Handle too long commands in Tramp

* lisp/net/tramp-sh.el (tramp-sh-handle-make-symbolic-link)
(tramp-do-file-attributes-with-ls): Send sequence of commands, in
order to not exceed shell command line limit.

* test/automated/tramp-tests.el (tramp--test-darwin-p): Remove.
(tramp--test-utf8): Include Arabic file name, again.

lisp/net/tramp-sh.el

@@ -1100,15 +1100,19 @@ target of the symlink differ."
       ;; Right, they are on the same host, regardless of user, method,
       ;; etc.  We now make the link on the remote machine. This will
       ;; occur as the user that FILENAME belongs to.
+      (and (tramp-send-command-and-check
+            l (format "cd %s" (tramp-shell-quote-argument cwd)))
            (tramp-send-command-and-check
-       l
-       (format
-	"cd %s && %s -sf %s %s"
-	(tramp-shell-quote-argument cwd)
+            l (format
+               "%s -sf %s %s"
                ln
                (tramp-shell-quote-argument filename)
-	(tramp-shell-quote-argument l-localname))
-       t))))
+               ;; The command could exceed PATH_MAX, so we use
+               ;; relative file names.  However, relative file names
+               ;; could start with "-".  `tramp-shell-quote-argument'
+               ;; does not handle this, we must do it ourselves.
+               (tramp-shell-quote-argument
+                (concat "./" (file-name-nondirectory l-localname)))))))))
 
 (defun tramp-sh-handle-file-truename (filename)
   "Like `file-truename' for Tramp files."
@@ -1266,13 +1270,21 @@ target of the symlink differ."
 		 res-inode res-filemodes res-numlinks
 		 res-uid res-gid res-size res-symlink-target)
     (tramp-message vec 5 "file attributes with ls: %s" localname)
+    ;; We cannot send all three commands combined, it could exceed
+    ;; NAME_MAX or PATH_MAX.  Happened on Mac OS X, for example.
+    (when (or (tramp-send-command-and-check
+               vec
+               (format "%s %s"
+                       (tramp-get-file-exists-command vec)
+                       (tramp-shell-quote-argument localname)))
+              (tramp-send-command-and-check
+               vec
+               (format "%s -h %s"
+                       (tramp-get-test-command vec)
+                       (tramp-shell-quote-argument localname))))
       (tramp-send-command
        vec
-     (format "(%s %s || %s -h %s) && %s %s %s %s"
-	     (tramp-get-file-exists-command vec)
-	     (tramp-shell-quote-argument localname)
-	     (tramp-get-test-command vec)
-	     (tramp-shell-quote-argument localname)
+       (format "%s %s %s %s"
                (tramp-get-ls-command vec)
                (if (eq id-format 'integer) "-ildn" "-ild")
                ;; On systems which have no quoting style, file names
@@ -1341,10 +1353,10 @@ target of the symlink differ."
            res-uid
            ;; 3. File gid.
            res-gid
-         ;; 4. Last access time, as a list of integers.  Normally this
-         ;; would be in the same format as `current-time', but the
-         ;; subseconds part is not currently implemented, and (0 0)
-         ;; denotes an unknown time.
+           ;; 4. Last access time, as a list of integers.  Normally
+           ;; this would be in the same format as `current-time', but
+           ;; the subseconds part is not currently implemented, and (0
+           ;; 0) denotes an unknown time.
            ;; 5. Last modification time, likewise.
            ;; 6. Last status change time, likewise.
            '(0 0) '(0 0) '(0 0)		;CCC how to find out?
@@ -1359,7 +1371,7 @@ target of the symlink differ."
            res-inode
            ;; 11. Device number.  Will be replaced by a virtual device number.
            -1
-         )))))
+           ))))))
 
 (defun tramp-do-file-attributes-with-perl
   (vec localname &optional id-format)

test/automated/tramp-tests.el

@@ -1785,14 +1785,6 @@ Several special characters do not work properly there."
       (file-truename tramp-test-temporary-file-directory) nil
     (string-match "^HP-UX" (tramp-get-connection-property v "uname" ""))))
 
-(defun tramp--test-darwin-p ()
-  "Check, whether the remote host runs Mac OS X.
-Several special characters do not work properly there."
-  ;; We must refill the cache.  `file-truename' does it.
-  (with-parsed-tramp-file-name
-      (file-truename tramp-test-temporary-file-directory) nil
-    (string-match "^Darwin" (tramp-get-connection-property v "uname" ""))))
-
 (defun tramp--test-check-files (&rest files)
   "Run a simple but comprehensive test over every file in FILES."
   ;; We must use `file-truename' for the temporary directory, because
@@ -2046,7 +2038,7 @@ Use the `ls' command."
 	(file-name-coding-system 'utf-8))
     (tramp--test-check-files
      (unless (tramp--test-hpux-p) "Γυρίστε το Γαλαξία με Ώτο Στοπ")
-     (unless (or (tramp--test-hpux-p) (tramp--test-darwin-p))
+     (unless (tramp--test-hpux-p)
        "أصبح بوسعك الآن تنزيل نسخة كاملة من موسوعة ويكيبيديا العربية لتصفحها بلا اتصال بالإنترنت")
      "银河系漫游指南系列"
      "Автостопом по гала́ктике")))