This is a huge commit, it does following things:

1. refactor kubesphere dependency service client creation, we can
disable dependency by config
2. dependencies can be configured by configuration file
3. refactor cmd package using cobra.Command, so we can use hypersphere
to invoke command sepearately. Later we only need to build one image to
contains all kubesphere core components. One command to rule them all!
4. live reloading configuration currently not implemented

pkg/simple/client/ldap/options.go

@@ -0,0 +1,53 @@
+package ldap
+
+import (
+	"github.com/spf13/pflag"
+	"kubesphere.io/kubesphere/pkg/utils/reflectutils"
+)
+
+type LdapOptions struct {
+	Host            string `json:"host,omitempty" yaml:"host,omitempty"`
+	ManagerDN       string `json:"managerDN,omitempty" yaml:"managerDN,omitempty"`
+	ManagerPassword string `json:"managerPassword,omitempty" yaml:"managerPassword,omitempty"`
+	UserSearchBase  string `json:"userSearchBase,omitempty" yaml:"userSearchBase,omitempty"`
+	GroupSearchBase string `json:"groupSearchBase,omitempty" yaml:"groupSearchBase,omitempty"`
+}
+
+// NewLdapOptions return a default option
+// which host field point to nowhere.
+func NewLdapOptions() *LdapOptions {
+	return &LdapOptions{
+		Host:            "",
+		ManagerDN:       "cn=admin,dc=example,dc=org",
+		UserSearchBase:  "ou=Users,dc=example,dc=org",
+		GroupSearchBase: "ou=Groups,dc=example,dc=org",
+	}
+}
+
+func (l *LdapOptions) Validate() []error {
+	errors := []error{}
+
+	return errors
+}
+
+func (l *LdapOptions) ApplyTo(options *LdapOptions) {
+	reflectutils.Override(options, l)
+}
+
+func (l *LdapOptions) AddFlags(fs *pflag.FlagSet) {
+	fs.StringVar(&l.Host, "ldap-host", l.Host, ""+
+		"Ldap service host, if left blank, all of the following options will "+
+		"be ignored and ldap will be disabled.")
+
+	fs.StringVar(&l.ManagerDN, "ldap-manager-dn", l.ManagerDN, ""+
+		"Ldap manager account domain name.")
+
+	fs.StringVar(&l.ManagerPassword, "ldap-manager-password", l.ManagerPassword, ""+
+		"Ldap manager account password.")
+
+	fs.StringVar(&l.UserSearchBase, "ldap-user-search-base", l.UserSearchBase, ""+
+		"Ldap user search base.")
+
+	fs.StringVar(&l.GroupSearchBase, "ldap-group-search-base", l.GroupSearchBase, ""+
+		"Ldap group search base.")
+}