Generate a dynamic SSH config file to ssh Multipass using fish shell.

gen-ssh-config-for-multipass.fish

function gen-ssh-config-for-multipass --description "Generate a SSH config for multipass."
    echo 'Include ~/.ssh/config

Host mp-*
    User multipass
'
    set -l vms (multipass ls --format csv | grep Running)
    for vm in $vms
        set name (echo $vm | awk -F , '{ print $1 }')
        set ip (echo $vm | awk -F , '{ print $3 }')
        echo "Host mp-$name
    Hostname $ip
"
    end
end

ssh.fish

function ssh
    command ssh -F (gen-ssh-config-for-multipass | psub) $argv
end

usage.fish

> multipass ls
Name                    State             IPv4             Image
primary                 Stopped           --               Ubuntu 18.04 LTS
vm-1                    Running           192.168.64.1     Ubuntu 18.04 LTS
vm-2                    Running           192.168.64.2     Ubuntu 18.04 LTS
vm-3                    Running           192.168.64.3     Ubuntu 18.04 LTS

> gen-ssh-config-for-multipass
Host mp-*
        User multipass

Host mp-vm-1
    Hostname 192.168.64.1

Host mp-vm-2
    Hostname 192.168.64.2

Host mp-vm-3
    Hostname 192.168.64.3

> ssh -F (gen-ssh-config-for-multipass | psub) mp-vm-1
Welcome to Ubuntu 18.04.3 LTS (GNU/Linux 4.15.0-65-generic x86_64)

 * Documentation:  https://help.ubuntu.com
 * Management:     https://landscape.canonical.com
 * Support:        https://ubuntu.com/advantage

  System information as of Wed Oct 30 03:55:59 JST 2019

  System load:  0.72              Processes:              119
  Usage of /:   56.0% of 4.67GB   Users logged in:        0
  Memory usage: 30%               IP address for enp0s2:  192.168.64.1
  Swap usage:   0%                IP address for docker0: 172.17.0.1

 * Kata Containers are now fully integrated in Charmed Kubernetes 1.16!
   Yes, charms take the Krazy out of K8s Kata Kluster Konstruction.

     https://ubuntu.com/kubernetes/docs/release-notes

0 packages can be updated.
0 updates are security updates.


Welcome to fish, the friendly interactive shell
multipass@vm-1 ~>

Please package this script as a fisher one.