X-Git-Url: https://git.saurik.com/apt.git/blobdiff_plain/4c6cf49317769725fee34a132c52ec1fe076b8b5..dd6da7d2392e2ad35c444ebc2d7bc2308380530c:/apt-pkg/contrib/fileutl.h diff --git a/apt-pkg/contrib/fileutl.h b/apt-pkg/contrib/fileutl.h index cde288ad2..cddfe2b45 100644 --- a/apt-pkg/contrib/fileutl.h +++ b/apt-pkg/contrib/fileutl.h @@ -22,81 +22,147 @@ #define PKGLIB_FILEUTL_H #include +#include #include #include +#include +#include #include +#ifndef APT_8_CLEANER_HEADERS +using std::string; +#endif + /* Define this for python-apt */ #define APT_HAS_GZIP 1 -using std::string; - +class FileFdPrivate; class FileFd { protected: int iFd; enum LocalFlags {AutoClose = (1<<0),Fail = (1<<1),DelOnFail = (1<<2), - HitEof = (1<<3), Replace = (1<<4) }; + HitEof = (1<<3), Replace = (1<<4), Compressed = (1<<5) }; unsigned long Flags; - string FileName; - string TemporaryFileName; - gzFile gz; + std::string FileName; + std::string TemporaryFileName; public: - enum OpenMode {ReadOnly,WriteEmpty,WriteExists,WriteAny,WriteTemp,ReadOnlyGzip, - WriteAtomic}; + enum OpenMode { + ReadOnly = (1 << 0), + WriteOnly = (1 << 1), + ReadWrite = ReadOnly | WriteOnly, + + Create = (1 << 2), + Exclusive = (1 << 3), + Atomic = Exclusive | (1 << 4), + Empty = (1 << 5), + + WriteEmpty = ReadWrite | Create | Empty, + WriteExists = ReadWrite, + WriteAny = ReadWrite | Create, + WriteTemp = ReadWrite | Create | Exclusive, + ReadOnlyGzip, + WriteAtomic = ReadWrite | Create | Atomic + }; + enum CompressMode { Auto = 'A', None = 'N', Extension = 'E', Gzip = 'G', Bzip2 = 'B', Lzma = 'L', Xz = 'X' }; - inline bool Read(void *To,unsigned long Size,bool AllowEof) + inline bool Read(void *To,unsigned long long Size,bool AllowEof) { - unsigned long Jnk; + unsigned long long Jnk; if (AllowEof) return Read(To,Size,&Jnk); return Read(To,Size); } - bool Read(void *To,unsigned long Size,unsigned long *Actual = 0); - bool Write(const void *From,unsigned long Size); - bool Seek(unsigned long To); - bool Skip(unsigned long To); - bool Truncate(unsigned long To); - unsigned long Tell(); - unsigned long Size(); - unsigned long FileSize(); - bool Open(string FileName,OpenMode Mode,unsigned long Perms = 0666); - bool OpenDescriptor(int Fd, OpenMode Mode, bool AutoClose=false); + bool Read(void *To,unsigned long long Size,unsigned long long *Actual = 0); + char* ReadLine(char *To, unsigned long long const Size); + bool Write(const void *From,unsigned long long Size); + bool static Write(int Fd, const void *From, unsigned long long Size); + bool Seek(unsigned long long To); + bool Skip(unsigned long long To); + bool Truncate(unsigned long long To); + unsigned long long Tell(); + // the size of the file content (compressed files will be uncompressed first) + unsigned long long Size(); + // the size of the file itself + unsigned long long FileSize(); + time_t ModificationTime(); + + /* You want to use 'unsigned long long' if you are talking about a file + to be able to support large files (>2 or >4 GB) properly. + This shouldn't happen all to often for the indexes, but deb's might be… + And as the auto-conversation converts a 'unsigned long *' to a 'bool' + instead of 'unsigned long long *' we need to provide this explicitely - + otherwise applications magically start to fail… */ + bool Read(void *To,unsigned long long Size,unsigned long *Actual) APT_DEPRECATED + { + unsigned long long R; + bool const T = Read(To, Size, &R); + *Actual = R; + return T; + } + + bool Open(std::string FileName,unsigned int const Mode,CompressMode Compress,unsigned long const AccessMode = 0666); + bool Open(std::string FileName,unsigned int const Mode,APT::Configuration::Compressor const &compressor,unsigned long const AccessMode = 0666); + inline bool Open(std::string const &FileName,unsigned int const Mode, unsigned long const AccessMode = 0666) { + return Open(FileName, Mode, None, AccessMode); + }; + bool OpenDescriptor(int Fd, unsigned int const Mode, CompressMode Compress, bool AutoClose=false); + bool OpenDescriptor(int Fd, unsigned int const Mode, APT::Configuration::Compressor const &compressor, bool AutoClose=false); + inline bool OpenDescriptor(int Fd, unsigned int const Mode, bool AutoClose=false) { + return OpenDescriptor(Fd, Mode, None, AutoClose); + }; bool Close(); bool Sync(); // Simple manipulators inline int Fd() {return iFd;}; - inline void Fd(int fd) {iFd = fd;}; - inline gzFile gzFd() {return gz;}; + inline void Fd(int fd) { OpenDescriptor(fd, ReadWrite);}; + gzFile gzFd() APT_DEPRECATED APT_PURE; + inline bool IsOpen() {return iFd >= 0;}; inline bool Failed() {return (Flags & Fail) == Fail;}; inline void EraseOnFailure() {Flags |= DelOnFail;}; inline void OpFail() {Flags |= Fail;}; inline bool Eof() {return (Flags & HitEof) == HitEof;}; - inline string &Name() {return FileName;}; - - FileFd(string FileName,OpenMode Mode,unsigned long Perms = 0666) : iFd(-1), - Flags(0), gz(NULL) - { - Open(FileName,Mode,Perms); - }; - FileFd(int Fd = -1) : iFd(Fd), Flags(AutoClose), gz(NULL) {}; - FileFd(int Fd,bool) : iFd(Fd), Flags(0), gz(NULL) {}; + inline bool IsCompressed() {return (Flags & Compressed) == Compressed;}; + inline std::string &Name() {return FileName;}; + + FileFd(std::string FileName,unsigned int const Mode,unsigned long AccessMode = 0666); + FileFd(std::string FileName,unsigned int const Mode, CompressMode Compress, unsigned long AccessMode = 0666); + FileFd(); + FileFd(int const Fd, unsigned int const Mode = ReadWrite, CompressMode Compress = None); + FileFd(int const Fd, bool const AutoClose); virtual ~FileFd(); + + private: + FileFdPrivate * d; + APT_HIDDEN FileFd & operator=(const FileFd &); + APT_HIDDEN bool OpenInternDescriptor(unsigned int const Mode, APT::Configuration::Compressor const &compressor); + + // private helpers to set Fail flag and call _error->Error + APT_HIDDEN bool FileFdErrno(const char* Function, const char* Description,...) APT_PRINTF(3) APT_COLD; + APT_HIDDEN bool FileFdError(const char* Description,...) APT_PRINTF(2) APT_COLD; }; bool RunScripts(const char *Cnf); bool CopyFile(FileFd &From,FileFd &To); -int GetLock(string File,bool Errors = true); -bool FileExists(string File); -bool RealFileExists(string File); -bool DirectoryExists(string const &Path) __attrib_const; -bool CreateDirectory(string const &Parent, string const &Path); +int GetLock(std::string File,bool Errors = true); +bool FileExists(std::string File); +bool RealFileExists(std::string File); +bool DirectoryExists(std::string const &Path) APT_CONST; +bool CreateDirectory(std::string const &Parent, std::string const &Path); +time_t GetModificationTime(std::string const &Path); +bool Rename(std::string From, std::string To); + +std::string GetTempDir(); +std::string GetTempDir(std::string const &User); +FileFd* GetTempFile(std::string const &Prefix = "", + bool ImmediateUnlink = true, + FileFd * const TmpFd = NULL); /** \brief Ensure the existence of the given Path * @@ -104,24 +170,74 @@ bool CreateDirectory(string const &Parent, string const &Path); * /apt/ will be removed before CreateDirectory call. * \param Path which should exist after (successful) call */ -bool CreateAPTDirectoryIfNeeded(string const &Parent, string const &Path); +bool CreateAPTDirectoryIfNeeded(std::string const &Parent, std::string const &Path); -std::vector GetListOfFilesInDir(string const &Dir, string const &Ext, +std::vector GetListOfFilesInDir(std::string const &Dir, std::string const &Ext, bool const &SortList, bool const &AllowNoExt=false); -std::vector GetListOfFilesInDir(string const &Dir, std::vector const &Ext, +std::vector GetListOfFilesInDir(std::string const &Dir, std::vector const &Ext, bool const &SortList); -string SafeGetCWD(); +std::vector GetListOfFilesInDir(std::string const &Dir, bool SortList); +std::string SafeGetCWD(); void SetCloseExec(int Fd,bool Close); void SetNonBlock(int Fd,bool Block); bool WaitFd(int Fd,bool write = false,unsigned long timeout = 0); pid_t ExecFork(); +pid_t ExecFork(std::set keep_fds); +void MergeKeepFdsFromConfiguration(std::set &keep_fds); bool ExecWait(pid_t Pid,const char *Name,bool Reap = false); +// check if the given file starts with a PGP cleartext signature +bool StartsWithGPGClearTextSignature(std::string const &FileName); + +/** change file attributes to requested known good values + * + * The method skips the user:group setting if not root. + * + * @param requester is printed as functionname in error cases + * @param file is the file to be modified + * @param user is the (new) owner of the file, e.g. _apt + * @param group is the (new) group owning the file, e.g. root + * @param mode is the access mode of the file, e.g. 0644 + */ +bool ChangeOwnerAndPermissionOfFile(char const * const requester, char const * const file, char const * const user, char const * const group, mode_t const mode); + +/** + * \brief Drop privileges + * + * Drop the privileges to the user _apt (or the one specified in + * APT::Sandbox::User). This does not set the supplementary group + * ids up correctly, it only uses the default group. Also prevent + * the process from gaining any new privileges afterwards, at least + * on Linux. + * + * \return true on success, false on failure with _error set + */ +bool DropPrivileges(); + // File string manipulators -string flNotDir(string File); -string flNotFile(string File); -string flNoLink(string File); -string flExtension(string File); -string flCombine(string Dir,string File); +std::string flNotDir(std::string File); +std::string flNotFile(std::string File); +std::string flNoLink(std::string File); +std::string flExtension(std::string File); +std::string flCombine(std::string Dir,std::string File); + +/** \brief Takes a file path and returns the absolute path + */ +std::string flAbsPath(std::string File); + +// simple c++ glob +std::vector Glob(std::string const &pattern, int flags=0); + +/** \brief Popen() implementation that execv() instead of using a shell + * + * \param Args the execv style command to run + * \param FileFd is a referenz to the FileFd to use for input or output + * \param Child a reference to the integer that stores the child pid + * Note that you must call ExecWait() or similar to cleanup + * \param Mode is either FileFd::ReadOnly or FileFd::WriteOnly + * \return true on success, false on failure with _error set + */ +bool Popen(const char* Args[], FileFd &Fd, pid_t &Child, FileFd::OpenMode Mode); + #endif