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pkg/systemd: use sync.Once for systemd detection

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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>
This commit is contained in:
Sebastiaan van Stijn 2023-09-01 12:14:56 +02:00
parent 7d0ab4fc2c
commit 5d31e93787
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GPG Key ID: 76698F39D527CE8C
1 changed files with 17 additions and 6 deletions
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23
pkg/systemd/util.go
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@ -32,16 +32,27 @@
package systemd package systemd
import "os" import (
"os"
"sync"
)
var (
runningSystemd bool
detectSystemd sync.Once
)
// IsRunningSystemd checks whether the host was booted with systemd as its init // IsRunningSystemd checks whether the host was booted with systemd as its init
// system. This functions similarly to systemd's `sd_booted(3)`: internally, it // system. This functions similarly to systemd's `sd_booted(3)`: internally, it
// checks whether /run/systemd/system/ exists and is a directory. // checks whether /run/systemd/system/ exists and is a directory.
// https://github.com/coreos/go-systemd/blob/d843340ab4bd3815fda02e648f9b09ae2dc722a7/util/util.go#L68-L78 // https://github.com/coreos/go-systemd/blob/d843340ab4bd3815fda02e648f9b09ae2dc722a7/util/util.go#L68-L78
func IsRunningSystemd() bool { func IsRunningSystemd() bool {
fi, err := os.Lstat("/run/systemd/system") detectSystemd.Do(func() {
if err != nil { fi, err := os.Lstat("/run/systemd/system")
return false if err != nil {
} return
return fi.IsDir() }
runningSystemd = fi.IsDir()
})
return runningSystemd
} }