GNU bug report logs - #23041
tramp recreates /dev/null as a regular file when history limit is hit

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Attila Molnár <ate.molnar2 <at> gmail.com>
To: bug-gnu-emacs <at> gnu.org
Subject: tramp recreates /dev/null as a regular file when history limit is hit
Date: Thu, 17 Mar 2016 15:24:04 +0100

[Message part 1 (text/plain, inline)]

Hi,

I am Attila Molnar, from a small start-up from Hungary

Well the subject pretty well describes the problem...

I tried to override the history file value with:

(package-initialize)
(require 'tramp)
(defvar tramp-histfile-override "~/.tramp_history" "Prevent tramp from
using /dev/null and recreating it as a regular file when history size is
reached.")

With no success. However, I found the problem in the source code and fixed
it:

@@ -3865,7 +3865,7 @@ file exists and nonzero exit status otherwise."
       ;; the prompt in /bin/bash, it must be discarded as well.
       (tramp-send-command
        vec (format
-    "exec env ENV='' HISTFILE=/dev/null PROMPT_COMMAND='' PS1=%s PS2=''
PS3='' %s %s"
+    "exec env ENV='' HISTFILE=~/.tramp_history PROMPT_COMMAND='' PS1=%s
PS2='' PS3='' %s %s"
     (tramp-shell-quote-argument tramp-end-of-output)
     shell (or extra-args ""))
        t))
@@ -4587,7 +4587,7 @@ connection if a previous connection has died for some
reason."
  (delete-process p))
       (setenv "TERM" tramp-terminal-type)
       (setenv "LC_ALL" "en_US.utf8")
-      (setenv "HISTFILE" "/dev/null")
+      (setenv "HISTFILE" "~/.tramp_history")
       (setenv "PROMPT_COMMAND")
       (setenv "PS1" tramp-initial-end-of-output)
       (let* ((target-alist (tramp-compute-multi-hops vec))


Data about my Emacs:

In GNU Emacs 24.5.1 (x86_64-pc-linux-gnu, GTK+ Version 3.18.7)
 of 2016-03-07 on attilaWorkStation
Windowing system distributor `The X.Org Foundation', version 11.0.11704000
System Description: NAME=Gentoo

Configured using:
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Recent messages:
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(No files need saving)
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[Message part 2 (text/html, inline)]

Message #10 received at 23041 <at> debbugs.gnu.org (full text, mbox):

From: Michael Albinus <michael.albinus <at> gmx.de>
To: Attila Molnár <ate.molnar2 <at> gmail.com>
Cc: 23041 <at> debbugs.gnu.org
Subject: Re: bug#23041: tramp recreates /dev/null as a regular file when
 history limit is hit
Date: Thu, 17 Mar 2016 21:05:33 +0100

Attila Molnár <ate.molnar2 <at> gmail.com> writes:

> Hi,

Hi Attila,

> I am Attila Molnar, from a small start-up from Hungary
>
> Well the subject pretty well describes the problem...

Thanks for the bug report. It is the same problem as 19731 and 21697. It
is fixed already in the upcoming Emacs 25.1.

Best regards, Michael.

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