GNU bug report logs - #23914
24.5; tramp-get-remote-path fails with some shells if tramp-own-remote-path is used

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

From: Joel Ray Holveck <joelh <at> piquan.org>
To: bug-gnu-emacs <at> gnu.org
Subject: 24.5;
 tramp-get-remote-path fails with some shells if tramp-own-remote-path
 is used
Date: Fri, 08 Jul 2016 01:57:28 -0700

On FreeBSD, if tramp-own-remote-path is a member of, then using tramp's
sudo method raises an error similar to:

    byte-code: `/bin/sh -l -c 'echo 9905dea968fdd4a549d307a722e8109b \"$PATH\"'' returns with error

On FreeBSD, /bin/sh does not accept the -l flag.  bash, dash, and ksh
do, but that's not part of the POSIX shell requirements (see 
http://pubs.opengroup.org/onlinepubs/009695399/utilities/sh.html), and
historically the Bourne shell doesn't.

This can be traced to tramp-get-remote-path, where it sends the command
"%s -l %s 'echo %s \\\"$PATH\\\"'", where the first %s is the shell.

I typically remove the -l flag in that function to make my Emacs work.

Again, this only applies if tramp-own-remote-path is a member of
tramp-remote-path; otherwise, that part of the code isn't invoked.  It's
not there by default, but it's very useful.



In GNU Emacs 24.5.1 (i386-portbld-freebsd10.3, X toolkit, Xaw scroll bars)
 of 2016-06-01 on thor.piquan.org
Configured using:
 `configure --localstatedir=/var --with-dbus --without-file-notification
 --with-gconf --with-gif --with-gnutls --with-gsettings --with-jpeg
 --with-m17n-flt --with-imagemagick --with-libotf --with-png
 --with-toolkit-scroll-bars --with-rsvg --with-tiff --with-x --with-xft
 --with-xim --with-xml2 --with-xpm --with-x-toolkit=athena
 --without-xaw3d --with-sound=oss --x-libraries=/usr/local/lib
 --x-includes=/usr/local/include --prefix=/usr/local
 --mandir=/usr/local/man --infodir=/usr/local/share/emacs/info/
 --build=i386-portbld-freebsd10.3 'CFLAGS=-O2 -pipe -O2
 -fno-strict-aliasing -pipe -march=athlon64 -isystem /usr/local/include
 -fstack-protector' 'CPPFLAGS=-isystem /usr/local/include' 'LDFLAGS=
 -ltinfo -L/usr/local/lib -Wl,-rpath=/usr/local/lib -fstack-protector''

Important settings:
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Major mode: Emacs-Lisp

Minor modes in effect:
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Recent messages:
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Load-path shadows:
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/usr/local/share/emacs/24.5/site-lisp/semi/smime hides /usr/local/share/emacs/24.5/lisp/gnus/smime
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Features:
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custom widget hashtable-print-readable backquote make-network-process
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Memory information:
((conses 8 229927 39585)
 (symbols 24 29501 23)
 (miscs 20 699 1170)
 (strings 16 46836 4950)
 (string-bytes 1 1343106)
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 (buffers 512 30))

-- 
Joel Ray Holveck - joelh <at> piquan.org
   Fourth law of programming:
   Anything that can go wrong wi
sendmail: segmentation violation - core dumped

Message #8 received at 23914 <at> debbugs.gnu.org (full text, mbox):

From: Michael Albinus <michael.albinus <at> gmx.de>
To: Joel Ray Holveck <joelh <at> piquan.org>
Cc: 23914 <at> debbugs.gnu.org
Subject: Re: bug#23914: 24.5;
 tramp-get-remote-path fails with some shells if tramp-own-remote-path
 is used
Date: Sat, 09 Jul 2016 13:38:28 +0200

Joel Ray Holveck <joelh <at> piquan.org> writes:

Hi Joel,

> On FreeBSD, if tramp-own-remote-path is a member of, then using tramp's
> sudo method raises an error similar to:
>
>     byte-code: `/bin/sh -l -c 'echo 9905dea968fdd4a549d307a722e8109b \"$PATH\"'' returns with error

Well, meanwhile Tramp doesn't raise an error anymore. It simply ignores
it, what's not a solution, I know.

> On FreeBSD, /bin/sh does not accept the -l flag.  bash, dash, and ksh
> do, but that's not part of the POSIX shell requirements (see
> http://pubs.opengroup.org/onlinepubs/009695399/utilities/sh.html), and
> historically the Bourne shell doesn't.

Unfortunately, Posix does not specify how to force a login shell,
evaluating its ~/.profile and friends. If somebody knows a portable way,
how one could determine the $PATH settings of a login shell, I'll add it
to Tramp happily.

Best regards, Michael.

Message #11 received at 23914 <at> debbugs.gnu.org (full text, mbox):

From: Andreas Schwab <schwab <at> linux-m68k.org>
To: Michael Albinus <michael.albinus <at> gmx.de>
Cc: Joel Ray Holveck <joelh <at> piquan.org>, 23914 <at> debbugs.gnu.org
Subject: Re: bug#23914: 24.5;
 tramp-get-remote-path fails with some shells if tramp-own-remote-path
 is used
Date: Sat, 09 Jul 2016 14:23:02 +0200

Michael Albinus <michael.albinus <at> gmx.de> writes:

> Unfortunately, Posix does not specify how to force a login shell,

That's outside the scope of POSIX.

> evaluating its ~/.profile and friends. If somebody knows a portable way,
> how one could determine the $PATH settings of a login shell, I'll add it
> to Tramp happily.

Traditionally, the bourne shell acts as a login shell if argv[0] starts
with '-', and that's how login(1) does it.  Unfortunately, Emacs does
not provide a way to alter the value of argv[0] passed to the inferior.

Andreas.

-- 
Andreas Schwab, schwab <at> linux-m68k.org
GPG Key fingerprint = 58CA 54C7 6D53 942B 1756  01D3 44D5 214B 8276 4ED5
"And now for something completely different."

Message #14 received at 23914 <at> debbugs.gnu.org (full text, mbox):

From: Michael Albinus <michael.albinus <at> gmx.de>
To: Andreas Schwab <schwab <at> linux-m68k.org>
Cc: Joel Ray Holveck <joelh <at> piquan.org>, 23914 <at> debbugs.gnu.org
Subject: Re: bug#23914: 24.5;
 tramp-get-remote-path fails with some shells if tramp-own-remote-path
 is used
Date: Sun, 10 Jul 2016 17:07:24 +0200

Andreas Schwab <schwab <at> linux-m68k.org> writes:

>> evaluating its ~/.profile and friends. If somebody knows a portable way,
>> how one could determine the $PATH settings of a login shell, I'll add it
>> to Tramp happily.
>
> Traditionally, the bourne shell acts as a login shell if argv[0] starts
> with '-', and that's how login(1) does it.  Unfortunately, Emacs does
> not provide a way to alter the value of argv[0] passed to the inferior.

This wouldn't help. Tramp needs to invoke a login shell on the remote host.

I have added a note to the Tramp manual about this restriction (the
remote shell must support -l in order to use tramp-own-remote-path). I
have no idea what could be done else, so I propose to close this bug.

> Andreas.

Best regards, Michael.

Message #17 received at 23914 <at> debbugs.gnu.org (full text, mbox):

From: Michael Albinus <michael.albinus <at> gmx.de>
To: 23914 <at> debbugs.gnu.org,  Joel Ray Holveck <joelh <at> piquan.org>
Subject: Re: bug#23914: 24.5;
 tramp-get-remote-path fails with some shells if tramp-own-remote-path
 is used
Date: Sat, 20 Aug 2016 12:05:06 +0200

Michael Albinus <michael.albinus <at> gmx.de> writes:

> I have added a note to the Tramp manual about this restriction (the
> remote shell must support -l in order to use tramp-own-remote-path). I
> have no idea what could be done else, so I propose to close this bug.

Since commit 5126b7d6c201f95fde0d817a64620d152c1c15e1 in Emacs master,
Tramp supports the usage of the ENV environment variable. This could be
used as alternative in cases the remote shell does not support the "-l"
argument.

The Tramp manual says:

--8<---------------cut here---------------start------------->8---
Setting the ‘ENV’ environment variable instructs some shells to
read an initialization file.  Per default, TRAMP has disabled this.
You could overwrite this behaviour by evaluating

     (let ((process-environment tramp-remote-process-environment))
       (setenv "ENV" "$HOME/.profile")
       (setq tramp-remote-process-environment process-environment))
--8<---------------cut here---------------end--------------->8---

Could you please check whether this works for you, instead of using
`tramp-own-remote-path'?

Best regards, Michael.

Message #22 received at 23914-done <at> debbugs.gnu.org (full text, mbox):

From: Michael Albinus <michael.albinus <at> gmx.de>
To: 23914-done <at> debbugs.gnu.org
Cc: Joel Ray Holveck <joelh <at> piquan.org>
Subject: Re: bug#23914: 24.5;
 tramp-get-remote-path fails with some shells if tramp-own-remote-path
 is used
Date: Sun, 28 Aug 2016 10:20:23 +0200

Version: 25.2

> Could you please check whether this works for you, instead of using
> `tramp-own-remote-path'?

No response, so I'm closing the bug. Feel free to reopen if it doesn't
work for you.

Best regards, Michael.

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