Use cap-std's new read_link_contents function.

The read_link function refuses to return the value of a symlink if it's
absolute.  But read_link_contents will allow that.

crates/unftp-sbe-fs/Cargo.toml

@@ -21,7 +21,7 @@ readme = "README.md"
 [dependencies]
 async-trait = "0.1.80"
 cfg-if = "1.0"
-cap-std = "3.0"
+cap-std = "3.1"
 futures = { version = "0.3.30", default-features = false, features = ["std"] }
 lazy_static = "1.4.0"
 libunftp = { version = "0.20.1", path = "../../" }

crates/unftp-sbe-fs/src/lib.rs

@@ -114,7 +114,7 @@ impl<User: UserDetail> StorageBackend<User> for Filesystem {
             .await
             .map_err(|_| Error::from(ErrorKind::PermanentFileNotAvailable))?;
         let target = if fs_meta.is_symlink() {
-            match self.root_fd.read_link(path) {
+            match self.root_fd.read_link_contents(path) {
                 Ok(p) => Some(p),
                 Err(_e) => {
                     // XXX We should really log an error here.  But a logger object is not
@@ -143,7 +143,7 @@ impl<User: UserDetail> StorageBackend<User> for Filesystem {
                 let fullpath = path.join(entry_path.clone());
                 cap_fs::symlink_metadata(self.root_fd.clone(), fullpath.clone()).map_ok(move |meta| {
                     let target = if meta.is_symlink() {
-                        match self.root_fd.read_link(&fullpath) {
+                        match self.root_fd.read_link_contents(&fullpath) {
                             Ok(p) => Some(p),
                             Err(_e) => {
                                 // XXX We should really log an error here.  But a logger object is