Remove ioutil usage in favor of os

ioutil has been deprecated, let's use os instead.

Author: rhmdnd

helpers/utilities.go

@@ -6,7 +6,6 @@ import (
 	"errors"
 	"fmt"
 	"io"
-	"io/ioutil"
 	"log"
 	"os"
 	"os/exec"
@@ -94,7 +93,7 @@ func assertContentDirectory(tc *testConfig.TestConfig) error {
 }
 
 func cloneContentDir() (string, error) {
-	dir, tmperr := ioutil.TempDir("", "content-*")
+	dir, tmperr := os.MkdirTemp("", "content-*")
 	if tmperr != nil {
 		return "", fmt.Errorf("couldn't create tmpdir: %w", tmperr)
 	}
@@ -860,7 +859,7 @@ func assertResultsAgainstAssertionFile(
 
 // loadAssertionsFromPath loads rule assertions from a specific file path.
 func loadAssertionsFromPath(p string) (*RuleTestResults, error) {
-	data, err := ioutil.ReadFile(p)
+	data, err := os.ReadFile(p)
 	if err != nil {
 		return nil, err
 	}
@@ -976,7 +975,7 @@ func GenerateAssertionFileFromResults(
 	}
 
 	fullPath := path.Join(tc.LogDir, assertionFile)
-	err = ioutil.WriteFile(fullPath, data, 0o600)
+	err = os.WriteFile(fullPath, data, 0o600)
 	if err != nil {
 		return fmt.Errorf("failed to write assertion file: %w", err)
 	}
@@ -1740,7 +1739,7 @@ func SaveResultAsYAML(tc *testConfig.TestConfig, results map[string]string, file
 	if err != nil {
 		return fmt.Errorf("failed to marshal results to YAML: %w", err)
 	}
-	err = ioutil.WriteFile(p, yamlData, 0o600)
+	err = os.WriteFile(p, yamlData, 0o600)
 	if err != nil {
 		return fmt.Errorf("failed to write YAML file: %w", err)
 	}
@@ -1755,7 +1754,7 @@ func SaveMismatchesAsYAML(tc *testConfig.TestConfig, mismatchedAssertions []Asse
 	if err != nil {
 		return fmt.Errorf("failed to marshal results to YAML: %w", err)
 	}
-	err = ioutil.WriteFile(p, yamlData, 0o600)
+	err = os.WriteFile(p, yamlData, 0o600)
 	if err != nil {
 		return fmt.Errorf("failed to write YAML file: %w", err)
 	}
@@ -1813,7 +1812,7 @@ func GenerateMismatchReport(
 	f := fmt.Sprintf("%s-report.md", bindingName)
 	p := path.Join(tc.LogDir, f)
 
-	err := ioutil.WriteFile(p, []byte(report.String()), 0o600)
+	err := os.WriteFile(p, []byte(report.String()), 0o600)
 	if err != nil {
 		return fmt.Errorf("failed to write markdown report: %w", err)
 	}
@@ -1825,7 +1824,7 @@ func GenerateMismatchReport(
 	htmlFilename := fmt.Sprintf("%s-report.html", bindingName)
 	htmlFilePath := path.Join(tc.LogDir, htmlFilename)
 
-	err = ioutil.WriteFile(htmlFilePath, []byte(htmlContent), 0o600)
+	err = os.WriteFile(htmlFilePath, []byte(htmlContent), 0o600)
 	if err != nil {
 		return fmt.Errorf("failed to write HTML report: %w", err)
 	}