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#include "cache.h"
#include "exec_cmd.h"
#include "quote.h"
#define MAX_ARGS	32
 
extern char **environ;
static const char *argv_exec_path;
static const char *argv0_path;
 
const char *system_path(const char *path)
{
	static const char *prefix = PREFIX;
	struct strbuf d = STRBUF_INIT;
 
	if (is_absolute_path(path))
		return path;
 
	strbuf_addf(&d, "%s/%s", prefix, path);
	path = strbuf_detach(&d, NULL);
	return path;
}
 
const char *git_extract_argv0_path(const char *argv0)
{
	const char *slash = argv0 + strlen(argv0);
 
	while (argv0 <= slash && !is_dir_sep(*slash))
		slash--;
 
	if (slash >= argv0) {
		argv0_path = xstrndup(argv0, slash - argv0);
		return slash + 1;
	}
 
	return argv0;
}
 
void git_set_argv_exec_path(const char *exec_path)
{
	argv_exec_path = exec_path;
}
 
 
/* Returns the highest-priority, location to look for git programs. */
const char *git_exec_path(void)
{
	const char *env;
 
	if (argv_exec_path)
		return argv_exec_path;
 
	env = getenv(EXEC_PATH_ENVIRONMENT);
	if (env && *env) {
		return env;
	}
 
	return system_path(GIT_EXEC_PATH);
}
 
static void add_path(struct strbuf *out, const char *path)
{
	if (path && *path) {
		if (is_absolute_path(path))
			strbuf_addstr(out, path);
		else
			strbuf_addstr(out, make_nonrelative_path(path));
 
		strbuf_addch(out, PATH_SEP);
	}
}
 
void setup_path(void)
{
	const char *old_path = getenv("PATH");
	struct strbuf new_path = STRBUF_INIT;
 
	add_path(&new_path, argv_exec_path);
	add_path(&new_path, getenv(EXEC_PATH_ENVIRONMENT));
	add_path(&new_path, system_path(GIT_EXEC_PATH));
	add_path(&new_path, argv0_path);
 
	if (old_path)
		strbuf_addstr(&new_path, old_path);
	else
		strbuf_addstr(&new_path, "/usr/local/bin:/usr/bin:/bin");
 
	setenv("PATH", new_path.buf, 1);
 
	strbuf_release(&new_path);
}
 
const char **prepare_git_cmd(const char **argv)
{
	int argc;
	const char **nargv;
 
	for (argc = 0; argv[argc]; argc++)
		; /* just counting */
	nargv = xmalloc(sizeof(*nargv) * (argc + 2));
 
	nargv[0] = "git";
	for (argc = 0; argv[argc]; argc++)
		nargv[argc + 1] = argv[argc];
	nargv[argc + 1] = NULL;
	return nargv;
}
 
int execv_git_cmd(const char **argv) {
	const char **nargv = prepare_git_cmd(argv);
	trace_argv_printf(nargv, "trace: exec:");
 
	/* execvp() can only ever return if it fails */
	execvp("git", (char **)nargv);
 
	trace_printf("trace: exec failed: %s\n", strerror(errno));
 
	free(nargv);
	return -1;
}
 
 
int execl_git_cmd(const char *cmd,...)
{
	int argc;
	const char *argv[MAX_ARGS + 1];
	const char *arg;
	va_list param;
 
	va_start(param, cmd);
	argv[0] = cmd;
	argc = 1;
	while (argc < MAX_ARGS) {
		arg = argv[argc++] = va_arg(param, char *);
		if (!arg)
			break;
	}
	va_end(param);
	if (MAX_ARGS <= argc)
		return error("too many args to run %s", cmd);
 
	argv[argc] = NULL;
	return execv_git_cmd(argv);
}