[ostree] ostree admin instutil: make --help work for subcommands

[Owen Taylor <otaylor src gnome org>]

commit c9018c785ca7296bf78ebabce5e10ef3094eee66
Author: Owen W. Taylor <otaylor fishsoup net>
Date:   Wed Sep 24 09:23:56 2014 -0400

    ostree admin instutil: make --help work for subcommands
    
    Even though the subcommands don't take arguments, use a GOptionContext
    so that --help works as expected.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=737194

 ...admin-instutil-builtin-selinux-ensure-labeled.c |   14 ++++++++++++++
 src/ostree/ot-admin-instutil-builtin-set-kargs.c   |   14 ++++++++++++++
 2 files changed, 28 insertions(+), 0 deletions(-)
---
diff --git a/src/ostree/ot-admin-instutil-builtin-selinux-ensure-labeled.c 
b/src/ostree/ot-admin-instutil-builtin-selinux-ensure-labeled.c
index 2ffe098..8bd0c8a 100644
--- a/src/ostree/ot-admin-instutil-builtin-selinux-ensure-labeled.c
+++ b/src/ostree/ot-admin-instutil-builtin-selinux-ensure-labeled.c
@@ -173,6 +173,10 @@ selinux_relabel_dir (OstreeSePolicy                *sepolicy,
   return ret;
 }
 
+static GOptionEntry options[] = {
+  { NULL }
+};
+
 gboolean
 ot_admin_instutil_builtin_selinux_ensure_labeled (int argc, char **argv, OstreeSysroot *sysroot, 
GCancellable *cancellable, GError **error)
 {
@@ -183,8 +187,16 @@ ot_admin_instutil_builtin_selinux_ensure_labeled (int argc, char **argv, OstreeS
   gs_unref_object OstreeSePolicy *sepolicy = NULL;
   gs_unref_ptrarray GPtrArray *deployments = NULL;
   OstreeDeployment *first_deployment;
+  GOptionContext *context = NULL;
   gs_unref_object GFile *deployment_path = NULL;
 
+  context = g_option_context_new ("[SUBPATH PREFIX] - relabel all or part of a deployment");
+
+  g_option_context_add_main_entries (context, options, NULL);
+
+  if (!g_option_context_parse (context, &argc, &argv, error))
+    goto out;
+
   if (!ostree_sysroot_load (sysroot, cancellable, error))
     goto out;
 
@@ -227,5 +239,7 @@ ot_admin_instutil_builtin_selinux_ensure_labeled (int argc, char **argv, OstreeS
 
   ret = TRUE;
  out:
+  if (context)
+    g_option_context_free (context);
   return ret;
 }
diff --git a/src/ostree/ot-admin-instutil-builtin-set-kargs.c 
b/src/ostree/ot-admin-instutil-builtin-set-kargs.c
index 5ca4021..6264a04 100644
--- a/src/ostree/ot-admin-instutil-builtin-set-kargs.c
+++ b/src/ostree/ot-admin-instutil-builtin-set-kargs.c
@@ -27,6 +27,10 @@
 
 #include "otutil.h"
 
+static GOptionEntry options[] = {
+  { NULL }
+};
+
 gboolean
 ot_admin_instutil_builtin_set_kargs (int argc, char **argv, OstreeSysroot *sysroot, GCancellable 
*cancellable, GError **error)
 {
@@ -34,8 +38,16 @@ ot_admin_instutil_builtin_set_kargs (int argc, char **argv, OstreeSysroot *sysro
   guint i;
   gs_unref_ptrarray GPtrArray *deployments = NULL;
   OstreeDeployment *first_deployment = NULL;
+  GOptionContext *context = NULL;
   gs_unref_ptrarray GPtrArray *new_kargs = NULL;
 
+  context = g_option_context_new ("ARGS - set new kernel command line arguments");
+
+  g_option_context_add_main_entries (context, options, NULL);
+
+  if (!g_option_context_parse (context, &argc, &argv, error))
+    goto out;
+
   if (!ostree_sysroot_load (sysroot, cancellable, error))
     goto out;
 
@@ -60,5 +72,7 @@ ot_admin_instutil_builtin_set_kargs (int argc, char **argv, OstreeSysroot *sysro
 
   ret = TRUE;
  out:
+  if (context)
+    g_option_context_free (context);
   return ret;
 }