container: new package

container/container.go

+package container
+
+import (
+        "fmt"
+        "launchpad.net/juju-core/juju/state"
+        "launchpad.net/juju-core/juju/upstart"
+        "os/exec"
+        "strings"
+)
+
+// Container contains running juju service units.
+type Container interface {
+        Deploy() error
+        Destroy() error
+}
+
+// TODO:
+//type lxc struct {
+//      name string
+//}
+//
+//func LXC(args...) Container {
+//}
+
+type simple struct {
+        unit *state.Unit
+}
+
+func Simple(unit *state.Unit) Container {
+        return &simple{unit}
+}
+
+func deslash(s string) string {
+        return strings.Replace(s, "/", "-", -1)
+}
+
+func (s *simple) service() *upstart.Service {
+        return upstart.NewService(deslash(s.unit.Name()))
+}
+
+func (s *simple) Deploy() error {
+        exe, err := exec.LookPath("jujud")
+        if err != nil {
+                return fmt.Errorf("cannot find executable: %v", err)
+        }
+        conf := &upstart.Conf{
+                Service: *s.service(),
+                Desc:    "juju unit agent for " + s.unit.Name(),
+                Cmd:     exe + " unit --unit-name " + s.unit.Name(),
+                // TODO: Out
+        }
+        return conf.Install()
+}
+
+func (s *simple) Destroy() error {
+        // TODO what, if any, directory do we need to delete?
+        return s.service().Remove()
+}
+