unlink old database file before creating a new one

udev_db_add_device() can be called when the corressponding database
entry already exists - it should overwrite the old entry in this case.
However, if the old entry was a symlink, fopen(filename, "w") will not
overwrite it properly - it will keep the symlink and create a file
named after the symlink target.  Calling unlink(filename) before
trying to create the database file fixes the problem.

Signed-off-by: Sergey Vlasov <vsu@altlinux.ru>

diff --git a/udev_db.c b/udev_db.c
index f3c9509dcc8767c592af4ce17a0a010eca94143b..b1217d80e1a79273b5ccf5a9077b5326444582aa 100644 (file)
--- a/udev_db.c
+++ b/udev_db.c
@@ -93,6 +93,7 @@ int udev_db_add_device(struct udevice *udev)
                struct name_entry *name_loop;
                FILE *f;
 
+               unlink(filename);
                f = fopen(filename, "w");
                if (f == NULL) {
                        err("unable to create db file '%s': %s", filename, strerror(errno));