1 files changed, 177 insertions, 0 deletions
diff --git a/libpod/pod_internal.go b/libpod/pod_internal.go
new file mode 100644
index 000000000..c8d8405bb
--- /dev/null
+++ b/libpod/pod_internal.go
@@ -0,0 +1,177 @@
+package libpod
+
+import (
+	"context"
+	"path/filepath"
+	"strings"
+	"time"
+
+	"github.com/containers/storage"
+	"github.com/containers/storage/pkg/stringid"
+	"github.com/pkg/errors"
+	"github.com/sirupsen/logrus"
+)
+
+// Creates a new, empty pod
+func newPod(lockDir string, runtime *Runtime) (*Pod, error) {
+	pod := new(Pod)
+	pod.config = new(PodConfig)
+	pod.config.ID = stringid.GenerateNonCryptoID()
+	pod.config.Labels = make(map[string]string)
+	pod.config.CreatedTime = time.Now()
+	pod.state = new(podState)
+	pod.runtime = runtime
+
+	// Path our lock file will reside at
+	lockPath := filepath.Join(lockDir, pod.config.ID)
+	// Grab a lockfile at the given path
+	lock, err := storage.GetLockfile(lockPath)
+	if err != nil {
+		return nil, errors.Wrapf(err, "error creating lockfile for new pod")
+	}
+	pod.lock = lock
+
+	return pod, nil
+}
+
+// Update pod state from database
+func (p *Pod) updatePod() error {
+	if err := p.runtime.state.UpdatePod(p); err != nil {
+		return err
+	}
+
+	return nil
+}
+
+// Save pod state to database
+func (p *Pod) save() error {
+	if err := p.runtime.state.SavePod(p); err != nil {
+		return errors.Wrapf(err, "error saving pod %s state")
+	}
+
+	return nil
+}
+
+// Refresh a pod's state after restart
+func (p *Pod) refresh() error {
+	// Need to to an update from the DB to pull potentially-missing state
+	if err := p.runtime.state.UpdatePod(p); err != nil {
+		return err
+	}
+
+	if !p.valid {
+		return ErrPodRemoved
+	}
+
+	// We need to recreate the pod's cgroup
+	if p.config.UsePodCgroup {
+		switch p.runtime.config.CgroupManager {
+		case SystemdCgroupsManager:
+			// NOOP for now, until proper systemd cgroup management
+			// is implemented
+		case CgroupfsCgroupsManager:
+			p.state.CgroupPath = filepath.Join(p.config.CgroupParent, p.ID())
+
+			logrus.Debugf("setting pod cgroup to %s", p.state.CgroupPath)
+		default:
+			return errors.Wrapf(ErrInvalidArg, "unknown cgroups manager %s specified", p.runtime.config.CgroupManager)
+		}
+	}
+
+	// Save changes
+	return p.save()
+}
+
+// Visit a node on a container graph and start the container, or set an error if
+// a dependency failed to start. if restart is true, startNode will restart the node instead of starting it.
+func startNode(ctx context.Context, node *containerNode, setError bool, ctrErrors map[string]error, ctrsVisited map[string]bool, restart bool) {
+	// First, check if we have already visited the node
+	if ctrsVisited[node.id] {
+		return
+	}
+
+	// If setError is true, a dependency of us failed
+	// Mark us as failed and recurse
+	if setError {
+		// Mark us as visited, and set an error
+		ctrsVisited[node.id] = true
+		ctrErrors[node.id] = errors.Wrapf(ErrCtrStateInvalid, "a dependency of container %s failed to start", node.id)
+
+		// Hit anyone who depends on us, and set errors on them too
+		for _, successor := range node.dependedOn {
+			startNode(ctx, successor, true, ctrErrors, ctrsVisited, restart)
+		}
+
+		return
+	}
+
+	// Have all our dependencies started?
+	// If not, don't visit the node yet
+	depsVisited := true
+	for _, dep := range node.dependsOn {
+		depsVisited = depsVisited && ctrsVisited[dep.id]
+	}
+	if !depsVisited {
+		// Don't visit us yet, all dependencies are not up
+		// We'll hit the dependencies eventually, and when we do it will
+		// recurse here
+		return
+	}
+
+	// Going to try to start the container, mark us as visited
+	ctrsVisited[node.id] = true
+
+	ctrErrored := false
+
+	// Check if dependencies are running
+	// Graph traversal means we should have started them
+	// But they could have died before we got here
+	// Does not require that the container be locked, we only need to lock
+	// the dependencies
+	depsStopped, err := node.container.checkDependenciesRunning()
+	if err != nil {
+		ctrErrors[node.id] = err
+		ctrErrored = true
+	} else if len(depsStopped) > 0 {
+		// Our dependencies are not running
+		depsList := strings.Join(depsStopped, ",")
+		ctrErrors[node.id] = errors.Wrapf(ErrCtrStateInvalid, "the following dependencies of container %s are not running: %s", node.id, depsList)
+		ctrErrored = true
+	}
+
+	// Lock before we start
+	node.container.lock.Lock()
+
+	// Sync the container to pick up current state
+	if !ctrErrored {
+		if err := node.container.syncContainer(); err != nil {
+			ctrErrored = true
+			ctrErrors[node.id] = err
+		}
+	}
+
+	// Start the container (only if it is not running)
+	if !ctrErrored {
+		if !restart && node.container.state.State != ContainerStateRunning {
+			if err := node.container.initAndStart(ctx); err != nil {
+				ctrErrored = true
+				ctrErrors[node.id] = err
+			}
+		}
+		if restart && node.container.state.State != ContainerStatePaused && node.container.state.State != ContainerStateUnknown {
+			if err := node.container.restartWithTimeout(ctx, node.container.config.StopTimeout); err != nil {
+				ctrErrored = true
+				ctrErrors[node.id] = err
+			}
+		}
+	}
+
+	node.container.lock.Unlock()
+
+	// Recurse to anyone who depends on us and start them
+	for _, successor := range node.dependedOn {
+		startNode(ctx, successor, ctrErrored, ctrErrors, ctrsVisited, restart)
+	}
+
+	return
+}