glick.txt

Basic setup:
      mount --make-rshared /
      something mounted on /opt/glick (could be a bind to itself, could be a session glick)
      

main glick fs:
     mount initially empty fs at ~/.glick
     make a AF_UNIX SEQPACKET socket at ~/.glick/ (fork to bind the socket)
     loop, looking at the session fd(s) and the socket fd:
     	   serve fuse files
	   accept packets from socket, mounting subdirs, unmounting on socket close


bundle:
   socket = connect to ~/.glick/socket
   fd = open (bundle)
   pass fd to socket, requesting a mount => subdir
   close (fd)

   make tempdir     
   fork:
     child:
       fuse_mount at tempdir
       signal parent
       wait for parent
       unmount tempdir
       handle fuse


     parent:
       close (socket)
       If /opt/glick is not a mount, bind mount to itself
       unshare (newns)
       make private /opt/glick
       bind mount tempdir to /opt/glick
       bind mount ~/.glick/$subdir to /opt/glick
       
       exec child in /opt/glick       
       
    







elf binary w std code + data
std code:
  exec glick2 with existing argv

glick2:
  fork 
     create tempdir for mount
     create pipe1
     create pipe2
     child:
       mount fuse 
       write pipe1_w
       read pipe2_r
       unmount and rmdir tmpdir
       handle ops, reading data from argv[0]
     parent:
       read pipe1_r
       exec private-mount $tempdir "default-bin" -fd $pipe2_w argv