fix: respect rootDir for tftp server

pkg/cli/server.go

@@ -25,7 +25,7 @@ func server(cmd *cobra.Command, args []string) {
 		quit(err.Error())
 	}
 
-	tftp := tftp.New()
+	tftp := tftp.New(tftp.WithRootDir(config.GetRootDir()))
 	server, err := ipxe.New(
 		ipxe.WithIP(config.HTTP.IP),
 		ipxe.WithPort(config.HTTP.Port),

pkg/tftp/BUILD.bazel

@@ -2,7 +2,10 @@ load("@rules_go//go:def.bzl", "go_library")
 
 go_library(
     name = "tftp",
-    srcs = ["server.go"],
+    srcs = [
+        "options.go",
+        "server.go",
+    ],
     importpath = "toni.systems/goipxeboot/pkg/tftp",
     visibility = ["//visibility:public"],
     deps = [

pkg/tftp/options.go

@@ -0,0 +1,9 @@
+package tftp
+
+type Option func(*server)
+
+func WithRootDir(dir string) Option {
+	return func(s *server) {
+		s.root = dir
+	}
+}

pkg/tftp/server.go

@@ -4,6 +4,7 @@ import (
 	"errors"
 	"io"
 	"os"
+	"path/filepath"
 	"time"
 
 	"github.com/pin/tftp/v3"
@@ -29,9 +30,10 @@ type Server interface {
 type server struct {
 	tftp     *tftp.Server
 	filename string
+	root     string
 }
 
-func New() Server {
+func New(options ...Option) Server {
 	s := &server{
 		filename: "./ipxe/ipxe.efi",
 	}
@@ -40,6 +42,10 @@ func New() Server {
 	t.SetTimeout(timeout)
 	s.tftp = t
 
+	for _, option := range options {
+		option(s)
+	}
+
 	return s
 }
 
@@ -55,7 +61,9 @@ func (s *server) ReadHandler(filename string, rf io.ReaderFrom) error {
 		return ErrInvalidFilename
 	}
 
-	file, err := os.Open(s.filename)
+	path := filepath.Join(s.root, filename)
+
+	file, err := os.Open(path)
 	if err != nil {
 		return errors.Join(err, ErrFailedToOpenFile)
 	}