Start writing out a template for services.

main.go

@@ -4,8 +4,10 @@ import (
 	"fmt"
 	"os"
 	"os/exec"
+	"text/template"
 
 	"github.com/hjson/hjson-go/v4"
+	"dario.cat/mergo"
 )
 
 type Config struct {
@@ -24,6 +26,7 @@ type NetworkingConfig struct {
 type ServiceConfig struct {
 	Enable		string
 	Provider	string
+	Packages	[]string
 	Src		string
 	Ports		[]string
 	Volumes		[]string
@@ -47,8 +50,39 @@ func main() {
 
 	// Parse services
 	for name, service := range config.Services {
+		var s ServiceConfig
 		fmt.Printf("Service: %s\n", name)
-		fmt.Printf(" %v\n", service)
+
+		// Read service config file
+		c, err := os.ReadFile("services/" + name + ".json")
+		if err != nil {
+			fmt.Println("Unknown service: ", err)
+			return
+		}
+
+		// Read service template file
+		t, err := os.ReadFile("services/" + name + ".template")
+		if err != nil {
+			fmt.Println("No template for service: ", err)
+			return
+		}
+
+		// Parse service config
+		err = hjson.Unmarshal(c, &s)
+		if err != nil {
+			fmt.Println(err)
+			return
+		}
+		mergo.Merge(&s, service, mergo.WithOverride)
+		config.Services[name] = s
+		fmt.Printf(" %v\n", s)
+
+		tmpl, err := template.New(name).Parse(string(t))
+		if err != nil {
+			fmt.Println(err)
+			return
+		}
+		err = tmpl.Execute(os.Stdout, s)
 	}
 
 	// Parse package list

services/ssh.json

@@ -0,0 +1,6 @@
+{
+enable:		"true",
+provider:	"system",
+packages:	[ "openssh-server" ],
+ports:		[ "22" ],
+}

services/ssh.template

@@ -0,0 +1,98 @@
+{{if .Ports -}}
+Port {{index .Ports 0}}
+{{- end}}
+#AddressFamily any
+#ListenAddress 0.0.0.0
+#ListenAddress ::
+
+#HostKey /etc/ssh/ssh_host_rsa_key
+#HostKey /etc/ssh/ssh_host_ecdsa_key
+#HostKey /etc/ssh/ssh_host_ed25519_key
+
+# Ciphers and keying
+#RekeyLimit default none
+
+# Logging
+#SyslogFacility AUTH
+#LogLevel INFO
+
+# Authentication:
+
+#LoginGraceTime 2m
+#PermitRootLogin prohibit-password
+#StrictModes yes
+#MaxAuthTries 6
+#MaxSessions 10
+
+#PubkeyAuthentication yes
+
+# The default is to check both .ssh/authorized_keys and .ssh/authorized_keys2
+# but this is overridden so installations will only check .ssh/authorized_keys
+AuthorizedKeysFile	.ssh/authorized_keys
+
+#AuthorizedPrincipalsFile none
+
+#AuthorizedKeysCommand none
+#AuthorizedKeysCommandUser nobody
+
+# For this to work you will also need host keys in /etc/ssh/ssh_known_hosts
+#HostbasedAuthentication no
+# Change to yes if you don't trust ~/.ssh/known_hosts for
+# HostbasedAuthentication
+#IgnoreUserKnownHosts no
+# Don't read the user's ~/.rhosts and ~/.shosts files
+#IgnoreRhosts yes
+
+# To disable tunneled clear text passwords, change to no here!
+#PasswordAuthentication yes
+#PermitEmptyPasswords no
+
+# Change to no to disable s/key passwords
+#KbdInteractiveAuthentication yes
+
+# Kerberos options
+#KerberosAuthentication no
+#KerberosOrLocalPasswd yes
+#KerberosTicketCleanup yes
+#KerberosGetAFSToken no
+
+# GSSAPI options
+#GSSAPIAuthentication no
+#GSSAPICleanupCredentials yes
+
+#UsePAM no
+
+#AllowAgentForwarding yes
+# Feel free to re-enable these if your use case requires them.
+AllowTcpForwarding no
+GatewayPorts no
+X11Forwarding no
+#X11DisplayOffset 10
+#X11UseLocalhost yes
+#PermitTTY yes
+#PrintMotd yes
+#PrintLastLog yes
+#TCPKeepAlive yes
+#PermitUserEnvironment no
+#Compression delayed
+#ClientAliveInterval 0
+#ClientAliveCountMax 3
+#UseDNS no
+#PidFile /run/sshd.pid
+#MaxStartups 10:30:100
+#PermitTunnel no
+#ChrootDirectory none
+#VersionAddendum none
+
+# no default banner path
+#Banner none
+
+# override default of no subsystems
+Subsystem	sftp	internal-sftp
+
+# Example of overriding settings on a per-user basis
+#Match User anoncvs
+#	X11Forwarding no
+#	AllowTcpForwarding no
+#	PermitTTY no
+#	ForceCommand cvs server