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

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#include <sstream>
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#include <cstring>
#include <cerrno>
#include <sys/wait.h>
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#include <sys/stat.h>
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#include <vector>
#include <functional>
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#include <algorithm>
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#include <libreborn/libreborn.h>
#include "../bootstrap.h"
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// Strip Feature Flag Default
static std::string strip_feature_flag_default(std::string flag, bool *default_ret) {
// Valid Values
std::string true_str = "TRUE ";
std::string false_str = "FALSE ";
// Test
if (flag.rfind(true_str, 0) == 0) {
// Enabled By Default
if (default_ret != NULL) {
*default_ret = true;
}
return flag.substr(true_str.length(), std::string::npos);
} else if (flag.rfind(false_str, 0) == 0) {
// Disabled By Default
if (default_ret != NULL) {
*default_ret = false;
}
return flag.substr(false_str.length(), std::string::npos);
} else {
// Invalid
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ERR("Invalid Feature Flag Default");
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}
}
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// Load Available Feature Flags
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extern unsigned char available_feature_flags[];
extern unsigned int available_feature_flags_len;
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static void load_available_feature_flags(std::function<void(std::string)> callback) {
// Get Path
char *binary_directory = get_binary_directory();
std::string path = std::string(binary_directory) + "/available-feature-flags";
free(binary_directory);
// Load File
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std::string data(available_feature_flags, available_feature_flags + available_feature_flags_len);
std::stringstream stream(data);
// Store Lines
std::vector<std::string> lines;
// Read File
{
std::string line;
while (std::getline(stream, line)) {
if (line.length() > 0) {
// Verify Line
if (line.find('|') == std::string::npos) {
lines.push_back(line);
} else {
// Invalid Line
ERR("Feature Flag Contains Invalid '|'");
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}
}
}
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}
// Sort
std::sort(lines.begin(), lines.end(), [](std::string a, std::string b) {
// Strip Defaults
std::string stripped_a = strip_feature_flag_default(a, NULL);
std::string stripped_b = strip_feature_flag_default(b, NULL);
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// Sort
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return stripped_a < stripped_b;
});
// Run Callbacks
for (std::string &line : lines) {
callback(line);
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}
}
// Run Command And Set Environmental Variable
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static void run_command_and_set_env(const char *env_name, const char *command[]) {
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// Only Run If Environmental Variable Is NULL
if (getenv(env_name) == NULL) {
// Run
int return_code;
char *output = run_command(command, &return_code);
if (output != NULL) {
// Trim
int length = strlen(output);
if (output[length - 1] == '\n') {
output[length - 1] = '\0';
}
// Set
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set_and_print_env(env_name, output);
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// Free
free(output);
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}
// Check Return Code
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if (!is_exit_status_success(return_code)) {
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INFO("Launch Interrupted");
exit(EXIT_SUCCESS);
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}
}
}
// Use Zenity To Set Environmental Variable
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#define DIALOG_TITLE "Launcher"
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static void run_zenity_and_set_env(const char *env_name, std::vector<std::string> command) {
// Create Full Command
std::vector<std::string> full_command;
full_command.push_back("zenity");
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full_command.push_back("--title");
full_command.push_back(DIALOG_TITLE);
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full_command.push_back("--name");
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full_command.push_back(MCPI_APP_TITLE);
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full_command.insert(full_command.end(), command.begin(), command.end());
// Convert To C Array
const char *full_command_array[full_command.size() + 1];
for (std::vector<std::string>::size_type i = 0; i < full_command.size(); i++) {
full_command_array[i] = full_command[i].c_str();
}
full_command_array[full_command.size()] = NULL;
// Run
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run_command_and_set_env(env_name, full_command_array);
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}
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// Set Variable If Not Already Set
static void set_env_if_unset(const char *env_name, std::function<std::string()> callback) {
if (getenv(env_name) == NULL) {
char *value = strdup(callback().c_str());
ALLOC_CHECK(value);
set_and_print_env(env_name, value);
free(value);
}
}
// Defaults
#define DEFAULT_USERNAME "StevePi"
#define DEFAULT_RENDER_DISTANCE "Short"
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// Launch
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#define LIST_DIALOG_SIZE "400"
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int main(int argc, char *argv[]) {
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// Don't Run As Root
if (getuid() == 0 || geteuid() == 0) {
ERR("Don't Run As Root");
}
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// Pre-Bootstrap
pre_bootstrap(argc, argv);
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// Print Features
for (int i = 1; i < argc; i++) {
if (strcmp(argv[i], "--print-available-feature-flags") == 0) {
// Print Available Feature Flags
load_available_feature_flags([](std::string line) {
printf("%s\n", line.c_str());
fflush(stdout);
});
return 0;
}
}
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// --default
for (int i = 1; i < argc; i++) {
if (strcmp(argv[i], "--default") == 0) {
// Use Default Feature Flags
set_env_if_unset("MCPI_FEATURE_FLAGS", []() {
std::string feature_flags = "";
load_available_feature_flags([&feature_flags](std::string flag) {
bool default_value;
// Strip Default Value
std::string stripped_flag = strip_feature_flag_default(flag, &default_value);
// Specify Default Value
if (default_value) {
// Enabled By Default
feature_flags += stripped_flag + '|';
}
});
if (feature_flags.length() > 0 && feature_flags[feature_flags.length() - 1] == '|') {
feature_flags.pop_back();
}
return feature_flags;
});
set_env_if_unset("MCPI_RENDER_DISTANCE", []() {
return DEFAULT_RENDER_DISTANCE;
});
set_env_if_unset("MCPI_USERNAME", []() {
return DEFAULT_USERNAME;
});
break;
}
}
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// Create ~/.minecraft-pi If Needed
// Minecraft Folder
{
char *minecraft_folder = NULL;
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safe_asprintf(&minecraft_folder, "%s/.minecraft-pi", getenv("HOME"));
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{
// Check Minecraft Folder
struct stat obj;
if (stat(minecraft_folder, &obj) != 0 || !S_ISDIR(obj.st_mode)) {
// Create Minecraft Folder
int ret = mkdir(minecraft_folder, S_IRWXU | S_IRWXG | S_IROTH | S_IXOTH);
if (ret != 0) {
// Unable To Create Folder
ERR("Error Creating Directory: %s: %s", minecraft_folder, strerror(errno));
}
}
}
free(minecraft_folder);
}
// Setup MCPI_FEATURE_FLAGS
{
std::vector<std::string> command;
command.push_back("--list");
command.push_back("--checklist");
command.push_back("--width");
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command.push_back(LIST_DIALOG_SIZE);
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command.push_back("--height");
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command.push_back(LIST_DIALOG_SIZE);
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command.push_back("--column");
command.push_back("Enabled");
command.push_back("--column");
command.push_back("Feature");
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load_available_feature_flags([&command](std::string flag) {
bool default_value;
// Strip Default Value
std::string stripped_flag = strip_feature_flag_default(flag, &default_value);
// Specify Default Value
if (default_value) {
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// Enabled By Default
command.push_back("TRUE");
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} else {
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// Disabled By Default
command.push_back("FALSE");
}
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// Specify Name
command.push_back(stripped_flag);
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});
// Run
run_zenity_and_set_env("MCPI_FEATURE_FLAGS", command);
}
// Setup MCPI_RENDER_DISTANCE
{
std::vector<std::string> command;
command.push_back("--list");
command.push_back("--radiolist");
command.push_back("--width");
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command.push_back(LIST_DIALOG_SIZE);
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command.push_back("--height");
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command.push_back(LIST_DIALOG_SIZE);
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command.push_back("--text");
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command.push_back("Select Minecraft Render Distance:");
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command.push_back("--column");
command.push_back("Selected");
command.push_back("--column");
command.push_back("Name");
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std::string render_distances[] = {"Far", "Normal", "Short", "Tiny"};
for (std::string &render_distance : render_distances) {
command.push_back(render_distance.compare(DEFAULT_RENDER_DISTANCE) == 0 ? "TRUE" : "FALSE");
command.push_back(render_distance);
}
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// Run
run_zenity_and_set_env("MCPI_RENDER_DISTANCE", command);
}
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// Setup MCPI_USERNAME
{
std::vector<std::string> command;
command.push_back("--entry");
command.push_back("--text");
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command.push_back("Enter Minecraft Username:");
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command.push_back("--entry-text");
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command.push_back(DEFAULT_USERNAME);
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// Run
run_zenity_and_set_env("MCPI_USERNAME", command);
}
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// Bootstrap
bootstrap(argc, argv);
}