fix: use errors method to check equivalence (#377)

Signed-off-by: Chris Gianelloni <[email protected]>

Author: wolf31o2

pkgmgr/docker.go

@@ -267,7 +267,7 @@ func (d *DockerService) Logs(
 	}
 	defer logsOut.Close()
 	if _, err := stdcopy.StdCopy(stdoutWriter, stderrWriter, logsOut); err != nil {
-		if err != io.EOF {
+		if !errors.Is(err, io.EOF) {
 			return err
 		}
 	}

pkgmgr/package.go

@@ -686,7 +686,7 @@ func (p *PackageInstallStepDocker) preflight(cfg Config, pkgName string) error {
 	}
 	containerName := fmt.Sprintf("%s-%s", pkgName, p.ContainerName)
 	if _, err := NewDockerServiceFromContainerName(containerName, cfg.Logger); err != nil {
-		if err == ErrContainerNotExists {
+		if errors.Is(err, ErrContainerNotExists) {
 			// Container does not exist (we want this)
 			return nil
 		} else {
@@ -795,7 +795,7 @@ func (p *PackageInstallStepDocker) uninstall(
 		containerName := fmt.Sprintf("%s-%s", pkgName, p.ContainerName)
 		svc, err := NewDockerServiceFromContainerName(containerName, cfg.Logger)
 		if err != nil {
-			if err == ErrContainerNotExists {
+			if errors.Is(err, ErrContainerNotExists) {
 				cfg.Logger.Debug(
 					"container missing on uninstall: " + containerName,
 				)

pkgmgr/pkgmgr.go

@@ -86,7 +86,7 @@ func (p *PackageManager) loadPackageRegistry(validate bool) error {
 	var retErr error
 	registryPkgs, err := registryPackages(p.config, validate)
 	if err != nil {
-		if err == ErrValidationFailed {
+		if errors.Is(err, ErrValidationFailed) {
 			// We want to pass along the validation error, but only after we record the packages
 			retErr = err
 		} else {
@@ -682,7 +682,7 @@ func (p *PackageManager) ValidatePackages() error {
 	foundError := false
 	if len(p.availablePackages) == 0 {
 		if err := p.loadPackageRegistry(true); err != nil {
-			if err == ErrValidationFailed {
+			if errors.Is(err, ErrValidationFailed) {
 				// Record error for later failure
 				// The error(s) will have already been output to the console
 				foundError = true