timecraft: add describe command

format/timecraft.go

@@ -27,13 +27,20 @@ func SHA256(b []byte) Hash {
  }
 }
 
-func ParseHash(s string) (h Hash, err error) {
- var ok bool
- h.Algorithm, h.Digest, ok = strings.Cut(s, ":")
+func ParseHash(s string) Hash {
+ algorithm, digest, ok := strings.Cut(s, ":")
  if !ok {
- err = fmt.Errorf("malformed hash: %s", s)
+ algorithm, digest = "sha256", s
  }
- return h, err
+ return Hash{Algorithm: algorithm, Digest: digest}
+}
+
+func (h Hash) Short() string {
+ s := h.Digest
+ if len(s) > 12 {
+ s = s[:12]
+ }
+ return s
 }
 
 func (h Hash) String() string {
@@ -123,6 +130,7 @@ func (m *Module) UnmarshalResource(b []byte) error {
 }
 
 type Runtime struct {
+ Runtime string `json:"runtime" yaml:"runtime"`
  Version string `json:"version" yaml:"version"`
 }