admin: Rework /ostree/deploy to support multiple independent operating systems

The real vision of OSTree is to "multiple versions of multiple
operating systems".  Up until now, it's worked to install gnome-ostree
inside a host distribution, but several things don't work quite right
if you try to do completely different systems.

In the new model, there's the concept of an "osname" which encompasses
a few properties:

1) Its own /var
2) A set of trees deployed in /ostree/deploy/OSNAME/
3) Its own "current" and "previous" links.

Now it no longer really makes sense to boot with "ostree=current".
Instead, you specify e.g. "ostree=gnome/current".

This is an incompatible change to the deployment code - you will need
to run init-os gnome and redeploy.

All "ostree admin" subcommands now take an OSNAME argument.

1 files changed, 105 insertions, 0 deletions

diff --git a/src/ostree/ot-admin-builtin-os-init.c b/src/ostree/ot-admin-builtin-os-init.c
new file mode 100644
index 00000000..3cd38aa8
--- /dev/null
+++ b/src/ostree/ot-admin-builtin-os-init.c
@@ -0,0 +1,105 @@
+/* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*-
+ *
+ * Copyright (C) 2012 Colin Walters <walters@verbum.org>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ *
+ * Author: Colin Walters <walters@verbum.org>
+ */
+
+#include "config.h"
+
+#include "ot-admin-builtins.h"
+#include "ot-admin-functions.h"
+#include "otutil.h"
+
+#include <glib/gi18n.h>
+
+static GOptionEntry options[] = {
+  { NULL }
+};
+
+gboolean
+ot_admin_builtin_os_init (int argc, char **argv, GFile *ostree_dir, GError **error)
+{
+  GOptionContext *context;
+  gboolean ret = FALSE;
+  const char *osname = NULL;
+  ot_lobj GFile *deploy_dir = NULL;
+  ot_lobj GFile *dir = NULL;
+  __attribute__((unused)) GCancellable *cancellable = NULL;
+
+  context = g_option_context_new ("OSNAME - Initialize empty state for given operating system");
+  g_option_context_add_main_entries (context, options, NULL);
+
+  if (!g_option_context_parse (context, &argc, &argv, error))
+    goto out;
+
+  if (!ot_admin_ensure_initialized (ostree_dir, cancellable, error))
+    goto out;
+
+  if (argc < 2)
+    {
+      ot_util_usage_error (context, "OSNAME must be specified", error);
+      goto out;
+    }
+
+  osname = argv[1];
+
+  deploy_dir = ot_gfile_get_child_build_path (ostree_dir, "deploy", osname, NULL);
+
+  /* Ensure core subdirectories of /var exist, since we need them for
+   * dracut generation, and the host will want them too.
+   */
+  g_clear_object (&dir);
+  dir = ot_gfile_get_child_build_path (deploy_dir, "var", "log", NULL);
+  if (!gs_file_ensure_directory (dir, TRUE, cancellable, error))
+    goto out;
+
+  g_clear_object (&dir);
+  dir = ot_gfile_get_child_build_path (deploy_dir, "var", "tmp", NULL);
+  if (!gs_file_ensure_directory (dir, TRUE, cancellable, error))
+    goto out;
+  if (chmod (gs_file_get_path_cached (dir), 01777) < 0)
+    {
+      ot_util_set_error_from_errno (error, errno);
+      goto out;
+    }
+
+  g_clear_object (&dir);
+  dir = ot_gfile_get_child_build_path (deploy_dir, "var", "lib", NULL);
+  if (!gs_file_ensure_directory (dir, TRUE, cancellable, error))
+    goto out;
+
+  g_clear_object (&dir);
+  dir = ot_gfile_get_child_build_path (deploy_dir, "var", "run", NULL);
+  if (!g_file_test (gs_file_get_path_cached (dir), G_FILE_TEST_IS_SYMLINK))
+    {
+      if (symlink ("../run", gs_file_get_path_cached (dir)) < 0)
+        {
+          ot_util_set_error_from_errno (error, errno);
+          goto out;
+        }
+    }
+
+  g_print ("%s initialized as OSTree root\n", gs_file_get_path_cached (deploy_dir));
+
+  ret = TRUE;
+ out:
+  if (context)
+    g_option_context_free (context);
+  return ret;
+}