Always print permissions with three digits

cmd/config.go

@@ -29,7 +29,7 @@ type Config struct {
 	configFile       string
 	SourceDir        string
 	DestDir          string
-	Umask            octalIntValue
+	Umask            permValue
 	DryRun           bool
 	Verbose          bool
 	SourceVCSCommand string

cmd/perm_value.go

@@ -0,0 +1,24 @@
+package cmd
+
+import (
+	"fmt"
+	"strconv"
+)
+
+// An permValue is an int that is printed in octal. It implements the
+// pflag.Value interface for use as a command line flag.
+type permValue int
+
+func (p *permValue) Set(s string) error {
+	v, err := strconv.ParseInt(s, 0, 64)
+	*p = permValue(v)
+	return err
+}
+
+func (p *permValue) String() string {
+	return fmt.Sprintf("%03o", *p)
+}
+
+func (p *permValue) Type() string {
+	return "int"
+}

cmd/root.go

@@ -13,7 +13,7 @@ import (
 
 var (
 	config = Config{
-		Umask:            octalIntValue(getUmask()),
+		Umask:            permValue(getUmask()),
 		SourceVCSCommand: "git",
 	}
 	version = "dev"