public static bool MakeExecutable(string filePath, bool throwOnError = true)
{
if (String.IsNullOrEmpty(filePath))
{
throw new ArgumentException("must not be null or empty", nameof(filePath));
}
if (!File.Exists(filePath))
{
Log.WarningLine($"Script {filePath} does not exist");
return(true);
}
int ret = Syscall.chmod(filePath,
FilePermissions.S_IRGRP | FilePermissions.S_IXGRP |
FilePermissions.S_IROTH | FilePermissions.S_IXOTH |
FilePermissions.S_IRUSR | FilePermissions.S_IXUSR | FilePermissions.S_IWUSR
);
if (ret == 0)
{
return(true);
}
string message = $"Failed to make {filePath} executable: {Stdlib.strerror (Stdlib.GetLastError ())}";
if (throwOnError)
{
throw new InvalidOperationException(message);
}
Log.WarningLine(message);
return(false);
}
partial void MakeExecutable(string scriptPath)
{
if (String.IsNullOrEmpty(scriptPath))
{
throw new ArgumentException("must not be null or empty", nameof(scriptPath));
}
if (!File.Exists(scriptPath))
{
Log.WarningLine($"Script {scriptPath} does not exist");
return;
}
int ret = Syscall.chmod(scriptPath,
FilePermissions.S_IRGRP | FilePermissions.S_IXGRP |
FilePermissions.S_IROTH | FilePermissions.S_IXOTH |
FilePermissions.S_IRUSR | FilePermissions.S_IXUSR | FilePermissions.S_IWUSR
);
if (ret == 0)
{
return;
}
Log.ErrorLine($"Failed to make {scriptPath} executable: {Stdlib.strerror (Stdlib.GetLastError ())}");
throw new InvalidOperationException("Failed");
}
protected static bool IsExecutable(string fullPath, bool throwOnErrors = false)
{
Stat sbuf;
int ret = Syscall.stat(fullPath, out sbuf);
if (ret < 0)
{
if (throwOnErrors)
{
throw new InvalidOperationException($"Failed to stat file '{fullPath}': {Stdlib.strerror (Stdlib.GetLastError ())}");
}
return(false);
}
if ((sbuf.st_mode & ExecutableBits) == 0)
{
if (throwOnErrors)
{
throw new InvalidOperationException($"File '{fullPath}' is not executable");
}
return(false);
}
return(true);
}
public override unsafe int Read(Span <byte> data)
{
if (data.IsEmpty)
{
return(0);
}
long ret;
lock (_lock)
{
while (true)
{
fixed(byte *p = data)
{
while ((ret = Syscall.read(Handle, p, (ulong)data.Length)) == -1 &&
Stdlib.GetLastError() == Errno.EINTR)
{
// Retry in case we get interrupted by a signal.
}
if (ret != -1)
{
break;
}
var err = Stdlib.GetLastError();
// The descriptor was probably redirected to a program that ended. Just
// silently ignore this situation.
//
// The strange condition where errno is zero happens e.g. on Linux if
// the process is killed while blocking in the read system call.
if (err == 0 || err == Errno.EPIPE)
{
ret = 0;
break;
}
// The file descriptor has been configured as non-blocking. Instead of
// busily trying to read over and over, poll until we can write and then
// try again.
if (err == Errno.EAGAIN)
{
_ = Syscall.poll(new[]
{
new Pollfd
{
fd = Handle,
events = PollEvents.POLLIN,
},
}, 1, Timeout.Infinite);
continue;
}
if (err == 0)
{
err = Errno.EBADF;
}
throw new TerminalException(
$"Could not read from standard {_name}: {Stdlib.strerror(err)}");
}
}
}
return((int)ret);
}
protected BaseSharedMemory(bool allowCreate, Type type, bool oneSide)
{
HalftoneBuffer = new IntPtr[2];
BinBuffer = new IntPtr[2];
ShmType = type;
BufferSize = Marshal.SizeOf(ShmType);
shmid = shmget(SHMKEY, 0, 0);
Errno errno = Stdlib.GetLastError();
if (shmid == -1)
{
if (allowCreate)
{
shmid = shmget(SHMKEY, BufferSize, SHM_PERMISSION | IPC_CREAT | IPC_EXCL);
errno = Stdlib.GetLastError();
if (shmid == -1)
{
throw new Exception(string.Format(NoSharedMemory, BufferSize, "shmget-new", errno, Stdlib.strerror(errno)));
}
}
else
{
throw new Exception(string.Format(NoSharedMemory, BufferSize, "shmget", errno, Stdlib.strerror(errno)));
}
}
ptr = shmat(shmid, 0, 0);
errno = Stdlib.GetLastError();
if (ptr == -1)
{
throw new Exception(string.Format(NoSharedMemory, BufferSize, "shmat", errno, Stdlib.strerror(errno)));
}
BinBuffer[0] = GetDataPointer("oneSideBin");
HalftoneBuffer[0] = GetDataPointer("oneSide");
if (oneSide)
{
BinBuffer[1] = BinBuffer[0];
HalftoneBuffer[1] = HalftoneBuffer[0];
}
else
{
BinBuffer[1] = GetDataPointer("twoSideBin");
HalftoneBuffer[1] = GetDataPointer("twoSide");
}
}
/// <summary>
/// Moves file from <paramref name="sourcePath"/> to <paramref name="destinationPath"/> the same way <see
/// cref="System.IO.File.Move"/> does but it checks whether the file pointed to by <paramref
/// name="sourcePath"/> is a dangling symlink and, if yes, it does not call <see cref="System.IO.File.Move"/>
/// but instead uses <c>readlink(2)</c> and <c>symlink(2)</c> to recreate the symlink at the destination. This
/// is to work around a bug in Mono 6 series which will throw an exception when trying to move a dangling
/// symlink.
/// </summary>
public static void FileMove(string sourcePath, string destinationPath)
{
if (String.IsNullOrEmpty(sourcePath))
{
throw new ArgumentException("must not be null or empty", nameof(sourcePath));
}
if (String.IsNullOrEmpty(destinationPath))
{
throw new ArgumentException("must not be null or empty", nameof(destinationPath));
}
int ret = Syscall.lstat(sourcePath, out Stat sbuf);
if (ret != 0 || (ret == 0 && (sbuf.st_mode & FilePermissions.S_IFLNK) != FilePermissions.S_IFLNK))
{
// Not a symlink or an error, just call to the BCL and let it handle both situations
File.Move(sourcePath, destinationPath);
return;
}
// Source is a symlink
ret = Syscall.stat(sourcePath, out sbuf);
if (ret < 0)
{
Log.DebugLine($"stat on {sourcePath} returned {ret}. Errno: {Stdlib.GetLastError ()}");
}
if (!FileIsDanglingSymlink(sourcePath))
{
// let BCL handle it
File.Move(sourcePath, destinationPath);
return;
}
Log.DebugLine($"Moving a dangling symlink from {sourcePath} to {destinationPath}");
// We have a dangling symlink, we'll just recreate it at the destination and remove the source
var sb = new StringBuilder(checked ((int)sbuf.st_size));
ret = Syscall.readlink(sourcePath, sb);
if (ret < 0)
{
throw new IOException($"Failed to read a symbolic link '{sourcePath}'. {Stdlib.strerror (Stdlib.GetLastError ())}");
}
string sourceLinkContents = sb.ToString();
Log.DebugLine($"Source symlink {sourcePath} points to: {sourceLinkContents}");
ret = Syscall.symlink(sourceLinkContents, destinationPath);
if (ret < 0)
{
throw new IOException($"Failed to create a symbolic link '{destinationPath}' -> '{sourceLinkContents}'. {Stdlib.strerror (Stdlib.GetLastError ())}");
}
}
public FsException(Errno errnum, Exception?innerException = null) :
base(Stdlib.strerror(errnum), innerException)
{
}
public FsException(string message, string path, Errno errnum, Exception?innerException = null) :
base($"{message}. {path}: {Stdlib.strerror(errnum)}", innerException)
{
}
private static string strerror(Errno errno)
{
return(Stdlib.strerror(errno));
}
