Re: Introduction to Xorg-7: XORG_PREFIX & XORG_CONFIG Weird Issue

On 8/14/25 8:40 PM, azazel xes ([email protected] via blfs-support Mailing List) 
wrote:
> 
> 
> /_
> _/
> 
> 
> -------------------------------------------------------------------------------------
> *From:* [email protected] <blfs-support- 
> [email protected]> on behalf of Bruce Dubbs <blfs- 
> [email protected]>
> *Sent:* Thursday, August 14, 2025 5:53 PM
> *To:* [email protected] <[email protected]>
> *Subject:* Re: [blfs-support] Introduction to Xorg-7: XORG_PREFIX & XORG_CONFIG Weird 
> Issue
> On 8/14/25 6:36 PM, azazel xes ([email protected] via blfs-support Mailing List)
> wrote:
>  > Hi,
>  >
>  > When following instructions to choose the installation prefix that in my case i
>  > decided to with /usr, I was never able to pass the value of  $XORG_PREFIX to 
> $XORG_CONFIG
>  >
>  > I followed the instructions, double checked that echo $XORG_PREFIX will print /usr
>  > with a no-root and a root user which was successful in both cases, but when
>  > copypasting (with the root user):
>  >
>  > export XORG_CONFIG="--prefix=$XORG_PREFIX --sysconfdir=/etc \
>  >      --localstatedir=/var --disable-static"
>  > If i echo  $XORG_CONFIG  with the root user or a no-root user the output will always
>  > be an empty value for the --prefix:
>  >
>  > echo $XORG_CONFIG="--prefix= --sysconfdir=/etc  --localstatedir=/var --disable-static"
>  > So creating the /etc/profile.d/xorg.sh was not possible neither because the file will
>  > always be created with a blank value for XORG_CONFIG, I'm not using zsh as my
>  > terminal and i also try removing the backslash in front of the dollar sign which was
>  > unsuccessful too, so I decided to hard code the value /usr to the XORG_CONFIG in /
>  > etc/profile.d/xorg.sh
>  >
>  > Will there be any particular reason for this weird behavior? is it bad that I hard
>  > coded the prefix value to /usr ?
>  >
>>Why are you doing a copy/paste as root?  We assume that users will use sudo from the
>>non-root user and configure sudo with:
>  >
>>cat > /etc/sudoers.d/xorg << EOF
>>>Defaults env_keep += XORG_PREFIX
>>Defaults env_keep += XORG_CONFIG
>  >EOF
>  >
>  >Alternatively you can run sudo as 'sudo -E'.

> Sorry, maybe I didn't explain my self in the best way, so yeah I did try sudo -E, 
> sudo su, etc. and follow the instructions as per the book instructed, I even went 
> back to LFS book Sudo section to check that I hadn't missed something, but the result 
> was always the same $XORG_PREFIX will not be passed to $XORG_CONFIG even is echo 
> $XORG_PREFIX will always echo /usr.
> 
> Maybe is just something weird on my end, the only thing that I forgot to mention is 
> that I updated sudo from Sudo-1.9.16p2 to Sudo 1.9.17p1 before starting  chapter 24. 
> Graphical Environments not sure if this can be or not relevant to this weird behavior.

Well this is what I have:

$ sudo --version
Sudo version 1.9.17p2
Sudoers policy plugin version 1.9.17p2
Sudoers file grammar version 50
Sudoers I/O plugin version 1.9.17p2
Sudoers audit plugin version 1.9.17p2

$ set|grep ^X
XDG_CONFIG_DIRS=/etc/xdg:/opt/kf6/etc/xdg
XDG_DATA_DIRS=/usr/share:/opt/kf6/share
XDG_RUNTIME_DIR=/run/user/1000
XORG_CONFIG='--prefix=/opt/xorg --sysconfdir=/etc --localstatedir=/var --disable-static'
XORG_PREFIX=/opt/xorg

$ sudo
# set|grep ^X
XDG_RUNTIME_DIR=/run/user/root
# exit

$ sudo -E
# set|grep ^X
XDG_CONFIG_DIRS=/etc/xdg:/opt/kf6/etc/xdg
XDG_DATA_DIRS=/usr/share:/opt/kf6/share
XDG_RUNTIME_DIR=/run/user/1000
XORG_CONFIG='--prefix=/opt/xorg --sysconfdir=/etc --localstatedir=/var --disable-static'
XORG_PREFIX=/opt/xorg

I'll note that we usually do not need XORG_CONFIG or XORG_PREFIX when we are root. We 
do occasionally use XORG_PREFIX during the install phase.

   -- Bruce

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