mirror of
https://github.com/git/git.git
synced 2024-11-24 10:26:17 +08:00
d4ebc36c5e
We broke the discipline Linus set up to allow compiler help us avoid typos in environment names in the early days of git over time. This defines a handful preprocessor constants for environment variable names used in relatively core parts of the system. I've left out variable names specific to subsystems such as HTTP and SSL as I do not think they are big problems. Signed-off-by: Junio C Hamano <junkio@cox.net>
136 lines
2.8 KiB
C
136 lines
2.8 KiB
C
#include "cache.h"
|
|
#include "exec_cmd.h"
|
|
#include "quote.h"
|
|
#define MAX_ARGS 32
|
|
|
|
extern char **environ;
|
|
static const char *builtin_exec_path = GIT_EXEC_PATH;
|
|
static const char *current_exec_path;
|
|
|
|
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(void)
|
|
{
|
|
const char *env;
|
|
|
|
if (current_exec_path)
|
|
return current_exec_path;
|
|
|
|
env = getenv(EXEC_PATH_ENVIRONMENT);
|
|
if (env && *env) {
|
|
return env;
|
|
}
|
|
|
|
return builtin_exec_path;
|
|
}
|
|
|
|
|
|
int execv_git_cmd(const char **argv)
|
|
{
|
|
char git_command[PATH_MAX + 1];
|
|
int i;
|
|
const char *paths[] = { current_exec_path,
|
|
getenv(EXEC_PATH_ENVIRONMENT),
|
|
builtin_exec_path };
|
|
|
|
for (i = 0; i < ARRAY_SIZE(paths); ++i) {
|
|
size_t len;
|
|
int rc;
|
|
const char *exec_dir = paths[i];
|
|
const char *tmp;
|
|
|
|
if (!exec_dir || !*exec_dir) continue;
|
|
|
|
if (*exec_dir != '/') {
|
|
if (!getcwd(git_command, sizeof(git_command))) {
|
|
fprintf(stderr, "git: cannot determine "
|
|
"current directory: %s\n",
|
|
strerror(errno));
|
|
break;
|
|
}
|
|
len = strlen(git_command);
|
|
|
|
/* Trivial cleanup */
|
|
while (!strncmp(exec_dir, "./", 2)) {
|
|
exec_dir += 2;
|
|
while (*exec_dir == '/')
|
|
exec_dir++;
|
|
}
|
|
|
|
rc = snprintf(git_command + len,
|
|
sizeof(git_command) - len, "/%s",
|
|
exec_dir);
|
|
if (rc < 0 || rc >= sizeof(git_command) - len) {
|
|
fprintf(stderr, "git: command name given "
|
|
"is too long.\n");
|
|
break;
|
|
}
|
|
} else {
|
|
if (strlen(exec_dir) + 1 > sizeof(git_command)) {
|
|
fprintf(stderr, "git: command name given "
|
|
"is too long.\n");
|
|
break;
|
|
}
|
|
strcpy(git_command, exec_dir);
|
|
}
|
|
|
|
len = strlen(git_command);
|
|
rc = snprintf(git_command + len, sizeof(git_command) - len,
|
|
"/git-%s", argv[0]);
|
|
if (rc < 0 || rc >= 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;
|
|
|
|
trace_argv_printf(argv, -1, "trace: exec:");
|
|
|
|
/* execve() can only ever return if it fails */
|
|
execve(git_command, (char **)argv, environ);
|
|
|
|
trace_printf("trace: exec failed: %s\n", strerror(errno));
|
|
|
|
argv[0] = tmp;
|
|
}
|
|
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);
|
|
}
|