fix: prevent panic on empty key

stasadev · ndeloof · commit 924bff96ef98 · 2025-07-15T07:49:20.000+02:00
Signed-off-by: Stanislav Zhuk &lt;stasadev@gmail.com&gt;
diff --git a/types/mapping.go b/types/mapping.go
@@ -95,7 +95,7 @@ func (m *MappingWithEquals) DecodeMapstructure(value interface{}) error {
 		mapping := make(MappingWithEquals, len(v))
 		for _, s := range v {
 			k, e, ok := strings.Cut(fmt.Sprint(s), "=")
-			if unicode.IsSpace(rune(k[len(k)-1])) {
+			if k != "" && unicode.IsSpace(rune(k[len(k)-1])) {
 				return fmt.Errorf("environment variable %s is declared with a trailing space", k)
 			}
 			if !ok {

Original file line number	Diff line number	Diff line change
`@@ -95,7 +95,7 @@ func (m *MappingWithEquals) DecodeMapstructure(value interface{}) error {`
`95`	`95`	`mapping := make(MappingWithEquals, len(v))`
`96`	`96`	`for _, s := range v {`
`97`	`97`	`k, e, ok := strings.Cut(fmt.Sprint(s), "=")`
`98`		`- if unicode.IsSpace(rune(k[len(k)-1])) {`
	`98`	`+ if k != "" && unicode.IsSpace(rune(k[len(k)-1])) {`
`99`	`99`	`return fmt.Errorf("environment variable %s is declared with a trailing space", k)`
`100`	`100`	`}`
`101`	`101`	`if !ok {`