ciopfs.hpp

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#pragma once
 
#include <filesystem>
#include <unistd.h>
 
#include "../lib/subprocess.hpp"
#include "../lib/env.hpp"
#include "../std/filesystem.hpp"
#include "filesystem.hpp"

namespace ns_filesystems::ns_ciopfs
{
 
 
namespace
{
 
namespace fs = std::filesystem;
 
} // namespace

class Ciopfs final : public ns_filesystem::Filesystem
{
  private:
    fs::path m_path_dir_upper;

    fs::path m_path_dir_lower;
 
  public:
    Ciopfs(pid_t pid_to_die_for
      , fs::path const& path_dir_lower
      , fs::path const& path_dir_upper
      , fs::path const& path_file_log);
    Value<void> mount() override;
};

inline Ciopfs::Ciopfs(pid_t pid_to_die_for
  , fs::path const& path_dir_lower
  , fs::path const& path_dir_upper
  , fs::path const& path_file_log
)
  : ns_filesystem::Filesystem(pid_to_die_for, path_dir_upper, path_file_log)
  , m_path_dir_upper(path_dir_upper)
  , m_path_dir_lower(path_dir_lower)
{
  this->mount().discard("E::Could not mount ciopfs filesystem from '{}' to '{}'", path_dir_lower, path_dir_upper);
}

inline Value<void> Ciopfs::mount()
{
  // Validate directories
  Pop(ns_fs::create_directories(m_path_dir_lower), "E::Failed to create lower directory");
  Pop(ns_fs::create_directories(m_path_dir_upper), "E::Failed to create upper directory");
  // Find Ciopfs
  auto path_file_ciopfs = Pop(ns_env::search_path("ciopfs"), "E::Could not find ciopfs in PATH");
  // Include arguments and spawn process
  m_child = ns_subprocess::Subprocess(path_file_ciopfs)
    .with_args(m_path_dir_lower, m_path_dir_upper)
    .with_die_on_pid(m_pid_to_die_for)
    .with_stdio(ns_subprocess::Stream::Pipe)
    .with_log_file(m_path_file_log)
    .spawn();
  // Wait for mount
  ns_fuse::wait_fuse(m_path_dir_upper);
  return {};
}
 
} // namespace ns_filesystems::ns_ciopfs
 
/* vim: set expandtab fdm=marker ts=2 sw=2 tw=100 et :*/