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cgroup: store the result of IsRunningSystemd 

Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>
This commit is contained in:
Giuseppe Scrivano 2020-07-05 12:41:01 +02:00
parent 3cb1909c70
commit 2deaeab08f
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GPG Key ID: E4730F97F60286ED
1 changed files with 8 additions and 5 deletions
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13
libcontainer/cgroups/systemd/common.go
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@ -27,6 +27,9 @@ var (
versionOnce sync.Once
version int
versionErr error
isRunningSystemdOnce sync.Once
isRunningSystemd bool
)
// NOTE: This function comes from package github.com/coreos/go-systemd/util
@ -37,11 +40,11 @@ var (
// checks whether /run/systemd/system/ exists and is a directory.
// http://www.freedesktop.org/software/systemd/man/sd_booted.html
func IsRunningSystemd() bool {
fi, err := os.Lstat("/run/systemd/system")
if err != nil {
return false
}
return fi.IsDir()
isRunningSystemdOnce.Do(func() {
fi, err := os.Lstat("/run/systemd/system")
isRunningSystemd = err == nil && fi.IsDir()
})
return isRunningSystemd
}
// systemd represents slice hierarchy using `-`, so we need to follow suit when