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 }