From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001

From: Michael Chang <mchang@suse.com>

Date: Thu, 21 Aug 2014 03:39:11 +0000

Subject: [PATCH] grub2-btrfs-04-grub2-install

---

 grub-core/osdep/linux/getroot.c |  7 +++++++

 grub-core/osdep/unix/config.c   | 17 +++++++++++++++--

 util/config.c                   | 10 ++++++++++

 util/grub-install.c             | 15 +++++++++++++++

 util/grub-mkrelpath.c           |  6 ++++++

 include/grub/emu/config.h       |  1 +

 6 files changed, 54 insertions(+), 2 deletions(-)

diff --git a/grub-core/osdep/linux/getroot.c b/grub-core/osdep/linux/getroot.c

index 001b818fe58..caf9b1ccd3f 100644

--- a/grub-core/osdep/linux/getroot.c

+++ b/grub-core/osdep/linux/getroot.c

@@ -376,6 +376,7 @@ get_btrfs_fs_prefix (const char *mount_path)

   return NULL;

 }

+int use_relative_path_on_btrfs = 0;

 char **

 grub_find_root_devices_from_mountinfo (const char *dir, char **relroot)

@@ -519,6 +520,12 @@ again:

 	{

 	  ret = grub_find_root_devices_from_btrfs (dir);

 	  fs_prefix = get_btrfs_fs_prefix (entries[i].enc_path);

+	  if (use_relative_path_on_btrfs)

+	    {

+	      if (fs_prefix)

+	        free (fs_prefix);

+	      fs_prefix = xstrdup ("/");

+	    }

 	}

       else if (!retry && grub_strcmp (entries[i].fstype, "autofs") == 0)

 	{

diff --git a/grub-core/osdep/unix/config.c b/grub-core/osdep/unix/config.c

index 7d6325138ce..46a881530c0 100644

--- a/grub-core/osdep/unix/config.c

+++ b/grub-core/osdep/unix/config.c

@@ -82,6 +82,19 @@ grub_util_load_config (struct grub_util_config *cfg)

   if (v)

     cfg->grub_distributor = xstrdup (v);

+  v = getenv ("SUSE_BTRFS_SNAPSHOT_BOOTING");

+  if (v)

+    {

+      if (grub_strncmp(v, "true", sizeof ("true") - 1) == 0)

+        {

+          cfg->is_suse_btrfs_snapshot_enabled = 1;

+        }

+      else

+        {

+          cfg->is_suse_btrfs_snapshot_enabled = 0;

+        }

+    }

+

   cfgfile = grub_util_get_config_filename ();

   if (!grub_util_is_regular (cfgfile))

     return;

@@ -105,8 +118,8 @@ grub_util_load_config (struct grub_util_config *cfg)

       *ptr++ = *iptr;

     }

-  strcpy (ptr, "'; printf \"GRUB_ENABLE_CRYPTODISK=%s\\nGRUB_DISTRIBUTOR=%s\\n\" "

-	  "\"$GRUB_ENABLE_CRYPTODISK\" \"$GRUB_DISTRIBUTOR\"");

+  strcpy (ptr, "'; printf \"GRUB_ENABLE_CRYPTODISK=%s\\nGRUB_DISTRIBUTOR=%s\\nSUSE_BTRFS_SNAPSHOT_BOOTING=%s\\n\" "

+	  "\"$GRUB_ENABLE_CRYPTODISK\" \"$GRUB_DISTRIBUTOR\" \"$SUSE_BTRFS_SNAPSHOT_BOOTING\"");

   argv[2] = script;

   argv[3] = '\0';

diff --git a/util/config.c b/util/config.c

index ebcdd8f5e22..f044a880a76 100644

--- a/util/config.c

+++ b/util/config.c

@@ -42,6 +42,16 @@ grub_util_parse_config (FILE *f, struct grub_util_config *cfg, int simple)

 	    cfg->is_cryptodisk_enabled = 1;

 	  continue;

 	}

+      if (grub_strncmp (ptr, "SUSE_BTRFS_SNAPSHOT_BOOTING=",

+			sizeof ("SUSE_BTRFS_SNAPSHOT_BOOTING=") - 1) == 0)

+	{

+	  ptr += sizeof ("SUSE_BTRFS_SNAPSHOT_BOOTING=") - 1;

+	  if (*ptr == '"' || *ptr == '\'')

+	    ptr++;

+	  if (grub_strncmp(ptr, "true", sizeof ("true") - 1) == 0)

+	    cfg->is_suse_btrfs_snapshot_enabled = 1;

+	  continue;

+	}

       if (grub_strncmp (ptr, "GRUB_DISTRIBUTOR=",

 			sizeof ("GRUB_DISTRIBUTOR=") - 1) == 0)

 	{

diff --git a/util/grub-install.c b/util/grub-install.c

index 0fbe7f78c6d..0f66f36d23a 100644

--- a/util/grub-install.c

+++ b/util/grub-install.c

@@ -827,6 +827,8 @@ fill_core_services (const char *core_services)

   free (sysv_plist);

 }

+extern int use_relative_path_on_btrfs;

+

 int

 main (int argc, char *argv[])

 {

@@ -860,6 +862,9 @@ main (int argc, char *argv[])

   grub_util_load_config (&config);

+  if (config.is_suse_btrfs_snapshot_enabled)

+    use_relative_path_on_btrfs = 1;

+

   if (!bootloader_id && config.grub_distributor)

     {

       char *ptr;

@@ -1352,6 +1357,16 @@ main (int argc, char *argv[])

       fprintf (load_cfg_f, "set debug='%s'\n",

 	      debug_image);

     }

+

+  if (config.is_suse_btrfs_snapshot_enabled

+      && grub_strncmp(grub_fs->name, "btrfs", sizeof ("btrfs") - 1) == 0)

+    {

+      if (!load_cfg_f)

+        load_cfg_f = grub_util_fopen (load_cfg, "wb");

+      have_load_cfg = 1;

+      fprintf (load_cfg_f, "set btrfs_relative_path='y'\n");

+    }

+

   char *prefix_drive = NULL;

   char *install_drive = NULL;

diff --git a/util/grub-mkrelpath.c b/util/grub-mkrelpath.c

index 47a241a391b..5db7a9a7d97 100644

--- a/util/grub-mkrelpath.c

+++ b/util/grub-mkrelpath.c

@@ -40,9 +40,12 @@ struct arguments

 };

 static struct argp_option options[] = {

+  {"relative",  'r', 0, 0, "use relative path on btrfs", 0},

   { 0, 0, 0, 0, 0, 0 }

 };

+extern int use_relative_path_on_btrfs;

+

 static error_t

 argp_parser (int key, char *arg, struct argp_state *state)

 {

@@ -52,6 +55,9 @@ argp_parser (int key, char *arg, struct argp_state *state)

   switch (key)

     {

+    case 'r':

+      use_relative_path_on_btrfs = 1;

+      break;

     case ARGP_KEY_ARG:

       if (state->arg_num == 0)

 	arguments->pathname = xstrdup (arg);

diff --git a/include/grub/emu/config.h b/include/grub/emu/config.h

index 875d5896ce1..c9a7e5f4ade 100644

--- a/include/grub/emu/config.h

+++ b/include/grub/emu/config.h

@@ -37,6 +37,7 @@ struct grub_util_config

 {

   int is_cryptodisk_enabled;

   char *grub_distributor;

+  int is_suse_btrfs_snapshot_enabled;

 };

 void