Daemon that listens for files to be inserted into the VFS
vfsd listens to port 9908 for TCP connections which obey the following protocol:
GET [sha1] [size]\n
after which the server responds with:
OK [sha1] [size]\n
followed by the entire file, or:
NO [error]\n
followed by disconnecting.
The other command is:
PUT [sha1] [size]\n
after which the server reads the specified number of bytes from the wire and calculates the sha1 and size. Upon success it inserts the file into place and returns:
OK [sha1] [size]\n.
If there is any error it returns:
NO [error]\n
Either way it closes the connection.