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backend/internal/misc/copy-example-config.go

@@ -0,0 +1,40 @@
+package misc
+
+import (
+	"io"
+	"os"
+	"path/filepath"
+
+	log "github.com/sirupsen/logrus"
+)
+
+func CopyConfigTemplate(src, dst string) error {
+	in, err := os.Open(src)
+	if err != nil {
+		return err
+	}
+	defer func() {
+		if errClose := in.Close(); errClose != nil {
+			log.WithError(errClose).Warn("failed to close source config file")
+		}
+	}()
+
+	if err = os.MkdirAll(filepath.Dir(dst), 0o700); err != nil {
+		return err
+	}
+
+	out, err := os.OpenFile(dst, os.O_CREATE|os.O_WRONLY|os.O_TRUNC, 0o600)
+	if err != nil {
+		return err
+	}
+	defer func() {
+		if errClose := out.Close(); errClose != nil {
+			log.WithError(errClose).Warn("failed to close destination config file")
+		}
+	}()
+
+	if _, err = io.Copy(out, in); err != nil {
+		return err
+	}
+	return out.Sync()
+}