feat: accept arguments through ssh command arguments

Configured default arguments are replaced with provided arguments
through the `ssh` command. Without any arguments the default arguments
are used instead.

internal/serve/serve.go

@@ -55,6 +55,10 @@ func setupSshServer(host string, port string, host_key_path string, users map[st
 		wish.WithMiddleware(
 			func(next ssh.Handler) ssh.Handler {
 				return func(s ssh.Session) {
+					provided_args := s.Command()
+					if len(provided_args) > 0 {
+						args = provided_args
+					}
 					cmd := wish.Command(s, name, args...)
 					if err := cmd.Run(); err != nil {
 						wish.Fatalln(s, err)

main.go

@@ -2,7 +2,6 @@ package main
 
 import (
 	"fmt"
-	"os"
 
 	"github.com/spf13/viper"
 	"yves-biener.de/wish-serve/internal/serve"
@@ -15,12 +14,19 @@ func createDefaultConfig() {
 	viper.SetDefault("key.dir", ".ssh")
 	viper.SetDefault("key.name", "ssh_ed25519_key")
 	viper.SetDefault("app.name", "echo")
-	viper.SetDefault("app.args", []string{"Hello World"})
+	viper.SetDefault("app.args", []string{"Hello", "World"})
 }
 
-// Load the configuration file from (`$HOME/.config/serve/config.yml` or
-// `./config.yml`) if it exists. Otherwise use the default values from
-// `createDefaultConfig()`.
+// Load the configuration file from any of the following locations (loading the
+// first one with an existing configuration):
+//   - `$HOME/.config/serve/config.yml`
+//   - `./config.yml`
+//
+// If no configuration is found in any of the defined locations the default
+// values of `createDefaultConfig` will remain unchanged.
+//
+// Invalid configuration files will cause a fatal error causing the application
+// to panic.
 func loadConfig() {
 	viper.SetConfigName("config")
 	viper.SetConfigType("yml")
@@ -33,29 +39,9 @@ func loadConfig() {
 	}
 }
 
-// Overwrite (default) configuration value for the application to serve with
-// given command line arguments.
-//
-// NOTE: This will also overwrite the configuration for the `app` entry from the
-// configuration file.
-func overwriteServeCommand() {
-	if len(os.Args) >= 2 {
-		name := os.Args[1]
-		viper.Set("app.name", name)
-		if len(os.Args) >= 3 {
-			args := os.Args[2:]
-			viper.Set("app.args", args)
-		} else {
-			// no arguments provided -> clear app arguments
-			viper.Set("app.args", []string{})
-		}
-	}
-}
-
 func main() {
 	createDefaultConfig()
 	loadConfig()
-	overwriteServeCommand()
 
 	serve.Serve(
 		viper.GetString("host"),