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/* This file is part of the Spring engine (GPL v2 or later), see LICENSE.html */
#ifndef DATA_DIR_LOCATER_H
#define DATA_DIR_LOCATER_H
#include <string>
#include <vector>
struct DataDir
{
/**
* @brief construct a data directory object
*
* Appends a slash to the end of the path if there isn't one already.
*/
DataDir(const std::string& path);
std::string path;
bool writable;
};
class DataDirLocater
{
public:
static DataDirLocater& GetInstance();
static void FreeInstance();
/**
* @brief construct a data directory locater
*
* Does not locate data directories, use LocateDataDirs() for that.
*/
DataDirLocater();
/**
* @brief locate spring data directories
*
* Attempts to locate a writable data dir, and then tries to
* chdir to it.
* As the writable data dir will usually be the current dir already under
* windows, the chdir will have no effect.
*
* The first dir added will be the writable data dir.
* @see Manpage
*/
void LocateDataDirs();
/**
* @brief call after LocateDataDirs()
*/
void Check();
const std::vector<DataDir>& GetDataDirs() const;
const DataDir* GetWriteDir() const { return writeDir; }
/**
* @brief returns the highest priority writable directory, aka the writedir
*/
std::string GetWriteDirPath() const;
std::vector<std::string> GetDataDirPaths() const;
/**
* Returns whether isolation-mode is enabled.
* In isolation-mode, we will only use a singel data-dir.
* This defaults to false, but can be set to true by setting the env var
* SPRING_ISOLATED.
* @see #GetIsolationModeDir
*/
bool IsIsolationMode() const { return isolationMode; }
/**
* Determines whether we are in portable mode.
* It defines portable mode as:
* The spring binary (spring binary), the unitsync
* and springsettings.cfg are in the same directory.
*/
static bool IsPortableMode();
/**
* Sets whether isolation-mode is enabled.
* @see #IsIsolationMode
* @see #SetIsolationModeDir
*/
void SetIsolationMode(bool enabled) { isolationMode = enabled; }
/**
* Returns the isolation-mode directory, or "", if the default one is used.
* The default one is CWD or CWD/.., in case of a versioned data-dir.
* If the env var SPRING_ISOLATED is set to a valid directory,
* it replaced the above mentioned default.
* This is only relevant if isolation-mode is active.
* @see #IsIsolationMode
*/
std::string GetIsolationModeDir() const { return isolationModeDir; }
/**
* Sets the isolation-mode directory.
* If set to "", we use the default one, which is is CWD or CWD/..,
* in case of a versioned data-dir.
* This is only relevant if isolation-mode is active.
* @see #SetIsolationMode
*/
void SetIsolationModeDir(const std::string& dir) { isolationModeDir = dir; }
/**
* Force the write directory.
* If set to "", we use the default one.
*/
void SetWriteDir(const std::string& dir) { forcedWriteDir = dir; }
/**
* @brief reads envvar to detect if we should run in isolated mode
* used by unitsync.cpp
*/
void UpdateIsolationModeByEnvVar();
/**
* @brief cd's into writedir
*/
void ChangeCwdToWriteDir();
private:
void AddCurWorkDir();
void AddPortableDir();
void AddHomeDirs();
void AddEtcDirs();
void AddShareDirs();
/**
* @brief substitutes environment variables with their values
*/
std::string SubstEnvVars(const std::string& in) const;
/**
* @brief Adds the directories from a colon separated string to the data-dir
* handler.
* @param dirs colon separated string, use ';' on Windows and ':' on all
* other OSs
*/
void AddDirs(const std::string& dirs);
/**
* @brief Adds a single directory to the datadir handler.
* Will only add the directory if it was not already added,
* as lower index in the list of dirs means higher prefference,
* adding it again would be pointless.
*/
void AddDir(const std::string& dir);
/**
* @brief Figure out permissions we have for a single data directory.
* @returns whether we have permissions to read the data directory.
*/
bool DeterminePermissions(DataDir* dataDir);
/**
* @brief Figure out permissions we have for the data directories.
*/
void FilterUsableDataDirs();
bool IsWriteableDir(DataDir* dataDir);
void FindWriteableDataDir();
/**
* Determines whether a given path may be a data-dir for multiple engine
* versions.
* This is done by checking the precense of some dirs,
* like "./maps/" and "./games/".
* You may think of this as denoting multi-engine-version portable-mode.
* This will return true on a default install on windows.
* @param dirPath a path to a dir to check for whether it is a data-dir
* for multiple engine versions.
* @returns whether dirPath may be a data-dir for multiple engine versions.
*/
static bool IsInstallDirDataDir();
static bool LooksLikeMultiVersionDataDir(const std::string& dirPath);
private:
bool isolationMode;
std::string isolationModeDir;
std::string forcedWriteDir;
std::vector<DataDir> dataDirs;
const DataDir* writeDir;
};
#define dataDirLocater DataDirLocater::GetInstance()
#endif // !defined(DATA_DIR_LOCATER_H)
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