Don't filter out registries to logout from with config file contents

Previously, if a registry AuthInfo was not present in the CLI config file, docker logout could not be used
to ask the credential helper to forget about it. It causes problem for people working with
multiple alternative config files, and it causes problems for cases like Docker Desktop w/ WSL 2, as
it uses the same win32 credential helper as the Windows CLI, but a different config file, leading to
bugs where I cannot logout from a registry from wsl2 if I logged in from Windows and vice-versa.

Signed-off-by: Simon Ferquel <simon.ferquel@docker.com>

cli/command/registry/logout.go

@@ -39,36 +39,29 @@ func runLogout(dockerCli command.Cli, serverAddress string) error {
 	}
 
 	var (
-		loggedIn        bool
-		regsToLogout    []string
+		regsToLogout    = []string{serverAddress}
 		hostnameAddress = serverAddress
-		regsToTry       = []string{serverAddress}
 	)
 	if !isDefaultRegistry {
 		hostnameAddress = registry.ConvertToHostname(serverAddress)
 		// the tries below are kept for backward compatibility where a user could have
 		// saved the registry in one of the following format.
-		regsToTry = append(regsToTry, hostnameAddress, "http://"+hostnameAddress, "https://"+hostnameAddress)
-	}
-
-	// check if we're logged in based on the records in the config file
-	// which means it couldn't have user/pass cause they may be in the creds store
-	for _, s := range regsToTry {
-		if _, ok := dockerCli.ConfigFile().AuthConfigs[s]; ok {
-			loggedIn = true
-			regsToLogout = append(regsToLogout, s)
-		}
-	}
-
-	if !loggedIn {
-		fmt.Fprintf(dockerCli.Out(), "Not logged in to %s\n", hostnameAddress)
-		return nil
+		regsToLogout = append(regsToLogout, hostnameAddress, "http://"+hostnameAddress, "https://"+hostnameAddress)
 	}
 
 	fmt.Fprintf(dockerCli.Out(), "Removing login credentials for %s\n", hostnameAddress)
+	errs := make(map[string]error)
 	for _, r := range regsToLogout {
 		if err := dockerCli.ConfigFile().GetCredentialsStore(r).Erase(r); err != nil {
-			fmt.Fprintf(dockerCli.Err(), "WARNING: could not erase credentials: %v\n", err)
+			errs[r] = err
+		}
+	}
+
+	// if at least one removal succeeded, report success. Otherwise report errors
+	if len(errs) == len(regsToLogout) {
+		fmt.Fprintln(dockerCli.Err(), "WARNING: could not erase credentials:")
+		for k, v := range errs {
+			fmt.Fprintf(dockerCli.Err(), "%s: %s\n", k, v)
 		}
 	}