pkg/systemd: move to internal/cri

This pacakge is only used internally in the cri package, which is an internal
packages, so we can make the utility internal as well.

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

pkg/systemd/util.go

@@ -1,58 +0,0 @@
-//go:build linux
-
-/*
-   Copyright The containerd Authors.
-
-   Licensed under the Apache License, Version 2.0 (the "License");
-   you may not use this file except in compliance with the License.
-   You may obtain a copy of the License at
-
-       http://www.apache.org/licenses/LICENSE-2.0
-
-   Unless required by applicable law or agreed to in writing, software
-   distributed under the License is distributed on an "AS IS" BASIS,
-   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-   See the License for the specific language governing permissions and
-   limitations under the License.
-*/
-
-// Copyright 2015 CoreOS, Inc.
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//     http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-package systemd
-
-import (
-	"os"
-	"sync"
-)
-
-var (
-	runningSystemd bool
-	detectSystemd  sync.Once
-)
-
-// IsRunningSystemd checks whether the host was booted with systemd as its init
-// system. This functions similarly to systemd's `sd_booted(3)`: internally, it
-// checks whether /run/systemd/system/ exists and is a directory.
-// https://github.com/coreos/go-systemd/blob/d843340ab4bd3815fda02e648f9b09ae2dc722a7/util/util.go#L68-L78
-func IsRunningSystemd() bool {
-	detectSystemd.Do(func() {
-		fi, err := os.Lstat("/run/systemd/system")
-		if err != nil {
-			return
-		}
-		runningSystemd = fi.IsDir()
-	})
-	return runningSystemd
-}