Add logout command

cmd/policy/logout.go

@@ -0,0 +1,21 @@
+package main
+
+type LogoutCmd struct {
+	Server string `name:"server" short:"s" help:"Server to logout from." default:"opcr.io"`
+}
+
+func (c *LogoutCmd) Run(g *Globals) error {
+	g.App.UI.Normal().
+		WithStringValue("server", c.Server).
+		Msg("Logging out.")
+
+	err := g.App.RemoveServerCreds(c.Server)
+	if err != nil {
+		return err
+	}
+
+	g.App.UI.Normal().Msg("OK.")
+
+	<-g.App.Context.Done()
+	return nil
+}

cmd/policy/main.go

@@ -44,6 +44,7 @@ var PolicyCLI struct {
 	Push    PushCmd    `cmd:"" help:"Push policies to a registry."`
 	Pull    PullCmd    `cmd:"" help:"Pull policies from a registry."`
 	Login   LoginCmd   `cmd:"" help:"Login to a registry."`
+	Logout  LogoutCmd  `cmd:"" help:"Logout from a registry."`
 	Save    SaveCmd    `cmd:"" help:"Save a policy to a local bundle tarball."`
 	Tag     TagCmd     `cmd:"" help:"Create a new tag for an existing policy."`
 	Rm      RmCmd      `cmd:"" help:"Removes a policy from the local registry."`

pkg/app/policy_cli.go

@@ -38,3 +38,23 @@ func (c *PolicyApp) SaveServerCreds(server string, creds config.ServerCredential
 
 	return nil
 }
+
+func (c *PolicyApp) RemoveServerCreds(server string) error {
+	defer c.Cancel()
+	if server == "" {
+		server = c.Configuration.DefaultDomain
+	}
+
+	if c.Configuration.Servers == nil {
+		c.Configuration.Servers = map[string]config.ServerCredentials{}
+	}
+
+	c.Configuration.Servers[server] = config.ServerCredentials{}
+
+	err := c.Configuration.SaveCreds()
+	if err != nil {
+		return errors.Wrap(err, "failed to save server credentials")
+	}
+
+	return nil
+}