diff --git a/go.mod b/go.mod
index 4f4e51fa..5a57176d 100644
--- a/go.mod
+++ b/go.mod
@@ -4,6 +4,7 @@ go 1.13
 
 require (
 	github.com/kyokomi/emoji v2.1.0+incompatible
-	github.com/qdm12/golibs v0.0.0-20200206031633-f9e9b1bea1db
+	github.com/qdm12/golibs v0.0.0-20200208143139-ccf3a2b4be96
 	github.com/stretchr/testify v1.4.0
+	golang.org/x/sys v0.0.0-20190412213103-97732733099d
 )
diff --git a/go.sum b/go.sum
index 4ac930c9..3d77f9f2 100644
--- a/go.sum
+++ b/go.sum
@@ -44,8 +44,8 @@ github.com/pkg/errors v0.8.1 h1:iURUrRGxPUNPdy5/HRSm+Yj6okJ6UtLINN0Q9M4+h3I=
 github.com/pkg/errors v0.8.1/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
 github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
 github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
-github.com/qdm12/golibs v0.0.0-20200206031633-f9e9b1bea1db h1:Q3bR2GWwvDxQ0EqLKUupzHswsBsEi3eMWxAPfvzKTbM=
-github.com/qdm12/golibs v0.0.0-20200206031633-f9e9b1bea1db/go.mod h1:YULaFjj6VGmhjak6f35sUWwEleHUmngN5IQ3kdvd6XE=
+github.com/qdm12/golibs v0.0.0-20200208143139-ccf3a2b4be96 h1:TAhod+kjxTQHdqMNnDkg6IbLRrGovtI+3l1Isjd1wbI=
+github.com/qdm12/golibs v0.0.0-20200208143139-ccf3a2b4be96/go.mod h1:YULaFjj6VGmhjak6f35sUWwEleHUmngN5IQ3kdvd6XE=
 github.com/rogpeppe/go-internal v1.3.0/go.mod h1:M8bDsm7K2OlrFYOpmOWEs/qY81heoFRclV5y23lUDJ4=
 github.com/stretchr/objx v0.1.0 h1:4G4v2dO3VZwixGIRoQ5Lfboy6nUhCyYzaqnIAPPhYs4=
 github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
@@ -73,6 +73,7 @@ golang.org/x/net v0.0.0-20190404232315-eb5bcb51f2a3/go.mod h1:t9HGtf8HONx5eT2rtn
 golang.org/x/net v0.0.0-20190620200207-3b0461eec859/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
 golang.org/x/sync v0.0.0-20190423024810-112230192c58/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
 golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
+golang.org/x/sys v0.0.0-20190412213103-97732733099d h1:+R4KGOnez64A81RvjARKc4UT5/tI9ujCIVX+P5KiHuI=
 golang.org/x/sys v0.0.0-20190412213103-97732733099d/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
 golang.org/x/tools v0.0.0-20190311212946-11955173bddd/go.mod h1:LCzVGOaR6xXOjkQ3onu1FJEFr0SW1gC7cKk1uF8kGRs=
diff --git a/internal/dns/conf.go b/internal/dns/conf.go
index 86a77e79..deccc36e 100644
--- a/internal/dns/conf.go
+++ b/internal/dns/conf.go
@@ -24,8 +24,8 @@ func (c *configurator) MakeUnboundConf(settings settings.DNS, uid, gid int) (err
 	return c.fileManager.WriteLinesToFile(
 		string(constants.UnboundConf),
 		lines,
-		files.FileOwnership(uid, gid),
-		files.FilePermissions(0400))
+		files.Ownership(uid, gid),
+		files.Permissions(0400))
 }
 
 // MakeUnboundConf generates an Unbound configuration from the user provided settings
diff --git a/internal/dns/roots.go b/internal/dns/roots.go
index ad15a996..2697b992 100644
--- a/internal/dns/roots.go
+++ b/internal/dns/roots.go
@@ -18,8 +18,8 @@ func (c *configurator) DownloadRootHints(uid, gid int) error {
 	return c.fileManager.WriteToFile(
 		string(constants.RootHints),
 		content,
-		files.FileOwnership(uid, gid),
-		files.FilePermissions(0400))
+		files.Ownership(uid, gid),
+		files.Permissions(0400))
 }
 
 func (c *configurator) DownloadRootKey(uid, gid int) error {
@@ -33,6 +33,6 @@ func (c *configurator) DownloadRootKey(uid, gid int) error {
 	return c.fileManager.WriteToFile(
 		string(constants.RootKey),
 		content,
-		files.FileOwnership(uid, gid),
-		files.FilePermissions(0400))
+		files.Ownership(uid, gid),
+		files.Permissions(0400))
 }
diff --git a/internal/openvpn/auth.go b/internal/openvpn/auth.go
index 0e022f2d..b4a61e21 100644
--- a/internal/openvpn/auth.go
+++ b/internal/openvpn/auth.go
@@ -18,6 +18,6 @@ func (c *configurator) WriteAuthFile(user, password string, uid, gid int) error
 	return c.fileManager.WriteLinesToFile(
 		string(constants.OpenVPNAuthConf),
 		[]string{user, password},
-		files.FileOwnership(uid, gid),
-		files.FilePermissions(0400))
+		files.Ownership(uid, gid),
+		files.Permissions(0400))
 }
diff --git a/internal/pia/conf.go b/internal/pia/conf.go
index 28bc8358..a0ee6f09 100644
--- a/internal/pia/conf.go
+++ b/internal/pia/conf.go
@@ -81,6 +81,6 @@ func (c *configurator) BuildConf(region models.PIARegion, protocol models.Networ
 		"</ca>",
 		"",
 	}...)
-	err = c.fileManager.WriteLinesToFile(string(constants.OpenVPNConf), lines, files.FileOwnership(uid, gid), files.FilePermissions(0400))
+	err = c.fileManager.WriteLinesToFile(string(constants.OpenVPNConf), lines, files.Ownership(uid, gid), files.Permissions(0400))
 	return IPs, port, err
 }
diff --git a/internal/shadowsocks/conf.go b/internal/shadowsocks/conf.go
index f8e3b107..d59a6f48 100644
--- a/internal/shadowsocks/conf.go
+++ b/internal/shadowsocks/conf.go
@@ -14,8 +14,8 @@ func (c *configurator) MakeConf(port uint16, password string, uid, gid int) (err
 	return c.fileManager.WriteToFile(
 		string(constants.ShadowsocksConf),
 		data,
-		files.FileOwnership(uid, gid),
-		files.FilePermissions(0400))
+		files.Ownership(uid, gid),
+		files.Permissions(0400))
 }
 
 func generateConf(port uint16, password string) (data []byte) {
diff --git a/internal/tinyproxy/conf.go b/internal/tinyproxy/conf.go
index d1ae854b..963a3b3f 100644
--- a/internal/tinyproxy/conf.go
+++ b/internal/tinyproxy/conf.go
@@ -14,8 +14,8 @@ func (c *configurator) MakeConf(logLevel models.TinyProxyLogLevel, port uint16,
 	lines := generateConf(logLevel, port, user, password)
 	return c.fileManager.WriteLinesToFile(string(constants.TinyProxyConf),
 		lines,
-		files.FileOwnership(uid, gid),
-		files.FilePermissions(0400))
+		files.Ownership(uid, gid),
+		files.Permissions(0400))
 }
 
 func generateConf(logLevel models.TinyProxyLogLevel, port uint16, user, password string) (lines []string) {