From: Peter Jones <pjo...@redhat.com>
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.
Signed-off-by: Peter Jones <pjo...@redhat.com>
Reviewed-by: Adam Jackson <a...@redhat.com>
Signed-off-by: Javier Martinez Canillas <javi...@redhat.com>
Reviewed-by: Daniel Kiper <daniel.ki...@oracle.com>
---
Changes in v3: None
Changes in v2:
- Add a better commit message explaining why the change is needed.
- Add Reviewed-by tag from Daniel Kiper.
grub-core/osdep/windows/hostdisk.c | 6 ++++++
include/grub/osdep/hostfile_aros.h | 6 ++++++
include/grub/osdep/hostfile_unix.h | 6 ++++++
include/grub/osdep/hostfile_windows.h | 2 ++
4 files changed, 20 insertions(+)
diff --git grub-core/osdep/windows/hostdisk.c grub-core/osdep/windows/hostdisk.c
index 355100789a7..87a106c9b82 100644
--- grub-core/osdep/windows/hostdisk.c
+++ grub-core/osdep/windows/hostdisk.c
@@ -365,6 +365,12 @@ grub_util_mkdir (const char *dir)
free (windows_name);
}
+ssize_t
+grub_util_readlink (const char *name, char *buf, size_t bufsize)
+{
+ return readlink(name, buf, bufsize);
+}
+
int
grub_util_rename (const char *from, const char *to)
{
diff --git include/grub/osdep/hostfile_aros.h include/grub/osdep/hostfile_aros.h
index a059c0fa40a..161fbb7bdfd 100644
--- include/grub/osdep/hostfile_aros.h
+++ include/grub/osdep/hostfile_aros.h
@@ -68,6 +68,12 @@ grub_util_rename (const char *from, const char *to)
return rename (from, to);
}
+static inline ssize_t
+grub_util_readlink (const char *name, char *buf, size_t bufsize)
+{
+ return readlink(name, buf, bufsize);
+}
+
#define grub_util_mkdir(a) mkdir ((a), 0755)
struct grub_util_fd
diff --git include/grub/osdep/hostfile_unix.h include/grub/osdep/hostfile_unix.h
index 9ffe46fa3ca..17cd3aa8b30 100644
--- include/grub/osdep/hostfile_unix.h
+++ include/grub/osdep/hostfile_unix.h
@@ -71,6 +71,12 @@ grub_util_rename (const char *from, const char *to)
return rename (from, to);
}
+static inline ssize_t
+grub_util_readlink (const char *name, char *buf, size_t bufsize)
+{
+ return readlink(name, buf, bufsize);
+}
+
#define grub_util_mkdir(a) mkdir ((a), 0755)
#if defined (__NetBSD__)
diff --git include/grub/osdep/hostfile_windows.h
include/grub/osdep/hostfile_windows.h
index bf6451b6db4..8c92d0591bb 100644
--- include/grub/osdep/hostfile_windows.h
+++ include/grub/osdep/hostfile_windows.h
@@ -41,6 +41,8 @@ typedef struct grub_util_fd_dir *grub_util_fd_dir_t;
int
grub_util_rename (const char *from, const char *to);
+ssize_t
+grub_util_readlink (const char *name, char *buf, size_t bufsize);
int
grub_util_unlink (const char *name);
void
--
2.21.0
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