seedling: Webui enhancements (#620)

* 🌱 Make sure webui starts on alpine

Also drop to shell when there are no providers

Signed-off-by: mudler <mudler@c3os.io>

* 🌱 Suppress verbose logging on tty

Signed-off-by: mudler <mudler@c3os.io>

* 🌱 Print WebUI address

Signed-off-by: mudler <mudler@c3os.io>

* 🎨 Update banner

Signed-off-by: mudler <mudler@c3os.io>

* 🌱 Refactor, display also interfaces

Signed-off-by: mudler <mudler@c3os.io>

* 🌱 Address feedback from review

Signed-off-by: mudler <mudler@c3os.io>

Signed-off-by: mudler <mudler@c3os.io>

pkg/config/config.go

@@ -19,6 +19,8 @@ import (
 	"gopkg.in/yaml.v3"
 )
 
+const DefaultWebUIListenAddress = ":8080"
+
 type Install struct {
 	Auto                   bool              `yaml:"auto,omitempty"`
 	Reboot                 bool              `yaml:"reboot,omitempty"`

pkg/machine/network.go

@@ -0,0 +1,44 @@
+package machine
+
+import (
+	"net"
+)
+
+func Interfaces() (in []string) {
+	ifaces, err := net.Interfaces()
+	if err != nil {
+		return
+	}
+	for _, i := range ifaces {
+		if i.Flags == net.FlagLoopback {
+			continue
+		}
+		in = append(in, i.Name)
+	}
+	return
+}
+
+func LocalIPs() (ips []string) {
+	ifaces, err := net.Interfaces()
+	if err != nil {
+		return
+	}
+	for _, i := range ifaces {
+		if i.Flags == net.FlagLoopback {
+			continue
+		}
+		addrs, err := i.Addrs()
+		if err != nil {
+			continue
+		}
+		for _, a := range addrs {
+			ip, _, err := net.ParseCIDR(a.String())
+			if err != nil {
+				continue
+			}
+
+			ips = append(ips, ip.String())
+		}
+	}
+	return
+}