* bug#18623: 24.3; tramp: unhelpful error message when copy program is unavailable
@ 2014-10-03 18:34 Zack Weinberg
2014-12-21 11:18 ` Michael Albinus
0 siblings, 1 reply; 4+ messages in thread
From: Zack Weinberg @ 2014-10-03 18:34 UTC (permalink / raw)
To: 18623
`tramp' copies files by invoking a utility program, e.g. `rsync'. If
that program is unavailable on the local machine, you get the unhelpful
error message `File exists, but cannot be read.' I was only able to
figure out what was really wrong by bumping `tramp-verbose' and
inspecting the logs. (I append a sample log.)
Recipe:
Set up two computers, A and B, such that you can `ssh' into your account
on B from your account on A. Arrange for A not to have `rsync'
installed. Place a test file `test.txt' in your account on B.
Then, from A, start up Emacs and set `tramp-verbose' to 6.
Then attempt to visit `/rsync:you@B:test.txt' in Emacs.
You should observe the error message `File exists, but cannot be read.'
in the echo area.
You should observe the error message
tramp-do-copy-or-rename-file-out-of-band (1) # File error: Cannot find
copy program: rsync
in the *debug tramp/rsync B* buffer, _and nowhere else_; especially, not
in *Messages*.
`Cannot find copy program: rsync' is a perfectly sensible error message;
this bug would be resolved if _that_ were what showed up in the echo area.
--- tramp log ---
;; GNU Emacs: 24.3.1 Tramp: 2.2.6-24.3 -*- mode: outline; -*-
14:19:05.252104 tramp-send-command (6) # echo are you awake
14:19:05.267424 tramp-wait-for-regexp (6) #
are you awake
///b9ac250b8258b97dbbec98c1e1ef1117#$
14:19:05.267725 tramp-send-command (6) # test -e
/home/tbbscraperentry/tbbscraper/scripts/pj-trace-redir.js
2>/dev/null; echo tramp_exit_status $?
14:19:05.283083 tramp-wait-for-regexp (6) #
tramp_exit_status 0
///b9ac250b8258b97dbbec98c1e1ef1117#$
14:19:05.284627 tramp-send-command (6) # test -d
/home/tbbscraperentry/tbbscraper/scripts/pj-trace-redir.js
2>/dev/null; echo tramp_exit_status $?
14:19:05.299929 tramp-wait-for-regexp (6) #
tramp_exit_status 1
///b9ac250b8258b97dbbec98c1e1ef1117#$
14:19:05.301163 tramp-sh-handle-file-truename (4) # Finding true name
for `/rsync:laguz:/home/tbbscraperentry/tbbscraper/scripts/pj-trace-redir.js'
14:19:05.301410 tramp-send-command (6) # echo "\"`\readlink
--canonicalize-missing
/home/tbbscraperentry/tbbscraper/scripts/pj-trace-redir.js`\""
2>/dev/null; echo tramp_exit_status $?
14:19:05.318470 tramp-wait-for-regexp (6) #
"/home/tbbscraperentry/tbbscraper/scripts/pj-trace-redir.js"
tramp_exit_status 0
///b9ac250b8258b97dbbec98c1e1ef1117#$
14:19:05.318752 tramp-sh-handle-file-truename (4) # True name of
`/home/tbbscraperentry/tbbscraper/scripts/pj-trace-redir.js' is
`/home/tbbscraperentry/tbbscraper/scripts/pj-trace-redir.js'
14:19:05.319569 tramp-do-file-attributes-with-stat (5) # file
attributes with stat:
/home/tbbscraperentry/tbbscraper/scripts/pj-trace-redir.js
14:19:05.319851 tramp-send-command (6) # ( (test -e
/home/tbbscraperentry/tbbscraper/scripts/pj-trace-redir.js || test -h
/home/tbbscraperentry/tbbscraper/scripts/pj-trace-redir.js) && \stat
-c '(("%N") %h %ue0 %ge0 %Xe0 %Ye0 %Ze0 %se0 "%A" t %ie0 -1)'
/home/tbbscraperentry/tbbscraper/scripts/pj-trace-redir.js || echo
nil) 2>/dev/null; echo tramp_exit_status $?
14:19:05.338393 tramp-wait-for-regexp (6) #
(("`/home/tbbscraperentry/tbbscraper/scripts/pj-trace-redir.js'") 1
1000e0 1000e0 1410395278e0 1410445328e0 1410445328e0 16933e0
"-rw-r--r--" t 48637e0 -1)
tramp_exit_status 0
///b9ac250b8258b97dbbec98c1e1ef1117#$
14:19:05.343329 tramp-handle-insert-file-contents (3) # Inserting
`/rsync:laguz:/home/tbbscraperentry/tbbscraper/scripts/pj-trace-redir.js'...
14:19:05.376334 tramp-do-copy-or-rename-file (0) # Copying
/rsync:laguz:/home/tbbscraperentry/tbbscraper/scripts/pj-trace-redir.js
to /tmp/tramp.4566iIP.js...
14:19:05.377611 tramp-do-copy-or-rename-file-out-of-band (1) # File
error: Cannot find copy program: rsync
14:19:05.378100 tramp-do-copy-or-rename-file-out-of-band (0) # Copying
/rsync:laguz:/home/tbbscraperentry/tbbscraper/scripts/pj-trace-redir.js
to /tmp/tramp.4566iIP.js...done
--- emacs config details (pruned) --
In GNU Emacs 24.3.1 (x86_64-pc-linux-gnu, GTK+ Version 3.12.2)
of 2014-09-08 on binet, modified by Debian
Windowing system distributor `The X.Org Foundation', version 11.0.11601000
System Description: Debian GNU/Linux unstable (sid)
Configured using:
`configure '--build' 'x86_64-linux-gnu' '--build' 'x86_64-linux-gnu'
'--prefix=/usr' '--sharedstatedir=/var/lib' '--libexecdir=/usr/lib'
'--localstatedir=/var/lib' '--infodir=/usr/share/info'
'--mandir=/usr/share/man' '--with-pop=yes'
'--enable-locallisppath=/etc/emacs24:/etc/emacs:/usr/local/share/emacs/24.3/site-lisp:/usr/local/share/emacs/site-lisp:/usr/share/emacs/24.3/site-lisp:/usr/share/emacs/site-lisp'
'--with-crt-dir=/usr/lib/x86_64-linux-gnu' '--with-x=yes'
'--with-x-toolkit=gtk3' '--with-toolkit-scroll-bars'
'build_alias=x86_64-linux-gnu' 'CFLAGS=-g -O2 -fstack-protector-strong
-Wformat -Werror=format-security -Wall' 'LDFLAGS=-Wl,-z,relro'
'CPPFLAGS=-D_FORTIFY_SOURCE=2''
Important settings:
value of $LANG: en_US.UTF-8
locale-coding-system: utf-8-unix
default enable-multibyte-characters: t
Load-path shadows:
/usr/share/emacs/24.3/site-lisp/debian-startup hides
/usr/share/emacs/site-lisp/debian-startup
/usr/share/emacs24/site-lisp/dictionaries-common/ispell hides
/usr/share/emacs/24.3/lisp/textmodes/ispell
/usr/share/emacs24/site-lisp/dictionaries-common/flyspell hides
/usr/share/emacs/24.3/lisp/textmodes/flyspell
Features:
(shadow sort mail-extr emacsbug message rfc822 mml mml-sec mm-decode
mm-bodies mm-encode mail-parse rfc2231 mailabbrev gmm-utils mailheader
sendmail rfc2047 rfc2045 ietf-drums mail-utils pp cus-edit wid-edit
help-mode vc-git edmacro kmacro js2-mode cc-mode cc-fonts easymenu
cc-guess cc-menus cc-styles cc-align cc-cmds cc-engine cc-vars cc-defs
imenu tramp-cmds noutline outline easy-mmode tramp-cache tramp-sh paren
cus-start cus-load tramp tramp-compat auth-source eieio byte-opt
bytecomp byte-compile cconv gnus-util mm-util mail-prsvr password-cache
tramp-loaddefs shell pcomplete comint ansi-color ring format-spec advice
help-fns cl-lib advice-preload time-date tooltip ediff-hook vc-hooks
lisp-float-type mwheel x-win x-dnd tool-bar dnd fontset image regexp-opt
fringe tabulated-list newcomment lisp-mode register page menu-bar
rfn-eshadow timer select scroll-bar mouse jit-lock font-lock syntax
facemenu font-core frame cham georgian utf-8-lang misc-lang vietnamese
tibetan thai tai-viet lao korean japanese hebrew greek romanian slovak
czech european ethiopic indian cyrillic chinese case-table epa-hook
jka-cmpr-hook help simple abbrev minibuffer loaddefs button faces
cus-face macroexp files text-properties overlay sha1 md5 base64 format
env code-pages mule custom widget hashtable-print-readable backquote
make-network-process dbusbind dynamic-setting system-font-setting
font-render-setting move-toolbar gtk x-toolkit x multi-tty emacs)
^ permalink raw reply [flat|nested] 4+ messages in thread* bug#18623: 24.3; tramp: unhelpful error message when copy program is unavailable
2014-10-03 18:34 bug#18623: 24.3; tramp: unhelpful error message when copy program is unavailable Zack Weinberg
@ 2014-12-21 11:18 ` Michael Albinus
2015-02-17 21:44 ` Zack Weinberg
0 siblings, 1 reply; 4+ messages in thread
From: Michael Albinus @ 2014-12-21 11:18 UTC (permalink / raw)
To: Zack Weinberg; +Cc: 18623
Zack Weinberg <zackw@panix.com> writes:
> `Cannot find copy program: rsync' is a perfectly sensible error message;
> this bug would be resolved if _that_ were what showed up in the echo area.
I've committed the following patch to the Tramp repo as well as to the
Emacs repo (branch emacs-24):
--8<---------------cut here---------------start------------->8---
*** /tmp/ediff13503WDN 2014-12-21 12:15:48.715138335 +0100
--- /home/albinus/src/tramp/lisp/tramp.el 2014-12-21 11:30:14.424791817 +0100
***************
*** 3086,3200 ****
(setq filename (expand-file-name filename))
(let (result local-copy remote-copy)
(with-parsed-tramp-file-name filename nil
! (with-tramp-progress-reporter
! v 3 (format "Inserting `%s'" filename)
! (unwind-protect
! (if (not (file-exists-p filename))
! (progn
! ;; We don't raise a Tramp error, because it might be
! ;; suppressed, like in `find-file-noselect-1'.
! (tramp-message
! v 1 "File not `%s' found on remote host" filename)
! (signal 'file-error
! (list "File not found on remote host" filename)))
!
! (if (and (tramp-local-host-p v)
! (let (file-name-handler-alist)
! (file-readable-p localname)))
! ;; Short track: if we are on the local host, we can
! ;; run directly.
! (setq result
! (tramp-run-real-handler
! 'insert-file-contents
! (list localname visit beg end replace)))
!
! ;; When we shall insert only a part of the file, we
! ;; copy this part. This works only for the shell file
! ;; name handlers.
! (when (and (or beg end)
! (tramp-get-method-parameter
! (tramp-file-name-method v) 'tramp-login-program))
! (setq remote-copy (tramp-make-tramp-temp-file v))
! ;; This is defined in tramp-sh.el. Let's assume
! ;; this is loaded already.
! (tramp-compat-funcall
! 'tramp-send-command
! v
! (cond
! ((and beg end)
! (format "dd bs=1 skip=%d if=%s count=%d of=%s"
! beg (tramp-shell-quote-argument localname)
! (- end beg) remote-copy))
! (beg
! (format "dd bs=1 skip=%d if=%s of=%s"
! beg (tramp-shell-quote-argument localname)
! remote-copy))
! (end
! (format "dd bs=1 count=%d if=%s of=%s"
! end (tramp-shell-quote-argument localname)
! remote-copy))))
! (setq tramp-temp-buffer-file-name nil beg nil end nil))
!
! ;; `insert-file-contents-literally' takes care to
! ;; avoid calling jka-compr. By let-binding
! ;; `inhibit-file-name-operation', we propagate that
! ;; care to the `file-local-copy' operation.
! (setq local-copy
! (let ((inhibit-file-name-operation
! (when (eq inhibit-file-name-operation
! 'insert-file-contents)
! 'file-local-copy)))
! (cond
! ((stringp remote-copy)
! (file-local-copy
! (tramp-make-tramp-file-name
! method user host remote-copy)))
! ((stringp tramp-temp-buffer-file-name)
! (copy-file filename tramp-temp-buffer-file-name 'ok)
! tramp-temp-buffer-file-name)
! (t (file-local-copy filename)))))
!
! ;; When the file is not readable for the owner, it
! ;; cannot be inserted, even if it is readable for the
! ;; group or for everybody.
! (set-file-modes
! local-copy (tramp-compat-octal-to-decimal "0600"))
!
! (when (and (null remote-copy)
! (tramp-get-method-parameter
! method 'tramp-copy-keep-tmpfile))
! ;; We keep the local file for performance reasons,
! ;; useful for "rsync".
! (setq tramp-temp-buffer-file-name local-copy))
!
! ;; We must ensure that `file-coding-system-alist'
! ;; matches `local-copy'. We must also use `visit',
! ;; otherwise there might be an error in the
! ;; `revert-buffer' function under XEmacs.
! (let ((file-coding-system-alist
! (tramp-find-file-name-coding-system-alist
! filename local-copy)))
! (setq result
! (insert-file-contents
! local-copy visit beg end replace)))))
!
! ;; Save exit.
! (progn
! (when visit
! (setq buffer-file-name filename)
! (setq buffer-read-only (not (file-writable-p filename)))
! (set-visited-file-modtime)
! (set-buffer-modified-p nil))
! (when (and (stringp local-copy)
! (or remote-copy (null tramp-temp-buffer-file-name)))
! (delete-file local-copy))
! (when (stringp remote-copy)
! (delete-file
! (tramp-make-tramp-file-name method user host remote-copy)))))))
!
! ;; Result.
! (list (expand-file-name filename)
! (cadr result))))
(defun tramp-handle-load (file &optional noerror nomessage nosuffix must-suffix)
"Like `load' for Tramp files."
--- 3086,3202 ----
(setq filename (expand-file-name filename))
(let (result local-copy remote-copy)
(with-parsed-tramp-file-name filename nil
! (unwind-protect
! (if (not (file-exists-p filename))
! (tramp-message v 0 "(New file)")
!
! (with-tramp-progress-reporter
! v 3 (format "Inserting `%s'" filename)
! (condition-case err
! (if (and (tramp-local-host-p v)
! (let (file-name-handler-alist)
! (file-readable-p localname)))
! ;; Short track: if we are on the local host, we can
! ;; run directly.
! (setq result
! (tramp-run-real-handler
! 'insert-file-contents
! (list localname visit beg end replace)))
!
! ;; When we shall insert only a part of the file, we
! ;; copy this part. This works only for the shell file
! ;; name handlers.
! (when (and (or beg end)
! (tramp-get-method-parameter
! (tramp-file-name-method v)
! 'tramp-login-program))
! (setq remote-copy (tramp-make-tramp-temp-file v))
! ;; This is defined in tramp-sh.el. Let's assume
! ;; this is loaded already.
! (tramp-compat-funcall
! 'tramp-send-command
! v
! (cond
! ((and beg end)
! (format "dd bs=1 skip=%d if=%s count=%d of=%s"
! beg (tramp-shell-quote-argument localname)
! (- end beg) remote-copy))
! (beg
! (format "dd bs=1 skip=%d if=%s of=%s"
! beg (tramp-shell-quote-argument localname)
! remote-copy))
! (end
! (format "dd bs=1 count=%d if=%s of=%s"
! end (tramp-shell-quote-argument localname)
! remote-copy))))
! (setq tramp-temp-buffer-file-name nil beg nil end nil))
!
! ;; `insert-file-contents-literally' takes care to
! ;; avoid calling jka-compr. By let-binding
! ;; `inhibit-file-name-operation', we propagate that
! ;; care to the `file-local-copy' operation.
! (setq local-copy
! (let ((inhibit-file-name-operation
! (when (eq inhibit-file-name-operation
! 'insert-file-contents)
! 'file-local-copy)))
! (cond
! ((stringp remote-copy)
! (file-local-copy
! (tramp-make-tramp-file-name
! method user host remote-copy)))
! ((stringp tramp-temp-buffer-file-name)
! (copy-file
! filename tramp-temp-buffer-file-name 'ok)
! tramp-temp-buffer-file-name)
! (t (file-local-copy filename)))))
!
! ;; When the file is not readable for the owner, it
! ;; cannot be inserted, even if it is readable for the
! ;; group or for everybody.
! (set-file-modes
! local-copy (tramp-compat-octal-to-decimal "0600"))
!
! (when (and (null remote-copy)
! (tramp-get-method-parameter
! method 'tramp-copy-keep-tmpfile))
! ;; We keep the local file for performance reasons,
! ;; useful for "rsync".
! (setq tramp-temp-buffer-file-name local-copy))
!
! ;; We must ensure that `file-coding-system-alist'
! ;; matches `local-copy'. We must also use `visit',
! ;; otherwise there might be an error in the
! ;; `revert-buffer' function under XEmacs.
! (let ((file-coding-system-alist
! (tramp-find-file-name-coding-system-alist
! filename local-copy)))
! (setq result
! (insert-file-contents
! local-copy visit beg end replace))))
! (error
! (add-hook 'find-file-not-found-functions
! `(lambda () (signal ',(car err) ',(cdr err)))
! nil t)
! (signal (car err) (cdr err))))))
!
! ;; Save exit.
! (progn
! (when visit
! (setq buffer-file-name filename)
! (setq buffer-read-only (not (file-writable-p filename)))
! (set-visited-file-modtime)
! (set-buffer-modified-p nil))
! (when (and (stringp local-copy)
! (or remote-copy (null tramp-temp-buffer-file-name)))
! (delete-file local-copy))
! (when (stringp remote-copy)
! (delete-file
! (tramp-make-tramp-file-name method user host remote-copy)))))
!
! ;; Result.
! (list (expand-file-name filename)
! (cadr result)))))
(defun tramp-handle-load (file &optional noerror nomessage nosuffix must-suffix)
"Like `load' for Tramp files."
--8<---------------cut here---------------end--------------->8---
Could you, please, check whether it fits your needs?
Best regards, Michael.
^ permalink raw reply [flat|nested] 4+ messages in thread* bug#18623: 24.3; tramp: unhelpful error message when copy program is unavailable
2014-12-21 11:18 ` Michael Albinus
@ 2015-02-17 21:44 ` Zack Weinberg
2015-02-18 8:31 ` Michael Albinus
0 siblings, 1 reply; 4+ messages in thread
From: Zack Weinberg @ 2015-02-17 21:44 UTC (permalink / raw)
To: Michael Albinus; +Cc: 18623
I'm sorry it took me so long to get back to you about this. I
couldn't figure out from the patch whether it would fix the problem,
so I had to find time to actually test it, and I've been very busy the
past few months. Anyway, with this patch applied I get a nice clear
error message in the echo area when rsync isn't available on a remote
accessed via /rsync:hostname. Thanks for fixing.
zw
^ permalink raw reply [flat|nested] 4+ messages in thread
* bug#18623: 24.3; tramp: unhelpful error message when copy program is unavailable
2015-02-17 21:44 ` Zack Weinberg
@ 2015-02-18 8:31 ` Michael Albinus
0 siblings, 0 replies; 4+ messages in thread
From: Michael Albinus @ 2015-02-18 8:31 UTC (permalink / raw)
To: Zack Weinberg; +Cc: 18623-done
Version: 24.5
Zack Weinberg <zackw@panix.com> writes:
> Anyway, with this patch applied I get a nice clear
> error message in the echo area when rsync isn't available on a remote
> accessed via /rsync:hostname. Thanks for fixing.
Thanks for checking, I'm closing the bug.
> zw
Best regards, Michael.
^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~2015-02-18 8:31 UTC | newest]
Thread overview: 4+ messages (download: mbox.gz follow: Atom feed
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2014-10-03 18:34 bug#18623: 24.3; tramp: unhelpful error message when copy program is unavailable Zack Weinberg
2014-12-21 11:18 ` Michael Albinus
2015-02-17 21:44 ` Zack Weinberg
2015-02-18 8:31 ` Michael Albinus
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