Issuer: Remove from_trust_config()

This is not a very useful helper: just use the url at callsite

Signed-off-by: Jussi Kukkonen <[email protected]>

Author: jku

sigstore/_cli.py

@@ -1190,7 +1190,7 @@ def _get_identity(
     if args.oidc_issuer is not None:
         issuer = Issuer(args.oidc_issuer)
     else:
-        issuer = Issuer.from_trust_config(trust_config)
+        issuer = Issuer(trust_config.signing_config.get_oidc_url())
 
     if args.oidc_client_secret is None:
         args.oidc_client_secret = ""  # nosec: B105

sigstore/oidc.py

@@ -32,7 +32,6 @@
 from pydantic import BaseModel, StrictStr
 
 from sigstore._internal import USER_AGENT
-from sigstore._internal.trust import ClientTrustConfig
 from sigstore.errors import Error, NetworkError
 
 # See: https://github.com/sigstore/fulcio/blob/b2186c0/pkg/config/config.go#L182-L201
@@ -269,13 +268,6 @@ def __init__(self, base_url: str) -> None:
         except ValueError as exc:
             raise IssuerError(f"OIDC issuer returned invalid configuration: {exc}")
 
-    @classmethod
-    def from_trust_config(cls, trust_config: ClientTrustConfig) -> Issuer:
-        """
-        Return `Issuer` for given `ClientTrustConfig`.
-        """
-        return cls(trust_config.signing_config.get_oidc_url())
-
     def identity_token(  # nosec: B107
         self,
         client_id: str = "sigstore",