@@ -1,7 +1,9 @@
 package main
 
 import (
+	"io"
 	"os"
+	"strings"
 
 	"github.com/Southclaws/fault"
 	"github.com/Southclaws/fault/fmsg"
@@ -9,16 +11,53 @@
 	"alin.ovh/searchix/frontend"
 	"alin.ovh/searchix/internal/components"
 	"alin.ovh/searchix/internal/config"
+	"alin.ovh/searchix/internal/file"
 )
 
-type GenerateErrorPageOptions struct{}
+const perm = 0o644
 
-func (*GenerateErrorPageOptions) Execute(_ []string) error {
+type GenerateErrorPageOptions struct {
+	Outdir string `long:"outdir" description:"output directory"`
+}
+
+func (opts *GenerateErrorPageOptions) Execute(_ []string) error {
 	assets, err := frontend.New()
 	if err != nil {
 		return fault.Wrap(err, fmsg.With("could not create frontend"))
 	}
 
+	root, err := file.CreateAndOpenRoot(opts.Outdir)
+	if err != nil {
+		return fault.Wrap(err, fmsg.With("could not open root directory"))
+	}
+	defer root.Close()
+
+	err = writeErrorPageTemplate(root, assets)
+	if err != nil {
+		return err
+	}
+
+	err = root.Mkdir("assets", 0o755)
+	if err != nil {
+		return fault.Wrap(err, fmsg.With("could not create assets directory"))
+	}
+
+	for _, asset := range assets.ByPath {
+		if err := writeFile(root, asset); err != nil {
+			return err
+		}
+	}
+
+	return nil
+}
+
+func writeErrorPageTemplate(root *file.Root, assets *frontend.AssetCollection) error {
+	out, err := root.OpenFile("error.html", os.O_CREATE|os.O_WRONLY, perm)
+	if err != nil {
+		return fault.Wrap(err, fmsg.With("could not open error.html"))
+	}
+	defer out.Close()
+
 	err = components.ErrorTemplate(components.TemplateData{
 		Source: config.Source{
 			Importer: config.All,
@@ -29,9 +68,42 @@ ExtraHeadHTML: "",
 		Code:          0,
 		Message:       `{{placeholder "http.error.status_code"}} {{placeholder "http.error.status_text"}}`,
 		Assets:        assets,
-	}).Render(os.Stdout)
+	}).Render(out)
 	if err != nil {
-		panic("failed to render error template: " + err.Error())
+		return fault.Wrap(err, fmsg.With("could not render error template"))
+	}
+
+	err = out.Sync()
+	if err != nil {
+		return fault.Wrap(err, fmsg.With("could not sync error.html"))
+	}
+
+	return nil
+}
+
+func writeFile(root *file.Root, asset *frontend.Asset) error {
+	outname := strings.TrimPrefix(asset.ImmutablePath, "/")
+
+	in, err := frontend.Files.Open(asset.Filename)
+	if err != nil {
+		return fault.Wrap(err, fmsg.With("could not open asset file"))
+	}
+	defer in.Close()
+
+	out, err := root.OpenFile(outname, os.O_CREATE|os.O_WRONLY, perm)
+	if err != nil {
+		return fault.Wrap(err, fmsg.With("could not open output file"))
+	}
+	defer out.Close()
+
+	_, err = io.Copy(out, in)
+	if err != nil {
+		return fault.Wrap(err, fmsg.With("could not write asset file"))
+	}
+
+	err = out.Sync()
+	if err != nil {
+		return fault.Wrap(err, fmsg.With("could not sync asset file"))
 	}
 
 	return nil

@@ -46,10 +46,7 @@ "alin.ovh/searchix/internal/config.Version=${version}"
   ];
 
   postInstall = ''
-    install -d -m755 $out/lib/searchix/static
-    cp -r $src/frontend/static $out/lib/searchix
-    cp ${css} $out/lib/searchix/static/base.css
-    $out/bin/searchix-web generate-error-page > $out/lib/searchix/error.html
+    $out/bin/searchix-web generate-error-page --outdir $out/lib/searchix/
   '';
 
   modules = ../gomod2nix.toml;