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package types
import (
"os/exec"
"strconv"
"strings"
"golang.org/x/sys/unix"
)
const (
// these are default path for run and graph root for rootful users
// for rootless path is constructed via getRootlessStorageOpts
defaultRunRoot string = "/run/containers/storage"
defaultGraphRoot string = "/var/lib/containers/storage"
SystemConfigFile = "/usr/share/containers/storage.conf"
)
// defaultConfigFile path to the system wide storage.conf file
var (
defaultOverrideConfigFile = "/etc/containers/storage.conf"
)
// canUseRootlessOverlay returns true if the overlay driver can be used for rootless containers
func canUseRootlessOverlay() bool {
// we check first for fuse-overlayfs since it is cheaper.
if path, _ := exec.LookPath("fuse-overlayfs"); path != "" {
return true
}
// We cannot use overlay.SupportsNativeOverlay since canUseRootlessOverlay is called by Podman
// before we enter the user namespace and the driver we pick here is written in the podman database.
// Checking the kernel version is usually not a good idea since the feature could be back-ported, e.g. RHEL
// but this is just an heuristic and on RHEL we always install the storage.conf file.
// native overlay for rootless was added upstream in 5.13 (at least the first version that we support), so check
// that the kernel is >= 5.13.
var uts unix.Utsname
if err := unix.Uname(&uts); err == nil {
parts := strings.Split(string(uts.Release[:]), ".")
major, _ := strconv.Atoi(parts[0])
if major >= 6 {
return true
}
if major == 5 && len(parts) > 1 {
minor, _ := strconv.Atoi(parts[1])
if minor >= 13 {
return true
}
}
}
return false
}
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