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Subject: bug#19477: 24.4; Init script from su terminal
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From: ibeas@HIDDEN (=?UTF-8?Q?=C3=81lvar?= Ibeas)
Date: Wed, 31 Dec 2014 17:36:58 +0100
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Hello,

Working under Debian, when I switch to root using `su', Emacs doesn't
load the init script located in my user's home folder, as the manual
says:

``if you run Emacs from a shell started by `su', Emacs tries to find
your own `.emacs', not that of the user you are currently pretending
to be [...] It gets your user name from the environment variables
`LOGNAME' and `USER'.''

The variables LOGNAME and USER have both the value `root'. The command
`logname' returns instead my own user name.

Is this an Emacs bug?

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To: ibeas@HIDDEN (=?UTF-8?Q?=C3=81lvar?= Ibeas)
Subject: bug#19477: Acknowledgement (24.4; Init script from su terminal)
Message-ID: <handler.19477.B.1420043831339.ack <at> debbugs.gnu.org>
References: <87iogrixn9.fsf@HIDDEN>
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Date: Wed, 31 Dec 2014 16:38:02 +0000

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19477: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=3D19477
GNU Bug Tracking System
Contact help-debbugs@HIDDEN with problems

Message sent to bug-gnu-emacs@HIDDEN:

Subject: bug#19477: 24.4; Init script from su terminal
Resent-From: Glenn Morris <rgm@HIDDEN>
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Cc: 19477 <at> debbugs.gnu.org
From: Glenn Morris <rgm@HIDDEN>
References: <87iogrixn9.fsf@HIDDEN>
Date: Wed, 31 Dec 2014 13:36:26 -0500
In-Reply-To: <87iogrixn9.fsf@HIDDEN> ("=?UTF-8?Q?=C3=81lvar?= Ibeas"'s
 message of "Wed, 31 Dec 2014 17:36:58 +0100")
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=C3=81lvar Ibeas wrote:

> ``if you run Emacs from a shell started by `su', Emacs tries to find
> your own `.emacs', not that of the user you are currently pretending
> to be [...] It gets your user name from the environment variables
> `LOGNAME' and `USER'.''
>
> The variables LOGNAME and USER have both the value `root'. The command
> `logname' returns instead my own user name.

Emacs is behaving as documented.

The `su' programs from coreutils (it's since been removed in favour of
the util-linux one) and util-linux (as used by eg Red Hat) do not change
LOGNAME or USER when su'ing to root.

It seems that Debian's `su' comes from the `shadow' package and does
change them.

But all the `su' programs are behaving as documented too.
It's a shame they don't agree with each other...

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To: ibeas@HIDDEN (=?UTF-8?Q?=C3=81lvar?= Ibeas)
Subject: bug#19477: closed (24.4; Init script from su terminal)
CC: tracker <at> debbugs.gnu.org
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Date: Wed, 31 Dec 2014 19:35:01 +0000
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Your message dated Wed, 31 Dec 2014 20:34:13 +0100
with message-id <87mw638vgq.fsf_-_@HIDDEN>
and subject line 24.4; Init script from su terminal
has caused the debbugs.gnu.org bug report #19477,
regarding 24.4; Init script from su terminal
to be marked as done.

(If you believe you have received this mail in error, please contact
help-debbugs@HIDDEN)


--=20
19477: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=3D19477
GNU Bug Tracking System
Contact help-debbugs@HIDDEN with problems

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Subject: 24.4; Init script from su terminal
Date: Wed, 31 Dec 2014 17:36:58 +0100
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Hello,

Working under Debian, when I switch to root using `su', Emacs doesn't
load the init script located in my user's home folder, as the manual
says:

``if you run Emacs from a shell started by `su', Emacs tries to find
your own `.emacs', not that of the user you are currently pretending
to be [...] It gets your user name from the environment variables
`LOGNAME' and `USER'.''

The variables LOGNAME and USER have both the value `root'. The command
`logname' returns instead my own user name.

Is this an Emacs bug?




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From: ibeas@HIDDEN (=?utf-8?Q?=C3=81lvar?= Ibeas)
To: 19477-done <at> debbugs.gnu.org
Subject: 24.4; Init script from su terminal
References: <87iogrixn9.fsf@HIDDEN>
 <mailman.17015.1420051024.1147.bug-gnu-emacs@HIDDEN>
Date: Wed, 31 Dec 2014 20:34:13 +0100
In-Reply-To: <mailman.17015.1420051024.1147.bug-gnu-emacs@HIDDEN> (Glenn
 Morris's message of "Wed, 31 Dec 2014 13:36:26 -0500")
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Glenn Morris <rgm@HIDDEN> writes:

> Emacs is behaving as documented.
>
> The `su' programs from coreutils (it's since been removed in favour of
> the util-linux one) and util-linux (as used by eg Red Hat) do not change
> LOGNAME or USER when su'ing to root.
>
> It seems that Debian's `su' comes from the `shadow' package and does
> change them.

Thanks for replying. I see now that most of the environment variables
are kept with the `-p' option.


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To: ibeas@HIDDEN (=?UTF-8?Q?=C3=81lvar?= Ibeas)
Subject: bug#19477: closed (24.4; Init script from su terminal)
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Your bug report

#19477: 24.4; Init script from su terminal

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 19477 <at> debbugs.gnu.org.

--=20
19477: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=3D19477
GNU Bug Tracking System
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Subject: 24.4; Init script from su terminal
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 <mailman.17015.1420051024.1147.bug-gnu-emacs@HIDDEN>
Date: Wed, 31 Dec 2014 20:34:13 +0100
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Glenn Morris <rgm@HIDDEN> writes:

> Emacs is behaving as documented.
>
> The `su' programs from coreutils (it's since been removed in favour of
> the util-linux one) and util-linux (as used by eg Red Hat) do not change
> LOGNAME or USER when su'ing to root.
>
> It seems that Debian's `su' comes from the `shadow' package and does
> change them.

Thanks for replying. I see now that most of the environment variables
are kept with the `-p' option.


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From: ibeas@HIDDEN (=?utf-8?Q?=C3=81lvar?= Ibeas)
To: bug-gnu-emacs@HIDDEN
Subject: 24.4; Init script from su terminal
Date: Wed, 31 Dec 2014 17:36:58 +0100
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Hello,

Working under Debian, when I switch to root using `su', Emacs doesn't
load the init script located in my user's home folder, as the manual
says:

``if you run Emacs from a shell started by `su', Emacs tries to find
your own `.emacs', not that of the user you are currently pretending
to be [...] It gets your user name from the environment variables
`LOGNAME' and `USER'.''

The variables LOGNAME and USER have both the value `root'. The command
`logname' returns instead my own user name.

Is this an Emacs bug?




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I'm not sure this should be closed.
Perhaps there is a better way for Emacs to do what it wants
(get the name under which you logged in) than consulting LOGNAME.
Eg it could do what `logname' the program does.
Although reading the info page for that, what it does (check
/var/run/utmp etc) doesn't seem that great, or portable.

I'm not sure that what Debian's su does is "correct", but I could not
find a standard for su. In any case, this seems like one of those things
that is impossible to ever get changed, because people come to rely on
it behaving the way it does.

In any case, I think the Emacs documentation could stand to be tweaked a
bit. Eg util-linux/coreutils su only leaves LOGNAME alone if you change
to root, not if you change to a non-root user.

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notfixed 19477 24.4
reopen 19477
severity 19477 minor

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notfixed 19477 24.4
reopen 19477
severity 19477 minor

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