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#include "cache.h"
#include "exec_cmd.h"
#define MAX_ARGS 32
extern char **environ;
static const char *builtin_exec_path = GIT_EXEC_PATH;
static const char *current_exec_path = NULL;
void git_set_exec_path(const char *exec_path)
{
current_exec_path = exec_path;
}
/* Returns the highest-priority, location to look for git programs. */
const char *git_exec_path()
{
const char *env;
if (current_exec_path)
return current_exec_path;
env = getenv("GIT_EXEC_PATH");
if (env) {
return env;
}
return builtin_exec_path;
}
int execv_git_cmd(char **argv)
{
char git_command[PATH_MAX + 1];
char *tmp;
int len, err, i;
const char *paths[] = { current_exec_path,
getenv("GIT_EXEC_PATH"),
builtin_exec_path };
for (i = 0; i < sizeof(paths)/sizeof(paths[0]); ++i) {
const char *exec_dir = paths[i];
if (!exec_dir) continue;
if (*exec_dir != '/') {
if (!getcwd(git_command, sizeof(git_command))) {
fprintf(stderr, "git: cannot determine "
"current directory\n");
exit(1);
}
len = strlen(git_command);
/* Trivial cleanup */
while (!strncmp(exec_dir, "./", 2)) {
exec_dir += 2;
while (*exec_dir == '/')
exec_dir++;
}
snprintf(git_command + len, sizeof(git_command) - len,
"/%s", exec_dir);
} else {
strcpy(git_command, exec_dir);
}
len = strlen(git_command);
len += snprintf(git_command + len, sizeof(git_command) - len,
"/git-%s", argv[0]);
if (sizeof(git_command) <= len) {
fprintf(stderr,
"git: command name given is too long.\n");
break;
}
/* argv[0] must be the git command, but the argv array
* belongs to the caller, and my be reused in
* subsequent loop iterations. Save argv[0] and
* restore it on error.
*/
tmp = argv[0];
argv[0] = git_command;
/* execve() can only ever return if it fails */
execve(git_command, argv, environ);
err = errno;
argv[0] = tmp;
}
return -1;
}
int execl_git_cmd(char *cmd,...)
{
int argc;
char *argv[MAX_ARGS + 1];
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);
}
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