DockerCLI/vendor/github.com/docker/notary/client/witness.go

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package client
import (
"path/filepath"
"github.com/docker/notary/client/changelist"
"github.com/docker/notary/tuf"
"github.com/docker/notary/tuf/data"
)
// Witness creates change objects to witness (i.e. re-sign) the given
// roles on the next publish. One change is created per role
func (r *NotaryRepository) Witness(roles ...string) ([]string, error) {
cl, err := changelist.NewFileChangelist(filepath.Join(r.tufRepoPath, "changelist"))
if err != nil {
return nil, err
}
defer cl.Close()
successful := make([]string, 0, len(roles))
for _, role := range roles {
// scope is role
c := changelist.NewTUFChange(
changelist.ActionUpdate,
role,
changelist.TypeWitness,
"",
nil,
)
err = cl.Add(c)
if err != nil {
break
}
successful = append(successful, role)
}
return successful, err
}
func witnessTargets(repo *tuf.Repo, invalid *tuf.Repo, role string) error {
if r, ok := repo.Targets[role]; ok {
// role is already valid, mark for re-signing/updating
r.Dirty = true
return nil
}
if roleObj, err := repo.GetDelegationRole(role); err == nil && invalid != nil {
// A role with a threshold > len(keys) is technically invalid, but we let it build in the builder because
// we want to be able to download the role (which may still have targets on it), add more keys, and then
// witness the role, thus bringing it back to valid. However, if no keys have been added before witnessing,
// then it is still an invalid role, and can't be witnessed because nothing can bring it back to valid.
if roleObj.Threshold > len(roleObj.Keys) {
return data.ErrInvalidRole{
Role: role,
Reason: "role does not specify enough valid signing keys to meet its required threshold",
}
}
if r, ok := invalid.Targets[role]; ok {
// role is recognized but invalid, move to valid data and mark for re-signing
repo.Targets[role] = r
r.Dirty = true
return nil
}
}
// role isn't recognized, even as invalid
return data.ErrInvalidRole{
Role: role,
Reason: "this role is not known",
}
}