*** /tmp/ediffixRi1a	2019-07-09 15:02:59.820181485 +0200
--- /home/albinus/src/tramp-2-3-stable/lisp/tramp-sh.el	2019-07-09 14:51:24.538904165 +0200
***************
*** 4465,4484 ****
  	   vec 5
  	   "Checking local compress commands `%s', `%s' for sanity"
  	   compress decompress)
! 	  (unless
! 	      (zerop
! 	       (tramp-call-local-coding-command
! 		(format
! 		 "echo %s | %s | %s" magic
! 		 ;; Windows shells need the program file name after
! 		 ;; the pipe symbol be quoted if they use forward
! 		 ;; slashes as directory separators.
! 		 (mapconcat
! 		  'shell-quote-argument (split-string compress) " ")
! 		 (mapconcat
! 		  'shell-quote-argument (split-string decompress) " "))
! 		nil nil))
! 	    (throw 'next nil))
  	  (tramp-message
  	   vec 5
  	   "Checking remote compress commands `%s', `%s' for sanity"
--- 4465,4487 ----
  	   vec 5
  	   "Checking local compress commands `%s', `%s' for sanity"
  	   compress decompress)
! 	  (with-temp-buffer
! 	    (unless (and
! 		     (zerop
! 		      (tramp-call-local-coding-command
! 		       (format
! 			"echo %s | %s | %s" magic
! 			;; Windows shells need the program file name
! 			;; after the pipe symbol be quoted if they use
! 			;; forward slashes as directory separators.
! 			(mapconcat
! 			 'shell-quote-argument (split-string compress) " ")
! 			(mapconcat
! 			 'shell-quote-argument (split-string decompress) " "))
! 		       nil t))
! 		     (string-match
! 		      (concat "^" (regexp-quote magic) "$") (buffer-string)))
! 	      (throw 'next nil)))
  	  (tramp-message
  	   vec 5
  	   "Checking remote compress commands `%s', `%s' for sanity"
***************
*** 4486,4491 ****
--- 4489,4498 ----
  	  (unless (tramp-send-command-and-check
  		   vec (format "echo %s | %s | %s" magic compress decompress) t)
  	    (throw 'next nil))
+ 	  (with-current-buffer (tramp-get-buffer vec)
+ 	    (goto-char (point-min))
+ 	    (unless (looking-at (regexp-quote magic))
+ 	      (throw 'next nil)))
  	  (setq found t)))

        ;; Did we find something?