Add command to find a free port

cmd/hoster_cli/commands/freePort.go

@@ -0,0 +1,40 @@
+package commands
+
+import (
+	"fmt"
+	"slices"
+
+	"gitea.codeblob.work/pk/hoster/internals/conf"
+	"gitea.codeblob.work/pk/hoster/internals/helpers"
+	"github.com/urfave/cli/v2"
+)
+
+func CmdCheckPort(c *cli.Context) error {
+	sitesAvail := conf.App.MustString("nginx.sitesAvailable")
+	existingProjects, err := helpers.FindHostConfigs(sitesAvail)
+	if err != nil {
+		return err
+	}
+
+	usedPorts := []int{}
+	for _, project := range existingProjects {
+		usedPorts = append(usedPorts, project.InternalPort)
+	}
+
+	port := conf.App.Int("nginx.portRangeStart")
+	freePort := 0
+	for port <= conf.App.Int("nginx.portRangeEnd") {
+		if !slices.Contains(usedPorts, port) && helpers.IsFreePort(port) {
+			freePort = port
+			break
+		}
+		port++
+	}
+
+	if freePort == 0 {
+		return fmt.Errorf("no free port available")
+	}
+
+	fmt.Printf("Free port: %d\n", freePort)
+	return nil
+}