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package libpod
import (
"path/filepath"
"github.com/containers/storage"
"github.com/pkg/errors"
)
// RenumberLocks reassigns lock numbers for all containers, pods, and volumes in
// the state.
// It renders the runtime it is called on, and all container/pod/volume structs
// from that runtime, unusable, and requires that a new runtime be initialized
// after it is called.
// TODO: It would be desirable to make it impossible to call this until all
// other libpod sessions are dead.
// Possibly use a read-write file lock, with all non-renumber podmans owning the
// lock as read, renumber attempting to take a write lock?
// The alternative is some sort of session tracking, and I don't know how
// reliable that can be.
func (r *Runtime) RenumberLocks() error {
r.lock.Lock()
locked := true
defer func() {
if locked {
r.lock.Unlock()
}
}()
runtimeAliveLock := filepath.Join(r.config.TmpDir, "alive.lck")
aliveLock, err := storage.GetLockfile(runtimeAliveLock)
if err != nil {
return errors.Wrapf(err, "error acquiring runtime init lock")
}
aliveLock.Lock()
// It's OK to defer until Shutdown() has run, so no need to check locked
defer aliveLock.Unlock()
// Start off by deallocating all locks
if err := r.lockManager.FreeAllLocks(); err != nil {
return err
}
allCtrs, err := r.state.AllContainers()
if err != nil {
return err
}
for _, ctr := range allCtrs {
lock, err := r.lockManager.AllocateLock()
if err != nil {
return errors.Wrapf(err, "error allocating lock for container %s", ctr.ID())
}
ctr.config.LockID = lock.ID()
// Write the new lock ID
if err := r.state.RewriteContainerConfig(ctr, ctr.config); err != nil {
return err
}
}
allPods, err := r.state.AllPods()
if err != nil {
return err
}
for _, pod := range allPods {
lock, err := r.lockManager.AllocateLock()
if err != nil {
return errors.Wrapf(err, "error allocating lock for pod %s", pod.ID())
}
pod.config.LockID = lock.ID()
// Write the new lock ID
if err := r.state.RewritePodConfig(pod, pod.config); err != nil {
return err
}
}
r.lock.Unlock()
locked = false
return r.Shutdown(false)
}
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