chore: close gzip readers (#2134)

Author: emosbaugh

pkg/airgap/materialize.go

@@ -24,6 +24,7 @@ func MaterializeAirgap(airgapReader io.Reader) error {
 	if err != nil {
 		return fmt.Errorf("failed to decompress airgap file: %w", err)
 	}
+	defer ungzip.Close()
 
 	// iterate through tarball
 	tarreader := tar.NewReader(ungzip)
@@ -117,6 +118,7 @@ func writeChartFiles(reader io.Reader) error {
 	if err != nil {
 		return fmt.Errorf("failed to decompress airgap file: %w", err)
 	}
+	defer ungzip.Close()
 
 	// iterate through tarball
 	tarreader := tar.NewReader(ungzip)

pkg/airgap/version.go

@@ -5,9 +5,9 @@ import (
 	"compress/gzip"
 	"fmt"
 	"io"
-	"sigs.k8s.io/yaml"
 
 	kotsv1beta1 "github.com/replicatedhq/kotskinds/apis/kots/v1beta1"
+	"sigs.k8s.io/yaml"
 )
 
 // ChannelReleaseMetadata returns the appSlug, channelID, and versionLabel of the airgap bundle
@@ -19,6 +19,7 @@ func ChannelReleaseMetadata(reader io.Reader) (appSlug, channelID, versionLabel
 		err = fmt.Errorf("failed to decompress airgap file: %w", err)
 		return
 	}
+	defer ungzip.Close()
 
 	// iterate through tarball
 	tarreader := tar.NewReader(ungzip)

pkg/tgzutils/tgz.go

@@ -21,6 +21,7 @@ func Decompress(tgz, dst string) error {
 	if err != nil {
 		return fmt.Errorf("unable to create gzip reader: %v", err)
 	}
+	defer gzreader.Close()
 
 	tarreader := tar.NewReader(gzreader)
 	for {