1
0
Fork 0
mirror of https://github.com/git/git.git synced 2024-10-30 13:57:54 +01:00
git/exec_cmd.c
Junio C Hamano d4ebc36c5e Use preprocessor constants for environment variable names.
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>
2006-12-19 01:51:51 -08:00

135 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);
}