new command: limactl show-ssh --format=(cmd|args|options|config) INSTANCE

[AkihiroSuda]

limactl show-ssh --format=cmd INSTANCE (default format) : Full ssh command line.

ssh -o IdentityFile="/Users/suda/.lima/_config/user" -o IdentityFile="/Users/suda/.ssh/id_ed25519" -o IdentityFile="/Users/suda/.ssh/id_rsa" -o StrictHostKeyChecking=no -o UserKnownHostsFile=/dev/null -o NoHostAuthenticationForLocalhost=yes -o GSSAPIAuthentication=no -o PreferredAuthentications=publickey -o Compression=no -o BatchMode=yes -o IdentitiesOnly=yes -o Ciphers="^aes128-gcm@openssh.com,aes256-gcm@openssh.com" -o User=suda -o ControlMaster=auto -o ControlPath="/Users/suda/.lima/default/ssh.sock" -o ControlPersist=5m -o Hostname=127.0.0.1 -o Port=60022 lima-default

limactl show-ssh --format=args INSTANCE: Similar to the cmd format but omits "ssh" and the destination address

-o IdentityFile="/Users/suda/.lima/_config/user" -o IdentityFile="/Users/suda/.ssh/id_ed25519" -o IdentityFile="/Users/suda/.ssh/id_rsa" -o StrictHostKeyChecking=no -o UserKnownHostsFile=/dev/null -o NoHostAuthenticationForLocalhost=yes -o GSSAPIAuthentication=no -o PreferredAuthentications=publickey -o Compression=no -o BatchMode=yes -o IdentitiesOnly=yes -o Ciphers="^aes128-gcm@openssh.com,aes256-gcm@openssh.com" -o User=suda -o ControlMaster=auto -o ControlPath="/Users/suda/.lima/default/ssh.sock" -o ControlPersist=5m -o Hostname=127.0.0.1 -o Port=60022

limactl show-ssh --format=options INSTANCE: ssh option key value pairs

IdentityFile="/Users/suda/.lima/_config/user"
IdentityFile="/Users/suda/.ssh/id_ed25519"
IdentityFile="/Users/suda/.ssh/id_rsa"
StrictHostKeyChecking=no
UserKnownHostsFile=/dev/null
NoHostAuthenticationForLocalhost=yes
GSSAPIAuthentication=no
PreferredAuthentications=publickey
Compression=no
BatchMode=yes
IdentitiesOnly=yes
Ciphers="^aes128-gcm@openssh.com,aes256-gcm@openssh.com"
User=suda
ControlMaster=auto
ControlPath="/Users/suda/.lima/default/ssh.sock"
ControlPersist=5m
Hostname=127.0.0.1
Port=60022

limactl show-ssh --format=config INSTANCE: ~/.ssh/config format

Host lima-default
  IdentityFile "/Users/suda/.lima/_config/user"
  IdentityFile "/Users/suda/.ssh/id_ed25519"
  IdentityFile "/Users/suda/.ssh/id_rsa"
  StrictHostKeyChecking no
  UserKnownHostsFile /dev/null
  NoHostAuthenticationForLocalhost yes
  GSSAPIAuthentication no
  PreferredAuthentications publickey
  Compression no
  BatchMode yes
  IdentitiesOnly yes
  Ciphers "^aes128-gcm@openssh.com,aes256-gcm@openssh.com"
  User suda
  ControlMaster auto
  ControlPath "/Users/suda/.lima/default/ssh.sock"
  ControlPersist 5m
  Hostname 127.0.0.1
  Port 60022

Usage:

$ limactl show-ssh --format=config default >> ~/.ssh/config
$ ssh lima-default

[jandubois]

Not sure about the general utility of this command, but am not opposed to it. Should probably support an extra --format=url to cover @afbjorklund's "nice to have" from #322 (comment):

Having a similar variable available for the entire SSH URL directly would also be "nice to have".

With a proper ssh:// and the human template's fmt.Sprintf("127.0.0.1:%d", inst.SSHLocalPort)

I could only find a long expired RFC draft specifying the ssh:// URL scheme, and it seems like nobody implements it except for the most basic form ssh://host:port, which is also what Docker seems to support.

[jandubois]

"Usage" message shows "[flags]" in wrong position:

$ limactl show-ssh --help | grep -A1 Usage
Usage:
  limactl show-ssh INSTANCE [flags]

$ limactl show-ssh default -f options
FATA[0000] accepts 1 arg(s), received 3

$ limactl show-ssh -f options default
IdentityFile="/Users/jan/.lima/_config/user"
...

[AkihiroSuda]

url

Not in this PR, but feel free to open an issue/PR

Usage

fixed

[jandubois]

LGTM