From e10381694b57f756f68f30cfa5158785f231d618 Mon Sep 17 00:00:00 2001
From: Alec Thomas <alec@swapoff.org>
Date: Fri, 10 Jul 2020 13:52:32 +1000
Subject: [PATCH] Allow unsetting of FileContentFlag values.

---
 .gitignore | 1 +
 mapper.go  | 5 +++++
 2 files changed, 6 insertions(+)
 create mode 100644 .gitignore

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..ba077a4
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+bin
diff --git a/mapper.go b/mapper.go
index b0f99b1..9425fc6 100644
--- a/mapper.go
+++ b/mapper.go
@@ -704,6 +704,11 @@ func (f *FileContentFlag) Decode(ctx *DecodeContext) error { // nolint: golint
 	if err != nil {
 		return err
 	}
+	// This allows unsetting of file content flags.
+	if filename == "" {
+		*f = nil
+		return nil
+	}
 	filename = ExpandPath(filename)
 	data, err := ioutil.ReadFile(filename) // nolint: gosec
 	if err != nil {