From e7e83723e62d811fe4a40c91fbf03b02a5726308 Mon Sep 17 00:00:00 2001
From: Peter Fischer <peter@halieus.de>
Date: Sat, 16 Aug 2025 13:46:50 +0200
Subject: [PATCH] Program-Options

---
 CMakeLists.txt |  2 +-
 main.cpp       | 56 +++++++++++++++++++++++++++++++++++++++++++++-----
 2 files changed, 52 insertions(+), 6 deletions(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index fb1e429..7c1c79a 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -4,5 +4,5 @@ project(zfsbackupcleaner VERSION 0.1.0 LANGUAGES C CXX)
 find_package(Boost COMPONENTS filesystem system date_time program_options process REQUIRED)
 
 add_executable(zfsbackupcleaner main.cpp)
-target_link_libraries(zfsbackupcleaner boost_process boost_filesystem)
+target_link_libraries(zfsbackupcleaner boost_process boost_filesystem boost_program_options)
 
diff --git a/main.cpp b/main.cpp
index fb92db9..d6e6d02 100644
--- a/main.cpp
+++ b/main.cpp
@@ -2,6 +2,10 @@
 #include <boost/date_time/posix_time/posix_time_types.hpp>
 #include <boost/date_time/posix_time/time_formatters.hpp>
 #include <boost/date_time/posix_time/time_parsers.hpp>
+#include <boost/program_options/options_description.hpp>
+#include <boost/program_options/parsers.hpp>
+#include <boost/program_options/positional_options.hpp>
+#include <boost/program_options/variables_map.hpp>
 #include <iostream>
 
 #include <boost/process.hpp>
@@ -12,10 +16,15 @@
 #include <boost/date_time/posix_time/posix_time.hpp>
 #include <set>
 
+#include <boost/program_options.hpp>
+#include <boost/filesystem.hpp>
+
 namespace bp = boost::process;
 namespace asio = boost::asio;
+namespace po = boost::program_options;
+namespace fs = boost::filesystem;
 
-bool dry_run = true;
+bool dry_run = false;
 
 template<int keep_every_x_days,int till_y_day>std::set<boost::posix_time::ptime>::reverse_iterator handle_backups_after(std::string & snapshotbase, std::set<boost::posix_time::ptime> & times, std::set<boost::posix_time::ptime>::reverse_iterator ct, boost::posix_time::ptime now)
 {
@@ -118,13 +127,51 @@ std::set<boost::posix_time::ptime>::reverse_iterator handle_backups_after_365_da
 }
 
 
-int main(int, char**){
+int main(int argc, char** argv){
     std::cout << "Hello, from zfsbackupcleaner!\n";
 
+    po::options_description options("Argumente");
+    options.add_options()
+        ("help", "Hilfe anzeigen")
+        ("dry-run,n", "Test-Modus; keine Backups entfernen")
+        ("backupsystem", po::value<std::string>(), "Computer, dessen Backups bereinigt werden sollen")
+    ;
+
+    po::positional_options_description p;
+    p.add("backupsystem", 1);
+
+    po::variables_map vm;
+    try {
+        po::store(po::command_line_parser(argc,argv).options(options).positional(p).run(), vm);
+        po::notify(vm);
+    } catch (const boost::program_options::invalid_command_line_syntax & error) {
+        std::cout << "Error parsing commandline-arguments:" << std::endl;
+        std::cout << error.what() << std::endl;
+        return -1;
+    }
+
+    if(vm.count("help") || !vm.count("backupsystem"))
+    {
+        std::cout << "Benutzung: zfsbackupcleaner [Optionen] <Backupsystem>" << std::endl << std::endl;
+        std::cout << options << std::endl;
+        return 0;
+    }
+
+    if(vm.count("dry-run"))
+        dry_run = true;
+
+    std::string backupsystem = vm["backupsystem"].as<std::string>();
+
+    if(backupsystem != "workstation" && ! fs::exists("/backup/"+backupsystem))
+    {
+        std::cout << "Für das System >" << backupsystem << "< gibt es keine Backups." << std::endl;
+        return -1;
+    }
+
     asio::io_context ctx;
     asio::readable_pipe out(ctx);
 
-    bp::process proc(ctx, bp::environment::find_executable("zfs"), {"list", "-t", "snapshot", "/backup/workstation"}, bp::process_stdio{{/* in to default*/}, out, {/* err to default */}});
+    bp::process proc(ctx, bp::environment::find_executable("zfs"), {"list", "-t", "snapshot", "/backup/"+backupsystem}, bp::process_stdio{{/* in to default*/}, out, {/* err to default */}});
 
     std::string output;
 
@@ -139,7 +186,6 @@ int main(int, char**){
 
     std::set<boost::posix_time::ptime> times;
 
-    
     std::string snapshotbase;
 
     for(std::string line; std::getline(lines, line);)
@@ -174,7 +220,7 @@ int main(int, char**){
 
     boost::posix_time::ptime now = boost::posix_time::second_clock::local_time();
 
-    std::cout << "NOW " << now << std::endl;
+    std::cout << "Gehe aus von aktueller Zeit: " << now << std::endl << std::endl;
 
     boost::posix_time::time_duration dur;