libcontainer/system: remove unused GetParentNSeuid()

This function was added in f103de57ec, but no
longer used since 06f789cf26 (v1.0.0-rc6)

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>

libcontainer/system/linux.go

@@ -3,7 +3,6 @@
 package system
 
 import (
-	"os"
 	"os/exec"
 	"sync"
 	"unsafe"
@@ -117,22 +116,6 @@ func UIDMapInUserNS(uidmap []user.IDMap) bool {
 	return true
 }
 
-// GetParentNSeuid returns the euid within the parent user namespace
-func GetParentNSeuid() int64 {
-	euid := int64(os.Geteuid())
-	uidmap, err := user.CurrentProcessUIDMap()
-	if err != nil {
-		// This kernel-provided file only exists if user namespaces are supported
-		return euid
-	}
-	for _, um := range uidmap {
-		if um.ID <= euid && euid <= um.ID+um.Count-1 {
-			return um.ParentID + euid - um.ID
-		}
-	}
-	return euid
-}
-
 // SetSubreaper sets the value i as the subreaper setting for the calling process
 func SetSubreaper(i int) error {
 	return unix.Prctl(unix.PR_SET_CHILD_SUBREAPER, uintptr(i), 0, 0, 0)

libcontainer/system/unsupported.go

@@ -3,8 +3,6 @@
 package system
 
 import (
-	"os"
-
 	"github.com/opencontainers/runc/libcontainer/user"
 )
 
@@ -19,9 +17,3 @@ func RunningInUserNS() bool {
 func UIDMapInUserNS(uidmap []user.IDMap) bool {
 	return false
 }
-
-// GetParentNSeuid returns the euid within the parent user namespace
-// Always returns os.Geteuid on non-linux
-func GetParentNSeuid() int {
-	return os.Geteuid()
-}