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#include <lua.h>
#include <stdlib.h>
#include <unistd.h>
#include "log.h"
#include "lua_state.h"
#include "state.h"
#include "str.h"
lua_State *L = NULL;
bool L_is_loaded = false;
static void lua_path_push(const char *new_path) {
lua_getglobal(L, "package");
lua_getfield(L, -1, "path");
const char *current_path = lua_tostring(L, -1);
if (!current_path)
current_path = "";
lua_pop(L, 1);
lua_pushfstring(L, "%s;%s", current_path, new_path);
lua_setfield(L, -2, "path");
lua_pop(L, 1);
}
#define HANDLE_LUA_ERROR \
do { \
log_error("lua: %s", lua_tostring(L, -1)); \
lua_pop(L, 1); \
return false; \
} while (0)
bool init_lua_state(void) {
if (L_is_loaded)
return true;
L = luaL_newstate();
luaL_openlibs(L);
str lua_path = str_format("%.*s/?.lua", str_fmt(&config.dir));
lua_path_push(lua_path.data);
if (luaL_loadfile(L, config.init_path.data) || lua_pcall(L, 0, 1, 0)) {
log_error("cannot run configuration script: %s", lua_tostring(L, -1));
log_pkgit("to generate a configuration file, head into the");
log_pkgit(
"root directory of the pkgit source and run `make defconfig`");
lua_close(L);
return false;
}
if (!lua_istable(L, -1)) {
log_error("top-level configuration is not a table");
lua_pop(L, 1);
lua_close(L);
return false;
}
str_free(&lua_path);
L_is_loaded = true;
return true;
}
static void setup_base_dirs(void) {
int uid = getuid(), euid = geteuid();
config.is_root = false;
if (uid < 0 || uid != euid) {
config.is_root = true;
config.dir = mstr("/etc/pkgit");
} else {
char *tmp = getenv("XDG_CONFIG_HOME");
if (tmp) {
config.dir = str_format("%s/pkgit", tmp);
} else {
config.dir = str_format("%s/.config/pkgit", getenv("HOME"));
}
}
config.init_path = str_format(
"%.*s/init.lua",
str_fmt(&config.dir)
);
config.autogenerated_path = str_format(
"%.*s/autogenerated.lua",
str_fmt(&config.dir)
);
}
#define lua_get_field_type(name, type, file) \
do { \
lua_getfield(L, -1, name); \
if (!lua_is##type(L, -1)) { \
log_error("lua: expected type " #type " for " name " in %.*s", \
str_fmt(file)); \
lua_pop(L, 1); \
return false; \
} \
} while (0)
static bool load_init_lua(void) {
lua_setglobal(L, "__PkgitUserConfig");
lua_getglobal(L, "__PkgitUserConfig");
lua_get_field_type("dirs", table, &config.init_path);
#define X(field) \
do { \
lua_get_field_type(#field, string, &config.init_path); \
config.inst_dirs.field = str_adopt((char *)lua_tostring(L, -1)); \
lua_pop(L, 1); \
} while (0)
X(prefix);
X(bin);
X(include);
X(lib);
X(src);
#undef X
return true;
}
bool init_lua_config(void) {
setup_base_dirs();
if (!init_lua_state())
return false;
if (!load_init_lua())
return false;
return true;
}
void free_lua_state(void) {
if (L != NULL) {
lua_close(L);
L = NULL;
}
L_is_loaded = false;
}
void free_lua_config(void) {
free_lua_state();
}
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