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empty-dir: Fix bug in the way empty-dirs are handled for overlay

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With #1485, we moved the default medium empty-dir creation to the
sandbox rootfs. This worked for devicemapper, but in case of overlay
the "local" directory was being created outside the sandbox rootfs.
As a result we were seeing the behaviour seen in #1818.

Fixes #1818

Signed-off-by: Archana Shinde <archana.m.shinde@intel.com>
This commit is contained in:
Archana Shinde 2019-06-24 17:24:50 +00:00
parent 1858c4da2c
commit 57136faa38
2 changed files with 27 additions and 3 deletions
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6
virtcontainers/kata_agent.go
View File

@ -1173,7 +1173,7 @@ func (k *kataAgent) createContainer(sandbox *Sandbox, c *Container) (p *Process,
epheStorages := k.handleEphemeralStorage(ociSpec.Mounts)
ctrStorages = append(ctrStorages, epheStorages...)
localStorages := k.handleLocalStorage(ociSpec.Mounts, sandbox.id)
localStorages := k.handleLocalStorage(ociSpec.Mounts, sandbox.id, c.rootfsSuffix)
ctrStorages = append(ctrStorages, localStorages...)
// We replace all OCI mount sources that match our container mount
@ -1285,7 +1285,7 @@ func (k *kataAgent) handleEphemeralStorage(mounts []specs.Mount) []*grpc.Storage
// handleLocalStorage handles local storage within the VM
// by creating a directory in the VM from the source of the mount point.
func (k *kataAgent) handleLocalStorage(mounts []specs.Mount, sandboxID string) []*grpc.Storage {
func (k *kataAgent) handleLocalStorage(mounts []specs.Mount, sandboxID string, rootfsSuffix string) []*grpc.Storage {
var localStorages []*grpc.Storage
for idx, mnt := range mounts {
if mnt.Type == KataLocalDevType {
@ -1294,7 +1294,7 @@ func (k *kataAgent) handleLocalStorage(mounts []specs.Mount, sandboxID string) [
// We rely on the fact that the first container in the VM has the same ID as the sandbox ID.
// In Kubernetes, this is usually the pause container and we depend on it existing for
// local directories to work.
mounts[idx].Source = filepath.Join(kataGuestSharedDir, sandboxID, KataLocalDevType, filepath.Base(mnt.Source))
mounts[idx].Source = filepath.Join(kataGuestSharedDir, sandboxID, rootfsSuffix, KataLocalDevType, filepath.Base(mnt.Source))
// Create a storage struct so that the kata agent is able to create the
// directory inside the VM.

24
virtcontainers/kata_agent_test.go
View File

@ -382,6 +382,30 @@ func TestHandleEphemeralStorage(t *testing.T) {
"Ephemeral mount point didn't match: got %s, expecting %s", epheMountPoint, expected)
}
func TestHandleLocalStorage(t *testing.T) {
k := kataAgent{}
var ociMounts []specs.Mount
mountSource := "mountPoint"
mount := specs.Mount{
Type: KataLocalDevType,
Source: mountSource,
}
sandboxID := "sandboxid"
rootfsSuffix := "rootfs"
ociMounts = append(ociMounts, mount)
localStorages := k.handleLocalStorage(ociMounts, sandboxID, rootfsSuffix)
assert.NotNil(t, localStorages)
assert.Equal(t, len(localStorages), 1)
localMountPoint := localStorages[0].GetMountPoint()
expected := filepath.Join(kataGuestSharedDir, sandboxID, rootfsSuffix, KataLocalDevType, filepath.Base(mountSource))
assert.Equal(t, localMountPoint, expected)
}
func TestAppendDevicesEmptyContainerDeviceList(t *testing.T) {
k := kataAgent{}