Add windowskext integration, update related packages

updates/fetch.go

@@ -9,6 +9,7 @@ import (
 	"os"
 	"path"
 	"path/filepath"
+	"runtime"
 	"time"
 
 	"github.com/google/renameio"
@@ -70,9 +71,11 @@ func fetchFile(realFilepath, updateFilepath string, tries int) error {
 		return fmt.Errorf("updates: failed to finalize file %s: %s", realFilepath, err)
 	}
 	// set permissions
-	err = os.Chmod(realFilepath, 0644)
-	if err != nil {
-		log.Warningf("updates: failed to set permissions on downloaded file %s: %s", realFilepath, err)
+	if runtime.GOOS != "windows" {
+		err = os.Chmod(realFilepath, 0644)
+		if err != nil {
+			log.Warningf("updates: failed to set permissions on downloaded file %s: %s", realFilepath, err)
+		}
 	}
 
 	log.Infof("updates: fetched %s (stored to %s)", downloadURL, realFilepath)

updates/get.go

@@ -56,7 +56,7 @@ func loadOrFetchFile(identifier string) (*File, error) {
 	}
 
 	// build final filepath
-	realFilePath := filepath.Join(updateStoragePath, versionedFilePath)
+	realFilePath := filepath.Join(updateStoragePath, filepath.FromSlash(versionedFilePath))
 	if _, err := os.Stat(realFilePath); err == nil {
 		// file exists
 		updateUsedStatus(identifier, version)

updates/latest.go

@@ -92,6 +92,7 @@ func ScanForLatest(baseDir string, hardFail bool) (latest map[string]string, las
 		storedVersion, ok := latest[identifierPath]
 		if ok {
 			// FIXME: this will fail on multi-digit version segments!
+			// FIXME: use https://github.com/hashicorp/go-version
 			if version > storedVersion {
 				latest[identifierPath] = version
 			}