generate the ssh key if it does not exist yet

cmd/up.go

@@ -23,6 +23,7 @@ import (
 	_ "embed"
 
 	"github.com/caddyserver/certmagic"
+	"github.com/charmbracelet/keygen"
 	"github.com/charmbracelet/ssh"
 	"github.com/creack/pty"
 	"github.com/mhale/smtpd"
@@ -280,6 +281,12 @@ func NewCmdUp() *cobra.Command {
 				}
 
 				hostKeyPath := utils.ExpandTilde(flags.sshHostKey)
+				if !utils.FileExists(hostKeyPath) {
+					_, err := keygen.New(flags.sshHostKey)
+					if err != nil {
+						return fmt.Errorf("failed to generate host key: %v", err)
+					}
+				}
 
 				server.SetOption(ssh.HostKeyFile(hostKeyPath))
 

go.mod

@@ -83,6 +83,7 @@ require (
 	github.com/caddyserver/zerossl v0.1.3 // indirect
 	github.com/carapace-sh/carapace-shlex v1.0.1 // indirect
 	github.com/cenkalti/backoff/v4 v4.3.0 // indirect
+	github.com/charmbracelet/keygen v0.5.1 // indirect
 	github.com/charmbracelet/lipgloss v0.13.0 // indirect
 	github.com/charmbracelet/x/ansi v0.2.3 // indirect
 	github.com/charmbracelet/x/conpty v0.1.0 // indirect

go.sum

@@ -118,6 +118,8 @@ github.com/cenkalti/backoff/v4 v4.3.0/go.mod h1:Y3VNntkOUPxTVeUxJ/G5vcM//AlwfmyY
 github.com/census-instrumentation/opencensus-proto v0.2.1/go.mod h1:f6KPmirojxKA12rnyqOA5BBL4O983OfeGPqjHWSTneU=
 github.com/charmbracelet/glamour v0.8.0 h1:tPrjL3aRcQbn++7t18wOpgLyl8wrOHUEDS7IZ68QtZs=
 github.com/charmbracelet/glamour v0.8.0/go.mod h1:ViRgmKkf3u5S7uakt2czJ272WSg2ZenlYEZXT2x7Bjw=
+github.com/charmbracelet/keygen v0.5.1 h1:zBkkYPtmKDVTw+cwUyY6ZwGDhRxXkEp0Oxs9sqMLqxI=
+github.com/charmbracelet/keygen v0.5.1/go.mod h1:zznJVmK/GWB6dAtjluqn2qsttiCBhA5MZSiwb80fcHw=
 github.com/charmbracelet/lipgloss v0.13.0 h1:4X3PPeoWEDCMvzDvGmTajSyYPcZM4+y8sCA/SsA3cjw=
 github.com/charmbracelet/lipgloss v0.13.0/go.mod h1:nw4zy0SBX/F/eAO1cWdcvy6qnkDUxr8Lw7dvFrAIbbY=
 github.com/charmbracelet/ssh v0.0.0-20241211182756-4fe22b0f1b7c h1:treQxMBdI2PaD4eOYfFux8stfCkUxhuUxaqGcxKqVpI=