mirror of
https://github.com/git/git.git
synced 2024-06-10 13:26:12 +02:00
77cb17e940
The git suite may not be in PATH (and thus programs such as git-send-pack could not exec git-rev-list). Thus there is a need for logic that will locate these programs. Modifying PATH is not desirable as it result in behavior differing from the user's intentions, as we may end up prepending "/usr/bin" to PATH. - git C programs will use exec*_git_cmd() APIs to exec sub-commands. - exec*_git_cmd() will execute a git program by searching for it in the following directories: 1. --exec-path (as used by "git") 2. The GIT_EXEC_PATH environment variable. 3. $(gitexecdir) as set in Makefile (default value $(bindir)). - git wrapper will modify PATH as before to enable shell scripts to invoke "git-foo" commands. Ideally, shell scripts should use the git wrapper to become independent of PATH, and then modifying PATH will not be necessary. [jc: with minor updates after a brief review.] Signed-off-by: Michal Ostrowski <mostrows@watson.ibm.com> Signed-off-by: Junio C Hamano <junkio@cox.net>
118 lines
2.3 KiB
C
118 lines
2.3 KiB
C
#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);
|
|
}
|