157 lines
3.6 KiB
C
157 lines
3.6 KiB
C
/* autofs.c - support auto-loading from fs.lst */
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/*
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* GRUB -- GRand Unified Bootloader
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* Copyright (C) 2009 Free Software Foundation, Inc.
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*
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* GRUB is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* GRUB is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with GRUB. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <grub/mm.h>
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#include <grub/dl.h>
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#include <grub/env.h>
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#include <grub/misc.h>
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#include <grub/fs.h>
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#include <grub/normal.h>
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/* This is used to store the names of filesystem modules for auto-loading. */
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static grub_named_list_t fs_module_list;
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/* The auto-loading hook for filesystems. */
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static int
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autoload_fs_module (void)
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{
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grub_named_list_t p;
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int ret = 0;
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grub_file_filter_t grub_file_filters_was[GRUB_FILE_FILTER_MAX];
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grub_memcpy (grub_file_filters_was, grub_file_filters_enabled,
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sizeof (grub_file_filters_enabled));
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grub_memcpy (grub_file_filters_enabled, grub_file_filters_all,
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sizeof (grub_file_filters_enabled));
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while ((p = fs_module_list) != NULL)
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{
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if (! grub_dl_get (p->name) && grub_dl_load (p->name))
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{
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ret = 1;
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break;
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}
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if (grub_errno)
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grub_print_error ();
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fs_module_list = p->next;
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grub_free (p->name);
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grub_free (p);
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}
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grub_memcpy (grub_file_filters_enabled, grub_file_filters_was,
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sizeof (grub_file_filters_enabled));
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return ret;
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}
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/* Read the file fs.lst for auto-loading. */
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void
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read_fs_list (const char *prefix)
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{
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if (prefix)
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{
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char *filename;
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filename = grub_xasprintf ("%s/" GRUB_TARGET_CPU "-" GRUB_PLATFORM
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"/fs.lst", prefix);
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if (filename)
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{
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grub_file_t file;
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grub_fs_autoload_hook_t tmp_autoload_hook;
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/* This rules out the possibility that read_fs_list() is invoked
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recursively when we call grub_file_open() below. */
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tmp_autoload_hook = grub_fs_autoload_hook;
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grub_fs_autoload_hook = NULL;
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file = grub_file_open (filename);
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if (file)
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{
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/* Override previous fs.lst. */
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while (fs_module_list)
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{
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grub_named_list_t tmp;
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tmp = fs_module_list->next;
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grub_free (fs_module_list);
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fs_module_list = tmp;
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}
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while (1)
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{
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char *buf;
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char *p;
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char *q;
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grub_named_list_t fs_mod;
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buf = grub_file_getline (file);
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if (! buf)
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break;
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p = buf;
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q = buf + grub_strlen (buf) - 1;
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/* Ignore space. */
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while (grub_isspace (*p))
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p++;
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while (p < q && grub_isspace (*q))
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*q-- = '\0';
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/* If the line is empty, skip it. */
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if (p >= q)
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{
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grub_free (buf);
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continue;
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}
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fs_mod = grub_malloc (sizeof (*fs_mod));
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if (! fs_mod)
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{
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grub_free (buf);
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continue;
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}
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fs_mod->name = grub_strdup (p);
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grub_free (buf);
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if (! fs_mod->name)
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{
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grub_free (fs_mod);
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continue;
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}
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fs_mod->next = fs_module_list;
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fs_module_list = fs_mod;
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}
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grub_file_close (file);
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grub_fs_autoload_hook = tmp_autoload_hook;
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}
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grub_free (filename);
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}
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}
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/* Ignore errors. */
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grub_errno = GRUB_ERR_NONE;
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/* Set the hook. */
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grub_fs_autoload_hook = autoload_fs_module;
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}
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