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/*
* Copyright (c) 2021, Andreas Kling <kling@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <AK/Format.h>
#include <AK/LexicalPath.h>
#include <LibCore/ArgsParser.h>
#include <LibCore/DirIterator.h>
#include <LibCore/File.h>
#include <sched.h>
#include <sys/stat.h>
static int perform_copy(const String& source, const String& destination);
static void report_error(String message);
static void report_warning(String message);
int main(int argc, char** argv)
{
String operation;
String source;
String destination;
Core::ArgsParser args_parser;
args_parser.add_positional_argument(operation, "Operation", "operation", Core::ArgsParser::Required::Yes);
args_parser.add_positional_argument(source, "Source", "source", Core::ArgsParser::Required::Yes);
args_parser.add_positional_argument(destination, "Destination", "destination", Core::ArgsParser::Required::Yes);
args_parser.parse(argc, argv);
if (operation == "Copy")
return perform_copy(source, destination);
report_warning(String::formatted("Unknown operation '{}'", operation));
return 0;
}
struct WorkItem {
enum class Type {
CreateDirectory,
CopyFile,
};
Type type;
String source;
String destination;
off_t size;
};
static void report_error(String message)
{
outln("ERROR {}", message);
}
static void report_warning(String message)
{
outln("WARN {}", message);
}
static bool collect_work_items(const String& source, const String& destination, Vector<WorkItem>& items)
{
struct stat st = {};
if (stat(source.characters(), &st) < 0) {
auto original_errno = errno;
report_error(String::formatted("stat: {}", strerror(original_errno)));
return false;
}
if (!S_ISDIR(st.st_mode)) {
// It's a file.
items.append(WorkItem {
.type = WorkItem::Type::CopyFile,
.source = source,
.destination = String::formatted("{}/{}", destination, LexicalPath(source).basename()),
.size = st.st_size,
});
return true;
}
// It's a directory.
items.append(WorkItem {
.type = WorkItem::Type::CreateDirectory,
.source = {},
.destination = String::formatted("{}/{}", destination, LexicalPath(source).basename()),
.size = 0,
});
Core::DirIterator dt(source, Core::DirIterator::SkipParentAndBaseDir);
while (dt.has_next()) {
auto name = dt.next_path();
if (!collect_work_items(
String::formatted("{}/{}", source, name),
String::formatted("{}/{}", destination, LexicalPath(source).basename()),
items)) {
return false;
}
}
return true;
}
int perform_copy(const String& source, const String& destination)
{
Vector<WorkItem> items;
if (!collect_work_items(source, destination, items))
return 1;
off_t total_bytes_to_copy = 0;
for (auto& item : items)
total_bytes_to_copy += item.size;
off_t bytes_copied_so_far = 0;
for (size_t i = 0; i < items.size(); ++i) {
auto& item = items[i];
off_t item_done = 0;
auto print_progress = [&] {
outln("PROGRESS {} {} {} {} {} {} {}", i, items.size(), bytes_copied_so_far, total_bytes_to_copy, item_done, item.size, item.source);
};
if (item.type == WorkItem::Type::CreateDirectory) {
outln("MKDIR {}", item.destination);
if (mkdir(item.destination.characters(), 0755) < 0 && errno != EEXIST) {
auto original_errno = errno;
report_error(String::formatted("mkdir: {}", strerror(original_errno)));
return 1;
}
continue;
}
VERIFY(item.type == WorkItem::Type::CopyFile);
auto source_file_or_error = Core::File::open(item.source, Core::OpenMode::ReadOnly);
if (source_file_or_error.is_error()) {
report_warning(String::formatted("Failed to open {} for reading: {}", item.source, source_file_or_error.error()));
return 1;
}
auto destination_file_or_error = Core::File::open(item.destination, (Core::OpenMode)(Core::OpenMode::WriteOnly | Core::OpenMode::Truncate));
if (destination_file_or_error.is_error()) {
report_warning(String::formatted("Failed to open {} for write: {}", item.destination, destination_file_or_error.error()));
return 1;
}
auto& source_file = *source_file_or_error.value();
auto& destination_file = *destination_file_or_error.value();
while (true) {
print_progress();
auto buffer = source_file.read(65536);
if (buffer.is_empty())
break;
if (!destination_file.write(buffer)) {
report_warning(String::formatted("Failed to write to destination file: {}", destination_file.error_string()));
return 1;
}
item_done += buffer.size();
bytes_copied_so_far += buffer.size();
print_progress();
// FIXME: Remove this once the kernel is smart enough to schedule other threads
// while we're doing heavy I/O. Right now, copying a large file will totally
// starve the rest of the system.
sched_yield();
}
print_progress();
}
outln("FINISH");
return 0;
}
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