repochecker: Use SetWriteFileFunc to avoid writing any file on disk

repochecker/main.go

@@ -6,7 +6,7 @@ import (
 	"errors"
 	"flag"
 	"fmt"
-	"io/ioutil"
+	"io"
 	"log"
 	"os"
 	"os/exec"
@@ -194,14 +194,8 @@ func main() {
 		regenImporter = true
 	}
 
-	var err error
-
-	// Create temporary directory for storing FILES/ content
-	fic.FilesDir, err = ioutil.TempDir("", "fic-repochecker.")
-	if err != nil {
-
-	}
-	defer os.RemoveAll(fic.FilesDir)
+	// Don't write any files
+	sync.SetWriteFileFunc(func(dest string) (io.WriteCloser, error) { return &nullFileWriter{}, nil })
 
 	if sync.GlobalImporter != nil {
 		log.Println("Using", sync.GlobalImporter.Kind())

repochecker/null.go

@@ -0,0 +1,11 @@
+package main
+
+type nullFileWriter struct{}
+
+func (fw *nullFileWriter) Write(p []byte) (int, error) {
+	return len(p), nil
+}
+
+func (fw *nullFileWriter) Close() error {
+	return nil
+}