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overlay2: account for UserNS/userxattr in metacopy test

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Signed-off-by: Bjorn Neergaard <bneergaard@mirantis.com>
This commit is contained in:
Bjorn Neergaard 2022-05-12 11:25:05 -06:00
parent 2c3d1f7b4b
commit ce3e2d1955
2 changed files with 31 additions and 3 deletions
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22
daemon/graphdriver/overlay2/check.go
View file

@ -12,6 +12,7 @@ import (
"github.com/containerd/containerd/mount"
"github.com/containerd/containerd/pkg/userns"
"github.com/docker/docker/daemon/graphdriver/overlayutils"
"github.com/docker/docker/pkg/system"
"github.com/pkg/errors"
"golang.org/x/sys/unix"
@ -126,6 +127,17 @@ func doesSupportNativeDiff(d string) error {
// metacopy. Nonetheless, a user or kernel distributor may enable metacopy, so
// we should report in the daemon whether or not we detect its use.
func usingMetacopy(d string) (bool, error) {
userxattr := false
if userns.RunningInUserNS() {
needed, err := overlayutils.NeedsUserXAttr(d)
if err != nil {
return false, err
}
if needed {
userxattr = true
}
}
td, err := os.MkdirTemp(d, "metacopy-check")
if err != nil {
return false, err
@ -148,11 +160,15 @@ func usingMetacopy(d string) (bool, error) {
return false, err
}
opts := fmt.Sprintf("lowerdir=%s,upperdir=%s,workdir=%s", l1, l2, work)
opts := []string{fmt.Sprintf("lowerdir=%s,upperdir=%s,workdir=%s", l1, l2, work)}
if userxattr {
opts = append(opts, "userxattr")
}
m := mount.Mount{
Type: "overlay",
Source: "overlay",
Options: []string{opts},
Options: opts,
}
if err := m.Mount(merged); err != nil {
@ -170,7 +186,7 @@ func usingMetacopy(d string) (bool, error) {
}
// ...and check if the pulled-up copy is marked as metadata-only
xattr, err := system.Lgetxattr(filepath.Join(l2, "f"), "trusted.overlay.metacopy")
xattr, err := system.Lgetxattr(filepath.Join(l2, "f"), overlayutils.GetOverlayXattr("metacopy"))
if err != nil {
return false, errors.Wrap(err, "metacopy flag was not set on file in the upperdir")
}

12
daemon/graphdriver/overlayutils/overlayutils.go
View file

@ -9,6 +9,7 @@ import (
"path"
"path/filepath"
"github.com/containerd/containerd/pkg/userns"
"github.com/docker/docker/daemon/graphdriver"
"github.com/pkg/errors"
"github.com/sirupsen/logrus"
@ -77,3 +78,14 @@ func SupportsOverlay(d string, checkMultipleLowers bool) error {
}
return nil
}
// GetOverlayXattr combines the overlay module's xattr class with the named
// xattr -- `user` when mounted inside a user namespace, and `trusted` when
// mounted in the 'root' namespace.
func GetOverlayXattr(name string) string {
class := "trusted"
if userns.RunningInUserNS() {
class = "user"
}
return fmt.Sprintf("%s.overlay.%s", class, name)
}