public bool ReadFsChangeBody(string path, FsChange fsChange)
{
var shebangPosition = 0;
var makeExecutable = false;
string tempPath = null;
FileStream fs = null;
bool bodyReadSuccess = false;
try
{
long written = 0;
int chunkSize;
do
{
chunkSize = ReadInt();
if (chunkSize < 0)
{
// error occurred in sender
return(false);
}
var remain = chunkSize;
while (remain > 0)
{
var read = BinaryReader.Read(_buffer, 0, Math.Min(BUFFER_LENGTH, remain));
if (read <= 0)
{
throw new EndOfStreamException($"Premature end of stream {remain}, {chunkSize}, {read})");
}
if (written == 0)
{
var directoryName = Path.GetDirectoryName(path);
Directory.CreateDirectory(directoryName);
tempPath = Path.Combine(directoryName,
"." + Path.GetFileName(path) + "." + Path.GetRandomFileName());
fs = new FileStream(tempPath, FileMode.CreateNew, FileAccess.Write, FileShare.Read);
}
if (PlatformHasChmod && shebangPosition < ShebangLength)
{
for (var i = 0; i < read;)
{
if (_buffer[i++] != ShebangBytes[shebangPosition++])
{
// no shebang
shebangPosition = int.MaxValue;
break;
}
if (shebangPosition == ShebangLength)
{
makeExecutable = true;
break;
}
}
}
fs?.Write(_buffer, 0, read);
written += read;
remain -= read;
}
} while (chunkSize > 0);
bodyReadSuccess = written == fsChange.Length;
if (bodyReadSuccess && makeExecutable)
{
// 0755, rwxr-xr-x
fs.ChangeMode(0b111_101_101);
}
// create empty file
if (bodyReadSuccess && fsChange.Length == 0)
{
var directoryName = Path.GetDirectoryName(path);
Directory.CreateDirectory(directoryName);
using (new FileStream(path, FileMode.Create, FileAccess.Write, FileShare.Read))
{
}
File.SetLastWriteTime(path, fsChange.LastWriteTime);
}
return(bodyReadSuccess);
}
catch (Exception)
{
SkipFsChangeBody();
throw;
}
finally
{
if (fs != null)
{
fs.Dispose();
if (bodyReadSuccess)
{
try
{
File.SetLastWriteTime(tempPath, fsChange.LastWriteTime);
File.Move(tempPath, path, true);
}
catch (Exception)
{
FsHelper.TryDeleteFile(tempPath);
throw;
}
}
else
{
FsHelper.TryDeleteFile(tempPath);
}
}
}
}
