Some minor Tramp corrections

* lisp/net/tramp.el (tramp-handle-directory-file-name):
Handle several trailing slashes correctly.
(tramp-handle-file-selinux-context): New defun.

* lisp/net/tramp-adb.el (tramp-adb-file-name-handler-alist):
* lisp/net/tramp-gvfs.el (tramp-gvfs-file-name-handler-alist):
* lisp/net/tramp-smb.el (tramp-smb-file-name-handler-alist):
Use `tramp-handle-file-selinux-context'.

* test/lisp/net/tramp-tests.el (tramp-test06-directory-file-name):
Extend test.
(tramp-test17-insert-directory): Make check more robust.
(tramp-test42-auto-load): Combine several let forms.
(tramp-test42-delay-load, tramp-test42-recursive-load)
(tramp-test42-remote-load-path, tramp-test43-unload): Rename.

4 files changed, 15 insertions, 11 deletions

diff --git a/lisp/net/tramp-adb.el b/lisp/net/tramp-adb.el
index bf21db2e8d8..8399c02923d 100644
--- a/lisp/net/tramp-adb.el
+++ b/lisp/net/tramp-adb.el
@@ -137,7 +137,7 @@ It is used for TCP/IP devices."
     (file-readable-p . tramp-handle-file-exists-p)
     (file-regular-p . tramp-handle-file-regular-p)
     (file-remote-p . tramp-handle-file-remote-p)
-    (file-selinux-context . ignore)
+    (file-selinux-context . tramp-handle-file-selinux-context)
     (file-symlink-p . tramp-handle-file-symlink-p)
     (file-system-info . tramp-adb-handle-file-system-info)
     (file-truename . tramp-adb-handle-file-truename)
diff --git a/lisp/net/tramp-gvfs.el b/lisp/net/tramp-gvfs.el
index 404af983b50..fe5a98909e0 100644
--- a/lisp/net/tramp-gvfs.el
+++ b/lisp/net/tramp-gvfs.el
@@ -517,7 +517,7 @@ Every entry is a list (NAME ADDRESS).")
     (file-readable-p . tramp-gvfs-handle-file-readable-p)
     (file-regular-p . tramp-handle-file-regular-p)
     (file-remote-p . tramp-handle-file-remote-p)
-    (file-selinux-context . ignore)
+    (file-selinux-context . tramp-handle-file-selinux-context)
     (file-symlink-p . tramp-handle-file-symlink-p)
     (file-system-info . tramp-gvfs-handle-file-system-info)
     (file-truename . tramp-handle-file-truename)
diff --git a/lisp/net/tramp-smb.el b/lisp/net/tramp-smb.el
index f35c10b58ab..eb0d6b50731 100644
--- a/lisp/net/tramp-smb.el
+++ b/lisp/net/tramp-smb.el
@@ -253,7 +253,7 @@ See `tramp-actions-before-shell' for more info.")
     (file-readable-p . tramp-handle-file-exists-p)
     (file-regular-p . tramp-handle-file-regular-p)
     (file-remote-p . tramp-handle-file-remote-p)
-    ;; `file-selinux-context' performed by default handler.
+    (file-selinux-context . tramp-handle-file-selinux-context)
     (file-symlink-p . tramp-handle-file-symlink-p)
     (file-system-info . tramp-smb-handle-file-system-info)
     (file-truename . tramp-handle-file-truename)
diff --git a/lisp/net/tramp.el b/lisp/net/tramp.el
index 13277ec6f34..6b0b1da6eb6 100644
--- a/lisp/net/tramp.el
+++ b/lisp/net/tramp.el
@@ -2937,14 +2937,13 @@ User is always nil."
   "Like `directory-file-name' for Tramp files."
   ;; If localname component of filename is "/", leave it unchanged.
   ;; Otherwise, remove any trailing slash from localname component.
-  ;; Method, host, etc, are unchanged.  Does it make sense to try
-  ;; to avoid parsing the filename?
-  (with-parsed-tramp-file-name directory nil
-    (if (and (not (zerop (length localname)))
-             (eq (aref localname (1- (length localname))) ?/)
-             (not (string= localname "/")))
-        (substring directory 0 -1)
-      directory)))
+  ;; Method, host, etc, are unchanged.
+  (while (with-parsed-tramp-file-name directory nil
+           (and (not (zerop (length localname)))
+                (eq (aref localname (1- (length localname))) ?/)
+                (not (string= localname "/"))))
+    (setq directory (substring directory 0 -1)))
+  directory)
 
 (defun tramp-handle-directory-files (directory &optional full match nosort)
   "Like `directory-files' for Tramp files."
@@ -3172,6 +3171,11 @@ User is always nil."
                 (t (tramp-make-tramp-file-name
                     method user domain host port "" hop)))))))))
 
+(defun tramp-handle-file-selinux-context (_filename)
+  "Like `file-selinux-context' for Tramp files."
+  ;; Return nil context.
+  '(nil nil nil nil))
+
 (defun tramp-handle-file-symlink-p (filename)
   "Like `file-symlink-p' for Tramp files."
   (let ((x (tramp-compat-file-attribute-type (file-attributes filename))))