libostree: Move a lot more sysroot API here

OstreeBootloader is temporarily public API.

src/libostree/ostree-bootloader-uboot.c

@@ -0,0 +1,180 @@
+/* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*-
+ *
+ * Copyright (C) 2013 Collabora Ltd
+ *
+ * Based on ot-bootloader-syslinux.c by Colin Walters <walters@verbum.org>
+ *
+ * This program 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 licence 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: Javier Martinez Canillas <javier.martinez@collabora.co.uk>
+ */
+
+#include "config.h"
+
+#include "ostree-sysroot-private.h"
+#include "ostree-bootloader-uboot.h"
+#include "otutil.h"
+#include "libgsystem.h"
+
+#include <string.h>
+
+struct _OstreeBootloaderUboot
+{
+  GObject       parent_instance;
+
+  OstreeSysroot  *sysroot;
+  GFile          *config_path;
+};
+
+typedef GObjectClass OstreeBootloaderUbootClass;
+
+static void ostree_bootloader_uboot_bootloader_iface_init (OstreeBootloaderInterface *iface);
+G_DEFINE_TYPE_WITH_CODE (OstreeBootloaderUboot, ostree_bootloader_uboot, G_TYPE_OBJECT,
+                         G_IMPLEMENT_INTERFACE (OSTREE_TYPE_BOOTLOADER, ostree_bootloader_uboot_bootloader_iface_init));
+
+static gboolean
+ostree_bootloader_uboot_query (OstreeBootloader *bootloader)
+{
+  OstreeBootloaderUboot *self = OSTREE_BOOTLOADER_UBOOT (bootloader);
+
+  return g_file_query_file_type (self->config_path, G_FILE_QUERY_INFO_NOFOLLOW_SYMLINKS, NULL) == G_FILE_TYPE_SYMBOLIC_LINK;
+}
+
+static const char *
+ostree_bootloader_uboot_get_name (OstreeBootloader *bootloader)
+{
+  return "U-Boot";
+}
+
+static gboolean
+create_config_from_boot_loader_entries (OstreeBootloaderUboot     *self,
+                                        int                    bootversion,
+                                        GPtrArray             *new_lines,
+                                        GCancellable          *cancellable,
+                                        GError               **error)
+{
+  gs_unref_ptrarray GPtrArray *boot_loader_configs = NULL;
+  OstreeBootconfigParser *config;
+  const char *val;
+
+  if (!_ostree_sysroot_read_boot_loader_configs (self->sysroot, bootversion, &boot_loader_configs,
+                                                 cancellable, error))
+    return FALSE;
+
+  /* U-Boot doesn't support a menu so just pick the first one since the list is ordered */
+  config = boot_loader_configs->pdata[0];
+
+  val = ostree_bootconfig_parser_get (config, "linux");
+  if (!val)
+    {
+      g_set_error (error, G_IO_ERROR, G_IO_ERROR_FAILED,
+                   "No \"linux\" key in bootloader config");
+      return FALSE;
+    }
+  g_ptr_array_add (new_lines, g_strdup_printf ("kernel_image=%s", val));
+
+  val = ostree_bootconfig_parser_get (config, "initrd");
+  if (val)
+    g_ptr_array_add (new_lines, g_strdup_printf ("ramdisk_image=%s", val));
+
+  val = ostree_bootconfig_parser_get (config, "options");
+  if (val)
+    g_ptr_array_add (new_lines, g_strdup_printf ("bootargs=%s", val));
+
+  return TRUE;
+}
+
+static gboolean
+ostree_bootloader_uboot_write_config (OstreeBootloader          *bootloader,
+                                  int                    bootversion,
+                                  GCancellable          *cancellable,
+                                  GError               **error)
+{
+  OstreeBootloaderUboot *self = OSTREE_BOOTLOADER_UBOOT (bootloader);
+  gs_unref_object GFile *new_config_path = NULL;
+  gs_free char *config_contents = NULL;
+  gs_free char *new_config_contents = NULL;
+  gs_unref_ptrarray GPtrArray *new_lines = NULL;
+
+  /* This should follow the symbolic link to the current bootversion. */
+  config_contents = gs_file_load_contents_utf8 (self->config_path, cancellable, error);
+  if (!config_contents)
+    return FALSE;
+
+  new_config_path = ot_gfile_resolve_path_printf (self->sysroot->path, "boot/loader.%d/uEnv.txt",
+                                                      bootversion);
+
+  new_lines = g_ptr_array_new_with_free_func (g_free);
+
+  if (!create_config_from_boot_loader_entries (self, bootversion, new_lines,
+                                               cancellable, error))
+    return FALSE;
+
+  new_config_contents = _ostree_sysroot_join_lines (new_lines);
+
+  if (strcmp (new_config_contents, config_contents) != 0)
+    {
+      if (!g_file_replace_contents (new_config_path, new_config_contents,
+                                    strlen (new_config_contents),
+                                    NULL, FALSE, G_FILE_CREATE_NONE,
+                                    NULL, cancellable, error))
+        return FALSE;
+      g_print ("Saved new version of %s\n", gs_file_get_path_cached (self->config_path));
+    }
+
+  return TRUE;
+}
+
+static void
+ostree_bootloader_uboot_finalize (GObject *object)
+{
+  OstreeBootloaderUboot *self = OSTREE_BOOTLOADER_UBOOT (object);
+
+  g_clear_object (&self->sysroot);
+  g_clear_object (&self->config_path);
+
+  G_OBJECT_CLASS (ostree_bootloader_uboot_parent_class)->finalize (object);
+}
+
+void
+ostree_bootloader_uboot_init (OstreeBootloaderUboot *self)
+{
+}
+
+static void
+ostree_bootloader_uboot_bootloader_iface_init (OstreeBootloaderInterface *iface)
+{
+  iface->query = ostree_bootloader_uboot_query;
+  iface->get_name = ostree_bootloader_uboot_get_name;
+  iface->write_config = ostree_bootloader_uboot_write_config;
+}
+
+void
+ostree_bootloader_uboot_class_init (OstreeBootloaderUbootClass *class)
+{
+  GObjectClass *object_class = G_OBJECT_CLASS (class);
+
+  object_class->finalize = ostree_bootloader_uboot_finalize;
+}
+
+OstreeBootloaderUboot *
+ostree_bootloader_uboot_new (OstreeSysroot *sysroot)
+{
+  OstreeBootloaderUboot *self = g_object_new (OSTREE_TYPE_BOOTLOADER_UBOOT, NULL);
+  self->sysroot = g_object_ref (sysroot);
+  self->config_path = g_file_resolve_relative_path (self->sysroot->path, "boot/uEnv.txt");
+  return self;
+}