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#pragma once
///@file
#include "types.hh"
namespace nix {
/**
* An abstract class for accessing a filesystem-like structure, such
* as a (possibly remote) Nix store or the contents of a NAR file.
*/
class FSAccessor
{
public:
enum Type { tMissing, tRegular, tSymlink, tDirectory };
struct Stat
{
Type type = tMissing;
/**
* regular files only
*/
uint64_t fileSize = 0;
/**
* regular files only
*/
bool isExecutable = false; // regular files only
/**
* regular files only
*/
uint64_t narOffset = 0; // regular files only
};
virtual ~FSAccessor() { }
virtual Stat stat(const Path & path) = 0;
virtual StringSet readDirectory(const Path & path) = 0;
/**
* Read a file inside the store.
*
* If `requireValidPath` is set to `true` (the default), the path must be
* inside a valid store path, otherwise it just needs to be physically
* present (but not necessarily properly registered)
*/
virtual std::string readFile(const Path & path, bool requireValidPath = true) = 0;
virtual std::string readLink(const Path & path) = 0;
};
}
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