mcs/class/Mono.Posix/Mono.Unix/UnixFileSystemInfo.cs

   1 //
   2 // Mono.Unix/UnixFileSystemInfo.cs
   3 //
   4 // Authors:
   5 //   Jonathan Pryor (jonpryor@vt.edu)
   6 //
   7 // (C) 2004-2006 Jonathan Pryor
   8 //
   9 // Permission is hereby granted, free of charge, to any person obtaining
  10 // a copy of this software and associated documentation files (the
  11 // "Software"), to deal in the Software without restriction, including
  12 // without limitation the rights to use, copy, modify, merge, publish,
  13 // distribute, sublicense, and/or sell copies of the Software, and to
  14 // permit persons to whom the Software is furnished to do so, subject to
  15 // the following conditions:
  16 //
  17 // The above copyright notice and this permission notice shall be
  18 // included in all copies or substantial portions of the Software.
  19 //
  20 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  21 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  22 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  23 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  24 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  25 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  26 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  27 //
  28
  29 using System;
  30 using System.IO;
  31 using System.Text;
  32 using Mono.Unix;
  33
  34 namespace Mono.Unix {
  35
  36         public abstract class UnixFileSystemInfo
  37         {
  38                 private Native.Stat stat;
  39                 private string fullPath;
  40                 private string originalPath;
  41                 private bool valid = false;
  42
  43                 internal const FileSpecialAttributes AllSpecialAttributes =
  44                         FileSpecialAttributes.SetUserId | FileSpecialAttributes.SetGroupId |
  45                         FileSpecialAttributes.Sticky;
  46                 internal const FileTypes AllFileTypes =
  47                         FileTypes.Directory | FileTypes.CharacterDevice | FileTypes.BlockDevice |
  48                         FileTypes.RegularFile | FileTypes.Fifo | FileTypes.SymbolicLink |
  49                         FileTypes.Socket;
  50
  51                 protected UnixFileSystemInfo (string path)
  52                 {
  53                         UnixPath.CheckPath (path);
  54                         this.originalPath = path;
  55                         this.fullPath = UnixPath.GetFullPath (path);
  56                         Refresh (true);
  57                 }
  58
  59                 internal UnixFileSystemInfo (String path, Native.Stat stat)
  60                 {
  61                         this.originalPath = path;
  62                         this.fullPath = UnixPath.GetFullPath (path);
  63                         this.stat = stat;
  64                         this.valid = true;
  65                 }
  66
  67                 protected string FullPath {
  68                         get {return fullPath;}
  69                         set {
  70                                 if (fullPath != value) {
  71                                         UnixPath.CheckPath (value);
  72                                         valid = false;
  73                                         fullPath = value;
  74                                 }
  75                         }
  76                 }
  77
  78                 protected string OriginalPath {
  79                         get {return originalPath;}
  80                         set {originalPath = value;}
  81                 }
  82
  83                 private void AssertValid ()
  84                 {
  85                         Refresh (false);
  86                         if (!valid)
  87                                 throw new InvalidOperationException ("Path doesn't exist!");
  88                 }
  89
  90                 public virtual string FullName {
  91                         get {return FullPath;}
  92                 }
  93
  94                 public abstract string Name {get;}
  95
  96                 public bool Exists {
  97                         get {
  98                                 Refresh (true);
  99                                 return valid;
 100                         }
 101                 }
 102
 103                 public long Device {
 104                         get {AssertValid (); return Convert.ToInt64 (stat.st_dev);}
 105                 }
 106
 107                 public long Inode {
 108                         get {AssertValid (); return Convert.ToInt64 (stat.st_ino);}
 109                 }
 110
 111                 [CLSCompliant (false)]
 112                 public Native.FilePermissions Protection {
 113                         get {AssertValid (); return (Native.FilePermissions) stat.st_mode;}
 114                         set {
 115                                 int r = Native.Syscall.chmod (FullPath, value);
 116                                 UnixMarshal.ThrowExceptionForLastErrorIf (r);
 117                         }
 118                 }
 119
 120                 public FileTypes FileType {
 121                         get {
 122                                 AssertValid ();
 123                                 int type = (int) stat.st_mode;
 124                                 return (FileTypes) (type & (int) AllFileTypes);
 125                         }
 126                         // no set as chmod(2) won't accept changing the file type.
 127                 }
 128
 129                 public FileAccessPermissions FileAccessPermissions {
 130                         get {
 131                                 AssertValid ();
 132                                 int perms = (int) stat.st_mode;
 133                                 return (FileAccessPermissions) (perms & (int) FileAccessPermissions.AllPermissions);
 134                         }
 135                         set {
 136                                 AssertValid ();
 137                                 int perms = (int) stat.st_mode;
 138                                 perms &= (int) ~FileAccessPermissions.AllPermissions;
 139                                 perms |= (int) value;
 140                                 Protection = (Native.FilePermissions) perms;
 141                         }
 142                 }
 143
 144                 public FileSpecialAttributes FileSpecialAttributes {
 145                         get {
 146                                 AssertValid ();
 147                                 int attrs = (int) stat.st_mode;
 148                                 return (FileSpecialAttributes) (attrs & (int) AllSpecialAttributes);
 149                         }
 150                         set {
 151                                 AssertValid ();
 152                                 int perms = (int) stat.st_mode;
 153                                 perms &= (int) ~AllSpecialAttributes;
 154                                 perms |= (int) value;
 155                                 Protection = (Native.FilePermissions) perms;
 156                         }
 157                 }
 158
 159                 public long LinkCount {
 160                         get {AssertValid (); return Convert.ToInt64 (stat.st_nlink);}
 161                 }
 162
 163                 public UnixUserInfo OwnerUser {
 164                         get {AssertValid (); return new UnixUserInfo (stat.st_uid);}
 165                 }
 166
 167                 public long OwnerUserId {
 168                         get {AssertValid (); return stat.st_uid;}
 169                 }
 170
 171                 public UnixGroupInfo OwnerGroup {
 172                         get {AssertValid (); return new UnixGroupInfo (stat.st_gid);}
 173                 }
 174
 175                 public long OwnerGroupId {
 176                         get {AssertValid (); return stat.st_gid;}
 177                 }
 178
 179                 public long DeviceType {
 180                         get {AssertValid (); return Convert.ToInt64 (stat.st_rdev);}
 181                 }
 182
 183                 public long Length {
 184                         get {AssertValid (); return (long) stat.st_size;}
 185                 }
 186
 187                 public long BlockSize {
 188                         get {AssertValid (); return (long) stat.st_blksize;}
 189                 }
 190
 191                 public long BlocksAllocated {
 192                         get {AssertValid (); return (long) stat.st_blocks;}
 193                 }
 194
 195                 public DateTime LastAccessTime {
 196                         get {AssertValid (); return Native.NativeConvert.ToDateTime (stat.st_atime);}
 197                 }
 198
 199                 public DateTime LastAccessTimeUtc {
 200                         get {return LastAccessTime.ToUniversalTime ();}
 201                 }
 202
 203                 public DateTime LastWriteTime {
 204                         get {AssertValid (); return Native.NativeConvert.ToDateTime (stat.st_mtime);}
 205                 }
 206
 207                 public DateTime LastWriteTimeUtc {
 208                         get {return LastWriteTime.ToUniversalTime ();}
 209                 }
 210
 211                 public DateTime LastStatusChangeTime {
 212                         get {AssertValid (); return Native.NativeConvert.ToDateTime (stat.st_ctime);}
 213                 }
 214
 215                 public DateTime LastStatusChangeTimeUtc {
 216                         get {return LastStatusChangeTime.ToUniversalTime ();}
 217                 }
 218
 219                 public bool IsDirectory {
 220                         get {AssertValid (); return IsType (stat.st_mode, Native.FilePermissions.S_IFDIR);}
 221                 }
 222
 223                 public bool IsCharacterDevice {
 224                         get {AssertValid (); return IsType (stat.st_mode, Native.FilePermissions.S_IFCHR);}
 225                 }
 226
 227                 public bool IsBlockDevice {
 228                         get {AssertValid (); return IsType (stat.st_mode, Native.FilePermissions.S_IFBLK);}
 229                 }
 230
 231                 public bool IsRegularFile {
 232                         get {AssertValid (); return IsType (stat.st_mode, Native.FilePermissions.S_IFREG);}
 233                 }
 234
 235                 public bool IsFifo {
 236                         get {AssertValid (); return IsType (stat.st_mode, Native.FilePermissions.S_IFIFO);}
 237                 }
 238
 239                 public bool IsSymbolicLink {
 240                         get {AssertValid (); return IsType (stat.st_mode, Native.FilePermissions.S_IFLNK);}
 241                 }
 242
 243                 public bool IsSocket {
 244                         get {AssertValid (); return IsType (stat.st_mode, Native.FilePermissions.S_IFSOCK);}
 245                 }
 246
 247                 public bool IsSetUser {
 248                         get {AssertValid (); return IsType (stat.st_mode, Native.FilePermissions.S_ISUID);}
 249                 }
 250
 251                 public bool IsSetGroup {
 252                         get {AssertValid (); return IsType (stat.st_mode, Native.FilePermissions.S_ISGID);}
 253                 }
 254
 255                 public bool IsSticky {
 256                         get {AssertValid (); return IsType (stat.st_mode, Native.FilePermissions.S_ISVTX);}
 257                 }
 258
 259                 internal static bool IsType (Native.FilePermissions mode, Native.FilePermissions type)
 260                 {
 261                         return (mode & type) == type;
 262                 }
 263
 264                 [CLSCompliant (false)]
 265                 public bool CanAccess (Native.AccessModes mode)
 266                 {
 267                         int r = Native.Syscall.access (FullPath, mode);
 268                         return r == 0;
 269                 }
 270
 271                 public UnixFileSystemInfo CreateLink (string path)
 272                 {
 273                         int r = Native.Syscall.link (FullName, path);
 274                         UnixMarshal.ThrowExceptionForLastErrorIf (r);
 275                         return Create (path);
 276                 }
 277
 278                 public UnixSymbolicLinkInfo CreateSymbolicLink (string path)
 279                 {
 280                         int r = Native.Syscall.symlink (FullName, path);
 281                         UnixMarshal.ThrowExceptionForLastErrorIf (r);
 282                         return new UnixSymbolicLinkInfo (path);
 283                 }
 284
 285                 public abstract void Delete ();
 286
 287                 [CLSCompliant (false)]
 288                 public long GetConfigurationValue (Native.PathconfName name)
 289                 {
 290                         long r = Native.Syscall.pathconf (FullPath, name);
 291                         if (r == -1 && Native.Stdlib.GetLastError() != (Native.Errno) 0)
 292                                 UnixMarshal.ThrowExceptionForLastError ();
 293                         return r;
 294                 }
 295
 296                 public void Refresh ()
 297                 {
 298                         Refresh (true);
 299                 }
 300
 301                 internal void Refresh (bool force)
 302                 {
 303                         if (valid && !force)
 304                                 return;
 305                         valid = GetFileStatus (FullPath, out this.stat);
 306                 }
 307
 308                 protected virtual bool GetFileStatus (string path, out Native.Stat stat)
 309                 {
 310                         return Native.Syscall.stat (path, out stat) == 0;
 311                 }
 312
 313                 public void SetLength (long length)
 314                 {
 315                         int r;
 316                         do {
 317                                 r = Native.Syscall.truncate (FullPath, length);
 318                         }       while (UnixMarshal.ShouldRetrySyscall (r));
 319                         UnixMarshal.ThrowExceptionForLastErrorIf (r);
 320                 }
 321
 322                 public virtual void SetOwner (long owner, long group)
 323                 {
 324                         uint _owner = Convert.ToUInt32 (owner);
 325                         uint _group = Convert.ToUInt32 (group);
 326                         int r = Native.Syscall.chown (FullPath, _owner, _group);
 327                         UnixMarshal.ThrowExceptionForLastErrorIf (r);
 328                 }
 329
 330                 public void SetOwner (string owner)
 331                 {
 332                         Native.Passwd pw = Native.Syscall.getpwnam (owner);
 333                         if (pw == null)
 334                                 throw new ArgumentException (Locale.GetText ("invalid username"), "owner");
 335                         uint uid = pw.pw_uid;
 336                         uint gid = pw.pw_gid;
 337                         SetOwner ((long) uid, (long) gid);
 338                 }
 339
 340                 public void SetOwner (string owner, string group)
 341                 {
 342                         long uid = -1;
 343                         if (owner != null)
 344                                 uid = new UnixUserInfo (owner).UserId;
 345                         long gid = -1;
 346                         if (group != null)
 347                                 gid = new UnixGroupInfo (group).GroupId;
 348
 349                         SetOwner (uid, gid);
 350                 }
 351
 352                 public void SetOwner (UnixUserInfo owner)
 353                 {
 354                         long uid, gid;
 355                         uid = gid = -1;
 356                         if (owner != null) {
 357                                 uid = owner.UserId;
 358                                 gid = owner.GroupId;
 359                         }
 360                         SetOwner (uid, gid);
 361                 }
 362
 363                 public void SetOwner (UnixUserInfo owner, UnixGroupInfo group)
 364                 {
 365                         long uid, gid;
 366                         uid = gid = -1;
 367                         if (owner != null)
 368                                 uid = owner.UserId;
 369                         if (group != null)
 370                                 gid = owner.GroupId;
 371                         SetOwner (uid, gid);
 372                 }
 373
 374                 public override string ToString ()
 375                 {
 376                         return FullPath;
 377                 }
 378
 379                 public Native.Stat ToStat ()
 380                 {
 381                         AssertValid ();
 382                         return stat;
 383                 }
 384
 385                 internal static UnixFileSystemInfo Create (string path)
 386                 {
 387                         Native.Stat stat;
 388                         int r = Native.Syscall.lstat (path, out stat);
 389                         UnixMarshal.ThrowExceptionForLastErrorIf (r);
 390
 391                         if (IsType (stat.st_mode, Native.FilePermissions.S_IFDIR))
 392                                 return new UnixDirectoryInfo (path, stat);
 393                         else if (IsType (stat.st_mode, Native.FilePermissions.S_IFLNK))
 394                                 return new UnixSymbolicLinkInfo (path, stat);
 395                         return new UnixFileInfo (path, stat);
 396                 }
 397         }
 398 }
 399
 400 // vim: noexpandtab