Add ability to retrieve container's log path to API

Signed-off-by: Matthew Heon <matthew.heon@gmail.com>

Closes: #56
Approved by: rhatdan

libpod/container.go

@@ -150,6 +150,14 @@ func (c *Container) Labels() map[string]string {
 	return labels
 }
 
+// LogPath returns the path to the container's log file
+// This file will only be present after Init() is called to create the container
+// in runc
+func (c *Container) LogPath() string {
+	// TODO store this in state and allow overriding
+	return c.logPath()
+}
+
 // State returns the current state of the container
 func (c *Container) State() (ContainerState, error) {
 	c.lock.Lock()
@@ -181,6 +189,11 @@ func (c *Container) bundlePath() string {
 	return c.state.RunDir
 }
 
+// The path to the container's logs file
+func (c *Container) logPath() string {
+	return filepath.Join(c.config.StaticDir, "ctr.log")
+}
+
 // Retrieves the path of the container's attach socket
 func (c *Container) attachSocketPath() string {
 	return filepath.Join(c.runtime.ociRuntime.socketsDir, c.ID(), "attach")

libpod/oci.go

@@ -139,7 +139,7 @@ func (r *OCIRuntime) createContainer(ctr *Container, cgroupParent string) error
 	args = append(args, "-p", filepath.Join(ctr.state.RunDir, "pidfile"))
 	// TODO container log location should be configurable
 	// The default also likely shouldn't be this
-	args = append(args, "-l", filepath.Join(ctr.config.StaticDir, "ctr.log"))
+	args = append(args, "-l", ctr.logPath())
 	args = append(args, "--exit-dir", r.exitsDir)
 	args = append(args, "--socket-dir-path", r.socketsDir)
 	if ctr.config.Spec.Process.Terminal {