X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/9696657f22ee2f10017c0bc305ae1843ee8fe768..64ea838d8f4d1853b7d850db93ee565e901d099a:/src/common/filename.cpp diff --git a/src/common/filename.cpp b/src/common/filename.cpp index f4d4beb7ad..17f40be930 100644 --- a/src/common/filename.cpp +++ b/src/common/filename.cpp @@ -332,6 +332,56 @@ static bool IsUNCPath(const wxString& path, wxPathFormat format) !IsDOSPathSep(path[2u]); } +#ifndef __WIN32__ + +// Under Unix-ish systems (basically everything except Windows) we may work +// either with the file itself or its target if it's a symbolic link and we +// should dereference it, as determined by wxFileName::ShouldFollowLink() and +// the absence of the wxFILE_EXISTS_NO_FOLLOW flag. StatAny() can be used to +// stat the appropriate file with an extra twist that it also works when there +// is no wxFileName object at all, as is the case in static methods. + +// Private implementation, don't call directly, use one of the overloads below. +bool DoStatAny(wxStructStat& st, wxString path, bool dereference) +{ + // We need to remove any trailing slashes from the path because they could + // interfere with the symlink following decision: even if we use lstat(), + // it would still follow the symlink if we pass it a path with a slash at + // the end because the symlink resolution would happen while following the + // path and not for the last path element itself. + + while ( wxEndsWithPathSeparator(path) ) + { + const size_t posLast = path.length() - 1; + if ( !posLast ) + { + // Don't turn "/" into empty string. + break; + } + + path.erase(posLast); + } + + int ret = dereference ? wxStat(path, &st) : wxLstat(path, &st); + return ret == 0; +} + +// Overloads to use for a case when we don't have wxFileName object and when we +// do have one. +inline +bool StatAny(wxStructStat& st, const wxString& path, int flags) +{ + return DoStatAny(st, path, !(flags & wxFILE_EXISTS_NO_FOLLOW)); +} + +inline +bool StatAny(wxStructStat& st, const wxFileName& fn) +{ + return DoStatAny(st, fn.GetFullPath(), fn.ShouldFollowLink()); +} + +#endif // !__WIN32__ + // ---------------------------------------------------------------------------- // private constants // ---------------------------------------------------------------------------- @@ -357,6 +407,7 @@ void wxFileName::Assign( const wxFileName &filepath ) m_ext = filepath.GetExt(); m_relative = filepath.m_relative; m_hasExt = filepath.m_hasExt; + m_dontFollowLinks = filepath.m_dontFollowLinks; } void wxFileName::Assign(const wxString& volume, @@ -566,6 +617,9 @@ void wxFileName::Clear() // nor any extension m_hasExt = false; + + // follow symlinks by default + m_dontFollowLinks = false; } /* static */ @@ -589,16 +643,6 @@ wxFileName wxFileName::DirName(const wxString& dir, wxPathFormat format) namespace { -// Flags for wxFileSystemObjectExists() asking it to check for: -enum -{ - wxFileSystemObject_File = 1, // file existence - wxFileSystemObject_Dir = 2, // directory existence - wxFileSystemObject_Other = 4, // existence of something else, e.g. - // device, socket, FIFO under Unix - wxFileSystemObject_Any = 7 // existence of anything at all -}; - #if defined(__WINDOWS__) && !defined(__WXMICROWIN__) void RemoveTrailingSeparatorsFromPath(wxString& strPath) @@ -623,12 +667,14 @@ void RemoveTrailingSeparatorsFromPath(wxString& strPath) #endif // __WINDOWS__ || __OS2__ -bool wxFileSystemObjectExists(const wxString& path, int flags) +bool +wxFileSystemObjectExists(const wxString& path, int flags) { + // Should the existence of file/directory with this name be accepted, i.e. // result in the true return value from this function? - const bool acceptFile = (flags & wxFileSystemObject_File) != 0; - const bool acceptDir = (flags & wxFileSystemObject_Dir) != 0; + const bool acceptFile = (flags & wxFILE_EXISTS_REGULAR) != 0; + const bool acceptDir = (flags & wxFILE_EXISTS_DIR) != 0; wxString strPath(path); @@ -676,22 +722,35 @@ bool wxFileSystemObjectExists(const wxString& path, int flags) // We consider that the path must exist if we get a sharing violation for // it but we don't know what is it in this case. if ( rc == ERROR_SHARING_VIOLATION ) - return flags & wxFileSystemObject_Other; + return flags & wxFILE_EXISTS_ANY; // Any other error (usually ERROR_PATH_NOT_FOUND), means there is nothing // there. return false; #else // Non-MSW, non-OS/2 wxStructStat st; - if ( wxStat(strPath, &st) != 0 ) + if ( !StatAny(st, strPath, flags) ) return false; if ( S_ISREG(st.st_mode) ) return acceptFile; if ( S_ISDIR(st.st_mode) ) return acceptDir; + if ( S_ISLNK(st.st_mode) ) + { + // Take care to not test for "!= 0" here as this would erroneously + // return true if only wxFILE_EXISTS_NO_FOLLOW, which is part of + // wxFILE_EXISTS_SYMLINK, is set too. + return (flags & wxFILE_EXISTS_SYMLINK) == wxFILE_EXISTS_SYMLINK; + } + if ( S_ISBLK(st.st_mode) || S_ISCHR(st.st_mode) ) + return (flags & wxFILE_EXISTS_DEVICE) != 0; + if ( S_ISFIFO(st.st_mode) ) + return (flags & wxFILE_EXISTS_FIFO) != 0; + if ( S_ISSOCK(st.st_mode) ) + return (flags & wxFILE_EXISTS_SOCKET) != 0; - return flags & wxFileSystemObject_Other; + return flags & wxFILE_EXISTS_ANY; #endif // Platforms } @@ -699,30 +758,50 @@ bool wxFileSystemObjectExists(const wxString& path, int flags) bool wxFileName::FileExists() const { - return wxFileName::FileExists( GetFullPath() ); + int flags = wxFILE_EXISTS_REGULAR; + if ( !ShouldFollowLink() ) + flags |= wxFILE_EXISTS_NO_FOLLOW; + + return wxFileSystemObjectExists(GetFullPath(), flags); } /* static */ bool wxFileName::FileExists( const wxString &filePath ) { - return wxFileSystemObjectExists(filePath, wxFileSystemObject_File); + return wxFileSystemObjectExists(filePath, wxFILE_EXISTS_REGULAR); } bool wxFileName::DirExists() const { - return wxFileName::DirExists( GetPath() ); + int flags = wxFILE_EXISTS_DIR; + if ( !ShouldFollowLink() ) + flags |= wxFILE_EXISTS_NO_FOLLOW; + + return Exists(GetPath(), flags); } /* static */ bool wxFileName::DirExists( const wxString &dirPath ) { - return wxFileSystemObjectExists(dirPath, wxFileSystemObject_Dir); + return wxFileSystemObjectExists(dirPath, wxFILE_EXISTS_DIR); +} + +bool wxFileName::Exists(int flags) const +{ + // Notice that wxFILE_EXISTS_NO_FOLLOW may be specified in the flags even + // if our DontFollowLink() hadn't been called and we do honour it then. But + // if the user took the care of calling DontFollowLink(), it is always + // taken into account. + if ( !ShouldFollowLink() ) + flags |= wxFILE_EXISTS_NO_FOLLOW; + + return wxFileSystemObjectExists(GetFullPath(), flags); } /* static */ -bool wxFileName::Exists(const wxString& path) +bool wxFileName::Exists(const wxString& path, int flags) { - return wxFileSystemObjectExists(path, wxFileSystemObject_Any); + return wxFileSystemObjectExists(path, flags); } // ---------------------------------------------------------------------------- @@ -1341,6 +1420,20 @@ bool wxFileName::Rmdir(const wxString& dir, int flags) if ( flags != 0 ) // wxPATH_RMDIR_FULL or wxPATH_RMDIR_RECURSIVE #endif // !__WINDOWS__ { +#ifndef __WINDOWS__ + if ( flags & wxPATH_RMDIR_RECURSIVE ) + { + // When deleting the tree recursively, we are supposed to delete + // this directory itself even when it is a symlink -- but without + // following it. Do it here as wxRmdir() would simply follow if + // called for a symlink. + if ( wxFileName::Exists(dir, wxFILE_EXISTS_SYMLINK) ) + { + return wxRemoveFile(dir); + } + } +#endif // !__WINDOWS__ + wxString path(dir); if ( path.Last() != wxFILE_SEP_PATH ) path += wxFILE_SEP_PATH; @@ -1352,8 +1445,11 @@ bool wxFileName::Rmdir(const wxString& dir, int flags) wxString filename; - // first delete all subdirectories - bool cont = d.GetFirst(&filename, "", wxDIR_DIRS | wxDIR_HIDDEN); + // First delete all subdirectories: notice that we don't follow + // symbolic links, potentially leading outside this directory, to avoid + // unpleasant surprises. + bool cont = d.GetFirst(&filename, wxString(), + wxDIR_DIRS | wxDIR_HIDDEN | wxDIR_NO_FOLLOW); while ( cont ) { wxFileName::Rmdir(path + filename, flags); @@ -1363,8 +1459,11 @@ bool wxFileName::Rmdir(const wxString& dir, int flags) #ifndef __WINDOWS__ if ( flags & wxPATH_RMDIR_RECURSIVE ) { - // delete all files too - cont = d.GetFirst(&filename, "", wxDIR_FILES | wxDIR_HIDDEN); + // Delete all files too and, for the same reasons as above, don't + // follow symlinks which could refer to the files outside of this + // directory and just delete the symlinks themselves. + cont = d.GetFirst(&filename, wxString(), + wxDIR_FILES | wxDIR_HIDDEN | wxDIR_NO_FOLLOW); while ( cont ) { ::wxRemoveFile(path + filename); @@ -1779,8 +1878,7 @@ bool wxFileName::SameAs(const wxFileName& filepath, wxPathFormat format) const #if defined(__UNIX__) wxStructStat st1, st2; - if ( wxStat(fn1.GetFullPath(), &st1) == 0 && - wxStat(fn2.GetFullPath(), &st2) == 0 ) + if ( StatAny(st1, fn1) && StatAny(st2, fn2) ) { if ( st1.st_ino == st2.st_ino && st1.st_dev == st2.st_dev ) return true; @@ -2647,7 +2745,7 @@ bool wxFileName::GetTimes(wxDateTime *dtAccess, #elif defined(__UNIX_LIKE__) || defined(__WXMAC__) || defined(__OS2__) || (defined(__DOS__) && defined(__WATCOMC__)) // no need to test for IsDir() here wxStructStat stBuf; - if ( wxStat( GetFullPath(), &stBuf) == 0 ) + if ( StatAny(stBuf, *this) ) { // Android defines st_*time fields as unsigned long, but time_t as long, // hence the static_casts.