// Note that `reservationPrincipal` should be specified if and only if
// the volume uses dynamically reserved resources.
inline Resource createPersistentVolume(
Resource volume,
const std::string& persistenceId,
const std::string& containerPath,
const Option<std::string>& reservationPrincipal = None())
{
Option<Resource::DiskInfo::Source> source = None();
if (volume.has_disk() && volume.disk().has_source()) {
source = volume.disk().source();
}
volume.mutable_disk()->CopyFrom(
createDiskInfo(persistenceId, containerPath, None(), None(), source));
if (reservationPrincipal.isSome()) {
volume.mutable_reservation()->set_principal(reservationPrincipal.get());
}
return volume;
}
string getPersistentVolumePath(
const string& rootDir,
const Resource& volume)
{
CHECK(volume.has_role());
CHECK(volume.has_disk());
CHECK(volume.disk().has_persistence());
// If no `source` is provided in `DiskInfo` volumes are mapped into
// the `rootDir`.
if (!volume.disk().has_source()) {
return getPersistentVolumePath(
rootDir,
volume.role(),
volume.disk().persistence().id());
}
// If a `source` was provided for the volume, we map it according
// to the `type` of disk. Currently only the `PATH` and 'MOUNT'
// types are supported.
if (volume.disk().source().type() == Resource::DiskInfo::Source::PATH) {
// For `PATH` we mount a directory inside the `root`.
CHECK(volume.disk().source().has_path());
return getPersistentVolumePath(
volume.disk().source().path().root(),
volume.role(),
volume.disk().persistence().id());
} else if (
volume.disk().source().type() == Resource::DiskInfo::Source::MOUNT) {
// For `MOUNT` we map straight onto the root of the mount.
CHECK(volume.disk().source().has_mount());
return volume.disk().source().mount().root();
}
UNREACHABLE();
}
