minecraft-pi-reborn/launcher/src/mods.cpp

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#include <dirent.h>
#include <cerrno>
#include <sys/stat.h>
#include <unistd.h>
#include <libreborn/libreborn.h>
#include "bootstrap.h"
// Get All Mods In Folder
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static void load(std::string &ld_preload, const std::string &folder, int recursion_limit = 128);
static void handle_file(std::string &ld_preload, const std::string &file, const int recursion_limit) {
// Check Type
struct stat file_stat = {};
lstat(file.c_str(), &file_stat);
if (S_ISDIR(file_stat.st_mode)) {
// Recurse Into Directory
load(ld_preload, std::string(file) + "/", recursion_limit - 1);
} else if (S_ISLNK(file_stat.st_mode)) {
// Resolve Symlink
char *resolved_file = realpath(file.c_str(), nullptr);
ALLOC_CHECK(resolved_file);
handle_file(ld_preload, resolved_file, recursion_limit);
free(resolved_file);
} else if (S_ISREG(file_stat.st_mode)) {
// Check If File Is Accessible
const int result = access(file.c_str(), R_OK);
if (result == 0) {
// Add To LD_PRELOAD
ld_preload += file + ":";
} else if (result == -1 && errno != 0) {
// Fail
WARN("Unable To Access: %s: %s", file.c_str(), strerror(errno));
errno = 0;
}
}
}
static void load(std::string &ld_preload, const std::string &folder, const int recursion_limit) {
// Check Recursion
if (recursion_limit <= 0) {
ERR("Reached Recursion Limit While Loading Mods");
}
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// Open Folder
ensure_directory(folder.c_str());
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DIR *dp = opendir(folder.c_str());
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if (dp == nullptr) {
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// Unable To Open Folder
ERR("Error Opening Directory: %s: %s", folder.c_str(), strerror(errno));
}
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// Loop Through Folder
while (true) {
errno = 0;
const dirent *entry = readdir(dp);
if (entry != nullptr) {
// Block Pseudo-Directories
if (strcmp(entry->d_name, ".") == 0 || strcmp(entry->d_name, "..") == 0) {
continue;
}
// Get Full Name
std::string name = folder + entry->d_name;
// Handle
handle_file(ld_preload, name, recursion_limit);
} else if (errno != 0) {
// Error Reading Contents Of Folder
ERR("Error Reading Directory: %s: %s", folder.c_str(), strerror(errno));
} else {
// Done!
break;
}
}
// Close Folder
closedir(dp);
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}
// Bootstrap Mods
#define SUBDIRECTORY_FOR_MODS "/mods/"
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std::string bootstrap_mods(const std::string &binary_directory) {
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// Prepare
std::string preload = "";
// ~/.minecraft-pi/mods
{
// Get Mods Folder
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const std::string mods_folder = std::string(getenv(_MCPI_HOME_ENV)) + get_home_subdirectory_for_game_data() + SUBDIRECTORY_FOR_MODS;
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// Load Mods From ./mods
load(preload, mods_folder);
}
// Built-In Mods
{
// Get Mods Folder
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const std::string mods_folder = binary_directory + SUBDIRECTORY_FOR_MODS;
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// Load Mods From ./mods
load(preload, mods_folder);
}
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// Return
return preload;
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}