dockerfile: fix parsing syntax directive from JSON

Due to regression, parsing would fail if JSON had other datatypes than strings. Signed-off-by: Tonis Tiigi <[email protected]>
scope-demo · Mar 5, 2025 · 4e8bc5f · 4e8bc5f
1 parent 21a6d8b
commit 4e8bc5f
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Showing 2 changed files with 10 additions and 8 deletions.
diff --git a/frontend/dockerfile/parser/directives.go b/frontend/dockerfile/parser/directives.go
@@ -148,14 +148,16 @@ func parseDirective(key string, dt []byte, anyFormat bool) (string, string, []Ra
 	}
 
 	// use json directive, and search for { "key": "..." }
-	jsonDirective := map[string]string{}
+	jsonDirective := map[string]any{}
 	if err := json.Unmarshal(dt, &jsonDirective); err == nil {
-		if v, ok := jsonDirective[key]; ok {
-			loc := []Range{{
-				Start: Position{Line: line},
-				End:   Position{Line: line},
-			}}
-			return v, v, loc, true
+		if vAny, ok := jsonDirective[key]; ok {
+			if v, ok := vAny.(string); ok {
+				loc := []Range{{
+					Start: Position{Line: line},
+					End:   Position{Line: line},
+				}}
+				return v, v, loc, true
+			}
 		}
 	}
 

diff --git a/frontend/dockerfile/parser/directives_test.go b/frontend/dockerfile/parser/directives_test.go
@@ -89,7 +89,7 @@ RUN ls
 	require.True(t, ok)
 	require.Equal(t, "x", ref)
 
-	dt = `{"syntax": "foo"}`
+	dt = `{"syntax": "foo", "bar": ["abc"]}`
 	ref, _, _, ok = DetectSyntax([]byte(dt))
 	require.True(t, ok)
 	require.Equal(t, "foo", ref)