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Re: Use of --rcfile does not preclude read of /etc/bash.bashrc

From: Eduardo Bustamante
Subject: Re: Use of --rcfile does not preclude read of /etc/bash.bashrc
Date: Tue, 2 Jan 2018 17:39:42 -0800

On Tue, Jan 2, 2018 at 3:05 PM, Nat! <address@hidden> wrote:
> Description:
>     The documentation states, that /etc/bash.bashrc should not be read
> (rightfully so IMO) with
>     --rcfile.

FWIW, there are two things going on here:

(1) /etc/bash.bashrc is actually disabled by default in the upstream
bash source code distribution and it's not documented:

$ grep SYS_BASHRC config-top.h
/* #define SYS_BASHRC "/etc/bash.bashrc" */

(2) The behavior you observe (SYS_BASHRC and bashrc_file both being
sourced) has been in place for a few years now (since bash 2.05 at
least), so I don't think it's a good idea to change this now in
upstream code, given that it'll potentially affect users that rely on
this to behave in a certain way for distros that enable SYS_BASHRC.

$ git blame shell.c | sed -n '1187,1198p'
ccc6cda31 (Jari Aalto 1996-12-23 17:02:34 +0000 1187)       /* bash */
ccc6cda31 (Jari Aalto 1996-12-23 17:02:34 +0000 1188)       if
(act_like_sh == 0 && no_rc == 0)
ccc6cda31 (Jari Aalto 1996-12-23 17:02:34 +0000 1189) {
ccc6cda31 (Jari Aalto 1996-12-23 17:02:34 +0000 1190) #ifdef SYS_BASHRC
b72432fdc (Jari Aalto 1999-02-19 17:11:39 +0000 1191) #  if defined (__OPENNT)
b72432fdc (Jari Aalto 1999-02-19 17:11:39 +0000 1192)
maybe_execute_file (_prefixInstallPath(SYS_BASHRC, NULL, 0), 1);
b72432fdc (Jari Aalto 1999-02-19 17:11:39 +0000 1193) #  else
ccc6cda31 (Jari Aalto 1996-12-23 17:02:34 +0000 1194)
maybe_execute_file (SYS_BASHRC, 1);
bb70624e9 (Jari Aalto 2000-03-17 21:46:59 +0000 1195) #  endif
ccc6cda31 (Jari Aalto 1996-12-23 17:02:34 +0000 1196) #endif
28ef6c316 (Jari Aalto 2001-04-06 19:14:31 +0000 1197)
maybe_execute_file (bashrc_file, 1);
^726f6388 (Jari Aalto 1996-08-26 18:22:31 +0000 1198) }

As you can see, the wording that you report is not present in the
upstream distribution, so this is likely a debian patch.

$ PAGER= man doc/bash.1 | grep -e '^[[:space:]]*--rcfile file' -A3
       --rcfile file
              Execute  commands  from file instead of the standard
personal initialization file ~/.bashrc if the shell is interacā€
              tive (see INVOCATION below).

IMO, the right thing to do here would be to ask the Debian package
maintainer to correct the wording to indicate that both
/etc/bash.bashrc AND the file provided by --bashrc are executed.
Important to note here also that SYS_BASHRC is a mechanism exposed for
sysadmins who want to ensure that a certain configuration is applied
system-wide, regardless of what the users of the system desire. If
it's a system you control, you can always re-compile bash or remove
the file.

See: https://lists.gnu.org/archive/html/bug-bash/2009-05/msg00035.html
and https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=516152 for prior

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