如何使用Mono在Linux上獲取文件信息

Question

使用Mono，我想獲得有關Linux系統上文件的各種信息。

特別是，我想獲取文件屬性，文件權限，所有者以及文件是實際文件還是某種類型的鏈接。

在Windows中，我會用FileInfo.Attributes獲取文件屬性 - 但這只是返回在Linux上FileAttributes.Normal，即使lsattr命令報告----ia-------e--（例如）。

在Windows中，我將使用FileSecurity來獲取所有者和文件權限 - 但是在Linux上會出現PlatformNotSupportedException。

Answer 1

您可能需要有條件地使用Mono.Unix中的類，特別是UnixFileInfo，具體取決於Environment.OSVersion.Platform。

Answer 2

我有同樣的要求，不得不由我自己破解的解決方案，希望你會喜歡它:)

using System; 
using System.Runtime.InteropServices; 

partial class FileProvider 
{ 
    private const uint IOCPARM_MASK = 0x7f; /* parameters must be < 128 bytes */ 
    private const uint IOC_VOID = 0x20000000; /* no parameters */ 
    private const uint IOC_IN = 0x40000000; /* copy out parameters */ 
    private const uint IOC_OUT = 0x80000000; /* copy in parameters */ 
    private const uint IOC_INOUT = (IOC_IN | IOC_OUT); 
    /* the 0x20000000 is so we can distinguish new ioctl's from old */ 

    private static uint _IOXXX(uint ioc, int x, int y, int l) 
    { 
     return ioc | (((uint)l & IOCPARM_MASK) << 16) | ((uint)x << 8) | (uint)y; 
    } 

    private static uint _IO(int x, int y) 
    { 
     return _IOXXX(IOC_VOID, x, y, 0); 
    } 

    private static int SizeOf<T>() 
    { 
     var type = typeof (T); 
     if (type.IsEnum) 
      return Marshal.SizeOf(type.GetEnumUnderlyingType()); 
     return Marshal.SizeOf(type); 
    } 

    private static uint _IOR<T>(int x, int y) 
    { 
     return _IOXXX(IOC_OUT, x, y, SizeOf<T>()); 
    } 

    private static uint _IOW<T>(int x, int y) 
    { 
     return _IOXXX(IOC_IN, x, y, SizeOf<T>()); 
    } 

    private static uint _IORW<T>(int x, int y) 
    { 
     return _IOXXX(IOC_INOUT, x, y, SizeOf<T>()); 
    } 

    public static uint EXT2_IOC_GETFLAGS 
    { 
     get { return _IOR<IOC_FLAGS>('f', 1); } 
    } 

    public static uint EXT2_IOC_SETFLAGS 
    { 
     get { return _IOW<IOC_FLAGS>('f', 2); } 
    } 

    [Flags] 
    private enum IOC_FLAGS : long 
    { 
     EXT2_SECRM_FL = 0x00000001, /* Secure deletion */ 
     EXT2_UNRM_FL = 0x00000002, /* Undelete */ 
     EXT2_COMPR_FL = 0x00000004, /* Compress file */ 
     EXT2_SYNC_FL = 0x00000008, /* Synchronous updates */ 
     EXT2_IMMUTABLE_FL = 0x00000010, /* Immutable file */ 
     EXT2_APPEND_FL = 0x00000020, /* writes to file may only append */ 
     EXT2_NODUMP_FL = 0x00000040, /* do not dump file */ 
     EXT2_NOATIME_FL = 0x00000080, /* do not update atime */ 
     /* Reserved for compression usage... */ 
     EXT2_DIRTY_FL = 0x00000100, 
     EXT2_COMPRBLK_FL = 0x00000200, /* One or more compressed clusters */ 
     EXT2_NOCOMPR_FL = 0x00000400, /* Access raw compressed data */ 
     EXT2_ECOMPR_FL = 0x00000800, /* Compression error */ 
     /* End compression flags --- maybe not all used */ 
     EXT2_BTREE_FL = 0x00001000, /* btree format dir */ 
     EXT2_INDEX_FL = 0x00001000, /* hash-indexed directory */ 
     EXT2_IMAGIC_FL = 0x00002000, 
     EXT3_JOURNAL_DATA_FL = 0x00004000, /* file data should be journaled */ 
     EXT2_NOTAIL_FL = 0x00008000, /* file tail should not be merged */ 
     EXT2_DIRSYNC_FL = 0x00010000, /* Synchronous directory modifications */ 
     EXT2_TOPDIR_FL = 0x00020000, /* Top of directory hierarchies*/ 
     EXT4_HUGE_FILE_FL = 0x00040000, /* Set to each huge file */ 
     EXT4_EXTENTS_FL = 0x00080000, /* Inode uses extents */ 
     EXT4_EA_INODE_FL = 0x00200000, /* Inode used for large EA */ 
     /* EXT4_EOFBLOCKS_FL 0x00400000 was here */ 
     FS_NOCOW_FL = 0x00800000, /* Do not cow file */ 
     EXT4_SNAPFILE_FL = 0x01000000, /* Inode is a snapshot */ 
     EXT4_SNAPFILE_DELETED_FL = 0x04000000, /* Snapshot is being deleted */ 
     EXT4_SNAPFILE_SHRUNK_FL = 0x08000000, /* Snapshot shrink has completed */ 
     EXT2_RESERVED_FL = 0x80000000, /* reserved for ext2 lib */ 
    } 

    [DllImport("libc", EntryPoint = "ioctl", SetLastError = true)] 
    private extern static int ioctl(int fd, uint request, ref IOC_FLAGS data); 

然後你只需要打開使用Syscall.open文件，使用FileProvider.ioctl與給定文件描述符和EXT2_IOC_GETFLAGS或EXT2_IOC_SETFLAGS（您可能需要更改一些權限，這是一個原始複製/粘貼），然後使用Syscall.close