initial commit

pkg/config/config.go

@@ -0,0 +1,84 @@
+package config
+
+import (
+	"errors"
+	"io"
+	"os"
+	"strings"
+
+	"gopkg.in/yaml.v3"
+)
+
+// Config captures node-agent runtime configuration.
+type Config struct {
+	ListenAddr   string        `json:"listen_addr" yaml:"listen_addr"`
+	LibvirtURI   string        `json:"libvirt_uri" yaml:"libvirt_uri"`
+	LXCPath      string        `json:"lxc_path" yaml:"lxc_path"`
+	PodmanSocket string        `json:"podman_socket" yaml:"podman_socket"`
+	VMPath       string        `json:"vm_path" yaml:"vm_path"`
+	CTPath       string        `json:"ct_path" yaml:"ct_path"`
+	AuthToken    string        `json:"auth_token" yaml:"auth_token"`
+	StoragePools []StoragePool `json:"storage_pools" yaml:"storage_pools"`
+	Bridges      []Bridge      `json:"bridges" yaml:"bridges"`
+}
+
+type StoragePool struct {
+	Name string `json:"name" yaml:"name"`
+	Type string `json:"type" yaml:"type"`
+	Path string `json:"path" yaml:"path"`
+}
+
+type Bridge struct {
+	Name      string `json:"name" yaml:"name"`
+	VlanAware bool   `json:"vlan_aware" yaml:"vlan_aware"`
+	MTU       int    `json:"mtu" yaml:"mtu"`
+}
+
+// LoadOrExit loads YAML/JSON config and applies defaults. It panics on fatal errors
+// to keep the agent simple for now.
+func LoadOrExit(path string) Config {
+	cfg := Config{
+		ListenAddr: ":8000",
+		LibvirtURI: "qemu:///system",
+		LXCPath:    "/etc/jagacloud/lxc",
+		VMPath:     "/etc/jagacloud/vm",
+		CTPath:     "/etc/jagacloud/ct",
+	}
+
+	f, err := os.Open(path)
+	if err != nil {
+		if errors.Is(err, os.ErrNotExist) {
+			// File missing is allowed; defaults stay in place.
+			return cfg
+		}
+		panic(err)
+	}
+	defer f.Close()
+
+	raw, err := io.ReadAll(f)
+	if err != nil {
+		panic(err)
+	}
+	if err := yaml.Unmarshal(raw, &cfg); err != nil {
+		panic(err)
+	}
+
+	cfg.ListenAddr = strings.TrimSpace(cfg.ListenAddr)
+	if cfg.ListenAddr == "" {
+		cfg.ListenAddr = ":8000"
+	}
+	if cfg.LibvirtURI == "" {
+		cfg.LibvirtURI = "qemu:///system"
+	}
+	if cfg.LXCPath == "" {
+		cfg.LXCPath = "/etc/jagacloud/lxc"
+	}
+	if cfg.VMPath == "" {
+		cfg.VMPath = "/etc/jagacloud/vm"
+	}
+	if cfg.CTPath == "" {
+		cfg.CTPath = "/etc/jagacloud/ct"
+	}
+
+	return cfg
+}