On 11/26/19 1:27 PM, Xi Ruoyao wrote:
On 2019-11-26 12:54 -0600, Bruce Dubbs wrote:
On 11/26/19 9:30 AM, Xi Ruoyao wrote:
But on Arch (and some other distributions) non-login bash loads
/etc/bash.bashrc before .bashrc. The environments in bash.bashrc
may
pollute the LFS building environment. For example, on Arch, our
$PS1
(set in .bash_profile, should be '\u:\w\$ ') would be overwritten
(become `[\u@\h \W]\$ ').
With the exception of PS1, is there anything else in
/etc/bash.bashrc
that interferes with the lfs user's environment? We could easily
fix
the PS1 issue by adding
PS1='\u:\w\$ '
to our .bashrc.
On Arch Linux it also sets $PROMPT_COMMAND, and then sources
/usr/share/bash_completion/bash_completion (!).
We could also add a note for the user to check the contents of
/etc/bash.bashrc and, if needed, move it out of the way.
Also, I wonder if using
exec env -i HOME=$HOME TERM=$TERM PS1='\u:\w\$ ' /bin/bash --rcfile
~/.bashrc
would disable sourcing /etc/bash.bashrc.
No. I tried that.
I found a solution with Google:
/home/lfs/.bash_profile:
exec env -i ENV=$HOME/.bashrc \
HOME=$HOME TERM=$TERM PS1='\u:\w\$ ' /bin/bash --posix
/home/lfs/.bashrc:
set +o posix
set +h
umask 022
# .... (same as LFS book)
"--posix" will start POSIX mode and disable rc file loading. Then we
use "ENV=$HOME/.bashrc" to tell bash to load our .bashrc file. At last
use "set +o posix" in .bashrc to exit POSIX mode.
That looks good. I don't have a system that uses /etc/bash.bashrc so I
can't test it. If you say it works for you, I'll add it.
--------
Also, I am running into an issue I haven't noticed before. On my
existing system if I try to log in as user lfs with .bash_profile set,
it automatically starts bash and then puts it into the background.
# su - lfs
[1]+ Stopped su - lfs
# jobs
[1]+ Stopped su - lfs
# fg
su - lfs
lfs:~$
The rules in the book work OK as .bash_profile is not present when we
initially change to user lfs and then we source .bash_profile. That works.
It could have something to do with PAM and su, but I'm not sure. Has
anyone else seen this?
-- Bruce
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