Rename the windows exec driver file to be the default exec driver.

No functional difference in practice, but results in a more clean build.

client/driver/exec_default.go

@@ -0,0 +1,12 @@
+// +build !darwin,!dragonfly,!freebsd,!linux,!netbsd,!openbsd,!solaris
+
+package driver
+
+import (
+	"github.com/hashicorp/nomad/client/config"
+	"github.com/hashicorp/nomad/nomad/structs"
+)
+
+func (d *ExecDriver) Fingerprint(cfg *config.Config, node *structs.Node) (bool, error) {
+	return false, nil
+}

client/driver/exec_windows.go

@@ -1,36 +0,0 @@
-// +build windows
-
-package driver
-
-import (
-	"github.com/hashicorp/nomad/client/config"
-	"github.com/hashicorp/nomad/nomad/structs"
-	"golang.org/x/sys/windows"
-)
-
-func (d *ExecDriver) Fingerprint(cfg *config.Config, node *structs.Node) (bool, error) {
-	// Get the current status so that we can log any debug messages only if the
-	// state changes
-	_, currentlyEnabled := node.Attributes[execDriverAttr]
-
-	// Only enable if cgroups are available and we are root
-	if _, ok := node.Attributes["unique.cgroup.mountpoint"]; !ok {
-		if currentlyEnabled {
-			d.logger.Printf("[DEBUG] driver.exec: cgroups unavailable, disabling")
-		}
-		delete(node.Attributes, execDriverAttr)
-		return false, nil
-	} else if windows.Geteuid() != 0 {
-		if currentlyEnabled {
-			d.logger.Printf("[DEBUG] driver.exec: must run as root user, disabling")
-		}
-		delete(node.Attributes, execDriverAttr)
-		return false, nil
-	}
-
-	if !currentlyEnabled {
-		d.logger.Printf("[DEBUG] driver.exec: exec driver is enabled")
-	}
-	node.Attributes[execDriverAttr] = "1"
-	return true, nil
-}