505 lines
9.9 KiB
C
505 lines
9.9 KiB
C
/*
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* GRUB -- GRand Unified Bootloader
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* Copyright (C) 2002,2003,2005,2006,2007,2008,2009,2010 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 <config-util.h>
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#include <config.h>
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#include <errno.h>
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#include <error.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <stdint.h>
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#include <string.h>
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#include <sys/time.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <unistd.h>
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#ifdef HAVE_LIMITS_H
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#include <limits.h>
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#endif
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#include <grub/mm.h>
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#include <grub/err.h>
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#include <grub/env.h>
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#include <grub/types.h>
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#include <grub/misc.h>
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#include <grub/i18n.h>
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#include <grub/time.h>
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#include <grub/emu/misc.h>
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#ifdef HAVE_DEVICE_MAPPER
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# include <libdevmapper.h>
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#endif
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#ifdef HAVE_LIBZFS
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# include <grub/util/libzfs.h>
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#endif
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#ifdef HAVE_LIBNVPAIR
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# include <grub/util/libnvpair.h>
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#endif
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#ifdef HAVE_SYS_PARAM_H
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# include <sys/param.h>
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#endif
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#ifdef HAVE_SYS_MOUNT_H
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# include <sys/mount.h>
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#endif
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#ifdef HAVE_SYS_MNTTAB_H
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# include <stdio.h> /* Needed by sys/mnttab.h. */
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# include <sys/mnttab.h>
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#endif
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#ifdef HAVE_SYS_MKDEV_H
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# include <sys/mkdev.h> /* makedev */
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#endif
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int verbosity;
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void
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grub_util_warn (const char *fmt, ...)
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{
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va_list ap;
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fprintf (stderr, _("%s: warn:"), program_name);
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fprintf (stderr, " ");
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va_start (ap, fmt);
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vfprintf (stderr, fmt, ap);
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va_end (ap);
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fprintf (stderr, ".\n");
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fflush (stderr);
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}
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void
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grub_util_info (const char *fmt, ...)
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{
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if (verbosity > 0)
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{
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va_list ap;
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fprintf (stderr, _("%s: info:"), program_name);
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fprintf (stderr, " ");
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va_start (ap, fmt);
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vfprintf (stderr, fmt, ap);
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va_end (ap);
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fprintf (stderr, ".\n");
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fflush (stderr);
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}
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}
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void
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grub_util_error (const char *fmt, ...)
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{
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va_list ap;
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fprintf (stderr, _("%s: error:"), program_name);
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fprintf (stderr, " ");
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va_start (ap, fmt);
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vfprintf (stderr, fmt, ap);
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va_end (ap);
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fprintf (stderr, ".\n");
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exit (1);
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}
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void *
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xmalloc (grub_size_t size)
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{
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void *p;
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p = malloc (size);
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if (! p)
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grub_util_error ("out of memory");
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return p;
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}
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void *
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xrealloc (void *ptr, grub_size_t size)
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{
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ptr = realloc (ptr, size);
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if (! ptr)
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grub_util_error ("out of memory");
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return ptr;
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}
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char *
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xstrdup (const char *str)
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{
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size_t len;
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char *newstr;
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len = strlen (str);
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newstr = (char *) xmalloc (len + 1);
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memcpy (newstr, str, len + 1);
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return newstr;
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}
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#ifndef HAVE_VASPRINTF
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int
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vasprintf (char **buf, const char *fmt, va_list ap)
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{
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/* Should be large enough. */
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*buf = xmalloc (512);
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return vsnprintf (*buf, 512, fmt, ap);
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}
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#endif
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#ifndef HAVE_ASPRINTF
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int
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asprintf (char **buf, const char *fmt, ...)
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{
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int status;
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va_list ap;
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va_start (ap, fmt);
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status = vasprintf (buf, fmt, ap);
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va_end (ap);
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return status;
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}
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#endif
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char *
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xasprintf (const char *fmt, ...)
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{
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va_list ap;
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char *result;
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va_start (ap, fmt);
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if (vasprintf (&result, fmt, ap) < 0)
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{
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if (errno == ENOMEM)
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grub_util_error ("out of memory");
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return NULL;
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}
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return result;
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}
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void
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grub_exit (void)
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{
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exit (1);
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}
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grub_uint64_t
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grub_get_time_ms (void)
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{
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struct timeval tv;
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gettimeofday (&tv, 0);
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return (tv.tv_sec * 1000 + tv.tv_usec / 1000);
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}
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grub_uint32_t
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grub_get_rtc (void)
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{
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struct timeval tv;
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gettimeofday (&tv, 0);
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return (tv.tv_sec * GRUB_TICKS_PER_SECOND
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+ (((tv.tv_sec % GRUB_TICKS_PER_SECOND) * 1000000 + tv.tv_usec)
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* GRUB_TICKS_PER_SECOND / 1000000));
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}
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char *
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canonicalize_file_name (const char *path)
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{
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char *ret;
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#ifdef PATH_MAX
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ret = xmalloc (PATH_MAX);
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if (!realpath (path, ret))
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return NULL;
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#else
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ret = realpath (path, NULL);
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#endif
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return ret;
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}
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#ifdef __CYGWIN__
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/* Convert POSIX path to Win32 path,
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remove drive letter, replace backslashes. */
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static char *
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get_win32_path (const char *path)
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{
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char winpath[PATH_MAX];
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if (cygwin_conv_path (CCP_POSIX_TO_WIN_A, path, winpath, sizeof(winpath)))
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grub_util_error ("cygwin_conv_path() failed");
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int len = strlen (winpath);
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int offs = (len > 2 && winpath[1] == ':' ? 2 : 0);
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int i;
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for (i = offs; i < len; i++)
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if (winpath[i] == '\\')
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winpath[i] = '/';
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return xstrdup (winpath + offs);
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}
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#endif
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#ifdef HAVE_LIBZFS
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static libzfs_handle_t *__libzfs_handle;
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static void
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fini_libzfs (void)
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{
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libzfs_fini (__libzfs_handle);
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}
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libzfs_handle_t *
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grub_get_libzfs_handle (void)
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{
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if (! __libzfs_handle)
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{
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__libzfs_handle = libzfs_init ();
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if (__libzfs_handle)
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atexit (fini_libzfs);
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}
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return __libzfs_handle;
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}
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#endif /* HAVE_LIBZFS */
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#if defined(HAVE_LIBZFS) && defined(HAVE_LIBNVPAIR)
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/* ZFS has similar problems to those of btrfs (see above). */
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void
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grub_find_zpool_from_dir (const char *dir, char **poolname, char **poolfs)
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{
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char *slash;
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*poolname = *poolfs = NULL;
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#if defined(HAVE_STRUCT_STATFS_F_FSTYPENAME) && defined(HAVE_STRUCT_STATFS_F_MNTFROMNAME)
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/* FreeBSD and GNU/kFreeBSD. */
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{
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struct statfs mnt;
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if (statfs (dir, &mnt) != 0)
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return;
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if (strcmp (mnt.f_fstypename, "zfs") != 0)
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return;
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*poolname = xstrdup (mnt.f_mntfromname);
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}
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#elif defined(HAVE_GETEXTMNTENT)
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/* Solaris. */
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{
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struct stat st;
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struct extmnttab mnt;
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if (stat (dir, &st) != 0)
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return;
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FILE *mnttab = fopen ("/etc/mnttab", "r");
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if (! mnttab)
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return;
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while (getextmntent (mnttab, &mnt, sizeof (mnt)) == 0)
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{
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if (makedev (mnt.mnt_major, mnt.mnt_minor) == st.st_dev
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&& !strcmp (mnt.mnt_fstype, "zfs"))
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{
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*poolname = xstrdup (mnt.mnt_special);
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break;
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}
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}
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fclose (mnttab);
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}
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#endif
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if (! *poolname)
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return;
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slash = strchr (*poolname, '/');
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if (slash)
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{
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*slash = '\0';
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*poolfs = xstrdup (slash + 1);
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}
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else
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*poolfs = xstrdup ("");
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}
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#endif
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/* This function never prints trailing slashes (so that its output
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can be appended a slash unconditionally). */
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char *
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grub_make_system_path_relative_to_its_root (const char *path)
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{
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struct stat st;
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char *p, *buf, *buf2, *buf3, *ret;
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uintptr_t offset = 0;
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dev_t num;
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size_t len;
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#if defined(HAVE_LIBZFS) && defined(HAVE_LIBNVPAIR)
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char *poolfs = NULL;
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#endif
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/* canonicalize. */
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p = canonicalize_file_name (path);
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if (p == NULL)
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grub_util_error ("failed to get canonical path of %s", path);
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#if defined(HAVE_LIBZFS) && defined(HAVE_LIBNVPAIR)
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/* For ZFS sub-pool filesystems, could be extended to others (btrfs?). */
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{
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char *dummy;
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grub_find_zpool_from_dir (p, &dummy, &poolfs);
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}
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#endif
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len = strlen (p) + 1;
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buf = xstrdup (p);
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free (p);
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if (stat (buf, &st) < 0)
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grub_util_error ("cannot stat %s: %s", buf, strerror (errno));
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buf2 = xstrdup (buf);
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num = st.st_dev;
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/* This loop sets offset to the number of chars of the root
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directory we're inspecting. */
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while (1)
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{
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p = strrchr (buf, '/');
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if (p == NULL)
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/* This should never happen. */
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grub_util_error ("FIXME: no / in buf. (make_system_path_relative_to_its_root)");
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if (p != buf)
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*p = 0;
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else
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*++p = 0;
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if (stat (buf, &st) < 0)
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grub_util_error ("cannot stat %s: %s", buf, strerror (errno));
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/* buf is another filesystem; we found it. */
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if (st.st_dev != num)
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{
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/* offset == 0 means path given is the mount point.
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This works around special-casing of "/" in Un*x. This function never
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prints trailing slashes (so that its output can be appended a slash
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unconditionally). Each slash in is considered a preceding slash, and
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therefore the root directory is an empty string. */
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if (offset == 0)
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{
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free (buf);
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free (buf2);
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return xstrdup ("");
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}
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else
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break;
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}
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offset = p - buf;
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/* offset == 1 means root directory. */
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if (offset == 1)
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{
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/* Include leading slash. */
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offset = 0;
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break;
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}
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}
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free (buf);
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buf3 = xstrdup (buf2 + offset);
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free (buf2);
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#ifdef __CYGWIN__
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if (st.st_dev != (DEV_CYGDRIVE_MAJOR << 16))
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{
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/* Reached some mount point not below /cygdrive.
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GRUB does not know Cygwin's emulated mounts,
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convert to Win32 path. */
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grub_util_info ("Cygwin path = %s\n", buf3);
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char * temp = get_win32_path (buf3);
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free (buf3);
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buf3 = temp;
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}
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#endif
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/* Remove trailing slashes, return empty string if root directory. */
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len = strlen (buf3);
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while (len > 0 && buf3[len - 1] == '/')
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{
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buf3[len - 1] = '\0';
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len--;
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}
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#if defined(HAVE_LIBZFS) && defined(HAVE_LIBNVPAIR)
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if (poolfs)
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{
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ret = xasprintf ("/%s/@%s", poolfs, buf3);
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free (buf3);
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}
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else
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#endif
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ret = buf3;
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return ret;
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}
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#ifdef HAVE_DEVICE_MAPPER
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static void device_mapper_null_log (int level __attribute__ ((unused)),
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const char *file __attribute__ ((unused)),
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int line __attribute__ ((unused)),
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int dm_errno __attribute__ ((unused)),
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const char *f __attribute__ ((unused)),
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...)
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{
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}
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int
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grub_device_mapper_supported (void)
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{
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static int supported = -1;
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if (supported == -1)
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{
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struct dm_task *dmt;
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/* Suppress annoying log messages. */
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dm_log_with_errno_init (&device_mapper_null_log);
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dmt = dm_task_create (DM_DEVICE_VERSION);
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supported = (dmt != NULL);
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if (dmt)
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dm_task_destroy (dmt);
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/* Restore the original logger. */
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dm_log_with_errno_init (NULL);
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}
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return supported;
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}
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#endif /* HAVE_DEVICE_MAPPER */
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