[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"

const char git_usage_string[] =
	"git [--version] [--exec-path[=GIT_EXEC_PATH]] [--help] COMMAND [ ARGS ]";

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);
			usage(git_usage_string);
		}

		(*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
#define USE_PAGER 2

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 option;
	} commands[] = {
		{ "version", cmd_version },
		{ "help", cmd_help },
		{ "log", cmd_log, NEEDS_PREFIX | USE_PAGER },
		{ "whatchanged", cmd_whatchanged, NEEDS_PREFIX | USE_PAGER },
		{ "show", cmd_show, NEEDS_PREFIX | USE_PAGER },
		{ "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 },
		{ "prune-packed", cmd_prune_packed, NEEDS_PREFIX },
		{ "repo-config", cmd_repo_config },
		{ "name-rev", cmd_name_rev, NEEDS_PREFIX },
		{ "pack-objects", cmd_pack_objects, NEEDS_PREFIX },
		{ "unpack-objects", cmd_unpack_objects, 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->option & NEEDS_PREFIX)
			prefix = setup_git_directory();
		if (p->option & USE_PAGER)
			setup_pager();
		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)
		help_unknown_cmd(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	17
822a7d50 RJ	18	const char git_usage_string[] =
	19	"git [--version] [--exec-path[=GIT_EXEC_PATH]] [--help] COMMAND [ ARGS ]";
	20
8e49d503 AE	21	static void prepend_to_path(const char *dir, int len)
8e49d503 AE	22	{
554fe20d TH	23	const char *old_path = getenv("PATH");
554fe20d TH	24	char *path;
8e49d503 AE	25	int path_len = len;
	26
	27	if (!old_path)
7dbc2c04	28	old_path = "/usr/local/bin:/usr/bin:/bin";
8e49d503 AE	29
	30	path_len = len + strlen(old_path) + 1;
	31
	32	path = malloc(path_len + 1);
8e49d503 AE	33
	34	memcpy(path, dir, len);
	35	path[len] = ':';
	36	memcpy(path + len + 1, old_path, path_len - len);
	37
	38	setenv("PATH", path, 1);
	39	}
	40
4ab243a9 JS	41	static int handle_options(const char*** argv, int* argc)
	42	{
	43	int handled = 0;
	44
	45	while (*argc > 0) {
	46	const char cmd = (argv)[0];
	47	if (cmd[0] != '-')
	48	break;
	49
6acbcb92 JS	50	/*
	51	* For legacy reasons, the "version" and "help"
	52	* commands can be written with "--" prepended
	53	* to make them look like flags.
	54	*/
	55	if (!strcmp(cmd, "--help") \|\| !strcmp(cmd, "--version"))
	56	break;
	57
	58	/*
	59	* Check remaining flags.
	60	*/
	61	if (!strncmp(cmd, "--exec-path", 11)) {
	62	cmd += 11;
	63	if (*cmd == '=')
	64	git_set_exec_path(cmd + 1);
	65	else {
	66	puts(git_exec_path());
	67	exit(0);
	68	}
	69	} else if (!strcmp(cmd, "-p") \|\| !strcmp(cmd, "--paginate")) {
4ab243a9	70	setup_pager();
6acbcb92 JS	71	} else if (!strcmp(cmd, "--git-dir")) {
	72	if (*argc < 1)
	73	return -1;
	74	setenv("GIT_DIR", (*argv)[1], 1);
	75	(*argv)++;
	76	(*argc)--;
	77	} else if (!strncmp(cmd, "--git-dir=", 10)) {
	78	setenv("GIT_DIR", cmd + 10, 1);
	79	} else if (!strcmp(cmd, "--bare")) {
	80	static char git_dir[1024];
	81	setenv("GIT_DIR", getcwd(git_dir, 1024), 1);
	82	} else {
	83	fprintf(stderr, "Unknown option: %s\n", cmd);
822a7d50	84	usage(git_usage_string);
6acbcb92	85	}
4ab243a9 JS	86
	87	(*argv)++;
	88	(*argc)--;
	89	handled++;
	90	}
	91	return handled;
	92	}
	93
2b11e317 JS	94	static const char *alias_command;
	95	static char *alias_string = NULL;
	96
	97	static int git_alias_config(const char var, const char value)
	98	{
	99	if (!strncmp(var, "alias.", 6) && !strcmp(var + 6, alias_command)) {
	100	alias_string = strdup(value);
	101	}
	102	return 0;
	103	}
	104
	105	static int split_cmdline(char cmdline, const char **argv)
	106	{
	107	int src, dst, count = 0, size = 16;
	108	char quoted = 0;
	109
	110	argv = malloc(sizeof(char) * size);
	111
	112	/* split alias_string */
	113	(*argv)[count++] = cmdline;
	114	for (src = dst = 0; cmdline[src];) {
	115	char c = cmdline[src];
	116	if (!quoted && isspace(c)) {
	117	cmdline[dst++] = 0;
	118	while (cmdline[++src]
	119	&& isspace(cmdline[src]))
	120	; /* skip */
	121	if (count >= size) {
	122	size += 16;
	123	argv = realloc(argv, sizeof(char) size);
	124	}
	125	(*argv)[count++] = cmdline + dst;
	126	} else if(!quoted && (c == '\'' \|\| c == '"')) {
	127	quoted = c;
	128	src++;
	129	} else if (c == quoted) {
	130	quoted = 0;
	131	src++;
	132	} else {
	133	if (c == '\\' && quoted != '\'') {
	134	src++;
	135	c = cmdline[src];
	136	if (!c) {
	137	free(*argv);
	138	*argv = NULL;
	139	return error("cmdline ends with \\");
	140	}
	141	}
	142	cmdline[dst++] = c;
	143	src++;
	144	}
	145	}
	146
	147	cmdline[dst] = 0;
	148
	149	if (quoted) {
	150	free(*argv);
	151	*argv = NULL;
	152	return error("unclosed quote");
	153	}
	154
	155	return count;
	156	}
	157
158	static int handle_alias(int argcp, const char **argv)
159	{
47e5c0ca	160	int nongit = 0, ret = 0, saved_errno = errno;
2b11e317	161	const char *subdir;
0347a8c7 ML	162	int count, option_count;
0347a8c7 ML	163	const char** new_argv;
2b11e317 JS	164
2b11e317 JS	165	subdir = setup_git_directory_gently(&nongit);
0347a8c7 ML	166
	167	alias_command = (*argv)[0];
	168	git_config(git_alias_config);
	169	if (alias_string) {
	170	count = split_cmdline(alias_string, &new_argv);
	171	option_count = handle_options(&new_argv, &count);
	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
	182	if (getenv("GIT_TRACE")) {
	183	int i;
	184	fprintf(stderr, "trace: alias expansion: %s =>",
	185	alias_command);
	186	for (i = 0; i < count; ++i) {
	187	fputc(' ', stderr);
	188	sq_quote_print(stderr, new_argv[i]);
575ba9d6	189	}
0347a8c7 ML	190	fputc('\n', stderr);
	191	fflush(stderr);
	192	}
575ba9d6	193
0347a8c7 ML	194	new_argv = realloc(new_argv, sizeof(char)
	195	(count + *argcp + 1));
	196	/* insert after command name */
	197	memcpy(new_argv + count, argv + 1, sizeof(char) * *argcp);
	198	new_argv[count+*argcp] = NULL;
2b11e317	199
0347a8c7 ML	200	*argv = new_argv;
0347a8c7 ML	201	*argcp += count - 1;
2b11e317	202
0347a8c7	203	ret = 1;
2b11e317 JS	204	}
	205
	206	if (subdir)
	207	chdir(subdir);
	208
47e5c0ca JS	209	errno = saved_errno;
47e5c0ca JS	210
2b11e317 JS	211	return ret;
	212	}
	213
70827b15	214	const char git_version_string[] = GIT_VERSION;
5b84f4d8	215
a633fca0	216	#define NEEDS_PREFIX 1
9590b041	217	#define USE_PAGER 2
a633fca0	218
9201c707	219	static void handle_internal_command(int argc, const char argv, char envp)
231af832 LT	220	{
	221	const char *cmd = argv[0];
	222	static struct cmd_struct {
	223	const char *cmd;
a633fca0	224	int (fn)(int, const char , const char );
9590b041	225	int option;
231af832 LT	226	} commands[] = {
	227	{ "version", cmd_version },
	228	{ "help", cmd_help },
9590b041 JH	229	{ "log", cmd_log, NEEDS_PREFIX \| USE_PAGER },
	230	{ "whatchanged", cmd_whatchanged, NEEDS_PREFIX \| USE_PAGER },
	231	{ "show", cmd_show, NEEDS_PREFIX \| USE_PAGER },
755225de	232	{ "push", cmd_push },
a633fca0	233	{ "format-patch", cmd_format_patch, NEEDS_PREFIX },
c7432087	234	{ "count-objects", cmd_count_objects },
a633fca0 LT	235	{ "diff", cmd_diff, NEEDS_PREFIX },
	236	{ "grep", cmd_grep, NEEDS_PREFIX },
	237	{ "rm", cmd_rm, NEEDS_PREFIX },
	238	{ "add", cmd_add, NEEDS_PREFIX },
	239	{ "rev-list", cmd_rev_list, NEEDS_PREFIX },
c3c8835f	240	{ "init-db", cmd_init_db },
52ba03cb	241	{ "get-tar-commit-id", cmd_get_tar_commit_id },
21754264	242	{ "upload-tar", cmd_upload_tar },
0864f264	243	{ "check-ref-format", cmd_check_ref_format },
a633fca0 LT	244	{ "ls-files", cmd_ls_files, NEEDS_PREFIX },
	245	{ "ls-tree", cmd_ls_tree, NEEDS_PREFIX },
	246	{ "tar-tree", cmd_tar_tree, NEEDS_PREFIX },
	247	{ "read-tree", cmd_read_tree, NEEDS_PREFIX },
	248	{ "commit-tree", cmd_commit_tree, NEEDS_PREFIX },
51ce34b9	249	{ "apply", cmd_apply },
a633fca0 LT	250	{ "show-branch", cmd_show_branch, NEEDS_PREFIX },
	251	{ "diff-files", cmd_diff_files, NEEDS_PREFIX },
	252	{ "diff-index", cmd_diff_index, NEEDS_PREFIX },
	253	{ "diff-stages", cmd_diff_stages, NEEDS_PREFIX },
	254	{ "diff-tree", cmd_diff_tree, NEEDS_PREFIX },
	255	{ "cat-file", cmd_cat_file, NEEDS_PREFIX },
	256	{ "rev-parse", cmd_rev_parse, NEEDS_PREFIX },
	257	{ "write-tree", cmd_write_tree, NEEDS_PREFIX },
34488e3c	258	{ "mailsplit", cmd_mailsplit },
7499c996	259	{ "mailinfo", cmd_mailinfo },
fefe81c9	260	{ "stripspace", cmd_stripspace },
a633fca0 LT	261	{ "update-index", cmd_update_index, NEEDS_PREFIX },
	262	{ "update-ref", cmd_update_ref, NEEDS_PREFIX },
	263	{ "fmt-merge-msg", cmd_fmt_merge_msg, NEEDS_PREFIX },
	264	{ "prune", cmd_prune, NEEDS_PREFIX },
7061cf0f	265	{ "mv", cmd_mv, NEEDS_PREFIX },
53bb2c00	266	{ "prune-packed", cmd_prune_packed, NEEDS_PREFIX },
e12c095a	267	{ "repo-config", cmd_repo_config },
d6b64ed0	268	{ "name-rev", cmd_name_rev, NEEDS_PREFIX },
5d4a6003	269	{ "pack-objects", cmd_pack_objects, NEEDS_PREFIX },
64413630	270	{ "unpack-objects", cmd_unpack_objects, NEEDS_PREFIX },
231af832 LT	271	};
	272	int i;
	273
1cd95087 LT	274	/* Turn "git cmd --help" into "git help cmd" */
	275	if (argc > 1 && !strcmp(argv[1], "--help")) {
	276	argv[1] = argv[0];
	277	argv[0] = cmd = "help";
	278	}
	279
231af832 LT	280	for (i = 0; i < ARRAY_SIZE(commands); i++) {
231af832 LT	281	struct cmd_struct *p = commands+i;
a633fca0	282	const char *prefix;
231af832 LT	283	if (strcmp(p->cmd, cmd))
231af832 LT	284	continue;
575ba9d6	285
a633fca0	286	prefix = NULL;
9590b041	287	if (p->option & NEEDS_PREFIX)
a633fca0	288	prefix = setup_git_directory();
9590b041 JH	289	if (p->option & USE_PAGER)
9590b041 JH	290	setup_pager();
575ba9d6 ML	291	if (getenv("GIT_TRACE")) {
	292	int i;
	293	fprintf(stderr, "trace: built-in: git");
	294	for (i = 0; i < argc; ++i) {
	295	fputc(' ', stderr);
	296	sq_quote_print(stderr, argv[i]);
	297	}
	298	putc('\n', stderr);
	299	fflush(stderr);
	300	}
	301
a633fca0	302	exit(p->fn(argc, argv, prefix));
231af832 LT	303	}
	304	}
	305
9201c707	306	int main(int argc, const char argv, char envp)
8e49d503	307	{
9201c707	308	const char *cmd = argv[0];
231af832	309	char *slash = strrchr(cmd, '/');
231af832	310	const char *exec_path = NULL;
a025463b	311	int done_alias = 0;
231af832 LT	312
	313	/*
	314	* Take the basename of argv[0] as the command
	315	* name, and the dirname as the default exec_path
	316	* if it's an absolute path and we don't have
	317	* anything better.
	318	*/
	319	if (slash) {
	320	*slash++ = 0;
	321	if (*cmd == '/')
	322	exec_path = cmd;
	323	cmd = slash;
	324	}
8e49d503	325
231af832 LT	326	/*
	327	* "git-xxxx" is the same as "git xxxx", but we obviously:
	328	*
	329	* - cannot take flags in between the "git" and the "xxxx".
	330	* - cannot execute it externally (since it would just do
	331	* the same thing over again)
	332	*
	333	* So we just directly call the internal command handler, and
	334	* die if that one cannot handle it.
	335	*/
	336	if (!strncmp(cmd, "git-", 4)) {
	337	cmd += 4;
	338	argv[0] = cmd;
	339	handle_internal_command(argc, argv, envp);
	340	die("cannot handle %s internally", cmd);
	341	}
8e49d503	342
231af832	343	/* Look for flags.. */
6acbcb92 JS	344	argv++;
	345	argc--;
	346	handle_options(&argv, &argc);
	347	if (argc > 0) {
	348	if (!strncmp(argv[0], "--", 2))
	349	argv[0] += 2;
	350	} else {
	351	/* Default command: "help" */
	352	argv[0] = "help";
	353	argc = 1;
97fc6c5f	354	}
6acbcb92	355	cmd = argv[0];
231af832 LT	356
	357	/*
	358	* We search for git commands in the following order:
	359	* - git_exec_path()
	360	* - the path of the "git" command if we could find it
	361	* in $0
	362	* - the regular PATH.
	363	*/
	364	if (exec_path)
	365	prepend_to_path(exec_path, strlen(exec_path));
77cb17e9 MO	366	exec_path = git_exec_path();
77cb17e9 MO	367	prepend_to_path(exec_path, strlen(exec_path));
8e49d503	368
a025463b JH	369	while (1) {
	370	/* See if it's an internal command */
	371	handle_internal_command(argc, argv, envp);
2b11e317	372
a025463b JH	373	/* .. then try the external ones */
a025463b JH	374	execv_git_cmd(argv);
231af832	375
a025463b JH	376	/* It could be an alias -- this works around the insanity
	377	* of overriding "git log" with "git show" by having
	378	* alias.log = show
	379	*/
	380	if (done_alias \|\| !handle_alias(&argc, &argv))
	381	break;
	382	done_alias = 1;
	383	}
10b15b86 AR	384
10b15b86 AR	385	if (errno == ENOENT)
822a7d50	386	help_unknown_cmd(cmd);
10b15b86 AR	387
10b15b86 AR	388	fprintf(stderr, "Failed to run command '%s': %s\n",
33ebb871	389	cmd, strerror(errno));
8e49d503 AE	390
	391	return 1;
	392	}