03e72830ab
Currently grub-editenv and related tools are not able to follow symbolic links when finding their config file. For example the grub-editenv create command will wrongly overwrite a symlink in /boot/grub2/grubenv with a new regular file, instead of creating a file in the path the symlink points to. A following patch will change that and add support in grub-editenv to follow symbolic links when finding the grub environment variables file. Add a grub_util_readlink() helper function that is just a wrapper around the platform specific function to read the value of a symbolic link. This helper function will be used by the following patch for grub-editenv. The helper function is not added for Windows, since this operating system doesn't have a primitive to read the contents of a symbolic link. Signed-off-by: Peter Jones <pjones@redhat.com> Reviewed-by: Adam Jackson <ajax@redhat.com> Signed-off-by: Javier Martinez Canillas <javierm@redhat.com> Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
118 lines
2.8 KiB
C
118 lines
2.8 KiB
C
/*
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* GRUB -- GRand Unified Bootloader
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* Copyright (C) 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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#ifndef GRUB_EMU_HOSTFILE_H
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#define GRUB_EMU_HOSTFILE_H 1
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#include <config.h>
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#include <stdarg.h>
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#include <grub/symbol.h>
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#include <grub/types.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <dirent.h>
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#include <unistd.h>
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#include <stdio.h>
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typedef struct dirent *grub_util_fd_dirent_t;
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typedef DIR *grub_util_fd_dir_t;
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static inline grub_util_fd_dir_t
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grub_util_fd_opendir (const char *name)
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{
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return opendir (name);
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}
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static inline void
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grub_util_fd_closedir (grub_util_fd_dir_t dirp)
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{
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closedir (dirp);
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}
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static inline grub_util_fd_dirent_t
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grub_util_fd_readdir (grub_util_fd_dir_t dirp)
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{
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return readdir (dirp);
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}
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static inline int
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grub_util_unlink (const char *pathname)
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{
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return unlink (pathname);
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}
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static inline int
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grub_util_rmdir (const char *pathname)
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{
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return rmdir (pathname);
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}
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static inline int
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grub_util_rename (const char *from, const char *to)
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{
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return rename (from, to);
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}
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static inline ssize_t
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grub_util_readlink (const char *name, char *buf, size_t bufsize)
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{
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return readlink(name, buf, bufsize);
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}
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#define grub_util_mkdir(a) mkdir ((a), 0755)
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#if defined (__NetBSD__)
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/* NetBSD uses /boot for its boot block. */
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# define DEFAULT_DIRECTORY "/"GRUB_DIR_NAME
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#else
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# define DEFAULT_DIRECTORY "/"GRUB_BOOT_DIR_NAME"/"GRUB_DIR_NAME
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#endif
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enum grub_util_fd_open_flags_t
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{
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GRUB_UTIL_FD_O_RDONLY = O_RDONLY,
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GRUB_UTIL_FD_O_WRONLY = O_WRONLY,
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GRUB_UTIL_FD_O_RDWR = O_RDWR,
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GRUB_UTIL_FD_O_CREATTRUNC = O_CREAT | O_TRUNC,
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GRUB_UTIL_FD_O_SYNC = (0
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#ifdef O_SYNC
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| O_SYNC
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#endif
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#ifdef O_FSYNC
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| O_FSYNC
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#endif
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)
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};
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#define DEFAULT_DEVICE_MAP DEFAULT_DIRECTORY "/device.map"
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typedef int grub_util_fd_t;
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#define GRUB_UTIL_FD_INVALID -1
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#define GRUB_UTIL_FD_IS_VALID(x) ((x) >= 0)
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#define GRUB_UTIL_FD_STAT_IS_FUNCTIONAL 1
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#if defined(__FreeBSD__) || defined(__FreeBSD_kernel__) || defined(__APPLE__) || defined(__NetBSD__) || defined (__sun__) || defined(__OpenBSD__) || defined(__HAIKU__)
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#define GRUB_DISK_DEVS_ARE_CHAR 1
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#else
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#define GRUB_DISK_DEVS_ARE_CHAR 0
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#endif
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#endif
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