private void SetUnixFileMode(SafeFileHandle?handle, string?path, UnixFileMode mode)
{
if ((mode & ~FileSystem.ValidUnixFileModes) != 0)
{
throw new ArgumentException(SR.Arg_InvalidUnixFileMode, nameof(UnixFileMode));
}
// Use ThrowNotFound to throw the appropriate exception when the file doesn't exist.
if (handle is null && path is not null)
{
EnsureCachesInitialized(path);
if (!EntryExists || IsBrokenLink)
{
FileSystemInfo.ThrowNotFound(path);
}
}
// Linux does not support link permissions.
// To have consistent cross-platform behavior we operate on the link target.
int rv = handle is not null?Interop.Sys.FChMod(handle, (int)mode)
: Interop.Sys.ChMod(path !, (int)mode);
Interop.CheckIo(rv, path);
InvalidateCaches();
}
public static FileAttributes GetAttributes(string fullPath)
{
FileAttributes attributes = new FileInfo(fullPath, null).Attributes;
if (attributes == (FileAttributes)(-1))
{
FileSystemInfo.ThrowNotFound(fullPath);
}
return(attributes);
}
public void SetAttributes(string path, FileAttributes attributes)
{
// Validate that only flags from the attribute are being provided. This is an
// approximation for the validation done by the Win32 function.
const FileAttributes allValidFlags =
FileAttributes.Archive | FileAttributes.Compressed | FileAttributes.Device |
FileAttributes.Directory | FileAttributes.Encrypted | FileAttributes.Hidden |
FileAttributes.Hidden | FileAttributes.IntegrityStream | FileAttributes.Normal |
FileAttributes.NoScrubData | FileAttributes.NotContentIndexed | FileAttributes.Offline |
FileAttributes.ReadOnly | FileAttributes.ReparsePoint | FileAttributes.SparseFile |
FileAttributes.System | FileAttributes.Temporary;
if ((attributes & ~allValidFlags) != 0)
{
// Using constant string for argument to match historical throw
throw new ArgumentException(SR.Arg_InvalidFileAttrs, "Attributes");
}
EnsureStatInitialized(path);
if (!_exists)
{
FileSystemInfo.ThrowNotFound(path);
}
// The only thing we can reasonably change is whether the file object is readonly by changing permissions.
int newMode = _fileStatus.Mode;
if ((attributes & FileAttributes.ReadOnly) != 0)
{
// Take away all write permissions from user/group/everyone
newMode &= ~(int)(Interop.Sys.Permissions.S_IWUSR | Interop.Sys.Permissions.S_IWGRP | Interop.Sys.Permissions.S_IWOTH);
}
else if ((newMode & (int)Interop.Sys.Permissions.S_IRUSR) != 0)
{
// Give write permission to the owner if the owner has read permission
newMode |= (int)Interop.Sys.Permissions.S_IWUSR;
}
// Change the permissions on the file
if (newMode != _fileStatus.Mode)
{
Interop.CheckIo(Interop.Sys.ChMod(path, newMode), path, InitiallyDirectory);
}
_fileStatusInitialized = -1;
}
private unsafe void SetAccessOrWriteTimeCore(SafeFileHandle?handle, string?path, DateTimeOffset time, bool isAccessTime, bool checkCreationTime, bool asDirectory)
{
// This api is used to set creation time on non OSX platforms, and as a fallback for OSX platforms.
// The reason why we use it to set 'creation time' is the below comment:
// Unix provides APIs to update the last access time (atime) and last modification time (mtime).
// There is no API to update the CreationTime.
// Some platforms (e.g. Linux) don't store a creation time. On those platforms, the creation time
// is synthesized as the oldest of last status change time (ctime) and last modification time (mtime).
// We update the LastWriteTime (mtime).
// This triggers a metadata change for FileSystemWatcher NotifyFilters.CreationTime.
// Updating the mtime, causes the ctime to be set to 'now'. So, on platforms that don't store a
// CreationTime, GetCreationTime will return the value that was previously set (when that value
// wasn't in the future).
// force a refresh so that we have an up-to-date times for values not being overwritten
InvalidateCaches();
EnsureCachesInitialized(handle, path);
if (!EntryExists)
{
FileSystemInfo.ThrowNotFound(path);
}
// we use utimes()/utimensat() to set the accessTime and writeTime
Interop.Sys.TimeSpec *buf = stackalloc Interop.Sys.TimeSpec[2];
long seconds = time.ToUnixTimeSeconds();
long nanoseconds = UnixTimeSecondsToNanoseconds(time, seconds);
#if TARGET_BROWSER
buf[0].TvSec = seconds;
buf[0].TvNsec = nanoseconds;
buf[1].TvSec = seconds;
buf[1].TvNsec = nanoseconds;
#else
if (isAccessTime)
{
buf[0].TvSec = seconds;
buf[0].TvNsec = nanoseconds;
buf[1].TvSec = _fileCache.MTime;
buf[1].TvNsec = _fileCache.MTimeNsec;
}
else
{
buf[0].TvSec = _fileCache.ATime;
buf[0].TvNsec = _fileCache.ATimeNsec;
buf[1].TvSec = seconds;
buf[1].TvNsec = nanoseconds;
}
#endif
int rv = handle is not null
? Interop.Sys.FUTimens(handle, buf)
: Interop.Sys.UTimensat(path !, buf);
Interop.CheckIo(rv, path, asDirectory);
// On OSX-like platforms, when the modification time is less than the creation time (including
// when the modification time is already less than but access time is being set), the creation
// time is set to the modification time due to the api we're currently using; this is not
// desirable behaviour since it is inconsistent with windows behaviour and is not logical to
// the programmer (ie. we'd have to document it), so these api calls revert the creation time
// when it shouldn't be set (since we're setting modification time and access time here).
// checkCreationTime is only true on OSX-like platforms.
// allowFallbackToLastWriteTime is ignored on non OSX-like platforms.
bool updateCreationTime = checkCreationTime && (_fileCache.Flags & Interop.Sys.FileStatusFlags.HasBirthTime) != 0 &&
(buf[1].TvSec < _fileCache.BirthTime || (buf[1].TvSec == _fileCache.BirthTime && buf[1].TvNsec < _fileCache.BirthTimeNsec));
InvalidateCaches();
if (updateCreationTime)
{
Interop.Error error = SetCreationTimeCore(handle, path, _fileCache.BirthTime, _fileCache.BirthTimeNsec);
if (error != Interop.Error.SUCCESS && error != Interop.Error.ENOTSUP)
{
Interop.CheckIo(error, path, asDirectory);
}
}
}
private void SetAttributes(SafeFileHandle?handle, string?path, FileAttributes attributes, bool asDirectory)
{
// Validate that only flags from the attribute are being provided. This is an
// approximation for the validation done by the Win32 function.
const FileAttributes allValidFlags =
FileAttributes.Archive | FileAttributes.Compressed | FileAttributes.Device |
FileAttributes.Directory | FileAttributes.Encrypted | FileAttributes.Hidden |
FileAttributes.IntegrityStream | FileAttributes.Normal | FileAttributes.NoScrubData |
FileAttributes.NotContentIndexed | FileAttributes.Offline | FileAttributes.ReadOnly |
FileAttributes.ReparsePoint | FileAttributes.SparseFile | FileAttributes.System |
FileAttributes.Temporary;
if ((attributes & ~allValidFlags) != 0)
{
// Using constant string for argument to match historical throw
throw new ArgumentException(SR.Arg_InvalidFileAttrs, "Attributes");
}
EnsureCachesInitialized(handle, path);
if (!EntryExists)
{
FileSystemInfo.ThrowNotFound(path);
}
if (Interop.Sys.CanSetHiddenFlag)
{
bool hidden = (attributes & FileAttributes.Hidden) != 0;
if (hidden ^ HasHiddenFlag)
{
uint flags = hidden ? _fileCache.UserFlags | (uint)Interop.Sys.UserFlags.UF_HIDDEN :
_fileCache.UserFlags & ~(uint)Interop.Sys.UserFlags.UF_HIDDEN;
int rv = handle is not null?Interop.Sys.FChflags(handle, flags) :
Interop.Sys.LChflags(path !, flags);
Interop.CheckIo(rv, path, asDirectory);
}
}
// The only thing we can reasonably change is whether the file object is readonly by changing permissions.
int oldMode = _fileCache.Mode & (int)FileSystem.ValidUnixFileModes;
int newMode = oldMode;
if ((attributes & FileAttributes.ReadOnly) != 0)
{
// Take away all write permissions from user/group/everyone
newMode &= ~(int)(UnixFileMode.UserWrite | UnixFileMode.GroupWrite | UnixFileMode.OtherWrite);
}
else if ((newMode & (int)UnixFileMode.UserRead) != 0)
{
// Give write permission to the owner if the owner has read permission
newMode |= (int)UnixFileMode.UserWrite;
}
// Change the permissions on the file
if (newMode != oldMode)
{
int rv = handle is not null?Interop.Sys.FChMod(handle, newMode) :
Interop.Sys.ChMod(path !, newMode);
Interop.CheckIo(rv, path, asDirectory);
}
InvalidateCaches();
}
internal void SetAttributes(string path, FileAttributes attributes, bool asDirectory)
{
// Validate that only flags from the attribute are being provided. This is an
// approximation for the validation done by the Win32 function.
const FileAttributes allValidFlags =
FileAttributes.Archive | FileAttributes.Compressed | FileAttributes.Device |
FileAttributes.Directory | FileAttributes.Encrypted | FileAttributes.Hidden |
FileAttributes.IntegrityStream | FileAttributes.Normal | FileAttributes.NoScrubData |
FileAttributes.NotContentIndexed | FileAttributes.Offline | FileAttributes.ReadOnly |
FileAttributes.ReparsePoint | FileAttributes.SparseFile | FileAttributes.System |
FileAttributes.Temporary;
if ((attributes & ~allValidFlags) != 0)
{
// Using constant string for argument to match historical throw
throw new ArgumentException(SR.Arg_InvalidFileAttrs, "Attributes");
}
EnsureCachesInitialized(path);
if (!EntryExists)
{
FileSystemInfo.ThrowNotFound(path);
}
if (Interop.Sys.CanSetHiddenFlag)
{
if ((attributes & FileAttributes.Hidden) != 0 && (_fileCache.UserFlags & (uint)Interop.Sys.UserFlags.UF_HIDDEN) == 0)
{
// If Hidden flag is set and cached file status does not have the flag set then set it
Interop.CheckIo(Interop.Sys.LChflags(path, (_fileCache.UserFlags | (uint)Interop.Sys.UserFlags.UF_HIDDEN)), path, asDirectory);
}
else if (HasHiddenFlag)
{
// If Hidden flag is not set and cached file status does have the flag set then remove it
Interop.CheckIo(Interop.Sys.LChflags(path, (_fileCache.UserFlags & ~(uint)Interop.Sys.UserFlags.UF_HIDDEN)), path, asDirectory);
}
}
// The only thing we can reasonably change is whether the file object is readonly by changing permissions.
int newMode = _fileCache.Mode;
if ((attributes & FileAttributes.ReadOnly) != 0)
{
// Take away all write permissions from user/group/everyone
newMode &= ~(int)(Interop.Sys.Permissions.S_IWUSR | Interop.Sys.Permissions.S_IWGRP | Interop.Sys.Permissions.S_IWOTH);
}
else if ((newMode & (int)Interop.Sys.Permissions.S_IRUSR) != 0)
{
// Give write permission to the owner if the owner has read permission
newMode |= (int)Interop.Sys.Permissions.S_IWUSR;
}
// Change the permissions on the file
if (newMode != _fileCache.Mode)
{
Interop.CheckIo(Interop.Sys.ChMod(path, newMode), path, asDirectory);
}
InvalidateCaches();
}
