5d31e93787
This brings over the enhancement from a506630e57.
We don't expect the systemd state to change while containerd is running,
so we can use a `sync.Once` for this, to prevent stat'ing each time.
Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
59 lines
1.8 KiB
Go
59 lines
1.8 KiB
Go
//go:build linux
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/*
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Copyright The containerd Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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// Copyright 2015 CoreOS, Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package systemd
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import (
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"os"
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"sync"
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)
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var (
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runningSystemd bool
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detectSystemd sync.Once
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)
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// IsRunningSystemd checks whether the host was booted with systemd as its init
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// system. This functions similarly to systemd's `sd_booted(3)`: internally, it
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// checks whether /run/systemd/system/ exists and is a directory.
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// https://github.com/coreos/go-systemd/blob/d843340ab4bd3815fda02e648f9b09ae2dc722a7/util/util.go#L68-L78
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func IsRunningSystemd() bool {
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detectSystemd.Do(func() {
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fi, err := os.Lstat("/run/systemd/system")
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if err != nil {
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return
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}
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runningSystemd = fi.IsDir()
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})
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return runningSystemd
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}
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