Chmod and Chown may not be supported

proc_master.go

@@ -233,11 +233,11 @@ func (mp *master) fetch() {
 		return
 	}
 	//copy permissions
-	if err := tmpBin.Chmod(mp.binPerms); err != nil {
+	if err := chmod(tmpBin, mp.binPerms); err != nil {
 		mp.warnf("failed to make temp binary executable: %s", err)
 		return
 	}
-	if err := tmpBin.Chown(uid, gid); err != nil {
+	if err := chown(tmpBin, uid, gid); err != nil {
 		mp.warnf("failed to change owner of binary: %s", err)
 		return
 	}

sys_posix.go

@@ -7,6 +7,7 @@ package overseer
 //in some other way on other OSs... TODO!
 
 import (
+	"os"
 	"os/exec"
 	"syscall"
 )
@@ -21,8 +22,18 @@ var (
 )
 
 func move(dst, src string) error {
+	if err := os.Rename(src, dst); err == nil {
+		return nil
+	}
 	//HACK: we're shelling out to mv because linux
 	//throws errors when crossing device boundaryes.
 	//TODO see sys_posix_mv.go
 	return exec.Command("mv", src, dst).Run()
 }
+
+func chmod(f *os.File, perms os.FileMode) error {
+	return f.Chmod(perms)
+}
+func chown(f *os.File, uid, gid int) error {
+	return f.Chown(uid, gid)
+}

sys_unsupported.go

@@ -19,3 +19,11 @@ var (
 func move(dst, src string) error {
 	return errors.New("Not supported")
 }
+
+func chmod(f *os.File, perms os.FileMode) error {
+	return errors.New("Not supported")
+}
+
+func chown(f *os.File, uid, gid int) error {
+	return errors.New("Not supported")
+}

sys_windows.go

@@ -3,8 +3,11 @@
 package overseer
 
 import (
+	"bytes"
 	"fmt"
+	"os"
 	"os/exec"
+	"path/filepath"
 	"syscall"
 )
 
@@ -18,12 +21,26 @@ var (
 )
 
 func move(dst, src string) error {
+	os.MkdirAll(filepath.Dir(dst), 0755)
+	if err := os.Rename(src, dst); err == nil {
+		return nil
+	}
 	//HACK: we're shelling out to move because windows
 	//throws errors when crossing device boundaryes.
 	// https://www.microsoft.com/resources/documentation/windows/xp/all/proddocs/en-us/move.mspx?mfr=true
 	cmd := exec.Command("cmd", "/c", `move /y "`+src+`" "`+dst+`"`)
 	if b, err := cmd.CombinedOutput(); err != nil {
-		return fmt.Errorf("%q: %v: %v", cmd.Args, b, err)
+		return fmt.Errorf("%v: %q: %v", cmd.Args, bytes.TrimSpace(b), err)
 	}
 	return nil
 }
+
+func chmod(f *os.File, perms os.FileMode) error {
+	_ = f.Chmod(perms)
+	return nil
+}
+
+func chown(f *os.File, uid, gid int) error {
+	_ = f.Chown(uid, gid)
+	return nil
+}