GNU bug report logs - #34192
26.1; Bash 5.0 breaks TRAMP sudo

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: Allen Li <darkfeline <at> felesatra.moe>
Subject: bug#34192: closed (Re: bug#34192: 26.1; Bash 5.0 breaks TRAMP sudo)
Date: Thu, 21 Feb 2019 11:21:02 +0000

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Your bug report

#34192: 26.1; Bash 5.0 breaks TRAMP sudo

which was filed against the emacs package, has been closed.

The explanation is attached below, along with your original report.
If you require more details, please reply to 34192 <at> debbugs.gnu.org.

-- 
34192: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=34192
GNU Bug Tracking System
Contact help-debbugs <at> gnu.org with problems

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From: Michael Albinus <michael.albinus <at> gmx.de>
To: Allen Li <darkfeline <at> felesatra.moe>
Cc: 34192-done <at> debbugs.gnu.org
Subject: Re: bug#34192: 26.1; Bash 5.0 breaks TRAMP sudo
Date: Thu, 21 Feb 2019 12:20:15 +0100

Emacs 26.2

Hi Allen,

> I've got an answer from the bash maintainer. He confirms the problem,
> and he has sent also a patch. I've tested the patch; it fixes the
> problem in my environment with bash 5.0.
>
> Will forward that message. So we have to wait for a new bash 5.0.x
> version which fixes this. In the meantime, I'll write a warning in the
> Tramp doc.

I've documented this in the Tramp manual, pushed to the emacs-26
branch. Since there's nothing left on Emacs side we could do, I'm
closing the bug.

Best regards, Michael.

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From: Allen Li <darkfeline <at> felesatra.moe>
To: bug-gnu-emacs <at> gnu.org
Subject: 26.1; Bash 5.0 breaks TRAMP sudo
Date: Thu, 24 Jan 2019 22:14:51 +0000

I believe Bash 5.0 breaks TRAMP sudo in
tramp-sh-handle-file-name-all-completions.

Using Bash 5.0 and (find-file "/sudo::/") results in an error "Process
has died".  Setting tramp-verbose to 9 shows that it dies around here:

13:56:22.449785 tramp-maybe-send-script (5) # Sending script
‘tramp_perl_file_name_all_completions’...
13:56:22.449920 tramp-send-command (6) #
tramp_perl_file_name_all_completions () {
\perl -e '
opendir(d, $ARGV[0]) || die("$ARGV[0]: $!\nfail\n");
@files = readdir(d); closedir(d);
foreach $f (@files) {
 if (-d "$ARGV[0]/$f") {
  print "$f/\n";
 }
 else {
  print "$f\n";
 }
}
print "ok\n"
' "$1" 2>/dev/null
} 2>/dev/null; echo tramp_exit_status $?
13:56:25.428280 tramp-maybe-send-script (5) # Sending script
‘tramp_perl_file_name_all_completions’...failed

Note that I cannot reproduce this from emacs -Q because out of the box,
TRAMP sudo does not seem to call
tramp-sh-handle-file-name-all-completions and I don't have time right
now to figure out what setting enables that code path.

Switching my /bin/sh to Dash instead of Bash 5.0 immediately fixed the
problem, which strongly led me to suspect some subtle change in Bash 5.0
broke this.

In GNU Emacs 26.1 (build 1, x86_64-pc-linux-gnu, GTK+ Version 3.22.30)
 of 2018-07-05 built on juergen
Windowing system distributor 'The X.Org Foundation', version 11.0.12003000

Configured using:
 'configure --prefix=/usr --sysconfdir=/etc --libexecdir=/usr/lib
 --localstatedir=/var --with-x-toolkit=gtk3 --with-xft --with-modules
 'CFLAGS=-march=x86-64 -mtune=generic -O2 -pipe -fstack-protector-strong
 -fno-plt' CPPFLAGS=-D_FORTIFY_SOURCE=2
 LDFLAGS=-Wl,-O1,--sort-common,--as-needed,-z,relro,-z,now'

Configured features:
XPM JPEG TIFF GIF PNG RSVG IMAGEMAGICK SOUND GPM DBUS GSETTINGS NOTIFY
ACL GNUTLS LIBXML2 FREETYPE M17N_FLT LIBOTF XFT ZLIB TOOLKIT_SCROLL_BARS
GTK3 X11 MODULES THREADS LIBSYSTEMD LCMS2

Important settings:
  value of $LANG: en_US.UTF-8
  locale-coding-system: utf-8-unix

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