mirror of
https://git.proxmox.com/git/grub2
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152 lines
3.7 KiB
C
152 lines
3.7 KiB
C
/*
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* GRUB -- GRand Unified Bootloader
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* Copyright (C) 1999,2000,2001,2002,2003,2006,2007,2008,2009,2010,2011,2012,2013 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 <sys/types.h>
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#include <sys/stat.h>
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#include <unistd.h>
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#include <stdint.h>
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#include <string.h>
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#include <errno.h>
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#include <grub/util/misc.h>
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#include <grub/emu/hostdisk.h>
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#include <grub/emu/getroot.h>
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#include <grub/mm.h>
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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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char *poolfs = NULL;
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/* canonicalize. */
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p = grub_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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#ifdef __linux__
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ret = grub_make_system_path_relative_to_its_root_os (p);
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if (ret)
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{
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free (p);
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return ret;
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}
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#endif
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/* For ZFS sub-pool filesystems. */
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#ifndef __HAIKU__
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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 ("%s",
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/* TRANSLATORS: canonical pathname is the
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complete one e.g. /etc/fstab. It has
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to contain `/' normally, if it doesn't
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we're in trouble and throw this error. */
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_("no `/' in canonical filename"));
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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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if (poolfs)
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return xasprintf ("/%s/@", poolfs);
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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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buf2[offset] = 0;
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free (buf2);
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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 (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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ret = buf3;
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return ret;
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}
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