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-rw-r--r--grub-core/commands/search.c337
1 files changed, 337 insertions, 0 deletions
diff --git a/grub-core/commands/search.c b/grub-core/commands/search.c
new file mode 100644
index 0000000..ed090b3
--- /dev/null
+++ b/grub-core/commands/search.c
@@ -0,0 +1,337 @@
+/* search.c - search devices based on a file or a filesystem label */
+/*
+ * GRUB -- GRand Unified Bootloader
+ * Copyright (C) 2005,2007,2008,2009 Free Software Foundation, Inc.
+ *
+ * GRUB is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * GRUB 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with GRUB. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <grub/types.h>
+#include <grub/misc.h>
+#include <grub/mm.h>
+#include <grub/err.h>
+#include <grub/dl.h>
+#include <grub/device.h>
+#include <grub/file.h>
+#include <grub/env.h>
+#include <grub/command.h>
+#include <grub/search.h>
+#include <grub/i18n.h>
+#include <grub/disk.h>
+#include <grub/partition.h>
+
+GRUB_MOD_LICENSE ("GPLv3+");
+
+struct cache_entry
+{
+ struct cache_entry *next;
+ char *key;
+ char *value;
+};
+
+static struct cache_entry *cache;
+
+/* Context for FUNC_NAME. */
+struct search_ctx
+{
+ const char *key;
+ const char *var;
+ int no_floppy;
+ char **hints;
+ unsigned nhints;
+ int count;
+ int is_cache;
+};
+
+/* Helper for FUNC_NAME. */
+static int
+iterate_device (const char *name, void *data)
+{
+ struct search_ctx *ctx = data;
+ int found = 0;
+
+ /* Skip floppy drives when requested. */
+ if (ctx->no_floppy &&
+ name[0] == 'f' && name[1] == 'd' && name[2] >= '0' && name[2] <= '9')
+ return 1;
+
+#ifdef DO_SEARCH_FS_UUID
+#define compare_fn grub_strcasecmp
+#else
+#define compare_fn grub_strcmp
+#endif
+
+#ifdef DO_SEARCH_FILE
+ {
+ char *buf;
+ grub_file_t file;
+
+ buf = grub_xasprintf ("(%s)%s", name, ctx->key);
+ if (! buf)
+ return 1;
+
+ file = grub_file_open (buf, GRUB_FILE_TYPE_FS_SEARCH
+ | GRUB_FILE_TYPE_NO_DECOMPRESS);
+ if (file)
+ {
+ found = 1;
+ grub_file_close (file);
+ }
+ grub_free (buf);
+ }
+#else
+ {
+ /* SEARCH_FS_UUID or SEARCH_LABEL */
+ grub_device_t dev;
+ grub_fs_t fs;
+ char *quid;
+
+ dev = grub_device_open (name);
+ if (dev)
+ {
+ fs = grub_fs_probe (dev);
+
+#ifdef DO_SEARCH_FS_UUID
+#define read_fn fs_uuid
+#else
+#define read_fn fs_label
+#endif
+
+ if (fs && fs->read_fn)
+ {
+ fs->read_fn (dev, &quid);
+
+ if (grub_errno == GRUB_ERR_NONE && quid)
+ {
+ if (compare_fn (quid, ctx->key) == 0)
+ found = 1;
+
+ grub_free (quid);
+ }
+ }
+
+ grub_device_close (dev);
+ }
+ }
+#endif
+
+ if (!ctx->is_cache && found && ctx->count == 0)
+ {
+ struct cache_entry *cache_ent;
+ cache_ent = grub_malloc (sizeof (*cache_ent));
+ if (cache_ent)
+ {
+ cache_ent->key = grub_strdup (ctx->key);
+ cache_ent->value = grub_strdup (name);
+ if (cache_ent->value && cache_ent->key)
+ {
+ cache_ent->next = cache;
+ cache = cache_ent;
+ }
+ else
+ {
+ grub_free (cache_ent->value);
+ grub_free (cache_ent->key);
+ grub_free (cache_ent);
+ grub_errno = GRUB_ERR_NONE;
+ }
+ }
+ else
+ grub_errno = GRUB_ERR_NONE;
+ }
+
+ if (found)
+ {
+ ctx->count++;
+ if (ctx->var)
+ grub_env_set (ctx->var, name);
+ else
+ grub_printf (" %s", name);
+ }
+
+ grub_errno = GRUB_ERR_NONE;
+ return (found && ctx->var);
+}
+
+/* Helper for FUNC_NAME. */
+static int
+part_hook (grub_disk_t disk, const grub_partition_t partition, void *data)
+{
+ struct search_ctx *ctx = data;
+ char *partition_name, *devname;
+ int ret;
+
+ partition_name = grub_partition_get_name (partition);
+ if (! partition_name)
+ return 1;
+
+ devname = grub_xasprintf ("%s,%s", disk->name, partition_name);
+ grub_free (partition_name);
+ if (!devname)
+ return 1;
+ ret = iterate_device (devname, ctx);
+ grub_free (devname);
+
+ return ret;
+}
+
+/* Helper for FUNC_NAME. */
+static void
+try (struct search_ctx *ctx)
+{
+ unsigned i;
+ struct cache_entry **prev;
+ struct cache_entry *cache_ent;
+
+ for (prev = &cache, cache_ent = *prev; cache_ent;
+ prev = &cache_ent->next, cache_ent = *prev)
+ if (compare_fn (cache_ent->key, ctx->key) == 0)
+ break;
+ if (cache_ent)
+ {
+ ctx->is_cache = 1;
+ if (iterate_device (cache_ent->value, ctx))
+ {
+ ctx->is_cache = 0;
+ return;
+ }
+ ctx->is_cache = 0;
+ /* Cache entry was outdated. Remove it. */
+ if (!ctx->count)
+ {
+ *prev = cache_ent->next;
+ grub_free (cache_ent->key);
+ grub_free (cache_ent->value);
+ grub_free (cache_ent);
+ }
+ }
+
+ for (i = 0; i < ctx->nhints; i++)
+ {
+ char *end;
+ if (!ctx->hints[i][0])
+ continue;
+ end = ctx->hints[i] + grub_strlen (ctx->hints[i]) - 1;
+ if (*end == ',')
+ *end = 0;
+ if (iterate_device (ctx->hints[i], ctx))
+ {
+ if (!*end)
+ *end = ',';
+ return;
+ }
+ if (!*end)
+ {
+ grub_device_t dev;
+ int ret;
+ dev = grub_device_open (ctx->hints[i]);
+ if (!dev)
+ {
+ if (!*end)
+ *end = ',';
+ continue;
+ }
+ if (!dev->disk)
+ {
+ grub_device_close (dev);
+ if (!*end)
+ *end = ',';
+ continue;
+ }
+ ret = grub_partition_iterate (dev->disk, part_hook, ctx);
+ if (!*end)
+ *end = ',';
+ grub_device_close (dev);
+ if (ret)
+ return;
+ }
+ }
+ grub_device_iterate (iterate_device, ctx);
+}
+
+void
+FUNC_NAME (const char *key, const char *var, int no_floppy,
+ char **hints, unsigned nhints)
+{
+ struct search_ctx ctx = {
+ .key = key,
+ .var = var,
+ .no_floppy = no_floppy,
+ .hints = hints,
+ .nhints = nhints,
+ .count = 0,
+ .is_cache = 0
+ };
+ grub_fs_autoload_hook_t saved_autoload;
+
+ /* First try without autoloading if we're setting variable. */
+ if (var)
+ {
+ saved_autoload = grub_fs_autoload_hook;
+ grub_fs_autoload_hook = 0;
+ try (&ctx);
+
+ /* Restore autoload hook. */
+ grub_fs_autoload_hook = saved_autoload;
+
+ /* Retry with autoload if nothing found. */
+ if (grub_errno == GRUB_ERR_NONE && ctx.count == 0)
+ try (&ctx);
+ }
+ else
+ try (&ctx);
+
+ if (grub_errno == GRUB_ERR_NONE && ctx.count == 0)
+ grub_error (GRUB_ERR_FILE_NOT_FOUND, "no such device: %s", key);
+}
+
+static grub_err_t
+grub_cmd_do_search (grub_command_t cmd __attribute__ ((unused)), int argc,
+ char **args)
+{
+ if (argc == 0)
+ return grub_error (GRUB_ERR_BAD_ARGUMENT, N_("one argument expected"));
+
+ FUNC_NAME (args[0], argc == 1 ? 0 : args[1], 0, (args + 2),
+ argc > 2 ? argc - 2 : 0);
+
+ return grub_errno;
+}
+
+static grub_command_t cmd;
+
+#ifdef DO_SEARCH_FILE
+GRUB_MOD_INIT(search_fs_file)
+#elif defined (DO_SEARCH_FS_UUID)
+GRUB_MOD_INIT(search_fs_uuid)
+#else
+GRUB_MOD_INIT(search_label)
+#endif
+{
+ cmd =
+ grub_register_command (COMMAND_NAME, grub_cmd_do_search,
+ N_("NAME [VARIABLE] [HINTS]"),
+ HELP_MESSAGE);
+}
+
+#ifdef DO_SEARCH_FILE
+GRUB_MOD_FINI(search_fs_file)
+#elif defined (DO_SEARCH_FS_UUID)
+GRUB_MOD_FINI(search_fs_uuid)
+#else
+GRUB_MOD_FINI(search_label)
+#endif
+{
+ grub_unregister_command (cmd);
+}