mirror of
https://github.com/git/git
synced 2024-08-24 18:26:02 +00:00
![Junio C Hamano](/assets/img/avatar_default.png)
* js/runtime-prefix: Avoid multiple PREFIX definitions git_setup_gettext: plug memory leak gettext: avoid initialization if the locale dir is not present
366 lines
8 KiB
C
366 lines
8 KiB
C
#include "cache.h"
|
|
#include "exec-cmd.h"
|
|
#include "quote.h"
|
|
#include "argv-array.h"
|
|
|
|
#if defined(RUNTIME_PREFIX)
|
|
|
|
#if defined(HAVE_NS_GET_EXECUTABLE_PATH)
|
|
#include <mach-o/dyld.h>
|
|
#endif
|
|
|
|
#if defined(HAVE_BSD_KERN_PROC_SYSCTL)
|
|
#include <sys/param.h>
|
|
#include <sys/types.h>
|
|
#include <sys/sysctl.h>
|
|
#endif
|
|
|
|
#endif /* RUNTIME_PREFIX */
|
|
|
|
#define MAX_ARGS 32
|
|
|
|
static const char *system_prefix(void);
|
|
|
|
#ifdef RUNTIME_PREFIX
|
|
|
|
/**
|
|
* When using a runtime prefix, Git dynamically resolves paths relative to its
|
|
* executable.
|
|
*
|
|
* The method for determining the path of the executable is highly
|
|
* platform-specific.
|
|
*/
|
|
|
|
/**
|
|
* Path to the current Git executable. Resolved on startup by
|
|
* 'git_resolve_executable_dir'.
|
|
*/
|
|
static const char *executable_dirname;
|
|
|
|
static const char *system_prefix(void)
|
|
{
|
|
static const char *prefix;
|
|
|
|
assert(executable_dirname);
|
|
assert(is_absolute_path(executable_dirname));
|
|
|
|
if (!prefix &&
|
|
!(prefix = strip_path_suffix(executable_dirname, GIT_EXEC_PATH)) &&
|
|
!(prefix = strip_path_suffix(executable_dirname, BINDIR)) &&
|
|
!(prefix = strip_path_suffix(executable_dirname, "git"))) {
|
|
prefix = FALLBACK_RUNTIME_PREFIX;
|
|
trace_printf("RUNTIME_PREFIX requested, "
|
|
"but prefix computation failed. "
|
|
"Using static fallback '%s'.\n", prefix);
|
|
}
|
|
return prefix;
|
|
}
|
|
|
|
/*
|
|
* Resolves the executable path from argv[0], only if it is absolute.
|
|
*
|
|
* Returns 0 on success, -1 on failure.
|
|
*/
|
|
static int git_get_exec_path_from_argv0(struct strbuf *buf, const char *argv0)
|
|
{
|
|
const char *slash;
|
|
|
|
if (!argv0 || !*argv0)
|
|
return -1;
|
|
|
|
slash = find_last_dir_sep(argv0);
|
|
if (slash) {
|
|
trace_printf("trace: resolved executable path from argv0: %s\n",
|
|
argv0);
|
|
strbuf_add_absolute_path(buf, argv0);
|
|
return 0;
|
|
}
|
|
return -1;
|
|
}
|
|
|
|
#ifdef PROCFS_EXECUTABLE_PATH
|
|
/*
|
|
* Resolves the executable path by examining a procfs symlink.
|
|
*
|
|
* Returns 0 on success, -1 on failure.
|
|
*/
|
|
static int git_get_exec_path_procfs(struct strbuf *buf)
|
|
{
|
|
if (strbuf_realpath(buf, PROCFS_EXECUTABLE_PATH, 0)) {
|
|
trace_printf(
|
|
"trace: resolved executable path from procfs: %s\n",
|
|
buf->buf);
|
|
return 0;
|
|
}
|
|
return -1;
|
|
}
|
|
#endif /* PROCFS_EXECUTABLE_PATH */
|
|
|
|
#ifdef HAVE_BSD_KERN_PROC_SYSCTL
|
|
/*
|
|
* Resolves the executable path using KERN_PROC_PATHNAME BSD sysctl.
|
|
*
|
|
* Returns 0 on success, -1 on failure.
|
|
*/
|
|
static int git_get_exec_path_bsd_sysctl(struct strbuf *buf)
|
|
{
|
|
int mib[4];
|
|
char path[MAXPATHLEN];
|
|
size_t cb = sizeof(path);
|
|
|
|
mib[0] = CTL_KERN;
|
|
mib[1] = KERN_PROC;
|
|
mib[2] = KERN_PROC_PATHNAME;
|
|
mib[3] = -1;
|
|
if (!sysctl(mib, 4, path, &cb, NULL, 0)) {
|
|
trace_printf(
|
|
"trace: resolved executable path from sysctl: %s\n",
|
|
path);
|
|
strbuf_addstr(buf, path);
|
|
return 0;
|
|
}
|
|
return -1;
|
|
}
|
|
#endif /* HAVE_BSD_KERN_PROC_SYSCTL */
|
|
|
|
#ifdef HAVE_NS_GET_EXECUTABLE_PATH
|
|
/*
|
|
* Resolves the executable path by querying Darwin application stack.
|
|
*
|
|
* Returns 0 on success, -1 on failure.
|
|
*/
|
|
static int git_get_exec_path_darwin(struct strbuf *buf)
|
|
{
|
|
char path[PATH_MAX];
|
|
uint32_t size = sizeof(path);
|
|
if (!_NSGetExecutablePath(path, &size)) {
|
|
trace_printf(
|
|
"trace: resolved executable path from Darwin stack: %s\n",
|
|
path);
|
|
strbuf_addstr(buf, path);
|
|
return 0;
|
|
}
|
|
return -1;
|
|
}
|
|
#endif /* HAVE_NS_GET_EXECUTABLE_PATH */
|
|
|
|
#ifdef HAVE_WPGMPTR
|
|
/*
|
|
* Resolves the executable path by using the global variable _wpgmptr.
|
|
*
|
|
* Returns 0 on success, -1 on failure.
|
|
*/
|
|
static int git_get_exec_path_wpgmptr(struct strbuf *buf)
|
|
{
|
|
int len = wcslen(_wpgmptr) * 3 + 1;
|
|
strbuf_grow(buf, len);
|
|
len = xwcstoutf(buf->buf, _wpgmptr, len);
|
|
if (len < 0)
|
|
return -1;
|
|
buf->len += len;
|
|
return 0;
|
|
}
|
|
#endif /* HAVE_WPGMPTR */
|
|
|
|
/*
|
|
* Resolves the absolute path of the current executable.
|
|
*
|
|
* Returns 0 on success, -1 on failure.
|
|
*/
|
|
static int git_get_exec_path(struct strbuf *buf, const char *argv0)
|
|
{
|
|
/*
|
|
* Identifying the executable path is operating system specific.
|
|
* Selectively employ all available methods in order of preference,
|
|
* preferring highly-available authoritative methods over
|
|
* selectively-available or non-authoritative methods.
|
|
*
|
|
* All cases fall back on resolving against argv[0] if there isn't a
|
|
* better functional method. However, note that argv[0] can be
|
|
* used-supplied on many operating systems, and is not authoritative
|
|
* in those cases.
|
|
*
|
|
* Each of these functions returns 0 on success, so evaluation will stop
|
|
* after the first successful method.
|
|
*/
|
|
if (
|
|
#ifdef HAVE_BSD_KERN_PROC_SYSCTL
|
|
git_get_exec_path_bsd_sysctl(buf) &&
|
|
#endif /* HAVE_BSD_KERN_PROC_SYSCTL */
|
|
|
|
#ifdef HAVE_NS_GET_EXECUTABLE_PATH
|
|
git_get_exec_path_darwin(buf) &&
|
|
#endif /* HAVE_NS_GET_EXECUTABLE_PATH */
|
|
|
|
#ifdef PROCFS_EXECUTABLE_PATH
|
|
git_get_exec_path_procfs(buf) &&
|
|
#endif /* PROCFS_EXECUTABLE_PATH */
|
|
|
|
#ifdef HAVE_WPGMPTR
|
|
git_get_exec_path_wpgmptr(buf) &&
|
|
#endif /* HAVE_WPGMPTR */
|
|
|
|
git_get_exec_path_from_argv0(buf, argv0)) {
|
|
return -1;
|
|
}
|
|
|
|
if (strbuf_normalize_path(buf)) {
|
|
trace_printf("trace: could not normalize path: %s\n", buf->buf);
|
|
return -1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
void git_resolve_executable_dir(const char *argv0)
|
|
{
|
|
struct strbuf buf = STRBUF_INIT;
|
|
char *resolved;
|
|
const char *slash;
|
|
|
|
if (git_get_exec_path(&buf, argv0)) {
|
|
trace_printf(
|
|
"trace: could not determine executable path from: %s\n",
|
|
argv0);
|
|
strbuf_release(&buf);
|
|
return;
|
|
}
|
|
|
|
resolved = strbuf_detach(&buf, NULL);
|
|
slash = find_last_dir_sep(resolved);
|
|
if (slash)
|
|
resolved[slash - resolved] = '\0';
|
|
|
|
executable_dirname = resolved;
|
|
trace_printf("trace: resolved executable dir: %s\n",
|
|
executable_dirname);
|
|
}
|
|
|
|
#else
|
|
|
|
/*
|
|
* When not using a runtime prefix, Git uses a hard-coded path.
|
|
*/
|
|
static const char *system_prefix(void)
|
|
{
|
|
return FALLBACK_RUNTIME_PREFIX;
|
|
}
|
|
|
|
/*
|
|
* This is called during initialization, but No work needs to be done here when
|
|
* runtime prefix is not being used.
|
|
*/
|
|
void git_resolve_executable_dir(const char *argv0)
|
|
{
|
|
}
|
|
|
|
#endif /* RUNTIME_PREFIX */
|
|
|
|
char *system_path(const char *path)
|
|
{
|
|
struct strbuf d = STRBUF_INIT;
|
|
|
|
if (is_absolute_path(path))
|
|
return xstrdup(path);
|
|
|
|
strbuf_addf(&d, "%s/%s", system_prefix(), path);
|
|
return strbuf_detach(&d, NULL);
|
|
}
|
|
|
|
static const char *exec_path_value;
|
|
|
|
void git_set_exec_path(const char *exec_path)
|
|
{
|
|
exec_path_value = exec_path;
|
|
/*
|
|
* Propagate this setting to external programs.
|
|
*/
|
|
setenv(EXEC_PATH_ENVIRONMENT, exec_path, 1);
|
|
}
|
|
|
|
/* Returns the highest-priority location to look for git programs. */
|
|
const char *git_exec_path(void)
|
|
{
|
|
if (!exec_path_value) {
|
|
const char *env = getenv(EXEC_PATH_ENVIRONMENT);
|
|
if (env && *env)
|
|
exec_path_value = xstrdup(env);
|
|
else
|
|
exec_path_value = system_path(GIT_EXEC_PATH);
|
|
}
|
|
return exec_path_value;
|
|
}
|
|
|
|
static void add_path(struct strbuf *out, const char *path)
|
|
{
|
|
if (path && *path) {
|
|
strbuf_add_absolute_path(out, path);
|
|
strbuf_addch(out, PATH_SEP);
|
|
}
|
|
}
|
|
|
|
void setup_path(void)
|
|
{
|
|
const char *exec_path = git_exec_path();
|
|
const char *old_path = getenv("PATH");
|
|
struct strbuf new_path = STRBUF_INIT;
|
|
|
|
git_set_exec_path(exec_path);
|
|
add_path(&new_path, exec_path);
|
|
|
|
if (old_path)
|
|
strbuf_addstr(&new_path, old_path);
|
|
else
|
|
strbuf_addstr(&new_path, _PATH_DEFPATH);
|
|
|
|
setenv("PATH", new_path.buf, 1);
|
|
|
|
strbuf_release(&new_path);
|
|
}
|
|
|
|
const char **prepare_git_cmd(struct argv_array *out, const char **argv)
|
|
{
|
|
argv_array_push(out, "git");
|
|
argv_array_pushv(out, argv);
|
|
return out->argv;
|
|
}
|
|
|
|
int execv_git_cmd(const char **argv)
|
|
{
|
|
struct argv_array nargv = ARGV_ARRAY_INIT;
|
|
|
|
prepare_git_cmd(&nargv, argv);
|
|
trace_argv_printf(nargv.argv, "trace: exec:");
|
|
|
|
/* execvp() can only ever return if it fails */
|
|
sane_execvp("git", (char **)nargv.argv);
|
|
|
|
trace_printf("trace: exec failed: %s\n", strerror(errno));
|
|
|
|
argv_array_clear(&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);
|
|
}
|