func doInstall(s *state.State, curActive bool, snapName, snapPath, channel string, userID int, flags snappy.InstallFlags) (*state.TaskSet, error) {
if err := checkChangeConflict(s, snapName); err != nil {
return nil, err
}
if snapPath == "" && channel == "" {
channel = "stable"
}
var prepare *state.Task
ss := SnapSetup{
Channel: channel,
UserID: userID,
Flags: int(flags),
}
ss.Name = snapName
ss.SnapPath = snapPath
if snapPath != "" {
prepare = s.NewTask("prepare-snap", fmt.Sprintf(i18n.G("Prepare snap %q"), snapPath))
} else {
prepare = s.NewTask("download-snap", fmt.Sprintf(i18n.G("Download snap %q from channel %q"), snapName, channel))
}
prepare.Set("snap-setup", ss)
tasks := []*state.Task{prepare}
addTask := func(t *state.Task) {
t.Set("snap-setup-task", prepare.ID())
tasks = append(tasks, t)
}
// mount
mount := s.NewTask("mount-snap", fmt.Sprintf(i18n.G("Mount snap %q"), snapName))
addTask(mount)
mount.WaitFor(prepare)
precopy := mount
if curActive {
// unlink-current-snap (will stop services for copy-data)
unlink := s.NewTask("unlink-current-snap", fmt.Sprintf(i18n.G("Make current revision for snap %q unavailable"), snapName))
addTask(unlink)
unlink.WaitFor(mount)
precopy = unlink
}
// copy-data (needs stopped services by unlink)
copyData := s.NewTask("copy-snap-data", fmt.Sprintf(i18n.G("Copy snap %q data"), snapName))
addTask(copyData)
copyData.WaitFor(precopy)
// security
setupSecurity := s.NewTask("setup-profiles", fmt.Sprintf(i18n.G("Setup snap %q security profiles"), snapName))
addTask(setupSecurity)
setupSecurity.WaitFor(copyData)
// finalize (wrappers+current symlink)
linkSnap := s.NewTask("link-snap", fmt.Sprintf(i18n.G("Make snap %q available to the system"), snapName))
addTask(linkSnap)
linkSnap.WaitFor(setupSecurity)
return state.NewTaskSet(tasks...), nil
}