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|
//go:build systemd && cgo
package config
import (
"os"
"path/filepath"
"strings"
"sync"
"github.com/containers/common/pkg/cgroupv2"
"github.com/containers/storage/pkg/unshare"
)
var (
systemdOnce sync.Once
usesSystemd bool
journaldOnce sync.Once
usesJournald bool
)
const (
// DefaultLogDriver is the default type of log files
DefaultLogDriver = "journald"
)
func defaultCgroupManager() string {
if !useSystemd() {
return CgroupfsCgroupsManager
}
enabled, err := cgroupv2.Enabled()
if err == nil && !enabled && unshare.IsRootless() {
return CgroupfsCgroupsManager
}
return SystemdCgroupsManager
}
func defaultEventsLogger() string {
if useJournald() {
return "journald"
}
return "file"
}
func defaultLogDriver() string {
if useJournald() {
return "journald"
}
return "k8s-file"
}
func useSystemd() bool {
systemdOnce.Do(func() {
dat, err := os.ReadFile("/proc/1/comm")
if err == nil {
val := strings.TrimSuffix(string(dat), "\n")
usesSystemd = (val == "systemd")
}
})
return usesSystemd
}
func useJournald() bool {
journaldOnce.Do(func() {
if !useSystemd() {
return
}
for _, root := range []string{"/run/log/journal", "/var/log/journal"} {
dirs, err := os.ReadDir(root)
if err != nil {
continue
}
for _, d := range dirs {
if d.IsDir() {
if _, err := os.ReadDir(filepath.Join(root, d.Name())); err == nil {
usesJournald = true
return
}
}
}
}
})
return usesJournald
}
|
