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virtcontainers: Check file sharing support

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If the hypervisor does not support filesystem sharing (for example, 9p),
files will be copied over gRPC using the copyFile request function.

Signed-off-by: Julio Montes <julio.montes@intel.com>
This commit is contained in:
Julio Montes 2018-12-19 08:52:37 -06:00
parent 62917621c2
commit bc31844106
1 changed files with 28 additions and 15 deletions
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43
virtcontainers/kata_agent.go
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@ -255,7 +255,14 @@ func (k *kataAgent) configure(h hypervisor, id, sharePath string, builtin bool,
k.proxyBuiltIn = true
}
// Adding the shared volume.
// Neither create shared directory nor add 9p device if hypervisor
// doesn't support filesystem sharing.
caps := h.capabilities()
if !caps.isFsSharingSupported() {
return nil
}
// Create shared directory and add the shared volume if filesystem sharing is supported.
// This volume contains all bind mounted container bundles.
sharedVolume := Volume{
MountTag: mountGuest9pTag,
@ -615,23 +622,29 @@ func (k *kataAgent) startSandbox(sandbox *Sandbox) error {
return err
}
sharedDir9pOptions = append(sharedDir9pOptions, fmt.Sprintf("msize=%d", sandbox.config.HypervisorConfig.Msize9p))
storages := []*grpc.Storage{}
caps := sandbox.hypervisor.capabilities()
// We mount the shared directory in a predefined location
// in the guest.
// This is where at least some of the host config files
// (resolv.conf, etc...) and potentially all container
// rootfs will reside.
sharedVolume := &grpc.Storage{
Driver: kata9pDevType,
Source: mountGuest9pTag,
MountPoint: kataGuestSharedDir,
Fstype: type9pFs,
Options: sharedDir9pOptions,
// append 9p shared volume to storages only if filesystem sharing is supported
if caps.isFsSharingSupported() {
sharedDir9pOptions = append(sharedDir9pOptions, fmt.Sprintf("msize=%d", sandbox.config.HypervisorConfig.Msize9p))
// We mount the shared directory in a predefined location
// in the guest.
// This is where at least some of the host config files
// (resolv.conf, etc...) and potentially all container
// rootfs will reside.
sharedVolume := &grpc.Storage{
Driver: kata9pDevType,
Source: mountGuest9pTag,
MountPoint: kataGuestSharedDir,
Fstype: type9pFs,
Options: sharedDir9pOptions,
}
storages = append(storages, sharedVolume)
}
storages := []*grpc.Storage{sharedVolume}
if sandbox.shmSize > 0 {
path := filepath.Join(kataGuestSandboxDir, shmDir)
shmSizeOption := fmt.Sprintf("size=%d", sandbox.shmSize)