Agent update prior 0.6.2

[mjudeikis]

We use this flow to update the agent:

func() error {
     return syscall.Unlink(u.binaryPath)
},
func() error {
     return os.Rename(b.Name(), u.binaryPath)
},

Os.temp creates tmpfs :

 df -T /tmp/go-build* | awk '{print $2}' | tail -n1
tmpfs

and agent is for sure not on tmpfs:

df -T /usr/local/bin/synpse | awk '{print $2}' | tail -n1                                                                                                                                                                                                                                         
btrfs 

This gives error:

invalid cross-device link

Solution: Move to byte level operation for agent move.

[rusenask]

ah yes, just need to read and write as bytes

[mjudeikis]

:cry: Fix soon will be there.