check and return error from parsing var-files (#10569)

* check and return error from parsing var-files

* changelog entry for 1.1.0 and 1.0.5

jobspec2/parse.go

@@ -88,6 +88,10 @@ func decode(c *jobConfig) error {
 
 	for _, varFile := range config.VarFiles {
 		parsedVarFile, ds := parseFile(varFile)
+		if parsedVarFile == nil || ds.HasErrors() {
+			return fmt.Errorf("unable to parse var file: %v", ds.Error())
+		}
+
 		config.parsedVarFiles = append(config.parsedVarFiles, parsedVarFile)
 		diags = append(diags, ds...)
 	}

jobspec2/parse_test.go

@@ -146,7 +146,7 @@ job "example" {
 		defer os.Remove(varFile.Name())
 
 		content := `dc_var = "set_dc"
-region_var = "set_region"`
+	region_var = "set_region"`
 		_, err = varFile.WriteString(content)
 		require.NoError(t, err)
 
@@ -162,6 +162,18 @@ region_var = "set_region"`
 		require.NotNil(t, out.Region)
 		require.Equal(t, "set_region", *out.Region)
 	})
+
+	t.Run("var-file does not exist", func(t *testing.T) {
+
+		out, err := ParseWithConfig(&ParseConfig{
+			Path:     "input.hcl",
+			Body:     []byte(hcl),
+			VarFiles: []string{"does-not-exist.hcl"},
+			AllowFS:  true,
+		})
+		require.Error(t, err)
+		require.Nil(t, out)
+	})
 }
 
 // TestParse_UnknownVariables asserts that unknown variables are left intact for further processing