[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 <sys/ioctl.h>
#include "git-compat-util.h"
#include "exec_cmd.h"

#include "cache.h"
#include "commit.h"
#include "revision.h"

#ifndef PATH_MAX
# define PATH_MAX 4096
#endif

static const char git_usage[] =
	"Usage: git [--version] [--exec-path[=GIT_EXEC_PATH]] [--help] COMMAND [ ARGS ]";

/* most gui terms set COLUMNS (although some don't export it) */
static int term_columns(void)
{
	char *col_string = getenv("COLUMNS");
	int n_cols = 0;

	if (col_string && (n_cols = atoi(col_string)) > 0)
		return n_cols;

#ifdef TIOCGWINSZ
	{
		struct winsize ws;
		if (!ioctl(1, TIOCGWINSZ, &ws)) {
			if (ws.ws_col)
				return ws.ws_col;
		}
	}
#endif

	return 80;
}

static void oom(void)
{
	fprintf(stderr, "git: out of memory\n");
	exit(1);
}

static inline void mput_char(char c, unsigned int num)
{
	while(num--)
		putchar(c);
}

static struct cmdname {
	size_t len;
	char name[1];
} **cmdname;
static int cmdname_alloc, cmdname_cnt;

static void add_cmdname(const char *name, int len)
{
	struct cmdname *ent;
	if (cmdname_alloc <= cmdname_cnt) {
		cmdname_alloc = cmdname_alloc + 200;
		cmdname = realloc(cmdname, cmdname_alloc * sizeof(*cmdname));
		if (!cmdname)
			oom();
	}
	ent = malloc(sizeof(*ent) + len);
	if (!ent)
		oom();
	ent->len = len;
	memcpy(ent->name, name, len);
	ent->name[len] = 0;
	cmdname[cmdname_cnt++] = ent;
}

static int cmdname_compare(const void *a_, const void *b_)
{
	struct cmdname *a = *(struct cmdname **)a_;
	struct cmdname *b = *(struct cmdname **)b_;
	return strcmp(a->name, b->name);
}

static void pretty_print_string_list(struct cmdname **cmdname, int longest)
{
	int cols = 1, rows;
	int space = longest + 1; /* min 1 SP between words */
	int max_cols = term_columns() - 1; /* don't print *on* the edge */
	int i, j;

	if (space < max_cols)
		cols = max_cols / space;
	rows = (cmdname_cnt + cols - 1) / cols;

	qsort(cmdname, cmdname_cnt, sizeof(*cmdname), cmdname_compare);

	for (i = 0; i < rows; i++) {
		printf("  ");

		for (j = 0; j < cols; j++) {
			int n = j * rows + i;
			int size = space;
			if (n >= cmdname_cnt)
				break;
			if (j == cols-1 || n + rows >= cmdname_cnt)
				size = 1;
			printf("%-*s", size, cmdname[n]->name);
		}
		putchar('\n');
	}
}

static void list_commands(const char *exec_path, const char *pattern)
{
	unsigned int longest = 0;
	char path[PATH_MAX];
	int dirlen;
	DIR *dir = opendir(exec_path);
	struct dirent *de;

	if (!dir) {
		fprintf(stderr, "git: '%s': %s\n", exec_path, strerror(errno));
		exit(1);
	}

	dirlen = strlen(exec_path);
	if (PATH_MAX - 20 < dirlen) {
		fprintf(stderr, "git: insanely long exec-path '%s'\n",
			exec_path);
		exit(1);
	}

	memcpy(path, exec_path, dirlen);
	path[dirlen++] = '/';

	while ((de = readdir(dir)) != NULL) {
		struct stat st;
		int entlen;

		if (strncmp(de->d_name, "git-", 4))
			continue;
		strcpy(path+dirlen, de->d_name);
		if (stat(path, &st) || /* stat, not lstat */
		    !S_ISREG(st.st_mode) ||
		    !(st.st_mode & S_IXUSR))
			continue;

		entlen = strlen(de->d_name);
		if (4 < entlen && !strcmp(de->d_name + entlen - 4, ".exe"))
			entlen -= 4;

		if (longest < entlen)
			longest = entlen;

		add_cmdname(de->d_name + 4, entlen-4);
	}
	closedir(dir);

	printf("git commands available in '%s'\n", exec_path);
	printf("----------------------------");
	mput_char('-', strlen(exec_path));
	putchar('\n');
	pretty_print_string_list(cmdname, longest - 4);
	putchar('\n');
}

#ifdef __GNUC__
static void cmd_usage(const char *exec_path, const char *fmt, ...)
	__attribute__((__format__(__printf__, 2, 3), __noreturn__));
#endif
static void cmd_usage(const char *exec_path, const char *fmt, ...)
{
	if (fmt) {
		va_list ap;

		va_start(ap, fmt);
		printf("git: ");
		vprintf(fmt, ap);
		va_end(ap);
		putchar('\n');
	}
	else
		puts(git_usage);

	putchar('\n');

	if(exec_path)
		list_commands(exec_path, "git-*");

	exit(1);
}

static void prepend_to_path(const char *dir, int len)
{
	char *path, *old_path = getenv("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 void show_man_page(const char *git_cmd)
{
	const char *page;

	if (!strncmp(git_cmd, "git", 3))
		page = git_cmd;
	else {
		int page_len = strlen(git_cmd) + 4;
		char *p = malloc(page_len + 1);
		strcpy(p, "git-");
		strcpy(p + 4, git_cmd);
		p[page_len] = 0;
		page = p;
	}

	execlp("man", "man", page, NULL);
}

static int cmd_version(int argc, const char **argv, char **envp)
{
	printf("git version %s\n", GIT_VERSION);
	return 0;
}

static int cmd_help(int argc, const char **argv, char **envp)
{
	const char *help_cmd = argv[1];
	if (!help_cmd)
		cmd_usage(git_exec_path(), NULL);
	show_man_page(help_cmd);
	return 0;
}

#define LOGSIZE (65536)

static int cmd_log(int argc, const char **argv, char **envp)
{
	struct rev_info rev;
	struct commit *commit;
	char *buf = xmalloc(LOGSIZE);
	static enum cmit_fmt commit_format = CMIT_FMT_DEFAULT;
	int abbrev = DEFAULT_ABBREV;
	int show_parents = 0;
	const char *commit_prefix = "commit ";

	argc = setup_revisions(argc, argv, &rev, "HEAD");
	while (1 < argc) {
		const char *arg = argv[1];
		if (!strncmp(arg, "--pretty", 8)) {
			commit_format = get_commit_format(arg + 8);
			if (commit_format == CMIT_FMT_ONELINE)
				commit_prefix = "";
		}
		else if (!strcmp(arg, "--parents")) {
			show_parents = 1;
		}
		else if (!strcmp(arg, "--no-abbrev")) {
			abbrev = 0;
		}
		else if (!strncmp(arg, "--abbrev=", 9)) {
			abbrev = strtoul(arg + 9, NULL, 10);
			if (abbrev && abbrev < MINIMUM_ABBREV)
				abbrev = MINIMUM_ABBREV;
			else if (40 < abbrev)
				abbrev = 40;
		}
		else
			die("unrecognized argument: %s", arg);
		argc--; argv++;
	}

	prepare_revision_walk(&rev);
	setup_pager();
	while ((commit = get_revision(&rev)) != NULL) {
		printf("%s%s", commit_prefix,
		       sha1_to_hex(commit->object.sha1));
		if (show_parents) {
			struct commit_list *parents = commit->parents;
			while (parents) {
				struct object *o = &(parents->item->object);
				parents = parents->next;
				if (o->flags & TMP_MARK)
					continue;
				printf(" %s", sha1_to_hex(o->sha1));
				o->flags |= TMP_MARK;
			}
			/* TMP_MARK is a general purpose flag that can
			 * be used locally, but the user should clean
			 * things up after it is done with them.
			 */
			for (parents = commit->parents;
			     parents;
			     parents = parents->next)
				parents->item->object.flags &= ~TMP_MARK;
		}
		if (commit_format == CMIT_FMT_ONELINE)
			putchar(' ');
		else
			putchar('\n');
		pretty_print_commit(commit_format, commit, ~0, buf,
				    LOGSIZE, abbrev);
		printf("%s\n", buf);
	}
	free(buf);
	return 0;
}

#define ARRAY_SIZE(x) (sizeof(x)/sizeof(x[0]))

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 **, char **);
	} commands[] = {
		{ "version", cmd_version },
		{ "help", cmd_help },
		{ "log", cmd_log },
	};
	int i;

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

int main(int argc, const char **argv, char **envp)
{
	const char *cmd = argv[0];
	char *slash = strrchr(cmd, '/');
	char git_command[PATH_MAX + 1];
	const char *exec_path = NULL;

	/*
	 * 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);
	}

	/* Default command: "help" */
	cmd = "help";

	/* Look for flags.. */
	while (argc > 1) {
		cmd = *++argv;
		argc--;

		if (strncmp(cmd, "--", 2))
			break;

		cmd += 2;

		/*
		 * For legacy reasons, the "version" and "help"
		 * commands can be written with "--" prepended
		 * to make them look like flags.
		 */
		if (!strcmp(cmd, "help"))
			break;
		if (!strcmp(cmd, "version"))
			break;

		/*
		 * Check remaining flags (which by now must be
		 * "--exec-path", but maybe we will accept
		 * other arguments some day)
		 */
		if (!strncmp(cmd, "exec-path", 9)) {
			cmd += 9;
			if (*cmd == '=') {
				git_set_exec_path(cmd + 1);
				continue;
			}
			puts(git_exec_path());
			exit(0);
		}
		cmd_usage(NULL, NULL);
	}
	argv[0] = cmd;

	/*
	 * 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));

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

	/* .. then try the external ones */
	execv_git_cmd(argv);

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

	fprintf(stderr, "Failed to run command '%s': %s\n",
		git_command, 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>
ea77e675	11	#include <sys/ioctl.h>
4050c0df	12	#include "git-compat-util.h"
77cb17e9	13	#include "exec_cmd.h"
8e49d503	14
70b006b9 LT	15	#include "cache.h"
	16	#include "commit.h"
	17	#include "revision.h"
	18
8e49d503 AE	19	#ifndef PATH_MAX
	20	# define PATH_MAX 4096
	21	#endif
	22
	23	static const char git_usage[] =
	24	"Usage: git [--version] [--exec-path[=GIT_EXEC_PATH]] [--help] COMMAND [ ARGS ]";
	25
8e49d503 AE	26	/* most gui terms set COLUMNS (although some don't export it) */
	27	static int term_columns(void)
	28	{
	29	char *col_string = getenv("COLUMNS");
	30	int n_cols = 0;
	31
	32	if (col_string && (n_cols = atoi(col_string)) > 0)
	33	return n_cols;
	34
ea77e675 LT	35	#ifdef TIOCGWINSZ
	36	{
	37	struct winsize ws;
	38	if (!ioctl(1, TIOCGWINSZ, &ws)) {
	39	if (ws.ws_col)
	40	return ws.ws_col;
	41	}
	42	}
	43	#endif
	44
8e49d503 AE	45	return 80;
	46	}
	47
7dbc2c04 JH	48	static void oom(void)
	49	{
	50	fprintf(stderr, "git: out of memory\n");
	51	exit(1);
	52	}
	53
8e49d503 AE	54	static inline void mput_char(char c, unsigned int num)
	55	{
	56	while(num--)
	57	putchar(c);
	58	}
	59
7dbc2c04 JH	60	static struct cmdname {
	61	size_t len;
	62	char name[1];
	63	} **cmdname;
	64	static int cmdname_alloc, cmdname_cnt;
	65
	66	static void add_cmdname(const char *name, int len)
	67	{
	68	struct cmdname *ent;
	69	if (cmdname_alloc <= cmdname_cnt) {
	70	cmdname_alloc = cmdname_alloc + 200;
	71	cmdname = realloc(cmdname, cmdname_alloc * sizeof(*cmdname));
	72	if (!cmdname)
	73	oom();
	74	}
	75	ent = malloc(sizeof(*ent) + len);
	76	if (!ent)
	77	oom();
	78	ent->len = len;
f9039f30 JH	79	memcpy(ent->name, name, len);
f9039f30 JH	80	ent->name[len] = 0;
7dbc2c04 JH	81	cmdname[cmdname_cnt++] = ent;
	82	}
	83
	84	static int cmdname_compare(const void a_, const void b_)
	85	{
	86	struct cmdname a = (struct cmdname **)a_;
	87	struct cmdname b = (struct cmdname **)b_;
	88	return strcmp(a->name, b->name);
	89	}
	90
	91	static void pretty_print_string_list(struct cmdname **cmdname, int longest)
8e49d503	92	{
112d0baf	93	int cols = 1, rows;
8e49d503 AE	94	int space = longest + 1; /* min 1 SP between words */
8e49d503 AE	95	int max_cols = term_columns() - 1; /* don't print on the edge */
112d0baf	96	int i, j;
8e49d503 AE	97
	98	if (space < max_cols)
	99	cols = max_cols / space;
112d0baf	100	rows = (cmdname_cnt + cols - 1) / cols;
8e49d503	101
7dbc2c04 JH	102	qsort(cmdname, cmdname_cnt, sizeof(*cmdname), cmdname_compare);
7dbc2c04 JH	103
112d0baf	104	for (i = 0; i < rows; i++) {
8e49d503 AE	105	printf(" ");
8e49d503 AE	106
112d0baf LT	107	for (j = 0; j < cols; j++) {
	108	int n = j * rows + i;
	109	int size = space;
	110	if (n >= cmdname_cnt)
	111	break;
	112	if (j == cols-1 \|\| n + rows >= cmdname_cnt)
	113	size = 1;
	114	printf("%-*s", size, cmdname[n]->name);
8e49d503 AE	115	}
	116	putchar('\n');
	117	}
	118	}
	119
	120	static void list_commands(const char exec_path, const char pattern)
	121	{
7dbc2c04 JH	122	unsigned int longest = 0;
	123	char path[PATH_MAX];
	124	int dirlen;
	125	DIR *dir = opendir(exec_path);
	126	struct dirent *de;
	127
	128	if (!dir) {
	129	fprintf(stderr, "git: '%s': %s\n", exec_path, strerror(errno));
8e49d503 AE	130	exit(1);
	131	}
	132
7dbc2c04 JH	133	dirlen = strlen(exec_path);
	134	if (PATH_MAX - 20 < dirlen) {
	135	fprintf(stderr, "git: insanely long exec-path '%s'\n",
	136	exec_path);
8e49d503 AE	137	exit(1);
	138	}
	139
7dbc2c04 JH	140	memcpy(path, exec_path, dirlen);
	141	path[dirlen++] = '/';
	142
	143	while ((de = readdir(dir)) != NULL) {
	144	struct stat st;
	145	int entlen;
8e49d503	146
7dbc2c04 JH	147	if (strncmp(de->d_name, "git-", 4))
	148	continue;
	149	strcpy(path+dirlen, de->d_name);
	150	if (stat(path, &st) \|\| /* stat, not lstat */
	151	!S_ISREG(st.st_mode) \|\|
	152	!(st.st_mode & S_IXUSR))
8e49d503 AE	153	continue;
8e49d503 AE	154
7dbc2c04	155	entlen = strlen(de->d_name);
f9039f30 JH	156	if (4 < entlen && !strcmp(de->d_name + entlen - 4, ".exe"))
f9039f30 JH	157	entlen -= 4;
8e49d503	158
7dbc2c04 JH	159	if (longest < entlen)
	160	longest = entlen;
	161
	162	add_cmdname(de->d_name + 4, entlen-4);
8e49d503	163	}
7dbc2c04	164	closedir(dir);
8e49d503 AE	165
	166	printf("git commands available in '%s'\n", exec_path);
	167	printf("----------------------------");
	168	mput_char('-', strlen(exec_path));
	169	putchar('\n');
7dbc2c04	170	pretty_print_string_list(cmdname, longest - 4);
8e49d503 AE	171	putchar('\n');
	172	}
	173
	174	#ifdef __GNUC__
4050c0df	175	static void cmd_usage(const char exec_path, const char fmt, ...)
8e49d503 AE	176	__attribute__((__format__(__printf__, 2, 3), __noreturn__));
8e49d503 AE	177	#endif
4050c0df	178	static void cmd_usage(const char exec_path, const char fmt, ...)
8e49d503 AE	179	{
	180	if (fmt) {
	181	va_list ap;
	182
	183	va_start(ap, fmt);
	184	printf("git: ");
	185	vprintf(fmt, ap);
	186	va_end(ap);
	187	putchar('\n');
	188	}
	189	else
	190	puts(git_usage);
	191
	192	putchar('\n');
	193
	194	if(exec_path)
	195	list_commands(exec_path, "git-*");
	196
	197	exit(1);
	198	}
	199
	200	static void prepend_to_path(const char *dir, int len)
	201	{
	202	char path, old_path = getenv("PATH");
	203	int path_len = len;
	204
	205	if (!old_path)
7dbc2c04	206	old_path = "/usr/local/bin:/usr/bin:/bin";
8e49d503 AE	207
	208	path_len = len + strlen(old_path) + 1;
	209
	210	path = malloc(path_len + 1);
8e49d503 AE	211
	212	memcpy(path, dir, len);
	213	path[len] = ':';
	214	memcpy(path + len + 1, old_path, path_len - len);
	215
	216	setenv("PATH", path, 1);
	217	}
	218
9201c707	219	static void show_man_page(const char *git_cmd)
97fc6c5f	220	{
9201c707	221	const char *page;
97fc6c5f AE	222
	223	if (!strncmp(git_cmd, "git", 3))
	224	page = git_cmd;
	225	else {
	226	int page_len = strlen(git_cmd) + 4;
9201c707 JH	227	char *p = malloc(page_len + 1);
	228	strcpy(p, "git-");
	229	strcpy(p + 4, git_cmd);
	230	p[page_len] = 0;
	231	page = p;
97fc6c5f AE	232	}
97fc6c5f AE	233
7dbc2c04	234	execlp("man", "man", page, NULL);
97fc6c5f AE	235	}
97fc6c5f AE	236
9201c707	237	static int cmd_version(int argc, const char argv, char envp)
231af832 LT	238	{
	239	printf("git version %s\n", GIT_VERSION);
	240	return 0;
	241	}
	242
9201c707	243	static int cmd_help(int argc, const char argv, char envp)
231af832	244	{
9201c707	245	const char *help_cmd = argv[1];
231af832 LT	246	if (!help_cmd)
	247	cmd_usage(git_exec_path(), NULL);
	248	show_man_page(help_cmd);
	249	return 0;
	250	}
	251
70b006b9 LT	252	#define LOGSIZE (65536)
70b006b9 LT	253
9201c707	254	static int cmd_log(int argc, const char argv, char envp)
70b006b9 LT	255	{
	256	struct rev_info rev;
	257	struct commit *commit;
	258	char *buf = xmalloc(LOGSIZE);
7ae0b0cb JH	259	static enum cmit_fmt commit_format = CMIT_FMT_DEFAULT;
	260	int abbrev = DEFAULT_ABBREV;
	261	int show_parents = 0;
	262	const char *commit_prefix = "commit ";
70b006b9 LT	263
70b006b9 LT	264	argc = setup_revisions(argc, argv, &rev, "HEAD");
7ae0b0cb	265	while (1 < argc) {
9201c707	266	const char *arg = argv[1];
64bc6e3d	267	if (!strncmp(arg, "--pretty", 8)) {
7ae0b0cb JH	268	commit_format = get_commit_format(arg + 8);
	269	if (commit_format == CMIT_FMT_ONELINE)
	270	commit_prefix = "";
	271	}
	272	else if (!strcmp(arg, "--parents")) {
	273	show_parents = 1;
	274	}
	275	else if (!strcmp(arg, "--no-abbrev")) {
	276	abbrev = 0;
	277	}
	278	else if (!strncmp(arg, "--abbrev=", 9)) {
	279	abbrev = strtoul(arg + 9, NULL, 10);
	280	if (abbrev && abbrev < MINIMUM_ABBREV)
	281	abbrev = MINIMUM_ABBREV;
	282	else if (40 < abbrev)
	283	abbrev = 40;
	284	}
	285	else
	286	die("unrecognized argument: %s", arg);
	287	argc--; argv++;
	288	}
	289
70b006b9 LT	290	prepare_revision_walk(&rev);
	291	setup_pager();
	292	while ((commit = get_revision(&rev)) != NULL) {
7ae0b0cb JH	293	printf("%s%s", commit_prefix,
	294	sha1_to_hex(commit->object.sha1));
	295	if (show_parents) {
	296	struct commit_list *parents = commit->parents;
	297	while (parents) {
	298	struct object *o = &(parents->item->object);
	299	parents = parents->next;
	300	if (o->flags & TMP_MARK)
	301	continue;
	302	printf(" %s", sha1_to_hex(o->sha1));
	303	o->flags \|= TMP_MARK;
	304	}
	305	/* TMP_MARK is a general purpose flag that can
	306	* be used locally, but the user should clean
	307	* things up after it is done with them.
	308	*/
	309	for (parents = commit->parents;
	310	parents;
	311	parents = parents->next)
	312	parents->item->object.flags &= ~TMP_MARK;
	313	}
	314	if (commit_format == CMIT_FMT_ONELINE)
	315	putchar(' ');
	316	else
	317	putchar('\n');
	318	pretty_print_commit(commit_format, commit, ~0, buf,
	319	LOGSIZE, abbrev);
70b006b9 LT	320	printf("%s\n", buf);
	321	}
	322	free(buf);
	323	return 0;
	324	}
	325
231af832 LT	326	#define ARRAY_SIZE(x) (sizeof(x)/sizeof(x[0]))
231af832 LT	327
9201c707	328	static void handle_internal_command(int argc, const char argv, char envp)
231af832 LT	329	{
	330	const char *cmd = argv[0];
	331	static struct cmd_struct {
	332	const char *cmd;
9201c707	333	int (fn)(int, const char , char *);
231af832 LT	334	} commands[] = {
	335	{ "version", cmd_version },
	336	{ "help", cmd_help },
70b006b9	337	{ "log", cmd_log },
231af832 LT	338	};
	339	int i;
	340
	341	for (i = 0; i < ARRAY_SIZE(commands); i++) {
	342	struct cmd_struct *p = commands+i;
	343	if (strcmp(p->cmd, cmd))
	344	continue;
	345	exit(p->fn(argc, argv, envp));
	346	}
	347	}
	348
9201c707	349	int main(int argc, const char argv, char envp)
8e49d503	350	{
9201c707	351	const char *cmd = argv[0];
231af832	352	char *slash = strrchr(cmd, '/');
8e49d503	353	char git_command[PATH_MAX + 1];
231af832 LT	354	const char *exec_path = NULL;
	355
	356	/*
	357	* Take the basename of argv[0] as the command
	358	* name, and the dirname as the default exec_path
	359	* if it's an absolute path and we don't have
	360	* anything better.
	361	*/
	362	if (slash) {
	363	*slash++ = 0;
	364	if (*cmd == '/')
	365	exec_path = cmd;
	366	cmd = slash;
	367	}
8e49d503	368
231af832 LT	369	/*
	370	* "git-xxxx" is the same as "git xxxx", but we obviously:
	371	*
	372	* - cannot take flags in between the "git" and the "xxxx".
	373	* - cannot execute it externally (since it would just do
	374	* the same thing over again)
	375	*
	376	* So we just directly call the internal command handler, and
	377	* die if that one cannot handle it.
	378	*/
	379	if (!strncmp(cmd, "git-", 4)) {
	380	cmd += 4;
	381	argv[0] = cmd;
	382	handle_internal_command(argc, argv, envp);
	383	die("cannot handle %s internally", cmd);
	384	}
8e49d503	385
231af832 LT	386	/* Default command: "help" */
231af832 LT	387	cmd = "help";
8e49d503	388
231af832 LT	389	/* Look for flags.. */
	390	while (argc > 1) {
	391	cmd = *++argv;
	392	argc--;
da6bf70e	393
231af832	394	if (strncmp(cmd, "--", 2))
8e49d503 AE	395	break;
8e49d503 AE	396
231af832 LT	397	cmd += 2;
	398
	399	/*
	400	* For legacy reasons, the "version" and "help"
	401	* commands can be written with "--" prepended
	402	* to make them look like flags.
	403	*/
	404	if (!strcmp(cmd, "help"))
	405	break;
	406	if (!strcmp(cmd, "version"))
	407	break;
8e49d503	408
231af832 LT	409	/*
	410	* Check remaining flags (which by now must be
	411	* "--exec-path", but maybe we will accept
	412	* other arguments some day)
	413	*/
	414	if (!strncmp(cmd, "exec-path", 9)) {
	415	cmd += 9;
	416	if (*cmd == '=') {
	417	git_set_exec_path(cmd + 1);
	418	continue;
8e49d503	419	}
231af832	420	puts(git_exec_path());
8e49d503 AE	421	exit(0);
8e49d503 AE	422	}
231af832	423	cmd_usage(NULL, NULL);
97fc6c5f	424	}
231af832 LT	425	argv[0] = cmd;
	426
	427	/*
	428	* We search for git commands in the following order:
	429	* - git_exec_path()
	430	* - the path of the "git" command if we could find it
	431	* in $0
	432	* - the regular PATH.
	433	*/
	434	if (exec_path)
	435	prepend_to_path(exec_path, strlen(exec_path));
77cb17e9 MO	436	exec_path = git_exec_path();
77cb17e9 MO	437	prepend_to_path(exec_path, strlen(exec_path));
8e49d503	438
231af832 LT	439	/* See if it's an internal command */
	440	handle_internal_command(argc, argv, envp);
	441
	442	/* .. then try the external ones */
	443	execv_git_cmd(argv);
10b15b86 AR	444
10b15b86 AR	445	if (errno == ENOENT)
231af832	446	cmd_usage(exec_path, "'%s' is not a git-command", cmd);
10b15b86 AR	447
	448	fprintf(stderr, "Failed to run command '%s': %s\n",
	449	git_command, strerror(errno));
8e49d503 AE	450
	451	return 1;
	452	}