cmd_ls_files, NEEDS_PREFIX },
	241	{ "ls-tree", cmd_ls_tree, NEEDS_PREFIX },
	242	{ "tar-tree", cmd_tar_tree, NEEDS_PREFIX },
	243	{ "read-tree", cmd_read_tree, NEEDS_PREFIX },
	244	{ "commit-tree", cmd_commit_tree, NEEDS_PREFIX },
51ce34b9	245	{ "apply", cmd_apply },
a633fca0 LT	246	{ "show-branch", cmd_show_branch, NEEDS_PREFIX },
	247	{ "diff-files", cmd_diff_files, NEEDS_PREFIX },
	248	{ "diff-index", cmd_diff_index, NEEDS_PREFIX },
	249	{ "diff-stages", cmd_diff_stages, NEEDS_PREFIX },
	250	{ "diff-tree", cmd_diff_tree, NEEDS_PREFIX },
	251	{ "cat-file", cmd_cat_file, NEEDS_PREFIX },
	252	{ "rev-parse", cmd_rev_parse, NEEDS_PREFIX },
	253	{ "write-tree", cmd_write_tree, NEEDS_PREFIX },
34488e3c	254	{ "mailsplit", cmd_mailsplit },
7499c996	255	{ "mailinfo", cmd_mailinfo },
fefe81c9	256	{ "stripspace", cmd_stripspace },
a633fca0 LT	257	{ "update-index", cmd_update_index, NEEDS_PREFIX },
	258	{ "update-ref", cmd_update_ref, NEEDS_PREFIX },
	259	{ "fmt-merge-msg", cmd_fmt_merge_msg, NEEDS_PREFIX },
	260	{ "prune", cmd_prune, NEEDS_PREFIX },
7061cf0f	261	{ "mv", cmd_mv, NEEDS_PREFIX },
231af832 LT	262	};
	263	int i;
	264
1cd95087 LT	265	/* Turn "git cmd --help" into "git help cmd" */
	266	if (argc > 1 && !strcmp(argv[1], "--help")) {
	267	argv[1] = argv[0];
	268	argv[0] = cmd = "help";
	269	}
	270
231af832 LT	271	for (i = 0; i < ARRAY_SIZE(commands); i++) {
231af832 LT	272	struct cmd_struct *p = commands+i;
a633fca0	273	const char *prefix;
231af832 LT	274	if (strcmp(p->cmd, cmd))
231af832 LT	275	continue;
575ba9d6	276
a633fca0 LT	277	prefix = NULL;
	278	if (p->prefix)
	279	prefix = setup_git_directory();
575ba9d6 ML	280	if (getenv("GIT_TRACE")) {
	281	int i;
	282	fprintf(stderr, "trace: built-in: git");
	283	for (i = 0; i < argc; ++i) {
	284	fputc(' ', stderr);
	285	sq_quote_print(stderr, argv[i]);
	286	}
	287	putc('\n', stderr);
	288	fflush(stderr);
	289	}
	290
a633fca0	291	exit(p->fn(argc, argv, prefix));
231af832 LT	292	}
	293	}
	294
9201c707	295	int main(int argc, const char argv, char envp)
8e49d503	296	{
9201c707	297	const char *cmd = argv[0];
231af832	298	char *slash = strrchr(cmd, '/');
231af832	299	const char *exec_path = NULL;
a025463b	300	int done_alias = 0;
231af832 LT	301
	302	/*
	303	* Take the basename of argv[0] as the command
	304	* name, and the dirname as the default exec_path
	305	* if it's an absolute path and we don't have
	306	* anything better.
	307	*/
	308	if (slash) {
	309	*slash++ = 0;
	310	if (*cmd == '/')
	311	exec_path = cmd;
	312	cmd = slash;
	313	}
8e49d503	314
231af832 LT	315	/*
	316	* "git-xxxx" is the same as "git xxxx", but we obviously:
	317	*
	318	* - cannot take flags in between the "git" and the "xxxx".
	319	* - cannot execute it externally (since it would just do
	320	* the same thing over again)
	321	*
	322	* So we just directly call the internal command handler, and
	323	* die if that one cannot handle it.
	324	*/
	325	if (!strncmp(cmd, "git-", 4)) {
	326	cmd += 4;
	327	argv[0] = cmd;
	328	handle_internal_command(argc, argv, envp);
	329	die("cannot handle %s internally", cmd);
	330	}
8e49d503	331
231af832	332	/* Look for flags.. */
6acbcb92 JS	333	argv++;
	334	argc--;
	335	handle_options(&argv, &argc);
	336	if (argc > 0) {
	337	if (!strncmp(argv[0], "--", 2))
	338	argv[0] += 2;
	339	} else {
	340	/* Default command: "help" */
	341	argv[0] = "help";
	342	argc = 1;
97fc6c5f	343	}
6acbcb92	344	cmd = argv[0];
231af832 LT	345
	346	/*
	347	* We search for git commands in the following order:
	348	* - git_exec_path()
	349	* - the path of the "git" command if we could find it
	350	* in $0
	351	* - the regular PATH.
	352	*/
	353	if (exec_path)
	354	prepend_to_path(exec_path, strlen(exec_path));
77cb17e9 MO	355	exec_path = git_exec_path();
77cb17e9 MO	356	prepend_to_path(exec_path, strlen(exec_path));
8e49d503	357
a025463b JH	358	while (1) {
	359	/* See if it's an internal command */
	360	handle_internal_command(argc, argv, envp);
2b11e317	361
a025463b JH	362	/* .. then try the external ones */
a025463b JH	363	execv_git_cmd(argv);
231af832	364
a025463b JH	365	/* It could be an alias -- this works around the insanity
	366	* of overriding "git log" with "git show" by having
	367	* alias.log = show
	368	*/
	369	if (done_alias \|\| !handle_alias(&argc, &argv))
	370	break;
	371	done_alias = 1;
	372	}
10b15b86 AR	373
10b15b86 AR	374	if (errno == ENOENT)
a87cd02c	375	cmd_usage(0, exec_path, "'%s' is not a git-command", cmd);
10b15b86 AR	376
10b15b86 AR	377	fprintf(stderr, "Failed to run command '%s': %s\n",
33ebb871	378	cmd, strerror(errno));
8e49d503 AE	379
	380	return 1;
	381	}