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package requirement // import "github.com/docker/docker/integration/internal/requirement"
import (
"os"
"strings"
"github.com/docker/docker/pkg/parsers/kernel"
"gotest.tools/v3/icmd"
)
// CgroupNamespacesEnabled checks if cgroup namespaces are enabled on this host
func CgroupNamespacesEnabled() bool {
if _, err := os.Stat("/proc/self/ns/cgroup"); os.IsNotExist(err) {
return false
}
return true
}
func overlayFSSupported() bool {
result := icmd.RunCommand("/bin/sh", "-c", "cat /proc/filesystems")
if result.Error != nil {
return false
}
return strings.Contains(result.Combined(), "overlay\n")
}
// Overlay2Supported returns true if the current system supports overlay2 as graphdriver
func Overlay2Supported(kernelVersion string) bool {
if !overlayFSSupported() {
return false
}
daemonV, err := kernel.ParseRelease(kernelVersion)
if err != nil {
return false
}
requiredV := kernel.VersionInfo{Kernel: 4}
return kernel.CompareKernelVersion(*daemonV, requiredV) > -1
}
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