ZFS Backup Tool Part 5

Written by: Robert R. Russell on Thursday, August 13, 2020.

Now that I can read a list of snapshots, I need to read a snapshot and transfer it to the destination. The three functions that allow me to do that are exec.StdinPipe(), exec.StdoutPipe(), and io.CopyBuffer().

The process consists of the following steps:

Create an exec.Cmd representing the zfs send command
Use exec.StdoutPipe() to connect a pipe to the output of the command created in step 1.
Create an exec.Cmd representing the zfs receive command
Use exec.StdinPipe() to connect a pipe to the input of the command created in step 3.
Start both commands
Use io.CopyBuffer() to read from the snapshot to the receiver.

You can view the code here.