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Subject: bug#36583: 26.1; emacs 26 tries loading original user's .emacs after su to root
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debian 10 "buster", amd64
GNU Emacs 26.1 (build 2, x86_64-pc-linux-gnu, GTK+ Version 3.24.4) of 2019-=
02-03, modified by Debian
- I did /bin/su from my own user to root
- When I started emacs I got the following error message:
Warning (initialization): An error occurred while loading =E2=80=98/home/s=
b/.emacs=E2=80=99:
File is missing: Cannot open load file, No such file or directory, editorco=
nfig
To ensure normal operation, you should investigate and remove the
cause of the error in your initialization file. Start Emacs with
the =E2=80=98--debug-init=E2=80=99 option to view a complete error backtrac=
e.
- Ie. emacs tried to load the original user's .emacs and fails (and the
configuration of the editor is kind of broken)
Results of HOME and id after su:
root@cadalora:~# env | grep HOME
HOME=3D/root
root@cadalora:~# id
uid=3D0(root) gid=3D0(root) groups=3D0(root)
root@cadalora:~#
- When I do "/bin/su - root" then emacs reports no error messages on
startup
Results of HOME and id looks the same:
root@cadalora:~# env | grep HOME
HOME=3D/root
root@cadalora:~# id
uid=3D0(root) gid=3D0(root) groups=3D0(root)
root@cadalora:~#
Content-Disposition: inline Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-Mailer: MIME-tools 5.505 (Entity 5.505) Content-Type: text/plain; charset=utf-8 X-Loop: help-debbugs@HIDDEN From: help-debbugs@HIDDEN (GNU bug Tracking System) To: Steinar Bang <sb@HIDDEN> Subject: bug#36583: Acknowledgement (26.1; emacs 26 tries loading original user's .emacs after su to root) Message-ID: <handler.36583.B.156279022427538.ack <at> debbugs.gnu.org> References: <87ims94p6p.fsf@HIDDEN> X-Gnu-PR-Message: ack 36583 X-Gnu-PR-Package: emacs Reply-To: 36583 <at> debbugs.gnu.org Date: Wed, 10 Jul 2019 20:24:02 +0000 Thank you for filing a new bug report with debbugs.gnu.org. This is an automatically generated reply to let you know your message has been received. Your message is being forwarded to the package maintainers and other interested parties for their attention; they will reply in due course. Your message has been sent to the package maintainer(s): bug-gnu-emacs@HIDDEN If you wish to submit further information on this problem, please send it to 36583 <at> debbugs.gnu.org. Please do not send mail to help-debbugs@HIDDEN unless you wish to report a problem with the Bug-tracking system. --=20 36583: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=3D36583 GNU Bug Tracking System Contact help-debbugs@HIDDEN with problems
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Subject: bug#36583: 26.1; emacs 26 tries loading original user's .emacs after su to root
Resent-From: Glenn Morris <rgm@HIDDEN>
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This is explicitly documented in the manual.
"How Emacs Finds Your Init File".
Received: (at control) by debbugs.gnu.org; 10 Jul 2019 20:52:06 +0000 From debbugs-submit-bounces <at> debbugs.gnu.org Wed Jul 10 16:52:06 2019 Received: from localhost ([127.0.0.1]:36693 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from <debbugs-submit-bounces <at> debbugs.gnu.org>) id 1hlJZN-0007rd-Qj for submit <at> debbugs.gnu.org; Wed, 10 Jul 2019 16:52:06 -0400 Received: from eggs.gnu.org ([209.51.188.92]:54762) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from <rgm@HIDDEN>) id 1hlJZM-0007r5-G5 for control <at> debbugs.gnu.org; Wed, 10 Jul 2019 16:52:04 -0400 Received: from fencepost.gnu.org ([2001:470:142:3::e]:51789) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from <rgm@HIDDEN>) id 1hlJZH-0005ZQ-9w for control <at> debbugs.gnu.org; Wed, 10 Jul 2019 16:51:59 -0400 Received: from rgm by fencepost.gnu.org with local (Exim 4.82) (envelope-from <rgm@HIDDEN>) id 1hlJZG-0002kU-Nf for control <at> debbugs.gnu.org; Wed, 10 Jul 2019 16:51:58 -0400 Subject: control message for bug 36583 To: <control <at> debbugs.gnu.org> X-Mailer: mail (GNU Mailutils 2.99.98) Message-Id: <E1hlJZG-0002kU-Nf@HIDDEN> From: Glenn Morris <rgm@HIDDEN> Date: Wed, 10 Jul 2019 16:51:58 -0400 X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-Spam-Score: -2.3 (--) X-Debbugs-Envelope-To: control X-BeenThere: debbugs-submit <at> debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: <debbugs-submit.debbugs.gnu.org> List-Unsubscribe: <https://debbugs.gnu.org/cgi-bin/mailman/options/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=unsubscribe> List-Archive: <https://debbugs.gnu.org/cgi-bin/mailman/private/debbugs-submit/> List-Post: <mailto:debbugs-submit <at> debbugs.gnu.org> List-Help: <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=help> List-Subscribe: <https://debbugs.gnu.org/cgi-bin/mailman/listinfo/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=subscribe> Errors-To: debbugs-submit-bounces <at> debbugs.gnu.org Sender: "Debbugs-submit" <debbugs-submit-bounces <at> debbugs.gnu.org> X-Spam-Score: -3.3 (---) tag 36583 notabug wontfix close 36583
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Subject: bug#36583: 26.1; emacs 26 tries loading original user's .emacs after su to root
Resent-From: Stefan Monnier <monnier@HIDDEN>
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From: Stefan Monnier <monnier@HIDDEN>
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References: <87ims94p6p.fsf@HIDDEN> <m3sgrdtxzx.fsf@HIDDEN>
Date: Thu, 11 Jul 2019 18:58:40 -0400
In-Reply-To: <m3sgrdtxzx.fsf@HIDDEN> (Glenn Morris's message of
"Wed, 10 Jul 2019 16:50:42 -0400")
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> This is explicitly documented in the manual.
> "How Emacs Finds Your Init File".
FWIW, I find this behavior very surprising (and dangerous).
Apparently you can circumvent it by setting LOGNAME to "root".
I can't find the place in code which distinguishes this case from the
case where the user doesn't `su` but instead sets his $HOME to some
other place, such as:
HOME=/home/monnier/tmp/home emacs
BTW, thinking about "dangerous" above, I guess the behavior might make
sense when you're `su`ing *from* root rather than the other way around.
Stefan
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Subject: bug#36583: 26.1; emacs 26 tries loading original user's .emacs after su to root
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From: Lars Ingebrigtsen <larsi@HIDDEN>
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Date: Fri, 12 Jul 2019 01:17:21 +0200
In-Reply-To: <jwvbly0yzbl.fsf-monnier+emacs@HIDDEN> (Stefan Monnier's message
of "Thu, 11 Jul 2019 18:58:40 -0400")
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Content preview: Stefan Monnier <monnier@HIDDEN> writes: > FWIW,
I find this behavior very surprising (and dangerous). Yes, me too. I can't
think of any other program that behaves in this manner.
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Stefan Monnier <monnier@HIDDEN> writes:
> FWIW, I find this behavior very surprising (and dangerous).
Yes, me too. I can't think of any other program that behaves in this
manner.
> BTW, thinking about "dangerous" above, I guess the behavior might make
> sense when you're `su`ing *from* root rather than the other way around.
By default, /root on many systems isn't readable by anybody but root, so
I don't think it makes much sense in any situation...
I think Emacs shouldn't do this at all. When was this introduced, and
what was the reasoning behind it?
--
(domestic pets only, the antidote for overdose, milk.)
bloggy blog: http://lars.ingebrigtsen.no
X-Loop: help-debbugs@HIDDEN
Subject: bug#36583: 26.1; emacs 26 tries loading original user's .emacs after su to root
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From: Stefan Monnier <monnier@HIDDEN>
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References: <87ims94p6p.fsf@HIDDEN> <m3sgrdtxzx.fsf@HIDDEN>
<jwvbly0yzbl.fsf-monnier+emacs@HIDDEN> <m37e8op3em.fsf@HIDDEN>
Date: Thu, 11 Jul 2019 20:38:55 -0400
In-Reply-To: <m37e8op3em.fsf@HIDDEN> (Lars Ingebrigtsen's message of "Fri,
12 Jul 2019 01:17:21 +0200")
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>> BTW, thinking about "dangerous" above, I guess the behavior might make
>> sense when you're `su`ing *from* root rather than the other way around.
> By default, /root on many systems isn't readable by anybody but root, so
> I don't think it makes much sense in any situation...
Good point.
> I think Emacs shouldn't do this at all. When was this introduced, and
> what was the reasoning behind it?
The Texinfo says:
[...]
@xref{Entering Emacs,,, emacs, The GNU Emacs Manual}. If neither
option is specified, Emacs uses the @env{LOGNAME} environment
variable, or the @env{USER} (most systems) or @env{USERNAME} (MS
systems) variable, to find your home directory and thus your init
file; this way, even if you have su'd, Emacs still loads your own init
file. If those environment variables are absent, though, Emacs uses
your user-id to find your home directory.
and it's at least as old as 2007 probably long before.
I still haven't found the corresponding code, so I can't confirm
the origin.
[...hhhmmm...] Ha! Found it!
commit a726e0d12ccb1c49ca1f3e1fbe64addea9b7d3b4
Author: Jim Blandy <jimb@HIDDEN>
Date: Thu Jul 11 23:17:40 1991 +0000
Initial revision
diff --git a/lisp/startup.el b/lisp/startup.el
--- /dev/null
+++ b/lisp/startup.el
@@ -0,0 +160,6 @@
+ ;; Figure out which user's init file to load,
+ ;; either from the environment or from the options.
+ (setq init-file-user (if noninteractive nil (user-login-name)))
+ ;; If user has not done su, use current $HOME to find .emacs.
+ (and init-file-user (string= init-file-user (user-real-login-name))
+ (setq init-file-user ""))
So yes, goes back pretty far.
Stefan
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Subject: bug#36583: 26.1; emacs 26 tries loading original user's .emacs after su to root
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> From: Stefan Monnier <monnier@HIDDEN>
> Date: Thu, 11 Jul 2019 18:58:40 -0400
> Cc: Steinar Bang <sb@HIDDEN>, 36583 <at> debbugs.gnu.org
>
> > This is explicitly documented in the manual.
> > "How Emacs Finds Your Init File".
>
> FWIW, I find this behavior very surprising (and dangerous).
Why is it dangerous?
X-Loop: help-debbugs@HIDDEN
Subject: bug#36583: 26.1; emacs 26 tries loading original user's .emacs after su to root
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Date: Fri, 12 Jul 2019 16:34:05 +0200
In-Reply-To: <jwvv9w8xfjw.fsf-monnier+emacs@HIDDEN> (Stefan Monnier's message
of "Thu, 11 Jul 2019 20:38:55 -0400")
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Content preview: Stefan Monnier <monnier@HIDDEN> writes: >
[...hhhmmm...]
Ha! Found it! > > commit a726e0d12ccb1c49ca1f3e1fbe64addea9b7d3b4 > Author:
Jim Blandy <jimb@HIDDEN> > Date: Thu Jul 11 23:17:40 1991 +0000 > >
Initial revision > > diff --git a/l [...]
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Stefan Monnier <monnier@HIDDEN> writes:
> [...hhhmmm...] Ha! Found it!
>
> commit a726e0d12ccb1c49ca1f3e1fbe64addea9b7d3b4
> Author: Jim Blandy <jimb@HIDDEN>
> Date: Thu Jul 11 23:17:40 1991 +0000
>
> Initial revision
>
> diff --git a/lisp/startup.el b/lisp/startup.el
> --- /dev/null
> +++ b/lisp/startup.el
> @@ -0,0 +160,6 @@
> + ;; Figure out which user's init file to load,
> + ;; either from the environment or from the options.
> + (setq init-file-user (if noninteractive nil (user-login-name)))
> + ;; If user has not done su, use current $HOME to find .emacs.
> + (and init-file-user (string= init-file-user (user-real-login-name))
> + (setq init-file-user ""))
>
> So yes, goes back pretty far.
Oh, wow. :-)
There was a similar bug report for "sudo" the other week where the
conclusion was "well, just use -i" (because then $HOME would be set
correctly). Does this mean that su and sudo behaves differently in
Emacs in this area? Let's see...
sudo -i:
root@sandy:~# echo $HOME
/root
(user-real-login-name)
"root"
sudo bash:
root@sandy:~# echo $HOME
/home/larsi
(user-real-login-name)
"root"
[larsi@stories ~]$ su
Password:
root@stories:/home/larsi# echo $HOME
/root
(user-real-login-name)
"root"
Uhm...
So when I su on this machine, I'm not getting /home/larsi/.emacs?
This is kinda confusing.
--
(domestic pets only, the antidote for overdose, milk.)
bloggy blog: http://lars.ingebrigtsen.no
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Subject: bug#36583: 26.1; emacs 26 tries loading original user's .emacs after su to root
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From: Stefan Monnier <monnier@HIDDEN>
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<jwvbly0yzbl.fsf-monnier+emacs@HIDDEN> <83wogn3ghs.fsf@HIDDEN>
Date: Fri, 12 Jul 2019 10:46:13 -0400
In-Reply-To: <83wogn3ghs.fsf@HIDDEN> (Eli Zaretskii's message of "Fri, 12 Jul
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>> > This is explicitly documented in the manual.
>> > "How Emacs Finds Your Init File".
>> FWIW, I find this behavior very surprising (and dangerous).
> Why is it dangerous?
Because it'll run with full admin privileges the user's ~/.emacs which
was likely not written under the assumption that you have to be very
careful not to mess up the whole system.
Stefan
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Subject: bug#36583: 26.1; emacs 26 tries loading original user's .emacs after su to root
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> From: Stefan Monnier <monnier@HIDDEN>
> Cc: rgm@HIDDEN, sb@HIDDEN, 36583 <at> debbugs.gnu.org
> Date: Fri, 12 Jul 2019 10:46:13 -0400
>
> >> > This is explicitly documented in the manual.
> >> > "How Emacs Finds Your Init File".
> >> FWIW, I find this behavior very surprising (and dangerous).
> > Why is it dangerous?
>
> Because it'll run with full admin privileges the user's ~/.emacs which
> was likely not written under the assumption that you have to be very
> careful not to mess up the whole system.
Isn't that what 'su' is supposed to allow?
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Subject: bug#36583: 26.1; emacs 26 tries loading original user's .emacs after su to root
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Content preview: Eli Zaretskii <eliz@HIDDEN> writes: >> Because it'll run
with full admin privileges the user's ~/.emacs which >> was likely not written
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whole system. > > Isn't [...]
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Eli Zaretskii <eliz@HIDDEN> writes:
>> Because it'll run with full admin privileges the user's ~/.emacs which
>> was likely not written under the assumption that you have to be very
>> careful not to mess up the whole system.
>
> Isn't that what 'su' is supposed to allow?
Under su you can run any command -- that's true.
But it's unexpected to have a program run this code as root. At least,
it's not what I would expect, and I have not written the code in
/home/larsi/.emacs under the assumption that is has to be safe for root
to run.
--
(domestic pets only, the antidote for overdose, milk.)
bloggy blog: http://lars.ingebrigtsen.no
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Subject: bug#36583: 26.1; emacs 26 tries loading original user's .emacs after su to root
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[[[ To any NSA and FBI agents reading my email: please consider ]]]
[[[ whether defending the US Constitution against all enemies, ]]]
[[[ foreign or domestic, requires you to follow Snowden's example. ]]]
I think I asked for this feature so that when I run Emacs as root I
will get the commands I am accustomed to.
--
Dr Richard Stallman
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Subject: bug#36583: 26.1; emacs 26 tries loading original user's .emacs after su to root
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Date: Sat, 13 Jul 2019 11:21:29 +0200
In-Reply-To: <E1hm58n-0003kd-LO@HIDDEN> (Richard Stallman's message
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On Jul 12 2019, Richard Stallman <rms@HIDDEN> wrote:
> I think I asked for this feature so that when I run Emacs as root I
> will get the commands I am accustomed to.
Nowadays this is perhaps obsoleted by Tramp.
Andreas.
--
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X-Loop: help-debbugs@HIDDEN
Subject: bug#36583: 26.1; emacs 26 tries loading original user's .emacs after su to root
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From: Stefan Kangas <stefan@HIDDEN>
Date: Sat, 13 Jul 2019 11:34:24 +0200
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Andreas Schwab <schwab@HIDDEN> writes:
> On Jul 12 2019, Richard Stallman <rms@HIDDEN> wrote:
>
> > I think I asked for this feature so that when I run Emacs as root I
> > will get the commands I am accustomed to.
>
> Nowadays this is perhaps obsoleted by Tramp.
Tramp covers this use case for me at least.
FWIW, I think we should remove this feature. It has always surprised me since
it's so different from how other programs on GNU/Linux usually behaves.
Would it be a good idea to also add something to the FAQ or Manual on the
recommended way to edit files as root (which perhaps should be: use Tramp)?
Thanks,
Stefan Kangas
X-Loop: help-debbugs@HIDDEN
Subject: bug#36583: 26.1; emacs 26 tries loading original user's .emacs after su to root
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Date: Sat, 13 Jul 2019 09:09:55 -0400
In-Reply-To: <E1hm58n-0003kd-LO@HIDDEN> (Richard Stallman's message
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> I think I asked for this feature so that when I run Emacs as root I
> will get the commands I am accustomed to.
I can see why you'd like that, but I think this should be the result of
an explicit choice rather than the default behavior.
Stefan
X-Loop: help-debbugs@HIDDEN
Subject: bug#36583: 26.1; emacs 26 tries loading original user's .emacs after su to root
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> > I think I asked for this feature so that when I run Emacs as root I
> > will get the commands I am accustomed to.
> Nowadays this is perhaps obsoleted by Tramp.
Sorry, I don't follow you. I don't see how there is any relationship
between this .emacs veature and Tramp.
--
Dr Richard Stallman
President, Free Software Foundation (https://gnu.org, https://fsf.org)
Internet Hall-of-Famer (https://internethalloffame.org)
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Subject: bug#36583: 26.1; emacs 26 tries loading original user's .emacs after su to root
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[[[ To any NSA and FBI agents reading my email: please consider ]]]
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> I can see why you'd like that, but I think this should be the result of
> an explicit choice rather than the default behavior.
How do you suggest a user indicate that choice?
--
Dr Richard Stallman
President, Free Software Foundation (https://gnu.org, https://fsf.org)
Internet Hall-of-Famer (https://internethalloffame.org)
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Subject: bug#36583: 26.1; emacs 26 tries loading original user's .emacs after su to root
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On Jul 13 2019, Richard Stallman <rms@HIDDEN> wrote:
> Sorry, I don't follow you. I don't see how there is any relationship
> between this .emacs veature and Tramp.
Tramp implements su in emacs.
Andreas.
--
Andreas Schwab, schwab@HIDDEN
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"And now for something completely different."
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Subject: bug#36583: 26.1; emacs 26 tries loading original user's .emacs after su to root
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> > I can see why you'd like that, but I think this should be the result of
> > an explicit choice rather than the default behavior.
>
> How do you suggest a user indicate that choice?
Don't know. How 'bout let the /root/.emacs file do something like:
(load (concat "~" (user-login-name) "/.emacs"))
?
For convenience, we could provide an ad-hoc function that would do that
"right" (i.e. looking for .emacs, .emacs.d/init.el, and things like
that). We could even put it in /root/.emacs.d/early-init.el.
Stefan
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Subject: bug#36583: 26.1; emacs 26 tries loading original user's .emacs after su to root
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Stefan Monnier <monnier@HIDDEN> writes:
> How 'bout let the /root/.emacs file do something like:
>
> (load (concat "~" (user-login-name) "/.emacs"))
>
> ?
> For convenience, we could provide an ad-hoc function that would do that
> "right" (i.e. looking for .emacs, .emacs.d/init.el, and things like
> that). We could even put it in /root/.emacs.d/early-init.el.
Wouldn't it be simpler to do this in the shell, e.g.,
cat >>/root/.bashrc <<'EOF'
alias emacs='emacs -u "$LOGNAME"'
EOF
although I would personally suggest
cat >>/root/.bashrc <<'EOF'
alias emacs='echo Do not run emacs as root'
EOF
X-Loop: help-debbugs@HIDDEN
Subject: bug#36583: 26.1; emacs 26 tries loading original user's .emacs after su to root
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> Wouldn't it be simpler to do this in the shell, e.g.,
>
> cat >>/root/.bashrc <<'EOF'
> alias emacs='emacs -u "$LOGNAME"'
> EOF
>
> although I would personally suggest
>
> cat >>/root/.bashrc <<'EOF'
> alias emacs='echo Do not run emacs as root'
> EOF
Yes, there are various ways to skin this cat.
Stefan
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Subject: bug#36583: 26.1; emacs 26 tries loading original user's .emacs after su to root
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>>>>> Richard Stallman <rms@HIDDEN>:
> I think I asked for this feature so that when I run Emacs as root I
> will get the commands I am accustomed to.
FWIW What broke things for me, was that it reads the .emacs file from
/home/sb directory, but it doesn't read /home/sb/.emacs.d/elpa/ and
therefore doesn't find the packages my .emacs refers to, so that startup
breaks in the middle of the setup and nothing works as expected.
If it had used my regular config fully, I never would have noticed.
The root user has a functional .emacs, but a much slimmer one. I've
basically customized away the behaviour I dislike. Either .emacs
(ie. /home/sb/.emacs or /root/.emacs) would have worked for me if they
could have run without failing.
(PS sorry for coming late to the discussion I originated. My incoming email
broke as a result of an openssl change in a debian version upgrade and I
haven't received email since July 11 until today, and didn't receive the
initial debbug response. And sorry if I came through as rude on emacs-help)
X-Loop: help-debbugs@HIDDEN
Subject: bug#36583: 26.1; emacs 26 tries loading original user's .emacs after su to root
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> FWIW What broke things for me, was that it reads the .emacs file from
> /home/sb directory, but it doesn't read /home/sb/.emacs.d/elpa/ and
> therefore doesn't find the packages my .emacs refers to, so that startup
> breaks in the middle of the setup and nothing works as expected.
Indeed, as a first-approximation, it uses "~$LOGNAME/.emacs" but "$HOME/.emacs.d/elpa/".
In many circumstances "~$LOGNAME/" is the same as "$HOME/", and in yet
other circumstances Emacs uses "$HOME/.emacs" (which I find very handy)
rather than "~$LOGNAME/.emacs".
I'd rather we drop this special case of using "~$LOGNAME/.emacs" when we
decide that we're in "su". I know it's long standing behavior, but
there are many other ways for the user to get the same result, so
I think we can get rid of this dangerous quirk.
Stefan
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Subject: bug#36583: 26.1; emacs 26 tries loading original user's .emacs after su to root
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Another breakage discovered today: it's impossible to do X forwarding
with an unbroken emacs configuration.
If you do:
- ssh -Y someserver
- /bin/su - root
then the DISPLAY variable set by "ssh -Y" is lost and it's impossible to
do X forwarding.
Doing just "/bin/su" (which I used to do before the last debian upgrade)
gives me a broken emacs configuration (because ~sb/.emacs is used but
ELPA packages under ~sb/.emacs.d/ are not used).
(And as Lars has pointed out elsewhere in this thread: the emacs
configuration of root should be tighter and more security conscious than
the configuration of a regular user. So just including the .emacs.d/ of
the original user may not be the appropriate fix)
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