Blame SOURCES/0212-blscfg-remove-logic-to-read-the-grubenv-file-and-set.patch

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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Javier Martinez Canillas <javierm@redhat.com>
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Date: Sat, 28 Jul 2018 23:57:15 +0200
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Subject: [PATCH] blscfg: remove logic to read the grubenv file and set the
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 blsdir variable
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The BLS grub2 support has a blsdir environment variable that can be set by
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users to override the BLS fragment default path.
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Currently the BLS parsing code reads the grubenv file and sets the blsdir
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variable, but it shouldn't be the responsability of the blscfg module to
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do this and instead just use it if the variable has been set (either from
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the grub.cfg file or the grub shell).
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This makes the find_entry() function much simpler and consistent for EFI,
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BIOS and grub-emu. It also fixes a bug that caused having menu entries to
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be repeated for each sub-directory that existed under the /EFI directory.
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So for example having three different operating systems sharing the ESP,
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would lead to the boot menu entries being repeated three times for grub.
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Signed-off-by: Javier Martinez Canillas <javierm@redhat.com>
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---
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 grub-core/commands/blscfg.c | 179 ++++----------------------------------------
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 1 file changed, 16 insertions(+), 163 deletions(-)
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diff --git a/grub-core/commands/blscfg.c b/grub-core/commands/blscfg.c
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index 69bfb5db2..bdb1c5a95 100644
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--- a/grub-core/commands/blscfg.c
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+++ b/grub-core/commands/blscfg.c
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@@ -45,13 +45,6 @@ GRUB_MOD_LICENSE ("GPLv3+");
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 #define GRUB_BOOT_DEVICE "($root)"
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 #endif
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-enum
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-  {
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-    PLATFORM_EFI,
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-    PLATFORM_EMU,
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-    PLATFORM_BIOS,
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-  };
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-
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 #define grub_free(x) ({grub_dprintf("blscfg", "%s freeing %p\n", __func__, x); grub_free(x); })
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 struct keyval
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@@ -666,137 +659,37 @@ finish:
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 }
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 struct find_entry_info {
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+	const char *devid;
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 	grub_device_t dev;
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 	grub_fs_t fs;
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 	int platform;
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 };
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 /*
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- * filename: if the directory is /EFI/something/ , filename is "something"
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- * info: unused
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- * data: the filesystem object the file is on.
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+ * info: the filesystem object the file is on.
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  */
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-static int find_entry (const char *filename,
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-		       const struct grub_dirhook_info *dirhook_info UNUSED,
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-		       void *data)
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+static int find_entry (struct find_entry_info *info)
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 {
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-  struct find_entry_info *info = (struct find_entry_info *)data;
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   struct read_entry_info read_entry_info;
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-  grub_file_t f = NULL;
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-  char *grubenv_path = NULL;
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-  grub_envblk_t env = NULL;
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-  const char *default_blsdir = NULL;
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   grub_fs_t blsdir_fs = NULL;
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   grub_device_t blsdir_dev = NULL;
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   const char *blsdir = NULL;
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-  char *saved_env_buf = NULL;
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   bool use_version = true;
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   int fallback = 0;
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   int r = 0;
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-  const char *devid = grub_env_get ("boot");
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-
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-  grub_dprintf("blscfg", "%s got here\n", __func__);
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-  if (filename && (!grub_strcmp (filename, ".") ||
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-		   !grub_strcmp (filename, "..")))
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-    return 0;
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-
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-  if (info->platform == PLATFORM_EFI && !grub_strcasecmp (filename, "boot"))
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-    return 0;
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-
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-  saved_env_buf = grub_malloc (512);
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-
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-  // set a default blsdir
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-  if (info->platform == PLATFORM_EMU)
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-    default_blsdir = GRUB_BOOT_DEVICE GRUB_BLS_CONFIG_PATH;
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-  else
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-    default_blsdir = GRUB_BLS_CONFIG_PATH;
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-
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-  grub_env_set ("blsdir", default_blsdir);
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-  grub_dprintf ("blscfg", "default_blsdir: \"%s\"\n", default_blsdir);
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-
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-  /*
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-   * try to load a grubenv from /EFI/wherever/grubenv
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-   */
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-  if (info->platform == PLATFORM_EFI)
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-    grubenv_path = grub_xasprintf ("(%s)/EFI/%s/grubenv", devid, filename);
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-  else
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-    grubenv_path = grub_xasprintf ("(%s)/grub2/grubenv", devid);
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-
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-  grub_dprintf ("blscfg", "looking for \"%s\"\n", grubenv_path);
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-  f = grub_file_open (grubenv_path);
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-
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-  grub_dprintf ("blscfg", "%s it\n", f ? "found" : "did not find");
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-  grub_free (grubenv_path);
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-  if (f)
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-    {
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-      grub_off_t sz;
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-
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-      grub_dprintf ("blscfg", "getting size\n");
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-      sz = grub_file_size (f);
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-      if (sz == GRUB_FILE_SIZE_UNKNOWN || sz > 1024*1024)
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-	goto finish;
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-
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-      grub_dprintf ("blscfg", "reading env\n");
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-      env = read_envblk_file (f);
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-      if (!env)
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-	goto finish;
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-      grub_dprintf ("blscfg", "read env file\n");
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-
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-      grub_memset (saved_env_buf, '#', 512);
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-      grub_memcpy (saved_env_buf, GRUB_ENVBLK_SIGNATURE,
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-		   sizeof (GRUB_ENVBLK_SIGNATURE));
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-      grub_dprintf ("blscfg", "saving env\n");
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-      saved_env = grub_envblk_open (saved_env_buf, 512);
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-      if (!saved_env)
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-	goto finish;
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-
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-      // save everything listed in "env" with values from our existing grub env
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-      grub_envblk_iterate (env, NULL, save_var);
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-      // set everything from our loaded grubenv into the real grub env
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-      grub_envblk_iterate (env, NULL, set_var);
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-    }
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-  else
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-    {
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-      grub_err_t e;
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-      grub_dprintf ("blscfg", "no such file\n");
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-      do
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-	{
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-	  e = grub_error_pop();
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-	} while (e);
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-
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-    }
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   blsdir = grub_env_get ("blsdir");
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   if (!blsdir)
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-    goto finish;
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+    blsdir = GRUB_BLS_CONFIG_PATH;
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-  grub_dprintf ("blscfg", "blsdir: \"%s\"\n", blsdir);
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-  blsdir = grub_strdup (blsdir);
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-
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-  if (!blsdir)
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-    goto finish;
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-
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-  grub_dprintf ("blscfg", "blsdir: \"%s\"\n", blsdir);
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-  if (info->platform == PLATFORM_EFI) {
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-    read_entry_info.devid = grub_env_get ("root");
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-    if (!read_entry_info.devid)
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-      goto finish;
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-
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-    blsdir_dev = grub_device_open (read_entry_info.devid);
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-    if (!blsdir_dev)
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-      goto finish;
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-
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-    blsdir_fs = grub_fs_probe (blsdir_dev);
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-    if (!blsdir_fs)
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-      goto finish;
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-
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-  } else {
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-    read_entry_info.devid = devid;
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-    blsdir_dev = info->dev;
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-    blsdir_fs = info->fs;
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-  }
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   read_entry_info.dirname = blsdir;
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+  grub_dprintf ("blscfg", "scanning blsdir: %s\n", GRUB_BLS_CONFIG_PATH);
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+
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+  blsdir_dev = info->dev;
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+  blsdir_fs = info->fs;
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+  read_entry_info.devid = info->devid;
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+
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 read_fallback:
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   r = blsdir_fs->dir (blsdir_dev, read_entry_info.dirname, read_entry,
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 		      &read_entry_info);
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@@ -809,7 +702,7 @@ read_fallback:
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 	} while (e);
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   }
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-  if (!nentries && !fallback && info->platform != PLATFORM_EMU) {
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+  if (!nentries && !fallback) {
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     read_entry_info.dirname = "/boot" GRUB_BLS_CONFIG_PATH;
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     grub_dprintf ("blscfg", "Entries weren't found in %s, fallback to %s\n",
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 		  blsdir, read_entry_info.dirname);
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@@ -832,41 +725,12 @@ read_fallback:
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   for (r = 0; r < nentries; r++)
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       bls_free_entry (entries[r]);
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-finish:
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-  if (info->platform == PLATFORM_EFI && blsdir_dev)
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-    grub_device_close (blsdir_dev);
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   nentries = 0;
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   grub_free (entries);
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   entries = NULL;
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-  grub_free ((char *)blsdir);
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-
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-  grub_env_unset ("blsdir");
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-
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-  if (saved_env)
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-    {
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-      // remove everything from the real environment that's defined in env
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-      grub_envblk_iterate (env, NULL, unset_var);
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-
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-      // re-set the things from our original environment
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-      grub_envblk_iterate (saved_env, NULL, set_var);
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-      grub_envblk_close (saved_env);
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-      saved_env = NULL;
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-    }
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-  else if (saved_env_buf)
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-    {
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-      // if we have a saved environment, grub_envblk_close() freed this.
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-      grub_free (saved_env_buf);
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-    }
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-
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-  if (env)
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-    grub_envblk_close (env);
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-
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-  if (f)
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-    grub_file_close (f);
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-
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   return 0;
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 }
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@@ -883,7 +747,6 @@ grub_cmd_blscfg (grub_extcmd_context_t ctxt UNUSED,
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     {
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       .dev = NULL,
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       .fs = NULL,
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-      .platform = PLATFORM_BIOS,
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     };
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@@ -891,13 +754,14 @@ grub_cmd_blscfg (grub_extcmd_context_t ctxt UNUSED,
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 #ifdef GRUB_MACHINE_EMU
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   devid = "host";
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-  grub_env_set ("boot", devid);
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+#elif defined(GRUB_MACHINE_EFI)
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+  devid = grub_env_get ("root");
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 #else
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   devid = grub_env_get ("boot");
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+#endif
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   if (!devid)
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     return grub_error (GRUB_ERR_FILE_NOT_FOUND,
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 		       N_("variable `%s' isn't set"), "boot");
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-#endif
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   grub_dprintf ("blscfg", "opening %s\n", devid);
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   dev = grub_device_open (devid);
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@@ -912,21 +776,10 @@ grub_cmd_blscfg (grub_extcmd_context_t ctxt UNUSED,
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       goto finish;
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     }
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+  info.devid = devid;
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   info.dev = dev;
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   info.fs = fs;
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-#ifdef GRUB_MACHINE_EFI
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-  info.platform = PLATFORM_EFI;
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-  grub_dprintf ("blscfg", "scanning /EFI/\n");
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-  r = fs->dir (dev, "/EFI/", find_entry, &info;;
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-#elif defined(GRUB_MACHINE_EMU)
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-  info.platform = PLATFORM_EMU;
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-  grub_dprintf ("blscfg", "scanning %s%s\n", GRUB_BOOT_DEVICE,
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-		GRUB_BLS_CONFIG_PATH);
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-  find_entry(NULL, NULL, &info;;
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-#else
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-  grub_dprintf ("blscfg", "scanning %s\n", GRUB_BLS_CONFIG_PATH);
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-  find_entry(NULL, NULL, &info;;
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-#endif
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+  find_entry(&info;;
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 finish:
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   if (dev)