fix: panic when using relative paths with context=root (#732)

generate/generate.go

@@ -380,7 +380,10 @@ func doRootGeneration(cfg *config.Tree) Report {
 				continue
 			}
 
-			targetDir := project.NewPath(path.Dir(block.Label))
+			// TODO(i4k): generate report must be redesigned for context=root
+			// Here we use path.Clean("/"+path.Dir(label)) to ensure the
+			// report.Dir is always absolute.
+			targetDir := project.NewPath(path.Clean("/" + path.Dir(block.Label)))
 			err = validateRootGenerateBlock(cfg, block)
 			if err != nil {
 				report.addFailure(targetDir, err)

generate/generate_root_file_test.go

@@ -323,6 +323,29 @@ func TestGenerateRootContext(t *testing.T) {
 				},
 			},
 		},
+		{
+			name: "generate.context=root must have absolute path in label",
+			configs: []hclconfig{
+				{
+					path: "/",
+					add: GenerateFile(
+						Labels("file.txt"),
+						Str("content", "test"),
+						Expr("context", "root"),
+					),
+				},
+			},
+			wantReport: generate.Report{
+				Failures: []generate.FailureResult{
+					{
+						Result: generate.Result{
+							Dir: "/",
+						},
+						Error: errors.E(generate.ErrInvalidGenBlockLabel),
+					},
+				},
+			},
+		},
 		{
 			name: "generate.context=root inside stack generating elsewhere",
 			layout: []string{