chore: remove deprecated io/ioutil package & fix shadowing/lint issues

helm_wrapper.go

@@ -3,7 +3,6 @@ package main
 import (
 	"crypto/sha256"
 	"fmt"
-	"io/ioutil"
 	"os"
 	"os/exec"
 	"path"
@@ -15,15 +14,15 @@ import (
 )
 
 type HelmWrapper struct {
-	Errors []error
+	Errors   []error
 	errMutex sync.Mutex
 
 	ExitCode int
 
-	helmBinPath string
+	helmBinPath         string
 	pipeWriterWaitGroup sync.WaitGroup
-	valuesArgRegexp *regexp.Regexp
-	temporaryDirectory string
+	valuesArgRegexp     *regexp.Regexp
+	temporaryDirectory  string
 }
 
 func NewHelmWrapper() (*HelmWrapper, error) {
@@ -63,19 +62,19 @@ func (c *HelmWrapper) pipeWriter(outPipeName string, data []byte) {
 
 	cleartextSecretFile, err := os.OpenFile(outPipeName, os.O_WRONLY, 0)
 	if err != nil {
-		c.errorf("failed to open cleartext secret pipe '%s' in pipe writer: %s", outPipeName, err)
+		_ = c.errorf("failed to open cleartext secret pipe '%s' in pipe writer: %s", outPipeName, err)
 		return
 	}
 	defer func() {
-		err := cleartextSecretFile.Close()
+		err = cleartextSecretFile.Close()
 		if err != nil {
-			c.errorf("failed to close cleartext secret pipe '%s' in pipe writer: %s", outPipeName, err)
+			_ = c.errorf("failed to close cleartext secret pipe '%s' in pipe writer: %s", outPipeName, err)
 		}
 	}()
 
 	_, err = cleartextSecretFile.Write(data)
 	if err != nil {
-		c.errorf("failed to write cleartext secret to pipe '%s': %s", outPipeName, err)
+		_ = c.errorf("failed to write cleartext secret to pipe '%s': %s", outPipeName, err)
 	}
 }
 
@@ -114,14 +113,14 @@ func (c *HelmWrapper) replaceValueFileArg(args []string, cleartextSecretFilename
 
 func (c *HelmWrapper) mkTmpDir() (func(), error) {
 	var err error
-	c.temporaryDirectory, err = ioutil.TempDir("", fmt.Sprintf("%s.", path.Base(os.Args[0])))
+	c.temporaryDirectory, err = os.MkdirTemp("", fmt.Sprintf("%s.", path.Base(os.Args[0])))
 	if err != nil {
 		return nil, c.errorf("failed to create temporary directory: %s", err)
 	}
 	return func() {
 		err := os.RemoveAll(c.temporaryDirectory)
 		if err != nil {
-			c.errorf("failed to remove temporary directory '%s': %s", c.temporaryDirectory, err)
+			_ = c.errorf("failed to remove temporary directory '%s': %s", c.temporaryDirectory, err)
 		}
 	}, nil
 }
@@ -134,7 +133,7 @@ func (c *HelmWrapper) mkPipe(cleartextSecretFilename string) (func(), error) {
 	return func() {
 		err := os.Remove(cleartextSecretFilename)
 		if err != nil {
-			c.errorf("failed to remove cleartext secret pipe '%s': %s", cleartextSecretFilename, err)
+			_ = c.errorf("failed to remove cleartext secret pipe '%s': %s", cleartextSecretFilename, err)
 		}
 	}, nil
 }
@@ -154,17 +153,19 @@ func (c *HelmWrapper) RunHelm() {
 	for i := range os.Args {
 		args := os.Args[i:]
 
-		filename, cleartextSecretFilename, err := c.valuesArg(args)
+		var filename, cleartextSecretFilename string
+		filename, cleartextSecretFilename, err = c.valuesArg(args)
 		if err != nil {
 			return
 		}
 		if filename == "" {
 			continue
 		}
 
-		encrypted, err := DetectSopsYaml(filename)
+		var encrypted bool
+		encrypted, err = DetectSopsYaml(filename)
 		if err != nil {
-			c.errorf("error checking if file is encrypted: %s", err)
+			_ = c.errorf("error checking if file is encrypted: %s", err)
 			return
 		}
 		if !encrypted {
@@ -173,13 +174,15 @@ func (c *HelmWrapper) RunHelm() {
 
 		c.replaceValueFileArg(args, cleartextSecretFilename)
 
-		cleartextSecrets, err := decrypt.File(filename, "yaml")
+		var cleartextSecrets []byte
+		cleartextSecrets, err = decrypt.File(filename, "yaml")
 		if err != nil {
-			c.errorf("failed to decrypt secret file '%s': %s", filename, err)
+			_ = c.errorf("failed to decrypt secret file '%s': %s", filename, err)
 			return
 		}
 
-		cleanFn, err := c.mkPipe(cleartextSecretFilename)
+		var cleanFn func()
+		cleanFn, err = c.mkPipe(cleartextSecretFilename)
 		if err != nil {
 			return
 		}
@@ -198,6 +201,6 @@ func (c *HelmWrapper) RunHelm() {
 	err = cmd.Run()
 	if err != nil {
 		c.ExitCode = cmd.ProcessState.ExitCode()
-		c.errorf("failed to run Helm: %s", err)
+		_ = c.errorf("failed to run Helm: %s", err)
 	}
 }

utils.go

@@ -1,20 +1,21 @@
 package main
 
 import (
-	"io/ioutil"
+	"os"
+
 	"gopkg.in/yaml.v3"
 )
 
 func DetectSopsYaml(filename string) (bool, error) {
-	data, err := ioutil.ReadFile(filename)
+	data, err := os.ReadFile(filename)
 	if err != nil {
 		return false, err
 	}
 
 	var sf map[string]interface{}
 	err = yaml.Unmarshal(data, &sf)
 	if err != nil {
-	    return false, err
+		return false, err
 	}
 
 	if _, ok := sf["sops"]; ok {