Add log messages.

internal/system/system_linux.go

@@ -26,6 +26,7 @@ const (
 
 func SetResolver(resolver string) (err error) {
 	defer errs.Wrap(&err, "failed to set DNS resolver")
+	log.Printf("Setting DNS resolver to %s.", resolver)
 
 	// A Nitro Enclave's /etc/resolv.conf is a symlink to
 	// /run/resolvconf/resolv.conf.  As of 2022-11-21, the /run/ directory
@@ -41,6 +42,7 @@ func SetResolver(resolver string) (err error) {
 
 func SeedRandomness() (err error) {
 	defer errs.Wrap(&err, "failed to seed entropy pool")
+	log.Println("Seeding system entropy pool.")
 
 	s, err := nsm.OpenDefaultSession()
 	if err != nil {
@@ -91,6 +93,7 @@ func SeedRandomness() (err error) {
 // SetupLo sets up the loopback interface.
 func SetupLo() (err error) {
 	defer errs.Wrap(&err, "failed to configure loopback interface")
+	log.Println("Setting up loopback interface.")
 
 	link, err := tenus.NewLinkFrom("lo")
 	if err != nil {
@@ -110,6 +113,7 @@ func SetupLo() (err error) {
 // RNG. This was suggested in:
 // https://blog.trailofbits.com/2024/09/24/notes-on-aws-nitro-enclaves-attack-surface/
 func HasSecureRNG() bool {
+	log.Println("Checking if system uses desired RNG.")
 	haveRNG, err := os.ReadFile(pathToRNG)
 	if err != nil {
 		log.Printf("Error reading %s: %v", pathToRNG, err)
@@ -123,6 +127,7 @@ func HasSecureRNG() bool {
 // includes important security updates. This was suggested in:
 // https://blog.trailofbits.com/2024/09/24/notes-on-aws-nitro-enclaves-attack-surface/
 func HasSecureKernelVersion() bool {
+	log.Println("Checking if system has desired kernel version.")
 	var uname syscall.Utsname
 	if err := syscall.Uname(&uname); err != nil {
 		log.Printf("Error calling uname system call: %v", err)