// downloadTargets downloads all targets and delegated targets for the repository.
// It uses a pre-order tree traversal as it's necessary to download parents first
// to obtain the keys to validate children.
func (c *Client) downloadTargets(role string) error {
logrus.Debug("Downloading Targets...")
stack := utils.NewStack()
stack.Push(role)
for !stack.Empty() {
role, err := stack.PopString()
if err != nil {
return err
}
if c.local.Snapshot == nil {
return ErrMissingMeta{role: role}
}
snap := c.local.Snapshot.Signed
root := c.local.Root.Signed
r := c.keysDB.GetRole(role)
if r == nil {
return fmt.Errorf("Invalid role: %s", role)
}
keyIDs := r.KeyIDs
s, err := c.getTargetsFile(role, keyIDs, snap.Meta, root.ConsistentSnapshot, r.Threshold)
if err != nil {
if _, ok := err.(ErrMissingMeta); ok && role != data.CanonicalTargetsRole {
// if the role meta hasn't been published,
// that's ok, continue
continue
}
logrus.Error("Error getting targets file:", err)
return err
}
t, err := data.TargetsFromSigned(s)
if err != nil {
return err
}
err = c.local.SetTargets(role, t)
if err != nil {
return err
}
// push delegated roles contained in the targets file onto the stack
for _, r := range t.Signed.Delegations.Roles {
stack.Push(r.Name)
}
}
return nil
}
// downloadTargets downloads all targets and delegated targets for the repository.
// It uses a pre-order tree traversal as it's necessary to download parents first
// to obtain the keys to validate children.
func (c *Client) downloadTargets(role string) error {
logrus.Debug("Downloading Targets...")
stack := utils.NewStack()
stack.Push(role)
for !stack.Empty() {
role, err := stack.PopString()
if err != nil {
return err
}
if c.local.Snapshot == nil {
return tuf.ErrNotLoaded{Role: data.CanonicalSnapshotRole}
}
snap := c.local.Snapshot.Signed
root := c.local.Root.Signed
s, err := c.getTargetsFile(role, snap.Meta, root.ConsistentSnapshot)
if err != nil {
if _, ok := err.(data.ErrMissingMeta); ok && role != data.CanonicalTargetsRole {
// if the role meta hasn't been published,
// that's ok, continue
continue
}
logrus.Error("Error getting targets file:", err)
return err
}
t, err := data.TargetsFromSigned(s, role)
if err != nil {
return err
}
err = c.local.SetTargets(role, t)
if err != nil {
return err
}
// push delegated roles contained in the targets file onto the stack
for _, r := range t.Signed.Delegations.Roles {
if path.Dir(r.Name) == role {
// only load children that are direct 1st generation descendants
// of the role we've just downloaded
stack.Push(r.Name)
}
}
}
return nil
}